diff options
Diffstat (limited to 'src/network/networkd-radv.c')
| -rw-r--r-- | src/network/networkd-radv.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/src/network/networkd-radv.c b/src/network/networkd-radv.c new file mode 100644 index 0000000..92cead0 --- /dev/null +++ b/src/network/networkd-radv.c @@ -0,0 +1,512 @@ +/* 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" +#include "string-table.h" +#include "strv.h" + +static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = { + [RADV_PREFIX_DELEGATION_NONE] = "no", + [RADV_PREFIX_DELEGATION_STATIC] = "static", + [RADV_PREFIX_DELEGATION_DHCP6] = "dhcpv6", + [RADV_PREFIX_DELEGATION_BOTH] = "yes", +}; + +DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN( + radv_prefix_delegation, + RADVPrefixDelegation, + RADV_PREFIX_DELEGATION_BOTH); + +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; + RADVPrefixDelegation d; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + d = radv_prefix_delegation_from_string(rvalue); + if (d < 0) { + log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Invalid router prefix delegation '%s', ignoring assignment.", rvalue); + return 0; + } + + network->router_prefix_delegation = d; + + 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); + } + + network_config_section_free(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; + + prefix->network = network; + LIST_APPEND(prefixes, network->static_prefixes, prefix); + network->n_static_prefixes++; + + if (filename) { + prefix->section = TAKE_PTR(n); + + r = hashmap_ensure_allocated(&network->prefixes_by_section, &network_config_hash_ops); + if (r < 0) + return r; + + r = hashmap_put(network->prefixes_by_section, prefix->section, prefix); + if (r < 0) + return r; + } + + *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) + continue; + if (r == -ENOEXEC) { + log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section."); + continue; + } + if (r < 0) + return r; + } + } + + return radv_emit_dns(link); +} |