/* $OpenBSD: config.c,v 1.58 2016/08/02 17:00:09 jca Exp $ */ /* $KAME: config.c,v 1.62 2002/05/29 10:13:10 itojun Exp $ */ /* * Copyright (C) 1998 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. */ #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 "if.h" #include "config.h" #include "log.h" static void makeentry(char *, size_t, int, char *); static int getinet6sysctl(int); extern struct ralist ralist; void getconfig(char *intface) { int stat, i; char tbuf[BUFSIZ]; struct rainfo *tmp; long val; int64_t val64; char buf[BUFSIZ]; char *bp = buf; char *addr; static int forwarding = -1; #define MUSTHAVE(var, cap) \ do { \ int64_t t; \ if ((t = agetnum(cap)) < 0) { \ log_warnx("need %s for interface %s", \ cap, intface); \ exit(1); \ } \ var = t; \ } while (0) #define MAYHAVE(var, cap, def) \ do { \ if ((var = agetnum(cap)) < 0) \ var = def; \ } while (0) if ((stat = agetent(tbuf, intface)) <= 0) { memset(tbuf, 0, sizeof(tbuf)); log_info("Could not parse configuration file for %s" " or the configuration file doesn't exist." " Treat it as default", intface); } if ((tmp = calloc(1, sizeof(*tmp))) == NULL) fatal(NULL); TAILQ_INIT(&tmp->prefixes); TAILQ_INIT(&tmp->rtinfos); TAILQ_INIT(&tmp->rdnsss); TAILQ_INIT(&tmp->dnssls); /* check if we are allowed to forward packets (if not determined) */ if (forwarding < 0) { if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0) exit(1); } /* make sure that the user-specified interface name fits */ if (strlcpy(tmp->ifname, intface, sizeof(tmp->ifname)) >= sizeof(tmp->ifname)) fatalx("invalid interface name"); /* get interface information */ if (agetflag("nolladdr")) tmp->advlinkopt = 0; else tmp->advlinkopt = 1; if (tmp->advlinkopt) { if ((tmp->sdl = if_nametosdl(intface)) == NULL) { log_warnx("can't get information of %s", intface); exit(1); } tmp->ifindex = tmp->sdl->sdl_index; } else tmp->ifindex = if_nametoindex(intface); if ((tmp->phymtu = if_getmtu(intface)) == 0) { tmp->phymtu = IPV6_MMTU; log_warn("can't get interface mtu of %s. Treat as %d", intface, IPV6_MMTU); } /* * set router configuration variables. */ MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL); if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) { log_warnx("maxinterval (%ld) on %s is invalid " "(must be between %e and %u)", val, intface, MIN_MAXINTERVAL, MAX_MAXINTERVAL); exit(1); } tmp->maxinterval = (u_int)val; MAYHAVE(val, "mininterval", tmp->maxinterval/3); if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) { log_warnx("mininterval (%ld) on %s is invalid " "(must be between %e and %d)", val, intface, MIN_MININTERVAL, (tmp->maxinterval * 3) / 4); exit(1); } tmp->mininterval = (u_int)val; MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT); tmp->hoplimit = val & 0xff; MAYHAVE(val, "raflags", 0); tmp->managedflg = val & ND_RA_FLAG_MANAGED; tmp->otherflg = val & ND_RA_FLAG_OTHER; tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK; if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) { log_warnx("invalid router preference (%02x) on %s", tmp->rtpref, intface); exit(1); } MAYHAVE(val, "rltime", tmp->maxinterval * 3); if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) { log_warnx("router lifetime (%ld) on %s is invalid " "(must be 0 or between %d and %d)", val, intface, tmp->maxinterval, MAXROUTERLIFETIME); exit(1); } /* * Basically, hosts MUST NOT send Router Advertisement messages at any * time (RFC 2461, 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 * explicitely set to zero. (see also the above section) */ if (val && forwarding == 0) { log_warnx("non zero router lifetime is specified for %s, " "which must not be allowed for hosts. you must " "change router lifetime or enable IPv6 forwarding.", intface); exit(1); } tmp->lifetime = val & 0xffff; MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME); if (val < 0 || val > MAXREACHABLETIME) { log_warnx("reachable time (%ld) on %s is invalid" " (must be no greater than %d)", val, intface, MAXREACHABLETIME); exit(1); } tmp->reachabletime = (u_int32_t)val; MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER); if (val64 < 0 || val64 > 0xffffffff) { log_warnx("retrans time (%lld) on %s out of range", (long long)val64, intface); exit(1); } tmp->retranstimer = (u_int32_t)val64; if (agetnum("hapref") != -1 || agetnum("hatime") != -1) { log_warnx("mobile-ip6 configuration not supported"); exit(1); } /* 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); tmp->clockskew = val; tmp->pfxs = 0; for (i = -1; i < MAXPREFIX; i++) { struct prefix *pfx; char entbuf[256]; makeentry(entbuf, sizeof(entbuf), i, "addr"); addr = agetstr(entbuf, &bp); if (addr == NULL) continue; /* allocate memory to store prefix information */ if ((pfx = calloc(1, sizeof(*pfx))) == NULL) fatal(NULL); /* link into chain */ TAILQ_INSERT_TAIL(&tmp->prefixes, pfx, entry); tmp->pfxs++; pfx->origin = PREFIX_FROM_CONFIG; if (inet_pton(AF_INET6, addr, &pfx->prefix) != 1) { log_warn("inet_pton failed for %s", addr); exit(1); } if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) { log_warnx("multicast prefix (%s) must" " not be advertised on %s", addr, intface); exit(1); } if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix)) log_info("link-local prefix (%s) will be" " advertised on %s", addr, intface); makeentry(entbuf, sizeof(entbuf), i, "prefixlen"); MAYHAVE(val, entbuf, 64); if (val < 0 || val > 128) { log_warnx("prefixlen (%ld) for %s " "on %s out of range", val, addr, intface); exit(1); } pfx->prefixlen = (int)val; makeentry(entbuf, sizeof(entbuf), i, "pinfoflags"); MAYHAVE(val, entbuf, (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO)); pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK; pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO; makeentry(entbuf, sizeof(entbuf), i, "vltime"); MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); if (val64 < 0 || val64 > 0xffffffff) { log_warnx("vltime (%lld) for" " %s/%d on %s is out of range", (long long)val64, addr, pfx->prefixlen, intface); exit(1); } pfx->validlifetime = (u_int32_t)val64; makeentry(entbuf, sizeof(entbuf), i, "vltimedecr"); if (agetflag(entbuf)) { struct timeval now; gettimeofday(&now, 0); pfx->vltimeexpire = now.tv_sec + pfx->validlifetime; } makeentry(entbuf, sizeof(entbuf), i, "pltime"); MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME); if (val64 < 0 || val64 > 0xffffffff) { log_warnx("pltime (%lld) for %s/%d on %s" " is out of range", (long long)val64, addr, pfx->prefixlen, intface); exit(1); } pfx->preflifetime = (u_int32_t)val64; makeentry(entbuf, sizeof(entbuf), i, "pltimedecr"); if (agetflag(entbuf)) { struct timeval now; gettimeofday(&now, 0); pfx->pltimeexpire = now.tv_sec + pfx->preflifetime; } } if (tmp->pfxs == 0 && !agetflag("noifprefix")) get_prefix(tmp); for (i = -1; i < MAXRTINFO; i++) { struct rtinfo *rti; char entbuf[256]; const char *flagstr; makeentry(entbuf, sizeof(entbuf), i, "rtprefix"); addr = agetstr(entbuf, &bp); if (addr == NULL) continue; rti = malloc(sizeof(struct rtinfo)); if (rti == NULL) fatal(NULL); if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) { log_warn("inet_pton failed for %s", addr); exit(1); } makeentry(entbuf, sizeof(entbuf), i, "rtplen"); MAYHAVE(val, entbuf, 64); if (val < 0 || val > 128) { log_warnx("route prefixlen (%ld) for %s " "on %s out of range", val, addr, intface); exit(1); } rti->prefixlen = (int)val; makeentry(entbuf, sizeof(entbuf), i, "rtflags"); if ((flagstr = 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) { log_warnx("the \'h\' and \'l\'" " route preferences are" " exclusive"); exit(1); } val |= ND_RA_FLAG_RTPREF_LOW; } } else MAYHAVE(val, entbuf, 0); rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK; if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) { log_warnx("invalid route preference (%02x)" " for %s/%d on %s", rti->rtpref, addr, rti->prefixlen, intface); exit(1); } makeentry(entbuf, sizeof(entbuf), i, "rtltime"); MAYHAVE(val64, entbuf, -1); if (val64 == -1) val64 = tmp->lifetime; if (val64 < 0 || val64 >= 0xffffffff) { log_warnx("route lifetime (%d) " " for %s/%d on %s out of range", rti->rtpref, addr, rti->prefixlen, intface); exit(1); } rti->lifetime = (uint32_t)val64; TAILQ_INSERT_TAIL(&tmp->rtinfos, rti, entry); } for (i = -1; i < MAXRDNSS; ++i) { struct rdnss *rds; char entbuf[256]; char *tmpaddr; makeentry(entbuf, sizeof(entbuf), i, "rdnss"); addr = agetstr(entbuf, &bp); if (addr == NULL) continue; /* servers are separated by commas in the config file */ val = 1; tmpaddr = addr; while (*tmpaddr++) if (*tmpaddr == ',') ++val; rds = malloc(sizeof(struct rdnss) + val * sizeof(struct in6_addr)); if (rds == NULL) fatal(NULL); TAILQ_INSERT_TAIL(&tmp->rdnsss, rds, entry); rds->servercnt = val; makeentry(entbuf, sizeof(entbuf), i, "rdnssltime"); MAYHAVE(val, entbuf, (tmp->maxinterval * 3) / 2); if (val < tmp->maxinterval || val > tmp->maxinterval * 2) { log_warnx("%s (%ld) on %s is invalid " "(should be between %d and %d)", entbuf, val, intface, tmp->maxinterval, tmp->maxinterval * 2); } rds->lifetime = val; val = 0; while ((tmpaddr = strsep(&addr, ","))) { if (inet_pton(AF_INET6, tmpaddr, &rds->servers[val]) != 1) { log_warn("inet_pton failed for %s", tmpaddr); exit(1); } val++; } } for (i = -1; i < MAXDNSSL; ++i) { struct dnssl *dsl; char entbuf[256]; char *tmpsl; makeentry(entbuf, sizeof(entbuf), i, "dnssl"); addr = agetstr(entbuf, &bp); if (addr == NULL) continue; dsl = malloc(sizeof(struct dnssl)); if (dsl == NULL) fatal(NULL); TAILQ_INIT(&dsl->dnssldoms); while ((tmpsl = strsep(&addr, ","))) { struct dnssldom *dnsd; size_t len; len = strlen(tmpsl); /* if the domain is not "dot-terminated", add it */ if (tmpsl[len - 1] != '.') len += 1; dnsd = malloc(sizeof(struct dnssldom) + len + 1); if (dnsd == NULL) fatal(NULL); dnsd->length = len; strlcpy(dnsd->domain, tmpsl, len + 1); dnsd->domain[len - 1] = '.'; dnsd->domain[len] = '\0'; TAILQ_INSERT_TAIL(&dsl->dnssldoms, dnsd, entry); } TAILQ_INSERT_TAIL(&tmp->dnssls, dsl, entry); makeentry(entbuf, sizeof(entbuf), i, "dnsslltime"); MAYHAVE(val, entbuf, (tmp->maxinterval * 3) / 2); if (val < tmp->maxinterval || val > tmp->maxinterval * 2) { log_warnx("%s (%ld) on %s is invalid " "(should be between %d and %d)", entbuf, val, intface, tmp->maxinterval, tmp->maxinterval * 2); } dsl->lifetime = val; } MAYHAVE(val, "mtu", 0); if (val < 0 || val > 0xffffffff) { log_warnx("mtu (%ld) on %s out of range", val, intface); exit(1); } tmp->linkmtu = (u_int32_t)val; if (tmp->linkmtu == 0) { char *mtustr; if ((mtustr = agetstr("mtu", &bp)) && strcmp(mtustr, "auto") == 0) tmp->linkmtu = tmp->phymtu; } else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) { log_warnx("advertised link mtu (%u) on %s is invalid (must" " be between least MTU (%d) and physical link MTU (%d)", tmp->linkmtu, intface, IPV6_MMTU, tmp->phymtu); exit(1); } /* route information */ MAYHAVE(val, "routes", -1); if (val != -1) log_info("route information option is not available"); /* okey */ SLIST_INSERT_HEAD(&ralist, tmp, entry); /* construct the sending packet */ make_packet(tmp); /* set timer */ ra_timer_update(tmp); } void get_prefix(struct rainfo *rai) { struct ifaddrs *ifap, *ifa; struct prefix *pp; struct in6_addr *a; u_char *p, *ep, *m, *lim; u_char ntopbuf[INET6_ADDRSTRLEN]; if (getifaddrs(&ifap) < 0) fatal("can't get interface addresses"); for (ifa = ifap; ifa; ifa = ifa->ifa_next) { int plen; if (strcmp(ifa->ifa_name, rai->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 = (u_char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; lim = (u_char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len; plen = prefixlen(m, lim); if (plen <= 0 || plen > 128) fatalx("failed to get prefixlen or prefix is invalid"); if (plen == 128) /* XXX */ continue; if (find_prefix(rai, a, plen)) { /* ignore a duplicated prefix. */ continue; } /* allocate memory to store prefix info. */ if ((pp = calloc(1, sizeof(*pp))) == NULL) fatal(NULL); /* set prefix, sweep bits outside of prefixlen */ pp->prefixlen = plen; memcpy(&pp->prefix, a, sizeof(*a)); if (1) { p = (u_char *)&pp->prefix; ep = (u_char *)(&pp->prefix + 1); while (m < lim && p < ep) *p++ &= *m++; while (p < ep) *p++ = 0x00; } if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf, sizeof(ntopbuf))) fatal("inet_ntop failed"); log_debug("add %s/%d to prefix list on %s", ntopbuf, pp->prefixlen, rai->ifname); /* set other fields with protocol defaults */ pp->validlifetime = DEF_ADVVALIDLIFETIME; pp->preflifetime = DEF_ADVPREFERREDLIFETIME; pp->onlinkflg = 1; pp->autoconfflg = 1; pp->origin = PREFIX_FROM_KERNEL; /* link into chain */ TAILQ_INSERT_TAIL(&rai->prefixes, pp, entry); /* counter increment */ rai->pfxs++; } freeifaddrs(ifap); } static void makeentry(char *buf, size_t len, int id, 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) ought * to be specified. */ void make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen) { struct prefix *prefix; u_char ntopbuf[INET6_ADDRSTRLEN]; if ((prefix = calloc(1, sizeof(*prefix))) == NULL) { log_warn(NULL); return; /* XXX: error or exit? */ } prefix->prefix = *addr; prefix->prefixlen = plen; prefix->validlifetime = DEF_ADVVALIDLIFETIME; prefix->preflifetime = DEF_ADVPREFERREDLIFETIME; prefix->onlinkflg = 1; prefix->autoconfflg = 1; prefix->origin = PREFIX_FROM_DYNAMIC; TAILQ_INSERT_TAIL(&rai->prefixes, prefix, entry); log_debug("new prefix %s/%d was added on %s", inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname); /* free the previous packet */ free(rai->ra_data); rai->ra_data = NULL; /* reconstruct the packet */ rai->pfxs++; make_packet(rai); /* * reset the timer so that the new prefix will be advertised quickly. */ rai->initcounter = 0; ra_timer_update(rai); } /* * 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 rainfo *rai, struct prefix *prefix) { u_char ntopbuf[INET6_ADDRSTRLEN]; TAILQ_REMOVE(&rai->prefixes, prefix, entry); log_debug("prefix %s/%d was deleted on %s", inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname); free(prefix); rai->pfxs--; make_packet(rai); } void make_packet(struct rainfo *rainfo) { 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 nd_opt_rdnss *ndopt_rdnss; struct nd_opt_dnssl *ndopt_dnssl; struct prefix *pfx; struct rtinfo *rti; struct rdnss *rds; struct dnssl *dsl; struct dnssldom *dnsd; /* calculate total length */ packlen = sizeof(struct nd_router_advert); if (rainfo->advlinkopt) { if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) { log_info("link-layer address option has" " null length on %s. Treat as not included.", rainfo->ifname); rainfo->advlinkopt = 0; } packlen += lladdroptlen; } if (rainfo->pfxs) packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs; if (rainfo->linkmtu) packlen += sizeof(struct nd_opt_mtu); TAILQ_FOREACH(rti, &rainfo->rtinfos, entry) packlen += sizeof(struct nd_opt_route_info) + ((rti->prefixlen + 0x3f) >> 6) * 8; TAILQ_FOREACH(rds, &rainfo->rdnsss, entry) packlen += sizeof(struct nd_opt_rdnss) + 16 * rds->servercnt; TAILQ_FOREACH(dsl, &rainfo->dnssls, entry) { size_t domains_size = 0; packlen += sizeof(struct nd_opt_dnssl); /* * Each domain in the packet ends with a null byte. Account for * that here. */ TAILQ_FOREACH(dnsd, &dsl->dnssldoms, entry) domains_size += dnsd->length + 1; domains_size = (domains_size + 7) & ~7; packlen += domains_size; } /* allocate memory for the packet */ if ((buf = malloc(packlen)) == NULL) fatal(NULL); /* free the previous packet */ free(rainfo->ra_data); rainfo->ra_data = buf; /* XXX: what if packlen > 576? */ rainfo->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 = (u_int8_t)(0xff & rainfo->hoplimit); ra->nd_ra_flags_reserved = 0; /* just in case */ /* * XXX: the router preference field, which is a 2-bit field, should be * initialized before other fields. */ ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref; ra->nd_ra_flags_reserved |= rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0; ra->nd_ra_flags_reserved |= rainfo->otherflg ? ND_RA_FLAG_OTHER : 0; ra->nd_ra_router_lifetime = htons(rainfo->lifetime); ra->nd_ra_reachable = htonl(rainfo->reachabletime); ra->nd_ra_retransmit = htonl(rainfo->retranstimer); buf += sizeof(*ra); if (rainfo->advlinkopt) { lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf); buf += lladdroptlen; } if (rainfo->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(rainfo->linkmtu); buf += sizeof(struct nd_opt_mtu); } TAILQ_FOREACH(pfx, &rainfo->prefixes, entry) { u_int32_t vltime, pltime; struct timeval 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->prefixlen; ndopt_pi->nd_opt_pi_flags_reserved = 0; if (pfx->onlinkflg) ndopt_pi->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_ONLINK; if (pfx->autoconfflg) ndopt_pi->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO; if (pfx->vltimeexpire || pfx->pltimeexpire) gettimeofday(&now, NULL); if (pfx->vltimeexpire == 0) vltime = pfx->validlifetime; else vltime = (u_int32_t)(pfx->vltimeexpire > now.tv_sec ? pfx->vltimeexpire - now.tv_sec : 0); if (pfx->pltimeexpire == 0) pltime = pfx->preflifetime; else pltime = (u_int32_t)(pfx->pltimeexpire > now.tv_sec ? pfx->pltimeexpire - now.tv_sec : 0); if (vltime < pltime) { /* * this can happen if vltime is decremented 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->prefix; buf += sizeof(struct nd_opt_prefix_info); } TAILQ_FOREACH(rti, &rainfo->rtinfos, entry) { uint8_t psize = (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->prefixlen; ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref; ndopt_rti->nd_opt_rti_lifetime = htonl(rti->lifetime); memcpy(ndopt_rti + 1, &rti->prefix, psize * 8); buf += sizeof(struct nd_opt_route_info) + psize * 8; } TAILQ_FOREACH(rds, &rainfo->rdnsss, entry) { ndopt_rdnss = (struct nd_opt_rdnss *)buf; ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS; /* * An IPv6 address is 16 bytes, so multiply the number of * addresses by two to get a size in units of 8 bytes. */ ndopt_rdnss->nd_opt_rdnss_len = 1 + rds->servercnt * 2; ndopt_rdnss->nd_opt_rdnss_reserved = 0; ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rds->lifetime); buf += sizeof(struct nd_opt_rdnss); memcpy(buf, rds->servers, rds->servercnt * 16); buf += rds->servercnt * 16; } TAILQ_FOREACH(dsl, &rainfo->dnssls, entry) { u_int32_t size; ndopt_dnssl = (struct nd_opt_dnssl *)buf; ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL; ndopt_dnssl->nd_opt_dnssl_reserved = 0; ndopt_dnssl->nd_opt_dnssl_lifetime = htonl(dsl->lifetime); size = 0; TAILQ_FOREACH(dnsd, &dsl->dnssldoms, entry) size += dnsd->length + 1; /* align size on the next 8 byte boundary */ size = (size + 7) & ~7; ndopt_dnssl->nd_opt_dnssl_len = 1 + size / 8; buf += sizeof(struct nd_opt_dnssl); TAILQ_FOREACH(dnsd, &dsl->dnssldoms, entry) { char *curlabel_begin; char *curlabel_end; curlabel_begin = dnsd->domain; while ((curlabel_end = strchr(curlabel_begin, '.')) != NULL && curlabel_end > curlabel_begin) { size_t curlabel_size; curlabel_size = curlabel_end - curlabel_begin; *buf++ = curlabel_size; memcpy(buf, curlabel_begin, curlabel_size); buf += curlabel_size; curlabel_begin = curlabel_end + 1; } /* null-terminate the current domain */ *buf++ = '\0'; } /* zero out the end of the current option */ while (((uintptr_t)buf) % 8 != 0) *buf++ = '\0'; } } static int getinet6sysctl(int code) { int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; int value; size_t size; mib[3] = code; size = sizeof(value); if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0) { log_warn("failed to get ip6 sysctl(%d)", code); return(-1); } else return(value); }