1084 lines
38 KiB
C
1084 lines
38 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright © 2014 Intel Corporation. All rights reserved.
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***/
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#include <netinet/icmp6.h>
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#include <arpa/inet.h>
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#include "sd-ndisc.h"
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#include "missing_network.h"
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#include "networkd-dhcp6.h"
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#include "networkd-manager.h"
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#include "networkd-ndisc.h"
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#include "networkd-route.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#define NDISC_DNSSL_MAX 64U
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#define NDISC_RDNSS_MAX 64U
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#define NDISC_PREFIX_LFT_MIN 7200U
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#define DAD_CONFLICTS_IDGEN_RETRIES_RFC7217 3
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/* https://tools.ietf.org/html/rfc5453 */
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/* https://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xml */
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#define SUBNET_ROUTER_ANYCAST_ADDRESS_RFC4291 ((struct in6_addr) { .s6_addr = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } })
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#define SUBNET_ROUTER_ANYCAST_PREFIXLEN 8
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#define RESERVED_IPV6_INTERFACE_IDENTIFIERS_ADDRESS_RFC4291 ((struct in6_addr) { .s6_addr = { 0x02, 0x00, 0x5E, 0xFF, 0xFE } })
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#define RESERVED_IPV6_INTERFACE_IDENTIFIERS_PREFIXLEN 5
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#define RESERVED_SUBNET_ANYCAST_ADDRESSES_RFC4291 ((struct in6_addr) { .s6_addr = { 0xFD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF } })
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#define RESERVED_SUBNET_ANYCAST_PREFIXLEN 7
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#define NDISC_APP_ID SD_ID128_MAKE(13,ac,81,a7,d5,3f,49,78,92,79,5d,0c,29,3a,bc,7e)
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static bool stableprivate_address_is_valid(const struct in6_addr *addr) {
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assert(addr);
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/* According to rfc4291, generated address should not be in the following ranges. */
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if (memcmp(addr, &SUBNET_ROUTER_ANYCAST_ADDRESS_RFC4291, SUBNET_ROUTER_ANYCAST_PREFIXLEN) == 0)
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return false;
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if (memcmp(addr, &RESERVED_IPV6_INTERFACE_IDENTIFIERS_ADDRESS_RFC4291, RESERVED_IPV6_INTERFACE_IDENTIFIERS_PREFIXLEN) == 0)
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return false;
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if (memcmp(addr, &RESERVED_SUBNET_ANYCAST_ADDRESSES_RFC4291, RESERVED_SUBNET_ANYCAST_PREFIXLEN) == 0)
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return false;
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return true;
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}
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static int make_stableprivate_address(Link *link, const struct in6_addr *prefix, uint8_t prefix_len, uint8_t dad_counter, struct in6_addr *addr) {
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sd_id128_t secret_key;
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struct siphash state;
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uint64_t rid;
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size_t l;
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int r;
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/* According to rfc7217 section 5.1
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* RID = F(Prefix, Net_Iface, Network_ID, DAD_Counter, secret_key) */
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r = sd_id128_get_machine_app_specific(NDISC_APP_ID, &secret_key);
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if (r < 0)
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return log_error_errno(r, "Failed to generate key: %m");
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siphash24_init(&state, secret_key.bytes);
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l = MAX(DIV_ROUND_UP(prefix_len, 8), 8);
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siphash24_compress(prefix, l, &state);
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siphash24_compress(link->ifname, strlen(link->ifname), &state);
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siphash24_compress(&link->mac, sizeof(struct ether_addr), &state);
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siphash24_compress(&dad_counter, sizeof(uint8_t), &state);
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rid = htole64(siphash24_finalize(&state));
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memcpy(addr->s6_addr, prefix->s6_addr, l);
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memcpy(addr->s6_addr + l, &rid, 16 - l);
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return 0;
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}
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static int ndisc_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(link);
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assert(link->ndisc_routes_messages > 0);
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link->ndisc_routes_messages--;
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return 1;
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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log_link_message_error_errno(link, m, r, "Could not set NDisc route");
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link_enter_failed(link);
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return 1;
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}
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if (link->ndisc_routes_messages == 0) {
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log_link_debug(link, "NDisc routes set.");
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link->ndisc_routes_configured = true;
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link_check_ready(link);
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}
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return 1;
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}
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static int ndisc_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(link);
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assert(link->ndisc_addresses_messages > 0);
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link->ndisc_addresses_messages--;
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return 1;
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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log_link_message_error_errno(link, m, r, "Could not set NDisc address");
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link_enter_failed(link);
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return 1;
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} else if (r >= 0)
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(void) manager_rtnl_process_address(rtnl, m, link->manager);
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if (link->ndisc_addresses_messages == 0) {
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log_link_debug(link, "NDisc SLAAC addresses set.");
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link->ndisc_addresses_configured = true;
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r = link_request_set_routes(link);
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if (r < 0) {
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link_enter_failed(link);
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return 1;
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}
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}
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return 1;
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}
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static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
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_cleanup_(route_freep) Route *route = NULL;
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union in_addr_union gateway;
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uint16_t lifetime;
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unsigned preference;
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uint32_t mtu;
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usec_t time_now;
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int r;
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Address *address;
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Iterator i;
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assert(link);
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assert(rt);
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r = sd_ndisc_router_get_lifetime(rt, &lifetime);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get gateway address from RA: %m");
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if (lifetime == 0) /* not a default router */
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return 0;
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r = sd_ndisc_router_get_address(rt, &gateway.in6);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get gateway address from RA: %m");
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SET_FOREACH(address, link->addresses, i) {
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if (address->family != AF_INET6)
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continue;
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if (in_addr_equal(AF_INET6, &gateway, &address->in_addr)) {
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_cleanup_free_ char *buffer = NULL;
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(void) in_addr_to_string(AF_INET6, &address->in_addr, &buffer);
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log_link_debug(link, "No NDisc route added, gateway %s matches local address",
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strnull(buffer));
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return 0;
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}
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}
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SET_FOREACH(address, link->addresses_foreign, i) {
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if (address->family != AF_INET6)
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continue;
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if (in_addr_equal(AF_INET6, &gateway, &address->in_addr)) {
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_cleanup_free_ char *buffer = NULL;
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(void) in_addr_to_string(AF_INET6, &address->in_addr, &buffer);
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log_link_debug(link, "No NDisc route added, gateway %s matches local address",
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strnull(buffer));
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return 0;
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}
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}
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r = sd_ndisc_router_get_preference(rt, &preference);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get default router preference from RA: %m");
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r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
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r = sd_ndisc_router_get_mtu(rt, &mtu);
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if (r == -ENODATA)
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mtu = 0;
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else if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get default router MTU from RA: %m");
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r = route_new(&route);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate route: %m");
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route->family = AF_INET6;
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route->table = link_get_ipv6_accept_ra_route_table(link);
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route->priority = link->network->dhcp6_route_metric;
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route->protocol = RTPROT_RA;
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route->pref = preference;
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route->gw = gateway;
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route->lifetime = time_now + lifetime * USEC_PER_SEC;
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route->mtu = mtu;
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r = route_configure(route, link, ndisc_route_handler);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not set default route: %m");
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link_enter_failed(link);
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return r;
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}
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if (r > 0)
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link->ndisc_routes_messages++;
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Route *route_gw;
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LIST_FOREACH(routes, route_gw, link->network->static_routes) {
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if (!route_gw->gateway_from_dhcp)
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continue;
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if (route_gw->family != AF_INET6)
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continue;
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route_gw->gw = gateway;
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r = route_configure(route_gw, link, ndisc_route_handler);
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if (r < 0) {
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log_link_error_errno(link, r, "Could not set gateway: %m");
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link_enter_failed(link);
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return r;
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}
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if (r > 0)
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link->ndisc_routes_messages++;
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}
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return 0;
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}
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static int ndisc_router_generate_addresses(Link *link, unsigned prefixlen, uint32_t lifetime_preferred, Address *address, Set **ret) {
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_cleanup_set_free_free_ Set *addresses = NULL;
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struct in6_addr addr;
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IPv6Token *j;
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Iterator i;
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int r;
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assert(link);
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assert(address);
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assert(ret);
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addresses = set_new(&address_hash_ops);
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if (!addresses)
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return log_oom();
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addr = address->in_addr.in6;
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ORDERED_HASHMAP_FOREACH(j, link->network->ipv6_tokens, i) {
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bool have_address = false;
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_cleanup_(address_freep) Address *new_address = NULL;
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r = address_new(&new_address);
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if (r < 0)
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return log_oom();
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*new_address = *address;
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if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE
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&& memcmp(&j->prefix, &addr, FAMILY_ADDRESS_SIZE(address->family)) == 0) {
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/* While this loop uses dad_counter and a retry limit as specified in RFC 7217, the loop
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does not actually attempt Duplicate Address Detection; the counter will be incremented
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only when the address generation algorithm produces an invalid address, and the loop
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may exit with an address which ends up being unusable due to duplication on the link.
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*/
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for (; j->dad_counter < DAD_CONFLICTS_IDGEN_RETRIES_RFC7217; j->dad_counter++) {
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r = make_stableprivate_address(link, &j->prefix, prefixlen, j->dad_counter, &new_address->in_addr.in6);
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if (r < 0)
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break;
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if (stableprivate_address_is_valid(&new_address->in_addr.in6)) {
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have_address = true;
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break;
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}
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}
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} else if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_STATIC) {
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memcpy(new_address->in_addr.in6.s6_addr + 8, j->prefix.s6_addr + 8, 8);
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have_address = true;
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}
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if (have_address) {
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new_address->prefixlen = prefixlen;
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new_address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
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new_address->cinfo.ifa_prefered = lifetime_preferred;
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r = set_put(addresses, new_address);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to store address: %m");
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TAKE_PTR(new_address);
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}
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}
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/* fall back to EUI-64 if no tokens provided addresses */
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if (set_isempty(addresses)) {
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_cleanup_(address_freep) Address *new_address = NULL;
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r = address_new(&new_address);
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if (r < 0)
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return log_oom();
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*new_address = *address;
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r = generate_ipv6_eui_64_address(link, &new_address->in_addr.in6);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to generate EUI64 address: %m");
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new_address->prefixlen = prefixlen;
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new_address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
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new_address->cinfo.ifa_prefered = lifetime_preferred;
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r = set_put(addresses, new_address);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to store address: %m");
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TAKE_PTR(new_address);
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}
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*ret = TAKE_PTR(addresses);
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return 0;
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}
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static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) {
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uint32_t lifetime_valid, lifetime_preferred, lifetime_remaining;
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_cleanup_set_free_free_ Set *addresses = NULL;
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_cleanup_(address_freep) Address *address = NULL;
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unsigned prefixlen;
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usec_t time_now;
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Address *existing_address, *a;
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Iterator i;
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int r;
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assert(link);
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assert(rt);
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r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
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r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix length: %m");
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r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_valid);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix valid lifetime: %m");
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r = sd_ndisc_router_prefix_get_preferred_lifetime(rt, &lifetime_preferred);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix preferred lifetime: %m");
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/* The preferred lifetime is never greater than the valid lifetime */
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if (lifetime_preferred > lifetime_valid)
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return 0;
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r = address_new(&address);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate address: %m");
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address->family = AF_INET6;
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r = sd_ndisc_router_prefix_get_address(rt, &address->in_addr.in6);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix address: %m");
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r = ndisc_router_generate_addresses(link, prefixlen, lifetime_preferred, address, &addresses);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to generate SLAAC addresses: %m");
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SET_FOREACH(a, addresses, i) {
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/* see RFC4862 section 5.5.3.e */
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r = address_get(link, a->family, &a->in_addr, a->prefixlen, &existing_address);
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if (r > 0) {
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lifetime_remaining = existing_address->cinfo.tstamp / 100 + existing_address->cinfo.ifa_valid - time_now / USEC_PER_SEC;
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if (lifetime_valid > NDISC_PREFIX_LFT_MIN || lifetime_valid > lifetime_remaining)
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a->cinfo.ifa_valid = lifetime_valid;
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else if (lifetime_remaining <= NDISC_PREFIX_LFT_MIN)
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a->cinfo.ifa_valid = lifetime_remaining;
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else
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a->cinfo.ifa_valid = NDISC_PREFIX_LFT_MIN;
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} else if (lifetime_valid > 0)
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a->cinfo.ifa_valid = lifetime_valid;
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else
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continue; /* see RFC4862 section 5.5.3.d */
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if (a->cinfo.ifa_valid == 0)
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continue;
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r = address_configure(a, link, ndisc_address_handler, true);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not set SLAAC address: %m");
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link_enter_failed(link);
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return r;
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}
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if (r > 0)
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link->ndisc_addresses_messages++;
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}
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return 0;
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}
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static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) {
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_cleanup_(route_freep) Route *route = NULL;
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usec_t time_now;
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uint32_t lifetime;
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unsigned prefixlen;
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int r;
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assert(link);
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assert(rt);
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r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
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r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix length: %m");
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r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix lifetime: %m");
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r = route_new(&route);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate route: %m");
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route->family = AF_INET6;
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route->table = link_get_ipv6_accept_ra_route_table(link);
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route->priority = link->network->dhcp6_route_metric;
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route->protocol = RTPROT_RA;
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route->flags = RTM_F_PREFIX;
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route->dst_prefixlen = prefixlen;
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route->lifetime = time_now + lifetime * USEC_PER_SEC;
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r = sd_ndisc_router_prefix_get_address(rt, &route->dst.in6);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix address: %m");
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|
|
r = route_configure(route, link, ndisc_route_handler);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "Could not set prefix route: %m");
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
if (r > 0)
|
|
link->ndisc_routes_messages++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
|
|
_cleanup_(route_freep) Route *route = NULL;
|
|
struct in6_addr gateway;
|
|
uint32_t lifetime;
|
|
unsigned preference, prefixlen;
|
|
usec_t time_now;
|
|
int r;
|
|
|
|
assert(link);
|
|
|
|
r = sd_ndisc_router_route_get_lifetime(rt, &lifetime);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get gateway address from RA: %m");
|
|
|
|
if (lifetime == 0)
|
|
return 0;
|
|
|
|
r = sd_ndisc_router_get_address(rt, &gateway);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get gateway address from RA: %m");
|
|
|
|
r = sd_ndisc_router_route_get_prefixlen(rt, &prefixlen);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get route prefix length: %m");
|
|
|
|
r = sd_ndisc_router_route_get_preference(rt, &preference);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get default router preference from RA: %m");
|
|
|
|
r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
|
|
|
|
r = route_new(&route);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Could not allocate route: %m");
|
|
|
|
route->family = AF_INET6;
|
|
route->table = link_get_ipv6_accept_ra_route_table(link);
|
|
route->priority = link->network->dhcp6_route_metric;
|
|
route->protocol = RTPROT_RA;
|
|
route->pref = preference;
|
|
route->gw.in6 = gateway;
|
|
route->dst_prefixlen = prefixlen;
|
|
route->lifetime = time_now + lifetime * USEC_PER_SEC;
|
|
|
|
r = sd_ndisc_router_route_get_address(rt, &route->dst.in6);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to get route address: %m");
|
|
|
|
r = route_configure(route, link, ndisc_route_handler);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "Could not set additional route: %m");
|
|
link_enter_failed(link);
|
|
return r;
|
|
}
|
|
if (r > 0)
|
|
link->ndisc_routes_messages++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ndisc_rdnss_hash_func(const NDiscRDNSS *x, struct siphash *state) {
|
|
siphash24_compress(&x->address, sizeof(x->address), state);
|
|
}
|
|
|
|
static int ndisc_rdnss_compare_func(const NDiscRDNSS *a, const NDiscRDNSS *b) {
|
|
return memcmp(&a->address, &b->address, sizeof(a->address));
|
|
}
|
|
|
|
DEFINE_PRIVATE_HASH_OPS(ndisc_rdnss_hash_ops, NDiscRDNSS, ndisc_rdnss_hash_func, ndisc_rdnss_compare_func);
|
|
|
|
static int ndisc_router_process_rdnss(Link *link, sd_ndisc_router *rt) {
|
|
uint32_t lifetime;
|
|
const struct in6_addr *a;
|
|
usec_t time_now;
|
|
int i, n, r;
|
|
|
|
assert(link);
|
|
assert(rt);
|
|
|
|
r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
|
|
|
|
r = sd_ndisc_router_rdnss_get_lifetime(rt, &lifetime);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get RDNSS lifetime: %m");
|
|
|
|
n = sd_ndisc_router_rdnss_get_addresses(rt, &a);
|
|
if (n < 0)
|
|
return log_link_warning_errno(link, n, "Failed to get RDNSS addresses: %m");
|
|
|
|
for (i = 0; i < n; i++) {
|
|
_cleanup_free_ NDiscRDNSS *x = NULL;
|
|
NDiscRDNSS d = {
|
|
.address = a[i],
|
|
}, *y;
|
|
|
|
if (lifetime == 0) {
|
|
(void) set_remove(link->ndisc_rdnss, &d);
|
|
link_dirty(link);
|
|
continue;
|
|
}
|
|
|
|
y = set_get(link->ndisc_rdnss, &d);
|
|
if (y) {
|
|
y->valid_until = time_now + lifetime * USEC_PER_SEC;
|
|
continue;
|
|
}
|
|
|
|
ndisc_vacuum(link);
|
|
|
|
if (set_size(link->ndisc_rdnss) >= NDISC_RDNSS_MAX) {
|
|
log_link_warning(link, "Too many RDNSS records per link, ignoring.");
|
|
continue;
|
|
}
|
|
|
|
x = new(NDiscRDNSS, 1);
|
|
if (!x)
|
|
return log_oom();
|
|
|
|
*x = (NDiscRDNSS) {
|
|
.address = a[i],
|
|
.valid_until = time_now + lifetime * USEC_PER_SEC,
|
|
};
|
|
|
|
r = set_ensure_consume(&link->ndisc_rdnss, &ndisc_rdnss_hash_ops, TAKE_PTR(x));
|
|
if (r < 0)
|
|
return log_oom();
|
|
assert(r > 0);
|
|
|
|
link_dirty(link);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ndisc_dnssl_hash_func(const NDiscDNSSL *x, struct siphash *state) {
|
|
siphash24_compress(NDISC_DNSSL_DOMAIN(x), strlen(NDISC_DNSSL_DOMAIN(x)), state);
|
|
}
|
|
|
|
static int ndisc_dnssl_compare_func(const NDiscDNSSL *a, const NDiscDNSSL *b) {
|
|
return strcmp(NDISC_DNSSL_DOMAIN(a), NDISC_DNSSL_DOMAIN(b));
|
|
}
|
|
|
|
DEFINE_PRIVATE_HASH_OPS(ndisc_dnssl_hash_ops, NDiscDNSSL, ndisc_dnssl_hash_func, ndisc_dnssl_compare_func);
|
|
|
|
static void ndisc_router_process_dnssl(Link *link, sd_ndisc_router *rt) {
|
|
_cleanup_strv_free_ char **l = NULL;
|
|
uint32_t lifetime;
|
|
usec_t time_now;
|
|
char **i;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(rt);
|
|
|
|
r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
|
|
return;
|
|
}
|
|
|
|
r = sd_ndisc_router_dnssl_get_lifetime(rt, &lifetime);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "Failed to get RDNSS lifetime: %m");
|
|
return;
|
|
}
|
|
|
|
r = sd_ndisc_router_dnssl_get_domains(rt, &l);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "Failed to get RDNSS addresses: %m");
|
|
return;
|
|
}
|
|
|
|
STRV_FOREACH(i, l) {
|
|
_cleanup_free_ NDiscDNSSL *s;
|
|
NDiscDNSSL *x;
|
|
|
|
s = malloc0(ALIGN(sizeof(NDiscDNSSL)) + strlen(*i) + 1);
|
|
if (!s) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
|
|
strcpy(NDISC_DNSSL_DOMAIN(s), *i);
|
|
|
|
if (lifetime == 0) {
|
|
(void) set_remove(link->ndisc_dnssl, s);
|
|
link_dirty(link);
|
|
continue;
|
|
}
|
|
|
|
x = set_get(link->ndisc_dnssl, s);
|
|
if (x) {
|
|
x->valid_until = time_now + lifetime * USEC_PER_SEC;
|
|
continue;
|
|
}
|
|
|
|
ndisc_vacuum(link);
|
|
|
|
if (set_size(link->ndisc_dnssl) >= NDISC_DNSSL_MAX) {
|
|
log_link_warning(link, "Too many DNSSL records per link, ignoring.");
|
|
continue;
|
|
}
|
|
|
|
s->valid_until = time_now + lifetime * USEC_PER_SEC;
|
|
|
|
r = set_ensure_consume(&link->ndisc_dnssl, &ndisc_dnssl_hash_ops, TAKE_PTR(s));
|
|
if (r < 0) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
assert(r > 0);
|
|
|
|
link_dirty(link);
|
|
}
|
|
}
|
|
|
|
static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) {
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(rt);
|
|
|
|
r = sd_ndisc_router_option_rewind(rt);
|
|
for (;;) {
|
|
uint8_t type;
|
|
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to iterate through options: %m");
|
|
if (r == 0) /* EOF */
|
|
break;
|
|
|
|
r = sd_ndisc_router_option_get_type(rt, &type);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get RA option type: %m");
|
|
|
|
switch (type) {
|
|
|
|
case SD_NDISC_OPTION_PREFIX_INFORMATION: {
|
|
union in_addr_union a;
|
|
uint8_t flags;
|
|
|
|
r = sd_ndisc_router_prefix_get_address(rt, &a.in6);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to get prefix address: %m");
|
|
|
|
if (set_contains(link->network->ndisc_deny_listed_prefix, &a.in6)) {
|
|
if (DEBUG_LOGGING) {
|
|
_cleanup_free_ char *b = NULL;
|
|
|
|
(void) in_addr_to_string(AF_INET6, &a, &b);
|
|
log_link_debug(link, "Prefix '%s' is deny-listed, ignoring", strna(b));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
r = sd_ndisc_router_prefix_get_flags(rt, &flags);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get RA prefix flags: %m");
|
|
|
|
if (link->network->ipv6_accept_ra_use_onlink_prefix &&
|
|
FLAGS_SET(flags, ND_OPT_PI_FLAG_ONLINK))
|
|
(void) ndisc_router_process_onlink_prefix(link, rt);
|
|
|
|
if (link->network->ipv6_accept_ra_use_autonomous_prefix &&
|
|
FLAGS_SET(flags, ND_OPT_PI_FLAG_AUTO))
|
|
(void) ndisc_router_process_autonomous_prefix(link, rt);
|
|
|
|
break;
|
|
}
|
|
|
|
case SD_NDISC_OPTION_ROUTE_INFORMATION:
|
|
(void) ndisc_router_process_route(link, rt);
|
|
break;
|
|
|
|
case SD_NDISC_OPTION_RDNSS:
|
|
if (link->network->ipv6_accept_ra_use_dns)
|
|
(void) ndisc_router_process_rdnss(link, rt);
|
|
break;
|
|
|
|
case SD_NDISC_OPTION_DNSSL:
|
|
if (link->network->ipv6_accept_ra_use_dns)
|
|
(void) ndisc_router_process_dnssl(link, rt);
|
|
break;
|
|
}
|
|
|
|
r = sd_ndisc_router_option_next(rt);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ndisc_router_handler(Link *link, sd_ndisc_router *rt) {
|
|
uint64_t flags;
|
|
int r;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
assert(link->manager);
|
|
assert(rt);
|
|
|
|
r = sd_ndisc_router_get_flags(rt, &flags);
|
|
if (r < 0)
|
|
return log_link_warning_errno(link, r, "Failed to get RA flags: %m");
|
|
|
|
if ((flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER) && link->network->ipv6_accept_ra_start_dhcp6_client)) {
|
|
|
|
if (link->network->ipv6_accept_ra_start_dhcp6_client == IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS)
|
|
r = dhcp6_request_address(link, false);
|
|
else
|
|
/* (re)start DHCPv6 client in stateful or stateless mode according to RA flags */
|
|
r = dhcp6_request_address(link, !(flags & ND_RA_FLAG_MANAGED));
|
|
|
|
if (r < 0 && r != -EBUSY)
|
|
log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease on NDisc request: %m");
|
|
else {
|
|
log_link_debug(link, "Acquiring DHCPv6 lease on NDisc request");
|
|
r = 0;
|
|
}
|
|
}
|
|
|
|
(void) ndisc_router_process_default(link, rt);
|
|
(void) ndisc_router_process_options(link, rt);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void ndisc_handler(sd_ndisc *nd, sd_ndisc_event event, sd_ndisc_router *rt, void *userdata) {
|
|
Link *link = userdata;
|
|
|
|
assert(link);
|
|
|
|
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
|
|
return;
|
|
|
|
switch (event) {
|
|
|
|
case SD_NDISC_EVENT_ROUTER:
|
|
link->ndisc_addresses_configured = false;
|
|
link->ndisc_routes_configured = false;
|
|
|
|
(void) ndisc_router_handler(link, rt);
|
|
|
|
if (link->ndisc_addresses_messages == 0)
|
|
link->ndisc_addresses_configured = true;
|
|
else {
|
|
log_link_debug(link, "Setting SLAAC addresses.");
|
|
|
|
/* address_handler calls link_request_set_routes() and link_request_set_nexthop().
|
|
* Before they are called, the related flags must be cleared. Otherwise, the link
|
|
* becomes configured state before routes are configured. */
|
|
link->static_routes_configured = false;
|
|
link->static_nexthops_configured = false;
|
|
}
|
|
|
|
if (link->ndisc_routes_messages == 0)
|
|
link->ndisc_routes_configured = true;
|
|
else
|
|
log_link_debug(link, "Setting NDisc routes.");
|
|
|
|
if (link->ndisc_addresses_configured && link->ndisc_routes_configured)
|
|
link_check_ready(link);
|
|
else
|
|
link_set_state(link, LINK_STATE_CONFIGURING);
|
|
break;
|
|
|
|
case SD_NDISC_EVENT_TIMEOUT:
|
|
log_link_debug(link, "NDISC handler get timeout event");
|
|
link->ndisc_addresses_configured = true;
|
|
link->ndisc_routes_configured = true;
|
|
link_check_ready(link);
|
|
|
|
break;
|
|
default:
|
|
log_link_warning(link, "IPv6 Neighbor Discovery unknown event: %d", event);
|
|
}
|
|
}
|
|
|
|
int ndisc_configure(Link *link) {
|
|
int r;
|
|
|
|
assert(link);
|
|
|
|
r = sd_ndisc_new(&link->ndisc);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_ndisc_attach_event(link->ndisc, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_ndisc_set_mac(link->ndisc, &link->mac);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_ndisc_set_ifindex(link->ndisc, link->ifindex);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_ndisc_set_callback(link->ndisc, ndisc_handler, link);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ndisc_vacuum(Link *link) {
|
|
NDiscRDNSS *r;
|
|
NDiscDNSSL *d;
|
|
Iterator i;
|
|
usec_t time_now;
|
|
|
|
assert(link);
|
|
|
|
/* Removes all RDNSS and DNSSL entries whose validity time has passed */
|
|
|
|
time_now = now(clock_boottime_or_monotonic());
|
|
|
|
SET_FOREACH(r, link->ndisc_rdnss, i)
|
|
if (r->valid_until < time_now) {
|
|
free(set_remove(link->ndisc_rdnss, r));
|
|
link_dirty(link);
|
|
}
|
|
|
|
SET_FOREACH(d, link->ndisc_dnssl, i)
|
|
if (d->valid_until < time_now) {
|
|
free(set_remove(link->ndisc_dnssl, d));
|
|
link_dirty(link);
|
|
}
|
|
}
|
|
|
|
void ndisc_flush(Link *link) {
|
|
assert(link);
|
|
|
|
/* Removes all RDNSS and DNSSL entries, without exception */
|
|
|
|
link->ndisc_rdnss = set_free_free(link->ndisc_rdnss);
|
|
link->ndisc_dnssl = set_free_free(link->ndisc_dnssl);
|
|
}
|
|
|
|
int ipv6token_new(IPv6Token **ret) {
|
|
IPv6Token *p;
|
|
|
|
p = new(IPv6Token, 1);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
*p = (IPv6Token) {
|
|
.address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_NONE,
|
|
};
|
|
|
|
*ret = TAKE_PTR(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
|
|
ipv6_token_hash_ops,
|
|
void,
|
|
trivial_hash_func,
|
|
trivial_compare_func,
|
|
IPv6Token,
|
|
free);
|
|
|
|
int config_parse_ndisc_deny_listed_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 = data;
|
|
const char *p;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
assert(data);
|
|
|
|
if (isempty(rvalue)) {
|
|
network->ndisc_deny_listed_prefix = set_free_free(network->ndisc_deny_listed_prefix);
|
|
return 0;
|
|
}
|
|
|
|
for (p = rvalue;;) {
|
|
_cleanup_free_ char *n = NULL;
|
|
_cleanup_free_ struct in6_addr *a = NULL;
|
|
union in_addr_union ip;
|
|
|
|
r = extract_first_word(&p, &n, NULL, 0);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse NDISC deny-listed prefix, ignoring assignment: %s",
|
|
rvalue);
|
|
return 0;
|
|
}
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
r = in_addr_from_string(AF_INET6, n, &ip);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"NDISC deny-listed prefix is invalid, ignoring assignment: %s", n);
|
|
continue;
|
|
}
|
|
|
|
if (set_contains(network->ndisc_deny_listed_prefix, &ip.in6))
|
|
continue;
|
|
|
|
a = newdup(struct in6_addr, &ip.in6, 1);
|
|
if (!a)
|
|
return log_oom();
|
|
|
|
r = set_ensure_consume(&network->ndisc_deny_listed_prefix, &in6_addr_hash_ops, TAKE_PTR(a));
|
|
if (r < 0)
|
|
return log_oom();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int config_parse_address_generation_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_free_ IPv6Token *token = NULL;
|
|
union in_addr_union buffer;
|
|
Network *network = data;
|
|
const char *p;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
assert(data);
|
|
|
|
if (isempty(rvalue)) {
|
|
network->ipv6_tokens = ordered_hashmap_free(network->ipv6_tokens);
|
|
return 0;
|
|
}
|
|
|
|
r = ipv6token_new(&token);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
if ((p = startswith(rvalue, "static:")))
|
|
token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_STATIC;
|
|
else if ((p = startswith(rvalue, "prefixstable:")))
|
|
token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE;
|
|
else {
|
|
token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_STATIC;
|
|
p = rvalue;
|
|
}
|
|
|
|
r = in_addr_from_string(AF_INET6, p, &buffer);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse IPv6 %s, ignoring: %s", lvalue, rvalue);
|
|
return 0;
|
|
}
|
|
|
|
if (in_addr_is_null(AF_INET6, &buffer)) {
|
|
log_syntax(unit, LOG_ERR, filename, line, 0,
|
|
"IPv6 %s cannot be the ANY address, ignoring: %s", lvalue, rvalue);
|
|
return 0;
|
|
}
|
|
|
|
token->prefix = buffer.in6;
|
|
|
|
r = ordered_hashmap_ensure_allocated(&network->ipv6_tokens, &ipv6_token_hash_ops);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = ordered_hashmap_put(network->ipv6_tokens, &token->prefix, token);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to store IPv6 token '%s'", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
TAKE_PTR(token);
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_start_dhcp6_client, ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client,
|
|
"Failed to parse DHCPv6Client= setting")
|
|
static const char* const ipv6_accept_ra_start_dhcp6_client_table[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX] = {
|
|
[IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO] = "no",
|
|
[IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS] = "always",
|
|
[IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES] = "yes",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES);
|