Commit | Line | Data |
---|---|---|
5afc289d | 1 | /* |
e7a3707f KB |
2 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 |
3 | * Regents of the University of California. All rights reserved. | |
5afc289d | 4 | * |
8dfebea1 | 5 | * %sccs.include.redist.c% |
2b6b6284 | 6 | * |
e7a3707f | 7 | * @(#)ip_output.c 8.1 (Berkeley) %G% |
5afc289d | 8 | */ |
6e8b2eca | 9 | |
5548a02f KB |
10 | #include <sys/param.h> |
11 | #include <sys/malloc.h> | |
12 | #include <sys/mbuf.h> | |
13 | #include <sys/errno.h> | |
14 | #include <sys/protosw.h> | |
15 | #include <sys/socket.h> | |
16 | #include <sys/socketvar.h> | |
f4d55810 | 17 | |
5548a02f KB |
18 | #include <net/if.h> |
19 | #include <net/route.h> | |
f4d55810 | 20 | |
5548a02f KB |
21 | #include <netinet/in.h> |
22 | #include <netinet/in_systm.h> | |
23 | #include <netinet/ip.h> | |
24 | #include <netinet/in_pcb.h> | |
25 | #include <netinet/in_var.h> | |
26 | #include <netinet/ip_var.h> | |
f4d55810 | 27 | |
b152d3c4 | 28 | #ifdef vax |
5548a02f | 29 | #include <machine/mtpr.h> |
b152d3c4 | 30 | #endif |
ac904f92 | 31 | |
f0bb362c KB |
32 | static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, int *)); |
33 | static void ip_mloopback | |
34 | __P((struct ifnet *, struct mbuf *, struct sockaddr_in *)); | |
53ba4464 MK |
35 | |
36 | /* | |
37 | * IP output. The packet in mbuf chain m contains a skeletal IP | |
99fe25ae MK |
38 | * header (with len, off, ttl, proto, tos, src, dst). |
39 | * The mbuf chain containing the packet will be freed. | |
40 | * The mbuf opt, if present, will not be freed. | |
53ba4464 | 41 | */ |
d6fa15c2 | 42 | int |
69d96ae2 | 43 | ip_output(m0, opt, ro, flags, imo) |
07136d15 | 44 | struct mbuf *m0; |
8a13b737 | 45 | struct mbuf *opt; |
ee787340 | 46 | struct route *ro; |
0e3f761f | 47 | int flags; |
d6fa15c2 | 48 | struct ip_moptions *imo; |
ac904f92 | 49 | { |
07136d15 | 50 | register struct ip *ip, *mhip; |
8a13b737 | 51 | register struct ifnet *ifp; |
07136d15 MK |
52 | register struct mbuf *m = m0; |
53 | register int hlen = sizeof (struct ip); | |
54 | int len, off, error = 0; | |
ee787340 | 55 | struct route iproute; |
a8671e7e | 56 | struct sockaddr_in *dst; |
60c0bb09 | 57 | struct in_ifaddr *ia; |
ac904f92 | 58 | |
73112d5c MK |
59 | #ifdef DIAGNOSTIC |
60 | if ((m->m_flags & M_PKTHDR) == 0) | |
61 | panic("ip_output no HDR"); | |
62 | #endif | |
07136d15 MK |
63 | if (opt) { |
64 | m = ip_insertoptions(m, opt, &len); | |
65 | hlen = len; | |
66 | } | |
53ba4464 | 67 | ip = mtod(m, struct ip *); |
e8d11875 | 68 | /* |
2b4b57cd | 69 | * Fill in IP header. |
e8d11875 | 70 | */ |
11928386 | 71 | if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { |
0e3f761f SL |
72 | ip->ip_v = IPVERSION; |
73 | ip->ip_off &= IP_DF; | |
74 | ip->ip_id = htons(ip_id++); | |
4adcd589 | 75 | ip->ip_hl = hlen >> 2; |
69d96ae2 | 76 | ipstat.ips_localout++; |
ea9a9897 | 77 | } else { |
53ba4464 | 78 | hlen = ip->ip_hl << 2; |
ea9a9897 | 79 | } |
8a13b737 | 80 | /* |
a13c006d | 81 | * Route packet. |
8a13b737 | 82 | */ |
ee787340 SL |
83 | if (ro == 0) { |
84 | ro = &iproute; | |
85 | bzero((caddr_t)ro, sizeof (*ro)); | |
86 | } | |
a8671e7e | 87 | dst = (struct sockaddr_in *)&ro->ro_dst; |
ccb87262 MK |
88 | /* |
89 | * If there is a cached route, | |
90 | * check that it is to the same destination | |
91 | * and is still up. If not, free it and try again. | |
92 | */ | |
93 | if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || | |
94 | dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { | |
95 | RTFREE(ro->ro_rt); | |
96 | ro->ro_rt = (struct rtentry *)0; | |
97 | } | |
ee787340 | 98 | if (ro->ro_rt == 0) { |
a8671e7e | 99 | dst->sin_family = AF_INET; |
d1f75e79 | 100 | dst->sin_len = sizeof(*dst); |
a8671e7e | 101 | dst->sin_addr = ip->ip_dst; |
d55475b1 MK |
102 | } |
103 | /* | |
104 | * If routing to interface only, | |
105 | * short circuit routing lookup. | |
106 | */ | |
09ed489e KS |
107 | #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) |
108 | #define sintosa(sin) ((struct sockaddr *)(sin)) | |
d55475b1 | 109 | if (flags & IP_ROUTETOIF) { |
09ed489e KS |
110 | if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 && |
111 | (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { | |
69d96ae2 | 112 | ipstat.ips_noroute++; |
d55475b1 MK |
113 | error = ENETUNREACH; |
114 | goto bad; | |
a13c006d | 115 | } |
d55475b1 | 116 | ifp = ia->ia_ifp; |
09ed489e | 117 | ip->ip_ttl = 1; |
d55475b1 | 118 | } else { |
d55475b1 MK |
119 | if (ro->ro_rt == 0) |
120 | rtalloc(ro); | |
76ea132e | 121 | if (ro->ro_rt == 0) { |
69d96ae2 | 122 | ipstat.ips_noroute++; |
76ea132e | 123 | error = EHOSTUNREACH; |
d55475b1 MK |
124 | goto bad; |
125 | } | |
09ed489e | 126 | ia = ifatoia(ro->ro_rt->rt_ifa); |
76ea132e | 127 | ifp = ro->ro_rt->rt_ifp; |
d55475b1 | 128 | ro->ro_rt->rt_use++; |
39e4cc50 | 129 | if (ro->ro_rt->rt_flags & RTF_GATEWAY) |
d1f75e79 | 130 | dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; |
0e3f761f | 131 | } |
d6fa15c2 KS |
132 | if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { |
133 | struct in_multi *inm; | |
134 | extern struct ifnet loif; | |
d6fa15c2 KS |
135 | |
136 | m->m_flags |= M_MCAST; | |
137 | /* | |
138 | * IP destination address is multicast. Make sure "dst" | |
139 | * still points to the address in "ro". (It may have been | |
140 | * changed to point to a gateway address, above.) | |
141 | */ | |
142 | dst = (struct sockaddr_in *)&ro->ro_dst; | |
143 | /* | |
144 | * See if the caller provided any multicast options | |
145 | */ | |
146 | if (imo != NULL) { | |
147 | ip->ip_ttl = imo->imo_multicast_ttl; | |
148 | if (imo->imo_multicast_ifp != NULL) | |
149 | ifp = imo->imo_multicast_ifp; | |
150 | } else | |
151 | ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; | |
152 | /* | |
153 | * Confirm that the outgoing interface supports multicast. | |
154 | */ | |
155 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { | |
69d96ae2 | 156 | ipstat.ips_noroute++; |
d6fa15c2 KS |
157 | error = ENETUNREACH; |
158 | goto bad; | |
159 | } | |
160 | /* | |
161 | * If source address not specified yet, use address | |
162 | * of outgoing interface. | |
163 | */ | |
164 | if (ip->ip_src.s_addr == INADDR_ANY) { | |
165 | register struct in_ifaddr *ia; | |
166 | ||
167 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
168 | if (ia->ia_ifp == ifp) { | |
169 | ip->ip_src = IA_SIN(ia)->sin_addr; | |
170 | break; | |
171 | } | |
172 | } | |
173 | ||
174 | IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm); | |
175 | if (inm != NULL && | |
176 | (imo == NULL || imo->imo_multicast_loop)) { | |
177 | /* | |
178 | * If we belong to the destination multicast group | |
179 | * on the outgoing interface, and the caller did not | |
180 | * forbid loopback, loop back a copy. | |
181 | */ | |
182 | ip_mloopback(ifp, m, dst); | |
183 | } | |
184 | #ifdef MROUTING | |
a8865269 | 185 | else { |
d6fa15c2 KS |
186 | /* |
187 | * If we are acting as a multicast router, perform | |
188 | * multicast forwarding as if the packet had just | |
189 | * arrived on the interface to which we are about | |
190 | * to send. The multicast forwarding function | |
191 | * recursively calls this function, using the | |
192 | * IP_FORWARDING flag to prevent infinite recursion. | |
193 | * | |
194 | * Multicasts that are looped back by ip_mloopback(), | |
195 | * above, will be forwarded by the ip_input() routine, | |
196 | * if necessary. | |
197 | */ | |
a8865269 KS |
198 | extern struct socket *ip_mrouter; |
199 | if (ip_mrouter && (flags & IP_FORWARDING) == 0) { | |
200 | if (ip_mforward(m, ifp) != 0) { | |
201 | m_freem(m); | |
202 | goto done; | |
203 | } | |
d6fa15c2 KS |
204 | } |
205 | } | |
206 | #endif | |
207 | /* | |
208 | * Multicasts with a time-to-live of zero may be looped- | |
209 | * back, above, but must not be transmitted on a network. | |
210 | * Also, multicasts addressed to the loopback interface | |
211 | * are not sent -- the above call to ip_mloopback() will | |
212 | * loop back a copy if this host actually belongs to the | |
213 | * destination group on the loopback interface. | |
214 | */ | |
215 | if (ip->ip_ttl == 0 || ifp == &loif) { | |
216 | m_freem(m); | |
217 | goto done; | |
218 | } | |
219 | ||
220 | goto sendit; | |
221 | } | |
5afc289d MK |
222 | #ifndef notdef |
223 | /* | |
224 | * If source address not specified yet, use address | |
225 | * of outgoing interface. | |
226 | */ | |
60c0bb09 KS |
227 | if (ip->ip_src.s_addr == INADDR_ANY) |
228 | ip->ip_src = IA_SIN(ia)->sin_addr; | |
5afc289d | 229 | #endif |
a13c006d | 230 | /* |
af099287 SL |
231 | * Look for broadcast address and |
232 | * and verify user is allowed to send | |
19f96414 | 233 | * such a packet. |
a13c006d | 234 | */ |
09ed489e | 235 | if (in_broadcast(dst->sin_addr, ifp)) { |
19f96414 SL |
236 | if ((ifp->if_flags & IFF_BROADCAST) == 0) { |
237 | error = EADDRNOTAVAIL; | |
238 | goto bad; | |
239 | } | |
0e3f761f | 240 | if ((flags & IP_ALLOWBROADCAST) == 0) { |
a13c006d | 241 | error = EACCES; |
ee787340 | 242 | goto bad; |
8a2f82db | 243 | } |
19f96414 | 244 | /* don't allow broadcast messages to be fragmented */ |
5c82f140 | 245 | if ((u_short)ip->ip_len > ifp->if_mtu) { |
19f96414 SL |
246 | error = EMSGSIZE; |
247 | goto bad; | |
248 | } | |
d1f75e79 | 249 | m->m_flags |= M_BCAST; |
69d96ae2 AC |
250 | } else |
251 | m->m_flags &= ~M_BCAST; | |
ac904f92 | 252 | |
d6fa15c2 | 253 | sendit: |
2b4b57cd BJ |
254 | /* |
255 | * If small enough for interface, can just send directly. | |
256 | */ | |
5c82f140 | 257 | if ((u_short)ip->ip_len <= ifp->if_mtu) { |
8a13b737 BJ |
258 | ip->ip_len = htons((u_short)ip->ip_len); |
259 | ip->ip_off = htons((u_short)ip->ip_off); | |
260 | ip->ip_sum = 0; | |
261 | ip->ip_sum = in_cksum(m, hlen); | |
60c0bb09 KS |
262 | error = (*ifp->if_output)(ifp, m, |
263 | (struct sockaddr *)dst, ro->ro_rt); | |
a13c006d | 264 | goto done; |
cdad2eb1 | 265 | } |
2b4b57cd BJ |
266 | /* |
267 | * Too large for interface; fragment if possible. | |
268 | * Must be able to put at least 8 bytes per fragment. | |
269 | */ | |
8a2f82db SL |
270 | if (ip->ip_off & IP_DF) { |
271 | error = EMSGSIZE; | |
69d96ae2 | 272 | ipstat.ips_cantfrag++; |
2b4b57cd | 273 | goto bad; |
8a2f82db | 274 | } |
8a13b737 | 275 | len = (ifp->if_mtu - hlen) &~ 7; |
8a2f82db SL |
276 | if (len < 8) { |
277 | error = EMSGSIZE; | |
2b4b57cd | 278 | goto bad; |
8a2f82db | 279 | } |
2b4b57cd | 280 | |
e537fed1 MK |
281 | { |
282 | int mhlen, firstlen = len; | |
d1f75e79 | 283 | struct mbuf **mnext = &m->m_nextpkt; |
e537fed1 | 284 | |
2b4b57cd | 285 | /* |
e537fed1 MK |
286 | * Loop through length of segment after first fragment, |
287 | * make new header and copy data of each part and link onto chain. | |
2b4b57cd | 288 | */ |
07136d15 | 289 | m0 = m; |
e537fed1 | 290 | mhlen = sizeof (struct ip); |
5c82f140 | 291 | for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { |
d1f75e79 | 292 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
07136d15 | 293 | if (m == 0) { |
8a2f82db | 294 | error = ENOBUFS; |
69d96ae2 | 295 | ipstat.ips_odropped++; |
f688491d | 296 | goto sendorfree; |
8a2f82db | 297 | } |
d1f75e79 | 298 | m->m_data += max_linkhdr; |
07136d15 | 299 | mhip = mtod(m, struct ip *); |
2b4b57cd | 300 | *mhip = *ip; |
4ad99bae | 301 | if (hlen > sizeof (struct ip)) { |
e537fed1 | 302 | mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); |
07136d15 | 303 | mhip->ip_hl = mhlen >> 2; |
e537fed1 | 304 | } |
07136d15 | 305 | m->m_len = mhlen; |
e537fed1 | 306 | mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF); |
4adcd589 MK |
307 | if (ip->ip_off & IP_MF) |
308 | mhip->ip_off |= IP_MF; | |
5c82f140 MK |
309 | if (off + len >= (u_short)ip->ip_len) |
310 | len = (u_short)ip->ip_len - off; | |
07136d15 | 311 | else |
2b4b57cd | 312 | mhip->ip_off |= IP_MF; |
07136d15 MK |
313 | mhip->ip_len = htons((u_short)(len + mhlen)); |
314 | m->m_next = m_copy(m0, off, len); | |
315 | if (m->m_next == 0) { | |
de5e5c79 | 316 | (void) m_free(m); |
8a2f82db | 317 | error = ENOBUFS; /* ??? */ |
69d96ae2 | 318 | ipstat.ips_odropped++; |
e537fed1 | 319 | goto sendorfree; |
98444525 | 320 | } |
d1f75e79 MK |
321 | m->m_pkthdr.len = mhlen + len; |
322 | m->m_pkthdr.rcvif = (struct ifnet *)0; | |
0b49870f | 323 | mhip->ip_off = htons((u_short)mhip->ip_off); |
0b49870f | 324 | mhip->ip_sum = 0; |
07136d15 | 325 | mhip->ip_sum = in_cksum(m, mhlen); |
e537fed1 | 326 | *mnext = m; |
d1f75e79 | 327 | mnext = &m->m_nextpkt; |
ea9a9897 | 328 | ipstat.ips_ofragments++; |
2b4b57cd | 329 | } |
e537fed1 MK |
330 | /* |
331 | * Update first fragment by trimming what's been copied out | |
332 | * and updating header, then send each fragment (in order). | |
333 | */ | |
9d14dd83 | 334 | m = m0; |
5c82f140 | 335 | m_adj(m, hlen + firstlen - (u_short)ip->ip_len); |
d1f75e79 MK |
336 | m->m_pkthdr.len = hlen + firstlen; |
337 | ip->ip_len = htons((u_short)m->m_pkthdr.len); | |
4ee97dd8 | 338 | ip->ip_off = htons((u_short)(ip->ip_off | IP_MF)); |
e537fed1 | 339 | ip->ip_sum = 0; |
9d14dd83 | 340 | ip->ip_sum = in_cksum(m, hlen); |
e537fed1 MK |
341 | sendorfree: |
342 | for (m = m0; m; m = m0) { | |
d1f75e79 MK |
343 | m0 = m->m_nextpkt; |
344 | m->m_nextpkt = 0; | |
e537fed1 MK |
345 | if (error == 0) |
346 | error = (*ifp->if_output)(ifp, m, | |
60c0bb09 | 347 | (struct sockaddr *)dst, ro->ro_rt); |
e537fed1 MK |
348 | else |
349 | m_freem(m); | |
350 | } | |
69d96ae2 AC |
351 | |
352 | if (error == 0) | |
353 | ipstat.ips_fragmented++; | |
e537fed1 | 354 | } |
a13c006d | 355 | done: |
0e3f761f | 356 | if (ro == &iproute && (flags & IP_ROUTETOIF) == 0 && ro->ro_rt) |
a13c006d | 357 | RTFREE(ro->ro_rt); |
8a2f82db | 358 | return (error); |
e537fed1 MK |
359 | bad: |
360 | m_freem(m0); | |
361 | goto done; | |
2b4b57cd BJ |
362 | } |
363 | ||
53ba4464 MK |
364 | /* |
365 | * Insert IP options into preformed packet. | |
366 | * Adjust IP destination as required for IP source routing, | |
367 | * as indicated by a non-zero in_addr at the start of the options. | |
368 | */ | |
f0bb362c | 369 | static struct mbuf * |
53ba4464 MK |
370 | ip_insertoptions(m, opt, phlen) |
371 | register struct mbuf *m; | |
372 | struct mbuf *opt; | |
373 | int *phlen; | |
374 | { | |
375 | register struct ipoption *p = mtod(opt, struct ipoption *); | |
376 | struct mbuf *n; | |
377 | register struct ip *ip = mtod(m, struct ip *); | |
8011f5df | 378 | unsigned optlen; |
53ba4464 MK |
379 | |
380 | optlen = opt->m_len - sizeof(p->ipopt_dst); | |
5c82f140 MK |
381 | if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) |
382 | return (m); /* XXX should fail */ | |
53ba4464 MK |
383 | if (p->ipopt_dst.s_addr) |
384 | ip->ip_dst = p->ipopt_dst; | |
d1f75e79 MK |
385 | if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { |
386 | MGETHDR(n, M_DONTWAIT, MT_HEADER); | |
53ba4464 MK |
387 | if (n == 0) |
388 | return (m); | |
d1f75e79 | 389 | n->m_pkthdr.len = m->m_pkthdr.len + optlen; |
53ba4464 | 390 | m->m_len -= sizeof(struct ip); |
d1f75e79 | 391 | m->m_data += sizeof(struct ip); |
53ba4464 MK |
392 | n->m_next = m; |
393 | m = n; | |
53ba4464 | 394 | m->m_len = optlen + sizeof(struct ip); |
d1f75e79 | 395 | m->m_data += max_linkhdr; |
53ba4464 MK |
396 | bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); |
397 | } else { | |
d1f75e79 | 398 | m->m_data -= optlen; |
53ba4464 | 399 | m->m_len += optlen; |
d1f75e79 | 400 | m->m_pkthdr.len += optlen; |
53ba4464 MK |
401 | ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); |
402 | } | |
403 | ip = mtod(m, struct ip *); | |
8011f5df | 404 | bcopy((caddr_t)p->ipopt_list, (caddr_t)(ip + 1), (unsigned)optlen); |
53ba4464 MK |
405 | *phlen = sizeof(struct ip) + optlen; |
406 | ip->ip_len += optlen; | |
407 | return (m); | |
408 | } | |
409 | ||
2b4b57cd | 410 | /* |
e537fed1 MK |
411 | * Copy options from ip to jp, |
412 | * omitting those not copied during fragmentation. | |
2b4b57cd | 413 | */ |
d6fa15c2 | 414 | int |
e537fed1 | 415 | ip_optcopy(ip, jp) |
2b4b57cd | 416 | struct ip *ip, *jp; |
2b4b57cd BJ |
417 | { |
418 | register u_char *cp, *dp; | |
419 | int opt, optlen, cnt; | |
420 | ||
421 | cp = (u_char *)(ip + 1); | |
422 | dp = (u_char *)(jp + 1); | |
423 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); | |
424 | for (; cnt > 0; cnt -= optlen, cp += optlen) { | |
425 | opt = cp[0]; | |
426 | if (opt == IPOPT_EOL) | |
427 | break; | |
69d96ae2 AC |
428 | if (opt == IPOPT_NOP) { |
429 | /* Preserve for IP mcast tunnel's LSRR alignment. */ | |
430 | *dp++ = IPOPT_NOP; | |
2b4b57cd | 431 | optlen = 1; |
69d96ae2 AC |
432 | continue; |
433 | } else | |
53ba4464 | 434 | optlen = cp[IPOPT_OLEN]; |
e537fed1 MK |
435 | /* bogus lengths should have been caught by ip_dooptions */ |
436 | if (optlen > cnt) | |
437 | optlen = cnt; | |
438 | if (IPOPT_COPIED(opt)) { | |
4ad99bae | 439 | bcopy((caddr_t)cp, (caddr_t)dp, (unsigned)optlen); |
2b4b57cd | 440 | dp += optlen; |
ac904f92 | 441 | } |
e8d11875 | 442 | } |
2b4b57cd BJ |
443 | for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) |
444 | *dp++ = IPOPT_EOL; | |
445 | return (optlen); | |
ac904f92 | 446 | } |
53ba4464 MK |
447 | |
448 | /* | |
449 | * IP socket option processing. | |
450 | */ | |
d6fa15c2 | 451 | int |
76ea132e | 452 | ip_ctloutput(op, so, level, optname, mp) |
53ba4464 MK |
453 | int op; |
454 | struct socket *so; | |
455 | int level, optname; | |
76ea132e | 456 | struct mbuf **mp; |
53ba4464 | 457 | { |
76ea132e MK |
458 | register struct inpcb *inp = sotoinpcb(so); |
459 | register struct mbuf *m = *mp; | |
460 | register int optval; | |
53ba4464 | 461 | int error = 0; |
53ba4464 MK |
462 | |
463 | if (level != IPPROTO_IP) | |
a1e9cf6e | 464 | goto freeit; |
53ba4464 MK |
465 | else switch (op) { |
466 | ||
467 | case PRCO_SETOPT: | |
468 | switch (optname) { | |
469 | case IP_OPTIONS: | |
73112d5c | 470 | #ifdef notyet |
76ea132e MK |
471 | case IP_RETOPTS: |
472 | return (ip_pcbopts(optname, &inp->inp_options, m)); | |
73112d5c MK |
473 | #else |
474 | return (ip_pcbopts(&inp->inp_options, m)); | |
475 | #endif | |
76ea132e MK |
476 | |
477 | case IP_TOS: | |
478 | case IP_TTL: | |
479 | case IP_RECVOPTS: | |
480 | case IP_RECVRETOPTS: | |
481 | case IP_RECVDSTADDR: | |
482 | if (m->m_len != sizeof(int)) | |
483 | error = EINVAL; | |
484 | else { | |
485 | optval = *mtod(m, int *); | |
73112d5c | 486 | switch (optname) { |
76ea132e MK |
487 | |
488 | case IP_TOS: | |
489 | inp->inp_ip.ip_tos = optval; | |
490 | break; | |
491 | ||
492 | case IP_TTL: | |
6f908ea9 | 493 | inp->inp_ip.ip_ttl = optval; |
76ea132e MK |
494 | break; |
495 | #define OPTSET(bit) \ | |
496 | if (optval) \ | |
497 | inp->inp_flags |= bit; \ | |
498 | else \ | |
499 | inp->inp_flags &= ~bit; | |
500 | ||
501 | case IP_RECVOPTS: | |
502 | OPTSET(INP_RECVOPTS); | |
503 | break; | |
504 | ||
505 | case IP_RECVRETOPTS: | |
506 | OPTSET(INP_RECVRETOPTS); | |
507 | break; | |
508 | ||
509 | case IP_RECVDSTADDR: | |
510 | OPTSET(INP_RECVDSTADDR); | |
511 | break; | |
512 | } | |
513 | } | |
514 | break; | |
515 | #undef OPTSET | |
53ba4464 | 516 | |
d6fa15c2 KS |
517 | case IP_MULTICAST_IF: |
518 | case IP_MULTICAST_TTL: | |
519 | case IP_MULTICAST_LOOP: | |
520 | case IP_ADD_MEMBERSHIP: | |
521 | case IP_DROP_MEMBERSHIP: | |
522 | error = ip_setmoptions(optname, &inp->inp_moptions, m); | |
523 | break; | |
d6fa15c2 | 524 | |
a1e9cf6e | 525 | freeit: |
53ba4464 MK |
526 | default: |
527 | error = EINVAL; | |
528 | break; | |
529 | } | |
76ea132e MK |
530 | if (m) |
531 | (void)m_free(m); | |
53ba4464 MK |
532 | break; |
533 | ||
534 | case PRCO_GETOPT: | |
535 | switch (optname) { | |
536 | case IP_OPTIONS: | |
73112d5c | 537 | case IP_RETOPTS: |
76ea132e | 538 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
53ba4464 | 539 | if (inp->inp_options) { |
76ea132e | 540 | m->m_len = inp->inp_options->m_len; |
53ba4464 | 541 | bcopy(mtod(inp->inp_options, caddr_t), |
76ea132e | 542 | mtod(m, caddr_t), (unsigned)m->m_len); |
53ba4464 | 543 | } else |
76ea132e MK |
544 | m->m_len = 0; |
545 | break; | |
546 | ||
547 | case IP_TOS: | |
548 | case IP_TTL: | |
549 | case IP_RECVOPTS: | |
550 | case IP_RECVRETOPTS: | |
551 | case IP_RECVDSTADDR: | |
552 | *mp = m = m_get(M_WAIT, MT_SOOPTS); | |
553 | m->m_len = sizeof(int); | |
73112d5c | 554 | switch (optname) { |
76ea132e MK |
555 | |
556 | case IP_TOS: | |
557 | optval = inp->inp_ip.ip_tos; | |
558 | break; | |
559 | ||
560 | case IP_TTL: | |
6f908ea9 | 561 | optval = inp->inp_ip.ip_ttl; |
76ea132e MK |
562 | break; |
563 | ||
564 | #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) | |
565 | ||
566 | case IP_RECVOPTS: | |
567 | optval = OPTBIT(INP_RECVOPTS); | |
568 | break; | |
569 | ||
570 | case IP_RECVRETOPTS: | |
571 | optval = OPTBIT(INP_RECVRETOPTS); | |
572 | break; | |
573 | ||
574 | case IP_RECVDSTADDR: | |
575 | optval = OPTBIT(INP_RECVDSTADDR); | |
576 | break; | |
577 | } | |
578 | *mtod(m, int *) = optval; | |
53ba4464 | 579 | break; |
76ea132e | 580 | |
d6fa15c2 KS |
581 | case IP_MULTICAST_IF: |
582 | case IP_MULTICAST_TTL: | |
583 | case IP_MULTICAST_LOOP: | |
584 | case IP_ADD_MEMBERSHIP: | |
585 | case IP_DROP_MEMBERSHIP: | |
586 | error = ip_getmoptions(optname, inp->inp_moptions, mp); | |
587 | break; | |
d6fa15c2 | 588 | |
53ba4464 MK |
589 | default: |
590 | error = EINVAL; | |
591 | break; | |
592 | } | |
593 | break; | |
594 | } | |
53ba4464 MK |
595 | return (error); |
596 | } | |
597 | ||
598 | /* | |
0c3fb1b4 MK |
599 | * Set up IP options in pcb for insertion in output packets. |
600 | * Store in mbuf with pointer in pcbopt, adding pseudo-option | |
601 | * with destination address if source routed. | |
53ba4464 | 602 | */ |
d6fa15c2 | 603 | int |
73112d5c MK |
604 | #ifdef notyet |
605 | ip_pcbopts(optname, pcbopt, m) | |
606 | int optname; | |
607 | #else | |
0c3fb1b4 | 608 | ip_pcbopts(pcbopt, m) |
73112d5c | 609 | #endif |
0c3fb1b4 MK |
610 | struct mbuf **pcbopt; |
611 | register struct mbuf *m; | |
53ba4464 MK |
612 | { |
613 | register cnt, optlen; | |
614 | register u_char *cp; | |
615 | u_char opt; | |
616 | ||
617 | /* turn off any old options */ | |
0c3fb1b4 | 618 | if (*pcbopt) |
8011f5df | 619 | (void)m_free(*pcbopt); |
0c3fb1b4 | 620 | *pcbopt = 0; |
53ba4464 MK |
621 | if (m == (struct mbuf *)0 || m->m_len == 0) { |
622 | /* | |
623 | * Only turning off any previous options. | |
624 | */ | |
625 | if (m) | |
8011f5df | 626 | (void)m_free(m); |
53ba4464 MK |
627 | return (0); |
628 | } | |
629 | ||
630 | #ifndef vax | |
631 | if (m->m_len % sizeof(long)) | |
632 | goto bad; | |
633 | #endif | |
634 | /* | |
635 | * IP first-hop destination address will be stored before | |
636 | * actual options; move other options back | |
637 | * and clear it when none present. | |
638 | */ | |
d1f75e79 | 639 | if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) |
53ba4464 | 640 | goto bad; |
53ba4464 MK |
641 | cnt = m->m_len; |
642 | m->m_len += sizeof(struct in_addr); | |
643 | cp = mtod(m, u_char *) + sizeof(struct in_addr); | |
8011f5df | 644 | ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); |
53ba4464 MK |
645 | bzero(mtod(m, caddr_t), sizeof(struct in_addr)); |
646 | ||
647 | for (; cnt > 0; cnt -= optlen, cp += optlen) { | |
648 | opt = cp[IPOPT_OPTVAL]; | |
649 | if (opt == IPOPT_EOL) | |
650 | break; | |
651 | if (opt == IPOPT_NOP) | |
652 | optlen = 1; | |
653 | else { | |
654 | optlen = cp[IPOPT_OLEN]; | |
655 | if (optlen <= IPOPT_OLEN || optlen > cnt) | |
656 | goto bad; | |
657 | } | |
658 | switch (opt) { | |
659 | ||
660 | default: | |
661 | break; | |
662 | ||
663 | case IPOPT_LSRR: | |
664 | case IPOPT_SSRR: | |
665 | /* | |
666 | * user process specifies route as: | |
667 | * ->A->B->C->D | |
668 | * D must be our final destination (but we can't | |
669 | * check that since we may not have connected yet). | |
670 | * A is first hop destination, which doesn't appear in | |
671 | * actual IP option, but is stored before the options. | |
672 | */ | |
673 | if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) | |
674 | goto bad; | |
675 | m->m_len -= sizeof(struct in_addr); | |
676 | cnt -= sizeof(struct in_addr); | |
677 | optlen -= sizeof(struct in_addr); | |
678 | cp[IPOPT_OLEN] = optlen; | |
679 | /* | |
680 | * Move first hop before start of options. | |
681 | */ | |
8011f5df | 682 | bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), |
53ba4464 MK |
683 | sizeof(struct in_addr)); |
684 | /* | |
685 | * Then copy rest of options back | |
686 | * to close up the deleted entry. | |
687 | */ | |
8011f5df MK |
688 | ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + |
689 | sizeof(struct in_addr)), | |
690 | (caddr_t)&cp[IPOPT_OFFSET+1], | |
691 | (unsigned)cnt + sizeof(struct in_addr)); | |
53ba4464 MK |
692 | break; |
693 | } | |
694 | } | |
d1f75e79 MK |
695 | if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) |
696 | goto bad; | |
0c3fb1b4 | 697 | *pcbopt = m; |
53ba4464 MK |
698 | return (0); |
699 | ||
700 | bad: | |
8011f5df | 701 | (void)m_free(m); |
53ba4464 MK |
702 | return (EINVAL); |
703 | } | |
d6fa15c2 | 704 | |
d6fa15c2 KS |
705 | /* |
706 | * Set the IP multicast options in response to user setsockopt(). | |
707 | */ | |
708 | int | |
709 | ip_setmoptions(optname, imop, m) | |
710 | int optname; | |
711 | struct ip_moptions **imop; | |
712 | struct mbuf *m; | |
713 | { | |
714 | register int error = 0; | |
715 | u_char loop; | |
716 | register int i; | |
717 | struct in_addr addr; | |
718 | register struct ip_mreq *mreq; | |
719 | register struct ifnet *ifp; | |
720 | register struct ip_moptions *imo = *imop; | |
721 | struct route ro; | |
722 | register struct sockaddr_in *dst; | |
723 | ||
724 | if (imo == NULL) { | |
725 | /* | |
726 | * No multicast option buffer attached to the pcb; | |
727 | * allocate one and initialize to default values. | |
728 | */ | |
729 | imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, | |
730 | M_WAITOK); | |
731 | ||
732 | if (imo == NULL) | |
733 | return (ENOBUFS); | |
734 | *imop = imo; | |
735 | imo->imo_multicast_ifp = NULL; | |
736 | imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; | |
737 | imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; | |
738 | imo->imo_num_memberships = 0; | |
739 | } | |
740 | ||
741 | switch (optname) { | |
742 | ||
743 | case IP_MULTICAST_IF: | |
744 | /* | |
745 | * Select the interface for outgoing multicast packets. | |
746 | */ | |
747 | if (m == NULL || m->m_len != sizeof(struct in_addr)) { | |
748 | error = EINVAL; | |
749 | break; | |
750 | } | |
751 | addr = *(mtod(m, struct in_addr *)); | |
752 | /* | |
753 | * INADDR_ANY is used to remove a previous selection. | |
754 | * When no interface is selected, a default one is | |
755 | * chosen every time a multicast packet is sent. | |
756 | */ | |
757 | if (addr.s_addr == INADDR_ANY) { | |
758 | imo->imo_multicast_ifp = NULL; | |
759 | break; | |
760 | } | |
761 | /* | |
762 | * The selected interface is identified by its local | |
763 | * IP address. Find the interface and confirm that | |
764 | * it supports multicasting. | |
765 | */ | |
766 | INADDR_TO_IFP(addr, ifp); | |
767 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { | |
768 | error = EADDRNOTAVAIL; | |
769 | break; | |
770 | } | |
771 | imo->imo_multicast_ifp = ifp; | |
772 | break; | |
773 | ||
774 | case IP_MULTICAST_TTL: | |
775 | /* | |
776 | * Set the IP time-to-live for outgoing multicast packets. | |
777 | */ | |
778 | if (m == NULL || m->m_len != 1) { | |
779 | error = EINVAL; | |
780 | break; | |
781 | } | |
782 | imo->imo_multicast_ttl = *(mtod(m, u_char *)); | |
783 | break; | |
784 | ||
785 | case IP_MULTICAST_LOOP: | |
786 | /* | |
787 | * Set the loopback flag for outgoing multicast packets. | |
788 | * Must be zero or one. | |
789 | */ | |
790 | if (m == NULL || m->m_len != 1 || | |
791 | (loop = *(mtod(m, u_char *))) > 1) { | |
792 | error = EINVAL; | |
793 | break; | |
794 | } | |
795 | imo->imo_multicast_loop = loop; | |
796 | break; | |
797 | ||
798 | case IP_ADD_MEMBERSHIP: | |
799 | /* | |
800 | * Add a multicast group membership. | |
801 | * Group must be a valid IP multicast address. | |
802 | */ | |
803 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { | |
804 | error = EINVAL; | |
805 | break; | |
806 | } | |
807 | mreq = mtod(m, struct ip_mreq *); | |
808 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { | |
809 | error = EINVAL; | |
810 | break; | |
811 | } | |
812 | /* | |
813 | * If no interface address was provided, use the interface of | |
814 | * the route to the given multicast address. | |
815 | */ | |
816 | if (mreq->imr_interface.s_addr == INADDR_ANY) { | |
817 | ro.ro_rt = NULL; | |
818 | dst = (struct sockaddr_in *)&ro.ro_dst; | |
819 | dst->sin_len = sizeof(*dst); | |
820 | dst->sin_family = AF_INET; | |
821 | dst->sin_addr = mreq->imr_multiaddr; | |
822 | rtalloc(&ro); | |
823 | if (ro.ro_rt == NULL) { | |
824 | error = EADDRNOTAVAIL; | |
825 | break; | |
826 | } | |
827 | ifp = ro.ro_rt->rt_ifp; | |
828 | rtfree(ro.ro_rt); | |
829 | } | |
830 | else { | |
831 | INADDR_TO_IFP(mreq->imr_interface, ifp); | |
832 | } | |
833 | /* | |
834 | * See if we found an interface, and confirm that it | |
835 | * supports multicast. | |
836 | */ | |
837 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { | |
838 | error = EADDRNOTAVAIL; | |
839 | break; | |
840 | } | |
841 | /* | |
842 | * See if the membership already exists or if all the | |
843 | * membership slots are full. | |
844 | */ | |
845 | for (i = 0; i < imo->imo_num_memberships; ++i) { | |
846 | if (imo->imo_membership[i]->inm_ifp == ifp && | |
847 | imo->imo_membership[i]->inm_addr.s_addr | |
848 | == mreq->imr_multiaddr.s_addr) | |
849 | break; | |
850 | } | |
851 | if (i < imo->imo_num_memberships) { | |
852 | error = EADDRINUSE; | |
853 | break; | |
854 | } | |
855 | if (i == IP_MAX_MEMBERSHIPS) { | |
856 | error = ETOOMANYREFS; | |
857 | break; | |
858 | } | |
859 | /* | |
860 | * Everything looks good; add a new record to the multicast | |
861 | * address list for the given interface. | |
862 | */ | |
863 | if ((imo->imo_membership[i] = | |
864 | in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) { | |
865 | error = ENOBUFS; | |
866 | break; | |
867 | } | |
868 | ++imo->imo_num_memberships; | |
869 | break; | |
870 | ||
871 | case IP_DROP_MEMBERSHIP: | |
872 | /* | |
873 | * Drop a multicast group membership. | |
874 | * Group must be a valid IP multicast address. | |
875 | */ | |
876 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { | |
877 | error = EINVAL; | |
878 | break; | |
879 | } | |
880 | mreq = mtod(m, struct ip_mreq *); | |
881 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { | |
882 | error = EINVAL; | |
883 | break; | |
884 | } | |
885 | /* | |
886 | * If an interface address was specified, get a pointer | |
887 | * to its ifnet structure. | |
888 | */ | |
889 | if (mreq->imr_interface.s_addr == INADDR_ANY) | |
890 | ifp = NULL; | |
891 | else { | |
892 | INADDR_TO_IFP(mreq->imr_interface, ifp); | |
893 | if (ifp == NULL) { | |
894 | error = EADDRNOTAVAIL; | |
895 | break; | |
896 | } | |
897 | } | |
898 | /* | |
899 | * Find the membership in the membership array. | |
900 | */ | |
901 | for (i = 0; i < imo->imo_num_memberships; ++i) { | |
902 | if ((ifp == NULL || | |
903 | imo->imo_membership[i]->inm_ifp == ifp) && | |
904 | imo->imo_membership[i]->inm_addr.s_addr == | |
905 | mreq->imr_multiaddr.s_addr) | |
906 | break; | |
907 | } | |
908 | if (i == imo->imo_num_memberships) { | |
909 | error = EADDRNOTAVAIL; | |
910 | break; | |
911 | } | |
912 | /* | |
913 | * Give up the multicast address record to which the | |
914 | * membership points. | |
915 | */ | |
916 | in_delmulti(imo->imo_membership[i]); | |
917 | /* | |
918 | * Remove the gap in the membership array. | |
919 | */ | |
920 | for (++i; i < imo->imo_num_memberships; ++i) | |
921 | imo->imo_membership[i-1] = imo->imo_membership[i]; | |
922 | --imo->imo_num_memberships; | |
923 | break; | |
924 | ||
925 | default: | |
926 | error = EOPNOTSUPP; | |
927 | break; | |
928 | } | |
929 | ||
930 | /* | |
931 | * If all options have default values, no need to keep the mbuf. | |
932 | */ | |
933 | if (imo->imo_multicast_ifp == NULL && | |
934 | imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && | |
935 | imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && | |
936 | imo->imo_num_memberships == 0) { | |
937 | free(*imop, M_IPMOPTS); | |
938 | *imop = NULL; | |
939 | } | |
940 | ||
941 | return (error); | |
942 | } | |
943 | ||
944 | /* | |
945 | * Return the IP multicast options in response to user getsockopt(). | |
946 | */ | |
947 | int | |
948 | ip_getmoptions(optname, imo, mp) | |
949 | int optname; | |
950 | register struct ip_moptions *imo; | |
951 | register struct mbuf **mp; | |
952 | { | |
953 | u_char *ttl; | |
954 | u_char *loop; | |
955 | struct in_addr *addr; | |
956 | struct in_ifaddr *ia; | |
957 | ||
958 | *mp = m_get(M_WAIT, MT_SOOPTS); | |
959 | ||
960 | switch (optname) { | |
961 | ||
962 | case IP_MULTICAST_IF: | |
963 | addr = mtod(*mp, struct in_addr *); | |
964 | (*mp)->m_len = sizeof(struct in_addr); | |
965 | if (imo == NULL || imo->imo_multicast_ifp == NULL) | |
966 | addr->s_addr = INADDR_ANY; | |
967 | else { | |
968 | IFP_TO_IA(imo->imo_multicast_ifp, ia); | |
969 | addr->s_addr = (ia == NULL) ? INADDR_ANY | |
970 | : IA_SIN(ia)->sin_addr.s_addr; | |
971 | } | |
972 | return (0); | |
973 | ||
974 | case IP_MULTICAST_TTL: | |
975 | ttl = mtod(*mp, u_char *); | |
976 | (*mp)->m_len = 1; | |
977 | *ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL | |
978 | : imo->imo_multicast_ttl; | |
979 | return (0); | |
980 | ||
981 | case IP_MULTICAST_LOOP: | |
982 | loop = mtod(*mp, u_char *); | |
983 | (*mp)->m_len = 1; | |
984 | *loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP | |
985 | : imo->imo_multicast_loop; | |
986 | return (0); | |
987 | ||
988 | default: | |
989 | return (EOPNOTSUPP); | |
990 | } | |
991 | } | |
992 | ||
993 | /* | |
994 | * Discard the IP multicast options. | |
995 | */ | |
996 | void | |
997 | ip_freemoptions(imo) | |
998 | register struct ip_moptions *imo; | |
999 | { | |
1000 | register int i; | |
1001 | ||
1002 | if (imo != NULL) { | |
1003 | for (i = 0; i < imo->imo_num_memberships; ++i) | |
1004 | in_delmulti(imo->imo_membership[i]); | |
1005 | free(imo, M_IPMOPTS); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Routine called from ip_output() to loop back a copy of an IP multicast | |
1011 | * packet to the input queue of a specified interface. Note that this | |
1012 | * calls the output routine of the loopback "driver", but with an interface | |
1013 | * pointer that might NOT be &loif -- easier than replicating that code here. | |
1014 | */ | |
1015 | static void | |
1016 | ip_mloopback(ifp, m, dst) | |
1017 | struct ifnet *ifp; | |
1018 | register struct mbuf *m; | |
1019 | register struct sockaddr_in *dst; | |
1020 | { | |
1021 | register struct ip *ip; | |
1022 | struct mbuf *copym; | |
1023 | ||
1024 | copym = m_copy(m, 0, M_COPYALL); | |
1025 | if (copym != NULL) { | |
1026 | /* | |
1027 | * We don't bother to fragment if the IP length is greater | |
1028 | * than the interface's MTU. Can this possibly matter? | |
1029 | */ | |
1030 | ip = mtod(copym, struct ip *); | |
1031 | ip->ip_len = htons((u_short)ip->ip_len); | |
1032 | ip->ip_off = htons((u_short)ip->ip_off); | |
1033 | ip->ip_sum = 0; | |
1034 | ip->ip_sum = in_cksum(copym, ip->ip_hl << 2); | |
f0bb362c | 1035 | (void) looutput(ifp, copym, (struct sockaddr *)dst, NULL); |
d6fa15c2 KS |
1036 | } |
1037 | } |