e9c6da3868
Add Router Advertisement Recursive DNS Server information as specified in RFC 8106.
698 lines
20 KiB
C
698 lines
20 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2017 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/icmp6.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <linux/in6.h>
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#include "sd-radv.h"
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#include "macro.h"
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "icmp6-util.h"
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#include "in-addr-util.h"
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#include "radv-internal.h"
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#include "socket-util.h"
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#include "string-util.h"
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#include "util.h"
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#include "random-util.h"
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_public_ int sd_radv_new(sd_radv **ret) {
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_cleanup_(sd_radv_unrefp) sd_radv *ra = NULL;
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assert_return(ret, -EINVAL);
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ra = new0(sd_radv, 1);
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if (!ra)
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return -ENOMEM;
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ra->n_ref = 1;
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ra->fd = -1;
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LIST_HEAD_INIT(ra->prefixes);
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*ret = ra;
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ra = NULL;
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return 0;
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}
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_public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) {
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int r;
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assert_return(ra, -EINVAL);
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assert_return(!ra->event, -EBUSY);
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if (event)
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ra->event = sd_event_ref(event);
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else {
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r = sd_event_default(&ra->event);
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if (r < 0)
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return 0;
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}
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ra->event_priority = priority;
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return 0;
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}
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_public_ int sd_radv_detach_event(sd_radv *ra) {
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assert_return(ra, -EINVAL);
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ra->event = sd_event_unref(ra->event);
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return 0;
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}
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_public_ sd_event *sd_radv_get_event(sd_radv *ra) {
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assert_return(ra, NULL);
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return ra->event;
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}
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static void radv_reset(sd_radv *ra) {
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ra->timeout_event_source =
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sd_event_source_unref(ra->timeout_event_source);
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ra->recv_event_source =
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sd_event_source_unref(ra->recv_event_source);
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ra->ra_sent = 0;
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}
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_public_ sd_radv *sd_radv_ref(sd_radv *ra) {
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if (!ra)
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return NULL;
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assert(ra->n_ref > 0);
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ra->n_ref++;
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return ra;
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}
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_public_ sd_radv *sd_radv_unref(sd_radv *ra) {
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if (!ra)
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return NULL;
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assert(ra->n_ref > 0);
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ra->n_ref--;
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if (ra->n_ref > 0)
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return NULL;
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while (ra->prefixes) {
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sd_radv_prefix *p = ra->prefixes;
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LIST_REMOVE(prefix, ra->prefixes, p);
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sd_radv_prefix_unref(p);
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}
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free(ra->rdnss);
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radv_reset(ra);
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sd_radv_detach_event(ra);
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return mfree(ra);
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}
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static int radv_send(sd_radv *ra, const struct in6_addr *dst,
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const uint32_t router_lifetime) {
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static const struct ether_addr mac_zero = {};
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sd_radv_prefix *p;
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struct sockaddr_in6 dst_addr = {
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.sin6_family = AF_INET6,
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.sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT,
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};
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struct nd_router_advert adv = {};
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struct {
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struct nd_opt_hdr opthdr;
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struct ether_addr slladdr;
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} _packed_ opt_mac = {
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.opthdr = {
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.nd_opt_type = ND_OPT_SOURCE_LINKADDR,
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.nd_opt_len = (sizeof(struct nd_opt_hdr) +
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sizeof(struct ether_addr) - 1) /8 + 1,
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},
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};
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struct nd_opt_mtu opt_mtu = {
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.nd_opt_mtu_type = ND_OPT_MTU,
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.nd_opt_mtu_len = 1,
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};
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/* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS */
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struct iovec iov[4 + ra->n_prefixes];
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struct msghdr msg = {
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.msg_name = &dst_addr,
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.msg_namelen = sizeof(dst_addr),
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.msg_iov = iov,
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};
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if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst))
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dst_addr.sin6_addr = *dst;
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adv.nd_ra_type = ND_ROUTER_ADVERT;
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adv.nd_ra_curhoplimit = ra->hop_limit;
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adv.nd_ra_flags_reserved = ra->flags;
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adv.nd_ra_router_lifetime = htobe16(router_lifetime);
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iov[msg.msg_iovlen].iov_base = &adv;
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iov[msg.msg_iovlen].iov_len = sizeof(adv);
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msg.msg_iovlen++;
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/* MAC address is optional, either because the link does not use L2
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addresses or load sharing is desired. See RFC 4861, Section 4.2 */
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if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) {
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opt_mac.slladdr = ra->mac_addr;
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iov[msg.msg_iovlen].iov_base = &opt_mac;
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iov[msg.msg_iovlen].iov_len = sizeof(opt_mac);
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msg.msg_iovlen++;
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}
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if (ra->mtu) {
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opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu);
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iov[msg.msg_iovlen].iov_base = &opt_mtu;
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iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu);
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msg.msg_iovlen++;
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}
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LIST_FOREACH(prefix, p, ra->prefixes) {
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iov[msg.msg_iovlen].iov_base = &p->opt;
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iov[msg.msg_iovlen].iov_len = sizeof(p->opt);
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msg.msg_iovlen++;
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}
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if (ra->rdnss) {
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iov[msg.msg_iovlen].iov_base = ra->rdnss;
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iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8;
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msg.msg_iovlen++;
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}
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if (sendmsg(ra->fd, &msg, 0) < 0)
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return -errno;
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return 0;
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}
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static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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sd_radv *ra = userdata;
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_cleanup_free_ char *addr = NULL;
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struct in6_addr src;
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triple_timestamp timestamp;
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int r;
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ssize_t buflen;
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_cleanup_free_ char *buf = NULL;
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assert(s);
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assert(ra);
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assert(ra->event);
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buflen = next_datagram_size_fd(fd);
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if ((unsigned) buflen < sizeof(struct nd_router_solicit))
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return log_radv("Too short packet received");
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buf = new0(char, buflen);
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if (!buf)
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return 0;
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r = icmp6_receive(fd, buf, buflen, &src, ×tamp);
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if (r < 0) {
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switch (r) {
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case -EADDRNOTAVAIL:
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(void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr);
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log_radv("Received RS from non-link-local address %s. Ignoring", addr);
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break;
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case -EMULTIHOP:
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log_radv("Received RS with invalid hop limit. Ignoring.");
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break;
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case -EPFNOSUPPORT:
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log_radv("Received invalid source address from ICMPv6 socket. Ignoring.");
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break;
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default:
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log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m");
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break;
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}
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return 0;
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}
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(void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr);
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r = radv_send(ra, &src, ra->lifetime);
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if (r < 0)
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log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr);
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else
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log_radv("Sent solicited Router Advertisement to %s", addr);
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return 0;
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}
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static usec_t radv_compute_timeout(usec_t min, usec_t max) {
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assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC);
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return min + (random_u32() % (max - min));
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}
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static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
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int r;
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sd_radv *ra = userdata;
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usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC;
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usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC;
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usec_t time_now, timeout;
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char time_string[FORMAT_TIMESPAN_MAX];
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assert(s);
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assert(ra);
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assert(ra->event);
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ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source);
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r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now);
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if (r < 0)
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goto fail;
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r = radv_send(ra, NULL, ra->lifetime);
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if (r < 0)
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log_radv_warning_errno(r, "Unable to send Router Advertisement: %m");
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/* RFC 4861, Section 6.2.4, sending initial Router Advertisements */
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if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) {
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max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC;
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min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3;
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}
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timeout = radv_compute_timeout(min_timeout, max_timeout);
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log_radv("Next Router Advertisement in %s",
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format_timespan(time_string, FORMAT_TIMESPAN_MAX,
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timeout, USEC_PER_SEC));
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r = sd_event_add_time(ra->event, &ra->timeout_event_source,
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clock_boottime_or_monotonic(),
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time_now + timeout, MSEC_PER_SEC,
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radv_timeout, ra);
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if (r < 0)
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goto fail;
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r = sd_event_source_set_priority(ra->timeout_event_source,
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ra->event_priority);
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if (r < 0)
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goto fail;
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r = sd_event_source_set_description(ra->timeout_event_source,
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"radv-timeout");
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if (r < 0)
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goto fail;
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ra->ra_sent++;
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fail:
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if (r < 0)
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sd_radv_stop(ra);
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return 0;
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}
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_public_ int sd_radv_stop(sd_radv *ra) {
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int r;
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assert_return(ra, -EINVAL);
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log_radv("Stopping IPv6 Router Advertisement daemon");
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/* RFC 4861, Section 6.2.5, send at least one Router Advertisement
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with zero lifetime */
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r = radv_send(ra, NULL, 0);
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if (r < 0)
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log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m");
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radv_reset(ra);
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ra->fd = safe_close(ra->fd);
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ra->state = SD_RADV_STATE_IDLE;
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return 0;
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}
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_public_ int sd_radv_start(sd_radv *ra) {
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int r = 0;
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assert_return(ra, -EINVAL);
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assert_return(ra->event, -EINVAL);
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assert_return(ra->ifindex > 0, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return 0;
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r = sd_event_add_time(ra->event, &ra->timeout_event_source,
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clock_boottime_or_monotonic(), 0, 0,
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radv_timeout, ra);
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if (r < 0)
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goto fail;
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r = sd_event_source_set_priority(ra->timeout_event_source,
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ra->event_priority);
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if (r < 0)
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goto fail;
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(void) sd_event_source_set_description(ra->timeout_event_source,
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"radv-timeout");
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r = icmp6_bind_router_advertisement(ra->ifindex);
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if (r < 0)
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goto fail;
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ra->fd = r;
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r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra);
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if (r < 0)
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goto fail;
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r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority);
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if (r < 0)
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goto fail;
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(void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message");
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ra->state = SD_RADV_STATE_ADVERTISING;
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log_radv("Started IPv6 Router Advertisement daemon");
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return 0;
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fail:
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radv_reset(ra);
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return r;
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}
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_public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) {
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assert_return(ra, -EINVAL);
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assert_return(ifindex >= -1, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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ra->ifindex = ifindex;
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return 0;
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}
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_public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) {
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assert_return(ra, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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if (mac_addr)
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ra->mac_addr = *mac_addr;
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else
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zero(ra->mac_addr);
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return 0;
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}
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_public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) {
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assert_return(ra, -EINVAL);
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assert_return(mtu >= 1280, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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ra->mtu = mtu;
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return 0;
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}
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_public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) {
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assert_return(ra, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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ra->hop_limit = hop_limit;
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return 0;
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}
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_public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) {
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assert_return(ra, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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/* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the
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preference value MUST be set to (00) by the sender..." */
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if (router_lifetime == 0 &&
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(ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3))
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return -ETIME;
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ra->lifetime = router_lifetime;
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return 0;
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}
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_public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) {
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assert_return(ra, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed);
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return 0;
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}
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_public_ int sd_radv_set_other_information(sd_radv *ra, int other) {
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assert_return(ra, -EINVAL);
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if (ra->state != SD_RADV_STATE_IDLE)
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return -EBUSY;
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SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other);
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return 0;
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}
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_public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) {
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int r = 0;
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assert_return(ra, -EINVAL);
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assert_return(IN_SET(preference,
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SD_NDISC_PREFERENCE_LOW,
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SD_NDISC_PREFERENCE_MEDIUM,
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SD_NDISC_PREFERENCE_HIGH), -EINVAL);
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ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3);
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return r;
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}
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_public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p) {
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sd_radv_prefix *cur;
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_cleanup_free_ char *addr_p = NULL;
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assert_return(ra, -EINVAL);
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if (!p)
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return -EINVAL;
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LIST_FOREACH(prefix, cur, ra->prefixes) {
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int r;
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r = in_addr_prefix_intersect(AF_INET6,
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(union in_addr_union*) &cur->opt.in6_addr,
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cur->opt.prefixlen,
|
|
(union in_addr_union*) &p->opt.in6_addr,
|
|
p->opt.prefixlen);
|
|
if (r > 0) {
|
|
_cleanup_free_ char *addr_cur = NULL;
|
|
|
|
(void) in_addr_to_string(AF_INET6,
|
|
(union in_addr_union*) &cur->opt.in6_addr,
|
|
&addr_cur);
|
|
(void) in_addr_to_string(AF_INET6,
|
|
(union in_addr_union*) &p->opt.in6_addr,
|
|
&addr_p);
|
|
|
|
log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u",
|
|
addr_cur, cur->opt.prefixlen,
|
|
addr_p, p->opt.prefixlen);
|
|
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
p = sd_radv_prefix_ref(p);
|
|
|
|
LIST_APPEND(prefix, ra->prefixes, p);
|
|
|
|
ra->n_prefixes++;
|
|
|
|
(void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p);
|
|
log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime,
|
|
const struct in6_addr *dns, size_t n_dns) {
|
|
_cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL;
|
|
size_t len;
|
|
|
|
assert_return(ra, -EINVAL);
|
|
assert_return(n_dns < 128, -EINVAL);
|
|
|
|
if (!dns || n_dns == 0) {
|
|
ra->rdnss = mfree(ra->rdnss);
|
|
ra->n_rdnss = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns;
|
|
|
|
opt_rdnss = malloc0(len);
|
|
if (!opt_rdnss)
|
|
return -ENOMEM;
|
|
|
|
opt_rdnss->type = SD_RADV_OPT_RDNSS;
|
|
opt_rdnss->length = len / 8;
|
|
opt_rdnss->lifetime = htobe32(lifetime);
|
|
|
|
memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr));
|
|
|
|
free(ra->rdnss);
|
|
ra->rdnss = opt_rdnss;
|
|
opt_rdnss = NULL;
|
|
|
|
ra->n_rdnss = n_dns;
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_radv_prefix_new(sd_radv_prefix **ret) {
|
|
_cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
|
|
|
|
assert_return(ret, -EINVAL);
|
|
|
|
p = new0(sd_radv_prefix, 1);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
p->n_ref = 1;
|
|
|
|
p->opt.type = ND_OPT_PREFIX_INFORMATION;
|
|
p->opt.length = (sizeof(p->opt) - 1) /8 + 1;
|
|
|
|
p->opt.prefixlen = 64;
|
|
|
|
/* RFC 4861, Section 6.2.1 */
|
|
SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true);
|
|
SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true);
|
|
p->opt.preferred_lifetime = htobe32(604800);
|
|
p->opt.valid_lifetime = htobe32(2592000);
|
|
|
|
LIST_INIT(prefix, p);
|
|
|
|
*ret = p;
|
|
p = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) {
|
|
if (!p)
|
|
return NULL;
|
|
|
|
assert(p->n_ref > 0);
|
|
p->n_ref++;
|
|
|
|
return p;
|
|
}
|
|
|
|
_public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) {
|
|
if (!p)
|
|
return NULL;
|
|
|
|
assert(p->n_ref > 0);
|
|
p->n_ref--;
|
|
|
|
if (p->n_ref > 0)
|
|
return NULL;
|
|
|
|
return mfree(p);
|
|
}
|
|
|
|
_public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr,
|
|
unsigned char prefixlen) {
|
|
assert_return(p, -EINVAL);
|
|
assert_return(in6_addr, -EINVAL);
|
|
|
|
if (prefixlen < 3 || prefixlen > 128)
|
|
return -EINVAL;
|
|
|
|
if (prefixlen > 64)
|
|
/* unusual but allowed, log it */
|
|
log_radv("Unusual prefix length %d greater than 64", prefixlen);
|
|
|
|
p->opt.in6_addr = *in6_addr;
|
|
p->opt.prefixlen = prefixlen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) {
|
|
assert_return(p, -EINVAL);
|
|
|
|
SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p,
|
|
int address_autoconfiguration) {
|
|
assert_return(p, -EINVAL);
|
|
|
|
SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p,
|
|
uint32_t valid_lifetime) {
|
|
assert_return(p, -EINVAL);
|
|
|
|
p->opt.valid_lifetime = htobe32(valid_lifetime);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p,
|
|
uint32_t preferred_lifetime) {
|
|
assert_return(p, -EINVAL);
|
|
|
|
p->opt.preferred_lifetime = htobe32(preferred_lifetime);
|
|
|
|
return 0;
|
|
}
|