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Annotation of src/sys/kern/uipc_socket.c, Revision 1.215

1.215   ! skrll       1: /*     $NetBSD: uipc_socket.c,v 1.214 2013/03/14 19:13:17 gdt Exp $    */
1.64      thorpej     2:
                      3: /*-
1.188     ad          4:  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.188     ad          8:  * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64      thorpej     9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
1.16      cgd        31:
1.1       cgd        32: /*
1.159     ad         33:  * Copyright (c) 2004 The FreeBSD Foundation
                     34:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    35:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
1.85      agc        46:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        47:  *    may be used to endorse or promote products derived from this software
                     48:  *    without specific prior written permission.
                     49:  *
                     50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     60:  * SUCH DAMAGE.
                     61:  *
1.32      fvdl       62:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        63:  */
1.59      lukem      64:
                     65: #include <sys/cdefs.h>
1.215   ! skrll      66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.214 2013/03/14 19:13:17 gdt Exp $");
1.64      thorpej    67:
1.179     christos   68: #include "opt_compat_netbsd.h"
1.64      thorpej    69: #include "opt_sock_counters.h"
                     70: #include "opt_sosend_loan.h"
1.81      martin     71: #include "opt_mbuftrace.h"
1.84      ragge      72: #include "opt_somaxkva.h"
1.167     ad         73: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        74:
1.9       mycroft    75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/proc.h>
                     78: #include <sys/file.h>
1.142     dyoung     79: #include <sys/filedesc.h>
1.173     plunky     80: #include <sys/kmem.h>
1.9       mycroft    81: #include <sys/mbuf.h>
                     82: #include <sys/domain.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/protosw.h>
                     85: #include <sys/socket.h>
                     86: #include <sys/socketvar.h>
1.21      christos   87: #include <sys/signalvar.h>
1.9       mycroft    88: #include <sys/resourcevar.h>
1.174     pooka      89: #include <sys/uidinfo.h>
1.72      jdolecek   90: #include <sys/event.h>
1.89      christos   91: #include <sys/poll.h>
1.118     elad       92: #include <sys/kauth.h>
1.136     ad         93: #include <sys/mutex.h>
                     94: #include <sys/condvar.h>
1.205     bouyer     95: #include <sys/kthread.h>
1.37      thorpej    96:
1.179     christos   97: #ifdef COMPAT_50
                     98: #include <compat/sys/time.h>
1.184     christos   99: #include <compat/sys/socket.h>
1.179     christos  100: #endif
                    101:
1.202     uebayasi  102: #include <uvm/uvm_extern.h>
                    103: #include <uvm/uvm_loan.h>
                    104: #include <uvm/uvm_page.h>
1.64      thorpej   105:
1.77      thorpej   106: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
                    107: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   108:
1.142     dyoung    109: extern const struct fileops socketops;
                    110:
1.54      lukem     111: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    112: int            somaxconn = SOMAXCONN;
1.160     ad        113: kmutex_t       *softnet_lock;
1.49      jonathan  114:
1.64      thorpej   115: #ifdef SOSEND_COUNTERS
                    116: #include <sys/device.h>
                    117:
1.113     thorpej   118: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   119:     NULL, "sosend", "loan big");
1.113     thorpej   120: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   121:     NULL, "sosend", "copy big");
1.113     thorpej   122: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   123:     NULL, "sosend", "copy small");
1.113     thorpej   124: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   125:     NULL, "sosend", "kva limit");
                    126:
                    127: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    128:
1.101     matt      129: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    130: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    131: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    132: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   133: #else
                    134:
                    135: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    136:
                    137: #endif /* SOSEND_COUNTERS */
                    138:
1.167     ad        139: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      140: int sock_loan_thresh = -1;
1.71      thorpej   141: #else
1.121     yamt      142: int sock_loan_thresh = 4096;
1.65      thorpej   143: #endif
1.64      thorpej   144:
1.136     ad        145: static kmutex_t so_pendfree_lock;
1.205     bouyer    146: static struct mbuf *so_pendfree = NULL;
1.64      thorpej   147:
1.84      ragge     148: #ifndef SOMAXKVA
                    149: #define        SOMAXKVA (16 * 1024 * 1024)
                    150: #endif
                    151: int somaxkva = SOMAXKVA;
1.113     thorpej   152: static int socurkva;
1.136     ad        153: static kcondvar_t socurkva_cv;
1.64      thorpej   154:
1.191     elad      155: static kauth_listener_t socket_listener;
                    156:
1.64      thorpej   157: #define        SOCK_LOAN_CHUNK         65536
                    158:
1.205     bouyer    159: static void sopendfree_thread(void *);
                    160: static kcondvar_t pendfree_thread_cv;
                    161: static lwp_t *sopendfree_lwp;
1.93      yamt      162:
1.212     pooka     163: static void sysctl_kern_socket_setup(void);
1.178     pooka     164: static struct sysctllog *socket_sysctllog;
                    165:
1.113     thorpej   166: static vsize_t
1.129     yamt      167: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      168: {
1.98      christos  169:        int error;
1.80      yamt      170:
1.136     ad        171:        mutex_enter(&so_pendfree_lock);
1.80      yamt      172:        while (socurkva + len > somaxkva) {
                    173:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        174:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  175:                if (error) {
                    176:                        len = 0;
                    177:                        break;
                    178:                }
1.80      yamt      179:        }
1.93      yamt      180:        socurkva += len;
1.136     ad        181:        mutex_exit(&so_pendfree_lock);
1.98      christos  182:        return len;
1.95      yamt      183: }
                    184:
1.113     thorpej   185: static void
1.95      yamt      186: sokvaunreserve(vsize_t len)
                    187: {
                    188:
1.136     ad        189:        mutex_enter(&so_pendfree_lock);
1.95      yamt      190:        socurkva -= len;
1.136     ad        191:        cv_broadcast(&socurkva_cv);
                    192:        mutex_exit(&so_pendfree_lock);
1.95      yamt      193: }
                    194:
                    195: /*
                    196:  * sokvaalloc: allocate kva for loan.
                    197:  */
                    198:
                    199: vaddr_t
1.209     matt      200: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95      yamt      201: {
                    202:        vaddr_t lva;
                    203:
                    204:        /*
                    205:         * reserve kva.
                    206:         */
                    207:
1.98      christos  208:        if (sokvareserve(so, len) == 0)
                    209:                return 0;
1.93      yamt      210:
                    211:        /*
                    212:         * allocate kva.
                    213:         */
1.80      yamt      214:
1.209     matt      215:        lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
                    216:            UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      217:        if (lva == 0) {
                    218:                sokvaunreserve(len);
1.80      yamt      219:                return (0);
1.95      yamt      220:        }
1.80      yamt      221:
                    222:        return lva;
                    223: }
                    224:
1.93      yamt      225: /*
                    226:  * sokvafree: free kva for loan.
                    227:  */
                    228:
1.80      yamt      229: void
                    230: sokvafree(vaddr_t sva, vsize_t len)
                    231: {
1.93      yamt      232:
                    233:        /*
                    234:         * free kva.
                    235:         */
1.80      yamt      236:
1.109     yamt      237:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      238:
                    239:        /*
                    240:         * unreserve kva.
                    241:         */
                    242:
1.95      yamt      243:        sokvaunreserve(len);
1.80      yamt      244: }
                    245:
1.64      thorpej   246: static void
1.134     christos  247: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   248: {
1.156     yamt      249:        vaddr_t sva, eva;
1.64      thorpej   250:        vsize_t len;
1.156     yamt      251:        int npgs;
                    252:
                    253:        KASSERT(pgs != NULL);
1.64      thorpej   254:
                    255:        eva = round_page((vaddr_t) buf + size);
                    256:        sva = trunc_page((vaddr_t) buf);
                    257:        len = eva - sva;
                    258:        npgs = len >> PAGE_SHIFT;
                    259:
                    260:        pmap_kremove(sva, len);
                    261:        pmap_update(pmap_kernel());
                    262:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      263:        sokvafree(sva, len);
1.64      thorpej   264: }
                    265:
1.93      yamt      266: /*
1.205     bouyer    267:  * sopendfree_thread: free mbufs on "pendfree" list.
1.136     ad        268:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      269:  */
                    270:
1.205     bouyer    271: static void
                    272: sopendfree_thread(void *v)
1.93      yamt      273: {
1.137     ad        274:        struct mbuf *m, *next;
1.205     bouyer    275:        size_t rv;
1.93      yamt      276:
1.205     bouyer    277:        mutex_enter(&so_pendfree_lock);
1.64      thorpej   278:
1.205     bouyer    279:        for (;;) {
                    280:                rv = 0;
                    281:                while (so_pendfree != NULL) {
                    282:                        m = so_pendfree;
                    283:                        so_pendfree = NULL;
                    284:                        mutex_exit(&so_pendfree_lock);
                    285:
                    286:                        for (; m != NULL; m = next) {
                    287:                                next = m->m_next;
                    288:                                KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    289:                                KASSERT(m->m_ext.ext_refcnt == 0);
                    290:
                    291:                                rv += m->m_ext.ext_size;
                    292:                                sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
                    293:                                    m->m_ext.ext_size);
                    294:                                pool_cache_put(mb_cache, m);
                    295:                        }
1.93      yamt      296:
1.205     bouyer    297:                        mutex_enter(&so_pendfree_lock);
1.93      yamt      298:                }
1.205     bouyer    299:                if (rv)
                    300:                        cv_broadcast(&socurkva_cv);
                    301:                cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64      thorpej   302:        }
1.205     bouyer    303:        panic("sopendfree_thread");
                    304:        /* NOTREACHED */
1.64      thorpej   305: }
                    306:
1.80      yamt      307: void
1.134     christos  308: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   309: {
                    310:
1.156     yamt      311:        KASSERT(m != NULL);
1.64      thorpej   312:
1.93      yamt      313:        /*
                    314:         * postpone freeing mbuf.
                    315:         *
                    316:         * we can't do it in interrupt context
                    317:         * because we need to put kva back to kernel_map.
                    318:         */
                    319:
1.136     ad        320:        mutex_enter(&so_pendfree_lock);
1.92      yamt      321:        m->m_next = so_pendfree;
                    322:        so_pendfree = m;
1.205     bouyer    323:        cv_signal(&pendfree_thread_cv);
1.136     ad        324:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   325: }
                    326:
                    327: static long
                    328: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    329: {
                    330:        struct iovec *iov = uio->uio_iov;
                    331:        vaddr_t sva, eva;
                    332:        vsize_t len;
1.156     yamt      333:        vaddr_t lva;
                    334:        int npgs, error;
                    335:        vaddr_t va;
                    336:        int i;
1.64      thorpej   337:
1.116     yamt      338:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   339:                return (0);
                    340:
                    341:        if (iov->iov_len < (size_t) space)
                    342:                space = iov->iov_len;
                    343:        if (space > SOCK_LOAN_CHUNK)
                    344:                space = SOCK_LOAN_CHUNK;
                    345:
                    346:        eva = round_page((vaddr_t) iov->iov_base + space);
                    347:        sva = trunc_page((vaddr_t) iov->iov_base);
                    348:        len = eva - sva;
                    349:        npgs = len >> PAGE_SHIFT;
                    350:
1.79      thorpej   351:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    352:
1.209     matt      353:        lva = sokvaalloc(sva, len, so);
1.64      thorpej   354:        if (lva == 0)
1.80      yamt      355:                return 0;
1.64      thorpej   356:
1.116     yamt      357:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   358:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   359:        if (error) {
1.80      yamt      360:                sokvafree(lva, len);
1.64      thorpej   361:                return (0);
                    362:        }
                    363:
                    364:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   365:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    366:                    VM_PROT_READ, 0);
1.64      thorpej   367:        pmap_update(pmap_kernel());
                    368:
                    369:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    370:
1.134     christos  371:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   372:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   373:
                    374:        uio->uio_resid -= space;
                    375:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  376:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   377:        uio->uio_iov->iov_len -= space;
                    378:        if (uio->uio_iov->iov_len == 0) {
                    379:                uio->uio_iov++;
                    380:                uio->uio_iovcnt--;
                    381:        }
                    382:
                    383:        return (space);
                    384: }
                    385:
1.142     dyoung    386: struct mbuf *
1.147     dyoung    387: getsombuf(struct socket *so, int type)
1.142     dyoung    388: {
                    389:        struct mbuf *m;
                    390:
1.147     dyoung    391:        m = m_get(M_WAIT, type);
1.142     dyoung    392:        MCLAIM(m, so->so_mowner);
                    393:        return m;
                    394: }
                    395:
1.191     elad      396: static int
                    397: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    398:     void *arg0, void *arg1, void *arg2, void *arg3)
                    399: {
                    400:        int result;
                    401:        enum kauth_network_req req;
                    402:
                    403:        result = KAUTH_RESULT_DEFER;
                    404:        req = (enum kauth_network_req)arg0;
                    405:
1.193     elad      406:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    407:            (action != KAUTH_NETWORK_BIND))
1.191     elad      408:                return result;
                    409:
                    410:        switch (req) {
1.193     elad      411:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    412:                result = KAUTH_RESULT_ALLOW;
                    413:                break;
                    414:
1.191     elad      415:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    416:                /* Normal users can only drop their own connections. */
                    417:                struct socket *so = (struct socket *)arg1;
                    418:
1.199     elad      419:                if (proc_uidmatch(cred, so->so_cred))
1.191     elad      420:                        result = KAUTH_RESULT_ALLOW;
                    421:
                    422:                break;
                    423:                }
                    424:
                    425:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    426:                /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203     matt      427:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
                    428:                    || (u_long)arg1 == PF_BLUETOOTH) {
1.191     elad      429:                        result = KAUTH_RESULT_ALLOW;
1.203     matt      430:                } else {
1.191     elad      431:                        /* Privileged, let secmodel handle this. */
                    432:                        if ((u_long)arg2 == SOCK_RAW)
                    433:                                break;
                    434:                }
                    435:
                    436:                result = KAUTH_RESULT_ALLOW;
                    437:
                    438:                break;
                    439:
1.192     elad      440:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    441:                result = KAUTH_RESULT_ALLOW;
                    442:
                    443:                break;
                    444:
1.191     elad      445:        default:
                    446:                break;
                    447:        }
                    448:
                    449:        return result;
                    450: }
                    451:
1.119     yamt      452: void
                    453: soinit(void)
                    454: {
                    455:
1.212     pooka     456:        sysctl_kern_socket_setup();
1.178     pooka     457:
1.148     ad        458:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        459:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        460:        cv_init(&socurkva_cv, "sokva");
1.205     bouyer    461:        cv_init(&pendfree_thread_cv, "sopendfr");
1.166     ad        462:        soinit2();
1.136     ad        463:
1.119     yamt      464:        /* Set the initial adjusted socket buffer size. */
                    465:        if (sb_max_set(sb_max))
                    466:                panic("bad initial sb_max value: %lu", sb_max);
                    467:
1.191     elad      468:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    469:            socket_listener_cb, NULL);
1.119     yamt      470: }
                    471:
1.205     bouyer    472: void
                    473: soinit1(void)
                    474: {
                    475:        int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
                    476:            sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
                    477:        if (error)
                    478:                panic("soinit1 %d", error);
                    479: }
                    480:
1.1       cgd       481: /*
                    482:  * Socket operation routines.
                    483:  * These routines are called by the routines in
                    484:  * sys_socket.c or from a system process, and
                    485:  * implement the semantics of socket operations by
                    486:  * switching out to the protocol specific routines.
                    487:  */
                    488: /*ARGSUSED*/
1.3       andrew    489: int
1.160     ad        490: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    491:         struct socket *lockso)
1.1       cgd       492: {
1.99      matt      493:        const struct protosw    *prp;
1.54      lukem     494:        struct socket   *so;
1.115     yamt      495:        uid_t           uid;
1.160     ad        496:        int             error;
                    497:        kmutex_t        *lock;
1.1       cgd       498:
1.132     elad      499:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    500:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    501:            KAUTH_ARG(proto));
1.140     dyoung    502:        if (error != 0)
                    503:                return error;
1.127     elad      504:
1.1       cgd       505:        if (proto)
                    506:                prp = pffindproto(dom, proto, type);
                    507:        else
                    508:                prp = pffindtype(dom, type);
1.140     dyoung    509:        if (prp == NULL) {
1.120     ginsbach  510:                /* no support for domain */
                    511:                if (pffinddomain(dom) == 0)
1.140     dyoung    512:                        return EAFNOSUPPORT;
1.120     ginsbach  513:                /* no support for socket type */
                    514:                if (proto == 0 && type != 0)
1.140     dyoung    515:                        return EPROTOTYPE;
                    516:                return EPROTONOSUPPORT;
1.120     ginsbach  517:        }
1.140     dyoung    518:        if (prp->pr_usrreq == NULL)
                    519:                return EPROTONOSUPPORT;
1.1       cgd       520:        if (prp->pr_type != type)
1.140     dyoung    521:                return EPROTOTYPE;
1.160     ad        522:
                    523:        so = soget(true);
1.1       cgd       524:        so->so_type = type;
                    525:        so->so_proto = prp;
1.33      matt      526:        so->so_send = sosend;
                    527:        so->so_receive = soreceive;
1.78      matt      528: #ifdef MBUFTRACE
                    529:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    530:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    531:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    532: #endif
1.138     rmind     533:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      534:        so->so_uidinfo = uid_find(uid);
1.168     yamt      535:        so->so_cpid = l->l_proc->p_pid;
1.160     ad        536:        if (lockso != NULL) {
                    537:                /* Caller wants us to share a lock. */
                    538:                lock = lockso->so_lock;
                    539:                so->so_lock = lock;
                    540:                mutex_obj_hold(lock);
1.214     gdt       541:                /* XXX Why is this not solock, to match sounlock? */
1.160     ad        542:                mutex_enter(lock);
                    543:        } else {
                    544:                /* Lock assigned and taken during PRU_ATTACH. */
                    545:        }
1.140     dyoung    546:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    547:            (struct mbuf *)(long)proto, NULL, l);
1.160     ad        548:        KASSERT(solocked(so));
1.140     dyoung    549:        if (error != 0) {
1.1       cgd       550:                so->so_state |= SS_NOFDREF;
                    551:                sofree(so);
1.140     dyoung    552:                return error;
1.1       cgd       553:        }
1.198     elad      554:        so->so_cred = kauth_cred_dup(l->l_cred);
1.160     ad        555:        sounlock(so);
1.1       cgd       556:        *aso = so;
1.140     dyoung    557:        return 0;
1.1       cgd       558: }
                    559:
1.142     dyoung    560: /* On success, write file descriptor to fdout and return zero.  On
                    561:  * failure, return non-zero; *fdout will be undefined.
                    562:  */
                    563: int
                    564: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    565:     struct lwp *l, int *fdout)
                    566: {
                    567:        struct socket   *so;
                    568:        struct file     *fp;
                    569:        int             fd, error;
1.204     christos  570:        int             flags = type & SOCK_FLAGS_MASK;
1.142     dyoung    571:
1.204     christos  572:        type &= ~SOCK_FLAGS_MASK;
1.155     ad        573:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204     christos  574:                return error;
                    575:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207     christos  576:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
                    577:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    578:        fp->f_type = DTYPE_SOCKET;
                    579:        fp->f_ops = &socketops;
1.160     ad        580:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    581:        if (error != 0) {
1.155     ad        582:                fd_abort(curproc, fp, fd);
1.142     dyoung    583:        } else {
                    584:                if (sop != NULL)
                    585:                        *sop = so;
                    586:                fp->f_data = so;
1.155     ad        587:                fd_affix(curproc, fp, fd);
1.142     dyoung    588:                *fdout = fd;
1.213     christos  589:                if (flags & SOCK_NONBLOCK)
                    590:                        so->so_state |= SS_NBIO;
1.142     dyoung    591:        }
                    592:        return error;
                    593: }
                    594:
1.3       andrew    595: int
1.190     dyoung    596: sofamily(const struct socket *so)
                    597: {
                    598:        const struct protosw *pr;
                    599:        const struct domain *dom;
                    600:
                    601:        if ((pr = so->so_proto) == NULL)
                    602:                return AF_UNSPEC;
                    603:        if ((dom = pr->pr_domain) == NULL)
                    604:                return AF_UNSPEC;
                    605:        return dom->dom_family;
                    606: }
                    607:
                    608: int
1.114     christos  609: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       610: {
1.160     ad        611:        int     error;
1.1       cgd       612:
1.160     ad        613:        solock(so);
1.140     dyoung    614:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160     ad        615:        sounlock(so);
1.140     dyoung    616:        return error;
1.1       cgd       617: }
                    618:
1.3       andrew    619: int
1.150     elad      620: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       621: {
1.160     ad        622:        int     error;
1.1       cgd       623:
1.160     ad        624:        solock(so);
1.158     ad        625:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        626:            SS_ISDISCONNECTING)) != 0) {
                    627:                sounlock(so);
1.210     matt      628:                return (EINVAL);
1.163     ad        629:        }
1.140     dyoung    630:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      631:            NULL, NULL, l);
1.140     dyoung    632:        if (error != 0) {
1.160     ad        633:                sounlock(so);
1.140     dyoung    634:                return error;
1.1       cgd       635:        }
1.63      matt      636:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       637:                so->so_options |= SO_ACCEPTCONN;
                    638:        if (backlog < 0)
                    639:                backlog = 0;
1.49      jonathan  640:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        641:        sounlock(so);
1.140     dyoung    642:        return 0;
1.1       cgd       643: }
                    644:
1.21      christos  645: void
1.54      lukem     646: sofree(struct socket *so)
1.1       cgd       647: {
1.161     ad        648:        u_int refs;
1.1       cgd       649:
1.160     ad        650:        KASSERT(solocked(so));
                    651:
                    652:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    653:                sounlock(so);
1.1       cgd       654:                return;
1.160     ad        655:        }
1.43      mycroft   656:        if (so->so_head) {
                    657:                /*
                    658:                 * We must not decommission a socket that's on the accept(2)
                    659:                 * queue.  If we do, then accept(2) may hang after select(2)
                    660:                 * indicated that the listening socket was ready.
                    661:                 */
1.160     ad        662:                if (!soqremque(so, 0)) {
                    663:                        sounlock(so);
1.43      mycroft   664:                        return;
1.160     ad        665:                }
1.43      mycroft   666:        }
1.98      christos  667:        if (so->so_rcv.sb_hiwat)
1.110     christos  668:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  669:                    RLIM_INFINITY);
                    670:        if (so->so_snd.sb_hiwat)
1.110     christos  671:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  672:                    RLIM_INFINITY);
                    673:        sbrelease(&so->so_snd, so);
1.160     ad        674:        KASSERT(!cv_has_waiters(&so->so_cv));
                    675:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    676:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       677:        sorflush(so);
1.161     ad        678:        refs = so->so_aborting; /* XXX */
1.177     ad        679:        /* Remove acccept filter if one is present. */
1.170     tls       680:        if (so->so_accf != NULL)
1.177     ad        681:                (void)accept_filt_clear(so);
1.160     ad        682:        sounlock(so);
1.161     ad        683:        if (refs == 0)          /* XXX */
                    684:                soput(so);
1.1       cgd       685: }
                    686:
                    687: /*
                    688:  * Close a socket on last file table reference removal.
                    689:  * Initiate disconnect if connected.
                    690:  * Free socket when disconnect complete.
                    691:  */
1.3       andrew    692: int
1.54      lukem     693: soclose(struct socket *so)
1.1       cgd       694: {
1.54      lukem     695:        struct socket   *so2;
1.160     ad        696:        int             error;
                    697:        int             error2;
1.1       cgd       698:
1.54      lukem     699:        error = 0;
1.160     ad        700:        solock(so);
1.1       cgd       701:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        702:                for (;;) {
                    703:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        704:                                KASSERT(solocked2(so, so2));
                    705:                                (void) soqremque(so2, 0);
                    706:                                /* soabort drops the lock. */
                    707:                                (void) soabort(so2);
                    708:                                solock(so);
1.172     ad        709:                                continue;
1.160     ad        710:                        }
1.172     ad        711:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        712:                                KASSERT(solocked2(so, so2));
                    713:                                (void) soqremque(so2, 1);
                    714:                                /* soabort drops the lock. */
                    715:                                (void) soabort(so2);
                    716:                                solock(so);
1.172     ad        717:                                continue;
1.160     ad        718:                        }
1.172     ad        719:                        break;
                    720:                }
1.1       cgd       721:        }
                    722:        if (so->so_pcb == 0)
                    723:                goto discard;
                    724:        if (so->so_state & SS_ISCONNECTED) {
                    725:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    726:                        error = sodisconnect(so);
                    727:                        if (error)
                    728:                                goto drop;
                    729:                }
                    730:                if (so->so_options & SO_LINGER) {
1.206     christos  731:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    732:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       733:                                goto drop;
1.21      christos  734:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      735:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  736:                                if (error)
1.1       cgd       737:                                        break;
1.21      christos  738:                        }
1.1       cgd       739:                }
                    740:        }
1.54      lukem     741:  drop:
1.1       cgd       742:        if (so->so_pcb) {
1.160     ad        743:                error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    744:                    NULL, NULL, NULL, NULL);
1.1       cgd       745:                if (error == 0)
                    746:                        error = error2;
                    747:        }
1.54      lukem     748:  discard:
1.1       cgd       749:        if (so->so_state & SS_NOFDREF)
                    750:                panic("soclose: NOFDREF");
1.198     elad      751:        kauth_cred_free(so->so_cred);
1.1       cgd       752:        so->so_state |= SS_NOFDREF;
                    753:        sofree(so);
                    754:        return (error);
                    755: }
                    756:
                    757: /*
1.160     ad        758:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       759:  */
1.3       andrew    760: int
1.54      lukem     761: soabort(struct socket *so)
1.1       cgd       762: {
1.161     ad        763:        u_int refs;
1.139     yamt      764:        int error;
1.160     ad        765:
                    766:        KASSERT(solocked(so));
                    767:        KASSERT(so->so_head == NULL);
1.1       cgd       768:
1.161     ad        769:        so->so_aborting++;              /* XXX */
1.140     dyoung    770:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    771:            NULL, NULL, NULL);
1.161     ad        772:        refs = --so->so_aborting;       /* XXX */
1.164     drochner  773:        if (error || (refs == 0)) {
1.139     yamt      774:                sofree(so);
1.160     ad        775:        } else {
                    776:                sounlock(so);
1.139     yamt      777:        }
                    778:        return error;
1.1       cgd       779: }
                    780:
1.3       andrew    781: int
1.54      lukem     782: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       783: {
1.160     ad        784:        int     error;
                    785:
                    786:        KASSERT(solocked(so));
1.1       cgd       787:
1.54      lukem     788:        error = 0;
1.1       cgd       789:        if ((so->so_state & SS_NOFDREF) == 0)
                    790:                panic("soaccept: !NOFDREF");
                    791:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   792:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    793:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   794:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    795:                    NULL, nam, NULL, NULL);
1.41      mycroft   796:        else
1.53      itojun    797:                error = ECONNABORTED;
1.52      itojun    798:
1.1       cgd       799:        return (error);
                    800: }
                    801:
1.3       andrew    802: int
1.114     christos  803: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       804: {
1.160     ad        805:        int             error;
                    806:
                    807:        KASSERT(solocked(so));
1.1       cgd       808:
                    809:        if (so->so_options & SO_ACCEPTCONN)
                    810:                return (EOPNOTSUPP);
                    811:        /*
                    812:         * If protocol is connection-based, can only connect once.
                    813:         * Otherwise, if connected, try to disconnect first.
                    814:         * This allows user to disconnect by connecting to, e.g.,
                    815:         * a null address.
                    816:         */
                    817:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    818:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    819:            (error = sodisconnect(so))))
                    820:                error = EISCONN;
                    821:        else
                    822:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    823:                    NULL, nam, NULL, l);
1.1       cgd       824:        return (error);
                    825: }
                    826:
1.3       andrew    827: int
1.54      lukem     828: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       829: {
1.160     ad        830:        int     error;
                    831:
                    832:        KASSERT(solocked2(so1, so2));
1.1       cgd       833:
1.22      mycroft   834:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    835:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       836:        return (error);
                    837: }
                    838:
1.3       andrew    839: int
1.54      lukem     840: sodisconnect(struct socket *so)
1.1       cgd       841: {
1.160     ad        842:        int     error;
                    843:
                    844:        KASSERT(solocked(so));
1.1       cgd       845:
                    846:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    847:                error = ENOTCONN;
1.160     ad        848:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       849:                error = EALREADY;
1.160     ad        850:        } else {
                    851:                error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
                    852:                    NULL, NULL, NULL, NULL);
1.1       cgd       853:        }
                    854:        return (error);
                    855: }
                    856:
1.15      mycroft   857: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       858: /*
                    859:  * Send on a socket.
                    860:  * If send must go all at once and message is larger than
                    861:  * send buffering, then hard error.
                    862:  * Lock against other senders.
                    863:  * If must go all at once and not enough room now, then
                    864:  * inform user that this would block and do nothing.
                    865:  * Otherwise, if nonblocking, send as much as possible.
                    866:  * The data to be sent is described by "uio" if nonzero,
                    867:  * otherwise by the mbuf chain "top" (which must be null
                    868:  * if uio is not).  Data provided in mbuf chain must be small
                    869:  * enough to send all at once.
                    870:  *
                    871:  * Returns nonzero on error, timeout or signal; callers
                    872:  * must check for short counts if EINTR/ERESTART are returned.
                    873:  * Data and control buffers are freed on return.
                    874:  */
1.3       andrew    875: int
1.54      lukem     876: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  877:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       878: {
1.54      lukem     879:        struct mbuf     **mp, *m;
1.58      jdolecek  880:        long            space, len, resid, clen, mlen;
                    881:        int             error, s, dontroute, atomic;
1.196     dsl       882:        short           wakeup_state = 0;
1.54      lukem     883:
1.160     ad        884:        clen = 0;
1.64      thorpej   885:
1.160     ad        886:        /*
                    887:         * solock() provides atomicity of access.  splsoftnet() prevents
                    888:         * protocol processing soft interrupts from interrupting us and
                    889:         * blocking (expensive).
                    890:         */
                    891:        s = splsoftnet();
                    892:        solock(so);
1.54      lukem     893:        atomic = sosendallatonce(so) || top;
1.1       cgd       894:        if (uio)
                    895:                resid = uio->uio_resid;
                    896:        else
                    897:                resid = top->m_pkthdr.len;
1.7       cgd       898:        /*
                    899:         * In theory resid should be unsigned.
                    900:         * However, space must be signed, as it might be less than 0
                    901:         * if we over-committed, and we must use a signed comparison
                    902:         * of space and resid.  On the other hand, a negative resid
                    903:         * causes us to loop sending 0-length segments to the protocol.
                    904:         */
1.29      mycroft   905:        if (resid < 0) {
                    906:                error = EINVAL;
                    907:                goto out;
                    908:        }
1.1       cgd       909:        dontroute =
                    910:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    911:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  912:        l->l_ru.ru_msgsnd++;
1.1       cgd       913:        if (control)
                    914:                clen = control->m_len;
1.54      lukem     915:  restart:
1.21      christos  916:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       917:                goto out;
                    918:        do {
1.160     ad        919:                if (so->so_state & SS_CANTSENDMORE) {
                    920:                        error = EPIPE;
                    921:                        goto release;
                    922:                }
1.48      thorpej   923:                if (so->so_error) {
                    924:                        error = so->so_error;
                    925:                        so->so_error = 0;
                    926:                        goto release;
                    927:                }
1.1       cgd       928:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    929:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    930:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        931:                                    !(resid == 0 && clen != 0)) {
                    932:                                        error = ENOTCONN;
                    933:                                        goto release;
                    934:                                }
                    935:                        } else if (addr == 0) {
                    936:                                error = EDESTADDRREQ;
                    937:                                goto release;
                    938:                        }
1.1       cgd       939:                }
                    940:                space = sbspace(&so->so_snd);
                    941:                if (flags & MSG_OOB)
                    942:                        space += 1024;
1.21      christos  943:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        944:                    clen > so->so_snd.sb_hiwat) {
                    945:                        error = EMSGSIZE;
                    946:                        goto release;
                    947:                }
1.96      mycroft   948:                if (space < resid + clen &&
1.1       cgd       949:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  950:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        951:                                error = EWOULDBLOCK;
                    952:                                goto release;
                    953:                        }
1.1       cgd       954:                        sbunlock(&so->so_snd);
1.196     dsl       955:                        if (wakeup_state & SS_RESTARTSYS) {
                    956:                                error = ERESTART;
                    957:                                goto out;
                    958:                        }
1.1       cgd       959:                        error = sbwait(&so->so_snd);
                    960:                        if (error)
                    961:                                goto out;
1.196     dsl       962:                        wakeup_state = so->so_state;
1.1       cgd       963:                        goto restart;
                    964:                }
1.196     dsl       965:                wakeup_state = 0;
1.1       cgd       966:                mp = &top;
                    967:                space -= clen;
                    968:                do {
1.45      tv        969:                        if (uio == NULL) {
                    970:                                /*
                    971:                                 * Data is prepackaged in "top".
                    972:                                 */
                    973:                                resid = 0;
                    974:                                if (flags & MSG_EOR)
                    975:                                        top->m_flags |= M_EOR;
                    976:                        } else do {
1.160     ad        977:                                sounlock(so);
                    978:                                splx(s);
1.144     dyoung    979:                                if (top == NULL) {
1.78      matt      980:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        981:                                        mlen = MHLEN;
                    982:                                        m->m_pkthdr.len = 0;
1.140     dyoung    983:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv        984:                                } else {
1.78      matt      985:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv        986:                                        mlen = MLEN;
                    987:                                }
1.78      matt      988:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt      989:                                if (sock_loan_thresh >= 0 &&
                    990:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                    991:                                    space >= sock_loan_thresh &&
1.64      thorpej   992:                                    (len = sosend_loan(so, uio, m,
                    993:                                                       space)) != 0) {
                    994:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                    995:                                        space -= len;
                    996:                                        goto have_data;
                    997:                                }
1.45      tv        998:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej   999:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki      1000:                                        m_clget(m, M_DONTWAIT);
1.45      tv       1001:                                        if ((m->m_flags & M_EXT) == 0)
                   1002:                                                goto nopages;
                   1003:                                        mlen = MCLBYTES;
                   1004:                                        if (atomic && top == 0) {
1.58      jdolecek 1005:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1006:                                                    resid);
1.45      tv       1007:                                                m->m_data += max_hdr;
                   1008:                                        } else
1.58      jdolecek 1009:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1010:                                        space -= len;
                   1011:                                } else {
1.64      thorpej  1012:  nopages:
                   1013:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1014:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1015:                                        space -= len;
                   1016:                                        /*
                   1017:                                         * For datagram protocols, leave room
                   1018:                                         * for protocol headers in first mbuf.
                   1019:                                         */
                   1020:                                        if (atomic && top == 0 && len < mlen)
                   1021:                                                MH_ALIGN(m, len);
                   1022:                                }
1.144     dyoung   1023:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1024:  have_data:
1.45      tv       1025:                                resid = uio->uio_resid;
                   1026:                                m->m_len = len;
                   1027:                                *mp = m;
                   1028:                                top->m_pkthdr.len += len;
1.160     ad       1029:                                s = splsoftnet();
                   1030:                                solock(so);
1.144     dyoung   1031:                                if (error != 0)
1.45      tv       1032:                                        goto release;
                   1033:                                mp = &m->m_next;
                   1034:                                if (resid <= 0) {
                   1035:                                        if (flags & MSG_EOR)
                   1036:                                                top->m_flags |= M_EOR;
                   1037:                                        break;
                   1038:                                }
                   1039:                        } while (space > 0 && atomic);
1.108     perry    1040:
1.160     ad       1041:                        if (so->so_state & SS_CANTSENDMORE) {
                   1042:                                error = EPIPE;
                   1043:                                goto release;
                   1044:                        }
1.45      tv       1045:                        if (dontroute)
                   1046:                                so->so_options |= SO_DONTROUTE;
                   1047:                        if (resid > 0)
                   1048:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe 1049:                        error = (*so->so_proto->pr_usrreq)(so,
                   1050:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1051:                            top, addr, control, curlwp);
1.45      tv       1052:                        if (dontroute)
                   1053:                                so->so_options &= ~SO_DONTROUTE;
                   1054:                        if (resid > 0)
                   1055:                                so->so_state &= ~SS_MORETOCOME;
                   1056:                        clen = 0;
1.144     dyoung   1057:                        control = NULL;
                   1058:                        top = NULL;
1.45      tv       1059:                        mp = &top;
1.144     dyoung   1060:                        if (error != 0)
1.1       cgd      1061:                                goto release;
                   1062:                } while (resid && space > 0);
                   1063:        } while (resid);
                   1064:
1.54      lukem    1065:  release:
1.1       cgd      1066:        sbunlock(&so->so_snd);
1.54      lukem    1067:  out:
1.160     ad       1068:        sounlock(so);
                   1069:        splx(s);
1.1       cgd      1070:        if (top)
                   1071:                m_freem(top);
                   1072:        if (control)
                   1073:                m_freem(control);
                   1074:        return (error);
                   1075: }
                   1076:
                   1077: /*
1.159     ad       1078:  * Following replacement or removal of the first mbuf on the first
                   1079:  * mbuf chain of a socket buffer, push necessary state changes back
                   1080:  * into the socket buffer so that other consumers see the values
                   1081:  * consistently.  'nextrecord' is the callers locally stored value of
                   1082:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1083:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1084:  */
                   1085: static void
                   1086: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1087: {
                   1088:
1.160     ad       1089:        KASSERT(solocked(sb->sb_so));
                   1090:
1.159     ad       1091:        /*
                   1092:         * First, update for the new value of nextrecord.  If necessary,
                   1093:         * make it the first record.
                   1094:         */
                   1095:        if (sb->sb_mb != NULL)
                   1096:                sb->sb_mb->m_nextpkt = nextrecord;
                   1097:        else
                   1098:                sb->sb_mb = nextrecord;
                   1099:
                   1100:         /*
                   1101:          * Now update any dependent socket buffer fields to reflect
                   1102:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1103:          * the addition of a second clause that takes care of the
                   1104:          * case where sb_mb has been updated, but remains the last
                   1105:          * record.
                   1106:          */
                   1107:         if (sb->sb_mb == NULL) {
                   1108:                 sb->sb_mbtail = NULL;
                   1109:                 sb->sb_lastrecord = NULL;
                   1110:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1111:                 sb->sb_lastrecord = sb->sb_mb;
                   1112: }
                   1113:
                   1114: /*
1.1       cgd      1115:  * Implement receive operations on a socket.
                   1116:  * We depend on the way that records are added to the sockbuf
                   1117:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1118:  * must begin with an address if the protocol so specifies,
                   1119:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1120:  * and then zero or more mbufs of data.
                   1121:  * In order to avoid blocking network interrupts for the entire time here,
                   1122:  * we splx() while doing the actual copy to user space.
                   1123:  * Although the sockbuf is locked, new data may still be appended,
                   1124:  * and thus we must maintain consistency of the sockbuf during that time.
                   1125:  *
                   1126:  * The caller may receive the data as a single mbuf chain by supplying
                   1127:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1128:  * only for the count in uio_resid.
                   1129:  */
1.3       andrew   1130: int
1.54      lukem    1131: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1132:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1133: {
1.116     yamt     1134:        struct lwp *l = curlwp;
1.160     ad       1135:        struct mbuf     *m, **mp, *mt;
1.211     chs      1136:        size_t len, offset, moff, orig_resid;
                   1137:        int atomic, flags, error, s, type;
1.99      matt     1138:        const struct protosw    *pr;
1.54      lukem    1139:        struct mbuf     *nextrecord;
1.67      he       1140:        int             mbuf_removed = 0;
1.146     dyoung   1141:        const struct domain *dom;
1.196     dsl      1142:        short           wakeup_state = 0;
1.64      thorpej  1143:
1.54      lukem    1144:        pr = so->so_proto;
1.146     dyoung   1145:        atomic = pr->pr_flags & PR_ATOMIC;
                   1146:        dom = pr->pr_domain;
1.1       cgd      1147:        mp = mp0;
1.54      lukem    1148:        type = 0;
                   1149:        orig_resid = uio->uio_resid;
1.102     jonathan 1150:
1.144     dyoung   1151:        if (paddr != NULL)
                   1152:                *paddr = NULL;
                   1153:        if (controlp != NULL)
                   1154:                *controlp = NULL;
                   1155:        if (flagsp != NULL)
1.1       cgd      1156:                flags = *flagsp &~ MSG_EOR;
                   1157:        else
                   1158:                flags = 0;
1.66      enami    1159:
1.1       cgd      1160:        if (flags & MSG_OOB) {
                   1161:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1162:                solock(so);
1.17      cgd      1163:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1164:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1165:                sounlock(so);
1.1       cgd      1166:                if (error)
                   1167:                        goto bad;
                   1168:                do {
1.134     christos 1169:                        error = uiomove(mtod(m, void *),
1.211     chs      1170:                            MIN(uio->uio_resid, m->m_len), uio);
1.1       cgd      1171:                        m = m_free(m);
1.144     dyoung   1172:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1173:  bad:
1.144     dyoung   1174:                if (m != NULL)
1.1       cgd      1175:                        m_freem(m);
1.144     dyoung   1176:                return error;
1.1       cgd      1177:        }
1.144     dyoung   1178:        if (mp != NULL)
1.140     dyoung   1179:                *mp = NULL;
1.160     ad       1180:
                   1181:        /*
                   1182:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1183:         * protocol processing soft interrupts from interrupting us and
                   1184:         * blocking (expensive).
                   1185:         */
                   1186:        s = splsoftnet();
                   1187:        solock(so);
1.1       cgd      1188:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1189:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1190:
1.54      lukem    1191:  restart:
1.160     ad       1192:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1193:                sounlock(so);
                   1194:                splx(s);
1.144     dyoung   1195:                return error;
1.160     ad       1196:        }
1.1       cgd      1197:
                   1198:        m = so->so_rcv.sb_mb;
                   1199:        /*
                   1200:         * If we have less data than requested, block awaiting more
                   1201:         * (subject to any timeout) if:
1.15      mycroft  1202:         *   1. the current count is less than the low water mark,
1.1       cgd      1203:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1204:         *      receive operation at once if we block (resid <= hiwat), or
                   1205:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1206:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1207:         * we have to do the receive in sections, and thus risk returning
                   1208:         * a short count if a timeout or signal occurs after we start.
                   1209:         */
1.144     dyoung   1210:        if (m == NULL ||
                   1211:            ((flags & MSG_DONTWAIT) == 0 &&
                   1212:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1213:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1214:              ((flags & MSG_WAITALL) &&
                   1215:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1216:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1217: #ifdef DIAGNOSTIC
1.144     dyoung   1218:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1219:                        panic("receive 1");
                   1220: #endif
                   1221:                if (so->so_error) {
1.144     dyoung   1222:                        if (m != NULL)
1.15      mycroft  1223:                                goto dontblock;
1.1       cgd      1224:                        error = so->so_error;
                   1225:                        if ((flags & MSG_PEEK) == 0)
                   1226:                                so->so_error = 0;
                   1227:                        goto release;
                   1228:                }
                   1229:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1230:                        if (m != NULL)
1.15      mycroft  1231:                                goto dontblock;
1.1       cgd      1232:                        else
                   1233:                                goto release;
                   1234:                }
1.144     dyoung   1235:                for (; m != NULL; m = m->m_next)
1.1       cgd      1236:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1237:                                m = so->so_rcv.sb_mb;
                   1238:                                goto dontblock;
                   1239:                        }
                   1240:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1241:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1242:                        error = ENOTCONN;
                   1243:                        goto release;
                   1244:                }
                   1245:                if (uio->uio_resid == 0)
                   1246:                        goto release;
1.206     christos 1247:                if ((so->so_state & SS_NBIO) ||
                   1248:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1249:                        error = EWOULDBLOCK;
                   1250:                        goto release;
                   1251:                }
1.69      thorpej  1252:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1253:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1254:                sbunlock(&so->so_rcv);
1.196     dsl      1255:                if (wakeup_state & SS_RESTARTSYS)
                   1256:                        error = ERESTART;
                   1257:                else
                   1258:                        error = sbwait(&so->so_rcv);
1.160     ad       1259:                if (error != 0) {
                   1260:                        sounlock(so);
                   1261:                        splx(s);
1.144     dyoung   1262:                        return error;
1.160     ad       1263:                }
1.196     dsl      1264:                wakeup_state = so->so_state;
1.1       cgd      1265:                goto restart;
                   1266:        }
1.54      lukem    1267:  dontblock:
1.69      thorpej  1268:        /*
                   1269:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1270:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1271:         * pointer to the next record in the socket buffer.  We must keep the
                   1272:         * various socket buffer pointers and local stack versions of the
                   1273:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1274:         * socket lock, and re-reading them when picking it up.
1.159     ad       1275:         *
                   1276:         * Otherwise, we will race with the network stack appending new data
                   1277:         * or records onto the socket buffer by using inconsistent/stale
                   1278:         * versions of the field, possibly resulting in socket buffer
                   1279:         * corruption.
                   1280:         *
                   1281:         * By holding the high-level sblock(), we prevent simultaneous
                   1282:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1283:         */
1.144     dyoung   1284:        if (l != NULL)
1.157     ad       1285:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1286:        KASSERT(m == so->so_rcv.sb_mb);
                   1287:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1288:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1289:        nextrecord = m->m_nextpkt;
                   1290:        if (pr->pr_flags & PR_ADDR) {
                   1291: #ifdef DIAGNOSTIC
                   1292:                if (m->m_type != MT_SONAME)
                   1293:                        panic("receive 1a");
                   1294: #endif
1.3       andrew   1295:                orig_resid = 0;
1.1       cgd      1296:                if (flags & MSG_PEEK) {
                   1297:                        if (paddr)
                   1298:                                *paddr = m_copy(m, 0, m->m_len);
                   1299:                        m = m->m_next;
                   1300:                } else {
                   1301:                        sbfree(&so->so_rcv, m);
1.67      he       1302:                        mbuf_removed = 1;
1.144     dyoung   1303:                        if (paddr != NULL) {
1.1       cgd      1304:                                *paddr = m;
                   1305:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1306:                                m->m_next = NULL;
1.1       cgd      1307:                                m = so->so_rcv.sb_mb;
                   1308:                        } else {
                   1309:                                MFREE(m, so->so_rcv.sb_mb);
                   1310:                                m = so->so_rcv.sb_mb;
                   1311:                        }
1.159     ad       1312:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1313:                }
                   1314:        }
1.159     ad       1315:
                   1316:        /*
                   1317:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1318:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1319:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1320:         * perform externalization (or freeing if controlp == NULL).
                   1321:         */
                   1322:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1323:                struct mbuf *cm = NULL, *cmn;
                   1324:                struct mbuf **cme = &cm;
                   1325:
                   1326:                do {
                   1327:                        if (flags & MSG_PEEK) {
                   1328:                                if (controlp != NULL) {
                   1329:                                        *controlp = m_copy(m, 0, m->m_len);
                   1330:                                        controlp = &(*controlp)->m_next;
                   1331:                                }
                   1332:                                m = m->m_next;
                   1333:                        } else {
                   1334:                                sbfree(&so->so_rcv, m);
1.1       cgd      1335:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1336:                                m->m_next = NULL;
1.159     ad       1337:                                *cme = m;
                   1338:                                cme = &(*cme)->m_next;
1.1       cgd      1339:                                m = so->so_rcv.sb_mb;
1.159     ad       1340:                        }
                   1341:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1342:                if ((flags & MSG_PEEK) == 0)
                   1343:                        sbsync(&so->so_rcv, nextrecord);
                   1344:                for (; cm != NULL; cm = cmn) {
                   1345:                        cmn = cm->m_next;
                   1346:                        cm->m_next = NULL;
                   1347:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1348:                        if (controlp != NULL) {
                   1349:                                if (dom->dom_externalize != NULL &&
                   1350:                                    type == SCM_RIGHTS) {
1.160     ad       1351:                                        sounlock(so);
1.159     ad       1352:                                        splx(s);
1.204     christos 1353:                                        error = (*dom->dom_externalize)(cm, l,
                   1354:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1355:                                            O_CLOEXEC : 0);
1.159     ad       1356:                                        s = splsoftnet();
1.160     ad       1357:                                        solock(so);
1.159     ad       1358:                                }
                   1359:                                *controlp = cm;
                   1360:                                while (*controlp != NULL)
                   1361:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1362:                        } else {
1.106     itojun   1363:                                /*
                   1364:                                 * Dispose of any SCM_RIGHTS message that went
                   1365:                                 * through the read path rather than recv.
                   1366:                                 */
1.159     ad       1367:                                if (dom->dom_dispose != NULL &&
                   1368:                                    type == SCM_RIGHTS) {
1.160     ad       1369:                                        sounlock(so);
1.159     ad       1370:                                        (*dom->dom_dispose)(cm);
1.160     ad       1371:                                        solock(so);
1.159     ad       1372:                                }
                   1373:                                m_freem(cm);
1.1       cgd      1374:                        }
                   1375:                }
1.159     ad       1376:                if (m != NULL)
                   1377:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1378:                else
                   1379:                        nextrecord = so->so_rcv.sb_mb;
                   1380:                orig_resid = 0;
1.1       cgd      1381:        }
1.69      thorpej  1382:
1.159     ad       1383:        /* If m is non-NULL, we have some data to read. */
                   1384:        if (__predict_true(m != NULL)) {
1.1       cgd      1385:                type = m->m_type;
                   1386:                if (type == MT_OOBDATA)
                   1387:                        flags |= MSG_OOB;
                   1388:        }
1.69      thorpej  1389:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1390:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1391:
1.1       cgd      1392:        moff = 0;
                   1393:        offset = 0;
1.144     dyoung   1394:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1395:                if (m->m_type == MT_OOBDATA) {
                   1396:                        if (type != MT_OOBDATA)
                   1397:                                break;
                   1398:                } else if (type == MT_OOBDATA)
                   1399:                        break;
                   1400: #ifdef DIAGNOSTIC
                   1401:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1402:                        panic("receive 3");
                   1403: #endif
                   1404:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1405:                wakeup_state = 0;
1.1       cgd      1406:                len = uio->uio_resid;
                   1407:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1408:                        len = so->so_oobmark - offset;
                   1409:                if (len > m->m_len - moff)
                   1410:                        len = m->m_len - moff;
                   1411:                /*
                   1412:                 * If mp is set, just pass back the mbufs.
                   1413:                 * Otherwise copy them out via the uio, then free.
                   1414:                 * Sockbuf must be consistent here (points to current mbuf,
                   1415:                 * it points to next record) when we drop priority;
                   1416:                 * we must note any additions to the sockbuf when we
                   1417:                 * block interrupts again.
                   1418:                 */
1.144     dyoung   1419:                if (mp == NULL) {
1.69      thorpej  1420:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1421:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1422:                        sounlock(so);
1.1       cgd      1423:                        splx(s);
1.211     chs      1424:                        error = uiomove(mtod(m, char *) + moff, len, uio);
1.20      mycroft  1425:                        s = splsoftnet();
1.160     ad       1426:                        solock(so);
1.144     dyoung   1427:                        if (error != 0) {
1.67      he       1428:                                /*
                   1429:                                 * If any part of the record has been removed
                   1430:                                 * (such as the MT_SONAME mbuf, which will
                   1431:                                 * happen when PR_ADDR, and thus also
                   1432:                                 * PR_ATOMIC, is set), then drop the entire
                   1433:                                 * record to maintain the atomicity of the
                   1434:                                 * receive operation.
                   1435:                                 *
                   1436:                                 * This avoids a later panic("receive 1a")
                   1437:                                 * when compiled with DIAGNOSTIC.
                   1438:                                 */
1.146     dyoung   1439:                                if (m && mbuf_removed && atomic)
1.67      he       1440:                                        (void) sbdroprecord(&so->so_rcv);
                   1441:
1.57      jdolecek 1442:                                goto release;
1.67      he       1443:                        }
1.1       cgd      1444:                } else
                   1445:                        uio->uio_resid -= len;
                   1446:                if (len == m->m_len - moff) {
                   1447:                        if (m->m_flags & M_EOR)
                   1448:                                flags |= MSG_EOR;
                   1449:                        if (flags & MSG_PEEK) {
                   1450:                                m = m->m_next;
                   1451:                                moff = 0;
                   1452:                        } else {
                   1453:                                nextrecord = m->m_nextpkt;
                   1454:                                sbfree(&so->so_rcv, m);
                   1455:                                if (mp) {
                   1456:                                        *mp = m;
                   1457:                                        mp = &m->m_next;
                   1458:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1459:                                        *mp = NULL;
1.1       cgd      1460:                                } else {
                   1461:                                        MFREE(m, so->so_rcv.sb_mb);
                   1462:                                        m = so->so_rcv.sb_mb;
                   1463:                                }
1.69      thorpej  1464:                                /*
                   1465:                                 * If m != NULL, we also know that
                   1466:                                 * so->so_rcv.sb_mb != NULL.
                   1467:                                 */
                   1468:                                KASSERT(so->so_rcv.sb_mb == m);
                   1469:                                if (m) {
1.1       cgd      1470:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1471:                                        if (nextrecord == NULL)
                   1472:                                                so->so_rcv.sb_lastrecord = m;
                   1473:                                } else {
                   1474:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1475:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1476:                                }
                   1477:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1478:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1479:                        }
1.144     dyoung   1480:                } else if (flags & MSG_PEEK)
                   1481:                        moff += len;
                   1482:                else {
1.160     ad       1483:                        if (mp != NULL) {
                   1484:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1485:                                if (__predict_false(mt == NULL)) {
                   1486:                                        sounlock(so);
                   1487:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1488:                                        solock(so);
                   1489:                                }
                   1490:                                *mp = mt;
                   1491:                        }
1.144     dyoung   1492:                        m->m_data += len;
                   1493:                        m->m_len -= len;
                   1494:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1495:                }
                   1496:                if (so->so_oobmark) {
                   1497:                        if ((flags & MSG_PEEK) == 0) {
                   1498:                                so->so_oobmark -= len;
                   1499:                                if (so->so_oobmark == 0) {
                   1500:                                        so->so_state |= SS_RCVATMARK;
                   1501:                                        break;
                   1502:                                }
1.7       cgd      1503:                        } else {
1.1       cgd      1504:                                offset += len;
1.7       cgd      1505:                                if (offset == so->so_oobmark)
                   1506:                                        break;
                   1507:                        }
1.1       cgd      1508:                }
                   1509:                if (flags & MSG_EOR)
                   1510:                        break;
                   1511:                /*
                   1512:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1513:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1514:                 * termination.  If a signal/timeout occurs, return
                   1515:                 * with a short count but without error.
                   1516:                 * Keep sockbuf locked against other readers.
                   1517:                 */
1.144     dyoung   1518:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1519:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1520:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1521:                                break;
1.68      matt     1522:                        /*
                   1523:                         * If we are peeking and the socket receive buffer is
                   1524:                         * full, stop since we can't get more data to peek at.
                   1525:                         */
                   1526:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1527:                                break;
                   1528:                        /*
                   1529:                         * If we've drained the socket buffer, tell the
                   1530:                         * protocol in case it needs to do something to
                   1531:                         * get it filled again.
                   1532:                         */
                   1533:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1534:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1535:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1536:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1537:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1538:                        if (wakeup_state & SS_RESTARTSYS)
                   1539:                                error = ERESTART;
                   1540:                        else
                   1541:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1542:                        if (error != 0) {
1.1       cgd      1543:                                sbunlock(&so->so_rcv);
1.160     ad       1544:                                sounlock(so);
1.1       cgd      1545:                                splx(s);
1.144     dyoung   1546:                                return 0;
1.1       cgd      1547:                        }
1.21      christos 1548:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1549:                                nextrecord = m->m_nextpkt;
1.196     dsl      1550:                        wakeup_state = so->so_state;
1.1       cgd      1551:                }
                   1552:        }
1.3       andrew   1553:
1.146     dyoung   1554:        if (m && atomic) {
1.3       andrew   1555:                flags |= MSG_TRUNC;
                   1556:                if ((flags & MSG_PEEK) == 0)
                   1557:                        (void) sbdroprecord(&so->so_rcv);
                   1558:        }
1.1       cgd      1559:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1560:                if (m == NULL) {
1.69      thorpej  1561:                        /*
1.70      thorpej  1562:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1563:                         * part makes sure sb_lastrecord is up-to-date if
                   1564:                         * there is still data in the socket buffer.
                   1565:                         */
1.1       cgd      1566:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1567:                        if (so->so_rcv.sb_mb == NULL) {
                   1568:                                so->so_rcv.sb_mbtail = NULL;
                   1569:                                so->so_rcv.sb_lastrecord = NULL;
                   1570:                        } else if (nextrecord->m_nextpkt == NULL)
                   1571:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1572:                }
                   1573:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1574:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1575:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1576:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1577:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1578:        }
1.3       andrew   1579:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1580:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1581:                sbunlock(&so->so_rcv);
                   1582:                goto restart;
                   1583:        }
1.108     perry    1584:
1.144     dyoung   1585:        if (flagsp != NULL)
1.1       cgd      1586:                *flagsp |= flags;
1.54      lukem    1587:  release:
1.1       cgd      1588:        sbunlock(&so->so_rcv);
1.160     ad       1589:        sounlock(so);
1.1       cgd      1590:        splx(s);
1.144     dyoung   1591:        return error;
1.1       cgd      1592: }
                   1593:
1.14      mycroft  1594: int
1.54      lukem    1595: soshutdown(struct socket *so, int how)
1.1       cgd      1596: {
1.99      matt     1597:        const struct protosw    *pr;
1.160     ad       1598:        int     error;
                   1599:
                   1600:        KASSERT(solocked(so));
1.34      kleink   1601:
1.54      lukem    1602:        pr = so->so_proto;
1.34      kleink   1603:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1604:                return (EINVAL);
1.1       cgd      1605:
1.160     ad       1606:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1607:                sorflush(so);
1.160     ad       1608:                error = 0;
                   1609:        }
1.34      kleink   1610:        if (how == SHUT_WR || how == SHUT_RDWR)
1.160     ad       1611:                error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1612:                    NULL, NULL, NULL);
1.160     ad       1613:
                   1614:        return error;
1.1       cgd      1615: }
                   1616:
1.195     dsl      1617: void
1.196     dsl      1618: sorestart(struct socket *so)
1.188     ad       1619: {
1.196     dsl      1620:        /*
                   1621:         * An application has called close() on an fd on which another
                   1622:         * of its threads has called a socket system call.
                   1623:         * Mark this and wake everyone up, and code that would block again
                   1624:         * instead returns ERESTART.
                   1625:         * On system call re-entry the fd is validated and EBADF returned.
                   1626:         * Any other fd will block again on the 2nd syscall.
                   1627:         */
1.188     ad       1628:        solock(so);
1.196     dsl      1629:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1630:        cv_broadcast(&so->so_cv);
1.196     dsl      1631:        cv_broadcast(&so->so_snd.sb_cv);
                   1632:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1633:        sounlock(so);
                   1634: }
                   1635:
1.14      mycroft  1636: void
1.54      lukem    1637: sorflush(struct socket *so)
1.1       cgd      1638: {
1.54      lukem    1639:        struct sockbuf  *sb, asb;
1.99      matt     1640:        const struct protosw    *pr;
1.160     ad       1641:
                   1642:        KASSERT(solocked(so));
1.1       cgd      1643:
1.54      lukem    1644:        sb = &so->so_rcv;
                   1645:        pr = so->so_proto;
1.160     ad       1646:        socantrcvmore(so);
1.1       cgd      1647:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1648:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1649:        sbunlock(sb);
                   1650:        asb = *sb;
1.86      wrstuden 1651:        /*
                   1652:         * Clear most of the sockbuf structure, but leave some of the
                   1653:         * fields valid.
                   1654:         */
                   1655:        memset(&sb->sb_startzero, 0,
                   1656:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1657:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1658:                sounlock(so);
1.1       cgd      1659:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1660:                solock(so);
                   1661:        }
1.98      christos 1662:        sbrelease(&asb, so);
1.1       cgd      1663: }
                   1664:
1.171     plunky   1665: /*
                   1666:  * internal set SOL_SOCKET options
                   1667:  */
1.142     dyoung   1668: static int
1.171     plunky   1669: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1670: {
1.182     christos 1671:        int error = EINVAL, optval, opt;
1.171     plunky   1672:        struct linger l;
                   1673:        struct timeval tv;
1.142     dyoung   1674:
1.179     christos 1675:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1676:
1.170     tls      1677:        case SO_ACCEPTFILTER:
1.177     ad       1678:                error = accept_filt_setopt(so, sopt);
                   1679:                KASSERT(solocked(so));
1.170     tls      1680:                break;
                   1681:
1.171     plunky   1682:        case SO_LINGER:
                   1683:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1684:                solock(so);
1.171     plunky   1685:                if (error)
1.177     ad       1686:                        break;
1.171     plunky   1687:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1688:                    l.l_linger > (INT_MAX / hz)) {
                   1689:                        error = EDOM;
                   1690:                        break;
                   1691:                }
1.171     plunky   1692:                so->so_linger = l.l_linger;
                   1693:                if (l.l_onoff)
                   1694:                        so->so_options |= SO_LINGER;
                   1695:                else
                   1696:                        so->so_options &= ~SO_LINGER;
1.177     ad       1697:                break;
1.1       cgd      1698:
1.142     dyoung   1699:        case SO_DEBUG:
                   1700:        case SO_KEEPALIVE:
                   1701:        case SO_DONTROUTE:
                   1702:        case SO_USELOOPBACK:
                   1703:        case SO_BROADCAST:
                   1704:        case SO_REUSEADDR:
                   1705:        case SO_REUSEPORT:
                   1706:        case SO_OOBINLINE:
                   1707:        case SO_TIMESTAMP:
1.207     christos 1708:        case SO_NOSIGPIPE:
1.184     christos 1709: #ifdef SO_OTIMESTAMP
                   1710:        case SO_OTIMESTAMP:
                   1711: #endif
1.171     plunky   1712:                error = sockopt_getint(sopt, &optval);
1.177     ad       1713:                solock(so);
1.171     plunky   1714:                if (error)
1.177     ad       1715:                        break;
1.171     plunky   1716:                if (optval)
1.179     christos 1717:                        so->so_options |= opt;
1.142     dyoung   1718:                else
1.179     christos 1719:                        so->so_options &= ~opt;
1.142     dyoung   1720:                break;
                   1721:
                   1722:        case SO_SNDBUF:
                   1723:        case SO_RCVBUF:
                   1724:        case SO_SNDLOWAT:
                   1725:        case SO_RCVLOWAT:
1.171     plunky   1726:                error = sockopt_getint(sopt, &optval);
1.177     ad       1727:                solock(so);
1.171     plunky   1728:                if (error)
1.177     ad       1729:                        break;
1.1       cgd      1730:
1.142     dyoung   1731:                /*
                   1732:                 * Values < 1 make no sense for any of these
                   1733:                 * options, so disallow them.
                   1734:                 */
1.177     ad       1735:                if (optval < 1) {
                   1736:                        error = EINVAL;
                   1737:                        break;
                   1738:                }
1.1       cgd      1739:
1.179     christos 1740:                switch (opt) {
1.171     plunky   1741:                case SO_SNDBUF:
1.177     ad       1742:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1743:                                error = ENOBUFS;
                   1744:                                break;
                   1745:                        }
1.171     plunky   1746:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1747:                        break;
1.1       cgd      1748:
                   1749:                case SO_RCVBUF:
1.177     ad       1750:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1751:                                error = ENOBUFS;
                   1752:                                break;
                   1753:                        }
1.171     plunky   1754:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1755:                        break;
                   1756:
                   1757:                /*
                   1758:                 * Make sure the low-water is never greater than
                   1759:                 * the high-water.
                   1760:                 */
1.1       cgd      1761:                case SO_SNDLOWAT:
1.171     plunky   1762:                        if (optval > so->so_snd.sb_hiwat)
                   1763:                                optval = so->so_snd.sb_hiwat;
                   1764:
                   1765:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1766:                        break;
1.171     plunky   1767:
1.1       cgd      1768:                case SO_RCVLOWAT:
1.171     plunky   1769:                        if (optval > so->so_rcv.sb_hiwat)
                   1770:                                optval = so->so_rcv.sb_hiwat;
                   1771:
                   1772:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1773:                        break;
                   1774:                }
                   1775:                break;
1.28      thorpej  1776:
1.179     christos 1777: #ifdef COMPAT_50
                   1778:        case SO_OSNDTIMEO:
                   1779:        case SO_ORCVTIMEO: {
                   1780:                struct timeval50 otv;
                   1781:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1782:                if (error) {
                   1783:                        solock(so);
1.183     christos 1784:                        break;
1.186     pooka    1785:                }
1.179     christos 1786:                timeval50_to_timeval(&otv, &tv);
                   1787:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1788:                error = 0;
1.179     christos 1789:                /*FALLTHROUGH*/
                   1790:        }
                   1791: #endif /* COMPAT_50 */
                   1792:
1.142     dyoung   1793:        case SO_SNDTIMEO:
                   1794:        case SO_RCVTIMEO:
1.182     christos 1795:                if (error)
1.179     christos 1796:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1797:                solock(so);
1.171     plunky   1798:                if (error)
1.177     ad       1799:                        break;
1.171     plunky   1800:
1.177     ad       1801:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1802:                        error = EDOM;
                   1803:                        break;
                   1804:                }
1.28      thorpej  1805:
1.171     plunky   1806:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1807:                if (optval == 0 && tv.tv_usec != 0)
                   1808:                        optval = 1;
1.28      thorpej  1809:
1.179     christos 1810:                switch (opt) {
1.142     dyoung   1811:                case SO_SNDTIMEO:
1.171     plunky   1812:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1813:                        break;
                   1814:                case SO_RCVTIMEO:
1.171     plunky   1815:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1816:                        break;
                   1817:                }
                   1818:                break;
1.1       cgd      1819:
1.142     dyoung   1820:        default:
1.177     ad       1821:                solock(so);
                   1822:                error = ENOPROTOOPT;
                   1823:                break;
1.142     dyoung   1824:        }
1.177     ad       1825:        KASSERT(solocked(so));
                   1826:        return error;
1.142     dyoung   1827: }
1.1       cgd      1828:
1.142     dyoung   1829: int
1.171     plunky   1830: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1831: {
                   1832:        int error, prerr;
1.1       cgd      1833:
1.177     ad       1834:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1835:                error = sosetopt1(so, sopt);
1.177     ad       1836:                KASSERT(solocked(so));
                   1837:        } else {
1.142     dyoung   1838:                error = ENOPROTOOPT;
1.177     ad       1839:                solock(so);
                   1840:        }
1.1       cgd      1841:
1.142     dyoung   1842:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1843:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1844:                /* give the protocol stack a shot */
1.171     plunky   1845:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1846:                if (prerr == 0)
                   1847:                        error = 0;
                   1848:                else if (prerr != ENOPROTOOPT)
                   1849:                        error = prerr;
1.171     plunky   1850:        }
1.160     ad       1851:        sounlock(so);
1.142     dyoung   1852:        return error;
1.1       cgd      1853: }
                   1854:
1.171     plunky   1855: /*
                   1856:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1857:  */
                   1858: int
                   1859: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1860:     const void *val, size_t valsize)
                   1861: {
                   1862:        struct sockopt sopt;
                   1863:        int error;
                   1864:
                   1865:        KASSERT(valsize == 0 || val != NULL);
                   1866:
                   1867:        sockopt_init(&sopt, level, name, valsize);
                   1868:        sockopt_set(&sopt, val, valsize);
                   1869:
                   1870:        error = sosetopt(so, &sopt);
                   1871:
                   1872:        sockopt_destroy(&sopt);
                   1873:
                   1874:        return error;
                   1875: }
                   1876:
                   1877: /*
                   1878:  * internal get SOL_SOCKET options
                   1879:  */
                   1880: static int
                   1881: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1882: {
1.179     christos 1883:        int error, optval, opt;
1.171     plunky   1884:        struct linger l;
                   1885:        struct timeval tv;
                   1886:
1.179     christos 1887:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1888:
                   1889:        case SO_ACCEPTFILTER:
1.177     ad       1890:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1891:                break;
                   1892:
                   1893:        case SO_LINGER:
                   1894:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1895:                l.l_linger = so->so_linger;
                   1896:
                   1897:                error = sockopt_set(sopt, &l, sizeof(l));
                   1898:                break;
                   1899:
                   1900:        case SO_USELOOPBACK:
                   1901:        case SO_DONTROUTE:
                   1902:        case SO_DEBUG:
                   1903:        case SO_KEEPALIVE:
                   1904:        case SO_REUSEADDR:
                   1905:        case SO_REUSEPORT:
                   1906:        case SO_BROADCAST:
                   1907:        case SO_OOBINLINE:
                   1908:        case SO_TIMESTAMP:
1.207     christos 1909:        case SO_NOSIGPIPE:
1.184     christos 1910: #ifdef SO_OTIMESTAMP
                   1911:        case SO_OTIMESTAMP:
                   1912: #endif
1.179     christos 1913:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1914:                break;
                   1915:
                   1916:        case SO_TYPE:
                   1917:                error = sockopt_setint(sopt, so->so_type);
                   1918:                break;
                   1919:
                   1920:        case SO_ERROR:
                   1921:                error = sockopt_setint(sopt, so->so_error);
                   1922:                so->so_error = 0;
                   1923:                break;
                   1924:
                   1925:        case SO_SNDBUF:
                   1926:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1927:                break;
                   1928:
                   1929:        case SO_RCVBUF:
                   1930:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1931:                break;
                   1932:
                   1933:        case SO_SNDLOWAT:
                   1934:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1935:                break;
                   1936:
                   1937:        case SO_RCVLOWAT:
                   1938:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1939:                break;
                   1940:
1.179     christos 1941: #ifdef COMPAT_50
                   1942:        case SO_OSNDTIMEO:
                   1943:        case SO_ORCVTIMEO: {
                   1944:                struct timeval50 otv;
                   1945:
                   1946:                optval = (opt == SO_OSNDTIMEO ?
                   1947:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1948:
                   1949:                otv.tv_sec = optval / hz;
                   1950:                otv.tv_usec = (optval % hz) * tick;
                   1951:
                   1952:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1953:                break;
                   1954:        }
                   1955: #endif /* COMPAT_50 */
                   1956:
1.171     plunky   1957:        case SO_SNDTIMEO:
                   1958:        case SO_RCVTIMEO:
1.179     christos 1959:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1960:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1961:
                   1962:                tv.tv_sec = optval / hz;
                   1963:                tv.tv_usec = (optval % hz) * tick;
                   1964:
                   1965:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1966:                break;
                   1967:
                   1968:        case SO_OVERFLOWED:
                   1969:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1970:                break;
                   1971:
                   1972:        default:
                   1973:                error = ENOPROTOOPT;
                   1974:                break;
                   1975:        }
                   1976:
                   1977:        return (error);
                   1978: }
                   1979:
1.14      mycroft  1980: int
1.171     plunky   1981: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      1982: {
1.160     ad       1983:        int             error;
1.1       cgd      1984:
1.160     ad       1985:        solock(so);
1.171     plunky   1986:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      1987:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       1988:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   1989:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      1990:                } else
1.160     ad       1991:                        error = (ENOPROTOOPT);
1.1       cgd      1992:        } else {
1.171     plunky   1993:                error = sogetopt1(so, sopt);
                   1994:        }
                   1995:        sounlock(so);
                   1996:        return (error);
                   1997: }
                   1998:
                   1999: /*
                   2000:  * alloc sockopt data buffer buffer
                   2001:  *     - will be released at destroy
                   2002:  */
1.176     plunky   2003: static int
                   2004: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2005: {
                   2006:
                   2007:        KASSERT(sopt->sopt_size == 0);
                   2008:
1.176     plunky   2009:        if (len > sizeof(sopt->sopt_buf)) {
                   2010:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2011:                if (sopt->sopt_data == NULL)
                   2012:                        return ENOMEM;
                   2013:        } else
1.171     plunky   2014:                sopt->sopt_data = sopt->sopt_buf;
                   2015:
                   2016:        sopt->sopt_size = len;
1.176     plunky   2017:        return 0;
1.171     plunky   2018: }
                   2019:
                   2020: /*
                   2021:  * initialise sockopt storage
1.176     plunky   2022:  *     - MAY sleep during allocation
1.171     plunky   2023:  */
                   2024: void
                   2025: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2026: {
1.1       cgd      2027:
1.171     plunky   2028:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2029:
1.171     plunky   2030:        sopt->sopt_level = level;
                   2031:        sopt->sopt_name = name;
1.176     plunky   2032:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2033: }
                   2034:
                   2035: /*
                   2036:  * destroy sockopt storage
                   2037:  *     - will release any held memory references
                   2038:  */
                   2039: void
                   2040: sockopt_destroy(struct sockopt *sopt)
                   2041: {
                   2042:
                   2043:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2044:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2045:
                   2046:        memset(sopt, 0, sizeof(*sopt));
                   2047: }
                   2048:
                   2049: /*
                   2050:  * set sockopt value
                   2051:  *     - value is copied into sockopt
1.176     plunky   2052:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2053:  */
                   2054: int
                   2055: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2056: {
1.176     plunky   2057:        int error;
1.171     plunky   2058:
1.176     plunky   2059:        if (sopt->sopt_size == 0) {
                   2060:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2061:                if (error)
                   2062:                        return error;
                   2063:        }
1.171     plunky   2064:
                   2065:        KASSERT(sopt->sopt_size == len);
                   2066:        memcpy(sopt->sopt_data, buf, len);
                   2067:        return 0;
                   2068: }
                   2069:
                   2070: /*
                   2071:  * common case of set sockopt integer value
                   2072:  */
                   2073: int
                   2074: sockopt_setint(struct sockopt *sopt, int val)
                   2075: {
                   2076:
                   2077:        return sockopt_set(sopt, &val, sizeof(int));
                   2078: }
                   2079:
                   2080: /*
                   2081:  * get sockopt value
                   2082:  *     - correct size must be given
                   2083:  */
                   2084: int
                   2085: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2086: {
1.170     tls      2087:
1.171     plunky   2088:        if (sopt->sopt_size != len)
                   2089:                return EINVAL;
1.1       cgd      2090:
1.171     plunky   2091:        memcpy(buf, sopt->sopt_data, len);
                   2092:        return 0;
                   2093: }
1.1       cgd      2094:
1.171     plunky   2095: /*
                   2096:  * common case of get sockopt integer value
                   2097:  */
                   2098: int
                   2099: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2100: {
1.1       cgd      2101:
1.171     plunky   2102:        return sockopt_get(sopt, valp, sizeof(int));
                   2103: }
1.1       cgd      2104:
1.171     plunky   2105: /*
                   2106:  * set sockopt value from mbuf
                   2107:  *     - ONLY for legacy code
                   2108:  *     - mbuf is released by sockopt
1.176     plunky   2109:  *     - will not sleep
1.171     plunky   2110:  */
                   2111: int
                   2112: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2113: {
                   2114:        size_t len;
1.176     plunky   2115:        int error;
1.1       cgd      2116:
1.171     plunky   2117:        len = m_length(m);
1.1       cgd      2118:
1.176     plunky   2119:        if (sopt->sopt_size == 0) {
                   2120:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2121:                if (error)
                   2122:                        return error;
                   2123:        }
1.1       cgd      2124:
1.171     plunky   2125:        KASSERT(sopt->sopt_size == len);
                   2126:        m_copydata(m, 0, len, sopt->sopt_data);
                   2127:        m_freem(m);
1.1       cgd      2128:
1.171     plunky   2129:        return 0;
                   2130: }
1.1       cgd      2131:
1.171     plunky   2132: /*
                   2133:  * get sockopt value into mbuf
                   2134:  *     - ONLY for legacy code
                   2135:  *     - mbuf to be released by the caller
1.176     plunky   2136:  *     - will not sleep
1.171     plunky   2137:  */
                   2138: struct mbuf *
                   2139: sockopt_getmbuf(const struct sockopt *sopt)
                   2140: {
                   2141:        struct mbuf *m;
1.107     darrenr  2142:
1.176     plunky   2143:        if (sopt->sopt_size > MCLBYTES)
                   2144:                return NULL;
                   2145:
                   2146:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2147:        if (m == NULL)
                   2148:                return NULL;
                   2149:
1.176     plunky   2150:        if (sopt->sopt_size > MLEN) {
                   2151:                MCLGET(m, M_DONTWAIT);
                   2152:                if ((m->m_flags & M_EXT) == 0) {
                   2153:                        m_free(m);
                   2154:                        return NULL;
                   2155:                }
1.1       cgd      2156:        }
1.176     plunky   2157:
                   2158:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2159:        m->m_len = sopt->sopt_size;
1.160     ad       2160:
1.171     plunky   2161:        return m;
1.1       cgd      2162: }
                   2163:
1.14      mycroft  2164: void
1.54      lukem    2165: sohasoutofband(struct socket *so)
1.1       cgd      2166: {
1.153     rmind    2167:
1.90      christos 2168:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2169:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2170: }
1.72      jdolecek 2171:
                   2172: static void
                   2173: filt_sordetach(struct knote *kn)
                   2174: {
                   2175:        struct socket   *so;
                   2176:
1.155     ad       2177:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2178:        solock(so);
1.73      christos 2179:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2180:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2181:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2182:        sounlock(so);
1.72      jdolecek 2183: }
                   2184:
                   2185: /*ARGSUSED*/
                   2186: static int
1.129     yamt     2187: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2188: {
                   2189:        struct socket   *so;
1.160     ad       2190:        int rv;
1.72      jdolecek 2191:
1.155     ad       2192:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2193:        if (hint != NOTE_SUBMIT)
                   2194:                solock(so);
1.72      jdolecek 2195:        kn->kn_data = so->so_rcv.sb_cc;
                   2196:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2197:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2198:                kn->kn_fflags = so->so_error;
1.160     ad       2199:                rv = 1;
                   2200:        } else if (so->so_error)        /* temporary udp error */
                   2201:                rv = 1;
                   2202:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2203:                rv = (kn->kn_data >= kn->kn_sdata);
                   2204:        else
                   2205:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2206:        if (hint != NOTE_SUBMIT)
                   2207:                sounlock(so);
                   2208:        return rv;
1.72      jdolecek 2209: }
                   2210:
                   2211: static void
                   2212: filt_sowdetach(struct knote *kn)
                   2213: {
                   2214:        struct socket   *so;
                   2215:
1.155     ad       2216:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2217:        solock(so);
1.73      christos 2218:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2219:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2220:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2221:        sounlock(so);
1.72      jdolecek 2222: }
                   2223:
                   2224: /*ARGSUSED*/
                   2225: static int
1.129     yamt     2226: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2227: {
                   2228:        struct socket   *so;
1.160     ad       2229:        int rv;
1.72      jdolecek 2230:
1.155     ad       2231:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2232:        if (hint != NOTE_SUBMIT)
                   2233:                solock(so);
1.72      jdolecek 2234:        kn->kn_data = sbspace(&so->so_snd);
                   2235:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2236:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2237:                kn->kn_fflags = so->so_error;
1.160     ad       2238:                rv = 1;
                   2239:        } else if (so->so_error)        /* temporary udp error */
                   2240:                rv = 1;
                   2241:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2242:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2243:                rv = 0;
                   2244:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2245:                rv = (kn->kn_data >= kn->kn_sdata);
                   2246:        else
                   2247:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2248:        if (hint != NOTE_SUBMIT)
                   2249:                sounlock(so);
                   2250:        return rv;
1.72      jdolecek 2251: }
                   2252:
                   2253: /*ARGSUSED*/
                   2254: static int
1.129     yamt     2255: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2256: {
                   2257:        struct socket   *so;
1.160     ad       2258:        int rv;
1.72      jdolecek 2259:
1.155     ad       2260:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2261:
                   2262:        /*
                   2263:         * Set kn_data to number of incoming connections, not
                   2264:         * counting partial (incomplete) connections.
1.108     perry    2265:         */
1.160     ad       2266:        if (hint != NOTE_SUBMIT)
                   2267:                solock(so);
1.72      jdolecek 2268:        kn->kn_data = so->so_qlen;
1.160     ad       2269:        rv = (kn->kn_data > 0);
                   2270:        if (hint != NOTE_SUBMIT)
                   2271:                sounlock(so);
                   2272:        return rv;
1.72      jdolecek 2273: }
                   2274:
                   2275: static const struct filterops solisten_filtops =
                   2276:        { 1, NULL, filt_sordetach, filt_solisten };
                   2277: static const struct filterops soread_filtops =
                   2278:        { 1, NULL, filt_sordetach, filt_soread };
                   2279: static const struct filterops sowrite_filtops =
                   2280:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2281:
                   2282: int
1.129     yamt     2283: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2284: {
                   2285:        struct socket   *so;
                   2286:        struct sockbuf  *sb;
                   2287:
1.155     ad       2288:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2289:        solock(so);
1.72      jdolecek 2290:        switch (kn->kn_filter) {
                   2291:        case EVFILT_READ:
                   2292:                if (so->so_options & SO_ACCEPTCONN)
                   2293:                        kn->kn_fop = &solisten_filtops;
                   2294:                else
                   2295:                        kn->kn_fop = &soread_filtops;
                   2296:                sb = &so->so_rcv;
                   2297:                break;
                   2298:        case EVFILT_WRITE:
                   2299:                kn->kn_fop = &sowrite_filtops;
                   2300:                sb = &so->so_snd;
                   2301:                break;
                   2302:        default:
1.160     ad       2303:                sounlock(so);
1.149     pooka    2304:                return (EINVAL);
1.72      jdolecek 2305:        }
1.73      christos 2306:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2307:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2308:        sounlock(so);
1.72      jdolecek 2309:        return (0);
                   2310: }
                   2311:
1.154     ad       2312: static int
                   2313: sodopoll(struct socket *so, int events)
                   2314: {
                   2315:        int revents;
                   2316:
                   2317:        revents = 0;
                   2318:
                   2319:        if (events & (POLLIN | POLLRDNORM))
                   2320:                if (soreadable(so))
                   2321:                        revents |= events & (POLLIN | POLLRDNORM);
                   2322:
                   2323:        if (events & (POLLOUT | POLLWRNORM))
                   2324:                if (sowritable(so))
                   2325:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2326:
                   2327:        if (events & (POLLPRI | POLLRDBAND))
                   2328:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2329:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2330:
                   2331:        return revents;
                   2332: }
                   2333:
                   2334: int
                   2335: sopoll(struct socket *so, int events)
                   2336: {
                   2337:        int revents = 0;
                   2338:
1.160     ad       2339: #ifndef DIAGNOSTIC
                   2340:        /*
                   2341:         * Do a quick, unlocked check in expectation that the socket
                   2342:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2343:         * as the solocked() assertions will fail.
                   2344:         */
1.154     ad       2345:        if ((revents = sodopoll(so, events)) != 0)
                   2346:                return revents;
1.160     ad       2347: #endif
1.154     ad       2348:
1.160     ad       2349:        solock(so);
1.154     ad       2350:        if ((revents = sodopoll(so, events)) == 0) {
                   2351:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2352:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2353:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2354:                }
                   2355:
                   2356:                if (events & (POLLOUT | POLLWRNORM)) {
                   2357:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2358:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2359:                }
                   2360:        }
1.160     ad       2361:        sounlock(so);
1.154     ad       2362:
                   2363:        return revents;
                   2364: }
                   2365:
                   2366:
1.94      yamt     2367: #include <sys/sysctl.h>
                   2368:
                   2369: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212     pooka    2370: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94      yamt     2371:
                   2372: /*
                   2373:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2374:  * value is not too small.
                   2375:  * (XXX should we maybe make sure it's not too large as well?)
                   2376:  */
                   2377: static int
                   2378: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2379: {
                   2380:        int error, new_somaxkva;
                   2381:        struct sysctlnode node;
                   2382:
                   2383:        new_somaxkva = somaxkva;
                   2384:        node = *rnode;
                   2385:        node.sysctl_data = &new_somaxkva;
                   2386:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2387:        if (error || newp == NULL)
                   2388:                return (error);
                   2389:
                   2390:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2391:                return (EINVAL);
                   2392:
1.136     ad       2393:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2394:        somaxkva = new_somaxkva;
1.136     ad       2395:        cv_broadcast(&socurkva_cv);
                   2396:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2397:
                   2398:        return (error);
                   2399: }
                   2400:
1.212     pooka    2401: /*
                   2402:  * sysctl helper routine for kern.sbmax. Basically just ensures that
                   2403:  * any new value is not too small.
                   2404:  */
                   2405: static int
                   2406: sysctl_kern_sbmax(SYSCTLFN_ARGS)
                   2407: {
                   2408:        int error, new_sbmax;
                   2409:        struct sysctlnode node;
                   2410:
                   2411:        new_sbmax = sb_max;
                   2412:        node = *rnode;
                   2413:        node.sysctl_data = &new_sbmax;
                   2414:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2415:        if (error || newp == NULL)
                   2416:                return (error);
                   2417:
                   2418:        KERNEL_LOCK(1, NULL);
                   2419:        error = sb_max_set(new_sbmax);
                   2420:        KERNEL_UNLOCK_ONE(NULL);
                   2421:
                   2422:        return (error);
                   2423: }
                   2424:
1.178     pooka    2425: static void
1.212     pooka    2426: sysctl_kern_socket_setup(void)
1.94      yamt     2427: {
                   2428:
1.178     pooka    2429:        KASSERT(socket_sysctllog == NULL);
                   2430:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2431:                       CTLFLAG_PERMANENT,
                   2432:                       CTLTYPE_NODE, "kern", NULL,
                   2433:                       NULL, 0, NULL, 0,
                   2434:                       CTL_KERN, CTL_EOL);
                   2435:
1.178     pooka    2436:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2437:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2438:                       CTLTYPE_INT, "somaxkva",
                   2439:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2440:                                    "used for socket buffers"),
1.94      yamt     2441:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2442:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212     pooka    2443:
                   2444:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
                   2445:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2446:                       CTLTYPE_INT, "sbmax",
                   2447:                       SYSCTL_DESCR("Maximum socket buffer size"),
                   2448:                       sysctl_kern_sbmax, 0, NULL, 0,
                   2449:                       CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94      yamt     2450: }

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