Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/kern/uipc_socket.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/kern/uipc_socket.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.48.2.3 retrieving revision 1.209.2.3 diff -u -p -r1.48.2.3 -r1.209.2.3 --- src/sys/kern/uipc_socket.c 2001/02/11 19:16:50 1.48.2.3 +++ src/sys/kern/uipc_socket.c 2013/08/02 20:12:30 1.209.2.3 @@ -1,6 +1,37 @@ -/* $NetBSD: uipc_socket.c,v 1.48.2.3 2001/02/11 19:16:50 bouyer Exp $ */ +/* $NetBSD: uipc_socket.c,v 1.209.2.3 2013/08/02 20:12:30 martin Exp $ */ + +/*- + * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ /* + * Copyright (c) 2004 The FreeBSD Foundation + * Copyright (c) 2004 Robert Watson * Copyright (c) 1982, 1986, 1988, 1990, 1993 * The Regents of the University of California. All rights reserved. * @@ -12,11 +43,7 @@ * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors + * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * @@ -35,13 +62,22 @@ * @(#)uipc_socket.c 8.6 (Berkeley) 5/2/95 */ -#include "opt_compat_sunos.h" +#include +__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.209.2.3 2013/08/02 20:12:30 martin Exp $"); + +#include "opt_compat_netbsd.h" +#include "opt_sock_counters.h" +#include "opt_sosend_loan.h" +#include "opt_mbuftrace.h" +#include "opt_somaxkva.h" +#include "opt_multiprocessor.h" /* XXX */ #include #include #include #include -#include +#include +#include #include #include #include @@ -50,19 +86,396 @@ #include #include #include -#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef COMPAT_50 +#include +#include +#endif + +#include +#include +#include + +MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options"); +MALLOC_DEFINE(M_SONAME, "soname", "socket name"); + +extern const struct fileops socketops; + +extern int somaxconn; /* patchable (XXX sysctl) */ +int somaxconn = SOMAXCONN; +kmutex_t *softnet_lock; + +#ifdef SOSEND_COUNTERS +#include + +static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "sosend", "loan big"); +static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "sosend", "copy big"); +static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "sosend", "copy small"); +static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "sosend", "kva limit"); + +#define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++ + +EVCNT_ATTACH_STATIC(sosend_loan_big); +EVCNT_ATTACH_STATIC(sosend_copy_big); +EVCNT_ATTACH_STATIC(sosend_copy_small); +EVCNT_ATTACH_STATIC(sosend_kvalimit); +#else + +#define SOSEND_COUNTER_INCR(ev) /* nothing */ + +#endif /* SOSEND_COUNTERS */ + +#if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR) +int sock_loan_thresh = -1; +#else +int sock_loan_thresh = 4096; +#endif + +static kmutex_t so_pendfree_lock; +static struct mbuf *so_pendfree = NULL; + +#ifndef SOMAXKVA +#define SOMAXKVA (16 * 1024 * 1024) +#endif +int somaxkva = SOMAXKVA; +static int socurkva; +static kcondvar_t socurkva_cv; + +static kauth_listener_t socket_listener; + +#define SOCK_LOAN_CHUNK 65536 + +static void sopendfree_thread(void *); +static kcondvar_t pendfree_thread_cv; +static lwp_t *sopendfree_lwp; + +static void sysctl_kern_somaxkva_setup(void); +static struct sysctllog *socket_sysctllog; + +static vsize_t +sokvareserve(struct socket *so, vsize_t len) +{ + int error; + + mutex_enter(&so_pendfree_lock); + while (socurkva + len > somaxkva) { + SOSEND_COUNTER_INCR(&sosend_kvalimit); + error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock); + if (error) { + len = 0; + break; + } + } + socurkva += len; + mutex_exit(&so_pendfree_lock); + return len; +} + +static void +sokvaunreserve(vsize_t len) +{ + + mutex_enter(&so_pendfree_lock); + socurkva -= len; + cv_broadcast(&socurkva_cv); + mutex_exit(&so_pendfree_lock); +} + +/* + * sokvaalloc: allocate kva for loan. + */ + +vaddr_t +sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so) +{ + vaddr_t lva; + + /* + * reserve kva. + */ + + if (sokvareserve(so, len) == 0) + return 0; + + /* + * allocate kva. + */ + + lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask, + UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA); + if (lva == 0) { + sokvaunreserve(len); + return (0); + } + + return lva; +} + +/* + * sokvafree: free kva for loan. + */ + +void +sokvafree(vaddr_t sva, vsize_t len) +{ + + /* + * free kva. + */ + + uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY); + + /* + * unreserve kva. + */ + + sokvaunreserve(len); +} + +static void +sodoloanfree(struct vm_page **pgs, void *buf, size_t size) +{ + vaddr_t sva, eva; + vsize_t len; + int npgs; + + KASSERT(pgs != NULL); + + eva = round_page((vaddr_t) buf + size); + sva = trunc_page((vaddr_t) buf); + len = eva - sva; + npgs = len >> PAGE_SHIFT; + + pmap_kremove(sva, len); + pmap_update(pmap_kernel()); + uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE); + sokvafree(sva, len); +} + +/* + * sopendfree_thread: free mbufs on "pendfree" list. + * unlock and relock so_pendfree_lock when freeing mbufs. + */ + +static void +sopendfree_thread(void *v) +{ + struct mbuf *m, *next; + size_t rv; + + mutex_enter(&so_pendfree_lock); + + for (;;) { + rv = 0; + while (so_pendfree != NULL) { + m = so_pendfree; + so_pendfree = NULL; + mutex_exit(&so_pendfree_lock); + + for (; m != NULL; m = next) { + next = m->m_next; + KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0); + KASSERT(m->m_ext.ext_refcnt == 0); + + rv += m->m_ext.ext_size; + sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf, + m->m_ext.ext_size); + pool_cache_put(mb_cache, m); + } + + mutex_enter(&so_pendfree_lock); + } + if (rv) + cv_broadcast(&socurkva_cv); + cv_wait(&pendfree_thread_cv, &so_pendfree_lock); + } + panic("sopendfree_thread"); + /* NOTREACHED */ +} + +void +soloanfree(struct mbuf *m, void *buf, size_t size, void *arg) +{ + + KASSERT(m != NULL); + + /* + * postpone freeing mbuf. + * + * we can't do it in interrupt context + * because we need to put kva back to kernel_map. + */ + + mutex_enter(&so_pendfree_lock); + m->m_next = so_pendfree; + so_pendfree = m; + cv_signal(&pendfree_thread_cv); + mutex_exit(&so_pendfree_lock); +} + +static long +sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space) +{ + struct iovec *iov = uio->uio_iov; + vaddr_t sva, eva; + vsize_t len; + vaddr_t lva; + int npgs, error; + vaddr_t va; + int i; + + if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace)) + return (0); + + if (iov->iov_len < (size_t) space) + space = iov->iov_len; + if (space > SOCK_LOAN_CHUNK) + space = SOCK_LOAN_CHUNK; + + eva = round_page((vaddr_t) iov->iov_base + space); + sva = trunc_page((vaddr_t) iov->iov_base); + len = eva - sva; + npgs = len >> PAGE_SHIFT; + + KASSERT(npgs <= M_EXT_MAXPAGES); + + lva = sokvaalloc(sva, len, so); + if (lva == 0) + return 0; + + error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len, + m->m_ext.ext_pgs, UVM_LOAN_TOPAGE); + if (error) { + sokvafree(lva, len); + return (0); + } + + for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE) + pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]), + VM_PROT_READ, 0); + pmap_update(pmap_kernel()); + + lva += (vaddr_t) iov->iov_base & PAGE_MASK; + + MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so); + m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP; + + uio->uio_resid -= space; + /* uio_offset not updated, not set/used for write(2) */ + uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space; + uio->uio_iov->iov_len -= space; + if (uio->uio_iov->iov_len == 0) { + uio->uio_iov++; + uio->uio_iovcnt--; + } + + return (space); +} + +struct mbuf * +getsombuf(struct socket *so, int type) +{ + struct mbuf *m; + + m = m_get(M_WAIT, type); + MCLAIM(m, so->so_mowner); + return m; +} + +static int +socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, + void *arg0, void *arg1, void *arg2, void *arg3) +{ + int result; + enum kauth_network_req req; + + result = KAUTH_RESULT_DEFER; + req = (enum kauth_network_req)arg0; + + if ((action != KAUTH_NETWORK_SOCKET) && + (action != KAUTH_NETWORK_BIND)) + return result; + + switch (req) { + case KAUTH_REQ_NETWORK_BIND_PORT: + result = KAUTH_RESULT_ALLOW; + break; + + case KAUTH_REQ_NETWORK_SOCKET_DROP: { + /* Normal users can only drop their own connections. */ + struct socket *so = (struct socket *)arg1; + + if (proc_uidmatch(cred, so->so_cred) == 0) + result = KAUTH_RESULT_ALLOW; + + break; + } + + case KAUTH_REQ_NETWORK_SOCKET_OPEN: + /* We allow "raw" routing/bluetooth sockets to anyone. */ + if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE + || (u_long)arg1 == PF_BLUETOOTH) { + result = KAUTH_RESULT_ALLOW; + } else { + /* Privileged, let secmodel handle this. */ + if ((u_long)arg2 == SOCK_RAW) + break; + } -struct pool socket_pool; + result = KAUTH_RESULT_ALLOW; -extern int somaxconn; /* patchable (XXX sysctl) */ -int somaxconn = SOMAXCONN; + break; + + case KAUTH_REQ_NETWORK_SOCKET_CANSEE: + result = KAUTH_RESULT_ALLOW; + + break; + + default: + break; + } + + return result; +} void -soinit() +soinit(void) { - pool_init(&socket_pool, sizeof(struct socket), 0, 0, 0, - "sockpl", 0, NULL, NULL, M_SOCKET); + sysctl_kern_somaxkva_setup(); + + mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM); + softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); + cv_init(&socurkva_cv, "sokva"); + cv_init(&pendfree_thread_cv, "sopendfr"); + soinit2(); + + /* Set the initial adjusted socket buffer size. */ + if (sb_max_set(sb_max)) + panic("bad initial sb_max value: %lu", sb_max); + + socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, + socket_listener_cb, NULL); +} + +void +soinit1(void) +{ + int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, + sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree"); + if (error) + panic("soinit1 %d", error); } /* @@ -74,113 +487,200 @@ soinit() */ /*ARGSUSED*/ int -socreate(dom, aso, type, proto) - int dom; - struct socket **aso; - int type; - int proto; -{ - struct proc *p = curproc; /* XXX */ - struct protosw *prp; - struct socket *so; - int error; - int s; +socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l, + struct socket *lockso) +{ + const struct protosw *prp; + struct socket *so; + uid_t uid; + int error; + kmutex_t *lock; + + error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET, + KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type), + KAUTH_ARG(proto)); + if (error != 0) + return error; if (proto) prp = pffindproto(dom, proto, type); else prp = pffindtype(dom, type); - if (prp == 0 || prp->pr_usrreq == 0) - return (EPROTONOSUPPORT); + if (prp == NULL) { + /* no support for domain */ + if (pffinddomain(dom) == 0) + return EAFNOSUPPORT; + /* no support for socket type */ + if (proto == 0 && type != 0) + return EPROTOTYPE; + return EPROTONOSUPPORT; + } + if (prp->pr_usrreq == NULL) + return EPROTONOSUPPORT; if (prp->pr_type != type) - return (EPROTOTYPE); - s = splsoftnet(); - so = pool_get(&socket_pool, PR_WAITOK); - memset((caddr_t)so, 0, sizeof(*so)); - TAILQ_INIT(&so->so_q0); - TAILQ_INIT(&so->so_q); + return EPROTOTYPE; + + so = soget(true); so->so_type = type; so->so_proto = prp; so->so_send = sosend; so->so_receive = soreceive; - if (p != 0) - so->so_uid = p->p_ucred->cr_uid; - error = (*prp->pr_usrreq)(so, PRU_ATTACH, (struct mbuf *)0, - (struct mbuf *)(long)proto, (struct mbuf *)0, p); - if (error) { +#ifdef MBUFTRACE + so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner; + so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner; + so->so_mowner = &prp->pr_domain->dom_mowner; +#endif + uid = kauth_cred_geteuid(l->l_cred); + so->so_uidinfo = uid_find(uid); + so->so_cpid = l->l_proc->p_pid; + if (lockso != NULL) { + /* Caller wants us to share a lock. */ + lock = lockso->so_lock; + so->so_lock = lock; + mutex_obj_hold(lock); + mutex_enter(lock); + } else { + /* Lock assigned and taken during PRU_ATTACH. */ + } + error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL, + (struct mbuf *)(long)proto, NULL, l); + KASSERT(solocked(so)); + if (error != 0) { so->so_state |= SS_NOFDREF; sofree(so); - splx(s); - return (error); - } -#ifdef COMPAT_SUNOS - { - extern struct emul emul_sunos; - if (p->p_emul == &emul_sunos && type == SOCK_DGRAM) - so->so_options |= SO_BROADCAST; + return error; } -#endif - splx(s); + so->so_cred = kauth_cred_dup(l->l_cred); + sounlock(so); *aso = so; - return (0); + return 0; } +/* On success, write file descriptor to fdout and return zero. On + * failure, return non-zero; *fdout will be undefined. + */ int -sobind(so, nam, p) - struct socket *so; - struct mbuf *nam; - struct proc *p; +fsocreate(int domain, struct socket **sop, int type, int protocol, + struct lwp *l, int *fdout) { - int s = splsoftnet(); - int error; + struct socket *so; + struct file *fp; + int fd, error; + int flags = type & SOCK_FLAGS_MASK; + + type &= ~SOCK_FLAGS_MASK; + if ((error = fd_allocfile(&fp, &fd)) != 0) + return error; + fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0); + fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)| + ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0); + fp->f_type = DTYPE_SOCKET; + fp->f_ops = &socketops; + error = socreate(domain, &so, type, protocol, l, NULL); + if (error != 0) { + fd_abort(curproc, fp, fd); + } else { + if (sop != NULL) + *sop = so; + fp->f_data = so; + fd_affix(curproc, fp, fd); + *fdout = fd; + if (flags & SOCK_NONBLOCK) + so->so_state |= SS_NBIO; + } + return error; +} - error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, (struct mbuf *)0, - nam, (struct mbuf *)0, p); - splx(s); - return (error); +int +sofamily(const struct socket *so) +{ + const struct protosw *pr; + const struct domain *dom; + + if ((pr = so->so_proto) == NULL) + return AF_UNSPEC; + if ((dom = pr->pr_domain) == NULL) + return AF_UNSPEC; + return dom->dom_family; } int -solisten(so, backlog) - struct socket *so; - int backlog; +sobind(struct socket *so, struct mbuf *nam, struct lwp *l) { - int s = splsoftnet(), error; + int error; - error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, (struct mbuf *)0, - (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); - if (error) { - splx(s); - return (error); + solock(so); + error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l); + sounlock(so); + return error; +} + +int +solisten(struct socket *so, int backlog, struct lwp *l) +{ + int error; + + solock(so); + if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING | + SS_ISDISCONNECTING)) != 0) { + sounlock(so); + return (EOPNOTSUPP); } - if (so->so_q.tqh_first == NULL) + error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL, + NULL, NULL, l); + if (error != 0) { + sounlock(so); + return error; + } + if (TAILQ_EMPTY(&so->so_q)) so->so_options |= SO_ACCEPTCONN; if (backlog < 0) backlog = 0; so->so_qlimit = min(backlog, somaxconn); - splx(s); - return (0); + sounlock(so); + return 0; } void -sofree(so) - struct socket *so; +sofree(struct socket *so) { + u_int refs; + + KASSERT(solocked(so)); - if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) + if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) { + sounlock(so); return; + } if (so->so_head) { /* * We must not decommission a socket that's on the accept(2) * queue. If we do, then accept(2) may hang after select(2) * indicated that the listening socket was ready. */ - if (!soqremque(so, 0)) + if (!soqremque(so, 0)) { + sounlock(so); return; + } } - sbrelease(&so->so_snd); + if (so->so_rcv.sb_hiwat) + (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0, + RLIM_INFINITY); + if (so->so_snd.sb_hiwat) + (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0, + RLIM_INFINITY); + sbrelease(&so->so_snd, so); + KASSERT(!cv_has_waiters(&so->so_cv)); + KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv)); + KASSERT(!cv_has_waiters(&so->so_snd.sb_cv)); sorflush(so); - pool_put(&socket_pool, so); + refs = so->so_aborting; /* XXX */ + /* Remove acccept filter if one is present. */ + if (so->so_accf != NULL) + (void)accept_filt_clear(so); + sounlock(so); + if (refs == 0) /* XXX */ + soput(so); } /* @@ -189,21 +689,33 @@ sofree(so) * Free socket when disconnect complete. */ int -soclose(so) - struct socket *so; +soclose(struct socket *so) { - struct socket *so2; - int s = splsoftnet(); /* conservative */ - int error = 0; + struct socket *so2; + int error; + int error2; + error = 0; + solock(so); if (so->so_options & SO_ACCEPTCONN) { - while ((so2 = so->so_q0.tqh_first) != 0) { - (void) soqremque(so2, 0); - (void) soabort(so2); - } - while ((so2 = so->so_q.tqh_first) != 0) { - (void) soqremque(so2, 1); - (void) soabort(so2); + for (;;) { + if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) { + KASSERT(solocked2(so, so2)); + (void) soqremque(so2, 0); + /* soabort drops the lock. */ + (void) soabort(so2); + solock(so); + continue; + } + if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) { + KASSERT(solocked2(so, so2)); + (void) soqremque(so2, 1); + /* soabort drops the lock. */ + (void) soabort(so2); + solock(so); + continue; + } + break; } } if (so->so_pcb == 0) @@ -215,80 +727,86 @@ soclose(so) goto drop; } if (so->so_options & SO_LINGER) { - if ((so->so_state & SS_ISDISCONNECTING) && - (so->so_state & SS_NBIO)) + if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) == + (SS_ISDISCONNECTING|SS_NBIO)) goto drop; while (so->so_state & SS_ISCONNECTED) { - error = tsleep((caddr_t)&so->so_timeo, - PSOCK | PCATCH, netcls, - so->so_linger * hz); + error = sowait(so, true, so->so_linger * hz); if (error) break; } } } -drop: + drop: if (so->so_pcb) { - int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, - (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0, - (struct proc *)0); + error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, + NULL, NULL, NULL, NULL); if (error == 0) error = error2; } -discard: + discard: if (so->so_state & SS_NOFDREF) panic("soclose: NOFDREF"); + kauth_cred_free(so->so_cred); so->so_state |= SS_NOFDREF; sofree(so); - splx(s); return (error); } /* - * Must be called at splsoftnet... + * Must be called with the socket locked.. Will return with it unlocked. */ int -soabort(so) - struct socket *so; +soabort(struct socket *so) { - - return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, (struct mbuf *)0, - (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); + u_int refs; + int error; + + KASSERT(solocked(so)); + KASSERT(so->so_head == NULL); + + so->so_aborting++; /* XXX */ + error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL, + NULL, NULL, NULL); + refs = --so->so_aborting; /* XXX */ + if (error || (refs == 0)) { + sofree(so); + } else { + sounlock(so); + } + return error; } int -soaccept(so, nam) - struct socket *so; - struct mbuf *nam; +soaccept(struct socket *so, struct mbuf *nam) { - int s = splsoftnet(); - int error = 0; + int error; + + KASSERT(solocked(so)); + error = 0; if ((so->so_state & SS_NOFDREF) == 0) panic("soaccept: !NOFDREF"); so->so_state &= ~SS_NOFDREF; - if ((so->so_state & SS_ISDISCONNECTED) == 0) + if ((so->so_state & SS_ISDISCONNECTED) == 0 || + (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0) error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, - (struct mbuf *)0, nam, (struct mbuf *)0, (struct proc *)0); + NULL, nam, NULL, NULL); else error = ECONNABORTED; - splx(s); return (error); } int -soconnect(so, nam) - struct socket *so; - struct mbuf *nam; +soconnect(struct socket *so, struct mbuf *nam, struct lwp *l) { - struct proc *p = curproc; /* XXX */ - int s; - int error; + int error; + + KASSERT(solocked(so)); if (so->so_options & SO_ACCEPTCONN) return (EOPNOTSUPP); - s = splsoftnet(); /* * If protocol is connection-based, can only connect once. * Otherwise, if connected, try to disconnect first. @@ -301,46 +819,37 @@ soconnect(so, nam) error = EISCONN; else error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, - (struct mbuf *)0, nam, (struct mbuf *)0, p); - splx(s); + NULL, nam, NULL, l); return (error); } int -soconnect2(so1, so2) - struct socket *so1; - struct socket *so2; +soconnect2(struct socket *so1, struct socket *so2) { - int s = splsoftnet(); - int error; + int error; + + KASSERT(solocked2(so1, so2)); error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, - (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0, - (struct proc *)0); - splx(s); + NULL, (struct mbuf *)so2, NULL, NULL); return (error); } int -sodisconnect(so) - struct socket *so; +sodisconnect(struct socket *so) { - int s = splsoftnet(); - int error; + int error; + + KASSERT(solocked(so)); if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; - goto bad; - } - if (so->so_state & SS_ISDISCONNECTING) { + } else if (so->so_state & SS_ISDISCONNECTING) { error = EALREADY; - goto bad; + } else { + error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, + NULL, NULL, NULL, NULL); } - error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, - (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0, - (struct proc *)0); -bad: - splx(s); return (error); } @@ -363,21 +872,26 @@ bad: * Data and control buffers are freed on return. */ int -sosend(so, addr, uio, top, control, flags) - struct socket *so; - struct mbuf *addr; - struct uio *uio; - struct mbuf *top; - struct mbuf *control; - int flags; +sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top, + struct mbuf *control, int flags, struct lwp *l) { - struct proc *p = curproc; /* XXX */ - struct mbuf **mp; - struct mbuf *m; - long space, len, resid; - int clen = 0, error, s, dontroute, mlen; - int atomic = sosendallatonce(so) || top; + struct mbuf **mp, *m; + struct proc *p; + long space, len, resid, clen, mlen; + int error, s, dontroute, atomic; + short wakeup_state = 0; + p = l->l_proc; + clen = 0; + + /* + * solock() provides atomicity of access. splsoftnet() prevents + * protocol processing soft interrupts from interrupting us and + * blocking (expensive). + */ + s = splsoftnet(); + solock(so); + atomic = sosendallatonce(so) || top; if (uio) resid = uio->uio_resid; else @@ -396,50 +910,60 @@ sosend(so, addr, uio, top, control, flag dontroute = (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && (so->so_proto->pr_flags & PR_ATOMIC); - p->p_stats->p_ru.ru_msgsnd++; + l->l_ru.ru_msgsnd++; if (control) clen = control->m_len; -#define snderr(errno) { error = errno; splx(s); goto release; } - -restart: + restart: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0) goto out; do { - s = splsoftnet(); - if (so->so_state & SS_CANTSENDMORE) - snderr(EPIPE); + if (so->so_state & SS_CANTSENDMORE) { + error = EPIPE; + goto release; + } if (so->so_error) { error = so->so_error; so->so_error = 0; - splx(s); goto release; } if ((so->so_state & SS_ISCONNECTED) == 0) { if (so->so_proto->pr_flags & PR_CONNREQUIRED) { if ((so->so_state & SS_ISCONFIRMING) == 0 && - !(resid == 0 && clen != 0)) - snderr(ENOTCONN); - } else if (addr == 0) - snderr(EDESTADDRREQ); + !(resid == 0 && clen != 0)) { + error = ENOTCONN; + goto release; + } + } else if (addr == 0) { + error = EDESTADDRREQ; + goto release; + } } space = sbspace(&so->so_snd); if (flags & MSG_OOB) space += 1024; if ((atomic && resid > so->so_snd.sb_hiwat) || - clen > so->so_snd.sb_hiwat) - snderr(EMSGSIZE); - if (space < resid + clen && uio && + clen > so->so_snd.sb_hiwat) { + error = EMSGSIZE; + goto release; + } + if (space < resid + clen && (atomic || space < so->so_snd.sb_lowat || space < clen)) { - if (so->so_state & SS_NBIO) - snderr(EWOULDBLOCK); + if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) { + error = EWOULDBLOCK; + goto release; + } sbunlock(&so->so_snd); + if (wakeup_state & SS_RESTARTSYS) { + error = ERESTART; + goto out; + } error = sbwait(&so->so_snd); - splx(s); if (error) goto out; + wakeup_state = so->so_state; goto restart; } - splx(s); + wakeup_state = 0; mp = ⊤ space -= clen; do { @@ -451,33 +975,44 @@ restart: if (flags & MSG_EOR) top->m_flags |= M_EOR; } else do { - if (top == 0) { - MGETHDR(m, M_WAIT, MT_DATA); + sounlock(so); + splx(s); + if (top == NULL) { + m = m_gethdr(M_WAIT, MT_DATA); mlen = MHLEN; m->m_pkthdr.len = 0; - m->m_pkthdr.rcvif = (struct ifnet *)0; + m->m_pkthdr.rcvif = NULL; } else { - MGET(m, M_WAIT, MT_DATA); + m = m_get(M_WAIT, MT_DATA); mlen = MLEN; } + MCLAIM(m, so->so_snd.sb_mowner); + if (sock_loan_thresh >= 0 && + uio->uio_iov->iov_len >= sock_loan_thresh && + space >= sock_loan_thresh && + (len = sosend_loan(so, uio, m, + space)) != 0) { + SOSEND_COUNTER_INCR(&sosend_loan_big); + space -= len; + goto have_data; + } if (resid >= MINCLSIZE && space >= MCLBYTES) { - MCLGET(m, M_WAIT); + SOSEND_COUNTER_INCR(&sosend_copy_big); + m_clget(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) goto nopages; mlen = MCLBYTES; -#ifdef MAPPED_MBUFS - len = min(MCLBYTES, resid); -#else if (atomic && top == 0) { - len = min(MCLBYTES - max_hdr, resid); + len = lmin(MCLBYTES - max_hdr, + resid); m->m_data += max_hdr; } else - len = min(MCLBYTES, resid); -#endif + len = lmin(MCLBYTES, resid); space -= len; } else { -nopages: - len = min(min(mlen, resid), space); + nopages: + SOSEND_COUNTER_INCR(&sosend_copy_small); + len = lmin(lmin(mlen, resid), space); space -= len; /* * For datagram protocols, leave room @@ -486,12 +1021,15 @@ nopages: if (atomic && top == 0 && len < mlen) MH_ALIGN(m, len); } - error = uiomove(mtod(m, caddr_t), (int)len, uio); + error = uiomove(mtod(m, void *), (int)len, uio); + have_data: resid = uio->uio_resid; m->m_len = len; *mp = m; top->m_pkthdr.len += len; - if (error) + s = splsoftnet(); + solock(so); + if (error != 0) goto release; mp = &m->m_next; if (resid <= 0) { @@ -500,37 +1038,36 @@ nopages: break; } } while (space > 0 && atomic); - - s = splsoftnet(); - - if (so->so_state & SS_CANTSENDMORE) - snderr(EPIPE); + if (so->so_state & SS_CANTSENDMORE) { + error = EPIPE; + goto release; + } if (dontroute) so->so_options |= SO_DONTROUTE; if (resid > 0) so->so_state |= SS_MORETOCOME; error = (*so->so_proto->pr_usrreq)(so, (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, - top, addr, control, p); + top, addr, control, curlwp); if (dontroute) so->so_options &= ~SO_DONTROUTE; if (resid > 0) so->so_state &= ~SS_MORETOCOME; - splx(s); - clen = 0; - control = 0; - top = 0; + control = NULL; + top = NULL; mp = ⊤ - if (error) + if (error != 0) goto release; } while (resid && space > 0); } while (resid); -release: + release: sbunlock(&so->so_snd); -out: + out: + sounlock(so); + splx(s); if (top) m_freem(top); if (control) @@ -539,6 +1076,43 @@ out: } /* + * Following replacement or removal of the first mbuf on the first + * mbuf chain of a socket buffer, push necessary state changes back + * into the socket buffer so that other consumers see the values + * consistently. 'nextrecord' is the callers locally stored value of + * the original value of sb->sb_mb->m_nextpkt which must be restored + * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL. + */ +static void +sbsync(struct sockbuf *sb, struct mbuf *nextrecord) +{ + + KASSERT(solocked(sb->sb_so)); + + /* + * First, update for the new value of nextrecord. If necessary, + * make it the first record. + */ + if (sb->sb_mb != NULL) + sb->sb_mb->m_nextpkt = nextrecord; + else + sb->sb_mb = nextrecord; + + /* + * Now update any dependent socket buffer fields to reflect + * the new state. This is an inline of SB_EMPTY_FIXUP, with + * the addition of a second clause that takes care of the + * case where sb_mb has been updated, but remains the last + * record. + */ + if (sb->sb_mb == NULL) { + sb->sb_mbtail = NULL; + sb->sb_lastrecord = NULL; + } else if (sb->sb_mb->m_nextpkt == NULL) + sb->sb_lastrecord = sb->sb_mb; +} + +/* * Implement receive operations on a socket. * We depend on the way that records are added to the sockbuf * by sbappend*. In particular, each record (mbufs linked through m_next) @@ -555,57 +1129,72 @@ out: * only for the count in uio_resid. */ int -soreceive(so, paddr, uio, mp0, controlp, flagsp) - struct socket *so; - struct mbuf **paddr; - struct uio *uio; - struct mbuf **mp0; - struct mbuf **controlp; - int *flagsp; -{ - struct mbuf *m, **mp; - int flags, len, error, s, offset; - struct protosw *pr = so->so_proto; - struct mbuf *nextrecord; - int moff, type = 0; - int orig_resid = uio->uio_resid; - +soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio, + struct mbuf **mp0, struct mbuf **controlp, int *flagsp) +{ + struct lwp *l = curlwp; + struct mbuf *m, **mp, *mt; + size_t len, offset, moff, orig_resid; + int atomic, flags, error, s, type; + const struct protosw *pr; + struct mbuf *nextrecord; + int mbuf_removed = 0; + const struct domain *dom; + short wakeup_state = 0; + + pr = so->so_proto; + atomic = pr->pr_flags & PR_ATOMIC; + dom = pr->pr_domain; mp = mp0; - if (paddr) - *paddr = 0; - if (controlp) - *controlp = 0; - if (flagsp) + type = 0; + orig_resid = uio->uio_resid; + + if (paddr != NULL) + *paddr = NULL; + if (controlp != NULL) + *controlp = NULL; + if (flagsp != NULL) flags = *flagsp &~ MSG_EOR; else flags = 0; + if (flags & MSG_OOB) { m = m_get(M_WAIT, MT_DATA); + solock(so); error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m, - (struct mbuf *)(long)(flags & MSG_PEEK), (struct mbuf *)0, - (struct proc *)0); + (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l); + sounlock(so); if (error) goto bad; do { - error = uiomove(mtod(m, caddr_t), - (int) min(uio->uio_resid, m->m_len), uio); + error = uiomove(mtod(m, void *), + MIN(uio->uio_resid, m->m_len), uio); m = m_free(m); - } while (uio->uio_resid && error == 0 && m); -bad: - if (m) + } while (uio->uio_resid > 0 && error == 0 && m); + bad: + if (m != NULL) m_freem(m); - return (error); + return error; } - if (mp) - *mp = (struct mbuf *)0; - if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) - (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, - (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); + if (mp != NULL) + *mp = NULL; -restart: - if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) - return (error); + /* + * solock() provides atomicity of access. splsoftnet() prevents + * protocol processing soft interrupts from interrupting us and + * blocking (expensive). + */ s = splsoftnet(); + solock(so); + if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) + (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l); + + restart: + if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) { + sounlock(so); + splx(s); + return error; + } m = so->so_rcv.sb_mb; /* @@ -619,17 +1208,19 @@ restart: * we have to do the receive in sections, and thus risk returning * a short count if a timeout or signal occurs after we start. */ - if (m == 0 || (((flags & MSG_DONTWAIT) == 0 && - so->so_rcv.sb_cc < uio->uio_resid) && - (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || - ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && - m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { + if (m == NULL || + ((flags & MSG_DONTWAIT) == 0 && + so->so_rcv.sb_cc < uio->uio_resid && + (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || + ((flags & MSG_WAITALL) && + uio->uio_resid <= so->so_rcv.sb_hiwat)) && + m->m_nextpkt == NULL && !atomic)) { #ifdef DIAGNOSTIC - if (m == 0 && so->so_rcv.sb_cc) + if (m == NULL && so->so_rcv.sb_cc) panic("receive 1"); #endif if (so->so_error) { - if (m) + if (m != NULL) goto dontblock; error = so->so_error; if ((flags & MSG_PEEK) == 0) @@ -637,12 +1228,12 @@ restart: goto release; } if (so->so_state & SS_CANTRCVMORE) { - if (m) + if (m != NULL) goto dontblock; else goto release; } - for (; m; m = m->m_next) + for (; m != NULL; m = m->m_next) if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { m = so->so_rcv.sb_mb; goto dontblock; @@ -654,22 +1245,48 @@ restart: } if (uio->uio_resid == 0) goto release; - if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { + if ((so->so_state & SS_NBIO) || + (flags & (MSG_DONTWAIT|MSG_NBIO))) { error = EWOULDBLOCK; goto release; } + SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1"); sbunlock(&so->so_rcv); - error = sbwait(&so->so_rcv); - splx(s); - if (error) - return (error); + if (wakeup_state & SS_RESTARTSYS) + error = ERESTART; + else + error = sbwait(&so->so_rcv); + if (error != 0) { + sounlock(so); + splx(s); + return error; + } + wakeup_state = so->so_state; goto restart; } -dontblock: -#ifdef notyet /* XXXX */ - if (uio->uio_procp) - uio->uio_procp->p_stats->p_ru.ru_msgrcv++; -#endif + dontblock: + /* + * On entry here, m points to the first record of the socket buffer. + * From this point onward, we maintain 'nextrecord' as a cache of the + * pointer to the next record in the socket buffer. We must keep the + * various socket buffer pointers and local stack versions of the + * pointers in sync, pushing out modifications before dropping the + * socket lock, and re-reading them when picking it up. + * + * Otherwise, we will race with the network stack appending new data + * or records onto the socket buffer by using inconsistent/stale + * versions of the field, possibly resulting in socket buffer + * corruption. + * + * By holding the high-level sblock(), we prevent simultaneous + * readers from pulling off the front of the socket buffer. + */ + if (l != NULL) + l->l_ru.ru_msgrcv++; + KASSERT(m == so->so_rcv.sb_mb); + SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); nextrecord = m->m_nextpkt; if (pr->pr_flags & PR_ADDR) { #ifdef DIAGNOSTIC @@ -683,53 +1300,99 @@ dontblock: m = m->m_next; } else { sbfree(&so->so_rcv, m); - if (paddr) { + mbuf_removed = 1; + if (paddr != NULL) { *paddr = m; so->so_rcv.sb_mb = m->m_next; - m->m_next = 0; + m->m_next = NULL; m = so->so_rcv.sb_mb; } else { MFREE(m, so->so_rcv.sb_mb); m = so->so_rcv.sb_mb; } + sbsync(&so->so_rcv, nextrecord); } } - while (m && m->m_type == MT_CONTROL && error == 0) { - if (flags & MSG_PEEK) { - if (controlp) - *controlp = m_copy(m, 0, m->m_len); - m = m->m_next; - } else { - sbfree(&so->so_rcv, m); - if (controlp) { - if (pr->pr_domain->dom_externalize && - mtod(m, struct cmsghdr *)->cmsg_type == - SCM_RIGHTS) - error = (*pr->pr_domain->dom_externalize)(m); - *controlp = m; + + /* + * Process one or more MT_CONTROL mbufs present before any data mbufs + * in the first mbuf chain on the socket buffer. If MSG_PEEK, we + * just copy the data; if !MSG_PEEK, we call into the protocol to + * perform externalization (or freeing if controlp == NULL). + */ + if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) { + struct mbuf *cm = NULL, *cmn; + struct mbuf **cme = &cm; + + do { + if (flags & MSG_PEEK) { + if (controlp != NULL) { + *controlp = m_copy(m, 0, m->m_len); + controlp = &(*controlp)->m_next; + } + m = m->m_next; + } else { + sbfree(&so->so_rcv, m); so->so_rcv.sb_mb = m->m_next; - m->m_next = 0; + m->m_next = NULL; + *cme = m; + cme = &(*cme)->m_next; m = so->so_rcv.sb_mb; + } + } while (m != NULL && m->m_type == MT_CONTROL); + if ((flags & MSG_PEEK) == 0) + sbsync(&so->so_rcv, nextrecord); + for (; cm != NULL; cm = cmn) { + cmn = cm->m_next; + cm->m_next = NULL; + type = mtod(cm, struct cmsghdr *)->cmsg_type; + if (controlp != NULL) { + if (dom->dom_externalize != NULL && + type == SCM_RIGHTS) { + sounlock(so); + splx(s); + error = (*dom->dom_externalize)(cm, l, + (flags & MSG_CMSG_CLOEXEC) ? + O_CLOEXEC : 0); + s = splsoftnet(); + solock(so); + } + *controlp = cm; + while (*controlp != NULL) + controlp = &(*controlp)->m_next; } else { - MFREE(m, so->so_rcv.sb_mb); - m = so->so_rcv.sb_mb; + /* + * Dispose of any SCM_RIGHTS message that went + * through the read path rather than recv. + */ + if (dom->dom_dispose != NULL && + type == SCM_RIGHTS) { + sounlock(so); + (*dom->dom_dispose)(cm); + solock(so); + } + m_freem(cm); } } - if (controlp) { - orig_resid = 0; - controlp = &(*controlp)->m_next; - } + if (m != NULL) + nextrecord = so->so_rcv.sb_mb->m_nextpkt; + else + nextrecord = so->so_rcv.sb_mb; + orig_resid = 0; } - if (m) { - if ((flags & MSG_PEEK) == 0) - m->m_nextpkt = nextrecord; + + /* If m is non-NULL, we have some data to read. */ + if (__predict_true(m != NULL)) { type = m->m_type; if (type == MT_OOBDATA) flags |= MSG_OOB; } + SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); + moff = 0; offset = 0; - while (m && uio->uio_resid > 0 && error == 0) { + while (m != NULL && uio->uio_resid > 0 && error == 0) { if (m->m_type == MT_OOBDATA) { if (type != MT_OOBDATA) break; @@ -740,6 +1403,7 @@ dontblock: panic("receive 3"); #endif so->so_state &= ~SS_RCVATMARK; + wakeup_state = 0; len = uio->uio_resid; if (so->so_oobmark && len > so->so_oobmark - offset) len = so->so_oobmark - offset; @@ -753,10 +1417,31 @@ dontblock: * we must note any additions to the sockbuf when we * block interrupts again. */ - if (mp == 0) { + if (mp == NULL) { + SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove"); + sounlock(so); splx(s); - error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); + error = uiomove(mtod(m, char *) + moff, len, uio); s = splsoftnet(); + solock(so); + if (error != 0) { + /* + * If any part of the record has been removed + * (such as the MT_SONAME mbuf, which will + * happen when PR_ADDR, and thus also + * PR_ATOMIC, is set), then drop the entire + * record to maintain the atomicity of the + * receive operation. + * + * This avoids a later panic("receive 1a") + * when compiled with DIAGNOSTIC. + */ + if (m && mbuf_removed && atomic) + (void) sbdroprecord(&so->so_rcv); + + goto release; + } } else uio->uio_resid -= len; if (len == m->m_len - moff) { @@ -772,24 +1457,42 @@ dontblock: *mp = m; mp = &m->m_next; so->so_rcv.sb_mb = m = m->m_next; - *mp = (struct mbuf *)0; + *mp = NULL; } else { MFREE(m, so->so_rcv.sb_mb); m = so->so_rcv.sb_mb; } - if (m) + /* + * If m != NULL, we also know that + * so->so_rcv.sb_mb != NULL. + */ + KASSERT(so->so_rcv.sb_mb == m); + if (m) { m->m_nextpkt = nextrecord; + if (nextrecord == NULL) + so->so_rcv.sb_lastrecord = m; + } else { + so->so_rcv.sb_mb = nextrecord; + SB_EMPTY_FIXUP(&so->so_rcv); + } + SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); } - } else { - if (flags & MSG_PEEK) - moff += len; - else { - if (mp) - *mp = m_copym(m, 0, len, M_WAIT); - m->m_data += len; - m->m_len -= len; - so->so_rcv.sb_cc -= len; + } else if (flags & MSG_PEEK) + moff += len; + else { + if (mp != NULL) { + mt = m_copym(m, 0, len, M_NOWAIT); + if (__predict_false(mt == NULL)) { + sounlock(so); + mt = m_copym(m, 0, len, M_WAIT); + solock(so); + } + *mp = mt; } + m->m_data += len; + m->m_len -= len; + so->so_rcv.sb_cc -= len; } if (so->so_oobmark) { if ((flags & MSG_PEEK) == 0) { @@ -813,325 +1516,904 @@ dontblock: * with a short count but without error. * Keep sockbuf locked against other readers. */ - while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && + while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 && !sosendallatonce(so) && !nextrecord) { if (so->so_error || so->so_state & SS_CANTRCVMORE) break; - error = sbwait(&so->so_rcv); - if (error) { + /* + * If we are peeking and the socket receive buffer is + * full, stop since we can't get more data to peek at. + */ + if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0) + break; + /* + * If we've drained the socket buffer, tell the + * protocol in case it needs to do something to + * get it filled again. + */ + if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb) + (*pr->pr_usrreq)(so, PRU_RCVD, + NULL, (struct mbuf *)(long)flags, NULL, l); + SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2"); + if (wakeup_state & SS_RESTARTSYS) + error = ERESTART; + else + error = sbwait(&so->so_rcv); + if (error != 0) { sbunlock(&so->so_rcv); + sounlock(so); splx(s); - return (0); + return 0; } if ((m = so->so_rcv.sb_mb) != NULL) nextrecord = m->m_nextpkt; + wakeup_state = so->so_state; } } - if (m && pr->pr_flags & PR_ATOMIC) { + if (m && atomic) { flags |= MSG_TRUNC; if ((flags & MSG_PEEK) == 0) (void) sbdroprecord(&so->so_rcv); } if ((flags & MSG_PEEK) == 0) { - if (m == 0) + if (m == NULL) { + /* + * First part is an inline SB_EMPTY_FIXUP(). Second + * part makes sure sb_lastrecord is up-to-date if + * there is still data in the socket buffer. + */ so->so_rcv.sb_mb = nextrecord; + if (so->so_rcv.sb_mb == NULL) { + so->so_rcv.sb_mbtail = NULL; + so->so_rcv.sb_lastrecord = NULL; + } else if (nextrecord->m_nextpkt == NULL) + so->so_rcv.sb_lastrecord = nextrecord; + } + SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); + SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) - (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, - (struct mbuf *)(long)flags, (struct mbuf *)0, - (struct proc *)0); + (*pr->pr_usrreq)(so, PRU_RCVD, NULL, + (struct mbuf *)(long)flags, NULL, l); } if (orig_resid == uio->uio_resid && orig_resid && (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { sbunlock(&so->so_rcv); - splx(s); goto restart; } - - if (flagsp) + + if (flagsp != NULL) *flagsp |= flags; -release: + release: sbunlock(&so->so_rcv); + sounlock(so); splx(s); - return (error); + return error; } int -soshutdown(so, how) - struct socket *so; - int how; +soshutdown(struct socket *so, int how) { - struct protosw *pr = so->so_proto; + const struct protosw *pr; + int error; + KASSERT(solocked(so)); + + pr = so->so_proto; if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) return (EINVAL); - if (how == SHUT_RD || how == SHUT_RDWR) + if (how == SHUT_RD || how == SHUT_RDWR) { sorflush(so); + error = 0; + } if (how == SHUT_WR || how == SHUT_RDWR) - return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, (struct mbuf *)0, - (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); - return (0); + error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL, + NULL, NULL, NULL); + + return error; } void -sorflush(so) - struct socket *so; +sorestart(struct socket *so) { - struct sockbuf *sb = &so->so_rcv; - struct protosw *pr = so->so_proto; - int s; - struct sockbuf asb; + /* + * An application has called close() on an fd on which another + * of its threads has called a socket system call. + * Mark this and wake everyone up, and code that would block again + * instead returns ERESTART. + * On system call re-entry the fd is validated and EBADF returned. + * Any other fd will block again on the 2nd syscall. + */ + solock(so); + so->so_state |= SS_RESTARTSYS; + cv_broadcast(&so->so_cv); + cv_broadcast(&so->so_snd.sb_cv); + cv_broadcast(&so->so_rcv.sb_cv); + sounlock(so); +} - sb->sb_flags |= SB_NOINTR; - (void) sblock(sb, M_WAITOK); - s = splimp(); +void +sorflush(struct socket *so) +{ + struct sockbuf *sb, asb; + const struct protosw *pr; + + KASSERT(solocked(so)); + + sb = &so->so_rcv; + pr = so->so_proto; socantrcvmore(so); + sb->sb_flags |= SB_NOINTR; + (void )sblock(sb, M_WAITOK); sbunlock(sb); asb = *sb; - memset((caddr_t)sb, 0, sizeof(*sb)); - splx(s); - if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) + /* + * Clear most of the sockbuf structure, but leave some of the + * fields valid. + */ + memset(&sb->sb_startzero, 0, + sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); + if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) { + sounlock(so); (*pr->pr_domain->dom_dispose)(asb.sb_mb); - sbrelease(&asb); + solock(so); + } + sbrelease(&asb, so); } -int -sosetopt(so, level, optname, m0) - struct socket *so; - int level, optname; - struct mbuf *m0; +/* + * internal set SOL_SOCKET options + */ +static int +sosetopt1(struct socket *so, const struct sockopt *sopt) { - int error = 0; - struct mbuf *m = m0; + int error = EINVAL, optval, opt; + struct linger l; + struct timeval tv; + + switch ((opt = sopt->sopt_name)) { + + case SO_ACCEPTFILTER: + error = accept_filt_setopt(so, sopt); + KASSERT(solocked(so)); + break; + + case SO_LINGER: + error = sockopt_get(sopt, &l, sizeof(l)); + solock(so); + if (error) + break; + if (l.l_linger < 0 || l.l_linger > USHRT_MAX || + l.l_linger > (INT_MAX / hz)) { + error = EDOM; + break; + } + so->so_linger = l.l_linger; + if (l.l_onoff) + so->so_options |= SO_LINGER; + else + so->so_options &= ~SO_LINGER; + break; + + case SO_DEBUG: + case SO_KEEPALIVE: + case SO_DONTROUTE: + case SO_USELOOPBACK: + case SO_BROADCAST: + case SO_REUSEADDR: + case SO_REUSEPORT: + case SO_OOBINLINE: + case SO_TIMESTAMP: + case SO_NOSIGPIPE: +#ifdef SO_OTIMESTAMP + case SO_OTIMESTAMP: +#endif + error = sockopt_getint(sopt, &optval); + solock(so); + if (error) + break; + if (optval) + so->so_options |= opt; + else + so->so_options &= ~opt; + break; + + case SO_SNDBUF: + case SO_RCVBUF: + case SO_SNDLOWAT: + case SO_RCVLOWAT: + error = sockopt_getint(sopt, &optval); + solock(so); + if (error) + break; - if (level != SOL_SOCKET) { - if (so->so_proto && so->so_proto->pr_ctloutput) - return ((*so->so_proto->pr_ctloutput) - (PRCO_SETOPT, so, level, optname, &m0)); - error = ENOPROTOOPT; - } else { - switch (optname) { + /* + * Values < 1 make no sense for any of these + * options, so disallow them. + */ + if (optval < 1) { + error = EINVAL; + break; + } - case SO_LINGER: - if (m == NULL || m->m_len != sizeof(struct linger)) { - error = EINVAL; - goto bad; + switch (opt) { + case SO_SNDBUF: + if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) { + error = ENOBUFS; + break; } - so->so_linger = mtod(m, struct linger *)->l_linger; - /* fall thru... */ + so->so_snd.sb_flags &= ~SB_AUTOSIZE; + break; - case SO_DEBUG: - case SO_KEEPALIVE: - case SO_DONTROUTE: - case SO_USELOOPBACK: - case SO_BROADCAST: - case SO_REUSEADDR: - case SO_REUSEPORT: - case SO_OOBINLINE: - case SO_TIMESTAMP: - if (m == NULL || m->m_len < sizeof(int)) { - error = EINVAL; - goto bad; + case SO_RCVBUF: + if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) { + error = ENOBUFS; + break; } - if (*mtod(m, int *)) - so->so_options |= optname; - else - so->so_options &= ~optname; + so->so_rcv.sb_flags &= ~SB_AUTOSIZE; break; - case SO_SNDBUF: - case SO_RCVBUF: + /* + * Make sure the low-water is never greater than + * the high-water. + */ case SO_SNDLOWAT: - case SO_RCVLOWAT: - { - int optval; + if (optval > so->so_snd.sb_hiwat) + optval = so->so_snd.sb_hiwat; - if (m == NULL || m->m_len < sizeof(int)) { - error = EINVAL; - goto bad; - } + so->so_snd.sb_lowat = optval; + break; - /* - * Values < 1 make no sense for any of these - * options, so disallow them. - */ - optval = *mtod(m, int *); - if (optval < 1) { - error = EINVAL; - goto bad; - } + case SO_RCVLOWAT: + if (optval > so->so_rcv.sb_hiwat) + optval = so->so_rcv.sb_hiwat; - switch (optname) { + so->so_rcv.sb_lowat = optval; + break; + } + break; - case SO_SNDBUF: - case SO_RCVBUF: - if (sbreserve(optname == SO_SNDBUF ? - &so->so_snd : &so->so_rcv, - (u_long) optval) == 0) { - error = ENOBUFS; - goto bad; - } - break; +#ifdef COMPAT_50 + case SO_OSNDTIMEO: + case SO_ORCVTIMEO: { + struct timeval50 otv; + error = sockopt_get(sopt, &otv, sizeof(otv)); + if (error) { + solock(so); + break; + } + timeval50_to_timeval(&otv, &tv); + opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO; + error = 0; + /*FALLTHROUGH*/ + } +#endif /* COMPAT_50 */ - /* - * Make sure the low-water is never greater than - * the high-water. - */ - case SO_SNDLOWAT: - so->so_snd.sb_lowat = - (optval > so->so_snd.sb_hiwat) ? - so->so_snd.sb_hiwat : optval; - break; - case SO_RCVLOWAT: - so->so_rcv.sb_lowat = - (optval > so->so_rcv.sb_hiwat) ? - so->so_rcv.sb_hiwat : optval; - break; - } + case SO_SNDTIMEO: + case SO_RCVTIMEO: + if (error) + error = sockopt_get(sopt, &tv, sizeof(tv)); + solock(so); + if (error) break; - } - case SO_SNDTIMEO: - case SO_RCVTIMEO: - { - struct timeval *tv; - short val; - - if (m == NULL || m->m_len < sizeof(*tv)) { - error = EINVAL; - goto bad; - } - tv = mtod(m, struct timeval *); - if (tv->tv_sec * hz + tv->tv_usec / tick > SHRT_MAX) { - error = EDOM; - goto bad; - } - val = tv->tv_sec * hz + tv->tv_usec / tick; + if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) { + error = EDOM; + break; + } - switch (optname) { + optval = tv.tv_sec * hz + tv.tv_usec / tick; + if (optval == 0 && tv.tv_usec != 0) + optval = 1; - case SO_SNDTIMEO: - so->so_snd.sb_timeo = val; - break; - case SO_RCVTIMEO: - so->so_rcv.sb_timeo = val; - break; - } + switch (opt) { + case SO_SNDTIMEO: + so->so_snd.sb_timeo = optval; break; - } - - default: - error = ENOPROTOOPT; + case SO_RCVTIMEO: + so->so_rcv.sb_timeo = optval; break; } - if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { - (void) ((*so->so_proto->pr_ctloutput) - (PRCO_SETOPT, so, level, optname, &m0)); - m = NULL; /* freed by protocol */ - } + break; + + default: + solock(so); + error = ENOPROTOOPT; + break; + } + KASSERT(solocked(so)); + return error; +} + +int +sosetopt(struct socket *so, struct sockopt *sopt) +{ + int error, prerr; + + if (sopt->sopt_level == SOL_SOCKET) { + error = sosetopt1(so, sopt); + KASSERT(solocked(so)); + } else { + error = ENOPROTOOPT; + solock(so); + } + + if ((error == 0 || error == ENOPROTOOPT) && + so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) { + /* give the protocol stack a shot */ + prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt); + if (prerr == 0) + error = 0; + else if (prerr != ENOPROTOOPT) + error = prerr; + } + sounlock(so); + return error; +} + +/* + * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt() + */ +int +so_setsockopt(struct lwp *l, struct socket *so, int level, int name, + const void *val, size_t valsize) +{ + struct sockopt sopt; + int error; + + KASSERT(valsize == 0 || val != NULL); + + sockopt_init(&sopt, level, name, valsize); + sockopt_set(&sopt, val, valsize); + + error = sosetopt(so, &sopt); + + sockopt_destroy(&sopt); + + return error; +} + +/* + * internal get SOL_SOCKET options + */ +static int +sogetopt1(struct socket *so, struct sockopt *sopt) +{ + int error, optval, opt; + struct linger l; + struct timeval tv; + + switch ((opt = sopt->sopt_name)) { + + case SO_ACCEPTFILTER: + error = accept_filt_getopt(so, sopt); + break; + + case SO_LINGER: + l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0; + l.l_linger = so->so_linger; + + error = sockopt_set(sopt, &l, sizeof(l)); + break; + + case SO_USELOOPBACK: + case SO_DONTROUTE: + case SO_DEBUG: + case SO_KEEPALIVE: + case SO_REUSEADDR: + case SO_REUSEPORT: + case SO_BROADCAST: + case SO_OOBINLINE: + case SO_TIMESTAMP: + case SO_NOSIGPIPE: +#ifdef SO_OTIMESTAMP + case SO_OTIMESTAMP: +#endif + error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0); + break; + + case SO_TYPE: + error = sockopt_setint(sopt, so->so_type); + break; + + case SO_ERROR: + error = sockopt_setint(sopt, so->so_error); + so->so_error = 0; + break; + + case SO_SNDBUF: + error = sockopt_setint(sopt, so->so_snd.sb_hiwat); + break; + + case SO_RCVBUF: + error = sockopt_setint(sopt, so->so_rcv.sb_hiwat); + break; + + case SO_SNDLOWAT: + error = sockopt_setint(sopt, so->so_snd.sb_lowat); + break; + + case SO_RCVLOWAT: + error = sockopt_setint(sopt, so->so_rcv.sb_lowat); + break; + +#ifdef COMPAT_50 + case SO_OSNDTIMEO: + case SO_ORCVTIMEO: { + struct timeval50 otv; + + optval = (opt == SO_OSNDTIMEO ? + so->so_snd.sb_timeo : so->so_rcv.sb_timeo); + + otv.tv_sec = optval / hz; + otv.tv_usec = (optval % hz) * tick; + + error = sockopt_set(sopt, &otv, sizeof(otv)); + break; + } +#endif /* COMPAT_50 */ + + case SO_SNDTIMEO: + case SO_RCVTIMEO: + optval = (opt == SO_SNDTIMEO ? + so->so_snd.sb_timeo : so->so_rcv.sb_timeo); + + tv.tv_sec = optval / hz; + tv.tv_usec = (optval % hz) * tick; + + error = sockopt_set(sopt, &tv, sizeof(tv)); + break; + + case SO_OVERFLOWED: + error = sockopt_setint(sopt, so->so_rcv.sb_overflowed); + break; + + default: + error = ENOPROTOOPT; + break; } -bad: - if (m) - (void) m_free(m); + return (error); } int -sogetopt(so, level, optname, mp) - struct socket *so; - int level, optname; - struct mbuf **mp; +sogetopt(struct socket *so, struct sockopt *sopt) { - struct mbuf *m; + int error; - if (level != SOL_SOCKET) { + solock(so); + if (sopt->sopt_level != SOL_SOCKET) { if (so->so_proto && so->so_proto->pr_ctloutput) { - return ((*so->so_proto->pr_ctloutput) - (PRCO_GETOPT, so, level, optname, mp)); + error = ((*so->so_proto->pr_ctloutput) + (PRCO_GETOPT, so, sopt)); } else - return (ENOPROTOOPT); + error = (ENOPROTOOPT); } else { - m = m_get(M_WAIT, MT_SOOPTS); - m->m_len = sizeof(int); + error = sogetopt1(so, sopt); + } + sounlock(so); + return (error); +} - switch (optname) { +/* + * alloc sockopt data buffer buffer + * - will be released at destroy + */ +static int +sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag) +{ - case SO_LINGER: - m->m_len = sizeof(struct linger); - mtod(m, struct linger *)->l_onoff = - so->so_options & SO_LINGER; - mtod(m, struct linger *)->l_linger = so->so_linger; - break; + KASSERT(sopt->sopt_size == 0); - case SO_USELOOPBACK: - case SO_DONTROUTE: - case SO_DEBUG: - case SO_KEEPALIVE: - case SO_REUSEADDR: - case SO_REUSEPORT: - case SO_BROADCAST: - case SO_OOBINLINE: - case SO_TIMESTAMP: - *mtod(m, int *) = so->so_options & optname; - break; + if (len > sizeof(sopt->sopt_buf)) { + sopt->sopt_data = kmem_zalloc(len, kmflag); + if (sopt->sopt_data == NULL) + return ENOMEM; + } else + sopt->sopt_data = sopt->sopt_buf; - case SO_TYPE: - *mtod(m, int *) = so->so_type; - break; + sopt->sopt_size = len; + return 0; +} - case SO_ERROR: - *mtod(m, int *) = so->so_error; - so->so_error = 0; - break; +/* + * initialise sockopt storage + * - MAY sleep during allocation + */ +void +sockopt_init(struct sockopt *sopt, int level, int name, size_t size) +{ - case SO_SNDBUF: - *mtod(m, int *) = so->so_snd.sb_hiwat; - break; + memset(sopt, 0, sizeof(*sopt)); - case SO_RCVBUF: - *mtod(m, int *) = so->so_rcv.sb_hiwat; - break; + sopt->sopt_level = level; + sopt->sopt_name = name; + (void)sockopt_alloc(sopt, size, KM_SLEEP); +} - case SO_SNDLOWAT: - *mtod(m, int *) = so->so_snd.sb_lowat; - break; +/* + * destroy sockopt storage + * - will release any held memory references + */ +void +sockopt_destroy(struct sockopt *sopt) +{ - case SO_RCVLOWAT: - *mtod(m, int *) = so->so_rcv.sb_lowat; - break; + if (sopt->sopt_data != sopt->sopt_buf) + kmem_free(sopt->sopt_data, sopt->sopt_size); - case SO_SNDTIMEO: - case SO_RCVTIMEO: - { - int val = (optname == SO_SNDTIMEO ? - so->so_snd.sb_timeo : so->so_rcv.sb_timeo); - - m->m_len = sizeof(struct timeval); - mtod(m, struct timeval *)->tv_sec = val / hz; - mtod(m, struct timeval *)->tv_usec = - (val % hz) * tick; - break; - } + memset(sopt, 0, sizeof(*sopt)); +} + +/* + * set sockopt value + * - value is copied into sockopt + * - memory is allocated when necessary, will not sleep + */ +int +sockopt_set(struct sockopt *sopt, const void *buf, size_t len) +{ + int error; + + if (sopt->sopt_size == 0) { + error = sockopt_alloc(sopt, len, KM_NOSLEEP); + if (error) + return error; + } + + KASSERT(sopt->sopt_size == len); + memcpy(sopt->sopt_data, buf, len); + return 0; +} + +/* + * common case of set sockopt integer value + */ +int +sockopt_setint(struct sockopt *sopt, int val) +{ + + return sockopt_set(sopt, &val, sizeof(int)); +} + +/* + * get sockopt value + * - correct size must be given + */ +int +sockopt_get(const struct sockopt *sopt, void *buf, size_t len) +{ + + if (sopt->sopt_size != len) + return EINVAL; + + memcpy(buf, sopt->sopt_data, len); + return 0; +} + +/* + * common case of get sockopt integer value + */ +int +sockopt_getint(const struct sockopt *sopt, int *valp) +{ + + return sockopt_get(sopt, valp, sizeof(int)); +} + +/* + * set sockopt value from mbuf + * - ONLY for legacy code + * - mbuf is released by sockopt + * - will not sleep + */ +int +sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m) +{ + size_t len; + int error; + + len = m_length(m); + + if (sopt->sopt_size == 0) { + error = sockopt_alloc(sopt, len, KM_NOSLEEP); + if (error) + return error; + } - default: - (void)m_free(m); - return (ENOPROTOOPT); + KASSERT(sopt->sopt_size == len); + m_copydata(m, 0, len, sopt->sopt_data); + m_freem(m); + + return 0; +} + +/* + * get sockopt value into mbuf + * - ONLY for legacy code + * - mbuf to be released by the caller + * - will not sleep + */ +struct mbuf * +sockopt_getmbuf(const struct sockopt *sopt) +{ + struct mbuf *m; + + if (sopt->sopt_size > MCLBYTES) + return NULL; + + m = m_get(M_DONTWAIT, MT_SOOPTS); + if (m == NULL) + return NULL; + + if (sopt->sopt_size > MLEN) { + MCLGET(m, M_DONTWAIT); + if ((m->m_flags & M_EXT) == 0) { + m_free(m); + return NULL; } - *mp = m; - return (0); } + + memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size); + m->m_len = sopt->sopt_size; + + return m; } void -sohasoutofband(so) - struct socket *so; +sohasoutofband(struct socket *so) +{ + + fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so); + selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT); +} + +static void +filt_sordetach(struct knote *kn) +{ + struct socket *so; + + so = ((file_t *)kn->kn_obj)->f_data; + solock(so); + SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); + if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) + so->so_rcv.sb_flags &= ~SB_KNOTE; + sounlock(so); +} + +/*ARGSUSED*/ +static int +filt_soread(struct knote *kn, long hint) +{ + struct socket *so; + int rv; + + so = ((file_t *)kn->kn_obj)->f_data; + if (hint != NOTE_SUBMIT) + solock(so); + kn->kn_data = so->so_rcv.sb_cc; + if (so->so_state & SS_CANTRCVMORE) { + kn->kn_flags |= EV_EOF; + kn->kn_fflags = so->so_error; + rv = 1; + } else if (so->so_error) /* temporary udp error */ + rv = 1; + else if (kn->kn_sfflags & NOTE_LOWAT) + rv = (kn->kn_data >= kn->kn_sdata); + else + rv = (kn->kn_data >= so->so_rcv.sb_lowat); + if (hint != NOTE_SUBMIT) + sounlock(so); + return rv; +} + +static void +filt_sowdetach(struct knote *kn) +{ + struct socket *so; + + so = ((file_t *)kn->kn_obj)->f_data; + solock(so); + SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); + if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) + so->so_snd.sb_flags &= ~SB_KNOTE; + sounlock(so); +} + +/*ARGSUSED*/ +static int +filt_sowrite(struct knote *kn, long hint) +{ + struct socket *so; + int rv; + + so = ((file_t *)kn->kn_obj)->f_data; + if (hint != NOTE_SUBMIT) + solock(so); + kn->kn_data = sbspace(&so->so_snd); + if (so->so_state & SS_CANTSENDMORE) { + kn->kn_flags |= EV_EOF; + kn->kn_fflags = so->so_error; + rv = 1; + } else if (so->so_error) /* temporary udp error */ + rv = 1; + else if (((so->so_state & SS_ISCONNECTED) == 0) && + (so->so_proto->pr_flags & PR_CONNREQUIRED)) + rv = 0; + else if (kn->kn_sfflags & NOTE_LOWAT) + rv = (kn->kn_data >= kn->kn_sdata); + else + rv = (kn->kn_data >= so->so_snd.sb_lowat); + if (hint != NOTE_SUBMIT) + sounlock(so); + return rv; +} + +/*ARGSUSED*/ +static int +filt_solisten(struct knote *kn, long hint) +{ + struct socket *so; + int rv; + + so = ((file_t *)kn->kn_obj)->f_data; + + /* + * Set kn_data to number of incoming connections, not + * counting partial (incomplete) connections. + */ + if (hint != NOTE_SUBMIT) + solock(so); + kn->kn_data = so->so_qlen; + rv = (kn->kn_data > 0); + if (hint != NOTE_SUBMIT) + sounlock(so); + return rv; +} + +static const struct filterops solisten_filtops = + { 1, NULL, filt_sordetach, filt_solisten }; +static const struct filterops soread_filtops = + { 1, NULL, filt_sordetach, filt_soread }; +static const struct filterops sowrite_filtops = + { 1, NULL, filt_sowdetach, filt_sowrite }; + +int +soo_kqfilter(struct file *fp, struct knote *kn) +{ + struct socket *so; + struct sockbuf *sb; + + so = ((file_t *)kn->kn_obj)->f_data; + solock(so); + switch (kn->kn_filter) { + case EVFILT_READ: + if (so->so_options & SO_ACCEPTCONN) + kn->kn_fop = &solisten_filtops; + else + kn->kn_fop = &soread_filtops; + sb = &so->so_rcv; + break; + case EVFILT_WRITE: + kn->kn_fop = &sowrite_filtops; + sb = &so->so_snd; + break; + default: + sounlock(so); + return (EINVAL); + } + SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext); + sb->sb_flags |= SB_KNOTE; + sounlock(so); + return (0); +} + +static int +sodopoll(struct socket *so, int events) +{ + int revents; + + revents = 0; + + if (events & (POLLIN | POLLRDNORM)) + if (soreadable(so)) + revents |= events & (POLLIN | POLLRDNORM); + + if (events & (POLLOUT | POLLWRNORM)) + if (sowritable(so)) + revents |= events & (POLLOUT | POLLWRNORM); + + if (events & (POLLPRI | POLLRDBAND)) + if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) + revents |= events & (POLLPRI | POLLRDBAND); + + return revents; +} + +int +sopoll(struct socket *so, int events) +{ + int revents = 0; + +#ifndef DIAGNOSTIC + /* + * Do a quick, unlocked check in expectation that the socket + * will be ready for I/O. Don't do this check if DIAGNOSTIC, + * as the solocked() assertions will fail. + */ + if ((revents = sodopoll(so, events)) != 0) + return revents; +#endif + + solock(so); + if ((revents = sodopoll(so, events)) == 0) { + if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { + selrecord(curlwp, &so->so_rcv.sb_sel); + so->so_rcv.sb_flags |= SB_NOTIFY; + } + + if (events & (POLLOUT | POLLWRNORM)) { + selrecord(curlwp, &so->so_snd.sb_sel); + so->so_snd.sb_flags |= SB_NOTIFY; + } + } + sounlock(so); + + return revents; +} + + +#include + +static int sysctl_kern_somaxkva(SYSCTLFN_PROTO); + +/* + * sysctl helper routine for kern.somaxkva. ensures that the given + * value is not too small. + * (XXX should we maybe make sure it's not too large as well?) + */ +static int +sysctl_kern_somaxkva(SYSCTLFN_ARGS) +{ + int error, new_somaxkva; + struct sysctlnode node; + + new_somaxkva = somaxkva; + node = *rnode; + node.sysctl_data = &new_somaxkva; + error = sysctl_lookup(SYSCTLFN_CALL(&node)); + if (error || newp == NULL) + return (error); + + if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */ + return (EINVAL); + + mutex_enter(&so_pendfree_lock); + somaxkva = new_somaxkva; + cv_broadcast(&socurkva_cv); + mutex_exit(&so_pendfree_lock); + + return (error); +} + +static void +sysctl_kern_somaxkva_setup(void) { - struct proc *p; - if (so->so_pgid < 0) - gsignal(-so->so_pgid, SIGURG); - else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0) - psignal(p, SIGURG); - selwakeup(&so->so_rcv.sb_sel); + KASSERT(socket_sysctllog == NULL); + sysctl_createv(&socket_sysctllog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "kern", NULL, + NULL, 0, NULL, 0, + CTL_KERN, CTL_EOL); + + sysctl_createv(&socket_sysctllog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "somaxkva", + SYSCTL_DESCR("Maximum amount of kernel memory to be " + "used for socket buffers"), + sysctl_kern_somaxkva, 0, NULL, 0, + CTL_KERN, KERN_SOMAXKVA, CTL_EOL); }