/* $OpenBSD: config.c,v 1.5 2000/03/13 06:16:11 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 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 #include #endif /* __FreeBSD__ >= 3 */ #include #include #include #include #include #include #include #ifdef MIP6 #include #endif #include #include #include #include #include #include #ifdef __NetBSD__ #include #endif #include #include "rtadvd.h" #include "advcap.h" #include "timer.h" #include "if.h" #include "config.h" static void makeentry __P((char *, int, char *, int)); static void get_prefix __P((struct rainfo *)); extern struct rainfo *ralist; void getconfig(intface) char *intface; { int stat, pfxs, i; char tbuf[BUFSIZ]; struct rainfo *tmp; long val; char buf[BUFSIZ]; char *bp = buf; char *addr; #define MUSTHAVE(var, cap) \ do { \ int 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) if ((stat = agetent(tbuf, intface)) <= 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", __FUNCTION__, intface); } tmp = (struct rainfo *)malloc(sizeof(*ralist)); memset(tmp, 0, sizeof(*tmp)); tmp->prefix.next = tmp->prefix.prev = &tmp->prefix; /* get interface information */ if (agetflag("nolladdr")) tmp->advlinkopt = 0; else tmp->advlinkopt = 1; if (tmp->advlinkopt) { if ((tmp->sdl = if_nametosdl(intface)) == NULL) { syslog(LOG_ERR, "<%s> can't get information of %s", __FUNCTION__, intface); exit(1); } tmp->ifindex = tmp->sdl->sdl_index; } else tmp->ifindex = if_nametoindex(intface); strncpy(tmp->ifname, intface, sizeof(tmp->ifname)); if ((tmp->phymtu = if_getmtu(intface)) == 0) { tmp->phymtu = IPV6_MMTU; syslog(LOG_WARNING, "<%s> can't get interface mtu of %s. Treat as %d", __FUNCTION__, intface, IPV6_MMTU); } /* * set router configuration variables. */ MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL); if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) { syslog(LOG_ERR, "<%s> maxinterval must be between %e and %u", __FUNCTION__, 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) { syslog(LOG_ERR, "<%s> mininterval must be between %e and %d", __FUNCTION__, 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; #ifdef MIP6 if (mobileip6) tmp->haflg = val & ND_RA_FLAG_HA; #endif MAYHAVE(val, "rltime", tmp->maxinterval * 3); if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) { syslog(LOG_ERR, "<%s> router lifetime on %s must be 0 or" " between %d and %d", __FUNCTION__, intface, tmp->maxinterval, MAXROUTERLIFETIME); exit(1); } tmp->lifetime = val & 0xffff; MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME); if (val > MAXREACHABLETIME) { syslog(LOG_ERR, "<%s> reachable time must be no greater than %d", __FUNCTION__, MAXREACHABLETIME); exit(1); } tmp->reachabletime = (u_int32_t)val; MAYHAVE(val, "retrans", DEF_ADVRETRANSTIMER); if (val < 0 || val > 0xffffffff) { syslog(LOG_ERR, "<%s> retrans time out of range", __FUNCTION__); exit(1); } tmp->retranstimer = (u_int32_t)val; #ifdef MIP6 if (!mobileip6) #else if (1) #endif { if (agetstr("hapref", &bp) || agetstr("hatime", &bp)) { syslog(LOG_ERR, "<%s> mobile-ip6 configuration without " "proper command line option", __FUNCTION__); exit(1); } } #ifdef MIP6 else { tmp->hapref = 0; if ((val = agetnum("hapref")) >= 0) tmp->hapref = (int16_t)val; if (tmp->hapref != 0) { tmp->hatime = 0; MUSTHAVE(val, "hatime"); tmp->hatime = (u_int16_t)val; if (tmp->hatime <= 0) { syslog(LOG_ERR, "<%s> home agent lifetime must be greater than 0", __FUNCTION__); exit(1); } } } #endif /* prefix information */ if ((pfxs = agetnum("addrs")) < 0) { /* auto configure prefix information */ if (agetstr("addr", &bp) || agetstr("addr1", &bp)) { syslog(LOG_ERR, "<%s> conflicting prefix configuration for %s: " "automatic and manual config at the same time", __FUNCTION__, intface); exit(1); } get_prefix(tmp); } else { tmp->pfxs = pfxs; for (i = 0; i < pfxs; i++) { struct prefix *pfx; char entbuf[256]; int added = (pfxs > 1) ? 1 : 0; /* allocate memory to store prefix information */ if ((pfx = malloc(sizeof(struct prefix))) == NULL) { syslog(LOG_ERR, "<%s> can't allocate enough memory", __FUNCTION__); exit(1); } /* link into chain */ insque(pfx, &tmp->prefix); makeentry(entbuf, i, "prefixlen", added); MAYHAVE(val, entbuf, 64); if (val < 0 || val > 128) { syslog(LOG_ERR, "<%s> prefixlen out of range", __FUNCTION__); exit(1); } pfx->prefixlen = (int)val; makeentry(entbuf, i, "pinfoflags", added); #ifdef MIP6 if (mobileip6) { MAYHAVE(val, entbuf, (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO| ND_OPT_PI_FLAG_RTADDR)); } else #endif { 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; #ifdef MIP6 if (mobileip6) pfx->routeraddr = val & ND_OPT_PI_FLAG_RTADDR; #endif makeentry(entbuf, i, "vltime", added); MAYHAVE(val, entbuf, DEF_ADVVALIDLIFETIME); if (val < 0 || val > 0xffffffff) { syslog(LOG_ERR, "<%s> vltime out of range", __FUNCTION__); exit(1); } pfx->validlifetime = (u_int32_t)val; makeentry(entbuf, i, "pltime", added); MAYHAVE(val, entbuf, DEF_ADVPREFERREDLIFETIME); if (val < 0 || val > 0xffffffff) { syslog(LOG_ERR, "<%s> pltime out of range", __FUNCTION__); exit(1); } pfx->preflifetime = (u_int32_t)val; makeentry(entbuf, i, "addr", added); addr = (char *)agetstr(entbuf, &bp); if (addr == NULL) { syslog(LOG_ERR, "<%s> need %s as an prefix for " "interface %s", __FUNCTION__, entbuf, intface); exit(1); } if (inet_pton(AF_INET6, addr, &pfx->prefix) != 1) { syslog(LOG_ERR, "<%s> inet_pton failed for %s", __FUNCTION__, addr); exit(1); } if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) { syslog(LOG_ERR, "<%s> multicast prefix(%s) must " "not be advertised (IF=%s)", __FUNCTION__, addr, intface); exit(1); } if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix)) syslog(LOG_NOTICE, "<%s> link-local prefix(%s) will be" " advertised on %s", __FUNCTION__, addr, intface); } } MAYHAVE(val, "mtu", 0); if (val < 0 || val > 0xffffffff) { syslog(LOG_ERR, "<%s> mtu out of range", __FUNCTION__); exit(1); } tmp->linkmtu = (u_int32_t)val; if (tmp->linkmtu == 0) { char *mtustr; if ((mtustr = (char *)agetstr("mtu", &bp)) && strcmp(mtustr, "auto") == 0) tmp->linkmtu = tmp->phymtu; } else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) { syslog(LOG_ERR, "<%s> advertised link mtu must be between" " least MTU and physical link MTU", __FUNCTION__); exit(1); } /* okey */ tmp->next = ralist; ralist = tmp; /* construct the sending packet */ make_packet(tmp); /* set timer */ tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update, tmp, tmp); ra_timer_update((void *)tmp, &tmp->timer->tm); rtadvd_set_timer(&tmp->timer->tm, tmp->timer); } static void get_prefix(struct rainfo *rai) { size_t len; u_char *buf, *lim, *next; u_char ntopbuf[INET6_ADDRSTRLEN]; if ((len = rtbuf_len()) < 0) { syslog(LOG_ERR, "<%s> can't get buffer length for routing info", __FUNCTION__); exit(1); } if ((buf = malloc(len)) == NULL) { syslog(LOG_ERR, "<%s> can't allocate buffer", __FUNCTION__); exit(1); } if (get_rtinfo(buf, &len) < 0) { syslog(LOG_ERR, "<%s> can't get routing inforamtion", __FUNCTION__); exit(1); } lim = buf + len; next = get_next_msg(buf, lim, rai->ifindex, &len, RTADV_TYPE2BITMASK(RTM_GET)); while (next < lim) { struct prefix *pp; struct in6_addr *a; /* allocate memory to store prefix info. */ if ((pp = malloc(sizeof(*pp))) == NULL) { syslog(LOG_ERR, "<%s> can't get allocate buffer for prefix", __FUNCTION__); exit(1); } memset(pp, 0, sizeof(*pp)); /* set prefix and its length */ a = get_addr(next); memcpy(&pp->prefix, a, sizeof(*a)); if ((pp->prefixlen = get_prefixlen(next)) < 0) { syslog(LOG_ERR, "<%s> failed to get prefixlen " "or prefixl is invalid", __FUNCTION__); exit(1); } syslog(LOG_DEBUG, "<%s> add %s/%d to prefix list on %s", __FUNCTION__, inet_ntop(AF_INET6, a, ntopbuf, INET6_ADDRSTRLEN), pp->prefixlen, rai->ifname); /* set other fields with protocol defaults */ pp->validlifetime = DEF_ADVVALIDLIFETIME; pp->preflifetime = DEF_ADVPREFERREDLIFETIME; pp->onlinkflg = 1; pp->autoconfflg = 1; /* link into chain */ insque(pp, &rai->prefix); /* counter increment */ rai->pfxs++; /* forward pointer and get next prefix(if any) */ next += len; next = get_next_msg(next, lim, rai->ifindex, &len, RTADV_TYPE2BITMASK(RTM_GET)); } free(buf); } static void makeentry(buf, id, string, add) char *buf, *string; int id, add; { strcpy(buf, string); if (add) { char *cp; cp = (char *)index(buf, '\0'); cp += sprintf(cp, "%d", id); *cp = '\0'; } } /* * Add a prefix to the list of specified interface and reconstruct * the outgoing packet. * The prefix must not be in the list. * XXX: other parameter of the prefix(e.g. lifetime) shoule be * able to be specified. */ static void add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr) { struct prefix *prefix; u_char ntopbuf[INET6_ADDRSTRLEN]; if ((prefix = malloc(sizeof(*prefix))) == NULL) { syslog(LOG_ERR, "<%s> memory allocation failed", __FUNCTION__); return; /* XXX: error or exit? */ } prefix->prefix = ipr->ipr_prefix.sin6_addr; prefix->prefixlen = ipr->ipr_plen; prefix->validlifetime = ipr->ipr_vltime; prefix->preflifetime = ipr->ipr_pltime; prefix->onlinkflg = ipr->ipr_raf_onlink; prefix->autoconfflg = ipr->ipr_raf_auto; insque(prefix, &rai->prefix); syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s", __FUNCTION__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, INET6_ADDRSTRLEN), ipr->ipr_plen, rai->ifname); /* free the previous packet */ free(rai->ra_data); rai->ra_data = 0; /* 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((void *)rai, &rai->timer->tm); rtadvd_set_timer(&rai->timer->tm, rai->timer); } /* * 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]; remque(prefix); syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s", __FUNCTION__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname); free(prefix); rai->pfxs--; make_packet(rai); } /* * 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) { int s; if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__, strerror(errno)); exit(1); } if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) { syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __FUNCTION__, 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) { u_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", __FUNCTION__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, sizeof(ntopbuf)), ipr->ipr_origin); close(s); return 1; } close(s); return 0; } 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", __FUNCTION__, 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 *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; #ifdef MIP6 struct nd_opt_advint *ndopt_advint; struct nd_opt_hai *ndopt_hai; #endif struct prefix *pfx; /* calculate total length */ packlen = sizeof(struct nd_router_advert); if (rainfo->advlinkopt) { if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) { syslog(LOG_INFO, "<%s> link-layer address option has" " null length on %s." " Treat as not included.", __FUNCTION__, 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); #ifdef MIP6 if (mobileip6 && rainfo->maxinterval) packlen += sizeof(struct nd_opt_advint); if (mobileip6 && rainfo->hatime) packlen += sizeof(struct nd_opt_hai); #endif /* allocate memory for the packet */ if ((buf = malloc(packlen)) == NULL) { syslog(LOG_ERR, "<%s> can't get enough memory for an RA packet", __FUNCTION__); exit(1); } 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; ra->nd_ra_flags_reserved |= rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0; ra->nd_ra_flags_reserved |= rainfo->otherflg ? ND_RA_FLAG_OTHER : 0; #ifdef MIP6 ra->nd_ra_flags_reserved |= rainfo->haflg ? ND_RA_FLAG_HA : 0; #endif 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 = ntohl(rainfo->linkmtu); buf += sizeof(struct nd_opt_mtu); } #ifdef MIP6 if (mobileip6 && rainfo->maxinterval) { ndopt_advint = (struct nd_opt_advint *)buf; ndopt_advint->nd_opt_int_type = ND_OPT_ADV_INTERVAL; ndopt_advint->nd_opt_int_len = 1; ndopt_advint->nd_opt_int_reserved = 0; ndopt_advint->nd_opt_int_interval = ntohl(rainfo->maxinterval * 1000); buf += sizeof(struct nd_opt_advint); } #endif #ifdef MIP6 if (rainfo->hatime) { ndopt_hai = (struct nd_opt_hai *)buf; ndopt_hai->nd_opt_hai_type = ND_OPT_HA_INFORMATION; ndopt_hai->nd_opt_hai_len = 1; ndopt_hai->nd_opt_hai_reserved = 0; ndopt_hai->nd_opt_hai_pref = ntohs(rainfo->hapref); ndopt_hai->nd_opt_hai_lifetime = ntohs(rainfo->hatime); buf += sizeof(struct nd_opt_hai); } #endif for (pfx = rainfo->prefix.next; pfx != &rainfo->prefix; pfx = pfx->next) { 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; #ifdef MIP6 if (pfx->routeraddr) ndopt_pi->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_RTADDR; #endif ndopt_pi->nd_opt_pi_valid_time = ntohl(pfx->validlifetime); ndopt_pi->nd_opt_pi_preferred_time = ntohl(pfx->preflifetime); ndopt_pi->nd_opt_pi_reserved2 = 0; ndopt_pi->nd_opt_pi_prefix = pfx->prefix; buf += sizeof(struct nd_opt_prefix_info); } return; }