ca5394d260
Previously, we'd use a link as "default" route depending on whether there are route-only domains defined on it or not. (If there are, it would not be used as default route, if there aren't it would.) Let's make this explicit and add a link variable controlling this. The variable is not changeable from the outside yet, but subsequent commits are supposed to add that. Note that making this configurable adds a certain amount of redundancy, as there are now two ways to ensure a link does not receive "default" lookup (i.e. DNS queries matching no configured route): 1. By ensuring that at least one other link configures a route on it (for example by add "." to its search list) 2. By setting this new boolean to false. But this is exactly what is intended with this patch: that there is an explicit way to configure on the link itself whether it receives 'default' traffic, rather than require this to be configured on other links. The variable added is a tri-state: if true, the link is suitable for recieving "default" traffic. If false, the link is not suitable for it. If unset (i.e. negative) the original logic of "has this route-only routes" is used, to ensure compatibility with the status quo ante.
113 lines
3 KiB
C
113 lines
3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <net/if.h>
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#include "in-addr-util.h"
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#include "ratelimit.h"
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#include "resolve-util.h"
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typedef struct Link Link;
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typedef struct LinkAddress LinkAddress;
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#include "resolved-dns-rr.h"
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#include "resolved-dns-scope.h"
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#include "resolved-dns-search-domain.h"
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#include "resolved-dns-server.h"
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#include "resolved-manager.h"
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#define LINK_SEARCH_DOMAINS_MAX 256
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#define LINK_DNS_SERVERS_MAX 256
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struct LinkAddress {
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Link *link;
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int family;
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union in_addr_union in_addr;
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unsigned char flags, scope;
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DnsResourceRecord *llmnr_address_rr;
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DnsResourceRecord *llmnr_ptr_rr;
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DnsResourceRecord *mdns_address_rr;
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DnsResourceRecord *mdns_ptr_rr;
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LIST_FIELDS(LinkAddress, addresses);
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};
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struct Link {
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Manager *manager;
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int ifindex;
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unsigned flags;
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LIST_HEAD(LinkAddress, addresses);
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unsigned n_addresses;
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LIST_HEAD(DnsServer, dns_servers);
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DnsServer *current_dns_server;
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unsigned n_dns_servers;
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LIST_HEAD(DnsSearchDomain, search_domains);
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unsigned n_search_domains;
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int default_route;
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ResolveSupport llmnr_support;
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ResolveSupport mdns_support;
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DnsOverTlsMode dns_over_tls_mode;
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DnssecMode dnssec_mode;
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Set *dnssec_negative_trust_anchors;
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DnsScope *unicast_scope;
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DnsScope *llmnr_ipv4_scope;
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DnsScope *llmnr_ipv6_scope;
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DnsScope *mdns_ipv4_scope;
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DnsScope *mdns_ipv6_scope;
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bool is_managed;
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char name[IF_NAMESIZE];
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uint32_t mtu;
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uint8_t operstate;
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bool loaded;
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char *state_file;
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bool unicast_relevant;
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};
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int link_new(Manager *m, Link **ret, int ifindex);
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Link *link_free(Link *l);
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int link_process_rtnl(Link *l, sd_netlink_message *m);
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int link_update(Link *l);
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bool link_relevant(Link *l, int family, bool local_multicast);
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LinkAddress* link_find_address(Link *l, int family, const union in_addr_union *in_addr);
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void link_add_rrs(Link *l, bool force_remove);
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void link_flush_settings(Link *l);
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void link_set_dnssec_mode(Link *l, DnssecMode mode);
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void link_set_dns_over_tls_mode(Link *l, DnsOverTlsMode mode);
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void link_allocate_scopes(Link *l);
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DnsServer* link_set_dns_server(Link *l, DnsServer *s);
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DnsServer* link_get_dns_server(Link *l);
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void link_next_dns_server(Link *l);
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DnssecMode link_get_dnssec_mode(Link *l);
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bool link_dnssec_supported(Link *l);
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DnsOverTlsMode link_get_dns_over_tls_mode(Link *l);
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int link_save_user(Link *l);
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int link_load_user(Link *l);
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void link_remove_user(Link *l);
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int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr);
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LinkAddress *link_address_free(LinkAddress *a);
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int link_address_update_rtnl(LinkAddress *a, sd_netlink_message *m);
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bool link_address_relevant(LinkAddress *l, bool local_multicast);
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void link_address_add_rrs(LinkAddress *a, bool force_remove);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_free);
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