Annotation of src/sys/netinet/raw_ip.c, Revision 1.17
1.17 ! cgd 1: /* $NetBSD: raw_ip.c,v 1.16 1995/03/02 09:33:40 glass Exp $ */
1.14 cgd 2:
1.1 cgd 3: /*
1.13 mycroft 4: * Copyright (c) 1982, 1986, 1988, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
1.14 cgd 35: * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
1.1 cgd 36: */
37:
1.7 mycroft 38: #include <sys/param.h>
39: #include <sys/malloc.h>
40: #include <sys/mbuf.h>
41: #include <sys/socket.h>
42: #include <sys/protosw.h>
43: #include <sys/socketvar.h>
44: #include <sys/errno.h>
1.13 mycroft 45: #include <sys/systm.h>
1.1 cgd 46:
1.7 mycroft 47: #include <net/if.h>
48: #include <net/route.h>
1.1 cgd 49:
1.7 mycroft 50: #include <netinet/in.h>
51: #include <netinet/in_systm.h>
52: #include <netinet/ip.h>
53: #include <netinet/ip_var.h>
1.13 mycroft 54: #include <netinet/ip_mroute.h>
1.7 mycroft 55: #include <netinet/in_pcb.h>
1.13 mycroft 56:
57: struct inpcb rawinpcb;
58:
59: /*
60: * Nominal space allocated to a raw ip socket.
61: */
62: #define RIPSNDQ 8192
63: #define RIPRCVQ 8192
1.1 cgd 64:
65: /*
66: * Raw interface to IP protocol.
67: */
1.13 mycroft 68:
69: /*
70: * Initialize raw connection block q.
71: */
72: void
73: rip_init()
74: {
75:
76: rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb;
77: }
78:
1.1 cgd 79: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
80: /*
81: * Setup generic address and protocol structures
82: * for raw_input routine, then pass them along with
83: * mbuf chain.
84: */
1.9 mycroft 85: void
1.1 cgd 86: rip_input(m)
87: struct mbuf *m;
88: {
89: register struct ip *ip = mtod(m, struct ip *);
1.13 mycroft 90: register struct inpcb *inp;
91: struct socket *last = 0;
1.1 cgd 92:
93: ripsrc.sin_addr = ip->ip_src;
1.13 mycroft 94: for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) {
95: if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
96: continue;
97: if (inp->inp_laddr.s_addr &&
1.16 glass 98: inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
1.13 mycroft 99: continue;
100: if (inp->inp_faddr.s_addr &&
1.16 glass 101: inp->inp_faddr.s_addr != ip->ip_src.s_addr)
1.13 mycroft 102: continue;
103: if (last) {
104: struct mbuf *n;
105: if (n = m_copy(m, 0, (int)M_COPYALL)) {
106: if (sbappendaddr(&last->so_rcv,
107: (struct sockaddr *)&ripsrc,
108: n, (struct mbuf *)0) == 0)
109: /* should notify about lost packet */
110: m_freem(n);
111: else
112: sorwakeup(last);
113: }
114: }
115: last = inp->inp_socket;
116: }
117: if (last) {
118: if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc,
119: m, (struct mbuf *)0) == 0)
120: m_freem(m);
121: else
122: sorwakeup(last);
123: } else {
124: m_freem(m);
1.1 cgd 125: ipstat.ips_noproto++;
126: ipstat.ips_delivered--;
127: }
128: }
129:
130: /*
131: * Generate IP header and pass packet to ip_output.
132: * Tack on options user may have setup with control call.
133: */
1.9 mycroft 134: int
1.13 mycroft 135: rip_output(m, so, dst)
1.1 cgd 136: register struct mbuf *m;
137: struct socket *so;
1.13 mycroft 138: u_long dst;
1.1 cgd 139: {
140: register struct ip *ip;
1.13 mycroft 141: register struct inpcb *inp = sotoinpcb(so);
1.10 mycroft 142: struct mbuf *opts;
1.13 mycroft 143: int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
1.1 cgd 144:
145: /*
146: * If the user handed us a complete IP packet, use it.
147: * Otherwise, allocate an mbuf for a header and fill it in.
148: */
1.13 mycroft 149: if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.1 cgd 150: M_PREPEND(m, sizeof(struct ip), M_WAIT);
151: ip = mtod(m, struct ip *);
152: ip->ip_tos = 0;
153: ip->ip_off = 0;
1.13 mycroft 154: ip->ip_p = inp->inp_ip.ip_p;
1.1 cgd 155: ip->ip_len = m->m_pkthdr.len;
1.13 mycroft 156: ip->ip_src = inp->inp_laddr;
157: ip->ip_dst.s_addr = dst;
1.1 cgd 158: ip->ip_ttl = MAXTTL;
1.13 mycroft 159: opts = inp->inp_options;
160: } else {
161: ip = mtod(m, struct ip *);
162: if (ip->ip_id == 0)
163: ip->ip_id = htons(ip_id++);
164: opts = NULL;
165: /* XXX prevent ip_output from overwriting header fields */
166: flags |= IP_RAWOUTPUT;
167: ipstat.ips_rawout++;
1.1 cgd 168: }
1.13 mycroft 169: return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
1.1 cgd 170: }
171:
172: /*
173: * Raw IP socket option processing.
174: */
1.9 mycroft 175: int
1.1 cgd 176: rip_ctloutput(op, so, level, optname, m)
177: int op;
178: struct socket *so;
179: int level, optname;
180: struct mbuf **m;
181: {
1.13 mycroft 182: register struct inpcb *inp = sotoinpcb(so);
183: register int error;
1.1 cgd 184:
1.15 mycroft 185: if (level != IPPROTO_IP) {
186: if (m != 0 && *m != 0)
187: (void)m_free(*m);
1.13 mycroft 188: return (EINVAL);
1.15 mycroft 189: }
1.1 cgd 190:
1.13 mycroft 191: switch (optname) {
1.1 cgd 192:
1.13 mycroft 193: case IP_HDRINCL:
194: if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
195: if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
196: return (EINVAL);
197: if (op == PRCO_SETOPT) {
198: if (*mtod(*m, int *))
199: inp->inp_flags |= INP_HDRINCL;
200: else
201: inp->inp_flags &= ~INP_HDRINCL;
202: (void)m_free(*m);
203: } else {
204: (*m)->m_len = sizeof (int);
205: *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
206: }
207: return (0);
208: }
209: break;
1.1 cgd 210:
1.13 mycroft 211: case DVMRP_INIT:
212: case DVMRP_DONE:
213: case DVMRP_ADD_VIF:
214: case DVMRP_DEL_VIF:
215: case DVMRP_ADD_LGRP:
216: case DVMRP_DEL_LGRP:
217: case DVMRP_ADD_MRT:
218: case DVMRP_DEL_MRT:
1.6 hpeyerl 219: #ifdef MROUTING
1.13 mycroft 220: if (op == PRCO_SETOPT) {
1.6 hpeyerl 221: error = ip_mrouter_cmd(optname, so, *m);
1.13 mycroft 222: if (*m)
223: (void)m_free(*m);
224: } else
225: error = EINVAL;
226: return (error);
1.6 hpeyerl 227: #else
1.13 mycroft 228: if (op == PRCO_SETOPT && *m)
229: (void)m_free(*m);
230: return (EOPNOTSUPP);
1.6 hpeyerl 231: #endif
1.1 cgd 232: }
1.13 mycroft 233: return (ip_ctloutput(op, so, level, optname, m));
1.1 cgd 234: }
235:
1.13 mycroft 236: u_long rip_sendspace = RIPSNDQ;
237: u_long rip_recvspace = RIPRCVQ;
238:
1.1 cgd 239: /*ARGSUSED*/
1.9 mycroft 240: int
1.2 cgd 241: rip_usrreq(so, req, m, nam, control)
1.1 cgd 242: register struct socket *so;
243: int req;
1.2 cgd 244: struct mbuf *m, *nam, *control;
1.1 cgd 245: {
246: register int error = 0;
1.13 mycroft 247: register struct inpcb *inp = sotoinpcb(so);
248: #ifdef MROUTING
1.6 hpeyerl 249: extern struct socket *ip_mrouter;
250: #endif
1.1 cgd 251: switch (req) {
252:
253: case PRU_ATTACH:
1.13 mycroft 254: if (inp)
1.1 cgd 255: panic("rip_attach");
1.13 mycroft 256: if ((so->so_state & SS_PRIV) == 0) {
257: error = EACCES;
258: break;
259: }
260: if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
261: (error = in_pcballoc(so, &rawinpcb)))
262: break;
263: inp = (struct inpcb *)so->so_pcb;
1.17 ! cgd 264: inp->inp_ip.ip_p = (long)nam;
1.1 cgd 265: break;
266:
1.13 mycroft 267: case PRU_DISCONNECT:
268: if ((so->so_state & SS_ISCONNECTED) == 0) {
269: error = ENOTCONN;
270: break;
271: }
272: /* FALLTHROUGH */
273: case PRU_ABORT:
274: soisdisconnected(so);
275: /* FALLTHROUGH */
1.1 cgd 276: case PRU_DETACH:
1.13 mycroft 277: if (inp == 0)
1.1 cgd 278: panic("rip_detach");
1.13 mycroft 279: #ifdef MROUTING
1.6 hpeyerl 280: if (so == ip_mrouter)
281: ip_mrouter_done();
282: #endif
1.13 mycroft 283: in_pcbdetach(inp);
1.1 cgd 284: break;
285:
286: case PRU_BIND:
287: {
288: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
289:
1.13 mycroft 290: if (nam->m_len != sizeof(*addr)) {
291: error = EINVAL;
292: break;
293: }
1.1 cgd 294: if ((ifnet == 0) ||
295: ((addr->sin_family != AF_INET) &&
296: (addr->sin_family != AF_IMPLINK)) ||
297: (addr->sin_addr.s_addr &&
1.13 mycroft 298: ifa_ifwithaddr((struct sockaddr *)addr) == 0)) {
299: error = EADDRNOTAVAIL;
300: break;
301: }
302: inp->inp_laddr = addr->sin_addr;
303: break;
1.1 cgd 304: }
305: case PRU_CONNECT:
306: {
307: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
308:
1.13 mycroft 309: if (nam->m_len != sizeof(*addr)) {
310: error = EINVAL;
311: break;
312: }
313: if (ifnet == 0) {
314: error = EADDRNOTAVAIL;
315: break;
316: }
1.1 cgd 317: if ((addr->sin_family != AF_INET) &&
1.13 mycroft 318: (addr->sin_family != AF_IMPLINK)) {
319: error = EAFNOSUPPORT;
320: break;
321: }
322: inp->inp_faddr = addr->sin_addr;
1.1 cgd 323: soisconnected(so);
1.13 mycroft 324: break;
325: }
326:
327: case PRU_CONNECT2:
328: error = EOPNOTSUPP;
329: break;
330:
331: /*
332: * Mark the connection as being incapable of further input.
333: */
334: case PRU_SHUTDOWN:
335: socantsendmore(so);
336: break;
337:
338: /*
339: * Ship a packet out. The appropriate raw output
340: * routine handles any massaging necessary.
341: */
342: case PRU_SEND:
343: {
1.17 ! cgd 344: register u_int32_t dst;
1.13 mycroft 345:
346: if (so->so_state & SS_ISCONNECTED) {
347: if (nam) {
348: error = EISCONN;
349: break;
350: }
351: dst = inp->inp_faddr.s_addr;
352: } else {
353: if (nam == NULL) {
354: error = ENOTCONN;
355: break;
356: }
357: dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
358: }
359: error = rip_output(m, so, dst);
360: m = NULL;
361: break;
362: }
363:
364: case PRU_SENSE:
365: /*
366: * stat: don't bother with a blocksize.
367: */
1.1 cgd 368: return (0);
1.13 mycroft 369:
370: /*
371: * Not supported.
372: */
373: case PRU_RCVOOB:
374: case PRU_RCVD:
375: case PRU_LISTEN:
376: case PRU_ACCEPT:
377: case PRU_SENDOOB:
378: error = EOPNOTSUPP;
379: break;
380:
381: case PRU_SOCKADDR:
382: in_setsockaddr(inp, nam);
383: break;
384:
385: case PRU_PEERADDR:
386: in_setpeeraddr(inp, nam);
387: break;
388:
389: default:
390: panic("rip_usrreq");
1.1 cgd 391: }
1.13 mycroft 392: if (m != NULL)
393: m_freem(m);
1.1 cgd 394: return (error);
395: }
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