/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include "af-list.h" #include "alloc-util.h" #include "conf-parser.h" #include "fileio.h" #include "format-util.h" #include "ip-protocol-list.h" #include "netlink-util.h" #include "networkd-manager.h" #include "networkd-routing-policy-rule.h" #include "networkd-util.h" #include "parse-util.h" #include "socket-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "user-util.h" static const char *const fr_act_type_table[__FR_ACT_MAX] = { [FR_ACT_BLACKHOLE] = "blackhole", [FR_ACT_UNREACHABLE] = "unreachable", [FR_ACT_PROHIBIT] = "prohibit", }; assert_cc(__FR_ACT_MAX <= UINT8_MAX); DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(fr_act_type, int); RoutingPolicyRule *routing_policy_rule_free(RoutingPolicyRule *rule) { if (!rule) return NULL; if (rule->network) { assert(rule->section); hashmap_remove(rule->network->rules_by_section, rule->section); } if (rule->manager) { set_remove(rule->manager->rules, rule); set_remove(rule->manager->rules_foreign, rule); } network_config_section_free(rule->section); free(rule->iif); free(rule->oif); return mfree(rule); } DEFINE_NETWORK_SECTION_FUNCTIONS(RoutingPolicyRule, routing_policy_rule_free); static int routing_policy_rule_new(RoutingPolicyRule **ret) { RoutingPolicyRule *rule; rule = new(RoutingPolicyRule, 1); if (!rule) return -ENOMEM; *rule = (RoutingPolicyRule) { .table = RT_TABLE_MAIN, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, .protocol = RTPROT_UNSPEC, .type = FR_ACT_TO_TBL, }; *ret = rule; return 0; } static int routing_policy_rule_new_static(Network *network, const char *filename, unsigned section_line, RoutingPolicyRule **ret) { _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *rule = NULL; _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL; int r; assert(network); assert(ret); assert(filename); assert(section_line > 0); r = network_config_section_new(filename, section_line, &n); if (r < 0) return r; rule = hashmap_get(network->rules_by_section, n); if (rule) { *ret = TAKE_PTR(rule); return 0; } r = routing_policy_rule_new(&rule); if (r < 0) return r; rule->network = network; rule->section = TAKE_PTR(n); rule->protocol = RTPROT_STATIC; r = hashmap_ensure_allocated(&network->rules_by_section, &network_config_hash_ops); if (r < 0) return r; r = hashmap_put(network->rules_by_section, rule->section, rule); if (r < 0) return r; *ret = TAKE_PTR(rule); return 0; } static int routing_policy_rule_copy(RoutingPolicyRule *dest, const RoutingPolicyRule *src) { _cleanup_free_ char *iif = NULL, *oif = NULL; assert(dest); assert(src); if (src->iif) { iif = strdup(src->iif); if (!iif) return -ENOMEM; } if (src->oif) { oif = strdup(src->oif); if (!oif) return -ENOMEM; } dest->family = src->family; dest->from = src->from; dest->from_prefixlen = src->from_prefixlen; dest->to = src->to; dest->to_prefixlen = src->to_prefixlen; dest->invert_rule = src->invert_rule; dest->tos = src->tos; dest->type = src->type; dest->fwmark = src->fwmark; dest->fwmask = src->fwmask; dest->priority = src->priority; dest->table = src->table; dest->iif = TAKE_PTR(iif); dest->oif = TAKE_PTR(oif); dest->ipproto = src->ipproto; dest->protocol = src->protocol; dest->sport = src->sport; dest->dport = src->dport; dest->uid_range = src->uid_range; dest->suppress_prefixlen = src->suppress_prefixlen; return 0; } static void routing_policy_rule_hash_func(const RoutingPolicyRule *rule, struct siphash *state) { assert(rule); siphash24_compress(&rule->family, sizeof(rule->family), state); switch (rule->family) { case AF_INET: case AF_INET6: siphash24_compress(&rule->from, FAMILY_ADDRESS_SIZE(rule->family), state); siphash24_compress(&rule->from_prefixlen, sizeof(rule->from_prefixlen), state); siphash24_compress(&rule->to, FAMILY_ADDRESS_SIZE(rule->family), state); siphash24_compress(&rule->to_prefixlen, sizeof(rule->to_prefixlen), state); siphash24_compress_boolean(rule->invert_rule, state); siphash24_compress(&rule->tos, sizeof(rule->tos), state); siphash24_compress(&rule->type, sizeof(rule->type), state); siphash24_compress(&rule->fwmark, sizeof(rule->fwmark), state); siphash24_compress(&rule->fwmask, sizeof(rule->fwmask), state); siphash24_compress(&rule->priority, sizeof(rule->priority), state); siphash24_compress(&rule->table, sizeof(rule->table), state); siphash24_compress(&rule->suppress_prefixlen, sizeof(rule->suppress_prefixlen), state); siphash24_compress(&rule->ipproto, sizeof(rule->ipproto), state); siphash24_compress(&rule->protocol, sizeof(rule->protocol), state); siphash24_compress(&rule->sport, sizeof(rule->sport), state); siphash24_compress(&rule->dport, sizeof(rule->dport), state); siphash24_compress(&rule->uid_range, sizeof(rule->uid_range), state); siphash24_compress_string(rule->iif, state); siphash24_compress_string(rule->oif, state); break; default: /* treat any other address family as AF_UNSPEC */ break; } } static int routing_policy_rule_compare_func(const RoutingPolicyRule *a, const RoutingPolicyRule *b) { int r; r = CMP(a->family, b->family); if (r != 0) return r; switch (a->family) { case AF_INET: case AF_INET6: r = CMP(a->from_prefixlen, b->from_prefixlen); if (r != 0) return r; r = memcmp(&a->from, &b->from, FAMILY_ADDRESS_SIZE(a->family)); if (r != 0) return r; r = CMP(a->to_prefixlen, b->to_prefixlen); if (r != 0) return r; r = memcmp(&a->to, &b->to, FAMILY_ADDRESS_SIZE(a->family)); if (r != 0) return r; r = CMP(a->invert_rule, b->invert_rule); if (r != 0) return r; r = CMP(a->tos, b->tos); if (r != 0) return r; r = CMP(a->type, b->type); if (r != 0) return r; r = CMP(a->fwmark, b->fwmark); if (r != 0) return r; r = CMP(a->fwmask, b->fwmask); if (r != 0) return r; r = CMP(a->priority, b->priority); if (r != 0) return r; r = CMP(a->table, b->table); if (r != 0) return r; r = CMP(a->suppress_prefixlen, b->suppress_prefixlen); if (r != 0) return r; r = CMP(a->ipproto, b->ipproto); if (r != 0) return r; r = CMP(a->protocol, b->protocol); if (r != 0) return r; r = memcmp(&a->sport, &b->sport, sizeof(a->sport)); if (r != 0) return r; r = memcmp(&a->dport, &b->dport, sizeof(a->dport)); if (r != 0) return r; r = memcmp(&a->uid_range, &b->uid_range, sizeof(a->uid_range)); if (r != 0) return r; r = strcmp_ptr(a->iif, b->iif); if (r != 0) return r; r = strcmp_ptr(a->oif, b->oif); if (r != 0) return r; return 0; default: /* treat any other address family as AF_UNSPEC */ return 0; } } static bool routing_policy_rule_equal(const RoutingPolicyRule *rule1, const RoutingPolicyRule *rule2) { if (rule1 == rule2) return true; if (!rule1 || !rule2) return false; return routing_policy_rule_compare_func(rule1, rule2) == 0; } DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( routing_policy_rule_hash_ops, RoutingPolicyRule, routing_policy_rule_hash_func, routing_policy_rule_compare_func, routing_policy_rule_free); static int routing_policy_rule_get(Manager *m, const RoutingPolicyRule *rule, RoutingPolicyRule **ret) { RoutingPolicyRule *existing; assert(m); existing = set_get(m->rules, rule); if (existing) { if (ret) *ret = existing; return 1; } existing = set_get(m->rules_foreign, rule); if (existing) { if (ret) *ret = existing; return 0; } return -ENOENT; } static int routing_policy_rule_add_internal(Manager *m, Set **rules, const RoutingPolicyRule *in, int family, RoutingPolicyRule **ret) { _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *rule = NULL; int r; assert(m); assert(rules); assert(in); assert(IN_SET(family, AF_INET, AF_INET6)); assert(in->family == AF_UNSPEC || in->family == family); r = routing_policy_rule_new(&rule); if (r < 0) return r; r = routing_policy_rule_copy(rule, in); if (r < 0) return r; rule->family = family; r = set_ensure_put(rules, &routing_policy_rule_hash_ops, rule); if (r < 0) return r; if (r == 0) return -EEXIST; rule->manager = m; if (ret) *ret = rule; TAKE_PTR(rule); return 0; } static int routing_policy_rule_add(Manager *m, const RoutingPolicyRule *rule, int family, RoutingPolicyRule **ret) { return routing_policy_rule_add_internal(m, &m->rules, rule, family, ret); } static int routing_policy_rule_add_foreign(Manager *m, const RoutingPolicyRule *rule, RoutingPolicyRule **ret) { return routing_policy_rule_add_internal(m, &m->rules_foreign, rule, rule->family, ret); } static void log_routing_policy_rule_debug(const RoutingPolicyRule *rule, int family, const char *str, const Link *link) { assert(rule); assert(IN_SET(family, AF_INET, AF_INET6)); assert(str); /* link may be NULL. */ if (DEBUG_LOGGING) { _cleanup_free_ char *from = NULL, *to = NULL; (void) in_addr_to_string(family, &rule->from, &from); (void) in_addr_to_string(family, &rule->to, &to); log_link_debug(link, "%s routing policy rule: priority: %"PRIu32", %s/%u -> %s/%u, iif: %s, oif: %s, table: %"PRIu32, str, rule->priority, strna(from), rule->from_prefixlen, strna(to), rule->to_prefixlen, strna(rule->iif), strna(rule->oif), rule->table); } } static int routing_policy_rule_set_netlink_message(const RoutingPolicyRule *rule, sd_netlink_message *m, Link *link) { int r; assert(rule); assert(m); /* link may be NULL. */ if (in_addr_is_null(rule->family, &rule->from) == 0) { r = netlink_message_append_in_addr_union(m, FRA_SRC, rule->family, &rule->from); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_SRC attribute: %m"); r = sd_rtnl_message_routing_policy_rule_set_fib_src_prefixlen(m, rule->from_prefixlen); if (r < 0) return log_link_error_errno(link, r, "Could not set source prefix length: %m"); } if (in_addr_is_null(rule->family, &rule->to) == 0) { r = netlink_message_append_in_addr_union(m, FRA_DST, rule->family, &rule->to); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_DST attribute: %m"); r = sd_rtnl_message_routing_policy_rule_set_fib_dst_prefixlen(m, rule->to_prefixlen); if (r < 0) return log_link_error_errno(link, r, "Could not set destination prefix length: %m"); } r = sd_netlink_message_append_u32(m, FRA_PRIORITY, rule->priority); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_PRIORITY attribute: %m"); if (rule->tos > 0) { r = sd_rtnl_message_routing_policy_rule_set_tos(m, rule->tos); if (r < 0) return log_link_error_errno(link, r, "Could not set IP rule TOS: %m"); } if (rule->table < 256) { r = sd_rtnl_message_routing_policy_rule_set_table(m, rule->table); if (r < 0) return log_link_error_errno(link, r, "Could not set IP rule table: %m"); } else { r = sd_rtnl_message_routing_policy_rule_set_table(m, RT_TABLE_UNSPEC); if (r < 0) return log_link_error_errno(link, r, "Could not set IP rule table: %m"); r = sd_netlink_message_append_u32(m, FRA_TABLE, rule->table); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_TABLE attribute: %m"); } if (rule->fwmark > 0) { r = sd_netlink_message_append_u32(m, FRA_FWMARK, rule->fwmark); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_FWMARK attribute: %m"); r = sd_netlink_message_append_u32(m, FRA_FWMASK, rule->fwmask); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_FWMASK attribute: %m"); } if (rule->iif) { r = sd_netlink_message_append_string(m, FRA_IIFNAME, rule->iif); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_IIFNAME attribute: %m"); } if (rule->oif) { r = sd_netlink_message_append_string(m, FRA_OIFNAME, rule->oif); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_OIFNAME attribute: %m"); } r = sd_netlink_message_append_u8(m, FRA_IP_PROTO, rule->ipproto); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_IP_PROTO attribute: %m"); r = sd_netlink_message_append_u8(m, FRA_PROTOCOL, rule->protocol); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_PROTOCOL attribute: %m"); if (rule->sport.start != 0 || rule->sport.end != 0) { r = sd_netlink_message_append_data(m, FRA_SPORT_RANGE, &rule->sport, sizeof(rule->sport)); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_SPORT_RANGE attribute: %m"); } if (rule->dport.start != 0 || rule->dport.end != 0) { r = sd_netlink_message_append_data(m, FRA_DPORT_RANGE, &rule->dport, sizeof(rule->dport)); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_DPORT_RANGE attribute: %m"); } if (rule->uid_range.start != UID_INVALID && rule->uid_range.end != UID_INVALID) { r = sd_netlink_message_append_data(m, FRA_UID_RANGE, &rule->uid_range, sizeof(rule->uid_range)); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_UID_RANGE attribute: %m"); } if (rule->invert_rule) { r = sd_rtnl_message_routing_policy_rule_set_flags(m, FIB_RULE_INVERT); if (r < 0) return log_link_error_errno(link, r, "Could not append FIB_RULE_INVERT attribute: %m"); } if (rule->suppress_prefixlen >= 0) { r = sd_netlink_message_append_u32(m, FRA_SUPPRESS_PREFIXLEN, (uint32_t) rule->suppress_prefixlen); if (r < 0) return log_link_error_errno(link, r, "Could not append FRA_SUPPRESS_PREFIXLEN attribute: %m"); } if (rule->type != FR_ACT_TO_TBL) { r = sd_rtnl_message_routing_policy_rule_set_fib_type(m, rule->type); if (r < 0) return log_link_error_errno(link, r, "Could not append FIB rule type attribute: %m"); } return 0; } static int routing_policy_rule_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { int r; assert(m); r = sd_netlink_message_get_errno(m); if (r < 0) log_message_warning_errno(m, r, "Could not drop routing policy rule"); return 1; } static int routing_policy_rule_remove(const RoutingPolicyRule *rule, Manager *manager) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; int r; assert(rule); assert(manager); assert(manager->rtnl); assert(IN_SET(rule->family, AF_INET, AF_INET6)); log_routing_policy_rule_debug(rule, rule->family, "Removing", NULL); r = sd_rtnl_message_new_routing_policy_rule(manager->rtnl, &m, RTM_DELRULE, rule->family); if (r < 0) return log_error_errno(r, "Could not allocate RTM_DELRULE message: %m"); r = routing_policy_rule_set_netlink_message(rule, m, NULL); if (r < 0) return r; r = sd_netlink_call_async(manager->rtnl, NULL, m, routing_policy_rule_remove_handler, NULL, NULL, 0, __func__); if (r < 0) return log_error_errno(r, "Could not send rtnetlink message: %m"); return 0; } static int routing_policy_rule_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(rtnl); assert(m); assert(link); assert(link->ifname); assert(link->routing_policy_rule_messages > 0); link->routing_policy_rule_messages--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Could not add routing policy rule"); link_enter_failed(link); return 1; } if (link->routing_policy_rule_messages == 0) { log_link_debug(link, "Routing policy rule configured"); link->routing_policy_rules_configured = true; link_check_ready(link); } return 1; } static int routing_policy_rule_configure_internal(const RoutingPolicyRule *rule, int family, Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; int r; assert(rule); assert(link); assert(link->ifindex > 0); assert(link->manager); assert(link->manager->rtnl); log_routing_policy_rule_debug(rule, family, "Configuring", link); r = sd_rtnl_message_new_routing_policy_rule(link->manager->rtnl, &m, RTM_NEWRULE, family); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_NEWRULE message: %m"); r = routing_policy_rule_set_netlink_message(rule, m, link); if (r < 0) return r; r = netlink_call_async(link->manager->rtnl, NULL, m, routing_policy_rule_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); link->routing_policy_rule_messages++; r = routing_policy_rule_add(link->manager, rule, family, NULL); if (r < 0) return log_link_error_errno(link, r, "Could not add rule: %m"); return 1; } static int routing_policy_rule_configure(const RoutingPolicyRule *rule, Link *link) { int r; if (IN_SET(rule->family, AF_INET, AF_INET6)) return routing_policy_rule_configure_internal(rule, rule->family, link); if (FLAGS_SET(rule->address_family, ADDRESS_FAMILY_IPV4)) { r = routing_policy_rule_configure_internal(rule, AF_INET, link); if (r < 0) return r; } if (FLAGS_SET(rule->address_family, ADDRESS_FAMILY_IPV6)) { r = routing_policy_rule_configure_internal(rule, AF_INET6, link); if (r < 0) return r; } return 0; } static bool links_have_routing_policy_rule(const Manager *m, const RoutingPolicyRule *rule, const Link *except) { Link *link; assert(m); assert(rule); HASHMAP_FOREACH(link, m->links) { RoutingPolicyRule *link_rule; if (link == except) continue; if (!link->network) continue; HASHMAP_FOREACH(link_rule, link->network->rules_by_section) if (routing_policy_rule_equal(link_rule, rule)) return true; } return false; } int manager_drop_routing_policy_rules_internal(Manager *m, bool foreign, const Link *except) { RoutingPolicyRule *rule; int k, r = 0; Set *rules; assert(m); rules = foreign ? m->rules_foreign : m->rules; SET_FOREACH(rule, rules) { /* Do not touch rules managed by kernel. */ if (rule->protocol == RTPROT_KERNEL) continue; /* The rule will be configured later, or already configured by a link. */ if (links_have_routing_policy_rule(m, rule, except)) continue; k = routing_policy_rule_remove(rule, m); if (k < 0 && r >= 0) r = k; } return r; } int link_set_routing_policy_rules(Link *link) { RoutingPolicyRule *rule; int r; assert(link); assert(link->network); if (link->routing_policy_rule_messages != 0) { log_link_debug(link, "Routing policy rules are configuring."); return 0; } link->routing_policy_rules_configured = false; HASHMAP_FOREACH(rule, link->network->rules_by_section) { RoutingPolicyRule *existing; r = routing_policy_rule_get(link->manager, rule, &existing); if (r > 0) continue; if (r == 0) { r = set_ensure_put(&link->manager->rules, &routing_policy_rule_hash_ops, existing); if (r < 0) return log_link_warning_errno(link, r, "Could not store existing routing policy rule: %m"); set_remove(link->manager->rules_foreign, existing); continue; } r = routing_policy_rule_configure(rule, link); if (r < 0) return log_link_warning_errno(link, r, "Could not set routing policy rule: %m"); } if (link->routing_policy_rule_messages == 0) link->routing_policy_rules_configured = true; else { log_link_debug(link, "Setting routing policy rules"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } static const RoutingPolicyRule kernel_rules[] = { { .family = AF_INET, .priority = 0, .table = RT_TABLE_LOCAL, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, }, { .family = AF_INET, .priority = 32766, .table = RT_TABLE_MAIN, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, }, { .family = AF_INET, .priority = 32767, .table = RT_TABLE_DEFAULT, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, }, { .family = AF_INET6, .priority = 0, .table = RT_TABLE_LOCAL, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, }, { .family = AF_INET6, .priority = 32766, .table = RT_TABLE_MAIN, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, }, }; static bool routing_policy_rule_is_created_by_kernel(const RoutingPolicyRule *rule) { assert(rule); if (rule->l3mdev > 0) /* Currently, [RoutingPolicyRule] does not explicitly set FRA_L3MDEV. So, if the flag * is set, it is safe to treat the rule as created by kernel. */ return true; for (size_t i = 0; i < ELEMENTSOF(kernel_rules); i++) if (routing_policy_rule_equal(rule, &kernel_rules[i])) return true; return false; } int manager_rtnl_process_rule(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) { _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *tmp = NULL; RoutingPolicyRule *rule = NULL; const char *iif = NULL, *oif = NULL; bool adjust_protocol = false; uint32_t suppress_prefixlen; unsigned flags; uint16_t type; int r; assert(rtnl); assert(message); if (sd_netlink_message_is_error(message)) { r = sd_netlink_message_get_errno(message); if (r < 0) log_message_warning_errno(message, r, "rtnl: failed to receive rule message, ignoring"); return 0; } r = sd_netlink_message_get_type(message, &type); if (r < 0) { log_warning_errno(r, "rtnl: could not get message type, ignoring: %m"); return 0; } else if (!IN_SET(type, RTM_NEWRULE, RTM_DELRULE)) { log_warning("rtnl: received unexpected message type %u when processing rule, ignoring.", type); return 0; } r = routing_policy_rule_new(&tmp); if (r < 0) { log_oom(); return 0; } r = sd_rtnl_message_get_family(message, &tmp->family); if (r < 0) { log_warning_errno(r, "rtnl: could not get rule family, ignoring: %m"); return 0; } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) { log_debug("rtnl: received rule message with invalid family %d, ignoring.", tmp->family); return 0; } r = netlink_message_read_in_addr_union(message, FRA_SRC, tmp->family, &tmp->from); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_SRC attribute, ignoring: %m"); return 0; } else if (r >= 0) { r = sd_rtnl_message_routing_policy_rule_get_fib_src_prefixlen(message, &tmp->from_prefixlen); if (r < 0) { log_warning_errno(r, "rtnl: received rule message without valid source prefix length, ignoring: %m"); return 0; } } r = netlink_message_read_in_addr_union(message, FRA_DST, tmp->family, &tmp->to); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_DST attribute, ignoring: %m"); return 0; } else if (r >= 0) { r = sd_rtnl_message_routing_policy_rule_get_fib_dst_prefixlen(message, &tmp->to_prefixlen); if (r < 0) { log_warning_errno(r, "rtnl: received rule message without valid destination prefix length, ignoring: %m"); return 0; } } r = sd_rtnl_message_routing_policy_rule_get_flags(message, &flags); if (r < 0) { log_warning_errno(r, "rtnl: received rule message without valid flag, ignoring: %m"); return 0; } tmp->invert_rule = flags & FIB_RULE_INVERT; r = sd_netlink_message_read_u32(message, FRA_FWMARK, &tmp->fwmark); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_FWMARK attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, FRA_FWMASK, &tmp->fwmask); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_FWMASK attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, FRA_PRIORITY, &tmp->priority); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_PRIORITY attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, FRA_TABLE, &tmp->table); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_TABLE attribute, ignoring: %m"); return 0; } r = sd_rtnl_message_routing_policy_rule_get_tos(message, &tmp->tos); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FIB rule TOS, ignoring: %m"); return 0; } r = sd_rtnl_message_routing_policy_rule_get_fib_type(message, &tmp->type); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FIB rule type, ignoring: %m"); return 0; } r = sd_netlink_message_read_string(message, FRA_IIFNAME, &iif); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_IIFNAME attribute, ignoring: %m"); return 0; } r = free_and_strdup(&tmp->iif, iif); if (r < 0) return log_oom(); r = sd_netlink_message_read_string(message, FRA_OIFNAME, &oif); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_OIFNAME attribute, ignoring: %m"); return 0; } r = free_and_strdup(&tmp->oif, oif); if (r < 0) return log_oom(); r = sd_netlink_message_read_u8(message, FRA_IP_PROTO, &tmp->ipproto); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_IP_PROTO attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_u8(message, FRA_PROTOCOL, &tmp->protocol); if (r == -ENODATA) /* If FRA_PROTOCOL is supported by kernel, then the attribute is always appended. * When the received message does not have FRA_PROTOCOL, then we need to adjust the * protocol of the rule later. */ adjust_protocol = true; else if (r < 0) { log_warning_errno(r, "rtnl: could not get FRA_PROTOCOL attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_u8(message, FRA_L3MDEV, &tmp->l3mdev); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_L3MDEV attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read(message, FRA_SPORT_RANGE, sizeof(tmp->sport), &tmp->sport); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_SPORT_RANGE attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read(message, FRA_DPORT_RANGE, sizeof(tmp->dport), &tmp->dport); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_DPORT_RANGE attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read(message, FRA_UID_RANGE, sizeof(tmp->uid_range), &tmp->uid_range); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_UID_RANGE attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, FRA_SUPPRESS_PREFIXLEN, &suppress_prefixlen); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_SUPPRESS_PREFIXLEN attribute, ignoring: %m"); return 0; } if (r >= 0) tmp->suppress_prefixlen = (int) suppress_prefixlen; if (adjust_protocol) /* As .network files does not have setting to specify protocol, we can assume the * protocol of the received rule is RTPROT_KERNEL or RTPROT_STATIC. */ tmp->protocol = routing_policy_rule_is_created_by_kernel(tmp) ? RTPROT_KERNEL : RTPROT_STATIC; (void) routing_policy_rule_get(m, tmp, &rule); switch (type) { case RTM_NEWRULE: if (rule) log_routing_policy_rule_debug(tmp, tmp->family, "Received remembered", NULL); else { log_routing_policy_rule_debug(tmp, tmp->family, "Remembering foreign", NULL); r = routing_policy_rule_add_foreign(m, tmp, &rule); if (r < 0) { log_warning_errno(r, "Could not remember foreign rule, ignoring: %m"); return 0; } } break; case RTM_DELRULE: if (rule) { log_routing_policy_rule_debug(tmp, tmp->family, "Forgetting", NULL); routing_policy_rule_free(rule); } else log_routing_policy_rule_debug(tmp, tmp->family, "Kernel removed unknown", NULL); break; default: assert_not_reached("Received invalid RTNL message type"); } return 1; } static int parse_fwmark_fwmask(const char *s, uint32_t *ret_fwmark, uint32_t *ret_fwmask) { _cleanup_free_ char *fwmark_str = NULL; uint32_t fwmark, fwmask = 0; const char *slash; int r; assert(s); assert(ret_fwmark); assert(ret_fwmask); slash = strchr(s, '/'); if (slash) { fwmark_str = strndup(s, slash - s); if (!fwmark_str) return -ENOMEM; } r = safe_atou32(fwmark_str ?: s, &fwmark); if (r < 0) return r; if (fwmark > 0) { if (slash) { r = safe_atou32(slash + 1, &fwmask); if (r < 0) return r; } else fwmask = UINT32_MAX; } *ret_fwmark = fwmark; *ret_fwmask = fwmask; return 0; } int config_parse_routing_policy_rule_tos( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = safe_atou8(rvalue, &n->tos); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse RPDB rule TOS, ignoring: %s", rvalue); return 0; } n = NULL; return 0; } int config_parse_routing_policy_rule_priority( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = safe_atou32(rvalue, &n->priority); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse RPDB rule priority, ignoring: %s", rvalue); return 0; } n = NULL; return 0; } int config_parse_routing_policy_rule_table( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = safe_atou32(rvalue, &n->table); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse RPDB rule table, ignoring: %s", rvalue); return 0; } n = NULL; return 0; } int config_parse_routing_policy_rule_fwmark_mask( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = parse_fwmark_fwmask(rvalue, &n->fwmark, &n->fwmask); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse RPDB rule firewall mark or mask, ignoring: %s", rvalue); return 0; } n = NULL; return 0; } int config_parse_routing_policy_rule_prefix( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; union in_addr_union *buffer; uint8_t *prefixlen; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); if (streq(lvalue, "To")) { buffer = &n->to; prefixlen = &n->to_prefixlen; } else { buffer = &n->from; prefixlen = &n->from_prefixlen; } if (n->family == AF_UNSPEC) r = in_addr_prefix_from_string_auto(rvalue, &n->family, buffer, prefixlen); else r = in_addr_prefix_from_string(rvalue, n->family, buffer, prefixlen); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "RPDB rule prefix is invalid, ignoring assignment: %s", rvalue); return 0; } n = NULL; return 0; } int config_parse_routing_policy_rule_device( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); if (!ifname_valid(rvalue)) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Failed to parse '%s' interface name, ignoring: %s", lvalue, rvalue); return 0; } if (streq(lvalue, "IncomingInterface")) { r = free_and_strdup(&n->iif, rvalue); if (r < 0) return log_oom(); } else { r = free_and_strdup(&n->oif, rvalue); if (r < 0) return log_oom(); } n = NULL; return 0; } int config_parse_routing_policy_rule_port_range( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; uint16_t low, high; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = parse_ip_port_range(rvalue, &low, &high); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse routing policy rule port range '%s'", rvalue); return 0; } if (streq(lvalue, "SourcePort")) { n->sport.start = low; n->sport.end = high; } else { n->dport.start = low; n->dport.end = high; } n = NULL; return 0; } int config_parse_routing_policy_rule_ip_protocol( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = parse_ip_protocol(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse IP protocol '%s' for routing policy rule, ignoring: %m", rvalue); return 0; } n->ipproto = r; n = NULL; return 0; } int config_parse_routing_policy_rule_invert( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = parse_boolean(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse RPDB rule invert, ignoring: %s", rvalue); return 0; } n->invert_rule = r; n = NULL; return 0; } int config_parse_routing_policy_rule_family( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; AddressFamily a; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); a = routing_policy_rule_address_family_from_string(rvalue); if (a < 0) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid address family '%s', ignoring.", rvalue); return 0; } n->address_family = a; n = NULL; return 0; } int config_parse_routing_policy_rule_uid_range( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; uid_t start, end; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = get_user_creds(&rvalue, &start, NULL, NULL, NULL, 0); if (r >= 0) end = start; else { r = parse_uid_range(rvalue, &start, &end); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid uid or uid range '%s', ignoring: %m", rvalue); return 0; } } n->uid_range.start = start; n->uid_range.end = end; n = NULL; return 0; } int config_parse_routing_policy_rule_suppress_prefixlen( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); r = parse_ip_prefix_length(rvalue, &n->suppress_prefixlen); if (r == -ERANGE) { log_syntax(unit, LOG_WARNING, filename, line, r, "Prefix length outside of valid range 0-128, ignoring: %s", rvalue); return 0; } if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse RPDB rule suppress_prefixlen, ignoring: %s", rvalue); return 0; } n = NULL; return 0; } int config_parse_routing_policy_rule_type( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL; Network *network = userdata; int r, t; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = routing_policy_rule_new_static(network, filename, section_line, &n); if (r < 0) return log_oom(); t = fr_act_type_from_string(rvalue); if (t < 0) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Could not parse FIB rule type \"%s\", ignoring assignment: %m", rvalue); return 0; } n->type = (uint8_t) t; n = NULL; return 0; } static int routing_policy_rule_section_verify(RoutingPolicyRule *rule) { if (section_is_invalid(rule->section)) return -EINVAL; if ((rule->family == AF_INET && FLAGS_SET(rule->address_family, ADDRESS_FAMILY_IPV6)) || (rule->family == AF_INET6 && FLAGS_SET(rule->address_family, ADDRESS_FAMILY_IPV4))) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "%s: address family specified by Family= conflicts with the address " "specified by To= or From=. Ignoring [RoutingPolicyRule] section from line %u.", rule->section->filename, rule->section->line); if (rule->family == AF_UNSPEC && rule->address_family == ADDRESS_FAMILY_NO) rule->family = AF_INET; /* Currently, [RoutingPolicyRule] does not have a setting to set FRA_L3MDEV flag. Please also * update routing_policy_rule_is_created_by_kernel() when a new setting which sets the flag is * added in the future. */ if (rule->l3mdev > 0) assert_not_reached("FRA_L3MDEV flag should not be configured."); return 0; } void network_drop_invalid_routing_policy_rules(Network *network) { RoutingPolicyRule *rule; assert(network); HASHMAP_FOREACH(rule, network->rules_by_section) if (routing_policy_rule_section_verify(rule) < 0) routing_policy_rule_free(rule); }