--- embedaddon/dnsmasq/src/radv.c 2014/06/15 16:31:38 1.1.1.2 +++ embedaddon/dnsmasq/src/radv.c 2021/03/17 00:56:46 1.1.1.4 @@ -1,4 +1,4 @@ -/* dnsmasq is Copyright (c) 2000-2014 Simon Kelley +/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -28,11 +28,12 @@ struct ra_param { time_t now; - int ind, managed, other, found_context, first; + int ind, managed, other, first, adv_router; char *if_name; struct dhcp_netid *tags; struct in6_addr link_local, link_global, ula; - unsigned int glob_pref_time, link_pref_time, ula_pref_time, adv_interval; + unsigned int glob_pref_time, link_pref_time, ula_pref_time, adv_interval, prio; + struct dhcp_context *found_context; }; struct search_param { @@ -40,7 +41,18 @@ struct search_param { char name[IF_NAMESIZE+1]; }; +struct alias_param { + int iface; + struct dhcp_bridge *bridge; + int num_alias_ifs; + int max_alias_ifs; + int *alias_ifs; +}; + static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *dest); +static void send_ra_alias(time_t now, int iface, char *iface_name, struct in6_addr *dest, + int send_iface); +static int send_ra_to_aliases(int index, unsigned int type, char *mac, size_t maclen, void *parm); static int add_prefixes(struct in6_addr *local, int prefix, int scope, int if_index, int flags, unsigned int preferred, unsigned int valid, void *vparam); @@ -70,7 +82,7 @@ void ra_init(time_t now) /* ensure this is around even if we're not doing DHCPv6 */ expand_buf(&daemon->outpacket, sizeof(struct dhcp_packet)); - /* See if we're guessing SLAAC addresses, if so we need to recieve ping replies */ + /* See if we're guessing SLAAC addresses, if so we need to receive ping replies */ for (context = daemon->dhcp6; context; context = context->next) if ((context->flags & CONTEXT_RA_NAME)) break; @@ -100,10 +112,10 @@ void ra_init(time_t now) daemon->icmp6fd = fd; if (daemon->doing_ra) - ra_start_unsolicted(now, NULL); + ra_start_unsolicited(now, NULL); } -void ra_start_unsolicted(time_t now, struct dhcp_context *context) +void ra_start_unsolicited(time_t now, struct dhcp_context *context) { /* init timers so that we do ra's for some/all soon. some ra_times will end up zeroed if it's not appropriate to advertise those contexts. @@ -181,22 +193,51 @@ void icmp6_packet(time_t now) else if (packet[0] == ND_ROUTER_SOLICIT) { char *mac = ""; + struct dhcp_bridge *bridge, *alias; /* look for link-layer address option for logging */ if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz) { + if ((packet[9] * 8 - 2) * 3 - 1 >= MAXDNAME) { + return; + } print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2); mac = daemon->namebuff; } if (!option_bool(OPT_QUIET_RA)) my_syslog(MS_DHCP | LOG_INFO, "RTR-SOLICIT(%s) %s", interface, mac); - /* source address may not be valid in solicit request. */ - send_ra(now, if_index, interface, !IN6_IS_ADDR_UNSPECIFIED(&from.sin6_addr) ? &from.sin6_addr : NULL); + + /* If the incoming interface is an alias of some other one (as + specified by the --bridge-interface option), send an RA using + the context of the aliased interface. */ + for (bridge = daemon->bridges; bridge; bridge = bridge->next) + { + int bridge_index = if_nametoindex(bridge->iface); + if (bridge_index) + { + for (alias = bridge->alias; alias; alias = alias->next) + if (wildcard_matchn(alias->iface, interface, IF_NAMESIZE)) + { + /* Send an RA on if_index with information from + bridge_index. */ + send_ra_alias(now, bridge_index, bridge->iface, NULL, if_index); + break; + } + if (alias) + break; + } + } + + /* If the incoming interface wasn't an alias, send an RA using + the context of the incoming interface. */ + if (!bridge) + /* source address may not be valid in solicit request. */ + send_ra(now, if_index, interface, !IN6_IS_ADDR_UNSPECIFIED(&from.sin6_addr) ? &from.sin6_addr : NULL); } } -static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *dest) +static void send_ra_alias(time_t now, int iface, char *iface_name, struct in6_addr *dest, int send_iface) { struct ra_packet *ra; struct ra_param parm; @@ -205,33 +246,37 @@ static void send_ra(time_t now, int iface, char *iface struct dhcp_netid iface_id; struct dhcp_opt *opt_cfg; struct ra_interface *ra_param = find_iface_param(iface_name); - int done_dns = 0, old_prefix = 0; + int done_dns = 0, old_prefix = 0, mtu = 0; unsigned int min_pref_time; #ifdef HAVE_LINUX_NETWORK FILE *f; #endif - - save_counter(0); - ra = expand(sizeof(struct ra_packet)); - ra->type = ND_ROUTER_ADVERT; - ra->code = 0; - ra->hop_limit = hop_limit; - ra->flags = calc_prio(ra_param); - ra->lifetime = htons(calc_lifetime(ra_param)); - ra->reachable_time = 0; - ra->retrans_time = 0; - parm.ind = iface; parm.managed = 0; parm.other = 0; - parm.found_context = 0; + parm.found_context = NULL; + parm.adv_router = 0; parm.if_name = iface_name; parm.first = 1; parm.now = now; parm.glob_pref_time = parm.link_pref_time = parm.ula_pref_time = 0; parm.adv_interval = calc_interval(ra_param); + parm.prio = calc_prio(ra_param); + reset_counter(); + + if (!(ra = expand(sizeof(struct ra_packet)))) + return; + + ra->type = ND_ROUTER_ADVERT; + ra->code = 0; + ra->hop_limit = hop_limit; + ra->flags = parm.prio; + ra->lifetime = htons(calc_lifetime(ra_param)); + ra->reachable_time = 0; + ra->retrans_time = 0; + /* set tag with name == interface */ iface_id.net = iface_name; iface_id.next = NULL; @@ -243,7 +288,10 @@ static void send_ra(time_t now, int iface, char *iface context->netid.next = &context->netid; } - if (!iface_enumerate(AF_INET6, &parm, add_prefixes)) + /* If no link-local address then we can't advertise since source address of + advertisement must be link local address: RFC 4861 para 6.1.2. */ + if (!iface_enumerate(AF_INET6, &parm, add_prefixes) || + parm.link_pref_time == 0) return; /* Find smallest preferred time within address classes, @@ -269,8 +317,14 @@ static void send_ra(time_t now, int iface, char *iface unsigned int old = difftime(now, context->address_lost_time); if (old > context->saved_valid) - { + { /* We've advertised this enough, time to go */ + + /* If this context held the timeout, and there's another context in use + transfer the timeout there. */ + if (context->ra_time != 0 && parm.found_context && parm.found_context->ra_time == 0) + new_timeout(parm.found_context, iface_name, now); + *up = context->next; free(context); } @@ -286,8 +340,7 @@ static void send_ra(time_t now, int iface, char *iface setaddr6part(&local, addr6part(&local) & ~((context->prefix == 64) ? (u64)-1LL : (1LLU << (128 - context->prefix)) - 1LLU)); - if ((context->flags & - (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS))) + if (context->flags & CONTEXT_RA) { do_slaac = 1; if (context->flags & CONTEXT_DHCP) @@ -312,8 +365,10 @@ static void send_ra(time_t now, int iface, char *iface opt->type = ICMP6_OPT_PREFIX; opt->len = 4; opt->prefix_len = context->prefix; - /* autonomous only if we're not doing dhcp, always set "on-link" */ - opt->flags = do_slaac ? 0xC0 : 0x80; + /* autonomous only if we're not doing dhcp, set + "on-link" unless "off-link" was specified */ + opt->flags = (do_slaac ? 0x40 : 0) | + ((context->flags & CONTEXT_RA_OFF_LINK) ? 0 : 0x80); opt->valid_lifetime = htonl(context->saved_valid - old); opt->preferred_lifetime = htonl(0); opt->reserved = 0; @@ -339,24 +394,45 @@ static void send_ra(time_t now, int iface, char *iface if (!old_prefix && !parm.found_context) return; + /* If we're sending router address instead of prefix in at least on prefix, + include the advertisement interval option. */ + if (parm.adv_router) + { + put_opt6_char(ICMP6_OPT_ADV_INTERVAL); + put_opt6_char(1); + put_opt6_short(0); + /* interval value is in milliseconds */ + put_opt6_long(1000 * calc_interval(find_iface_param(iface_name))); + } + + /* Set the MTU from ra_param if any, an MTU of 0 mean automatic for linux, */ + /* an MTU of -1 prevents the option from being sent. */ + if (ra_param) + mtu = ra_param->mtu; #ifdef HAVE_LINUX_NETWORK - /* Note that IPv6 MTU is not necessarilly the same as the IPv4 MTU + /* Note that IPv6 MTU is not necessarily the same as the IPv4 MTU available from SIOCGIFMTU */ - sprintf(daemon->namebuff, "/proc/sys/net/ipv6/conf/%s/mtu", iface_name); - if ((f = fopen(daemon->namebuff, "r"))) + if (mtu == 0) { - if (fgets(daemon->namebuff, MAXDNAME, f)) - { - put_opt6_char(ICMP6_OPT_MTU); - put_opt6_char(1); - put_opt6_short(0); - put_opt6_long(atoi(daemon->namebuff)); - } - fclose(f); + char *mtu_name = ra_param ? ra_param->mtu_name : NULL; + sprintf(daemon->namebuff, "/proc/sys/net/ipv6/conf/%s/mtu", mtu_name ? mtu_name : iface_name); + if ((f = fopen(daemon->namebuff, "r"))) + { + if (fgets(daemon->namebuff, MAXDNAME, f)) + mtu = atoi(daemon->namebuff); + fclose(f); + } } #endif + if (mtu > 0) + { + put_opt6_char(ICMP6_OPT_MTU); + put_opt6_char(1); + put_opt6_short(0); + put_opt6_long(mtu); + } - iface_enumerate(AF_LOCAL, &iface, add_lla); + iface_enumerate(AF_LOCAL, &send_iface, add_lla); /* RDNSS, RFC 6106, use relevant DHCP6 options */ (void)option_filter(parm.tags, NULL, daemon->dhcp_opts6); @@ -464,14 +540,22 @@ static void send_ra(time_t now, int iface, char *iface else { inet_pton(AF_INET6, ALL_NODES, &addr.sin6_addr); - setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &iface, sizeof(iface)); + setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &send_iface, sizeof(send_iface)); } - while (sendto(daemon->icmp6fd, daemon->outpacket.iov_base, save_counter(0), 0, - (struct sockaddr *)&addr, sizeof(addr)) == -1 && retry_send()); + while (retry_send(sendto(daemon->icmp6fd, daemon->outpacket.iov_base, + save_counter(-1), 0, (struct sockaddr *)&addr, + sizeof(addr)))); } +static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *dest) +{ + /* Send an RA on the same interface that the RA content is based + on. */ + send_ra_alias(now, iface, iface_name, dest, iface); +} + static int add_prefixes(struct in6_addr *local, int prefix, int scope, int if_index, int flags, unsigned int preferred, unsigned int valid, void *vparam) @@ -500,6 +584,8 @@ static int add_prefixes(struct in6_addr *local, int p int do_slaac = 0; int deprecate = 0; int constructed = 0; + int adv_router = 0; + int off_link = 0; unsigned int time = 0xffffffff; struct dhcp_context *context; @@ -511,8 +597,7 @@ static int add_prefixes(struct in6_addr *local, int p { context->saved_valid = valid; - if ((context->flags & - (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS))) + if (context->flags & CONTEXT_RA) { do_slaac = 1; if (context->flags & CONTEXT_DHCP) @@ -530,10 +615,23 @@ static int add_prefixes(struct in6_addr *local, int p param->managed = 1; param->other = 1; } - - /* find floor time, don't reduce below 3 * RA interval. */ - if (time > context->lease_time) + + /* Configured to advertise router address, not prefix. See RFC 3775 7.2 + In this case we do all addresses associated with a context, + hence the real_prefix setting here. */ + if (context->flags & CONTEXT_RA_ROUTER) { + adv_router = 1; + param->adv_router = 1; + real_prefix = context->prefix; + } + + /* find floor time, don't reduce below 3 * RA interval. + If the lease time has been left as default, don't + use that as a floor. */ + if ((context->flags & CONTEXT_SETLEASE) && + time > context->lease_time) + { time = context->lease_time; if (time < ((unsigned int)(3 * param->adv_interval))) time = 3 * param->adv_interval; @@ -556,17 +654,20 @@ static int add_prefixes(struct in6_addr *local, int p /* subsequent prefixes on the same interface and subsequent instances of this prefix don't need timers. Be careful not to find the same prefix twice with different - addresses. */ + addresses unless we're advertising the actual addresses. */ if (!(context->flags & CONTEXT_RA_DONE)) { if (!param->first) context->ra_time = 0; context->flags |= CONTEXT_RA_DONE; real_prefix = context->prefix; + off_link = (context->flags & CONTEXT_RA_OFF_LINK); } - param->first = 0; - param->found_context = 1; + param->first = 0; + /* found_context is the _last_ one we found, so if there's + more than one, it's not the first. */ + param->found_context = context; } /* configured time is ceiling */ @@ -607,13 +708,19 @@ static int add_prefixes(struct in6_addr *local, int p if ((opt = expand(sizeof(struct prefix_opt)))) { /* zero net part of address */ - setaddr6part(local, addr6part(local) & ~((real_prefix == 64) ? (u64)-1LL : (1LLU << (128 - real_prefix)) - 1LLU)); + if (!adv_router) + setaddr6part(local, addr6part(local) & ~((real_prefix == 64) ? (u64)-1LL : (1LLU << (128 - real_prefix)) - 1LLU)); opt->type = ICMP6_OPT_PREFIX; opt->len = 4; opt->prefix_len = real_prefix; - /* autonomous only if we're not doing dhcp, always set "on-link" */ - opt->flags = do_slaac ? 0xC0 : 0x80; + /* autonomous only if we're not doing dhcp, set + "on-link" unless "off-link" was specified */ + opt->flags = (off_link ? 0 : 0x80); + if (do_slaac) + opt->flags |= 0x40; + if (adv_router) + opt->flags |= 0x20; opt->valid_lifetime = htonl(valid); opt->preferred_lifetime = htonl(preferred); opt->reserved = 0; @@ -655,6 +762,7 @@ time_t periodic_ra(time_t now) struct search_param param; struct dhcp_context *context; time_t next_event; + struct alias_param aparam; param.now = now; param.iface = 0; @@ -691,7 +799,7 @@ time_t periodic_ra(time_t now) associated with it, because it's for a subnet we dont have an interface on. Probably we're doing DHCP on a remote subnet via a relay. Zero the timer, since we won't - ever be able to send ra's and satistfy it. */ + ever be able to send ra's and satisfy it. */ context->ra_time = 0; if (param.iface != 0 && @@ -702,23 +810,105 @@ time_t periodic_ra(time_t now) if (tmp->name && wildcard_match(tmp->name, param.name)) break; if (!tmp) - send_ra(now, param.iface, param.name, NULL); + { + send_ra(now, param.iface, param.name, NULL); + + /* Also send on all interfaces that are aliases of this + one. */ + for (aparam.bridge = daemon->bridges; + aparam.bridge; + aparam.bridge = aparam.bridge->next) + if ((int)if_nametoindex(aparam.bridge->iface) == param.iface) + { + /* Count the number of alias interfaces for this + 'bridge', by calling iface_enumerate with + send_ra_to_aliases and NULL alias_ifs. */ + aparam.iface = param.iface; + aparam.alias_ifs = NULL; + aparam.num_alias_ifs = 0; + iface_enumerate(AF_LOCAL, &aparam, send_ra_to_aliases); + my_syslog(MS_DHCP | LOG_INFO, "RTR-ADVERT(%s) %s => %d alias(es)", + param.name, daemon->addrbuff, aparam.num_alias_ifs); + + /* Allocate memory to store the alias interface + indices. */ + aparam.alias_ifs = (int *)whine_malloc(aparam.num_alias_ifs * + sizeof(int)); + if (aparam.alias_ifs) + { + /* Use iface_enumerate again to get the alias + interface indices, then send on each of + those. */ + aparam.max_alias_ifs = aparam.num_alias_ifs; + aparam.num_alias_ifs = 0; + iface_enumerate(AF_LOCAL, &aparam, send_ra_to_aliases); + for (; aparam.num_alias_ifs; aparam.num_alias_ifs--) + { + my_syslog(MS_DHCP | LOG_INFO, "RTR-ADVERT(%s) %s => i/f %d", + param.name, daemon->addrbuff, + aparam.alias_ifs[aparam.num_alias_ifs - 1]); + send_ra_alias(now, + param.iface, + param.name, + NULL, + aparam.alias_ifs[aparam.num_alias_ifs - 1]); + } + free(aparam.alias_ifs); + } + + /* The source interface can only appear in at most + one --bridge-interface. */ + break; + } + } } } return next_event; } - + +static int send_ra_to_aliases(int index, unsigned int type, char *mac, size_t maclen, void *parm) +{ + struct alias_param *aparam = (struct alias_param *)parm; + char ifrn_name[IFNAMSIZ]; + struct dhcp_bridge *alias; + + (void)type; + (void)mac; + (void)maclen; + + if (if_indextoname(index, ifrn_name)) + for (alias = aparam->bridge->alias; alias; alias = alias->next) + if (wildcard_matchn(alias->iface, ifrn_name, IFNAMSIZ)) + { + if (aparam->alias_ifs && (aparam->num_alias_ifs < aparam->max_alias_ifs)) + aparam->alias_ifs[aparam->num_alias_ifs] = index; + aparam->num_alias_ifs++; + } + + return 1; +} + static int iface_search(struct in6_addr *local, int prefix, int scope, int if_index, int flags, int preferred, int valid, void *vparam) { struct search_param *param = vparam; struct dhcp_context *context; - + struct iname *tmp; + (void)scope; (void)preferred; (void)valid; - + + /* ignore interfaces we're not doing DHCP on. */ + if (!indextoname(daemon->icmp6fd, if_index, param->name) || + !iface_check(AF_LOCAL, NULL, param->name, NULL)) + return 1; + + for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next) + if (tmp->name && wildcard_match(tmp->name, param->name)) + return 1; + for (context = daemon->dhcp6; context; context = context->next) if (!(context->flags & (CONTEXT_TEMPLATE | CONTEXT_OLD)) && prefix <= context->prefix && @@ -730,16 +920,8 @@ static int iface_search(struct in6_addr *local, int p /* found an interface that's overdue for RA determine new timeout value and arrange for RA to be sent unless interface is still doing DAD.*/ - if (!(flags & IFACE_TENTATIVE)) param->iface = if_index; - - /* should never fail */ - if (!indextoname(daemon->icmp6fd, if_index, param->name)) - { - param->iface = 0; - return 0; - } new_timeout(context, param->name, param->now);