/* 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 "hashmap.h" #include "ip-protocol-list.h" #include "netlink-util.h" #include "networkd-manager.h" #include "networkd-queue.h" #include "networkd-route-util.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", }; static const char *const fr_act_type_full_table[__FR_ACT_MAX] = { [FR_ACT_TO_TBL] = "table", [FR_ACT_GOTO] = "goto", [FR_ACT_NOP] = "nop", [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); DEFINE_STRING_TABLE_LOOKUP_TO_STRING(fr_act_type_full, 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); config_section_free(rule->section); free(rule->iif); free(rule->oif); return mfree(rule); } DEFINE_SECTION_CLEANUP_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, .suppress_ifgroup = -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_(config_section_freep) ConfigSection *n = NULL; int r; assert(network); assert(ret); assert(filename); assert(section_line > 0); r = 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->source = NETWORK_CONFIG_SOURCE_STATIC; rule->protocol = RTPROT_STATIC; r = hashmap_ensure_put(&network->rules_by_section, &config_section_hash_ops, rule->section, rule); if (r < 0) return r; *ret = TAKE_PTR(rule); return 0; } static int routing_policy_rule_dup(const RoutingPolicyRule *src, RoutingPolicyRule **ret) { _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *dest = NULL; assert(src); assert(ret); dest = newdup(RoutingPolicyRule, src, 1); if (!dest) return -ENOMEM; /* Unset all pointers */ dest->manager = NULL; dest->network = NULL; dest->section = NULL; dest->iif = dest->oif = NULL; if (src->iif) { dest->iif = strdup(src->iif); if (!dest->iif) return -ENOMEM; } if (src->oif) { dest->oif = strdup(src->oif); if (!dest->oif) return -ENOMEM; } *ret = TAKE_PTR(dest); 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->suppress_ifgroup, sizeof(rule->suppress_ifgroup), 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->suppress_ifgroup, b->suppress_ifgroup); 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 *in, RoutingPolicyRule **ret) { RoutingPolicyRule *rule; assert(m); assert(in); rule = set_get(m->rules, in); if (rule) { if (ret) *ret = rule; return 0; } if (in->priority_set) return -ENOENT; /* Also find rules configured without priority. */ SET_FOREACH(rule, m->rules) { uint32_t priority; bool found; if (rule->priority_set) /* The rule is configured with priority. */ continue; priority = rule->priority; rule->priority = 0; found = routing_policy_rule_equal(rule, in); rule->priority = priority; if (found) { if (ret) *ret = rule; return 0; } } return -ENOENT; } static int routing_policy_rule_add(Manager *m, RoutingPolicyRule *rule) { int r; assert(m); assert(rule); assert(IN_SET(rule->family, AF_INET, AF_INET6)); r = set_ensure_put(&m->rules, &routing_policy_rule_hash_ops, rule); if (r < 0) return r; if (r == 0) return -EEXIST; rule->manager = m; return 0; } static int routing_policy_rule_acquire_priority(Manager *manager, RoutingPolicyRule *rule) { _cleanup_set_free_ Set *priorities = NULL; RoutingPolicyRule *tmp; uint32_t priority; Network *network; int r; assert(manager); assert(rule); assert(IN_SET(rule->family, AF_INET, AF_INET6)); if (rule->priority_set) return 0; /* Find the highest unused priority. Note that 32766 is already used by kernel. * See kernel_rules[] below. */ SET_FOREACH(tmp, manager->rules) { if (tmp->family != rule->family) continue; if (tmp->priority == 0 || tmp->priority > 32765) continue; r = set_ensure_put(&priorities, NULL, UINT32_TO_PTR(tmp->priority)); if (r < 0) return r; } ORDERED_HASHMAP_FOREACH(network, manager->networks) HASHMAP_FOREACH(tmp, network->rules_by_section) { if (tmp->family != AF_UNSPEC && tmp->family != rule->family) continue; if (!tmp->priority_set) continue; if (tmp->priority == 0 || tmp->priority > 32765) continue; r = set_ensure_put(&priorities, NULL, UINT32_TO_PTR(tmp->priority)); if (r < 0) return r; } for (priority = 32765; priority > 0; priority--) if (!set_contains(priorities, UINT32_TO_PTR(priority))) break; rule->priority = priority; return 0; } static void log_routing_policy_rule_debug(const RoutingPolicyRule *rule, const char *str, const Link *link, const Manager *m) { _cleanup_free_ char *state = NULL, *from = NULL, *to = NULL, *table = NULL; assert(rule); assert(IN_SET(rule->family, AF_INET, AF_INET6)); assert(str); assert(m); /* link may be NULL. */ if (!DEBUG_LOGGING) return; (void) network_config_state_to_string_alloc(rule->state, &state); (void) in_addr_prefix_to_string(rule->family, &rule->from, rule->from_prefixlen, &from); (void) in_addr_prefix_to_string(rule->family, &rule->to, rule->to_prefixlen, &to); (void) manager_get_route_table_to_string(m, rule->table, &table); log_link_debug(link, "%s %s routing policy rule (%s): priority: %"PRIu32", %s -> %s, iif: %s, oif: %s, table: %s", str, strna(network_config_source_to_string(rule->source)), strna(state), rule->priority, strna(from), strna(to), strna(rule->iif), strna(rule->oif), strna(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 (rule->from_prefixlen > 0) { r = netlink_message_append_in_addr_union(m, FRA_SRC, rule->family, &rule->from); if (r < 0) return r; r = sd_rtnl_message_routing_policy_rule_set_fib_src_prefixlen(m, rule->from_prefixlen); if (r < 0) return r; } if (rule->to_prefixlen > 0) { r = netlink_message_append_in_addr_union(m, FRA_DST, rule->family, &rule->to); if (r < 0) return r; r = sd_rtnl_message_routing_policy_rule_set_fib_dst_prefixlen(m, rule->to_prefixlen); if (r < 0) return r; } r = sd_netlink_message_append_u32(m, FRA_PRIORITY, rule->priority); if (r < 0) return r; if (rule->tos > 0) { r = sd_rtnl_message_routing_policy_rule_set_tos(m, rule->tos); if (r < 0) return r; } if (rule->table < 256) { r = sd_rtnl_message_routing_policy_rule_set_table(m, rule->table); if (r < 0) return r; } else { r = sd_rtnl_message_routing_policy_rule_set_table(m, RT_TABLE_UNSPEC); if (r < 0) return r; r = sd_netlink_message_append_u32(m, FRA_TABLE, rule->table); if (r < 0) return r; } if (rule->fwmark > 0) { r = sd_netlink_message_append_u32(m, FRA_FWMARK, rule->fwmark); if (r < 0) return r; r = sd_netlink_message_append_u32(m, FRA_FWMASK, rule->fwmask); if (r < 0) return r; } if (rule->iif) { r = sd_netlink_message_append_string(m, FRA_IIFNAME, rule->iif); if (r < 0) return r; } if (rule->oif) { r = sd_netlink_message_append_string(m, FRA_OIFNAME, rule->oif); if (r < 0) return r; } r = sd_netlink_message_append_u8(m, FRA_IP_PROTO, rule->ipproto); if (r < 0) return r; r = sd_netlink_message_append_u8(m, FRA_PROTOCOL, rule->protocol); if (r < 0) return r; 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 r; } 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 r; } 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 r; } if (rule->invert_rule) { r = sd_rtnl_message_routing_policy_rule_set_flags(m, FIB_RULE_INVERT); if (r < 0) return r; } if (rule->suppress_prefixlen >= 0) { r = sd_netlink_message_append_u32(m, FRA_SUPPRESS_PREFIXLEN, (uint32_t) rule->suppress_prefixlen); if (r < 0) return r; } if (rule->suppress_ifgroup >= 0) { r = sd_netlink_message_append_u32(m, FRA_SUPPRESS_IFGROUP, (uint32_t) rule->suppress_ifgroup); if (r < 0) return r; } r = sd_rtnl_message_routing_policy_rule_set_fib_type(m, rule->type); if (r < 0) return r; 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(RoutingPolicyRule *rule) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; int r; assert(rule); assert(rule->manager); assert(rule->manager->rtnl); assert(IN_SET(rule->family, AF_INET, AF_INET6)); log_routing_policy_rule_debug(rule, "Removing", NULL, rule->manager); r = sd_rtnl_message_new_routing_policy_rule(rule->manager->rtnl, &m, RTM_DELRULE, rule->family); if (r < 0) return log_warning_errno(r, "Could not allocate netlink message: %m"); r = routing_policy_rule_set_netlink_message(rule, m, NULL); if (r < 0) return log_warning_errno(r, "Could not create netlink message: %m"); r = netlink_call_async(rule->manager->rtnl, NULL, m, routing_policy_rule_remove_handler, NULL, NULL); if (r < 0) return log_warning_errno(r, "Could not send netlink message: %m"); routing_policy_rule_enter_removing(rule); return 0; } static int routing_policy_rule_configure(RoutingPolicyRule *rule, Link *link, Request *req) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; int r; assert(rule); assert(IN_SET(rule->family, AF_INET, AF_INET6)); assert(link); assert(link->ifindex > 0); assert(link->manager); assert(link->manager->rtnl); assert(req); log_routing_policy_rule_debug(rule, "Configuring", link, link->manager); r = sd_rtnl_message_new_routing_policy_rule(link->manager->rtnl, &m, RTM_NEWRULE, rule->family); if (r < 0) return r; r = routing_policy_rule_set_netlink_message(rule, m, link); if (r < 0) return r; return request_call_netlink_async(link->manager->rtnl, m, req); } static void manager_mark_routing_policy_rules(Manager *m, bool foreign, const Link *except) { RoutingPolicyRule *rule; Link *link; assert(m); /* First, mark all existing rules. */ SET_FOREACH(rule, m->rules) { /* Do not touch rules managed by kernel. */ if (rule->protocol == RTPROT_KERNEL) continue; /* When 'foreign' is true, mark only foreign rules, and vice versa. */ if (foreign != (rule->source == NETWORK_CONFIG_SOURCE_FOREIGN)) continue; /* Ignore rules not assigned yet or already removing. */ if (!routing_policy_rule_exists(rule)) continue; routing_policy_rule_mark(rule); } /* Then, unmark all rules requested by active links. */ HASHMAP_FOREACH(link, m->links_by_index) { if (link == except) continue; if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) continue; HASHMAP_FOREACH(rule, link->network->rules_by_section) { RoutingPolicyRule *existing; if (IN_SET(rule->family, AF_INET, AF_INET6)) { if (routing_policy_rule_get(m, rule, &existing) >= 0) routing_policy_rule_unmark(existing); } else { /* The case Family=both. */ rule->family = AF_INET; if (routing_policy_rule_get(m, rule, &existing) >= 0) routing_policy_rule_unmark(existing); rule->family = AF_INET6; if (routing_policy_rule_get(m, rule, &existing) >= 0) routing_policy_rule_unmark(existing); rule->family = AF_UNSPEC; } } } } int manager_drop_routing_policy_rules_internal(Manager *m, bool foreign, const Link *except) { RoutingPolicyRule *rule; int k, r = 0; assert(m); manager_mark_routing_policy_rules(m, foreign, except); SET_FOREACH(rule, m->rules) { if (!routing_policy_rule_is_marked(rule)) continue; k = routing_policy_rule_remove(rule); if (k < 0 && r >= 0) r = k; } return r; } void link_foreignize_routing_policy_rules(Link *link) { RoutingPolicyRule *rule; assert(link); assert(link->manager); manager_mark_routing_policy_rules(link->manager, /* foreign = */ false, link); SET_FOREACH(rule, link->manager->rules) { if (!routing_policy_rule_is_marked(rule)) continue; rule->source = NETWORK_CONFIG_SOURCE_FOREIGN; } } static int routing_policy_rule_process_request(Request *req, Link *link, RoutingPolicyRule *rule) { int r; assert(req); assert(link); assert(rule); if (!link_is_ready_to_configure(link, false)) return 0; r = routing_policy_rule_configure(rule, link, req); if (r < 0) return log_link_warning_errno(link, r, "Failed to configure routing policy rule: %m"); routing_policy_rule_enter_configuring(rule); return 1; } static int static_routing_policy_rule_configure_handler( sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, RoutingPolicyRule *rule) { int r; assert(m); assert(link); 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->static_routing_policy_rule_messages == 0) { log_link_debug(link, "Routing policy rule configured"); link->static_routing_policy_rules_configured = true; link_check_ready(link); } return 1; } static int link_request_routing_policy_rule(Link *link, RoutingPolicyRule *rule) { RoutingPolicyRule *existing; int r; assert(link); assert(link->manager); assert(rule); assert(rule->source != NETWORK_CONFIG_SOURCE_FOREIGN); if (routing_policy_rule_get(link->manager, rule, &existing) < 0) { _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *tmp = NULL; r = routing_policy_rule_dup(rule, &tmp); if (r < 0) return r; r = routing_policy_rule_acquire_priority(link->manager, tmp); if (r < 0) return r; r = routing_policy_rule_add(link->manager, tmp); if (r < 0) return r; existing = TAKE_PTR(tmp); } else existing->source = rule->source; log_routing_policy_rule_debug(existing, "Requesting", link, link->manager); r = link_queue_request_safe(link, REQUEST_TYPE_ROUTING_POLICY_RULE, existing, NULL, routing_policy_rule_hash_func, routing_policy_rule_compare_func, routing_policy_rule_process_request, &link->static_routing_policy_rule_messages, static_routing_policy_rule_configure_handler, NULL); if (r <= 0) return r; routing_policy_rule_enter_requesting(existing); return 1; } static int link_request_static_routing_policy_rule(Link *link, RoutingPolicyRule *rule) { int r; if (IN_SET(rule->family, AF_INET, AF_INET6)) return link_request_routing_policy_rule(link, rule); rule->family = AF_INET; r = link_request_routing_policy_rule(link, rule); if (r < 0) { rule->family = AF_UNSPEC; return r; } rule->family = AF_INET6; r = link_request_routing_policy_rule(link, rule); rule->family = AF_UNSPEC; return r; } int link_request_static_routing_policy_rules(Link *link) { RoutingPolicyRule *rule; int r; assert(link); assert(link->network); link->static_routing_policy_rules_configured = false; HASHMAP_FOREACH(rule, link->network->rules_by_section) { r = link_request_static_routing_policy_rule(link, rule); if (r < 0) return log_link_warning_errno(link, r, "Could not request routing policy rule: %m"); } if (link->static_routing_policy_rule_messages == 0) { link->static_routing_policy_rules_configured = true; link_check_ready(link); } else { log_link_debug(link, "Requesting routing policy rules"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } static const RoutingPolicyRule kernel_rules[] = { { .family = AF_INET, .priority_set = true, .priority = 0, .table = RT_TABLE_LOCAL, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, .suppress_ifgroup = -1, }, { .family = AF_INET, .priority_set = true, .priority = 32766, .table = RT_TABLE_MAIN, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, .suppress_ifgroup = -1, }, { .family = AF_INET, .priority_set = true, .priority = 32767, .table = RT_TABLE_DEFAULT, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, .suppress_ifgroup = -1, }, { .family = AF_INET6, .priority_set = true, .priority = 0, .table = RT_TABLE_LOCAL, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, .suppress_ifgroup = -1, }, { .family = AF_INET6, .priority_set = true, .priority = 32766, .table = RT_TABLE_MAIN, .type = FR_ACT_TO_TBL, .uid_range.start = UID_INVALID, .uid_range.end = UID_INVALID, .suppress_prefixlen = -1, .suppress_ifgroup = -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; bool adjust_protocol = false; 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; } } unsigned flags; 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; } /* The kernel does not send priority if priority is zero. So, the flag below must be always set * even if the message does not contain FRA_PRIORITY. */ tmp->priority_set = true; 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_strdup(message, FRA_IIFNAME, &tmp->iif); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_IIFNAME attribute, ignoring: %m"); return 0; } r = sd_netlink_message_read_string_strdup(message, FRA_OIFNAME, &tmp->oif); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_OIFNAME attribute, ignoring: %m"); return 0; } 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; } uint32_t suppress_prefixlen; 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 = (int32_t) suppress_prefixlen; uint32_t suppress_ifgroup; r = sd_netlink_message_read_u32(message, FRA_SUPPRESS_IFGROUP, &suppress_ifgroup); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get FRA_SUPPRESS_IFGROUP attribute, ignoring: %m"); return 0; } if (r >= 0) tmp->suppress_ifgroup = (int32_t) suppress_ifgroup; 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) { routing_policy_rule_enter_configured(rule); log_routing_policy_rule_debug(rule, "Received remembered", NULL, m); } else if (!m->manage_foreign_rules) { routing_policy_rule_enter_configured(tmp); log_routing_policy_rule_debug(tmp, "Ignoring received", NULL, m); } else { routing_policy_rule_enter_configured(tmp); log_routing_policy_rule_debug(tmp, "Remembering", NULL, m); r = routing_policy_rule_add(m, tmp); if (r < 0) { log_warning_errno(r, "Could not remember foreign rule, ignoring: %m"); return 0; } TAKE_PTR(tmp); } break; case RTM_DELRULE: if (rule) { routing_policy_rule_enter_removed(rule); if (rule->state == 0) { log_routing_policy_rule_debug(rule, "Forgetting", NULL, m); routing_policy_rule_free(rule); } else log_routing_policy_rule_debug(rule, "Removed", NULL, m); } else log_routing_policy_rule_debug(tmp, "Kernel removed unknown", NULL, m); break; default: assert_not_reached(); } 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; } TAKE_PTR(n); 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(); if (isempty(rvalue)) { n->priority = 0; n->priority_set = false; TAKE_PTR(n); return 0; } 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->priority_set = true; TAKE_PTR(n); 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 = manager_get_route_table_from_string(network->manager, rvalue, &n->table); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse RPDB rule route table number \"%s\", ignoring assignment: %m", rvalue); return 0; } TAKE_PTR(n); 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; } TAKE_PTR(n); 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; } TAKE_PTR(n); 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, "Invalid interface name '%s' in %s=, ignoring assignment.", rvalue, lvalue); return 0; } r = free_and_strdup(streq(lvalue, "IncomingInterface") ? &n->iif : &n->oif, rvalue); if (r < 0) return log_oom(); TAKE_PTR(n); 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; } TAKE_PTR(n); 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; TAKE_PTR(n); 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; TAKE_PTR(n); 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, a, "Invalid address family '%s', ignoring.", rvalue); return 0; } n->address_family = a; TAKE_PTR(n); 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; TAKE_PTR(n); 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; } TAKE_PTR(n); return 0; } int config_parse_routing_policy_rule_suppress_ifgroup( 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; int32_t suppress_ifgroup; 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 (isempty(rvalue)) { n->suppress_ifgroup = -1; return 0; } r = safe_atoi32(rvalue, &suppress_ifgroup); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse SuppressInterfaceGroup=, ignoring assignment: %s", rvalue); return 0; } if (suppress_ifgroup < 0) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Value of SuppressInterfaceGroup= must be in the range 0…2147483647, ignoring assignment: %s", rvalue); return 0; } n->suppress_ifgroup = suppress_ifgroup; TAKE_PTR(n); 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, t, "Could not parse FIB rule type \"%s\", ignoring assignment: %m", rvalue); return 0; } n->type = (uint8_t) t; TAKE_PTR(n); 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) { if (IN_SET(rule->address_family, ADDRESS_FAMILY_IPV4, ADDRESS_FAMILY_NO)) rule->family = AF_INET; else if (rule->address_family == ADDRESS_FAMILY_IPV6) rule->family = AF_INET6; /* rule->family can be AF_UNSPEC only when Family=both. */ } /* 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(); 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); }