Index: head/usr.sbin/ndp/ndp.c =================================================================== --- head/usr.sbin/ndp/ndp.c (revision 340097) +++ head/usr.sbin/ndp/ndp.c (revision 340098) @@ -1,1386 +1,1386 @@ /* $FreeBSD$ */ /* $KAME: ndp.c,v 1.104 2003/06/27 07:48:39 itojun Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. * All rights reserved. * * 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. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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) 1984, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Sun Microsystems, Inc. * * 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. * 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. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. */ /* * Based on: * "@(#) Copyright (c) 1984, 1993\n\ * The Regents of the University of California. All rights reserved.\n"; * * "@(#)arp.c 8.2 (Berkeley) 1/2/94"; */ /* * ndp - display, set, delete and flush neighbor cache */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "gmt2local.h" #define NEXTADDR(w, s) \ if (rtm->rtm_addrs & (w)) { \ bcopy((char *)&s, cp, sizeof(s)); \ cp += SA_SIZE(&s); \ } static pid_t pid; static int nflag; static int tflag; static int32_t thiszone; /* time difference with gmt */ static int s = -1; static int repeat = 0; static char host_buf[NI_MAXHOST]; /* getnameinfo() */ static char ifix_buf[IFNAMSIZ]; /* if_indextoname() */ static int file(char *); static void getsocket(void); static int set(int, char **); static void get(char *); static int delete(char *); static void dump(struct sockaddr_in6 *, int); static struct in6_nbrinfo *getnbrinfo(struct in6_addr *, int, int); static char *ether_str(struct sockaddr_dl *); static int ndp_ether_aton(char *, u_char *); static void usage(void); static int rtmsg(int); static void ifinfo(char *, int, char **); static void rtrlist(void); static void plist(void); static void pfx_flush(void); static void rtr_flush(void); static void harmonize_rtr(void); #ifdef SIOCSDEFIFACE_IN6 /* XXX: check SIOCGDEFIFACE_IN6 as well? */ static void getdefif(void); static void setdefif(char *); #endif static char *sec2str(time_t); static void ts_print(const struct timeval *); static const char *rtpref_str[] = { "medium", /* 00 */ "high", /* 01 */ "rsv", /* 10 */ "low" /* 11 */ }; int main(int argc, char **argv) { int ch, mode = 0; char *arg = NULL; pid = getpid(); thiszone = gmt2local(0); while ((ch = getopt(argc, argv, "acd:f:Ii:nprstA:HPR")) != -1) switch (ch) { case 'a': case 'c': case 'p': case 'r': case 'H': case 'P': case 'R': case 's': case 'I': if (mode) { usage(); /*NOTREACHED*/ } mode = ch; arg = NULL; break; case 'f': exit(file(optarg) ? 1 : 0); case 'd': case 'i': if (mode) { usage(); /*NOTREACHED*/ } mode = ch; arg = optarg; break; case 'n': nflag = 1; break; case 't': tflag = 1; break; case 'A': if (mode) { usage(); /*NOTREACHED*/ } mode = 'a'; repeat = atoi(optarg); if (repeat < 0) { usage(); /*NOTREACHED*/ } break; default: usage(); } argc -= optind; argv += optind; switch (mode) { case 'a': case 'c': if (argc != 0) { usage(); /*NOTREACHED*/ } dump(0, mode == 'c'); break; case 'd': if (argc != 0) { usage(); /*NOTREACHED*/ } delete(arg); break; case 'I': #ifdef SIOCSDEFIFACE_IN6 /* XXX: check SIOCGDEFIFACE_IN6 as well? */ if (argc > 1) { usage(); /*NOTREACHED*/ } else if (argc == 1) { if (strcmp(*argv, "delete") == 0 || if_nametoindex(*argv)) setdefif(*argv); else errx(1, "invalid interface %s", *argv); } getdefif(); /* always call it to print the result */ break; #else errx(1, "not supported yet"); /*NOTREACHED*/ #endif case 'p': if (argc != 0) { usage(); /*NOTREACHED*/ } plist(); break; case 'i': ifinfo(arg, argc, argv); break; case 'r': if (argc != 0) { usage(); /*NOTREACHED*/ } rtrlist(); break; case 's': if (argc < 2 || argc > 4) usage(); exit(set(argc, argv) ? 1 : 0); case 'H': if (argc != 0) { usage(); /*NOTREACHED*/ } harmonize_rtr(); break; case 'P': if (argc != 0) { usage(); /*NOTREACHED*/ } pfx_flush(); break; case 'R': if (argc != 0) { usage(); /*NOTREACHED*/ } rtr_flush(); break; case 0: if (argc != 1) { usage(); /*NOTREACHED*/ } get(argv[0]); break; } exit(0); } /* * Process a file to set standard ndp entries */ static int file(char *name) { FILE *fp; int i, retval; char line[100], arg[5][50], *args[5], *p; if ((fp = fopen(name, "r")) == NULL) err(1, "cannot open %s", name); args[0] = &arg[0][0]; args[1] = &arg[1][0]; args[2] = &arg[2][0]; args[3] = &arg[3][0]; args[4] = &arg[4][0]; retval = 0; while (fgets(line, sizeof(line), fp) != NULL) { if ((p = strchr(line, '#')) != NULL) *p = '\0'; for (p = line; isblank(*p); p++); if (*p == '\n' || *p == '\0') continue; i = sscanf(line, "%49s %49s %49s %49s %49s", arg[0], arg[1], arg[2], arg[3], arg[4]); if (i < 2) { warnx("bad line: %s", line); retval = 1; continue; } if (set(i, args)) retval = 1; } fclose(fp); return (retval); } static void getsocket() { if (s < 0) { s = socket(PF_ROUTE, SOCK_RAW, 0); if (s < 0) { err(1, "socket"); /* NOTREACHED */ } } } static struct sockaddr_in6 so_mask = { .sin6_len = sizeof(so_mask), .sin6_family = AF_INET6 }; static struct sockaddr_in6 blank_sin = { .sin6_len = sizeof(blank_sin), .sin6_family = AF_INET6 }; static struct sockaddr_in6 sin_m; static struct sockaddr_dl blank_sdl = { .sdl_len = sizeof(blank_sdl), .sdl_family = AF_LINK }; static struct sockaddr_dl sdl_m; static time_t expire_time; static int flags, found_entry; static struct { struct rt_msghdr m_rtm; char m_space[512]; } m_rtmsg; /* * Set an individual neighbor cache entry */ static int set(int argc, char **argv) { register struct sockaddr_in6 *sin = &sin_m; register struct sockaddr_dl *sdl; register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); struct addrinfo hints, *res; int gai_error; u_char *ea; char *host = argv[0], *eaddr = argv[1]; getsocket(); argc -= 2; argv += 2; sdl_m = blank_sdl; sin_m = blank_sin; bzero(&hints, sizeof(hints)); hints.ai_family = AF_INET6; gai_error = getaddrinfo(host, NULL, &hints, &res); if (gai_error) { fprintf(stderr, "ndp: %s: %s\n", host, gai_strerror(gai_error)); return 1; } sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; sin->sin6_scope_id = ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id; ea = (u_char *)LLADDR(&sdl_m); if (ndp_ether_aton(eaddr, ea) == 0) sdl_m.sdl_alen = 6; flags = expire_time = 0; while (argc-- > 0) { if (strncmp(argv[0], "temp", 4) == 0) { struct timeval now; gettimeofday(&now, 0); expire_time = now.tv_sec + 20 * 60; } else if (strncmp(argv[0], "proxy", 5) == 0) flags |= RTF_ANNOUNCE; argv++; } if (rtmsg(RTM_GET) < 0) { errx(1, "RTM_GET(%s) failed", host); /* NOTREACHED */ } sin = (struct sockaddr_in6 *)(rtm + 1); sdl = (struct sockaddr_dl *)(ALIGN(sin->sin6_len) + (char *)sin); if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) { if (sdl->sdl_family == AF_LINK && !(rtm->rtm_flags & RTF_GATEWAY)) { switch (sdl->sdl_type) { case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: case IFT_ISO88024: case IFT_ISO88025: case IFT_L2VLAN: case IFT_BRIDGE: goto overwrite; } } fprintf(stderr, "set: cannot configure a new entry\n"); return 1; } overwrite: if (sdl->sdl_family != AF_LINK) { printf("cannot intuit interface index and type for %s\n", host); return (1); } sdl_m.sdl_type = sdl->sdl_type; sdl_m.sdl_index = sdl->sdl_index; return (rtmsg(RTM_ADD)); } /* * Display an individual neighbor cache entry */ static void get(char *host) { struct sockaddr_in6 *sin = &sin_m; struct addrinfo hints, *res; int gai_error; sin_m = blank_sin; bzero(&hints, sizeof(hints)); hints.ai_family = AF_INET6; gai_error = getaddrinfo(host, NULL, &hints, &res); if (gai_error) { fprintf(stderr, "ndp: %s: %s\n", host, gai_strerror(gai_error)); return; } sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; sin->sin6_scope_id = ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id; dump(sin, 0); if (found_entry == 0) { getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf, sizeof(host_buf), NULL ,0, (nflag ? NI_NUMERICHOST : 0)); printf("%s (%s) -- no entry\n", host, host_buf); exit(1); } } /* * Delete a neighbor cache entry */ static int delete(char *host) { struct sockaddr_in6 *sin = &sin_m; register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; register char *cp = m_rtmsg.m_space; struct sockaddr_dl *sdl; struct addrinfo hints, *res; int gai_error; getsocket(); sin_m = blank_sin; bzero(&hints, sizeof(hints)); hints.ai_family = AF_INET6; gai_error = getaddrinfo(host, NULL, &hints, &res); if (gai_error) { fprintf(stderr, "ndp: %s: %s\n", host, gai_strerror(gai_error)); return 1; } sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; sin->sin6_scope_id = ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id; if (rtmsg(RTM_GET) < 0) { errx(1, "RTM_GET(%s) failed", host); /* NOTREACHED */ } sin = (struct sockaddr_in6 *)(rtm + 1); sdl = (struct sockaddr_dl *)(ALIGN(sin->sin6_len) + (char *)sin); if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) { if (sdl->sdl_family == AF_LINK && !(rtm->rtm_flags & RTF_GATEWAY)) { goto delete; } fprintf(stderr, "delete: cannot delete non-NDP entry\n"); return 1; } delete: if (sdl->sdl_family != AF_LINK) { printf("cannot locate %s\n", host); return (1); } /* * need to reinit the field because it has rt_key * but we want the actual address */ NEXTADDR(RTA_DST, sin_m); rtm->rtm_flags |= RTF_LLDATA; if (rtmsg(RTM_DELETE) == 0) { getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf, sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0)); printf("%s (%s) deleted\n", host, host_buf); } return 0; } #define W_ADDR 36 #define W_LL 17 #define W_IF 6 /* * Dump the entire neighbor cache */ static void dump(struct sockaddr_in6 *addr, int cflag) { int mib[6]; size_t needed; char *lim, *buf, *next; struct rt_msghdr *rtm; struct sockaddr_in6 *sin; struct sockaddr_dl *sdl; struct timeval now; time_t expire; int addrwidth; int llwidth; int ifwidth; char flgbuf[8]; char *ifname; /* Print header */ if (!tflag && !cflag) printf("%-*.*s %-*.*s %*.*s %-9.9s %1s %5s\n", W_ADDR, W_ADDR, "Neighbor", W_LL, W_LL, "Linklayer Address", W_IF, W_IF, "Netif", "Expire", "S", "Flags"); again:; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = AF_INET6; mib[4] = NET_RT_FLAGS; #ifdef RTF_LLINFO mib[5] = RTF_LLINFO; #else mib[5] = 0; #endif if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) err(1, "sysctl(PF_ROUTE estimate)"); if (needed > 0) { if ((buf = malloc(needed)) == NULL) err(1, "malloc"); if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) err(1, "sysctl(PF_ROUTE, NET_RT_FLAGS)"); lim = buf + needed; } else buf = lim = NULL; for (next = buf; next && next < lim; next += rtm->rtm_msglen) { int isrouter = 0, prbs = 0; rtm = (struct rt_msghdr *)next; sin = (struct sockaddr_in6 *)(rtm + 1); sdl = (struct sockaddr_dl *)((char *)sin + ALIGN(sin->sin6_len)); /* * Some OSes can produce a route that has the LINK flag but * has a non-AF_LINK gateway (e.g. fe80::xx%lo0 on FreeBSD * and BSD/OS, where xx is not the interface identifier on * lo0). Such routes entry would annoy getnbrinfo() below, * so we skip them. * XXX: such routes should have the GATEWAY flag, not the * LINK flag. However, there is rotten routing software * that advertises all routes that have the GATEWAY flag. * Thus, KAME kernel intentionally does not set the LINK flag. * What is to be fixed is not ndp, but such routing software * (and the kernel workaround)... */ if (sdl->sdl_family != AF_LINK) continue; if (!(rtm->rtm_flags & RTF_HOST)) continue; if (addr) { if (IN6_ARE_ADDR_EQUAL(&addr->sin6_addr, &sin->sin6_addr) == 0 || addr->sin6_scope_id != sin->sin6_scope_id) continue; found_entry = 1; } else if (IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) continue; if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&sin->sin6_addr)) { /* XXX: should scope id be filled in the kernel? */ if (sin->sin6_scope_id == 0) sin->sin6_scope_id = sdl->sdl_index; } getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf, sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0)); if (cflag) { #ifdef RTF_WASCLONED if (rtm->rtm_flags & RTF_WASCLONED) delete(host_buf); #elif defined(RTF_CLONED) if (rtm->rtm_flags & RTF_CLONED) delete(host_buf); #else if (rtm->rtm_flags & RTF_PINNED) continue; delete(host_buf); #endif continue; } gettimeofday(&now, 0); if (tflag) ts_print(&now); addrwidth = strlen(host_buf); if (addrwidth < W_ADDR) addrwidth = W_ADDR; llwidth = strlen(ether_str(sdl)); if (W_ADDR + W_LL - addrwidth > llwidth) llwidth = W_ADDR + W_LL - addrwidth; ifname = if_indextoname(sdl->sdl_index, ifix_buf); if (ifname == NULL) { strlcpy(ifix_buf, "?", sizeof(ifix_buf)); ifname = ifix_buf; } ifwidth = strlen(ifname); if (W_ADDR + W_LL + W_IF - addrwidth - llwidth > ifwidth) ifwidth = W_ADDR + W_LL + W_IF - addrwidth - llwidth; printf("%-*.*s %-*.*s %*.*s", addrwidth, addrwidth, host_buf, llwidth, llwidth, ether_str(sdl), ifwidth, ifwidth, ifname); /* Print neighbor discovery specific information */ expire = rtm->rtm_rmx.rmx_expire; if (expire > now.tv_sec) printf(" %-9.9s", sec2str(expire - now.tv_sec)); else if (expire == 0) printf(" %-9.9s", "permanent"); else printf(" %-9.9s", "expired"); switch (rtm->rtm_rmx.rmx_state) { case ND6_LLINFO_NOSTATE: printf(" N"); break; #ifdef ND6_LLINFO_WAITDELETE case ND6_LLINFO_WAITDELETE: printf(" W"); break; #endif case ND6_LLINFO_INCOMPLETE: printf(" I"); break; case ND6_LLINFO_REACHABLE: printf(" R"); break; case ND6_LLINFO_STALE: printf(" S"); break; case ND6_LLINFO_DELAY: printf(" D"); break; case ND6_LLINFO_PROBE: printf(" P"); break; default: printf(" ?"); break; } isrouter = rtm->rtm_flags & RTF_GATEWAY; prbs = rtm->rtm_rmx.rmx_pksent; /* * other flags. R: router, P: proxy, W: ?? */ if ((rtm->rtm_addrs & RTA_NETMASK) == 0) { snprintf(flgbuf, sizeof(flgbuf), "%s%s", isrouter ? "R" : "", (rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : ""); } else { #if 0 /* W and P are mystery even for us */ sin = (struct sockaddr_in6 *) (sdl->sdl_len + (char *)sdl); snprintf(flgbuf, sizeof(flgbuf), "%s%s%s%s", isrouter ? "R" : "", !IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr) ? "P" : "", (sin->sin6_len != sizeof(struct sockaddr_in6)) ? "W" : "", (rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : ""); #else snprintf(flgbuf, sizeof(flgbuf), "%s%s", isrouter ? "R" : "", (rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : ""); #endif } printf(" %s", flgbuf); if (prbs) printf(" %d", prbs); printf("\n"); } if (buf != NULL) free(buf); if (repeat) { printf("\n"); fflush(stdout); sleep(repeat); goto again; } } static struct in6_nbrinfo * getnbrinfo(struct in6_addr *addr, int ifindex, int warning) { static struct in6_nbrinfo nbi; int sock; if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) err(1, "socket"); bzero(&nbi, sizeof(nbi)); if_indextoname(ifindex, nbi.ifname); nbi.addr = *addr; if (ioctl(sock, SIOCGNBRINFO_IN6, (caddr_t)&nbi) < 0) { if (warning) warn("ioctl(SIOCGNBRINFO_IN6)"); close(sock); return(NULL); } close(sock); return(&nbi); } static char * ether_str(struct sockaddr_dl *sdl) { static char hbuf[NI_MAXHOST]; if (sdl->sdl_alen == ETHER_ADDR_LEN) { strlcpy(hbuf, ether_ntoa((struct ether_addr *)LLADDR(sdl)), sizeof(hbuf)); } else if (sdl->sdl_alen) { int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; snprintf(hbuf, sizeof(hbuf), "%s", link_ntoa(sdl) + n); } else snprintf(hbuf, sizeof(hbuf), "(incomplete)"); return(hbuf); } static int ndp_ether_aton(char *a, u_char *n) { int i, o[6]; i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2], &o[3], &o[4], &o[5]); if (i != 6) { fprintf(stderr, "ndp: invalid Ethernet address '%s'\n", a); return (1); } for (i = 0; i < 6; i++) n[i] = o[i]; return (0); } static void usage() { printf("usage: ndp [-nt] hostname\n"); printf(" ndp [-nt] -a | -c | -p | -r | -H | -P | -R\n"); printf(" ndp [-nt] -A wait\n"); printf(" ndp [-nt] -d hostname\n"); printf(" ndp [-nt] -f filename\n"); printf(" ndp [-nt] -i interface [flags...]\n"); #ifdef SIOCSDEFIFACE_IN6 printf(" ndp [-nt] -I [interface|delete]\n"); #endif printf(" ndp [-nt] -s nodename etheraddr [temp] [proxy]\n"); exit(1); } static int rtmsg(int cmd) { static int seq; int rlen; register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; register char *cp = m_rtmsg.m_space; register int l; errno = 0; if (cmd == RTM_DELETE) goto doit; bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); rtm->rtm_flags = flags; rtm->rtm_version = RTM_VERSION; switch (cmd) { default: fprintf(stderr, "ndp: internal wrong cmd\n"); exit(1); case RTM_ADD: rtm->rtm_addrs |= RTA_GATEWAY; if (expire_time) { rtm->rtm_rmx.rmx_expire = expire_time; rtm->rtm_inits = RTV_EXPIRE; } rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA); #if 0 /* we don't support ipv6addr/128 type proxying */ if (rtm->rtm_flags & RTF_ANNOUNCE) { rtm->rtm_flags &= ~RTF_HOST; rtm->rtm_addrs |= RTA_NETMASK; } #endif /* FALLTHROUGH */ case RTM_GET: rtm->rtm_addrs |= RTA_DST; } NEXTADDR(RTA_DST, sin_m); NEXTADDR(RTA_GATEWAY, sdl_m); #if 0 /* we don't support ipv6addr/128 type proxying */ memset(&so_mask.sin6_addr, 0xff, sizeof(so_mask.sin6_addr)); NEXTADDR(RTA_NETMASK, so_mask); #endif rtm->rtm_msglen = cp - (char *)&m_rtmsg; doit: l = rtm->rtm_msglen; rtm->rtm_seq = ++seq; rtm->rtm_type = cmd; if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { if (errno != ESRCH || cmd != RTM_DELETE) { err(1, "writing to routing socket"); /* NOTREACHED */ } } do { l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); } while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != pid)); if (l < 0) (void) fprintf(stderr, "ndp: read from routing socket: %s\n", strerror(errno)); return (0); } static void ifinfo(char *ifname, int argc, char **argv) { struct in6_ndireq nd; int i, sock; u_int32_t newflags; #ifdef IPV6CTL_USETEMPADDR u_int8_t nullbuf[8]; #endif if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { err(1, "socket"); /* NOTREACHED */ } bzero(&nd, sizeof(nd)); strlcpy(nd.ifname, ifname, sizeof(nd.ifname)); if (ioctl(sock, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { err(1, "ioctl(SIOCGIFINFO_IN6)"); /* NOTREACHED */ } #define ND nd.ndi newflags = ND.flags; for (i = 0; i < argc; i++) { int clear = 0; char *cp = argv[i]; if (*cp == '-') { clear = 1; cp++; } #define SETFLAG(s, f) do { \ if (strcmp(cp, (s)) == 0) { \ if (clear) \ newflags &= ~(f); \ else \ newflags |= (f); \ } \ } while (0) /* * XXX: this macro is not 100% correct, in that it matches "nud" against * "nudbogus". But we just let it go since this is minor. */ #define SETVALUE(f, v) do { \ char *valptr; \ unsigned long newval; \ v = 0; /* unspecified */ \ if (strncmp(cp, f, strlen(f)) == 0) { \ valptr = strchr(cp, '='); \ if (valptr == NULL) \ err(1, "syntax error in %s field", (f)); \ errno = 0; \ newval = strtoul(++valptr, NULL, 0); \ if (errno) \ err(1, "syntax error in %s's value", (f)); \ v = newval; \ } \ } while (0) SETFLAG("disabled", ND6_IFF_IFDISABLED); SETFLAG("nud", ND6_IFF_PERFORMNUD); #ifdef ND6_IFF_ACCEPT_RTADV SETFLAG("accept_rtadv", ND6_IFF_ACCEPT_RTADV); #endif #ifdef ND6_IFF_AUTO_LINKLOCAL SETFLAG("auto_linklocal", ND6_IFF_AUTO_LINKLOCAL); #endif #ifdef ND6_IFF_NO_PREFER_IFACE SETFLAG("no_prefer_iface", ND6_IFF_NO_PREFER_IFACE); #endif SETVALUE("basereachable", ND.basereachable); SETVALUE("retrans", ND.retrans); SETVALUE("curhlim", ND.chlim); ND.flags = newflags; if (ioctl(sock, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) { err(1, "ioctl(SIOCSIFINFO_IN6)"); /* NOTREACHED */ } #undef SETFLAG #undef SETVALUE } if (!ND.initialized) { errx(1, "%s: not initialized yet", ifname); /* NOTREACHED */ } if (ioctl(sock, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { err(1, "ioctl(SIOCGIFINFO_IN6)"); /* NOTREACHED */ } printf("linkmtu=%d", ND.linkmtu); printf(", maxmtu=%d", ND.maxmtu); printf(", curhlim=%d", ND.chlim); printf(", basereachable=%ds%dms", ND.basereachable / 1000, ND.basereachable % 1000); printf(", reachable=%ds", ND.reachable); printf(", retrans=%ds%dms", ND.retrans / 1000, ND.retrans % 1000); #ifdef IPV6CTL_USETEMPADDR memset(nullbuf, 0, sizeof(nullbuf)); if (memcmp(nullbuf, ND.randomid, sizeof(nullbuf)) != 0) { int j; u_int8_t *rbuf; for (i = 0; i < 3; i++) { switch (i) { case 0: printf("\nRandom seed(0): "); rbuf = ND.randomseed0; break; case 1: printf("\nRandom seed(1): "); rbuf = ND.randomseed1; break; case 2: printf("\nRandom ID: "); rbuf = ND.randomid; break; default: errx(1, "impossible case for tempaddr display"); } for (j = 0; j < 8; j++) printf("%02x", rbuf[j]); } } #endif /* IPV6CTL_USETEMPADDR */ if (ND.flags) { printf("\nFlags: "); #ifdef ND6_IFF_IFDISABLED if ((ND.flags & ND6_IFF_IFDISABLED)) printf("disabled "); #endif if ((ND.flags & ND6_IFF_PERFORMNUD)) printf("nud "); #ifdef ND6_IFF_ACCEPT_RTADV if ((ND.flags & ND6_IFF_ACCEPT_RTADV)) printf("accept_rtadv "); #endif #ifdef ND6_IFF_AUTO_LINKLOCAL if ((ND.flags & ND6_IFF_AUTO_LINKLOCAL)) printf("auto_linklocal "); #endif #ifdef ND6_IFF_NO_PREFER_IFACE if ((ND.flags & ND6_IFF_NO_PREFER_IFACE)) printf("no_prefer_iface "); #endif } putc('\n', stdout); #undef ND close(sock); } #ifndef ND_RA_FLAG_RTPREF_MASK /* XXX: just for compilation on *BSD release */ #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */ #endif static void rtrlist() { int mib[] = { CTL_NET, PF_INET6, IPPROTO_ICMPV6, ICMPV6CTL_ND6_DRLIST }; char *buf; struct in6_defrouter *p, *ep; size_t l; struct timeval now; if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) { err(1, "sysctl(ICMPV6CTL_ND6_DRLIST)"); /*NOTREACHED*/ } if (l == 0) return; buf = malloc(l); if (!buf) { err(1, "malloc"); /*NOTREACHED*/ } if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) { err(1, "sysctl(ICMPV6CTL_ND6_DRLIST)"); /*NOTREACHED*/ } ep = (struct in6_defrouter *)(buf + l); for (p = (struct in6_defrouter *)buf; p < ep; p++) { int rtpref; if (getnameinfo((struct sockaddr *)&p->rtaddr, p->rtaddr.sin6_len, host_buf, sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0)) != 0) strlcpy(host_buf, "?", sizeof(host_buf)); printf("%s if=%s", host_buf, if_indextoname(p->if_index, ifix_buf)); printf(", flags=%s%s", p->flags & ND_RA_FLAG_MANAGED ? "M" : "", p->flags & ND_RA_FLAG_OTHER ? "O" : ""); #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG - printf("%s", p->flags & ND_RA_FLAG_IPV6_ONLY ? "6" : ""); + printf("%s", p->flags & ND_RA_FLAG_IPV6_ONLY ? "S" : ""); #endif rtpref = ((p->flags & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff; printf(", pref=%s", rtpref_str[rtpref]); gettimeofday(&now, 0); if (p->expire == 0) printf(", expire=Never\n"); else printf(", expire=%s\n", sec2str(p->expire - now.tv_sec)); } free(buf); } static void plist() { int mib[] = { CTL_NET, PF_INET6, IPPROTO_ICMPV6, ICMPV6CTL_ND6_PRLIST }; char *buf; struct in6_prefix *p, *ep, *n; struct sockaddr_in6 *advrtr; size_t l; struct timeval now; const int niflags = NI_NUMERICHOST; int ninflags = nflag ? NI_NUMERICHOST : 0; char namebuf[NI_MAXHOST]; if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) { err(1, "sysctl(ICMPV6CTL_ND6_PRLIST)"); /*NOTREACHED*/ } buf = malloc(l); if (!buf) { err(1, "malloc"); /*NOTREACHED*/ } if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) { err(1, "sysctl(ICMPV6CTL_ND6_PRLIST)"); /*NOTREACHED*/ } ep = (struct in6_prefix *)(buf + l); for (p = (struct in6_prefix *)buf; p < ep; p = n) { advrtr = (struct sockaddr_in6 *)(p + 1); n = (struct in6_prefix *)&advrtr[p->advrtrs]; if (getnameinfo((struct sockaddr *)&p->prefix, p->prefix.sin6_len, namebuf, sizeof(namebuf), NULL, 0, niflags) != 0) strlcpy(namebuf, "?", sizeof(namebuf)); printf("%s/%d if=%s\n", namebuf, p->prefixlen, if_indextoname(p->if_index, ifix_buf)); gettimeofday(&now, 0); /* * meaning of fields, especially flags, is very different * by origin. notify the difference to the users. */ printf("flags=%s%s%s%s%s", p->raflags.onlink ? "L" : "", p->raflags.autonomous ? "A" : "", (p->flags & NDPRF_ONLINK) != 0 ? "O" : "", (p->flags & NDPRF_DETACHED) != 0 ? "D" : "", #ifdef NDPRF_HOME (p->flags & NDPRF_HOME) != 0 ? "H" : "" #else "" #endif ); if (p->vltime == ND6_INFINITE_LIFETIME) printf(" vltime=infinity"); else printf(" vltime=%lu", (unsigned long)p->vltime); if (p->pltime == ND6_INFINITE_LIFETIME) printf(", pltime=infinity"); else printf(", pltime=%lu", (unsigned long)p->pltime); if (p->expire == 0) printf(", expire=Never"); else if (p->expire >= now.tv_sec) printf(", expire=%s", sec2str(p->expire - now.tv_sec)); else printf(", expired"); printf(", ref=%d", p->refcnt); printf("\n"); /* * "advertising router" list is meaningful only if the prefix * information is from RA. */ if (p->advrtrs) { int j; struct sockaddr_in6 *sin6; sin6 = advrtr; printf(" advertised by\n"); for (j = 0; j < p->advrtrs; j++) { struct in6_nbrinfo *nbi; if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len, namebuf, sizeof(namebuf), NULL, 0, ninflags) != 0) strlcpy(namebuf, "?", sizeof(namebuf)); printf(" %s", namebuf); nbi = getnbrinfo(&sin6->sin6_addr, p->if_index, 0); if (nbi) { switch (nbi->state) { case ND6_LLINFO_REACHABLE: case ND6_LLINFO_STALE: case ND6_LLINFO_DELAY: case ND6_LLINFO_PROBE: printf(" (reachable)\n"); break; default: printf(" (unreachable)\n"); } } else printf(" (no neighbor state)\n"); sin6++; } } else printf(" No advertising router\n"); } free(buf); } static void pfx_flush() { char dummyif[IFNAMSIZ+8]; int sock; if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) err(1, "socket"); strlcpy(dummyif, "lo0", sizeof(dummyif)); /* dummy */ if (ioctl(sock, SIOCSPFXFLUSH_IN6, (caddr_t)&dummyif) < 0) err(1, "ioctl(SIOCSPFXFLUSH_IN6)"); close(sock); } static void rtr_flush() { char dummyif[IFNAMSIZ+8]; int sock; if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) err(1, "socket"); strlcpy(dummyif, "lo0", sizeof(dummyif)); /* dummy */ if (ioctl(sock, SIOCSRTRFLUSH_IN6, (caddr_t)&dummyif) < 0) err(1, "ioctl(SIOCSRTRFLUSH_IN6)"); close(sock); } static void harmonize_rtr() { char dummyif[IFNAMSIZ+8]; int sock; if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) err(1, "socket"); strlcpy(dummyif, "lo0", sizeof(dummyif)); /* dummy */ if (ioctl(sock, SIOCSNDFLUSH_IN6, (caddr_t)&dummyif) < 0) err(1, "ioctl(SIOCSNDFLUSH_IN6)"); close(sock); } #ifdef SIOCSDEFIFACE_IN6 /* XXX: check SIOCGDEFIFACE_IN6 as well? */ static void setdefif(char *ifname) { struct in6_ndifreq ndifreq; unsigned int ifindex; int sock; if (strcasecmp(ifname, "delete") == 0) ifindex = 0; else { if ((ifindex = if_nametoindex(ifname)) == 0) err(1, "failed to resolve i/f index for %s", ifname); } if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) err(1, "socket"); strlcpy(ndifreq.ifname, "lo0", sizeof(ndifreq.ifname)); /* dummy */ ndifreq.ifindex = ifindex; if (ioctl(sock, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq) < 0) err(1, "ioctl(SIOCSDEFIFACE_IN6)"); close(sock); } static void getdefif() { struct in6_ndifreq ndifreq; char ifname[IFNAMSIZ+8]; int sock; if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) err(1, "socket"); memset(&ndifreq, 0, sizeof(ndifreq)); strlcpy(ndifreq.ifname, "lo0", sizeof(ndifreq.ifname)); /* dummy */ if (ioctl(sock, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq) < 0) err(1, "ioctl(SIOCGDEFIFACE_IN6)"); if (ndifreq.ifindex == 0) printf("No default interface.\n"); else { if ((if_indextoname(ndifreq.ifindex, ifname)) == NULL) err(1, "failed to resolve ifname for index %lu", ndifreq.ifindex); printf("ND default interface = %s\n", ifname); } close(sock); } #endif /* SIOCSDEFIFACE_IN6 */ static char * sec2str(time_t total) { static char result[256]; int days, hours, mins, secs; int first = 1; char *p = result; char *ep = &result[sizeof(result)]; int n; days = total / 3600 / 24; hours = (total / 3600) % 24; mins = (total / 60) % 60; secs = total % 60; if (days) { first = 0; n = snprintf(p, ep - p, "%dd", days); if (n < 0 || n >= ep - p) return "?"; p += n; } if (!first || hours) { first = 0; n = snprintf(p, ep - p, "%dh", hours); if (n < 0 || n >= ep - p) return "?"; p += n; } if (!first || mins) { first = 0; n = snprintf(p, ep - p, "%dm", mins); if (n < 0 || n >= ep - p) return "?"; p += n; } snprintf(p, ep - p, "%ds", secs); return(result); } /* * Print the timestamp * from tcpdump/util.c */ static void ts_print(const struct timeval *tvp) { int sec; /* Default */ sec = (tvp->tv_sec + thiszone) % 86400; (void)printf("%02d:%02d:%02d.%06u ", sec / 3600, (sec % 3600) / 60, sec % 60, (u_int32_t)tvp->tv_usec); } #undef NEXTADDR Index: head/usr.sbin/rtadvd/config.c =================================================================== --- head/usr.sbin/rtadvd/config.c (revision 340097) +++ head/usr.sbin/rtadvd/config.c (revision 340098) @@ -1,1553 +1,1553 @@ /* $FreeBSD$ */ /* $KAME: config.c,v 1.84 2003/08/05 12:34:23 itojun Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (C) 1998 WIDE Project. * Copyright (C) 2011 Hiroki Sato * All rights reserved. * * 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. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "rtadvd.h" #include "advcap.h" #include "timer.h" #include "if.h" #include "config.h" /* label of tcapcode + number + domain name + zero octet */ static char entbuf[10 + 3 + NI_MAXHOST + 1]; static char oentbuf[10 + 3 + NI_MAXHOST + 1]; static char abuf[DNAME_LABELENC_MAXLEN]; static time_t prefix_timo = (60 * 120); /* 2 hours. * XXX: should be configurable. */ static struct rtadvd_timer *prefix_timeout(void *); static void makeentry(char *, size_t, int, const char *); static ssize_t dname_labelenc(char *, const char *); /* Encode domain name label encoding in RFC 1035 Section 3.1 */ static ssize_t dname_labelenc(char *dst, const char *src) { char *dst_origin; char *p; size_t len; dst_origin = dst; len = strlen(src); if (len + len / 64 + 1 + 1 > DNAME_LABELENC_MAXLEN) return (-1); /* Length fields per 63 octets + '\0' (<= DNAME_LABELENC_MAXLEN) */ memset(dst, 0, len + len / 64 + 1 + 1); syslog(LOG_DEBUG, "<%s> labelenc = %s", __func__, src); while (src && (len = strlen(src)) != 0) { /* Put a length field with 63 octet limitation first. */ p = strchr(src, '.'); if (p == NULL) *dst = len = MIN(63, len); else *dst = len = MIN(63, p - src); if (dst + 1 + len < dst_origin + DNAME_LABELENC_MAXLEN) dst++; else return (-1); /* Copy 63 octets at most. */ memcpy(dst, src, len); dst += len; if (p == NULL) /* the last label */ break; src = p + 1; } /* Always need a 0-length label at the tail. */ *dst++ = '\0'; syslog(LOG_DEBUG, "<%s> labellen = %td", __func__, dst - dst_origin); return (dst - dst_origin); } #define MUSTHAVE(var, cap) \ do { \ int64_t t; \ if ((t = agetnum(cap)) < 0) { \ fprintf(stderr, "rtadvd: need %s for interface %s\n", \ cap, intface); \ exit(1); \ } \ var = t; \ } while (0) #define MAYHAVE(var, cap, def) \ do { \ if ((var = agetnum(cap)) < 0) \ var = def; \ } while (0) int loadconfig_index(int idx) { char ifname[IFNAMSIZ]; syslog(LOG_DEBUG, "<%s> enter", __func__); if (if_indextoname(idx, ifname) != NULL) return (loadconfig_ifname(ifname)); else return (1); } int loadconfig_ifname(char *ifname) { struct ifinfo *ifi; syslog(LOG_DEBUG, "<%s> enter", __func__); update_ifinfo(&ifilist, UPDATE_IFINFO_ALL); TAILQ_FOREACH(ifi, &ifilist, ifi_next) { /* NULL means all IFs will be processed. */ if (ifname != NULL && strcmp(ifi->ifi_ifname, ifname) != 0) continue; if (!ifi->ifi_persist) { syslog(LOG_INFO, "<%s> %s is not a target interface. " "Ignored at this moment.", __func__, ifi->ifi_ifname); continue; } if (ifi->ifi_ifindex == 0) { syslog(LOG_ERR, "<%s> %s not found. " "Ignored at this moment.", __func__, ifi->ifi_ifname); continue; } if (getconfig(ifi) == NULL) { syslog(LOG_ERR, "<%s> invalid configuration for %s. " "Ignored at this moment.", __func__, ifi->ifi_ifname); continue; } } return (0); } int rm_ifinfo_index(int idx) { struct ifinfo *ifi; ifi = if_indextoifinfo(idx); if (ifi == NULL) { syslog(LOG_ERR, "<%s>: ifinfo not found (idx=%d)", __func__, idx); return (-1); } return (rm_ifinfo(ifi)); } int rm_ifinfo(struct ifinfo *ifi) { int error; syslog(LOG_DEBUG, "<%s> enter (%s).", __func__, ifi->ifi_ifname); switch (ifi->ifi_state) { case IFI_STATE_UNCONFIGURED: return (0); break; default: ifi->ifi_state = IFI_STATE_UNCONFIGURED; syslog(LOG_DEBUG, "<%s> ifname=%s marked as UNCONFIGURED.", __func__, ifi->ifi_ifname); /* XXX: No MC leaving here because index is disappeared */ /* Inactivate timer */ rtadvd_remove_timer(ifi->ifi_ra_timer); ifi->ifi_ra_timer = NULL; break; } /* clean up ifi */ if (!ifi->ifi_persist) { TAILQ_REMOVE(&ifilist, ifi, ifi_next); syslog(LOG_DEBUG, "<%s>: ifinfo (idx=%d) removed.", __func__, ifi->ifi_ifindex); } else { /* recreate an empty entry */ update_persist_ifinfo(&ifilist, ifi->ifi_ifname); syslog(LOG_DEBUG, "<%s>: ifname=%s is persistent.", __func__, ifi->ifi_ifname); } /* clean up rai if any */ switch (ifi->ifi_state) { case IFI_STATE_CONFIGURED: if (ifi->ifi_rainfo != NULL) { error = rm_rainfo(ifi->ifi_rainfo); if (error) return (error); ifi->ifi_rainfo = NULL; } break; case IFI_STATE_TRANSITIVE: if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { if (ifi->ifi_rainfo != NULL) { error = rm_rainfo(ifi->ifi_rainfo); if (error) return (error); ifi->ifi_rainfo = NULL; ifi->ifi_rainfo_trans = NULL; } } else { if (ifi->ifi_rainfo != NULL) { error = rm_rainfo(ifi->ifi_rainfo); if (error) return (error); ifi->ifi_rainfo = NULL; } if (ifi->ifi_rainfo_trans != NULL) { error = rm_rainfo(ifi->ifi_rainfo_trans); if (error) return (error); ifi->ifi_rainfo_trans = NULL; } } } syslog(LOG_DEBUG, "<%s> leave (%s).", __func__, ifi->ifi_ifname); if (!ifi->ifi_persist) free(ifi); return (0); } int rm_rainfo(struct rainfo *rai) { struct prefix *pfx; struct soliciter *sol; struct rdnss *rdn; struct rdnss_addr *rdna; struct dnssl *dns; struct rtinfo *rti; syslog(LOG_DEBUG, "<%s>: enter", __func__); TAILQ_REMOVE(&railist, rai, rai_next); if (rai->rai_ifinfo != NULL) syslog(LOG_DEBUG, "<%s>: rainfo (idx=%d) removed.", __func__, rai->rai_ifinfo->ifi_ifindex); if (rai->rai_ra_data != NULL) free(rai->rai_ra_data); while ((pfx = TAILQ_FIRST(&rai->rai_prefix)) != NULL) delete_prefix(pfx); while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) { TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next); free(sol); } while ((rdn = TAILQ_FIRST(&rai->rai_rdnss)) != NULL) { TAILQ_REMOVE(&rai->rai_rdnss, rdn, rd_next); while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) { TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next); free(rdna); } free(rdn); } while ((dns = TAILQ_FIRST(&rai->rai_dnssl)) != NULL) { TAILQ_REMOVE(&rai->rai_dnssl, dns, dn_next); free(dns); } while ((rti = TAILQ_FIRST(&rai->rai_route)) != NULL) { TAILQ_REMOVE(&rai->rai_route, rti, rti_next); free(rti); } free(rai); syslog(LOG_DEBUG, "<%s>: leave", __func__); return (0); } struct ifinfo * getconfig(struct ifinfo *ifi) { int stat, i; int error; char tbuf[BUFSIZ]; struct rainfo *rai; struct rainfo *rai_old; int32_t val; int64_t val64; char buf[BUFSIZ]; char *bp = buf; char *addr, *flagstr; if (ifi == NULL) /* if does not exist */ return (NULL); if (ifi->ifi_state == IFI_STATE_TRANSITIVE && ifi->ifi_rainfo == NULL) { syslog(LOG_INFO, "<%s> %s is shutting down. Skipped.", __func__, ifi->ifi_ifname); return (NULL); } if ((stat = agetent(tbuf, ifi->ifi_ifname)) <= 0) { memset(tbuf, 0, sizeof(tbuf)); syslog(LOG_INFO, "<%s> %s isn't defined in the configuration file" " or the configuration file doesn't exist." " Treat it as default", __func__, ifi->ifi_ifname); } ELM_MALLOC(rai, exit(1)); TAILQ_INIT(&rai->rai_prefix); TAILQ_INIT(&rai->rai_route); TAILQ_INIT(&rai->rai_rdnss); TAILQ_INIT(&rai->rai_dnssl); TAILQ_INIT(&rai->rai_soliciter); rai->rai_ifinfo = ifi; /* gather on-link prefixes from the network interfaces. */ if (agetflag("noifprefix")) rai->rai_advifprefix = 0; else rai->rai_advifprefix = 1; /* get interface information */ if (agetflag("nolladdr")) rai->rai_advlinkopt = 0; else rai->rai_advlinkopt = 1; if (rai->rai_advlinkopt) { if (ifi->ifi_sdl.sdl_type == 0) { syslog(LOG_ERR, "<%s> can't get information of %s", __func__, ifi->ifi_ifname); goto getconfig_free_rai; } } /* * set router configuration variables. */ MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL); if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) { syslog(LOG_ERR, "<%s> maxinterval (%" PRIu32 ") on %s is invalid " "(must be between %u and %u)", __func__, val, ifi->ifi_ifname, MIN_MAXINTERVAL, MAX_MAXINTERVAL); goto getconfig_free_rai; } rai->rai_maxinterval = (uint16_t)val; MAYHAVE(val, "mininterval", rai->rai_maxinterval/3); if ((uint16_t)val < MIN_MININTERVAL || (uint16_t)val > (rai->rai_maxinterval * 3) / 4) { syslog(LOG_ERR, "<%s> mininterval (%" PRIu32 ") on %s is invalid " "(must be between %d and %d)", __func__, val, ifi->ifi_ifname, MIN_MININTERVAL, (rai->rai_maxinterval * 3) / 4); goto getconfig_free_rai; } rai->rai_mininterval = (uint16_t)val; MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT); rai->rai_hoplimit = val & 0xff; if ((flagstr = (char *)agetstr("raflags", &bp))) { val = 0; if (strchr(flagstr, 'm')) val |= ND_RA_FLAG_MANAGED; if (strchr(flagstr, 'o')) val |= ND_RA_FLAG_OTHER; if (strchr(flagstr, 'h')) val |= ND_RA_FLAG_RTPREF_HIGH; if (strchr(flagstr, 'l')) { if ((val & ND_RA_FLAG_RTPREF_HIGH)) { syslog(LOG_ERR, "<%s> the \'h\' and \'l\'" " router flags are exclusive", __func__); goto getconfig_free_rai; } val |= ND_RA_FLAG_RTPREF_LOW; } #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG - if (strchr(flagstr, '6')) + if (strchr(flagstr, 'S')) val |= ND_RA_FLAG_IPV6_ONLY; #endif } else MAYHAVE(val, "raflags", 0); rai->rai_managedflg = val & ND_RA_FLAG_MANAGED; rai->rai_otherflg = val & ND_RA_FLAG_OTHER; #ifndef ND_RA_FLAG_RTPREF_MASK #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */ #define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */ #endif rai->rai_rtpref = val & ND_RA_FLAG_RTPREF_MASK; if (rai->rai_rtpref == ND_RA_FLAG_RTPREF_RSV) { syslog(LOG_ERR, "<%s> invalid router preference (%02x) on %s", __func__, rai->rai_rtpref, ifi->ifi_ifname); goto getconfig_free_rai; } #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG rai->rai_ipv6onlyflg = val & ND_RA_FLAG_IPV6_ONLY; #endif MAYHAVE(val, "rltime", rai->rai_maxinterval * 3); if ((uint16_t)val && ((uint16_t)val < rai->rai_maxinterval || (uint16_t)val > MAXROUTERLIFETIME)) { syslog(LOG_ERR, "<%s> router lifetime (%" PRIu32 ") on %s is invalid " "(must be 0 or between %d and %d)", __func__, val, ifi->ifi_ifname, rai->rai_maxinterval, MAXROUTERLIFETIME); goto getconfig_free_rai; } rai->rai_lifetime = val & 0xffff; MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME); if (val < 0 || val > MAXREACHABLETIME) { syslog(LOG_ERR, "<%s> reachable time (%" PRIu32 ") on %s is invalid " "(must be no greater than %d)", __func__, val, ifi->ifi_ifname, MAXREACHABLETIME); goto getconfig_free_rai; } rai->rai_reachabletime = (uint32_t)val; MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER); if (val64 < 0 || val64 > 0xffffffff) { syslog(LOG_ERR, "<%s> retrans time (%" PRIu64 ") on %s out of range", __func__, val64, ifi->ifi_ifname); goto getconfig_free_rai; } rai->rai_retranstimer = (uint32_t)val64; if (agetnum("hapref") != -1 || agetnum("hatime") != -1) { syslog(LOG_ERR, "<%s> mobile-ip6 configuration not supported", __func__); goto getconfig_free_rai; } /* prefix information */ /* * This is an implementation specific parameter to consider * link propagation delays and poorly synchronized clocks when * checking consistency of advertised lifetimes. */ MAYHAVE(val, "clockskew", 0); rai->rai_clockskew = val; rai->rai_pfxs = 0; for (i = -1; i < MAXPREFIX; i++) { struct prefix *pfx; makeentry(entbuf, sizeof(entbuf), i, "addr"); addr = (char *)agetstr(entbuf, &bp); if (addr == NULL) continue; /* allocate memory to store prefix information */ ELM_MALLOC(pfx, exit(1)); pfx->pfx_rainfo = rai; pfx->pfx_origin = PREFIX_FROM_CONFIG; if (inet_pton(AF_INET6, addr, &pfx->pfx_prefix) != 1) { syslog(LOG_ERR, "<%s> inet_pton failed for %s", __func__, addr); goto getconfig_free_pfx; } if (IN6_IS_ADDR_MULTICAST(&pfx->pfx_prefix)) { syslog(LOG_ERR, "<%s> multicast prefix (%s) must " "not be advertised on %s", __func__, addr, ifi->ifi_ifname); goto getconfig_free_pfx; } if (IN6_IS_ADDR_LINKLOCAL(&pfx->pfx_prefix)) syslog(LOG_NOTICE, "<%s> link-local prefix (%s) will be" " advertised on %s", __func__, addr, ifi->ifi_ifname); makeentry(entbuf, sizeof(entbuf), i, "prefixlen"); MAYHAVE(val, entbuf, 64); if (val < 0 || val > 128) { syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s " "on %s out of range", __func__, val, addr, ifi->ifi_ifname); goto getconfig_free_pfx; } pfx->pfx_prefixlen = (int)val; makeentry(entbuf, sizeof(entbuf), i, "pinfoflags"); if ((flagstr = (char *)agetstr(entbuf, &bp))) { val = 0; if (strchr(flagstr, 'l')) val |= ND_OPT_PI_FLAG_ONLINK; if (strchr(flagstr, 'a')) val |= ND_OPT_PI_FLAG_AUTO; } else { MAYHAVE(val, entbuf, (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO)); } pfx->pfx_onlinkflg = val & ND_OPT_PI_FLAG_ONLINK; pfx->pfx_autoconfflg = val & ND_OPT_PI_FLAG_AUTO; makeentry(entbuf, sizeof(entbuf), i, "vltime"); MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); if (val64 < 0 || val64 > 0xffffffff) { syslog(LOG_ERR, "<%s> vltime (%" PRIu64 ") for " "%s/%d on %s is out of range", __func__, val64, addr, pfx->pfx_prefixlen, ifi->ifi_ifname); goto getconfig_free_pfx; } pfx->pfx_validlifetime = (uint32_t)val64; makeentry(entbuf, sizeof(entbuf), i, "vltimedecr"); if (agetflag(entbuf)) { struct timespec now; clock_gettime(CLOCK_MONOTONIC_FAST, &now); pfx->pfx_vltimeexpire = now.tv_sec + pfx->pfx_validlifetime; } makeentry(entbuf, sizeof(entbuf), i, "pltime"); MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME); if (val64 < 0 || val64 > 0xffffffff) { syslog(LOG_ERR, "<%s> pltime (%" PRIu64 ") for %s/%d on %s " "is out of range", __func__, val64, addr, pfx->pfx_prefixlen, ifi->ifi_ifname); goto getconfig_free_pfx; } pfx->pfx_preflifetime = (uint32_t)val64; makeentry(entbuf, sizeof(entbuf), i, "pltimedecr"); if (agetflag(entbuf)) { struct timespec now; clock_gettime(CLOCK_MONOTONIC_FAST, &now); pfx->pfx_pltimeexpire = now.tv_sec + pfx->pfx_preflifetime; } /* link into chain */ TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); rai->rai_pfxs++; continue; getconfig_free_pfx: free(pfx); } if (rai->rai_advifprefix && rai->rai_pfxs == 0) get_prefix(rai); MAYHAVE(val64, "mtu", 0); if (val < 0 || val64 > 0xffffffff) { syslog(LOG_ERR, "<%s> mtu (%" PRIu64 ") on %s out of range", __func__, val64, ifi->ifi_ifname); goto getconfig_free_rai; } rai->rai_linkmtu = (uint32_t)val64; if (rai->rai_linkmtu == 0) { char *mtustr; if ((mtustr = (char *)agetstr("mtu", &bp)) && strcmp(mtustr, "auto") == 0) rai->rai_linkmtu = ifi->ifi_phymtu; } else if (rai->rai_linkmtu < IPV6_MMTU || rai->rai_linkmtu > ifi->ifi_phymtu) { syslog(LOG_ERR, "<%s> advertised link mtu (%" PRIu32 ") on %s is invalid (must " "be between least MTU (%d) and physical link MTU (%d)", __func__, rai->rai_linkmtu, ifi->ifi_ifname, IPV6_MMTU, ifi->ifi_phymtu); goto getconfig_free_rai; } #ifdef SIOCSIFINFO_IN6 { struct in6_ndireq ndi; int s; if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno)); exit(1); } memset(&ndi, 0, sizeof(ndi)); strlcpy(ndi.ifname, ifi->ifi_ifname, sizeof(ndi.ifname)); if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0) syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s", __func__, ifi->ifi_ifname, strerror(errno)); /* reflect the RA info to the host variables in kernel */ ndi.ndi.chlim = rai->rai_hoplimit; ndi.ndi.retrans = rai->rai_retranstimer; ndi.ndi.basereachable = rai->rai_reachabletime; if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0) syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s", __func__, ifi->ifi_ifname, strerror(errno)); close(s); } #endif /* route information */ rai->rai_routes = 0; for (i = -1; i < MAXROUTE; i++) { struct rtinfo *rti; makeentry(entbuf, sizeof(entbuf), i, "rtprefix"); addr = (char *)agetstr(entbuf, &bp); if (addr == NULL) { makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix"); addr = (char *)agetstr(oentbuf, &bp); if (addr) fprintf(stderr, "%s was obsoleted. Use %s.\n", oentbuf, entbuf); } if (addr == NULL) continue; /* allocate memory to store prefix information */ ELM_MALLOC(rti, exit(1)); if (inet_pton(AF_INET6, addr, &rti->rti_prefix) != 1) { syslog(LOG_ERR, "<%s> inet_pton failed for %s", __func__, addr); goto getconfig_free_rti; } #if 0 /* * XXX: currently there's no restriction in route information * prefix according to * draft-ietf-ipngwg-router-selection-00.txt. * However, I think the similar restriction be necessary. */ MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) { syslog(LOG_ERR, "<%s> multicast route (%s) must " "not be advertised on %s", __func__, addr, ifi->ifi_ifname); goto getconfig_free_rti; } if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) { syslog(LOG_NOTICE, "<%s> link-local route (%s) will " "be advertised on %s", __func__, addr, ifi->ifi_ifname); goto getconfig_free_rti; } #endif makeentry(entbuf, sizeof(entbuf), i, "rtplen"); /* XXX: 256 is a magic number for compatibility check. */ MAYHAVE(val, entbuf, 256); if (val == 256) { makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen"); MAYHAVE(val, oentbuf, 256); if (val != 256) fprintf(stderr, "%s was obsoleted. Use %s.\n", oentbuf, entbuf); else val = 64; } if (val < 0 || val > 128) { syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s on %s " "out of range", __func__, val, addr, ifi->ifi_ifname); goto getconfig_free_rti; } rti->rti_prefixlen = (int)val; makeentry(entbuf, sizeof(entbuf), i, "rtflags"); if ((flagstr = (char *)agetstr(entbuf, &bp))) { val = 0; if (strchr(flagstr, 'h')) val |= ND_RA_FLAG_RTPREF_HIGH; if (strchr(flagstr, 'l')) { if ((val & ND_RA_FLAG_RTPREF_HIGH)) { syslog(LOG_ERR, "<%s> the \'h\' and \'l\' route" " preferences are exclusive", __func__); goto getconfig_free_rti; } val |= ND_RA_FLAG_RTPREF_LOW; } } else MAYHAVE(val, entbuf, 256); /* XXX */ if (val == 256) { makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags"); MAYHAVE(val, oentbuf, 256); if (val != 256) { fprintf(stderr, "%s was obsoleted. Use %s.\n", oentbuf, entbuf); } else val = 0; } rti->rti_rtpref = val & ND_RA_FLAG_RTPREF_MASK; if (rti->rti_rtpref == ND_RA_FLAG_RTPREF_RSV) { syslog(LOG_ERR, "<%s> invalid route preference (%02x) " "for %s/%d on %s", __func__, rti->rti_rtpref, addr, rti->rti_prefixlen, ifi->ifi_ifname); goto getconfig_free_rti; } /* * Since the spec does not a default value, we should make * this entry mandatory. However, FreeBSD 4.4 has shipped * with this field being optional, we use the router lifetime * as an ad-hoc default value with a warning message. */ makeentry(entbuf, sizeof(entbuf), i, "rtltime"); MAYHAVE(val64, entbuf, -1); if (val64 == -1) { makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime"); MAYHAVE(val64, oentbuf, -1); if (val64 != -1) fprintf(stderr, "%s was obsoleted. Use %s.\n", oentbuf, entbuf); else { fprintf(stderr, "%s should be specified " "for interface %s.\n", entbuf, ifi->ifi_ifname); val64 = rai->rai_lifetime; } } if (val64 < 0 || val64 > 0xffffffff) { syslog(LOG_ERR, "<%s> route lifetime (%" PRIu64 ") for " "%s/%d on %s out of range", __func__, val64, addr, rti->rti_prefixlen, ifi->ifi_ifname); goto getconfig_free_rti; } rti->rti_ltime = (uint32_t)val64; /* link into chain */ TAILQ_INSERT_TAIL(&rai->rai_route, rti, rti_next); rai->rai_routes++; continue; getconfig_free_rti: free(rti); } /* DNS server and DNS search list information */ for (i = -1; i < MAXRDNSSENT ; i++) { struct rdnss *rdn; struct rdnss_addr *rdna; char *ap; int c; makeentry(entbuf, sizeof(entbuf), i, "rdnss"); addr = (char *)agetstr(entbuf, &bp); if (addr == NULL) continue; ELM_MALLOC(rdn, exit(1)); TAILQ_INIT(&rdn->rd_list); for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { c = strcspn(ap, ","); strncpy(abuf, ap, c); abuf[c] = '\0'; ELM_MALLOC(rdna, goto getconfig_free_rdn); if (inet_pton(AF_INET6, abuf, &rdna->ra_dns) != 1) { syslog(LOG_ERR, "<%s> inet_pton failed for %s", __func__, abuf); free(rdna); goto getconfig_free_rdn; } TAILQ_INSERT_TAIL(&rdn->rd_list, rdna, ra_next); } makeentry(entbuf, sizeof(entbuf), i, "rdnssltime"); MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2)); if ((uint16_t)val < rai->rai_maxinterval || (uint16_t)val > rai->rai_maxinterval * 2) { syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid " "(must be between %d and %d)", entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval, rai->rai_maxinterval * 2); goto getconfig_free_rdn; } rdn->rd_ltime = val; /* link into chain */ TAILQ_INSERT_TAIL(&rai->rai_rdnss, rdn, rd_next); continue; getconfig_free_rdn: while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) { TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next); free(rdna); } free(rdn); } for (i = -1; i < MAXDNSSLENT ; i++) { struct dnssl *dns; struct dnssl_addr *dnsa; char *ap; int c; makeentry(entbuf, sizeof(entbuf), i, "dnssl"); addr = (char *)agetstr(entbuf, &bp); if (addr == NULL) continue; ELM_MALLOC(dns, exit(1)); TAILQ_INIT(&dns->dn_list); for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { c = strcspn(ap, ","); strncpy(abuf, ap, c); abuf[c] = '\0'; ELM_MALLOC(dnsa, goto getconfig_free_dns); dnsa->da_len = dname_labelenc(dnsa->da_dom, abuf); if (dnsa->da_len < 0) { syslog(LOG_ERR, "Invalid dnssl entry: %s", abuf); goto getconfig_free_dns; } syslog(LOG_DEBUG, "<%s>: dnsa->da_len = %d", __func__, dnsa->da_len); TAILQ_INSERT_TAIL(&dns->dn_list, dnsa, da_next); } makeentry(entbuf, sizeof(entbuf), i, "dnsslltime"); MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2)); if ((uint16_t)val < rai->rai_maxinterval || (uint16_t)val > rai->rai_maxinterval * 2) { syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid " "(must be between %d and %d)", entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval, rai->rai_maxinterval * 2); goto getconfig_free_dns; } dns->dn_ltime = val; /* link into chain */ TAILQ_INSERT_TAIL(&rai->rai_dnssl, dns, dn_next); continue; getconfig_free_dns: while ((dnsa = TAILQ_FIRST(&dns->dn_list)) != NULL) { TAILQ_REMOVE(&dns->dn_list, dnsa, da_next); free(dnsa); } free(dns); } /* construct the sending packet */ make_packet(rai); /* * If an entry with the same ifindex exists, remove it first. * Before the removal, RDNSS and DNSSL options with * zero-lifetime will be sent. */ switch (ifi->ifi_state) { case IFI_STATE_UNCONFIGURED: /* UNCONFIGURED -> TRANSITIVE */ error = sock_mc_join(&sock, ifi->ifi_ifindex); if (error) exit(1); ifi->ifi_state = IFI_STATE_TRANSITIVE; ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS; ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL; /* The same two rai mean initial burst */ ifi->ifi_rainfo = rai; ifi->ifi_rainfo_trans = rai; TAILQ_INSERT_TAIL(&railist, rai, rai_next); if (ifi->ifi_ra_timer == NULL) ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, ra_timer_update, ifi, ifi); ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, ifi->ifi_ra_timer); syslog(LOG_DEBUG, "<%s> ifname=%s marked as TRANSITIVE (initial burst).", __func__, ifi->ifi_ifname); break; case IFI_STATE_CONFIGURED: /* CONFIGURED -> TRANSITIVE */ rai_old = ifi->ifi_rainfo; if (rai_old == NULL) { syslog(LOG_ERR, "<%s> ifi_rainfo is NULL" " in IFI_STATE_CONFIGURED.", __func__); ifi = NULL; break; } else { struct rdnss *rdn; struct dnssl *dns; rai_old->rai_lifetime = 0; TAILQ_FOREACH(rdn, &rai_old->rai_rdnss, rd_next) rdn->rd_ltime = 0; TAILQ_FOREACH(dns, &rai_old->rai_dnssl, dn_next) dns->dn_ltime = 0; ifi->ifi_rainfo_trans = rai_old; ifi->ifi_state = IFI_STATE_TRANSITIVE; ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS; ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS; ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, ifi->ifi_ra_timer); syslog(LOG_DEBUG, "<%s> ifname=%s marked as TRANSITIVE" " (transitional burst)", __func__, ifi->ifi_ifname); } ifi->ifi_rainfo = rai; TAILQ_INSERT_TAIL(&railist, rai, rai_next); break; case IFI_STATE_TRANSITIVE: if (ifi->ifi_rainfo != NULL) { if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { /* Reinitialize initial burst */ rm_rainfo(ifi->ifi_rainfo); ifi->ifi_rainfo = rai; ifi->ifi_rainfo_trans = rai; ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS; ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL; } else { /* Replace ifi_rainfo with the new one */ rm_rainfo(ifi->ifi_rainfo); ifi->ifi_rainfo = rai; } TAILQ_INSERT_TAIL(&railist, rai, rai_next); ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, ifi->ifi_ra_timer); } else { /* XXX: NOTREACHED. Being shut down. */ syslog(LOG_ERR, "<%s> %s is shutting down. Skipped.", __func__, ifi->ifi_ifname); rm_rainfo(rai); return (NULL); } break; } return (ifi); getconfig_free_rai: free(rai); return (NULL); } void get_prefix(struct rainfo *rai) { struct ifaddrs *ifap, *ifa; struct prefix *pfx; struct in6_addr *a; struct ifinfo *ifi; char *p, *ep, *m, *lim; char ntopbuf[INET6_ADDRSTRLEN]; if (getifaddrs(&ifap) < 0) { syslog(LOG_ERR, "<%s> can't get interface addresses", __func__); exit(1); } ifi = rai->rai_ifinfo; for (ifa = ifap; ifa; ifa = ifa->ifa_next) { int plen; if (strcmp(ifa->ifa_name, ifi->ifi_ifname) != 0) continue; if (ifa->ifa_addr->sa_family != AF_INET6) continue; a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; if (IN6_IS_ADDR_LINKLOCAL(a)) continue; /* get prefix length */ m = (char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; lim = (char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len; plen = prefixlen(m, lim); if (plen <= 0 || plen > 128) { syslog(LOG_ERR, "<%s> failed to get prefixlen " "or prefix is invalid", __func__); exit(1); } if (plen == 128) /* XXX */ continue; if (find_prefix(rai, a, plen)) { /* ignore a duplicated prefix. */ continue; } /* allocate memory to store prefix info. */ ELM_MALLOC(pfx, exit(1)); /* set prefix, sweep bits outside of prefixlen */ pfx->pfx_prefixlen = plen; memcpy(&pfx->pfx_prefix, a, sizeof(*a)); p = (char *)&pfx->pfx_prefix; ep = (char *)(&pfx->pfx_prefix + 1); while (m < lim && p < ep) *p++ &= *m++; while (p < ep) *p++ = 0x00; if (!inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf))) { syslog(LOG_ERR, "<%s> inet_ntop failed", __func__); exit(1); } syslog(LOG_DEBUG, "<%s> add %s/%d to prefix list on %s", __func__, ntopbuf, pfx->pfx_prefixlen, ifi->ifi_ifname); /* set other fields with protocol defaults */ pfx->pfx_validlifetime = DEF_ADVVALIDLIFETIME; pfx->pfx_preflifetime = DEF_ADVPREFERREDLIFETIME; pfx->pfx_onlinkflg = 1; pfx->pfx_autoconfflg = 1; pfx->pfx_origin = PREFIX_FROM_KERNEL; pfx->pfx_rainfo = rai; /* link into chain */ TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); /* counter increment */ rai->rai_pfxs++; } freeifaddrs(ifap); } static void makeentry(char *buf, size_t len, int id, const char *string) { if (id < 0) strlcpy(buf, string, len); else snprintf(buf, len, "%s%d", string, id); } /* * Add a prefix to the list of specified interface and reconstruct * the outgoing packet. * The prefix must not be in the list. * XXX: other parameters of the prefix (e.g. lifetime) should be * able to be specified. */ static void add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr) { struct prefix *pfx; struct ifinfo *ifi; char ntopbuf[INET6_ADDRSTRLEN]; ifi = rai->rai_ifinfo; ELM_MALLOC(pfx, return); pfx->pfx_prefix = ipr->ipr_prefix.sin6_addr; pfx->pfx_prefixlen = ipr->ipr_plen; pfx->pfx_validlifetime = ipr->ipr_vltime; pfx->pfx_preflifetime = ipr->ipr_pltime; pfx->pfx_onlinkflg = ipr->ipr_raf_onlink; pfx->pfx_autoconfflg = ipr->ipr_raf_auto; pfx->pfx_origin = PREFIX_FROM_DYNAMIC; pfx->pfx_rainfo = rai; TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s", __func__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, sizeof(ntopbuf)), ipr->ipr_plen, ifi->ifi_ifname); rai->rai_pfxs++; } /* * Delete a prefix to the list of specified interface and reconstruct * the outgoing packet. * The prefix must be in the list. */ void delete_prefix(struct prefix *pfx) { struct rainfo *rai; struct ifinfo *ifi; char ntopbuf[INET6_ADDRSTRLEN]; rai = pfx->pfx_rainfo; ifi = rai->rai_ifinfo; TAILQ_REMOVE(&rai->rai_prefix, pfx, pfx_next); syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s", __func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname); if (pfx->pfx_timer) rtadvd_remove_timer(pfx->pfx_timer); free(pfx); rai->rai_pfxs--; } void invalidate_prefix(struct prefix *pfx) { struct timespec timo; struct rainfo *rai; struct ifinfo *ifi; char ntopbuf[INET6_ADDRSTRLEN]; rai = pfx->pfx_rainfo; ifi = rai->rai_ifinfo; if (pfx->pfx_timer) { /* sanity check */ syslog(LOG_ERR, "<%s> assumption failure: timer already exists", __func__); exit(1); } syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, " "will expire in %ld seconds", __func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname, (long)prefix_timo); /* set the expiration timer */ pfx->pfx_timer = rtadvd_add_timer(prefix_timeout, NULL, pfx, NULL); if (pfx->pfx_timer == NULL) { syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. " "remove the prefix", __func__); delete_prefix(pfx); } timo.tv_sec = prefix_timo; timo.tv_nsec = 0; rtadvd_set_timer(&timo, pfx->pfx_timer); } static struct rtadvd_timer * prefix_timeout(void *arg) { delete_prefix((struct prefix *)arg); return (NULL); } void update_prefix(struct prefix *pfx) { struct rainfo *rai; struct ifinfo *ifi; char ntopbuf[INET6_ADDRSTRLEN]; rai = pfx->pfx_rainfo; ifi = rai->rai_ifinfo; if (pfx->pfx_timer == NULL) { /* sanity check */ syslog(LOG_ERR, "<%s> assumption failure: timer does not exist", __func__); exit(1); } syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s", __func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname); /* stop the expiration timer */ rtadvd_remove_timer(pfx->pfx_timer); pfx->pfx_timer = NULL; } /* * Try to get an in6_prefixreq contents for a prefix which matches * ipr->ipr_prefix and ipr->ipr_plen and belongs to * the interface whose name is ipr->ipr_name[]. */ static int init_prefix(struct in6_prefixreq *ipr) { #if 0 int s; if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno)); exit(1); } if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) { syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__, strerror(errno)); ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; ipr->ipr_raf_onlink = 1; ipr->ipr_raf_auto = 1; /* omit other field initialization */ } else if (ipr->ipr_origin < PR_ORIG_RR) { char ntopbuf[INET6_ADDRSTRLEN]; syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is" "lower than PR_ORIG_RR(router renumbering)." "This should not happen if I am router", __func__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, sizeof(ntopbuf)), ipr->ipr_origin); close(s); return (1); } close(s); return (0); #else ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; ipr->ipr_raf_onlink = 1; ipr->ipr_raf_auto = 1; return (0); #endif } void make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen) { struct in6_prefixreq ipr; memset(&ipr, 0, sizeof(ipr)); if (if_indextoname(ifindex, ipr.ipr_name) == NULL) { syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't " "exist. This should not happen! %s", __func__, ifindex, strerror(errno)); exit(1); } ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix); ipr.ipr_prefix.sin6_family = AF_INET6; ipr.ipr_prefix.sin6_addr = *addr; ipr.ipr_plen = plen; if (init_prefix(&ipr)) return; /* init failed by some error */ add_prefix(rai, &ipr); } void make_packet(struct rainfo *rai) { size_t packlen, lladdroptlen = 0; char *buf; struct nd_router_advert *ra; struct nd_opt_prefix_info *ndopt_pi; struct nd_opt_mtu *ndopt_mtu; struct nd_opt_route_info *ndopt_rti; struct rtinfo *rti; struct nd_opt_rdnss *ndopt_rdnss; struct rdnss *rdn; struct nd_opt_dnssl *ndopt_dnssl; struct dnssl *dns; size_t len; struct prefix *pfx; struct ifinfo *ifi; ifi = rai->rai_ifinfo; /* calculate total length */ packlen = sizeof(struct nd_router_advert); if (rai->rai_advlinkopt) { if ((lladdroptlen = lladdropt_length(&ifi->ifi_sdl)) == 0) { syslog(LOG_INFO, "<%s> link-layer address option has" " null length on %s. Treat as not included.", __func__, ifi->ifi_ifname); rai->rai_advlinkopt = 0; } packlen += lladdroptlen; } if (rai->rai_pfxs) packlen += sizeof(struct nd_opt_prefix_info) * rai->rai_pfxs; if (rai->rai_linkmtu) packlen += sizeof(struct nd_opt_mtu); TAILQ_FOREACH(rti, &rai->rai_route, rti_next) packlen += sizeof(struct nd_opt_route_info) + ((rti->rti_prefixlen + 0x3f) >> 6) * 8; TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) { struct rdnss_addr *rdna; packlen += sizeof(struct nd_opt_rdnss); TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) packlen += sizeof(rdna->ra_dns); } TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) { struct dnssl_addr *dnsa; packlen += sizeof(struct nd_opt_dnssl); len = 0; TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) len += dnsa->da_len; /* A zero octet and 8 octet boundary */ len++; len += (len % 8) ? 8 - len % 8 : 0; packlen += len; } /* allocate memory for the packet */ if ((buf = malloc(packlen)) == NULL) { syslog(LOG_ERR, "<%s> can't get enough memory for an RA packet", __func__); exit(1); } memset(buf, 0, packlen); if (rai->rai_ra_data) /* Free old data if any. */ free(rai->rai_ra_data); rai->rai_ra_data = buf; /* XXX: what if packlen > 576? */ rai->rai_ra_datalen = packlen; /* * construct the packet */ ra = (struct nd_router_advert *)buf; ra->nd_ra_type = ND_ROUTER_ADVERT; ra->nd_ra_code = 0; ra->nd_ra_cksum = 0; ra->nd_ra_curhoplimit = (uint8_t)(0xff & rai->rai_hoplimit); /* * XXX: the router preference field, which is a 2-bit field, should be * initialized before other fields. */ ra->nd_ra_flags_reserved = 0xff & rai->rai_rtpref; ra->nd_ra_flags_reserved |= rai->rai_managedflg ? ND_RA_FLAG_MANAGED : 0; ra->nd_ra_flags_reserved |= rai->rai_otherflg ? ND_RA_FLAG_OTHER : 0; #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG ra->nd_ra_flags_reserved |= rai->rai_ipv6onlyflg ? ND_RA_FLAG_IPV6_ONLY : 0; #endif ra->nd_ra_router_lifetime = htons(rai->rai_lifetime); ra->nd_ra_reachable = htonl(rai->rai_reachabletime); ra->nd_ra_retransmit = htonl(rai->rai_retranstimer); buf += sizeof(*ra); if (rai->rai_advlinkopt) { lladdropt_fill(&ifi->ifi_sdl, (struct nd_opt_hdr *)buf); buf += lladdroptlen; } if (rai->rai_linkmtu) { ndopt_mtu = (struct nd_opt_mtu *)buf; ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU; ndopt_mtu->nd_opt_mtu_len = 1; ndopt_mtu->nd_opt_mtu_reserved = 0; ndopt_mtu->nd_opt_mtu_mtu = htonl(rai->rai_linkmtu); buf += sizeof(struct nd_opt_mtu); } TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) { uint32_t vltime, pltime; struct timespec now; ndopt_pi = (struct nd_opt_prefix_info *)buf; ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION; ndopt_pi->nd_opt_pi_len = 4; ndopt_pi->nd_opt_pi_prefix_len = pfx->pfx_prefixlen; ndopt_pi->nd_opt_pi_flags_reserved = 0; if (pfx->pfx_onlinkflg) ndopt_pi->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_ONLINK; if (pfx->pfx_autoconfflg) ndopt_pi->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO; if (pfx->pfx_timer) vltime = 0; else { if (pfx->pfx_vltimeexpire || pfx->pfx_pltimeexpire) clock_gettime(CLOCK_MONOTONIC_FAST, &now); if (pfx->pfx_vltimeexpire == 0) vltime = pfx->pfx_validlifetime; else vltime = ((time_t)pfx->pfx_vltimeexpire > now.tv_sec) ? pfx->pfx_vltimeexpire - now.tv_sec : 0; } if (pfx->pfx_timer) pltime = 0; else { if (pfx->pfx_pltimeexpire == 0) pltime = pfx->pfx_preflifetime; else pltime = ((time_t)pfx->pfx_pltimeexpire > now.tv_sec) ? pfx->pfx_pltimeexpire - now.tv_sec : 0; } if (vltime < pltime) { /* * this can happen if vltime is decrement but pltime * is not. */ pltime = vltime; } ndopt_pi->nd_opt_pi_valid_time = htonl(vltime); ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime); ndopt_pi->nd_opt_pi_reserved2 = 0; ndopt_pi->nd_opt_pi_prefix = pfx->pfx_prefix; buf += sizeof(struct nd_opt_prefix_info); } TAILQ_FOREACH(rti, &rai->rai_route, rti_next) { uint8_t psize = (rti->rti_prefixlen + 0x3f) >> 6; ndopt_rti = (struct nd_opt_route_info *)buf; ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO; ndopt_rti->nd_opt_rti_len = 1 + psize; ndopt_rti->nd_opt_rti_prefixlen = rti->rti_prefixlen; ndopt_rti->nd_opt_rti_flags = 0xff & rti->rti_rtpref; ndopt_rti->nd_opt_rti_lifetime = htonl(rti->rti_ltime); memcpy(ndopt_rti + 1, &rti->rti_prefix, psize * 8); buf += sizeof(struct nd_opt_route_info) + psize * 8; } TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) { struct rdnss_addr *rdna; ndopt_rdnss = (struct nd_opt_rdnss *)buf; ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS; ndopt_rdnss->nd_opt_rdnss_len = 0; ndopt_rdnss->nd_opt_rdnss_reserved = 0; ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdn->rd_ltime); buf += sizeof(struct nd_opt_rdnss); TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) { memcpy(buf, &rdna->ra_dns, sizeof(rdna->ra_dns)); buf += sizeof(rdna->ra_dns); } /* Length field should be in 8 octets */ ndopt_rdnss->nd_opt_rdnss_len = (buf - (char *)ndopt_rdnss) / 8; syslog(LOG_DEBUG, "<%s>: nd_opt_dnss_len = %d", __func__, ndopt_rdnss->nd_opt_rdnss_len); } TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) { struct dnssl_addr *dnsa; ndopt_dnssl = (struct nd_opt_dnssl *)buf; ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL; ndopt_dnssl->nd_opt_dnssl_len = 0; ndopt_dnssl->nd_opt_dnssl_reserved = 0; ndopt_dnssl->nd_opt_dnssl_lifetime = htonl(dns->dn_ltime); buf += sizeof(*ndopt_dnssl); TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) { memcpy(buf, dnsa->da_dom, dnsa->da_len); buf += dnsa->da_len; } /* A zero octet after encoded DNS server list. */ *buf++ = '\0'; /* Padding to next 8 octets boundary */ len = buf - (char *)ndopt_dnssl; len += (len % 8) ? 8 - len % 8 : 0; buf = (char *)ndopt_dnssl + len; /* Length field must be in 8 octets */ ndopt_dnssl->nd_opt_dnssl_len = len / 8; syslog(LOG_DEBUG, "<%s>: nd_opt_dnssl_len = %d", __func__, ndopt_dnssl->nd_opt_dnssl_len); } return; } Index: head/usr.sbin/rtadvd/rtadvd.c =================================================================== --- head/usr.sbin/rtadvd/rtadvd.c (revision 340097) +++ head/usr.sbin/rtadvd/rtadvd.c (revision 340098) @@ -1,1929 +1,1929 @@ /* $FreeBSD$ */ /* $KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 itojun Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * Copyright (C) 2011 Hiroki Sato * All rights reserved. * * 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. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #include "rtadvd.h" #include "if.h" #include "rrenum.h" #include "advcap.h" #include "timer_subr.h" #include "timer.h" #include "config.h" #include "control.h" #include "control_server.h" #define RTADV_TYPE2BITMASK(type) (0x1 << type) struct msghdr rcvmhdr; static char *rcvcmsgbuf; static size_t rcvcmsgbuflen; static char *sndcmsgbuf = NULL; static size_t sndcmsgbuflen; struct msghdr sndmhdr; struct iovec rcviov[2]; struct iovec sndiov[2]; struct sockaddr_in6 rcvfrom; static const char *pidfilename = _PATH_RTADVDPID; const char *conffile = _PATH_RTADVDCONF; static struct pidfh *pfh; static int dflag, sflag; static int wait_shutdown; #define PFD_RAWSOCK 0 #define PFD_RTSOCK 1 #define PFD_CSOCK 2 #define PFD_MAX 3 struct railist_head_t railist = TAILQ_HEAD_INITIALIZER(railist); struct ifilist_head_t ifilist = TAILQ_HEAD_INITIALIZER(ifilist); struct nd_optlist { TAILQ_ENTRY(nd_optlist) nol_next; struct nd_opt_hdr *nol_opt; }; union nd_opt { struct nd_opt_hdr *opt_array[9]; struct { struct nd_opt_hdr *zero; struct nd_opt_hdr *src_lladdr; struct nd_opt_hdr *tgt_lladdr; struct nd_opt_prefix_info *pi; struct nd_opt_rd_hdr *rh; struct nd_opt_mtu *mtu; TAILQ_HEAD(, nd_optlist) opt_list; } nd_opt_each; }; #define opt_src_lladdr nd_opt_each.src_lladdr #define opt_tgt_lladdr nd_opt_each.tgt_lladdr #define opt_pi nd_opt_each.pi #define opt_rh nd_opt_each.rh #define opt_mtu nd_opt_each.mtu #define opt_list nd_opt_each.opt_list #define NDOPT_FLAG_SRCLINKADDR (1 << 0) #define NDOPT_FLAG_TGTLINKADDR (1 << 1) #define NDOPT_FLAG_PREFIXINFO (1 << 2) #define NDOPT_FLAG_RDHDR (1 << 3) #define NDOPT_FLAG_MTU (1 << 4) #define NDOPT_FLAG_RDNSS (1 << 5) #define NDOPT_FLAG_DNSSL (1 << 6) static uint32_t ndopt_flags[] = { [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR, [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR, [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO, [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR, [ND_OPT_MTU] = NDOPT_FLAG_MTU, [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS, [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL, }; static void rtadvd_shutdown(void); static void sock_open(struct sockinfo *); static void rtsock_open(struct sockinfo *); static void rtadvd_input(struct sockinfo *); static void rs_input(int, struct nd_router_solicit *, struct in6_pktinfo *, struct sockaddr_in6 *); static void ra_input(int, struct nd_router_advert *, struct in6_pktinfo *, struct sockaddr_in6 *); static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *, struct sockaddr_in6 *); static int nd6_options(struct nd_opt_hdr *, int, union nd_opt *, uint32_t); static void free_ndopts(union nd_opt *); static void rtmsg_input(struct sockinfo *); static void set_short_delay(struct ifinfo *); static int check_accept_rtadv(int); static void usage(void) { fprintf(stderr, "usage: rtadvd [-dDfRs] " "[-c configfile] [-C ctlsock] [-M ifname] [-p pidfile]\n"); exit(1); } int main(int argc, char *argv[]) { struct pollfd set[PFD_MAX]; struct timespec *timeout; int i, ch; int fflag = 0, logopt; int error; pid_t pid, otherpid; /* get command line options and arguments */ while ((ch = getopt(argc, argv, "c:C:dDfhM:p:Rs")) != -1) { switch (ch) { case 'c': conffile = optarg; break; case 'C': ctrlsock.si_name = optarg; break; case 'd': dflag++; break; case 'D': dflag += 3; break; case 'f': fflag = 1; break; case 'M': mcastif = optarg; break; case 'R': fprintf(stderr, "rtadvd: " "the -R option is currently ignored.\n"); /* accept_rr = 1; */ /* run anyway... */ break; case 's': sflag = 1; break; case 'p': pidfilename = optarg; break; default: usage(); } } argc -= optind; argv += optind; logopt = LOG_NDELAY | LOG_PID; if (fflag) logopt |= LOG_PERROR; openlog("rtadvd", logopt, LOG_DAEMON); /* set log level */ if (dflag > 2) (void)setlogmask(LOG_UPTO(LOG_DEBUG)); else if (dflag > 1) (void)setlogmask(LOG_UPTO(LOG_INFO)); else if (dflag > 0) (void)setlogmask(LOG_UPTO(LOG_NOTICE)); else (void)setlogmask(LOG_UPTO(LOG_ERR)); /* timer initialization */ rtadvd_timer_init(); pfh = pidfile_open(pidfilename, 0600, &otherpid); if (pfh == NULL) { if (errno == EEXIST) errx(1, "%s already running, pid: %d", getprogname(), otherpid); syslog(LOG_ERR, "failed to open the pid file %s, run anyway.", pidfilename); } if (!fflag) daemon(1, 0); sock_open(&sock); update_ifinfo(&ifilist, UPDATE_IFINFO_ALL); for (i = 0; i < argc; i++) update_persist_ifinfo(&ifilist, argv[i]); csock_open(&ctrlsock, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); if (ctrlsock.si_fd == -1) { syslog(LOG_ERR, "cannot open control socket: %s", strerror(errno)); exit(1); } /* record the current PID */ pid = getpid(); pidfile_write(pfh); set[PFD_RAWSOCK].fd = sock.si_fd; set[PFD_RAWSOCK].events = POLLIN; if (sflag == 0) { rtsock_open(&rtsock); set[PFD_RTSOCK].fd = rtsock.si_fd; set[PFD_RTSOCK].events = POLLIN; } else set[PFD_RTSOCK].fd = -1; set[PFD_CSOCK].fd = ctrlsock.si_fd; set[PFD_CSOCK].events = POLLIN; signal(SIGTERM, set_do_shutdown); signal(SIGINT, set_do_shutdown); signal(SIGHUP, set_do_reload); error = csock_listen(&ctrlsock); if (error) { syslog(LOG_ERR, "cannot listen control socket: %s", strerror(errno)); exit(1); } /* load configuration file */ set_do_reload(0); while (1) { if (is_do_shutdown()) rtadvd_shutdown(); if (is_do_reload()) { loadconfig_ifname(reload_ifname()); if (reload_ifname() == NULL) syslog(LOG_INFO, "configuration file reloaded."); else syslog(LOG_INFO, "configuration file for %s reloaded.", reload_ifname()); reset_do_reload(); } /* timeout handler update for active interfaces */ rtadvd_update_timeout_handler(); /* timer expiration check and reset the timer */ timeout = rtadvd_check_timer(); if (timeout != NULL) { syslog(LOG_DEBUG, "<%s> set timer to %ld:%ld. waiting for " "inputs or timeout", __func__, (long int)timeout->tv_sec, (long int)timeout->tv_nsec / 1000); } else { syslog(LOG_DEBUG, "<%s> there's no timer. waiting for inputs", __func__); } if ((i = poll(set, sizeof(set)/sizeof(set[0]), timeout ? (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000 / 1000) : INFTIM)) < 0) { /* EINTR would occur if a signal was delivered */ if (errno != EINTR) syslog(LOG_ERR, "poll() failed: %s", strerror(errno)); continue; } if (i == 0) /* timeout */ continue; if (rtsock.si_fd != -1 && set[PFD_RTSOCK].revents & POLLIN) rtmsg_input(&rtsock); if (set[PFD_RAWSOCK].revents & POLLIN) rtadvd_input(&sock); if (set[PFD_CSOCK].revents & POLLIN) { int fd; fd = csock_accept(&ctrlsock); if (fd == -1) syslog(LOG_ERR, "cannot accept() control socket: %s", strerror(errno)); else { cm_handler_server(fd); close(fd); } } } exit(0); /* NOTREACHED */ } static void rtadvd_shutdown(void) { struct ifinfo *ifi; struct rainfo *rai; struct rdnss *rdn; struct dnssl *dns; if (wait_shutdown) { syslog(LOG_INFO, "waiting expiration of the all RA timers."); TAILQ_FOREACH(ifi, &ifilist, ifi_next) { /* * Ignore !IFF_UP interfaces in waiting for shutdown. */ if (!(ifi->ifi_flags & IFF_UP) && ifi->ifi_ra_timer != NULL) { ifi->ifi_state = IFI_STATE_UNCONFIGURED; rtadvd_remove_timer(ifi->ifi_ra_timer); ifi->ifi_ra_timer = NULL; syslog(LOG_DEBUG, "<%s> %s(idx=%d) is down. " "Timer removed and marked as UNCONFIGURED.", __func__, ifi->ifi_ifname, ifi->ifi_ifindex); } } TAILQ_FOREACH(ifi, &ifilist, ifi_next) { if (ifi->ifi_ra_timer != NULL) break; } if (ifi == NULL) { syslog(LOG_NOTICE, "gracefully terminated."); exit(0); } sleep(1); return; } syslog(LOG_DEBUG, "<%s> cease to be an advertising router", __func__); wait_shutdown = 1; TAILQ_FOREACH(rai, &railist, rai_next) { rai->rai_lifetime = 0; TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) rdn->rd_ltime = 0; TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) dns->dn_ltime = 0; } TAILQ_FOREACH(ifi, &ifilist, ifi_next) { if (!ifi->ifi_persist) continue; if (ifi->ifi_state == IFI_STATE_UNCONFIGURED) continue; if (ifi->ifi_ra_timer == NULL) continue; if (ifi->ifi_ra_lastsent.tv_sec == 0 && ifi->ifi_ra_lastsent.tv_nsec == 0 && ifi->ifi_ra_timer != NULL) { /* * When RA configured but never sent, * ignore the IF immediately. */ rtadvd_remove_timer(ifi->ifi_ra_timer); ifi->ifi_ra_timer = NULL; ifi->ifi_state = IFI_STATE_UNCONFIGURED; continue; } ifi->ifi_state = IFI_STATE_TRANSITIVE; /* Mark as the shut-down state. */ ifi->ifi_rainfo_trans = ifi->ifi_rainfo; ifi->ifi_rainfo = NULL; ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS; ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS; ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, ifi->ifi_ra_timer); } syslog(LOG_NOTICE, "final RA transmission started."); pidfile_remove(pfh); csock_close(&ctrlsock); } static void rtmsg_input(struct sockinfo *s) { int n, type, ifindex = 0, plen; size_t len; char msg[2048], *next, *lim; char ifname[IFNAMSIZ]; struct if_announcemsghdr *ifan; struct rt_msghdr *rtm; struct prefix *pfx; struct rainfo *rai; struct in6_addr *addr; struct ifinfo *ifi; char addrbuf[INET6_ADDRSTRLEN]; int prefixchange = 0; if (s == NULL) { syslog(LOG_ERR, "<%s> internal error", __func__); exit(1); } n = read(s->si_fd, msg, sizeof(msg)); rtm = (struct rt_msghdr *)msg; syslog(LOG_DEBUG, "<%s> received a routing message " "(type = %d, len = %d)", __func__, rtm->rtm_type, n); if (n > rtm->rtm_msglen) { /* * This usually won't happen for messages received on * a routing socket. */ syslog(LOG_DEBUG, "<%s> received data length is larger than " "1st routing message len. multiple messages? " "read %d bytes, but 1st msg len = %d", __func__, n, rtm->rtm_msglen); #if 0 /* adjust length */ n = rtm->rtm_msglen; #endif } lim = msg + n; for (next = msg; next < lim; next += len) { int oldifflags; next = get_next_msg(next, lim, 0, &len, RTADV_TYPE2BITMASK(RTM_ADD) | RTADV_TYPE2BITMASK(RTM_DELETE) | RTADV_TYPE2BITMASK(RTM_NEWADDR) | RTADV_TYPE2BITMASK(RTM_DELADDR) | RTADV_TYPE2BITMASK(RTM_IFINFO) | RTADV_TYPE2BITMASK(RTM_IFANNOUNCE)); if (len == 0) break; type = ((struct rt_msghdr *)next)->rtm_type; switch (type) { case RTM_ADD: case RTM_DELETE: ifindex = get_rtm_ifindex(next); break; case RTM_NEWADDR: case RTM_DELADDR: ifindex = (int)((struct ifa_msghdr *)next)->ifam_index; break; case RTM_IFINFO: ifindex = (int)((struct if_msghdr *)next)->ifm_index; break; case RTM_IFANNOUNCE: ifan = (struct if_announcemsghdr *)next; switch (ifan->ifan_what) { case IFAN_ARRIVAL: case IFAN_DEPARTURE: break; default: syslog(LOG_DEBUG, "<%s:%d> unknown ifan msg (ifan_what=%d)", __func__, __LINE__, ifan->ifan_what); continue; } syslog(LOG_DEBUG, "<%s>: if_announcemsg (idx=%d:%d)", __func__, ifan->ifan_index, ifan->ifan_what); switch (ifan->ifan_what) { case IFAN_ARRIVAL: syslog(LOG_NOTICE, "interface added (idx=%d)", ifan->ifan_index); update_ifinfo(&ifilist, ifan->ifan_index); loadconfig_index(ifan->ifan_index); break; case IFAN_DEPARTURE: syslog(LOG_NOTICE, "interface removed (idx=%d)", ifan->ifan_index); rm_ifinfo_index(ifan->ifan_index); /* Clear ifi_ifindex */ TAILQ_FOREACH(ifi, &ifilist, ifi_next) { if (ifi->ifi_ifindex == ifan->ifan_index) { ifi->ifi_ifindex = 0; break; } } update_ifinfo(&ifilist, ifan->ifan_index); break; } continue; default: /* should not reach here */ syslog(LOG_DEBUG, "<%s:%d> unknown rtmsg %d on %s", __func__, __LINE__, type, if_indextoname(ifindex, ifname)); continue; } ifi = if_indextoifinfo(ifindex); if (ifi == NULL) { syslog(LOG_DEBUG, "<%s> ifinfo not found for idx=%d. Why?", __func__, ifindex); continue; } rai = ifi->ifi_rainfo; if (rai == NULL) { syslog(LOG_DEBUG, "<%s> route changed on " "non advertising interface(%s)", __func__, ifi->ifi_ifname); continue; } oldifflags = ifi->ifi_flags; /* init ifflags because it may have changed */ update_ifinfo(&ifilist, ifindex); switch (type) { case RTM_ADD: if (sflag) break; /* we aren't interested in prefixes */ addr = get_addr(msg); plen = get_prefixlen(msg); /* sanity check for plen */ /* as RFC2373, prefixlen is at least 4 */ if (plen < 4 || plen > 127) { syslog(LOG_INFO, "<%s> new interface route's" "plen %d is invalid for a prefix", __func__, plen); break; } pfx = find_prefix(rai, addr, plen); if (pfx) { if (pfx->pfx_timer) { /* * If the prefix has been invalidated, * make it available again. */ update_prefix(pfx); prefixchange = 1; } else syslog(LOG_DEBUG, "<%s> new prefix(%s/%d) " "added on %s, " "but it was already in list", __func__, inet_ntop(AF_INET6, addr, (char *)addrbuf, sizeof(addrbuf)), plen, ifi->ifi_ifname); break; } make_prefix(rai, ifindex, addr, plen); prefixchange = 1; break; case RTM_DELETE: if (sflag) break; addr = get_addr(msg); plen = get_prefixlen(msg); /* sanity check for plen */ /* as RFC2373, prefixlen is at least 4 */ if (plen < 4 || plen > 127) { syslog(LOG_INFO, "<%s> deleted interface route's " "plen %d is invalid for a prefix", __func__, plen); break; } pfx = find_prefix(rai, addr, plen); if (pfx == NULL) { syslog(LOG_DEBUG, "<%s> prefix(%s/%d) was deleted on %s, " "but it was not in list", __func__, inet_ntop(AF_INET6, addr, (char *)addrbuf, sizeof(addrbuf)), plen, ifi->ifi_ifname); break; } invalidate_prefix(pfx); prefixchange = 1; break; case RTM_NEWADDR: case RTM_DELADDR: case RTM_IFINFO: break; default: /* should not reach here */ syslog(LOG_DEBUG, "<%s:%d> unknown rtmsg %d on %s", __func__, __LINE__, type, if_indextoname(ifindex, ifname)); return; } /* check if an interface flag is changed */ if ((oldifflags & IFF_UP) && /* UP to DOWN */ !(ifi->ifi_flags & IFF_UP)) { syslog(LOG_NOTICE, "ifi_ifname); rtadvd_remove_timer(ifi->ifi_ra_timer); ifi->ifi_ra_timer = NULL; } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */ (ifi->ifi_flags & IFF_UP)) { syslog(LOG_NOTICE, "interface %s becomes up. restart timer.", ifi->ifi_ifname); ifi->ifi_state = IFI_STATE_TRANSITIVE; ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS; ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL; ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, ra_timer_update, ifi, ifi); ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, ifi->ifi_ra_timer); } else if (prefixchange && (ifi->ifi_flags & IFF_UP)) { /* * An advertised prefix has been added or invalidated. * Will notice the change in a short delay. */ set_short_delay(ifi); } } return; } void rtadvd_input(struct sockinfo *s) { ssize_t i; int *hlimp = NULL; #ifdef OLDRAWSOCKET struct ip6_hdr *ip; #endif struct icmp6_hdr *icp; int ifindex = 0; struct cmsghdr *cm; struct in6_pktinfo *pi = NULL; char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ]; struct in6_addr dst = in6addr_any; struct ifinfo *ifi; syslog(LOG_DEBUG, "<%s> enter", __func__); if (s == NULL) { syslog(LOG_ERR, "<%s> internal error", __func__); exit(1); } /* * Get message. We reset msg_controllen since the field could * be modified if we had received a message before setting * receive options. */ rcvmhdr.msg_controllen = rcvcmsgbuflen; if ((i = recvmsg(s->si_fd, &rcvmhdr, 0)) < 0) return; /* extract optional information via Advanced API */ for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr); cm; cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) { if (cm->cmsg_level == IPPROTO_IPV6 && cm->cmsg_type == IPV6_PKTINFO && cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) { pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); ifindex = pi->ipi6_ifindex; dst = pi->ipi6_addr; } if (cm->cmsg_level == IPPROTO_IPV6 && cm->cmsg_type == IPV6_HOPLIMIT && cm->cmsg_len == CMSG_LEN(sizeof(int))) hlimp = (int *)CMSG_DATA(cm); } if (ifindex == 0) { syslog(LOG_ERR, "failed to get receiving interface"); return; } if (hlimp == NULL) { syslog(LOG_ERR, "failed to get receiving hop limit"); return; } /* * If we happen to receive data on an interface which is now gone * or down, just discard the data. */ ifi = if_indextoifinfo(pi->ipi6_ifindex); if (ifi == NULL || !(ifi->ifi_flags & IFF_UP)) { syslog(LOG_INFO, "<%s> received data on a disabled interface (%s)", __func__, (ifi == NULL) ? "[gone]" : ifi->ifi_ifname); return; } #ifdef OLDRAWSOCKET if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) { syslog(LOG_ERR, "packet size(%d) is too short", i); return; } ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base; icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */ #else if ((size_t)i < sizeof(struct icmp6_hdr)) { syslog(LOG_ERR, "packet size(%zd) is too short", i); return; } icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base; #endif switch (icp->icmp6_type) { case ND_ROUTER_SOLICIT: /* * Message verification - RFC 4861 6.1.1 * XXX: these checks must be done in the kernel as well, * but we can't completely rely on them. */ if (*hlimp != 255) { syslog(LOG_NOTICE, "RS with invalid hop limit(%d) " "received from %s on %s", *hlimp, inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } if (icp->icmp6_code) { syslog(LOG_NOTICE, "RS with invalid ICMP6 code(%d) " "received from %s on %s", icp->icmp6_code, inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } if ((size_t)i < sizeof(struct nd_router_solicit)) { syslog(LOG_NOTICE, "RS from %s on %s does not have enough " "length (len = %zd)", inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf), i); return; } rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom); break; case ND_ROUTER_ADVERT: /* * Message verification - RFC 4861 6.1.2 * XXX: there's the same dilemma as above... */ if (!IN6_IS_ADDR_LINKLOCAL(&rcvfrom.sin6_addr)) { syslog(LOG_NOTICE, "RA with non-linklocal source address " "received from %s on %s", inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } if (*hlimp != 255) { syslog(LOG_NOTICE, "RA with invalid hop limit(%d) " "received from %s on %s", *hlimp, inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } if (icp->icmp6_code) { syslog(LOG_NOTICE, "RA with invalid ICMP6 code(%d) " "received from %s on %s", icp->icmp6_code, inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } if ((size_t)i < sizeof(struct nd_router_advert)) { syslog(LOG_NOTICE, "RA from %s on %s does not have enough " "length (len = %zd)", inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf), i); return; } ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom); break; case ICMP6_ROUTER_RENUMBERING: if (mcastif == NULL) { syslog(LOG_ERR, "received a router renumbering " "message, but not allowed to be accepted"); break; } rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom, &dst); break; default: /* * Note that this case is POSSIBLE, especially just * after invocation of the daemon. This is because we * could receive message after opening the socket and * before setting ICMP6 type filter(see sock_open()). */ syslog(LOG_ERR, "invalid icmp type(%d)", icp->icmp6_type); return; } return; } static void rs_input(int len, struct nd_router_solicit *rs, struct in6_pktinfo *pi, struct sockaddr_in6 *from) { char ntopbuf[INET6_ADDRSTRLEN]; char ifnamebuf[IFNAMSIZ]; union nd_opt ndopts; struct rainfo *rai; struct ifinfo *ifi; struct soliciter *sol; syslog(LOG_DEBUG, "<%s> RS received from %s on %s", __func__, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); /* ND option check */ memset(&ndopts, 0, sizeof(ndopts)); TAILQ_INIT(&ndopts.opt_list); if (nd6_options((struct nd_opt_hdr *)(rs + 1), len - sizeof(struct nd_router_solicit), &ndopts, NDOPT_FLAG_SRCLINKADDR)) { syslog(LOG_INFO, "<%s> ND option check failed for an RS from %s on %s", __func__, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } /* * If the IP source address is the unspecified address, there * must be no source link-layer address option in the message. * (RFC 4861 6.1.1) */ if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) && ndopts.opt_src_lladdr) { syslog(LOG_INFO, "<%s> RS from unspecified src on %s has a link-layer" " address option", __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf)); goto done; } ifi = if_indextoifinfo(pi->ipi6_ifindex); if (ifi == NULL) { syslog(LOG_INFO, "<%s> if (idx=%d) not found. Why?", __func__, pi->ipi6_ifindex); goto done; } rai = ifi->ifi_rainfo; if (rai == NULL) { syslog(LOG_INFO, "<%s> RS received on non advertising interface(%s)", __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf)); goto done; } rai->rai_ifinfo->ifi_rsinput++; /* * Decide whether to send RA according to the rate-limit * consideration. */ /* record sockaddr waiting for RA, if possible */ sol = (struct soliciter *)malloc(sizeof(*sol)); if (sol) { sol->sol_addr = *from; /* XXX RFC 2553 need clarification on flowinfo */ sol->sol_addr.sin6_flowinfo = 0; TAILQ_INSERT_TAIL(&rai->rai_soliciter, sol, sol_next); } /* * If there is already a waiting RS packet, don't * update the timer. */ if (ifi->ifi_rs_waitcount++) goto done; set_short_delay(ifi); done: free_ndopts(&ndopts); return; } static void set_short_delay(struct ifinfo *ifi) { long delay; /* must not be greater than 1000000 */ struct timespec interval, now, min_delay, tm_tmp, *rest; if (ifi->ifi_ra_timer == NULL) return; /* * Compute a random delay. If the computed value * corresponds to a time later than the time the next * multicast RA is scheduled to be sent, ignore the random * delay and send the advertisement at the * already-scheduled time. RFC 4861 6.2.6 */ delay = arc4random_uniform(MAX_RA_DELAY_TIME); interval.tv_sec = 0; interval.tv_nsec = delay * 1000; rest = rtadvd_timer_rest(ifi->ifi_ra_timer); if (TS_CMP(rest, &interval, <)) { syslog(LOG_DEBUG, "<%s> random delay is larger than " "the rest of the current timer", __func__); interval = *rest; } /* * If we sent a multicast Router Advertisement within * the last MIN_DELAY_BETWEEN_RAS seconds, schedule * the advertisement to be sent at a time corresponding to * MIN_DELAY_BETWEEN_RAS plus the random value after the * previous advertisement was sent. */ clock_gettime(CLOCK_MONOTONIC_FAST, &now); TS_SUB(&now, &ifi->ifi_ra_lastsent, &tm_tmp); min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS; min_delay.tv_nsec = 0; if (TS_CMP(&tm_tmp, &min_delay, <)) { TS_SUB(&min_delay, &tm_tmp, &min_delay); TS_ADD(&min_delay, &interval, &interval); } rtadvd_set_timer(&interval, ifi->ifi_ra_timer); } static int check_accept_rtadv(int idx) { struct ifinfo *ifi; TAILQ_FOREACH(ifi, &ifilist, ifi_next) { if (ifi->ifi_ifindex == idx) break; } if (ifi == NULL) { syslog(LOG_DEBUG, "<%s> if (idx=%d) not found. Why?", __func__, idx); return (0); } #if (__FreeBSD_version < 900000) /* * RA_RECV: !ip6.forwarding && ip6.accept_rtadv * RA_SEND: ip6.forwarding */ return ((getinet6sysctl(IPV6CTL_FORWARDING) == 0) && (getinet6sysctl(IPV6CTL_ACCEPT_RTADV) == 1)); #else /* * RA_RECV: ND6_IFF_ACCEPT_RTADV * RA_SEND: ip6.forwarding */ if (update_ifinfo_nd_flags(ifi) != 0) { syslog(LOG_ERR, "cannot get nd6 flags (idx=%d)", idx); return (0); } return (ifi->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV); #endif } static void ra_input(int len, struct nd_router_advert *nra, struct in6_pktinfo *pi, struct sockaddr_in6 *from) { struct rainfo *rai; struct ifinfo *ifi; char ntopbuf[INET6_ADDRSTRLEN]; char ifnamebuf[IFNAMSIZ]; union nd_opt ndopts; const char *on_off[] = {"OFF", "ON"}; uint32_t reachabletime, retranstimer, mtu; int inconsistent = 0; int error; syslog(LOG_DEBUG, "<%s> RA received from %s on %s", __func__, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); /* ND option check */ memset(&ndopts, 0, sizeof(ndopts)); TAILQ_INIT(&ndopts.opt_list); error = nd6_options((struct nd_opt_hdr *)(nra + 1), len - sizeof(struct nd_router_advert), &ndopts, NDOPT_FLAG_SRCLINKADDR | NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU | NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL); if (error) { syslog(LOG_INFO, "<%s> ND option check failed for an RA from %s on %s", __func__, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); return; } /* * RA consistency check according to RFC 4861 6.2.7 */ ifi = if_indextoifinfo(pi->ipi6_ifindex); if (ifi->ifi_rainfo == NULL) { syslog(LOG_INFO, "<%s> received RA from %s on non-advertising" " interface(%s)", __func__, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, ifnamebuf)); goto done; } rai = ifi->ifi_rainfo; ifi->ifi_rainput++; syslog(LOG_DEBUG, "<%s> ifi->ifi_rainput = %" PRIu64, __func__, ifi->ifi_rainput); /* Cur Hop Limit value */ if (nra->nd_ra_curhoplimit && rai->rai_hoplimit && nra->nd_ra_curhoplimit != rai->rai_hoplimit) { syslog(LOG_NOTICE, "CurHopLimit inconsistent on %s:" " %d from %s, %d from us", ifi->ifi_ifname, nra->nd_ra_curhoplimit, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), rai->rai_hoplimit); inconsistent++; } /* M flag */ if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) != rai->rai_managedflg) { syslog(LOG_NOTICE, "M flag inconsistent on %s:" " %s from %s, %s from us", ifi->ifi_ifname, on_off[!rai->rai_managedflg], inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), on_off[rai->rai_managedflg]); inconsistent++; } /* O flag */ if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) != rai->rai_otherflg) { syslog(LOG_NOTICE, "O flag inconsistent on %s:" " %s from %s, %s from us", ifi->ifi_ifname, on_off[!rai->rai_otherflg], inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), on_off[rai->rai_otherflg]); inconsistent++; } #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG - /* 6 flag */ + /* S "IPv6-Only" (Six, Silence-IPv4) flag */ if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_IPV6_ONLY) != rai->rai_ipv6onlyflg) { syslog(LOG_NOTICE, - "6 flag inconsistent on %s:" + "S flag inconsistent on %s:" " %s from %s, %s from us", ifi->ifi_ifname, on_off[!rai->rai_ipv6onlyflg], inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), on_off[rai->rai_ipv6onlyflg]); inconsistent++; } #endif /* Reachable Time */ reachabletime = ntohl(nra->nd_ra_reachable); if (reachabletime && rai->rai_reachabletime && reachabletime != rai->rai_reachabletime) { syslog(LOG_NOTICE, "ReachableTime inconsistent on %s:" " %d from %s, %d from us", ifi->ifi_ifname, reachabletime, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), rai->rai_reachabletime); inconsistent++; } /* Retrans Timer */ retranstimer = ntohl(nra->nd_ra_retransmit); if (retranstimer && rai->rai_retranstimer && retranstimer != rai->rai_retranstimer) { syslog(LOG_NOTICE, "RetranceTimer inconsistent on %s:" " %d from %s, %d from us", ifi->ifi_ifname, retranstimer, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), rai->rai_retranstimer); inconsistent++; } /* Values in the MTU options */ if (ndopts.opt_mtu) { mtu = ntohl(ndopts.opt_mtu->nd_opt_mtu_mtu); if (mtu && rai->rai_linkmtu && mtu != rai->rai_linkmtu) { syslog(LOG_NOTICE, "MTU option value inconsistent on %s:" " %d from %s, %d from us", ifi->ifi_ifname, mtu, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), rai->rai_linkmtu); inconsistent++; } } /* Preferred and Valid Lifetimes for prefixes */ { struct nd_optlist *nol; if (ndopts.opt_pi) if (prefix_check(ndopts.opt_pi, rai, from)) inconsistent++; TAILQ_FOREACH(nol, &ndopts.opt_list, nol_next) if (prefix_check((struct nd_opt_prefix_info *)nol->nol_opt, rai, from)) inconsistent++; } if (inconsistent) ifi->ifi_rainconsistent++; done: free_ndopts(&ndopts); return; } static uint32_t udiff(uint32_t u, uint32_t v) { return (u >= v ? u - v : v - u); } /* return a non-zero value if the received prefix is inconsistent with ours */ static int prefix_check(struct nd_opt_prefix_info *pinfo, struct rainfo *rai, struct sockaddr_in6 *from) { struct ifinfo *ifi; uint32_t preferred_time, valid_time; struct prefix *pfx; int inconsistent = 0; char ntopbuf[INET6_ADDRSTRLEN]; char prefixbuf[INET6_ADDRSTRLEN]; struct timespec now; #if 0 /* impossible */ if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION) return (0); #endif ifi = rai->rai_ifinfo; /* * log if the adveritsed prefix has link-local scope(sanity check?) */ if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) syslog(LOG_INFO, "<%s> link-local prefix %s/%d is advertised " "from %s on %s", __func__, inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, sizeof(prefixbuf)), pinfo->nd_opt_pi_prefix_len, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), ifi->ifi_ifname); if ((pfx = find_prefix(rai, &pinfo->nd_opt_pi_prefix, pinfo->nd_opt_pi_prefix_len)) == NULL) { syslog(LOG_INFO, "<%s> prefix %s/%d from %s on %s is not in our list", __func__, inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, sizeof(prefixbuf)), pinfo->nd_opt_pi_prefix_len, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), ifi->ifi_ifname); return (0); } preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time); if (pfx->pfx_pltimeexpire) { /* * The lifetime is decremented in real time, so we should * compare the expiration time. * (RFC 2461 Section 6.2.7.) * XXX: can we really expect that all routers on the link * have synchronized clocks? */ clock_gettime(CLOCK_MONOTONIC_FAST, &now); preferred_time += now.tv_sec; if (!pfx->pfx_timer && rai->rai_clockskew && udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) { syslog(LOG_INFO, "<%s> preferred lifetime for %s/%d" " (decr. in real time) inconsistent on %s:" " %" PRIu32 " from %s, %" PRIu32 " from us", __func__, inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, sizeof(prefixbuf)), pinfo->nd_opt_pi_prefix_len, ifi->ifi_ifname, preferred_time, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), pfx->pfx_pltimeexpire); inconsistent++; } } else if (!pfx->pfx_timer && preferred_time != pfx->pfx_preflifetime) syslog(LOG_INFO, "<%s> preferred lifetime for %s/%d" " inconsistent on %s:" " %d from %s, %d from us", __func__, inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, sizeof(prefixbuf)), pinfo->nd_opt_pi_prefix_len, ifi->ifi_ifname, preferred_time, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), pfx->pfx_preflifetime); valid_time = ntohl(pinfo->nd_opt_pi_valid_time); if (pfx->pfx_vltimeexpire) { clock_gettime(CLOCK_MONOTONIC_FAST, &now); valid_time += now.tv_sec; if (!pfx->pfx_timer && rai->rai_clockskew && udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) { syslog(LOG_INFO, "<%s> valid lifetime for %s/%d" " (decr. in real time) inconsistent on %s:" " %d from %s, %" PRIu32 " from us", __func__, inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, sizeof(prefixbuf)), pinfo->nd_opt_pi_prefix_len, ifi->ifi_ifname, preferred_time, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), pfx->pfx_vltimeexpire); inconsistent++; } } else if (!pfx->pfx_timer && valid_time != pfx->pfx_validlifetime) { syslog(LOG_INFO, "<%s> valid lifetime for %s/%d" " inconsistent on %s:" " %d from %s, %d from us", __func__, inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, sizeof(prefixbuf)), pinfo->nd_opt_pi_prefix_len, ifi->ifi_ifname, valid_time, inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), pfx->pfx_validlifetime); inconsistent++; } return (inconsistent); } struct prefix * find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen) { struct prefix *pfx; int bytelen, bitlen; char bitmask; TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) { if (plen != pfx->pfx_prefixlen) continue; bytelen = plen / 8; bitlen = plen % 8; bitmask = 0xff << (8 - bitlen); if (memcmp((void *)prefix, (void *)&pfx->pfx_prefix, bytelen)) continue; if (bitlen == 0 || ((prefix->s6_addr[bytelen] & bitmask) == (pfx->pfx_prefix.s6_addr[bytelen] & bitmask))) { return (pfx); } } return (NULL); } /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */ int prefix_match(struct in6_addr *p0, int plen0, struct in6_addr *p1, int plen1) { int bytelen, bitlen; char bitmask; if (plen0 < plen1) return (0); bytelen = plen1 / 8; bitlen = plen1 % 8; bitmask = 0xff << (8 - bitlen); if (memcmp((void *)p0, (void *)p1, bytelen)) return (0); if (bitlen == 0 || ((p0->s6_addr[bytelen] & bitmask) == (p1->s6_addr[bytelen] & bitmask))) { return (1); } return (0); } static int nd6_options(struct nd_opt_hdr *hdr, int limit, union nd_opt *ndopts, uint32_t optflags) { int optlen = 0; for (; limit > 0; limit -= optlen) { if ((size_t)limit < sizeof(struct nd_opt_hdr)) { syslog(LOG_INFO, "<%s> short option header", __func__); goto bad; } hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen); if (hdr->nd_opt_len == 0) { syslog(LOG_INFO, "<%s> bad ND option length(0) (type = %d)", __func__, hdr->nd_opt_type); goto bad; } optlen = hdr->nd_opt_len << 3; if (optlen > limit) { syslog(LOG_INFO, "<%s> short option", __func__); goto bad; } if (hdr->nd_opt_type > ND_OPT_MTU && hdr->nd_opt_type != ND_OPT_RDNSS && hdr->nd_opt_type != ND_OPT_DNSSL) { syslog(LOG_INFO, "<%s> unknown ND option(type %d)", __func__, hdr->nd_opt_type); continue; } if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) { syslog(LOG_INFO, "<%s> unexpected ND option(type %d)", __func__, hdr->nd_opt_type); continue; } /* * Option length check. Do it here for all fixed-length * options. */ switch (hdr->nd_opt_type) { case ND_OPT_MTU: if (optlen == sizeof(struct nd_opt_mtu)) break; goto skip; case ND_OPT_RDNSS: if (optlen >= 24 && (optlen - sizeof(struct nd_opt_rdnss)) % 16 == 0) break; goto skip; case ND_OPT_DNSSL: if (optlen >= 16 && (optlen - sizeof(struct nd_opt_dnssl)) % 8 == 0) break; goto skip; case ND_OPT_PREFIX_INFORMATION: if (optlen == sizeof(struct nd_opt_prefix_info)) break; skip: syslog(LOG_INFO, "<%s> invalid option length", __func__); continue; } switch (hdr->nd_opt_type) { case ND_OPT_TARGET_LINKADDR: case ND_OPT_REDIRECTED_HEADER: case ND_OPT_RDNSS: case ND_OPT_DNSSL: break; /* we don't care about these options */ case ND_OPT_SOURCE_LINKADDR: case ND_OPT_MTU: if (ndopts->opt_array[hdr->nd_opt_type]) { syslog(LOG_INFO, "<%s> duplicated ND option (type = %d)", __func__, hdr->nd_opt_type); } ndopts->opt_array[hdr->nd_opt_type] = hdr; break; case ND_OPT_PREFIX_INFORMATION: { struct nd_optlist *nol; if (ndopts->opt_pi == 0) { ndopts->opt_pi = (struct nd_opt_prefix_info *)hdr; continue; } nol = malloc(sizeof(*nol)); if (nol == NULL) { syslog(LOG_ERR, "<%s> can't allocate memory", __func__); goto bad; } nol->nol_opt = hdr; TAILQ_INSERT_TAIL(&(ndopts->opt_list), nol, nol_next); break; } default: /* impossible */ break; } } return (0); bad: free_ndopts(ndopts); return (-1); } static void free_ndopts(union nd_opt *ndopts) { struct nd_optlist *nol; while ((nol = TAILQ_FIRST(&ndopts->opt_list)) != NULL) { TAILQ_REMOVE(&ndopts->opt_list, nol, nol_next); free(nol); } } void sock_open(struct sockinfo *s) { struct icmp6_filter filt; int on; /* XXX: should be max MTU attached to the node */ static char answer[1500]; syslog(LOG_DEBUG, "<%s> enter", __func__); if (s == NULL) { syslog(LOG_ERR, "<%s> internal error", __func__); exit(1); } rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)); rcvcmsgbuf = (char *)malloc(rcvcmsgbuflen); if (rcvcmsgbuf == NULL) { syslog(LOG_ERR, "<%s> not enough core", __func__); exit(1); } sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)); sndcmsgbuf = (char *)malloc(sndcmsgbuflen); if (sndcmsgbuf == NULL) { syslog(LOG_ERR, "<%s> not enough core", __func__); exit(1); } if ((s->si_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno)); exit(1); } /* specify to tell receiving interface */ on = 1; if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on)) < 0) { syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s", __func__, strerror(errno)); exit(1); } on = 1; /* specify to tell value of hoplimit field of received IP6 hdr */ if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, sizeof(on)) < 0) { syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s", __func__, strerror(errno)); exit(1); } ICMP6_FILTER_SETBLOCKALL(&filt); ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt); ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt); if (mcastif != NULL) ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt); if (setsockopt(s->si_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt)) < 0) { syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s", __func__, strerror(errno)); exit(1); } /* initialize msghdr for receiving packets */ rcviov[0].iov_base = (caddr_t)answer; rcviov[0].iov_len = sizeof(answer); rcvmhdr.msg_name = (caddr_t)&rcvfrom; rcvmhdr.msg_namelen = sizeof(rcvfrom); rcvmhdr.msg_iov = rcviov; rcvmhdr.msg_iovlen = 1; rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; rcvmhdr.msg_controllen = rcvcmsgbuflen; /* initialize msghdr for sending packets */ sndmhdr.msg_namelen = sizeof(struct sockaddr_in6); sndmhdr.msg_iov = sndiov; sndmhdr.msg_iovlen = 1; sndmhdr.msg_control = (caddr_t)sndcmsgbuf; sndmhdr.msg_controllen = sndcmsgbuflen; return; } /* open a routing socket to watch the routing table */ static void rtsock_open(struct sockinfo *s) { if (s == NULL) { syslog(LOG_ERR, "<%s> internal error", __func__); exit(1); } if ((s->si_fd = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno)); exit(1); } } struct ifinfo * if_indextoifinfo(int idx) { struct ifinfo *ifi; char *name, name0[IFNAMSIZ]; /* Check if the interface has a valid name or not. */ if (if_indextoname(idx, name0) == NULL) return (NULL); TAILQ_FOREACH(ifi, &ifilist, ifi_next) { if (ifi->ifi_ifindex == idx) return (ifi); } if (ifi != NULL) syslog(LOG_DEBUG, "<%s> ifi found (idx=%d)", __func__, idx); else syslog(LOG_DEBUG, "<%s> ifi not found (idx=%d)", __func__, idx); return (NULL); /* search failed */ } void ra_output(struct ifinfo *ifi) { int i; struct cmsghdr *cm; struct in6_pktinfo *pi; struct soliciter *sol; struct rainfo *rai; switch (ifi->ifi_state) { case IFI_STATE_CONFIGURED: rai = ifi->ifi_rainfo; break; case IFI_STATE_TRANSITIVE: rai = ifi->ifi_rainfo_trans; break; case IFI_STATE_UNCONFIGURED: syslog(LOG_DEBUG, "<%s> %s is unconfigured. " "Skip sending RAs.", __func__, ifi->ifi_ifname); return; default: rai = NULL; } if (rai == NULL) { syslog(LOG_DEBUG, "<%s> rainfo is NULL on %s." "Skip sending RAs.", __func__, ifi->ifi_ifname); return; } if (!(ifi->ifi_flags & IFF_UP)) { syslog(LOG_DEBUG, "<%s> %s is not up. " "Skip sending RAs.", __func__, ifi->ifi_ifname); return; } /* * Check lifetime, ACCEPT_RTADV flag, and ip6.forwarding. * * (lifetime == 0) = output * (lifetime != 0 && (check_accept_rtadv()) = no output * * Basically, hosts MUST NOT send Router Advertisement * messages at any time (RFC 4861, Section 6.2.3). However, it * would sometimes be useful to allow hosts to advertise some * parameters such as prefix information and link MTU. Thus, * we allow hosts to invoke rtadvd only when router lifetime * (on every advertising interface) is explicitly set * zero. (see also the above section) */ syslog(LOG_DEBUG, "<%s> check lifetime=%d, ACCEPT_RTADV=%d, ip6.forwarding=%d " "on %s", __func__, rai->rai_lifetime, check_accept_rtadv(ifi->ifi_ifindex), getinet6sysctl(IPV6CTL_FORWARDING), ifi->ifi_ifname); if (rai->rai_lifetime != 0) { if (getinet6sysctl(IPV6CTL_FORWARDING) == 0) { syslog(LOG_ERR, "non-zero lifetime RA " "but net.inet6.ip6.forwarding=0. " "Ignored."); return; } if (check_accept_rtadv(ifi->ifi_ifindex)) { syslog(LOG_ERR, "non-zero lifetime RA " "on RA receiving interface %s." " Ignored.", ifi->ifi_ifname); return; } } make_packet(rai); /* XXX: inefficient */ sndmhdr.msg_name = (caddr_t)&sin6_linklocal_allnodes; sndmhdr.msg_iov[0].iov_base = (caddr_t)rai->rai_ra_data; sndmhdr.msg_iov[0].iov_len = rai->rai_ra_datalen; cm = CMSG_FIRSTHDR(&sndmhdr); /* specify the outgoing interface */ cm->cmsg_level = IPPROTO_IPV6; cm->cmsg_type = IPV6_PKTINFO; cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); pi = (struct in6_pktinfo *)CMSG_DATA(cm); memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/ pi->ipi6_ifindex = ifi->ifi_ifindex; /* specify the hop limit of the packet */ { int hoplimit = 255; cm = CMSG_NXTHDR(&sndmhdr, cm); cm->cmsg_level = IPPROTO_IPV6; cm->cmsg_type = IPV6_HOPLIMIT; cm->cmsg_len = CMSG_LEN(sizeof(int)); memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int)); } syslog(LOG_DEBUG, "<%s> send RA on %s, # of RS waitings = %d", __func__, ifi->ifi_ifname, ifi->ifi_rs_waitcount); i = sendmsg(sock.si_fd, &sndmhdr, 0); if (i < 0 || (size_t)i != rai->rai_ra_datalen) { if (i < 0) { syslog(LOG_ERR, "<%s> sendmsg on %s: %s", __func__, ifi->ifi_ifname, strerror(errno)); } } /* * unicast advertisements * XXX commented out. reason: though spec does not forbit it, unicast * advert does not really help */ while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) { TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next); free(sol); } /* update timestamp */ clock_gettime(CLOCK_MONOTONIC_FAST, &ifi->ifi_ra_lastsent); /* update counter */ ifi->ifi_rs_waitcount = 0; ifi->ifi_raoutput++; switch (ifi->ifi_state) { case IFI_STATE_CONFIGURED: if (ifi->ifi_burstcount > 0) ifi->ifi_burstcount--; break; case IFI_STATE_TRANSITIVE: ifi->ifi_burstcount--; if (ifi->ifi_burstcount == 0) { if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { /* Initial burst finished. */ if (ifi->ifi_rainfo_trans != NULL) ifi->ifi_rainfo_trans = NULL; } /* Remove burst RA information */ if (ifi->ifi_rainfo_trans != NULL) { rm_rainfo(ifi->ifi_rainfo_trans); ifi->ifi_rainfo_trans = NULL; } if (ifi->ifi_rainfo != NULL) { /* * TRANSITIVE -> CONFIGURED * * After initial burst or transition from * one configuration to another, * ifi_rainfo always points to the next RA * information. */ ifi->ifi_state = IFI_STATE_CONFIGURED; syslog(LOG_DEBUG, "<%s> ifname=%s marked as " "CONFIGURED.", __func__, ifi->ifi_ifname); } else { /* * TRANSITIVE -> UNCONFIGURED * * If ifi_rainfo points to NULL, this * interface is shutting down. * */ int error; ifi->ifi_state = IFI_STATE_UNCONFIGURED; syslog(LOG_DEBUG, "<%s> ifname=%s marked as " "UNCONFIGURED.", __func__, ifi->ifi_ifname); error = sock_mc_leave(&sock, ifi->ifi_ifindex); if (error) exit(1); } } break; } } /* process RA timer */ struct rtadvd_timer * ra_timeout(void *arg) { struct ifinfo *ifi; ifi = (struct ifinfo *)arg; syslog(LOG_DEBUG, "<%s> RA timer on %s is expired", __func__, ifi->ifi_ifname); ra_output(ifi); return (ifi->ifi_ra_timer); } /* update RA timer */ void ra_timer_update(void *arg, struct timespec *tm) { uint16_t interval; struct rainfo *rai; struct ifinfo *ifi; ifi = (struct ifinfo *)arg; rai = ifi->ifi_rainfo; interval = 0; switch (ifi->ifi_state) { case IFI_STATE_UNCONFIGURED: return; break; case IFI_STATE_CONFIGURED: /* * Whenever a multicast advertisement is sent from * an interface, the timer is reset to a * uniformly-distributed random value between the * interface's configured MinRtrAdvInterval and * MaxRtrAdvInterval (RFC4861 6.2.4). */ interval = rai->rai_mininterval; interval += arc4random_uniform(rai->rai_maxinterval - rai->rai_mininterval); break; case IFI_STATE_TRANSITIVE: /* * For the first few advertisements (up to * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen * interval is greater than * MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer SHOULD be * set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead. (RFC * 4861 6.2.4) * * In such cases, the router SHOULD transmit one or more * (but not more than MAX_FINAL_RTR_ADVERTISEMENTS) final * multicast Router Advertisements on the interface with a * Router Lifetime field of zero. (RFC 4861 6.2.5) */ interval = ifi->ifi_burstinterval; break; } tm->tv_sec = interval; tm->tv_nsec = 0; syslog(LOG_DEBUG, "<%s> RA timer on %s is set to %ld:%ld", __func__, ifi->ifi_ifname, (long int)tm->tv_sec, (long int)tm->tv_nsec / 1000); return; }