+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <net/if.h>
-
-#include "sd-network.h"
-#include "strv.h"
-#include "missing.h"
-#include "resolved-link.h"
-
-int link_new(Manager *m, Link **ret, int ifindex) {
- _cleanup_(link_freep) Link *l = NULL;
- int r;
-
- assert(m);
- assert(ifindex > 0);
-
- r = hashmap_ensure_allocated(&m->links, NULL);
- if (r < 0)
- return r;
-
- l = new0(Link, 1);
- if (!l)
- return -ENOMEM;
-
- l->ifindex = ifindex;
- l->llmnr_support = SUPPORT_YES;
-
- r = hashmap_put(m->links, INT_TO_PTR(ifindex), l);
- if (r < 0)
- return r;
-
- l->manager = m;
-
- if (ret)
- *ret = l;
- l = NULL;
-
- return 0;
-}
-
-Link *link_free(Link *l) {
-
- if (!l)
- return NULL;
-
- while (l->addresses)
- link_address_free(l->addresses);
-
- if (l->manager)
- hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));
-
- dns_scope_free(l->unicast_scope);
- dns_scope_free(l->llmnr_ipv4_scope);
- dns_scope_free(l->llmnr_ipv6_scope);
-
- while (l->dns_servers)
- dns_server_free(l->dns_servers);
-
- free(l);
- return NULL;
-}
-
-static void link_allocate_scopes(Link *l) {
- int r;
-
- assert(l);
-
- if (l->dns_servers) {
- if (!l->unicast_scope) {
- r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC);
- if (r < 0)
- log_warning_errno(r, "Failed to allocate DNS scope: %m");
- }
- } else
- l->unicast_scope = dns_scope_free(l->unicast_scope);
-
- if (link_relevant(l, AF_INET) &&
- l->llmnr_support != SUPPORT_NO &&
- l->manager->llmnr_support != SUPPORT_NO) {
- if (!l->llmnr_ipv4_scope) {
- r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET);
- if (r < 0)
- log_warning_errno(r, "Failed to allocate LLMNR IPv4 scope: %m");
- }
- } else
- l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope);
-
- if (link_relevant(l, AF_INET6) &&
- l->llmnr_support != SUPPORT_NO &&
- l->manager->llmnr_support != SUPPORT_NO &&
- socket_ipv6_is_supported()) {
- if (!l->llmnr_ipv6_scope) {
- r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6);
- if (r < 0)
- log_warning_errno(r, "Failed to allocate LLMNR IPv6 scope: %m");
- }
- } else
- l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope);
-}
-
-void link_add_rrs(Link *l, bool force_remove) {
- LinkAddress *a;
-
- LIST_FOREACH(addresses, a, l->addresses)
- link_address_add_rrs(a, force_remove);
-}
-
-int link_update_rtnl(Link *l, sd_rtnl_message *m) {
- const char *n = NULL;
- int r;
-
- assert(l);
- assert(m);
-
- r = sd_rtnl_message_link_get_flags(m, &l->flags);
- if (r < 0)
- return r;
-
- sd_rtnl_message_read_u32(m, IFLA_MTU, &l->mtu);
-
- if (sd_rtnl_message_read_string(m, IFLA_IFNAME, &n) >= 0) {
- strncpy(l->name, n, sizeof(l->name)-1);
- char_array_0(l->name);
- }
-
- link_allocate_scopes(l);
- link_add_rrs(l, false);
-
- return 0;
-}
-
-static int link_update_dns_servers(Link *l) {
- _cleanup_strv_free_ char **nameservers = NULL;
- char **nameserver;
- DnsServer *s, *nx;
- int r;
-
- assert(l);
-
- r = sd_network_link_get_dns(l->ifindex, &nameservers);
- if (r < 0)
- goto clear;
-
- LIST_FOREACH(servers, s, l->dns_servers)
- s->marked = true;
-
- STRV_FOREACH(nameserver, nameservers) {
- union in_addr_union a;
- int family;
-
- r = in_addr_from_string_auto(*nameserver, &family, &a);
- if (r < 0)
- goto clear;
-
- s = link_find_dns_server(l, family, &a);
- if (s)
- s->marked = false;
- else {
- r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, family, &a);
- if (r < 0)
- goto clear;
- }
- }
-
- LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers)
- if (s->marked)
- dns_server_free(s);
-
- return 0;
-
-clear:
- while (l->dns_servers)
- dns_server_free(l->dns_servers);
-
- return r;
-}
-
-static int link_update_llmnr_support(Link *l) {
- _cleanup_free_ char *b = NULL;
- int r;
-
- assert(l);
-
- r = sd_network_link_get_llmnr(l->ifindex, &b);
- if (r < 0)
- goto clear;
-
- r = parse_boolean(b);
- if (r < 0) {
- if (streq(b, "resolve"))
- l->llmnr_support = SUPPORT_RESOLVE;
- else
- goto clear;
-
- } else if (r > 0)
- l->llmnr_support = SUPPORT_YES;
- else
- l->llmnr_support = SUPPORT_NO;
-
- return 0;
-
-clear:
- l->llmnr_support = SUPPORT_YES;
- return r;
-}
-
-static int link_update_domains(Link *l) {
- int r;
-
- if (!l->unicast_scope)
- return 0;
-
- strv_free(l->unicast_scope->domains);
- l->unicast_scope->domains = NULL;
-
- r = sd_network_link_get_domains(l->ifindex,
- &l->unicast_scope->domains);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int link_update_monitor(Link *l) {
- assert(l);
-
- link_update_dns_servers(l);
- link_update_llmnr_support(l);
- link_allocate_scopes(l);
- link_update_domains(l);
- link_add_rrs(l, false);
-
- return 0;
-}
-
-bool link_relevant(Link *l, int family) {
- _cleanup_free_ char *state = NULL;
- LinkAddress *a;
-
- assert(l);
-
- /* A link is relevant if it isn't a loopback or pointopoint
- * device, has a link beat, can do multicast and has at least
- * one relevant IP address */
-
- if (l->flags & (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_DORMANT))
- return false;
-
- if ((l->flags & (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST)) != (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST))
- return false;
-
- sd_network_link_get_operational_state(l->ifindex, &state);
- if (state && !STR_IN_SET(state, "unknown", "degraded", "routable"))
- return false;
-
- LIST_FOREACH(addresses, a, l->addresses)
- if (a->family == family && link_address_relevant(a))
- return true;
-
- return false;
-}
-
-LinkAddress *link_find_address(Link *l, int family, const union in_addr_union *in_addr) {
- LinkAddress *a;
-
- assert(l);
-
- LIST_FOREACH(addresses, a, l->addresses)
- if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr))
- return a;
-
- return NULL;
-}
-
-DnsServer* link_find_dns_server(Link *l, int family, const union in_addr_union *in_addr) {
- DnsServer *s;
-
- assert(l);
-
- LIST_FOREACH(servers, s, l->dns_servers)
- if (s->family == family && in_addr_equal(family, &s->address, in_addr))
- return s;
- return NULL;
-}
-
-DnsServer* link_set_dns_server(Link *l, DnsServer *s) {
- assert(l);
-
- if (l->current_dns_server == s)
- return s;
-
- if (s) {
- _cleanup_free_ char *ip = NULL;
-
- in_addr_to_string(s->family, &s->address, &ip);
- log_info("Switching to DNS server %s for interface %s.", strna(ip), l->name);
- }
-
- l->current_dns_server = s;
-
- if (l->unicast_scope)
- dns_cache_flush(&l->unicast_scope->cache);
-
- return s;
-}
-
-DnsServer *link_get_dns_server(Link *l) {
- assert(l);
-
- if (!l->current_dns_server)
- link_set_dns_server(l, l->dns_servers);
-
- return l->current_dns_server;
-}
-
-void link_next_dns_server(Link *l) {
- assert(l);
-
- if (!l->current_dns_server)
- return;
-
- if (l->current_dns_server->servers_next) {
- link_set_dns_server(l, l->current_dns_server->servers_next);
- return;
- }
-
- link_set_dns_server(l, l->dns_servers);
-}
-
-int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr) {
- LinkAddress *a;
-
- assert(l);
- assert(in_addr);
-
- a = new0(LinkAddress, 1);
- if (!a)
- return -ENOMEM;
-
- a->family = family;
- a->in_addr = *in_addr;
-
- a->link = l;
- LIST_PREPEND(addresses, l->addresses, a);
-
- if (ret)
- *ret = a;
-
- return 0;
-}
-
-LinkAddress *link_address_free(LinkAddress *a) {
- if (!a)
- return NULL;
-
- if (a->link) {
- LIST_REMOVE(addresses, a->link->addresses, a);
-
- if (a->llmnr_address_rr) {
- if (a->family == AF_INET && a->link->llmnr_ipv4_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr);
- else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr);
- }
-
- if (a->llmnr_ptr_rr) {
- if (a->family == AF_INET && a->link->llmnr_ipv4_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr);
- else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr);
- }
- }
-
- dns_resource_record_unref(a->llmnr_address_rr);
- dns_resource_record_unref(a->llmnr_ptr_rr);
-
- free(a);
- return NULL;
-}
-
-void link_address_add_rrs(LinkAddress *a, bool force_remove) {
- int r;
-
- assert(a);
-
- if (a->family == AF_INET) {
-
- if (!force_remove &&
- link_address_relevant(a) &&
- a->link->llmnr_ipv4_scope &&
- a->link->llmnr_support == SUPPORT_YES &&
- a->link->manager->llmnr_support == SUPPORT_YES) {
-
- if (!a->link->manager->host_ipv4_key) {
- a->link->manager->host_ipv4_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, a->link->manager->hostname);
- if (!a->link->manager->host_ipv4_key) {
- r = -ENOMEM;
- goto fail;
- }
- }
-
- if (!a->llmnr_address_rr) {
- a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv4_key);
- if (!a->llmnr_address_rr) {
- r = -ENOMEM;
- goto fail;
- }
-
- a->llmnr_address_rr->a.in_addr = a->in_addr.in;
- a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL;
- }
-
- if (!a->llmnr_ptr_rr) {
- r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname);
- if (r < 0)
- goto fail;
-
- a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL;
- }
-
- r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_address_rr, true);
- if (r < 0)
- log_warning_errno(r, "Failed to add A record to LLMNR zone: %m");
-
- r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_ptr_rr, false);
- if (r < 0)
- log_warning_errno(r, "Failed to add IPv6 PTR record to LLMNR zone: %m");
- } else {
- if (a->llmnr_address_rr) {
- if (a->link->llmnr_ipv4_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr);
- a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr);
- }
-
- if (a->llmnr_ptr_rr) {
- if (a->link->llmnr_ipv4_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr);
- a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr);
- }
- }
- }
-
- if (a->family == AF_INET6) {
-
- if (!force_remove &&
- link_address_relevant(a) &&
- a->link->llmnr_ipv6_scope &&
- a->link->llmnr_support == SUPPORT_YES &&
- a->link->manager->llmnr_support == SUPPORT_YES) {
-
- if (!a->link->manager->host_ipv6_key) {
- a->link->manager->host_ipv6_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, a->link->manager->hostname);
- if (!a->link->manager->host_ipv6_key) {
- r = -ENOMEM;
- goto fail;
- }
- }
-
- if (!a->llmnr_address_rr) {
- a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv6_key);
- if (!a->llmnr_address_rr) {
- r = -ENOMEM;
- goto fail;
- }
-
- a->llmnr_address_rr->aaaa.in6_addr = a->in_addr.in6;
- a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL;
- }
-
- if (!a->llmnr_ptr_rr) {
- r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname);
- if (r < 0)
- goto fail;
-
- a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL;
- }
-
- r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_address_rr, true);
- if (r < 0)
- log_warning_errno(r, "Failed to add AAAA record to LLMNR zone: %m");
-
- r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_ptr_rr, false);
- if (r < 0)
- log_warning_errno(r, "Failed to add IPv6 PTR record to LLMNR zone: %m");
- } else {
- if (a->llmnr_address_rr) {
- if (a->link->llmnr_ipv6_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr);
- a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr);
- }
-
- if (a->llmnr_ptr_rr) {
- if (a->link->llmnr_ipv6_scope)
- dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr);
- a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr);
- }
- }
- }
-
- return;
-
-fail:
- log_debug_errno(r, "Failed to update address RRs: %m");
-}
-
-int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) {
- int r;
- assert(a);
- assert(m);
-
- r = sd_rtnl_message_addr_get_flags(m, &a->flags);
- if (r < 0)
- return r;
-
- sd_rtnl_message_addr_get_scope(m, &a->scope);
-
- link_allocate_scopes(a->link);
- link_add_rrs(a->link, false);
-
- return 0;
-}
-
-bool link_address_relevant(LinkAddress *a) {
- assert(a);
-
- if (a->flags & (IFA_F_DEPRECATED|IFA_F_TENTATIVE))
- return false;
-
- if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE))
- return false;
-
- return true;
-}
~ianmdlvl / elogind.git / blobdiff