| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| /*** |
| Copyright © 2017 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include <netinet/icmp6.h> |
| #include <arpa/inet.h> |
| |
| #include "networkd-address.h" |
| #include "networkd-manager.h" |
| #include "networkd-radv.h" |
| #include "parse-util.h" |
| #include "sd-radv.h" |
| #include "string-util.h" |
| |
| int config_parse_router_prefix_delegation( |
| 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) { |
| |
| Network *network = userdata; |
| int d; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| if (streq(rvalue, "static")) |
| network->router_prefix_delegation = RADV_PREFIX_DELEGATION_STATIC; |
| else if (streq(rvalue, "dhcpv6")) |
| network->router_prefix_delegation = RADV_PREFIX_DELEGATION_DHCP6; |
| else { |
| d = parse_boolean(rvalue); |
| if (d > 0) |
| network->router_prefix_delegation = RADV_PREFIX_DELEGATION_BOTH; |
| else |
| network->router_prefix_delegation = RADV_PREFIX_DELEGATION_NONE; |
| |
| if (d < 0) |
| log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router prefix delegation '%s' is invalid, ignoring assignment: %m", rvalue); |
| } |
| |
| return 0; |
| } |
| |
| int config_parse_router_preference(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) { |
| Network *network = userdata; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| if (streq(rvalue, "high")) |
| network->router_preference = SD_NDISC_PREFERENCE_HIGH; |
| else if (STR_IN_SET(rvalue, "medium", "normal", "default")) |
| network->router_preference = SD_NDISC_PREFERENCE_MEDIUM; |
| else if (streq(rvalue, "low")) |
| network->router_preference = SD_NDISC_PREFERENCE_LOW; |
| else |
| log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router preference '%s' is invalid, ignoring assignment: %m", rvalue); |
| |
| return 0; |
| } |
| |
| void prefix_free(Prefix *prefix) { |
| if (!prefix) |
| return; |
| |
| if (prefix->network) { |
| LIST_REMOVE(prefixes, prefix->network->static_prefixes, prefix); |
| assert(prefix->network->n_static_prefixes > 0); |
| prefix->network->n_static_prefixes--; |
| |
| if (prefix->section) |
| hashmap_remove(prefix->network->prefixes_by_section, |
| prefix->section); |
| } |
| |
| prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix); |
| |
| free(prefix); |
| } |
| |
| int prefix_new(Prefix **ret) { |
| _cleanup_(prefix_freep) Prefix *prefix = NULL; |
| |
| prefix = new0(Prefix, 1); |
| if (!prefix) |
| return -ENOMEM; |
| |
| if (sd_radv_prefix_new(&prefix->radv_prefix) < 0) |
| return -ENOMEM; |
| |
| *ret = TAKE_PTR(prefix); |
| |
| return 0; |
| } |
| |
| int prefix_new_static(Network *network, const char *filename, |
| unsigned section_line, Prefix **ret) { |
| _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL; |
| _cleanup_(prefix_freep) Prefix *prefix = NULL; |
| int r; |
| |
| assert(network); |
| assert(ret); |
| assert(!!filename == (section_line > 0)); |
| |
| if (filename) { |
| r = network_config_section_new(filename, section_line, &n); |
| if (r < 0) |
| return r; |
| |
| if (section_line) { |
| prefix = hashmap_get(network->prefixes_by_section, n); |
| if (prefix) { |
| *ret = TAKE_PTR(prefix); |
| |
| return 0; |
| } |
| } |
| } |
| |
| r = prefix_new(&prefix); |
| if (r < 0) |
| return r; |
| |
| if (filename) { |
| prefix->section = TAKE_PTR(n); |
| |
| r = hashmap_put(network->prefixes_by_section, prefix->section, |
| prefix); |
| if (r < 0) |
| return r; |
| } |
| |
| prefix->network = network; |
| LIST_APPEND(prefixes, network->static_prefixes, prefix); |
| network->n_static_prefixes++; |
| |
| *ret = TAKE_PTR(prefix); |
| |
| return 0; |
| } |
| |
| int config_parse_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) { |
| |
| Network *network = userdata; |
| _cleanup_(prefix_freep) Prefix *p = NULL; |
| uint8_t prefixlen = 64; |
| union in_addr_union in6addr; |
| int r; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| r = prefix_new_static(network, filename, section_line, &p); |
| if (r < 0) |
| return r; |
| |
| r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen); |
| if (r < 0) { |
| log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue); |
| return 0; |
| } |
| |
| if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0) |
| return -EADDRNOTAVAIL; |
| |
| log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue); |
| |
| p = NULL; |
| |
| return 0; |
| } |
| |
| int config_parse_prefix_flags(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) { |
| Network *network = userdata; |
| _cleanup_(prefix_freep) Prefix *p = NULL; |
| int r, val; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| r = prefix_new_static(network, filename, section_line, &p); |
| if (r < 0) |
| return r; |
| |
| r = parse_boolean(rvalue); |
| if (r < 0) { |
| log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue); |
| return 0; |
| } |
| |
| val = r; |
| |
| if (streq(lvalue, "OnLink")) |
| r = sd_radv_prefix_set_onlink(p->radv_prefix, val); |
| else if (streq(lvalue, "AddressAutoconfiguration")) |
| r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val); |
| if (r < 0) |
| return r; |
| |
| p = NULL; |
| |
| return 0; |
| } |
| |
| int config_parse_prefix_lifetime(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) { |
| Network *network = userdata; |
| _cleanup_(prefix_freep) Prefix *p = NULL; |
| usec_t usec; |
| int r; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| r = prefix_new_static(network, filename, section_line, &p); |
| if (r < 0) |
| return r; |
| |
| r = parse_sec(rvalue, &usec); |
| if (r < 0) { |
| log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue); |
| return 0; |
| } |
| |
| /* a value of 0xffffffff represents infinity */ |
| if (streq(lvalue, "PreferredLifetimeSec")) |
| r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix, |
| DIV_ROUND_UP(usec, USEC_PER_SEC)); |
| else if (streq(lvalue, "ValidLifetimeSec")) |
| r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix, |
| DIV_ROUND_UP(usec, USEC_PER_SEC)); |
| if (r < 0) |
| return r; |
| |
| p = NULL; |
| |
| return 0; |
| } |
| |
| static int radv_get_ip6dns(Network *network, struct in6_addr **dns, |
| size_t *n_dns) { |
| _cleanup_free_ struct in6_addr *addresses = NULL; |
| size_t i, n_addresses = 0, n_allocated = 0; |
| |
| assert(network); |
| assert(dns); |
| assert(n_dns); |
| |
| for (i = 0; i < network->n_dns; i++) { |
| union in_addr_union *addr; |
| |
| if (network->dns[i].family != AF_INET6) |
| continue; |
| |
| addr = &network->dns[i].address; |
| |
| if (in_addr_is_null(AF_INET6, addr) || |
| in_addr_is_link_local(AF_INET6, addr) || |
| in_addr_is_localhost(AF_INET6, addr)) |
| continue; |
| |
| if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1)) |
| return -ENOMEM; |
| |
| addresses[n_addresses++] = addr->in6; |
| } |
| |
| if (addresses) { |
| *dns = TAKE_PTR(addresses); |
| |
| *n_dns = n_addresses; |
| } |
| |
| return n_addresses; |
| } |
| |
| static int radv_set_dns(Link *link, Link *uplink) { |
| _cleanup_free_ struct in6_addr *dns = NULL; |
| size_t n_dns; |
| usec_t lifetime_usec; |
| int r; |
| |
| if (!link->network->router_emit_dns) |
| return 0; |
| |
| if (link->network->router_dns) { |
| dns = newdup(struct in6_addr, link->network->router_dns, |
| link->network->n_router_dns); |
| if (dns == NULL) |
| return -ENOMEM; |
| |
| n_dns = link->network->n_router_dns; |
| lifetime_usec = link->network->router_dns_lifetime_usec; |
| |
| goto set_dns; |
| } |
| |
| lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC; |
| |
| r = radv_get_ip6dns(link->network, &dns, &n_dns); |
| if (r > 0) |
| goto set_dns; |
| |
| if (uplink) { |
| if (uplink->network == NULL) { |
| log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us"); |
| return 0; |
| } |
| |
| r = radv_get_ip6dns(uplink->network, &dns, &n_dns); |
| if (r > 0) |
| goto set_dns; |
| } |
| |
| return 0; |
| |
| set_dns: |
| return sd_radv_set_rdnss(link->radv, |
| DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC), |
| dns, n_dns); |
| } |
| |
| static int radv_set_domains(Link *link, Link *uplink) { |
| char **search_domains; |
| usec_t lifetime_usec; |
| |
| if (!link->network->router_emit_domains) |
| return 0; |
| |
| search_domains = link->network->router_search_domains; |
| lifetime_usec = link->network->router_dns_lifetime_usec; |
| |
| if (search_domains) |
| goto set_domains; |
| |
| lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC; |
| |
| search_domains = link->network->search_domains; |
| if (search_domains) |
| goto set_domains; |
| |
| if (uplink) { |
| if (uplink->network == NULL) { |
| log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us"); |
| return 0; |
| } |
| |
| search_domains = uplink->network->search_domains; |
| if (search_domains) |
| goto set_domains; |
| } |
| |
| return 0; |
| |
| set_domains: |
| return sd_radv_set_dnssl(link->radv, |
| DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC), |
| search_domains); |
| |
| } |
| |
| int radv_emit_dns(Link *link) { |
| Link *uplink; |
| int r; |
| |
| uplink = manager_find_uplink(link->manager, link); |
| |
| r = radv_set_dns(link, uplink); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Could not set RA DNS: %m"); |
| |
| r = radv_set_domains(link, uplink); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Could not set RA Domains: %m"); |
| |
| return 0; |
| } |
| |
| int radv_configure(Link *link) { |
| int r; |
| Prefix *p; |
| |
| assert(link); |
| assert(link->network); |
| |
| r = sd_radv_new(&link->radv); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_attach_event(link->radv, NULL, 0); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_set_mac(link->radv, &link->mac); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_set_ifindex(link->radv, link->ifindex); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_set_managed_information(link->radv, link->network->router_managed); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_set_other_information(link->radv, link->network->router_other_information); |
| if (r < 0) |
| return r; |
| |
| /* a value of 0xffffffff represents infinity, 0x0 means this host is |
| not a router */ |
| r = sd_radv_set_router_lifetime(link->radv, |
| DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC)); |
| if (r < 0) |
| return r; |
| |
| if (link->network->router_lifetime_usec > 0) { |
| r = sd_radv_set_preference(link->radv, |
| link->network->router_preference); |
| if (r < 0) |
| return r; |
| } |
| |
| if (IN_SET(link->network->router_prefix_delegation, |
| RADV_PREFIX_DELEGATION_STATIC, |
| RADV_PREFIX_DELEGATION_BOTH)) { |
| LIST_FOREACH(prefixes, p, link->network->static_prefixes) { |
| r = sd_radv_add_prefix(link->radv, p->radv_prefix, false); |
| if (r != -EEXIST && r < 0) |
| return r; |
| } |
| } |
| |
| return radv_emit_dns(link); |
| } |