677 lines
23 KiB
C
677 lines
23 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-ndisc.h"
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#include "networkd-route.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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static int ndisc_netlink_message_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_messages > 0);
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link->ndisc_messages--;
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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_error_errno(link, r, "Could not set NDisc route or address: %m");
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if (link->ndisc_messages == 0) {
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link->ndisc_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_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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char buffer[INET6_ADDRSTRLEN];
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log_link_debug(link, "No NDisc route added, gateway %s matches local address",
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inet_ntop(AF_INET6,
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&address->in_addr.in6,
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buffer, sizeof(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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char buffer[INET6_ADDRSTRLEN];
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log_link_debug(link, "No NDisc route added, gateway %s matches local address",
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inet_ntop(AF_INET6,
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&address->in_addr.in6,
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buffer, sizeof(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->dhcp_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_netlink_message_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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link->ndisc_messages++;
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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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_cleanup_(address_freep) Address *address = NULL;
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Address *existing_address;
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uint32_t lifetime_valid, lifetime_preferred, lifetime_remaining;
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usec_t time_now;
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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_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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if (in_addr_is_null(AF_INET6, (const union in_addr_union *) &link->network->ipv6_token) == 0)
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memcpy(((char *)&address->in_addr.in6) + 8, ((char *)&link->network->ipv6_token) + 8, 8);
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else {
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/* see RFC4291 section 2.5.1 */
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address->in_addr.in6.s6_addr[8] = link->mac.ether_addr_octet[0];
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address->in_addr.in6.s6_addr[8] ^= 1 << 1;
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address->in_addr.in6.s6_addr[9] = link->mac.ether_addr_octet[1];
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address->in_addr.in6.s6_addr[10] = link->mac.ether_addr_octet[2];
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address->in_addr.in6.s6_addr[11] = 0xff;
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address->in_addr.in6.s6_addr[12] = 0xfe;
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address->in_addr.in6.s6_addr[13] = link->mac.ether_addr_octet[3];
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address->in_addr.in6.s6_addr[14] = link->mac.ether_addr_octet[4];
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address->in_addr.in6.s6_addr[15] = link->mac.ether_addr_octet[5];
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}
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address->prefixlen = prefixlen;
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address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
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address->cinfo.ifa_prefered = lifetime_preferred;
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/* see RFC4862 section 5.5.3.e */
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r = address_get(link, address->family, &address->in_addr, address->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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address->cinfo.ifa_valid = lifetime_valid;
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else if (lifetime_remaining <= NDISC_PREFIX_LFT_MIN)
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address->cinfo.ifa_valid = lifetime_remaining;
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else
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address->cinfo.ifa_valid = NDISC_PREFIX_LFT_MIN;
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} else if (lifetime_valid > 0)
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address->cinfo.ifa_valid = lifetime_valid;
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else
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return 0; /* see RFC4862 section 5.5.3.d */
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if (address->cinfo.ifa_valid == 0)
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return 0;
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r = address_configure(address, link, ndisc_netlink_message_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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link->ndisc_messages++;
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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->dhcp_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_netlink_message_handler);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not set prefix route: %m");
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link_enter_failed(link);
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return r;
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}
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link->ndisc_messages++;
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return 0;
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}
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static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
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_cleanup_(route_freep) Route *route = NULL;
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struct in6_addr gateway;
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uint32_t lifetime;
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unsigned preference, prefixlen;
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usec_t time_now;
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int r;
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assert(link);
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r = sd_ndisc_router_route_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)
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return 0;
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r = sd_ndisc_router_get_address(rt, &gateway);
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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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r = sd_ndisc_router_route_get_prefixlen(rt, &prefixlen);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to get route prefix length: %m");
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r = sd_ndisc_router_route_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 = 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->protocol = RTPROT_RA;
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route->pref = preference;
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route->gw.in6 = gateway;
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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_route_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 route address: %m");
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r = route_configure(route, link, ndisc_netlink_message_handler);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not set additional route: %m");
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link_enter_failed(link);
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return r;
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}
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link->ndisc_messages++;
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return 0;
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}
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static void ndisc_rdnss_hash_func(const NDiscRDNSS *x, struct siphash *state) {
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siphash24_compress(&x->address, sizeof(x->address), state);
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}
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static int ndisc_rdnss_compare_func(const NDiscRDNSS *a, const NDiscRDNSS *b) {
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return memcmp(&a->address, &b->address, sizeof(a->address));
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}
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DEFINE_PRIVATE_HASH_OPS(ndisc_rdnss_hash_ops, NDiscRDNSS, ndisc_rdnss_hash_func, ndisc_rdnss_compare_func);
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static int ndisc_router_process_rdnss(Link *link, sd_ndisc_router *rt) {
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uint32_t lifetime;
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const struct in6_addr *a;
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usec_t time_now;
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int i, n, 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_rdnss_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 RDNSS lifetime: %m");
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n = sd_ndisc_router_rdnss_get_addresses(rt, &a);
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if (n < 0)
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return log_link_warning_errno(link, n, "Failed to get RDNSS addresses: %m");
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for (i = 0; i < n; i++) {
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_cleanup_free_ NDiscRDNSS *x = NULL;
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NDiscRDNSS d = {
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.address = a[i],
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}, *y;
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if (lifetime == 0) {
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(void) set_remove(link->ndisc_rdnss, &d);
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link_dirty(link);
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continue;
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}
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y = set_get(link->ndisc_rdnss, &d);
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if (y) {
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y->valid_until = time_now + lifetime * USEC_PER_SEC;
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continue;
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}
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ndisc_vacuum(link);
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if (set_size(link->ndisc_rdnss) >= NDISC_RDNSS_MAX) {
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log_link_warning(link, "Too many RDNSS records per link, ignoring.");
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continue;
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}
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r = set_ensure_allocated(&link->ndisc_rdnss, &ndisc_rdnss_hash_ops);
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if (r < 0)
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return log_oom();
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x = new(NDiscRDNSS, 1);
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if (!x)
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return log_oom();
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*x = (NDiscRDNSS) {
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.address = a[i],
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.valid_until = time_now + lifetime * USEC_PER_SEC,
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};
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r = set_put(link->ndisc_rdnss, x);
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if (r < 0)
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return log_oom();
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TAKE_PTR(x);
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assert(r > 0);
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link_dirty(link);
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}
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return 0;
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}
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static void ndisc_dnssl_hash_func(const NDiscDNSSL *x, struct siphash *state) {
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siphash24_compress(NDISC_DNSSL_DOMAIN(x), strlen(NDISC_DNSSL_DOMAIN(x)), state);
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}
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static int ndisc_dnssl_compare_func(const NDiscDNSSL *a, const NDiscDNSSL *b) {
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return strcmp(NDISC_DNSSL_DOMAIN(a), NDISC_DNSSL_DOMAIN(b));
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}
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DEFINE_PRIVATE_HASH_OPS(ndisc_dnssl_hash_ops, NDiscDNSSL, ndisc_dnssl_hash_func, ndisc_dnssl_compare_func);
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static void ndisc_router_process_dnssl(Link *link, sd_ndisc_router *rt) {
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_cleanup_strv_free_ char **l = NULL;
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uint32_t lifetime;
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usec_t time_now;
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char **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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log_link_warning_errno(link, r, "Failed to get RA timestamp: %m");
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return;
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}
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r = sd_ndisc_router_dnssl_get_lifetime(rt, &lifetime);
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if (r < 0) {
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log_link_warning_errno(link, r, "Failed to get RDNSS lifetime: %m");
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return;
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}
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r = sd_ndisc_router_dnssl_get_domains(rt, &l);
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if (r < 0) {
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log_link_warning_errno(link, r, "Failed to get RDNSS addresses: %m");
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return;
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}
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STRV_FOREACH(i, l) {
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_cleanup_free_ NDiscDNSSL *s;
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NDiscDNSSL *x;
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s = malloc0(ALIGN(sizeof(NDiscDNSSL)) + strlen(*i) + 1);
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if (!s) {
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log_oom();
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return;
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}
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strcpy(NDISC_DNSSL_DOMAIN(s), *i);
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if (lifetime == 0) {
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(void) set_remove(link->ndisc_dnssl, s);
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link_dirty(link);
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continue;
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}
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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;
|
|
}
|
|
|
|
r = set_ensure_allocated(&link->ndisc_dnssl, &ndisc_dnssl_hash_ops);
|
|
if (r < 0) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
|
|
s->valid_until = time_now + lifetime * USEC_PER_SEC;
|
|
|
|
r = set_put(link->ndisc_dnssl, s);
|
|
if (r < 0) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
|
|
s = NULL;
|
|
assert(r > 0);
|
|
link_dirty(link);
|
|
}
|
|
}
|
|
|
|
static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) {
|
|
int r;
|
|
|
|
assert(link);
|
|
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: {
|
|
uint8_t flags;
|
|
|
|
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 = 0;
|
|
|
|
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)) {
|
|
/* (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:
|
|
(void) ndisc_router_handler(link, rt);
|
|
break;
|
|
|
|
case SD_NDISC_EVENT_TIMEOUT:
|
|
link->ndisc_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);
|
|
}
|