Annotation of src/sys/netinet/raw_ip.c, Revision 1.14
1.14 ! cgd 1: /* $NetBSD$ */
! 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 &&
98: inp->inp_laddr.s_addr == ip->ip_dst.s_addr)
99: continue;
100: if (inp->inp_faddr.s_addr &&
101: inp->inp_faddr.s_addr == ip->ip_src.s_addr)
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:
185: if (level != IPPROTO_IP)
1.13 mycroft 186: return (EINVAL);
1.1 cgd 187:
1.13 mycroft 188: switch (optname) {
1.1 cgd 189:
1.13 mycroft 190: case IP_HDRINCL:
191: if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
192: if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
193: return (EINVAL);
194: if (op == PRCO_SETOPT) {
195: if (*mtod(*m, int *))
196: inp->inp_flags |= INP_HDRINCL;
197: else
198: inp->inp_flags &= ~INP_HDRINCL;
199: (void)m_free(*m);
200: } else {
201: (*m)->m_len = sizeof (int);
202: *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
203: }
204: return (0);
205: }
206: break;
1.1 cgd 207:
1.13 mycroft 208: case DVMRP_INIT:
209: case DVMRP_DONE:
210: case DVMRP_ADD_VIF:
211: case DVMRP_DEL_VIF:
212: case DVMRP_ADD_LGRP:
213: case DVMRP_DEL_LGRP:
214: case DVMRP_ADD_MRT:
215: case DVMRP_DEL_MRT:
1.6 hpeyerl 216: #ifdef MROUTING
1.13 mycroft 217: if (op == PRCO_SETOPT) {
1.6 hpeyerl 218: error = ip_mrouter_cmd(optname, so, *m);
1.13 mycroft 219: if (*m)
220: (void)m_free(*m);
221: } else
222: error = EINVAL;
223: return (error);
1.6 hpeyerl 224: #else
1.13 mycroft 225: if (op == PRCO_SETOPT && *m)
226: (void)m_free(*m);
227: return (EOPNOTSUPP);
1.6 hpeyerl 228: #endif
1.1 cgd 229: }
1.13 mycroft 230: return (ip_ctloutput(op, so, level, optname, m));
1.1 cgd 231: }
232:
1.13 mycroft 233: u_long rip_sendspace = RIPSNDQ;
234: u_long rip_recvspace = RIPRCVQ;
235:
1.1 cgd 236: /*ARGSUSED*/
1.9 mycroft 237: int
1.2 cgd 238: rip_usrreq(so, req, m, nam, control)
1.1 cgd 239: register struct socket *so;
240: int req;
1.2 cgd 241: struct mbuf *m, *nam, *control;
1.1 cgd 242: {
243: register int error = 0;
1.13 mycroft 244: register struct inpcb *inp = sotoinpcb(so);
245: #ifdef MROUTING
1.6 hpeyerl 246: extern struct socket *ip_mrouter;
247: #endif
1.1 cgd 248: switch (req) {
249:
250: case PRU_ATTACH:
1.13 mycroft 251: if (inp)
1.1 cgd 252: panic("rip_attach");
1.13 mycroft 253: if ((so->so_state & SS_PRIV) == 0) {
254: error = EACCES;
255: break;
256: }
257: if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
258: (error = in_pcballoc(so, &rawinpcb)))
259: break;
260: inp = (struct inpcb *)so->so_pcb;
261: inp->inp_ip.ip_p = (int)nam;
1.1 cgd 262: break;
263:
1.13 mycroft 264: case PRU_DISCONNECT:
265: if ((so->so_state & SS_ISCONNECTED) == 0) {
266: error = ENOTCONN;
267: break;
268: }
269: /* FALLTHROUGH */
270: case PRU_ABORT:
271: soisdisconnected(so);
272: /* FALLTHROUGH */
1.1 cgd 273: case PRU_DETACH:
1.13 mycroft 274: if (inp == 0)
1.1 cgd 275: panic("rip_detach");
1.13 mycroft 276: #ifdef MROUTING
1.6 hpeyerl 277: if (so == ip_mrouter)
278: ip_mrouter_done();
279: #endif
1.13 mycroft 280: in_pcbdetach(inp);
1.1 cgd 281: break;
282:
283: case PRU_BIND:
284: {
285: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
286:
1.13 mycroft 287: if (nam->m_len != sizeof(*addr)) {
288: error = EINVAL;
289: break;
290: }
1.1 cgd 291: if ((ifnet == 0) ||
292: ((addr->sin_family != AF_INET) &&
293: (addr->sin_family != AF_IMPLINK)) ||
294: (addr->sin_addr.s_addr &&
1.13 mycroft 295: ifa_ifwithaddr((struct sockaddr *)addr) == 0)) {
296: error = EADDRNOTAVAIL;
297: break;
298: }
299: inp->inp_laddr = addr->sin_addr;
300: break;
1.1 cgd 301: }
302: case PRU_CONNECT:
303: {
304: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
305:
1.13 mycroft 306: if (nam->m_len != sizeof(*addr)) {
307: error = EINVAL;
308: break;
309: }
310: if (ifnet == 0) {
311: error = EADDRNOTAVAIL;
312: break;
313: }
1.1 cgd 314: if ((addr->sin_family != AF_INET) &&
1.13 mycroft 315: (addr->sin_family != AF_IMPLINK)) {
316: error = EAFNOSUPPORT;
317: break;
318: }
319: inp->inp_faddr = addr->sin_addr;
1.1 cgd 320: soisconnected(so);
1.13 mycroft 321: break;
322: }
323:
324: case PRU_CONNECT2:
325: error = EOPNOTSUPP;
326: break;
327:
328: /*
329: * Mark the connection as being incapable of further input.
330: */
331: case PRU_SHUTDOWN:
332: socantsendmore(so);
333: break;
334:
335: /*
336: * Ship a packet out. The appropriate raw output
337: * routine handles any massaging necessary.
338: */
339: case PRU_SEND:
340: {
341: register u_long dst;
342:
343: if (so->so_state & SS_ISCONNECTED) {
344: if (nam) {
345: error = EISCONN;
346: break;
347: }
348: dst = inp->inp_faddr.s_addr;
349: } else {
350: if (nam == NULL) {
351: error = ENOTCONN;
352: break;
353: }
354: dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
355: }
356: error = rip_output(m, so, dst);
357: m = NULL;
358: break;
359: }
360:
361: case PRU_SENSE:
362: /*
363: * stat: don't bother with a blocksize.
364: */
1.1 cgd 365: return (0);
1.13 mycroft 366:
367: /*
368: * Not supported.
369: */
370: case PRU_RCVOOB:
371: case PRU_RCVD:
372: case PRU_LISTEN:
373: case PRU_ACCEPT:
374: case PRU_SENDOOB:
375: error = EOPNOTSUPP;
376: break;
377:
378: case PRU_SOCKADDR:
379: in_setsockaddr(inp, nam);
380: break;
381:
382: case PRU_PEERADDR:
383: in_setpeeraddr(inp, nam);
384: break;
385:
386: default:
387: panic("rip_usrreq");
1.1 cgd 388: }
1.13 mycroft 389: if (m != NULL)
390: m_freem(m);
1.1 cgd 391: return (error);
392: }
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