1: /* setsockopt functions
2: * Copyright (C) 1999 Kunihiro Ishiguro
3: *
4: * This file is part of GNU Zebra.
5: *
6: * GNU Zebra is free software; you can redistribute it and/or modify it
7: * under the terms of the GNU General Public License as published by the
8: * Free Software Foundation; either version 2, or (at your option) any
9: * later version.
10: *
11: * GNU Zebra is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License
17: * along with GNU Zebra; see the file COPYING. If not, write to the Free
18: * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19: * 02111-1307, USA.
20: */
21:
22: #include <zebra.h>
23: #include "log.h"
24: #include "sockopt.h"
25: #include "sockunion.h"
26:
27: int
28: setsockopt_so_recvbuf (int sock, int size)
29: {
30: int ret;
31:
32: if ( (ret = setsockopt (sock, SOL_SOCKET, SO_RCVBUF, (char *)
33: &size, sizeof (int))) < 0)
34: zlog_err ("fd %d: can't setsockopt SO_RCVBUF to %d: %s",
35: sock,size,safe_strerror(errno));
36:
37: return ret;
38: }
39:
40: int
41: setsockopt_so_sendbuf (const int sock, int size)
42: {
43: int ret = setsockopt (sock, SOL_SOCKET, SO_SNDBUF,
44: (char *)&size, sizeof (int));
45:
46: if (ret < 0)
47: zlog_err ("fd %d: can't setsockopt SO_SNDBUF to %d: %s",
48: sock, size, safe_strerror (errno));
49:
50: return ret;
51: }
52:
53: int
54: getsockopt_so_sendbuf (const int sock)
55: {
56: u_int32_t optval;
57: socklen_t optlen = sizeof (optval);
58: int ret = getsockopt (sock, SOL_SOCKET, SO_SNDBUF,
59: (char *)&optval, &optlen);
60: if (ret < 0)
61: {
62: zlog_err ("fd %d: can't getsockopt SO_SNDBUF: %d (%s)",
63: sock, errno, safe_strerror (errno));
64: return ret;
65: }
66: return optval;
67: }
68:
69: static void *
70: getsockopt_cmsg_data (struct msghdr *msgh, int level, int type)
71: {
72: struct cmsghdr *cmsg;
73: void *ptr = NULL;
74:
75: for (cmsg = ZCMSG_FIRSTHDR(msgh);
76: cmsg != NULL;
77: cmsg = CMSG_NXTHDR(msgh, cmsg))
78: if (cmsg->cmsg_level == level && cmsg->cmsg_type)
79: return (ptr = CMSG_DATA(cmsg));
80:
81: return NULL;
82: }
83:
84: #ifdef HAVE_IPV6
85: /* Set IPv6 packet info to the socket. */
86: int
87: setsockopt_ipv6_pktinfo (int sock, int val)
88: {
89: int ret;
90:
91: #ifdef IPV6_RECVPKTINFO /*2292bis-01*/
92: ret = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val));
93: if (ret < 0)
94: zlog_warn ("can't setsockopt IPV6_RECVPKTINFO : %s", safe_strerror (errno));
95: #else /*RFC2292*/
96: ret = setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &val, sizeof(val));
97: if (ret < 0)
98: zlog_warn ("can't setsockopt IPV6_PKTINFO : %s", safe_strerror (errno));
99: #endif /* INIA_IPV6 */
100: return ret;
101: }
102:
103: /* Set multicast hops val to the socket. */
104: int
105: setsockopt_ipv6_checksum (int sock, int val)
106: {
107: int ret;
108:
109: #ifdef GNU_LINUX
110: ret = setsockopt(sock, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val));
111: #else
112: ret = setsockopt(sock, IPPROTO_IPV6, IPV6_CHECKSUM, &val, sizeof(val));
113: #endif /* GNU_LINUX */
114: if (ret < 0)
115: zlog_warn ("can't setsockopt IPV6_CHECKSUM");
116: return ret;
117: }
118:
119: /* Set multicast hops val to the socket. */
120: int
121: setsockopt_ipv6_multicast_hops (int sock, int val)
122: {
123: int ret;
124:
125: ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, sizeof(val));
126: if (ret < 0)
127: zlog_warn ("can't setsockopt IPV6_MULTICAST_HOPS");
128: return ret;
129: }
130:
131: /* Set multicast hops val to the socket. */
132: int
133: setsockopt_ipv6_unicast_hops (int sock, int val)
134: {
135: int ret;
136:
137: ret = setsockopt(sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &val, sizeof(val));
138: if (ret < 0)
139: zlog_warn ("can't setsockopt IPV6_UNICAST_HOPS");
140: return ret;
141: }
142:
143: int
144: setsockopt_ipv6_hoplimit (int sock, int val)
145: {
146: int ret;
147:
148: #ifdef IPV6_RECVHOPLIMIT /*2292bis-01*/
149: ret = setsockopt (sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &val, sizeof(val));
150: if (ret < 0)
151: zlog_warn ("can't setsockopt IPV6_RECVHOPLIMIT");
152: #else /*RFC2292*/
153: ret = setsockopt (sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &val, sizeof(val));
154: if (ret < 0)
155: zlog_warn ("can't setsockopt IPV6_HOPLIMIT");
156: #endif
157: return ret;
158: }
159:
160: /* Set multicast loop zero to the socket. */
161: int
162: setsockopt_ipv6_multicast_loop (int sock, int val)
163: {
164: int ret;
165:
166: ret = setsockopt (sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val,
167: sizeof (val));
168: if (ret < 0)
169: zlog_warn ("can't setsockopt IPV6_MULTICAST_LOOP");
170: return ret;
171: }
172:
173: static int
174: getsockopt_ipv6_ifindex (struct msghdr *msgh)
175: {
176: struct in6_pktinfo *pktinfo;
177:
178: pktinfo = getsockopt_cmsg_data (msgh, IPPROTO_IPV6, IPV6_PKTINFO);
179:
180: return pktinfo->ipi6_ifindex;
181: }
182: #endif /* HAVE_IPV6 */
183:
184:
185: /*
186: * Process multicast socket options for IPv4 in an OS-dependent manner.
187: * Supported options are IP_{ADD,DROP}_MEMBERSHIP.
188: *
189: * Many operating systems have a limit on the number of groups that
190: * can be joined per socket (where each group and local address
191: * counts). This impacts OSPF, which joins groups on each interface
192: * using a single socket. The limit is typically 20, derived from the
193: * original BSD multicast implementation. Some systems have
194: * mechanisms for increasing this limit.
195: *
196: * In many 4.4BSD-derived systems, multicast group operations are not
197: * allowed on interfaces that are not UP. Thus, a previous attempt to
198: * leave the group may have failed, leaving it still joined, and we
199: * drop/join quietly to recover. This may not be necessary, but aims to
200: * defend against unknown behavior in that we will still return an error
201: * if the second join fails. It is not clear how other systems
202: * (e.g. Linux, Solaris) behave when leaving groups on down interfaces,
203: * but this behavior should not be harmful if they behave the same way,
204: * allow leaves, or implicitly leave all groups joined to down interfaces.
205: */
206: int
207: setsockopt_ipv4_multicast(int sock,
208: int optname,
209: unsigned int mcast_addr,
210: unsigned int ifindex)
211: {
212: #ifdef HAVE_RFC3678
213: struct group_req gr;
214: struct sockaddr_in *si;
215: int ret;
216: memset (&gr, 0, sizeof(gr));
217: si = (struct sockaddr_in *)&gr.gr_group;
218: gr.gr_interface = ifindex;
219: si->sin_family = AF_INET;
220: #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
221: si->sin_len = sizeof(struct sockaddr_in);
222: #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
223: si->sin_addr.s_addr = mcast_addr;
224: ret = setsockopt(sock, IPPROTO_IP, (optname == IP_ADD_MEMBERSHIP) ?
225: MCAST_JOIN_GROUP : MCAST_LEAVE_GROUP, (void *)&gr, sizeof(gr));
226: if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP) && (errno == EADDRINUSE))
227: {
228: setsockopt(sock, IPPROTO_IP, MCAST_LEAVE_GROUP, (void *)&gr, sizeof(gr));
229: ret = setsockopt(sock, IPPROTO_IP, MCAST_JOIN_GROUP, (void *)&gr, sizeof(gr));
230: }
231: return ret;
232:
233: #elif defined(HAVE_STRUCT_IP_MREQN_IMR_IFINDEX) && !defined(__FreeBSD__)
234: struct ip_mreqn mreqn;
235: int ret;
236:
237: assert(optname == IP_ADD_MEMBERSHIP || optname == IP_DROP_MEMBERSHIP);
238: memset (&mreqn, 0, sizeof(mreqn));
239:
240: mreqn.imr_multiaddr.s_addr = mcast_addr;
241: mreqn.imr_ifindex = ifindex;
242:
243: ret = setsockopt(sock, IPPROTO_IP, optname,
244: (void *)&mreqn, sizeof(mreqn));
245: if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP) && (errno == EADDRINUSE))
246: {
247: /* see above: handle possible problem when interface comes back up */
248: char buf[1][INET_ADDRSTRLEN];
249: zlog_info("setsockopt_ipv4_multicast attempting to drop and "
250: "re-add (fd %d, mcast %s, ifindex %u)",
251: sock,
252: inet_ntop(AF_INET, &mreqn.imr_multiaddr,
253: buf[0], sizeof(buf[0])), ifindex);
254: setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP,
255: (void *)&mreqn, sizeof(mreqn));
256: ret = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
257: (void *)&mreqn, sizeof(mreqn));
258: }
259: return ret;
260:
261: /* Example defines for another OS, boilerplate off other code in this
262: function, AND handle optname as per other sections for consistency !! */
263: /* #elif defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
264: /* Add your favourite OS here! */
265:
266: #elif defined(HAVE_BSD_STRUCT_IP_MREQ_HACK) /* #if OS_TYPE */
267: /* standard BSD API */
268:
269: struct in_addr m;
270: struct ip_mreq mreq;
271: int ret;
272:
273: assert(optname == IP_ADD_MEMBERSHIP || optname == IP_DROP_MEMBERSHIP);
274:
275: m.s_addr = htonl(ifindex);
276:
277: memset (&mreq, 0, sizeof(mreq));
278: mreq.imr_multiaddr.s_addr = mcast_addr;
279: mreq.imr_interface = m;
280:
281: ret = setsockopt (sock, IPPROTO_IP, optname, (void *)&mreq, sizeof(mreq));
282: if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP) && (errno == EADDRINUSE))
283: {
284: /* see above: handle possible problem when interface comes back up */
285: char buf[1][INET_ADDRSTRLEN];
286: zlog_info("setsockopt_ipv4_multicast attempting to drop and "
287: "re-add (fd %d, mcast %s, ifindex %u)",
288: sock,
289: inet_ntop(AF_INET, &mreq.imr_multiaddr,
290: buf[0], sizeof(buf[0])), ifindex);
291: setsockopt (sock, IPPROTO_IP, IP_DROP_MEMBERSHIP,
292: (void *)&mreq, sizeof(mreq));
293: ret = setsockopt (sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
294: (void *)&mreq, sizeof(mreq));
295: }
296: return ret;
297:
298: #else
299: #error "Unsupported multicast API"
300: #endif /* #if OS_TYPE */
301:
302: }
303:
304: /*
305: * Set IP_MULTICAST_IF socket option in an OS-dependent manner.
306: */
307: int
308: setsockopt_ipv4_multicast_if(int sock,
309: unsigned int ifindex)
310: {
311:
312: #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
313: struct ip_mreqn mreqn;
314: memset (&mreqn, 0, sizeof(mreqn));
315:
316: mreqn.imr_ifindex = ifindex;
317: return setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, (void *)&mreqn, sizeof(mreqn));
318:
319: /* Example defines for another OS, boilerplate off other code in this
320: function */
321: /* #elif defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
322: /* Add your favourite OS here! */
323: #elif defined(HAVE_BSD_STRUCT_IP_MREQ_HACK)
324: struct in_addr m;
325:
326: m.s_addr = htonl(ifindex);
327:
328: return setsockopt (sock, IPPROTO_IP, IP_MULTICAST_IF, (void *)&m, sizeof(m));
329: #else
330: #error "Unsupported multicast API"
331: #endif
332: }
333:
334: static int
335: setsockopt_ipv4_ifindex (int sock, int val)
336: {
337: int ret;
338:
339: #if defined (IP_PKTINFO)
340: if ((ret = setsockopt (sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof (val))) < 0)
341: zlog_warn ("Can't set IP_PKTINFO option for fd %d to %d: %s",
342: sock,val,safe_strerror(errno));
343: #elif defined (IP_RECVIF)
344: if ((ret = setsockopt (sock, IPPROTO_IP, IP_RECVIF, &val, sizeof (val))) < 0)
345: zlog_warn ("Can't set IP_RECVIF option for fd %d to %d: %s",
346: sock,val,safe_strerror(errno));
347: #else
348: #warning "Neither IP_PKTINFO nor IP_RECVIF is available."
349: #warning "Will not be able to receive link info."
350: #warning "Things might be seriously broken.."
351: /* XXX Does this ever happen? Should there be a zlog_warn message here? */
352: ret = -1;
353: #endif
354: return ret;
355: }
356:
357: int
358: setsockopt_ipv4_tos(int sock, int tos)
359: {
360: int ret;
361:
362: ret = setsockopt (sock, IPPROTO_IP, IP_TOS, &tos, sizeof (tos));
363: if (ret < 0)
364: zlog_warn ("Can't set IP_TOS option for fd %d to %#x: %s",
365: sock, tos, safe_strerror(errno));
366: return ret;
367: }
368:
369:
370: int
371: setsockopt_ifindex (int af, int sock, int val)
372: {
373: int ret = -1;
374:
375: switch (af)
376: {
377: case AF_INET:
378: ret = setsockopt_ipv4_ifindex (sock, val);
379: break;
380: #ifdef HAVE_IPV6
381: case AF_INET6:
382: ret = setsockopt_ipv6_pktinfo (sock, val);
383: break;
384: #endif
385: default:
386: zlog_warn ("setsockopt_ifindex: unknown address family %d", af);
387: }
388: return ret;
389: }
390:
391: /*
392: * Requires: msgh is not NULL and points to a valid struct msghdr, which
393: * may or may not have control data about the incoming interface.
394: *
395: * Returns the interface index (small integer >= 1) if it can be
396: * determined, or else 0.
397: */
398: static int
399: getsockopt_ipv4_ifindex (struct msghdr *msgh)
400: {
401: /* XXX: initialize to zero? (Always overwritten, so just cosmetic.) */
402: int ifindex = -1;
403:
404: #if defined(IP_PKTINFO)
405: /* Linux pktinfo based ifindex retrieval */
406: struct in_pktinfo *pktinfo;
407:
408: pktinfo =
409: (struct in_pktinfo *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_PKTINFO);
410: /* XXX Can pktinfo be NULL? Clean up post 0.98. */
411: ifindex = pktinfo->ipi_ifindex;
412:
413: #elif defined(IP_RECVIF)
414:
415: /* retrieval based on IP_RECVIF */
416:
417: #ifndef SUNOS_5
418: /* BSD systems use a sockaddr_dl as the control message payload. */
419: struct sockaddr_dl *sdl;
420: #else
421: /* SUNOS_5 uses an integer with the index. */
422: int *ifindex_p;
423: #endif /* SUNOS_5 */
424:
425: #ifndef SUNOS_5
426: /* BSD */
427: sdl =
428: (struct sockaddr_dl *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF);
429: if (sdl != NULL)
430: ifindex = sdl->sdl_index;
431: else
432: ifindex = 0;
433: #else
434: /*
435: * Solaris. On Solaris 8, IP_RECVIF is defined, but the call to
436: * enable it fails with errno=99, and the struct msghdr has
437: * controllen 0.
438: */
439: ifindex_p = (uint_t *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF);
440: if (ifindex_p != NULL)
441: ifindex = *ifindex_p;
442: else
443: ifindex = 0;
444: #endif /* SUNOS_5 */
445:
446: #else
447: /*
448: * Neither IP_PKTINFO nor IP_RECVIF defined - warn at compile time.
449: * XXX Decide if this is a core service, or if daemons have to cope.
450: * Since Solaris 8 and OpenBSD seem not to provide it, it seems that
451: * daemons have to cope.
452: */
453: #warning "getsockopt_ipv4_ifindex: Neither IP_PKTINFO nor IP_RECVIF defined."
454: #warning "Some daemons may fail to operate correctly!"
455: ifindex = 0;
456:
457: #endif /* IP_PKTINFO */
458:
459: return ifindex;
460: }
461:
462: /* return ifindex, 0 if none found */
463: int
464: getsockopt_ifindex (int af, struct msghdr *msgh)
465: {
466: switch (af)
467: {
468: case AF_INET:
469: return (getsockopt_ipv4_ifindex (msgh));
470: break;
471: #ifdef HAVE_IPV6
472: case AF_INET6:
473: return (getsockopt_ipv6_ifindex (msgh));
474: break;
475: #endif
476: default:
477: zlog_warn ("getsockopt_ifindex: unknown address family %d", af);
478: return 0;
479: }
480: }
481:
482: /* swab iph between order system uses for IP_HDRINCL and host order */
483: void
484: sockopt_iphdrincl_swab_htosys (struct ip *iph)
485: {
486: /* BSD and derived take iph in network order, except for
487: * ip_len and ip_off
488: */
489: #ifndef HAVE_IP_HDRINCL_BSD_ORDER
490: iph->ip_len = htons(iph->ip_len);
491: iph->ip_off = htons(iph->ip_off);
492: #endif /* HAVE_IP_HDRINCL_BSD_ORDER */
493:
494: iph->ip_id = htons(iph->ip_id);
495: }
496:
497: void
498: sockopt_iphdrincl_swab_systoh (struct ip *iph)
499: {
500: #ifndef HAVE_IP_HDRINCL_BSD_ORDER
501: iph->ip_len = ntohs(iph->ip_len);
502: iph->ip_off = ntohs(iph->ip_off);
503: #endif /* HAVE_IP_HDRINCL_BSD_ORDER */
504:
505: iph->ip_id = ntohs(iph->ip_id);
506: }
507:
508: int
509: sockopt_tcp_signature (int sock, union sockunion *su, const char *password)
510: {
511: #if defined(HAVE_TCP_MD5_LINUX24) && defined(GNU_LINUX)
512: /* Support for the old Linux 2.4 TCP-MD5 patch, taken from Hasso Tepper's
513: * version of the Quagga patch (based on work by Rick Payne, and Bruce
514: * Simpson)
515: */
516: #define TCP_MD5_AUTH 13
517: #define TCP_MD5_AUTH_ADD 1
518: #define TCP_MD5_AUTH_DEL 2
519: struct tcp_rfc2385_cmd {
520: u_int8_t command; /* Command - Add/Delete */
521: u_int32_t address; /* IPV4 address associated */
522: u_int8_t keylen; /* MD5 Key len (do NOT assume 0 terminated ascii) */
523: void *key; /* MD5 Key */
524: } cmd;
525: struct in_addr *addr = &su->sin.sin_addr;
526:
527: cmd.command = (password != NULL ? TCP_MD5_AUTH_ADD : TCP_MD5_AUTH_DEL);
528: cmd.address = addr->s_addr;
529: cmd.keylen = (password != NULL ? strlen (password) : 0);
530: cmd.key = password;
531:
532: return setsockopt (sock, IPPROTO_TCP, TCP_MD5_AUTH, &cmd, sizeof cmd);
533:
534: #elif HAVE_DECL_TCP_MD5SIG
535: int ret;
536: #ifndef GNU_LINUX
537: /*
538: * XXX Need to do PF_KEY operation here to add/remove an SA entry,
539: * and add/remove an SP entry for this peer's packet flows also.
540: */
541: int md5sig = password && *password ? 1 : 0;
542: #else
543: int keylen = password ? strlen (password) : 0;
544: struct tcp_md5sig md5sig;
545: union sockunion *su2, *susock;
546:
547: /* Figure out whether the socket and the sockunion are the same family..
548: * adding AF_INET to AF_INET6 needs to be v4 mapped, you'd think..
549: */
550: if (!(susock = sockunion_getsockname (sock)))
551: return -1;
552:
553: if (susock->sa.sa_family == su->sa.sa_family)
554: su2 = su;
555: else
556: {
557: /* oops.. */
558: su2 = susock;
559:
560: if (su2->sa.sa_family == AF_INET)
561: {
562: sockunion_free (susock);
563: return 0;
564: }
565:
566: #ifdef HAVE_IPV6
567: /* If this does not work, then all users of this sockopt will need to
568: * differentiate between IPv4 and IPv6, and keep seperate sockets for
569: * each.
570: *
571: * Sadly, it doesn't seem to work at present. It's unknown whether
572: * this is a bug or not.
573: */
574: if (su2->sa.sa_family == AF_INET6
575: && su->sa.sa_family == AF_INET)
576: {
577: su2->sin6.sin6_family = AF_INET6;
578: /* V4Map the address */
579: memset (&su2->sin6.sin6_addr, 0, sizeof (struct in6_addr));
580: su2->sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
581: memcpy (&su2->sin6.sin6_addr.s6_addr32[3], &su->sin.sin_addr, 4);
582: }
583: #endif
584: }
585:
586: memset (&md5sig, 0, sizeof (md5sig));
587: memcpy (&md5sig.tcpm_addr, su2, sizeof (*su2));
588: md5sig.tcpm_keylen = keylen;
589: if (keylen)
590: memcpy (md5sig.tcpm_key, password, keylen);
591: sockunion_free (susock);
592: #endif /* GNU_LINUX */
593: if ((ret = setsockopt (sock, IPPROTO_TCP, TCP_MD5SIG, &md5sig, sizeof md5sig)) < 0)
594: {
595: /* ENOENT is harmless. It is returned when we clear a password for which
596: one was not previously set. */
597: if (ENOENT == errno)
598: ret = 0;
599: else
600: zlog_err ("sockopt_tcp_signature: setsockopt(%d): %s",
601: sock, safe_strerror(errno));
602: }
603: return ret;
604: #else /* HAVE_TCP_MD5SIG */
605: return -2;
606: #endif /* !HAVE_TCP_MD5SIG */
607: }
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