/* * $Id: send.c,v 1.30 2009/06/24 09:27:49 psavola Exp $ * * Authors: * Pedro Roque * Lars Fenneberg * * This software is Copyright 1996,1997 by the above mentioned author(s), * All Rights Reserved. * * The license which is distributed with this software in the file COPYRIGHT * applies to this software. If your distribution is missing this file, you * may request it from . * */ #include #include #include /* * Sends an advertisement for all specified clients of this interface * (or via broadcast, if there are no restrictions configured). * * If a destination address is given, the RA will be sent to the destination * address only, but only if it was configured. * */ void send_ra_forall(int sock, struct Interface *iface, struct in6_addr *dest) { struct Clients *current; /* If no list of clients was specified for this interface, we broadcast */ if (iface->ClientList == NULL) { send_ra(sock, iface, dest); return; } /* If clients are configured, send the advertisement to all of them via unicast */ for (current = iface->ClientList; current; current = current->next) { char address_text[INET6_ADDRSTRLEN]; memset(address_text, 0, sizeof(address_text)); if (get_debuglevel() >= 5) inet_ntop(AF_INET6, ¤t->Address, address_text, INET6_ADDRSTRLEN); /* If a non-authorized client sent a solicitation, ignore it (logging later) */ if (dest != NULL && memcmp(dest, ¤t->Address, sizeof(struct in6_addr)) != 0) continue; dlog(LOG_DEBUG, 5, "Sending RA to %s", address_text); send_ra(sock, iface, &(current->Address)); /* If we should only send the RA to a specific address, we are done */ if (dest != NULL) return; } if (dest == NULL) return; /* If we refused a client's solicitation, log it if debugging is high enough */ char address_text[INET6_ADDRSTRLEN]; memset(address_text, 0, sizeof(address_text)); if (get_debuglevel() >= 5) inet_ntop(AF_INET6, dest, address_text, INET6_ADDRSTRLEN); dlog(LOG_DEBUG, 5, "Not answering request from %s, not configured", address_text); } void send_ra(int sock, struct Interface *iface, struct in6_addr *dest) { uint8_t all_hosts_addr[] = {0xff,0x02,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; struct sockaddr_in6 addr; struct in6_pktinfo *pkt_info; struct msghdr mhdr; struct cmsghdr *cmsg; struct iovec iov; char __attribute__((aligned(8))) chdr[CMSG_SPACE(sizeof(struct in6_pktinfo))]; struct nd_router_advert *radvert; struct AdvPrefix *prefix; struct AdvRoute *route; struct AdvRDNSS *rdnss; /* XXX: we don't keep track if buff gets overflowed. In theory the sysadmin could do that with e.g., too many advertised prefixes or routes, but buff is just so large that this should never happen and if it does, it's admin's fault :-) */ unsigned char buff[MSG_SIZE]; size_t len = 0; ssize_t err; /* Foxconn added start pling 12/22/2011 */ unsigned long sec_since_initial_advert = 0; unsigned long remain_lifetime = 0; /* Foxconn added end pling 12/22/2011 */ /* First we need to check that the interface hasn't been removed or deactivated */ if(check_device(sock, iface) < 0) { if (iface->IgnoreIfMissing) /* a bit more quiet warning message.. */ dlog(LOG_DEBUG, 4, "interface %s does not exist, ignoring the interface", iface->Name); else { flog(LOG_WARNING, "interface %s does not exist, ignoring the interface", iface->Name); } iface->HasFailed = 1; } else { /* check_device was successful, act if it has failed previously */ if (iface->HasFailed == 1) { flog(LOG_WARNING, "interface %s seems to have come back up, trying to reinitialize", iface->Name); iface->HasFailed = 0; /* XXX: reinitializes 'iface', so this probably isn't going to work until next send_ra().. */ reload_config(); } } /* Make sure that we've joined the all-routers multicast group */ if (check_allrouters_membership(sock, iface) < 0) flog(LOG_WARNING, "problem checking all-routers membership on %s", iface->Name); dlog(LOG_DEBUG, 3, "sending RA on %s", iface->Name); /* Foxconn modified start pling 09/01/2010 */ /* IPv6 Self Test v5.0.0 always assume the RA is multicast */ //if ((dest == NULL) || // ( (dest->s6_addr32[0]==0) && (dest->s6_addr32[1]==0) && (dest->s6_addr32[2]==0) && (dest->s6_addr32[3]==0)) ) /* IPv6Ready- Test v6LC.2.2.9: Processing Router Solicitations, Bob added 07/15/2009 */ if (1) /* Foxconn modified end pling 09/01/2010 */ { struct timeval tv; dest = (struct in6_addr *)all_hosts_addr; gettimeofday(&tv, NULL); iface->last_multicast_sec = tv.tv_sec; iface->last_multicast_usec = tv.tv_usec; } memset((void *)&addr, 0, sizeof(addr)); addr.sin6_family = AF_INET6; addr.sin6_port = htons(IPPROTO_ICMPV6); memcpy(&addr.sin6_addr, dest, sizeof(struct in6_addr)); memset(&buff, 0, sizeof(buff)); radvert = (struct nd_router_advert *) buff; radvert->nd_ra_type = ND_ROUTER_ADVERT; radvert->nd_ra_code = 0; radvert->nd_ra_cksum = 0; radvert->nd_ra_curhoplimit = iface->AdvCurHopLimit; radvert->nd_ra_flags_reserved = (iface->AdvManagedFlag)?ND_RA_FLAG_MANAGED:0; radvert->nd_ra_flags_reserved |= (iface->AdvOtherConfigFlag)?ND_RA_FLAG_OTHER:0; /* Mobile IPv6 ext */ radvert->nd_ra_flags_reserved |= (iface->AdvHomeAgentFlag)?ND_RA_FLAG_HOME_AGENT:0; /* if forwarding is disabled, send zero router lifetime */ radvert->nd_ra_router_lifetime = !check_ip6_forwarding() ? htons(iface->AdvDefaultLifetime) : 0; radvert->nd_ra_flags_reserved |= (iface->AdvDefaultPreference << ND_OPT_RI_PRF_SHIFT) & ND_OPT_RI_PRF_MASK; radvert->nd_ra_reachable = htonl(iface->AdvReachableTime); radvert->nd_ra_retransmit = htonl(iface->AdvRetransTimer); len = sizeof(struct nd_router_advert); prefix = iface->AdvPrefixList; /* * add prefix options */ while(prefix) { /* Foxconn Perry added start, 2011/05/13, for IPv6 obsolete prefix information */ /* Router advertisment should not have obsolete prefix information for nornam RA */ if(iface->init_racount>=MAX_INITIAL_RTR_ADVERTISEMENTS && htonl(prefix->AdvValidLifetime)==0) { prefix = prefix->next; continue; } /* Foxconn Perry added end, 2011/05/13, for IPv6 obsolete prefix information */ if( prefix->enabled ) { struct nd_opt_prefix_info *pinfo; pinfo = (struct nd_opt_prefix_info *) (buff + len); pinfo->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION; pinfo->nd_opt_pi_len = 4; pinfo->nd_opt_pi_prefix_len = prefix->PrefixLen; pinfo->nd_opt_pi_flags_reserved = (prefix->AdvOnLinkFlag)?ND_OPT_PI_FLAG_ONLINK:0; pinfo->nd_opt_pi_flags_reserved |= (prefix->AdvAutonomousFlag)?ND_OPT_PI_FLAG_AUTO:0; /* Mobile IPv6 ext */ pinfo->nd_opt_pi_flags_reserved |= (prefix->AdvRouterAddr)?ND_OPT_PI_FLAG_RADDR:0; pinfo->nd_opt_pi_valid_time = htonl(prefix->AdvValidLifetime); /* Foxconn added start pling 12/22/2011 */ /* Advertise the remaining lifetime (in DHCP mode) */ if (use_dynamic_lifetime) { sec_since_initial_advert = get_current_time() - initial_advert_time; if (sec_since_initial_advert >= prefix->AdvValidLifetime) { /* prefix expired, do not advertise */ prefix = prefix->next; continue; } /* Advertise the remaining lifetime */ remain_lifetime = prefix->AdvValidLifetime - sec_since_initial_advert; pinfo->nd_opt_pi_valid_time = htonl(remain_lifetime); } /* Foxconn added end pling 12/22/2011 */ pinfo->nd_opt_pi_preferred_time = htonl(prefix->AdvPreferredLifetime); /* Foxconn added start pling 12/29/2011 */ /* Modify the "preferred lifetime" behaviour per Netgear request */ if (use_dynamic_lifetime) { if (sec_since_initial_advert >= prefix->AdvPreferredLifetime) pinfo->nd_opt_pi_preferred_time = htonl(0); else { remain_lifetime = prefix->AdvPreferredLifetime - sec_since_initial_advert; pinfo->nd_opt_pi_preferred_time = htonl(remain_lifetime); } } /* Foxconn added end pling 12/29/2011 */ pinfo->nd_opt_pi_reserved2 = 0; memcpy(&pinfo->nd_opt_pi_prefix, &prefix->Prefix, sizeof(struct in6_addr)); len += sizeof(*pinfo); } prefix = prefix->next; } route = iface->AdvRouteList; /* * add route options */ while(route) { struct nd_opt_route_info_local *rinfo; rinfo = (struct nd_opt_route_info_local *) (buff + len); rinfo->nd_opt_ri_type = ND_OPT_ROUTE_INFORMATION; /* XXX: the prefixes are allowed to be sent in smaller chunks as well */ rinfo->nd_opt_ri_len = 3; rinfo->nd_opt_ri_prefix_len = route->PrefixLen; rinfo->nd_opt_ri_flags_reserved = (route->AdvRoutePreference << ND_OPT_RI_PRF_SHIFT) & ND_OPT_RI_PRF_MASK; rinfo->nd_opt_ri_lifetime = htonl(route->AdvRouteLifetime); memcpy(&rinfo->nd_opt_ri_prefix, &route->Prefix, sizeof(struct in6_addr)); len += sizeof(*rinfo); route = route->next; } rdnss = iface->AdvRDNSSList; /* * add rdnss options */ while(rdnss) { struct nd_opt_rdnss_info_local *rdnssinfo; rdnssinfo = (struct nd_opt_rdnss_info_local *) (buff + len); rdnssinfo->nd_opt_rdnssi_type = ND_OPT_RDNSS_INFORMATION; rdnssinfo->nd_opt_rdnssi_len = 1 + 2*rdnss->AdvRDNSSNumber; rdnssinfo->nd_opt_rdnssi_pref_flag_reserved = ((rdnss->AdvRDNSSPreference << ND_OPT_RDNSSI_PREF_SHIFT) & ND_OPT_RDNSSI_PREF_MASK); rdnssinfo->nd_opt_rdnssi_pref_flag_reserved |= ((rdnss->AdvRDNSSOpenFlag)?ND_OPT_RDNSSI_FLAG_S:0); rdnssinfo->nd_opt_rdnssi_lifetime = htonl(rdnss->AdvRDNSSLifetime); memcpy(&rdnssinfo->nd_opt_rdnssi_addr1, &rdnss->AdvRDNSSAddr1, sizeof(struct in6_addr)); memcpy(&rdnssinfo->nd_opt_rdnssi_addr2, &rdnss->AdvRDNSSAddr2, sizeof(struct in6_addr)); memcpy(&rdnssinfo->nd_opt_rdnssi_addr3, &rdnss->AdvRDNSSAddr3, sizeof(struct in6_addr)); len += sizeof(*rdnssinfo) - (3-rdnss->AdvRDNSSNumber)*sizeof(struct in6_addr); rdnss = rdnss->next; } /* * add MTU option */ if (iface->AdvLinkMTU != 0) { struct nd_opt_mtu *mtu; mtu = (struct nd_opt_mtu *) (buff + len); mtu->nd_opt_mtu_type = ND_OPT_MTU; mtu->nd_opt_mtu_len = 1; mtu->nd_opt_mtu_reserved = 0; mtu->nd_opt_mtu_mtu = htonl(iface->AdvLinkMTU); len += sizeof(*mtu); } /* * add Source Link-layer Address option */ if (iface->AdvSourceLLAddress && iface->if_hwaddr_len != -1) { uint8_t *ucp; unsigned int i; ucp = (uint8_t *) (buff + len); *ucp++ = ND_OPT_SOURCE_LINKADDR; *ucp++ = (uint8_t) ((iface->if_hwaddr_len + 16 + 63) >> 6); len += 2 * sizeof(uint8_t); i = (iface->if_hwaddr_len + 7) >> 3; memcpy(buff + len, iface->if_hwaddr, i); len += i; } /* * Mobile IPv6 ext: Advertisement Interval Option to support * movement detection of mobile nodes */ if(iface->AdvIntervalOpt) { struct AdvInterval a_ival; uint32_t ival; if(iface->MaxRtrAdvInterval < Cautious_MaxRtrAdvInterval){ ival = ((iface->MaxRtrAdvInterval + Cautious_MaxRtrAdvInterval_Leeway ) * 1000); } else { ival = (iface->MaxRtrAdvInterval * 1000); } a_ival.type = ND_OPT_RTR_ADV_INTERVAL; a_ival.length = 1; a_ival.reserved = 0; a_ival.adv_ival = htonl(ival); memcpy(buff + len, &a_ival, sizeof(a_ival)); len += sizeof(a_ival); } /* * Mobile IPv6 ext: Home Agent Information Option to support * Dynamic Home Agent Address Discovery */ if(iface->AdvHomeAgentInfo && (iface->AdvMobRtrSupportFlag || iface->HomeAgentPreference != 0 || iface->HomeAgentLifetime != iface->AdvDefaultLifetime)) { struct HomeAgentInfo ha_info; ha_info.type = ND_OPT_HOME_AGENT_INFO; ha_info.length = 1; ha_info.flags_reserved = (iface->AdvMobRtrSupportFlag)?ND_OPT_HAI_FLAG_SUPPORT_MR:0; ha_info.preference = htons(iface->HomeAgentPreference); ha_info.lifetime = htons(iface->HomeAgentLifetime); memcpy(buff + len, &ha_info, sizeof(ha_info)); len += sizeof(ha_info); } iov.iov_len = len; iov.iov_base = (caddr_t) buff; memset(chdr, 0, sizeof(chdr)); cmsg = (struct cmsghdr *) chdr; cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); cmsg->cmsg_level = IPPROTO_IPV6; cmsg->cmsg_type = IPV6_PKTINFO; pkt_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); pkt_info->ipi6_ifindex = iface->if_index; memcpy(&pkt_info->ipi6_addr, &iface->if_addr, sizeof(struct in6_addr)); #ifdef HAVE_SIN6_SCOPE_ID if (IN6_IS_ADDR_LINKLOCAL(&addr.sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&addr.sin6_addr)) addr.sin6_scope_id = iface->if_index; #endif memset(&mhdr, 0, sizeof(mhdr)); mhdr.msg_name = (caddr_t)&addr; mhdr.msg_namelen = sizeof(struct sockaddr_in6); mhdr.msg_iov = &iov; mhdr.msg_iovlen = 1; mhdr.msg_control = (void *) cmsg; mhdr.msg_controllen = sizeof(chdr); err = sendmsg(sock, &mhdr, 0); if (err < 0) { if (!iface->IgnoreIfMissing || !(errno == EINVAL || errno == ENODEV)) flog(LOG_WARNING, "sendmsg: %s", strerror(errno)); else dlog(LOG_DEBUG, 3, "sendmsg: %s", strerror(errno)); } }