bd1957e906
Keep the expired prefix for the duration of the prefix expiration event and remove it afterwards.
716 lines
21 KiB
C
716 lines
21 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2014 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/ip6.h>
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#include <string.h>
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#include <stdbool.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include "socket-util.h"
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#include "refcnt.h"
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#include "async.h"
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#include "dhcp6-internal.h"
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#include "sd-icmp6-nd.h"
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#define ICMP6_ROUTER_SOLICITATION_INTERVAL 4 * USEC_PER_SEC
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#define ICMP6_MAX_ROUTER_SOLICITATIONS 3
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enum icmp6_nd_state {
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ICMP6_NEIGHBOR_DISCOVERY_IDLE = 0,
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ICMP6_ROUTER_SOLICITATION_SENT = 10,
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ICMP6_ROUTER_ADVERTISMENT_LISTEN = 11,
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};
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#define IP6_MIN_MTU (unsigned)1280
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#define ICMP6_ND_RECV_SIZE (IP6_MIN_MTU - sizeof(struct ip6_hdr))
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#define ICMP6_OPT_LEN_UNITS 8
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typedef struct ICMP6Prefix ICMP6Prefix;
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struct ICMP6Prefix {
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RefCount n_ref;
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LIST_FIELDS(ICMP6Prefix, prefixes);
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uint8_t len;
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sd_event_source *timeout_valid;
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struct in6_addr addr;
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};
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struct sd_icmp6_nd {
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RefCount n_ref;
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enum icmp6_nd_state state;
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sd_event *event;
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int event_priority;
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int index;
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struct ether_addr mac_addr;
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uint32_t mtu;
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ICMP6Prefix *expired_prefix;
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LIST_HEAD(ICMP6Prefix, prefixes);
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int fd;
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sd_event_source *recv;
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sd_event_source *timeout;
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int nd_sent;
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sd_icmp6_nd_callback_t callback;
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void *userdata;
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};
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#define log_icmp6_nd(p, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "ICMPv6 CLIENT: " fmt, ##__VA_ARGS__)
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static ICMP6Prefix *icmp6_prefix_unref(ICMP6Prefix *prefix) {
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if (prefix && REFCNT_DEC(prefix->n_ref) <= 0) {
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prefix->timeout_valid =
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sd_event_source_unref(prefix->timeout_valid);
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free(prefix);
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}
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return NULL;
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}
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static int icmp6_prefix_new(ICMP6Prefix **ret) {
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_cleanup_free_ ICMP6Prefix *prefix = NULL;
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assert(ret);
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prefix = new0(ICMP6Prefix, 1);
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if (!prefix)
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return -ENOMEM;
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prefix->n_ref = REFCNT_INIT;
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LIST_INIT(prefixes, prefix);
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*ret = prefix;
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prefix = NULL;
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return 0;
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}
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static void icmp6_nd_notify(sd_icmp6_nd *nd, int event)
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{
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if (nd->callback)
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nd->callback(nd, event, nd->userdata);
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}
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int sd_icmp6_nd_set_callback(sd_icmp6_nd *nd, sd_icmp6_nd_callback_t callback,
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void *userdata) {
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assert(nd);
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nd->callback = callback;
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nd->userdata = userdata;
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return 0;
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}
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int sd_icmp6_nd_set_index(sd_icmp6_nd *nd, int interface_index) {
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assert(nd);
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assert(interface_index >= -1);
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nd->index = interface_index;
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return 0;
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}
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int sd_icmp6_nd_set_mac(sd_icmp6_nd *nd, const struct ether_addr *mac_addr) {
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assert(nd);
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if (mac_addr)
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memcpy(&nd->mac_addr, mac_addr, sizeof(nd->mac_addr));
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else
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zero(nd->mac_addr);
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return 0;
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}
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int sd_icmp6_nd_attach_event(sd_icmp6_nd *nd, sd_event *event, int priority) {
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int r;
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assert_return(nd, -EINVAL);
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assert_return(!nd->event, -EBUSY);
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if (event)
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nd->event = sd_event_ref(event);
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else {
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r = sd_event_default(&nd->event);
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if (r < 0)
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return 0;
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}
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nd->event_priority = priority;
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return 0;
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}
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int sd_icmp6_nd_detach_event(sd_icmp6_nd *nd) {
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assert_return(nd, -EINVAL);
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nd->event = sd_event_unref(nd->event);
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return 0;
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}
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sd_event *sd_icmp6_nd_get_event(sd_icmp6_nd *nd) {
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assert(nd);
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return nd->event;
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}
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sd_icmp6_nd *sd_icmp6_nd_ref(sd_icmp6_nd *nd) {
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assert (nd);
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assert_se(REFCNT_INC(nd->n_ref) >= 2);
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return nd;
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}
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static int icmp6_nd_init(sd_icmp6_nd *nd) {
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assert(nd);
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nd->recv = sd_event_source_unref(nd->recv);
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nd->fd = asynchronous_close(nd->fd);
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nd->timeout = sd_event_source_unref(nd->timeout);
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return 0;
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}
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sd_icmp6_nd *sd_icmp6_nd_unref(sd_icmp6_nd *nd) {
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if (nd && REFCNT_DEC(nd->n_ref) == 0) {
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ICMP6Prefix *prefix, *p;
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icmp6_nd_init(nd);
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sd_icmp6_nd_detach_event(nd);
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LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
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LIST_REMOVE(prefixes, nd->prefixes, prefix);
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prefix = icmp6_prefix_unref(prefix);
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}
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free(nd);
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}
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return NULL;
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(sd_icmp6_nd*, sd_icmp6_nd_unref);
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#define _cleanup_sd_icmp6_nd_free_ _cleanup_(sd_icmp6_nd_unrefp)
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int sd_icmp6_nd_new(sd_icmp6_nd **ret) {
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_cleanup_sd_icmp6_nd_free_ sd_icmp6_nd *nd = NULL;
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assert(ret);
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nd = new0(sd_icmp6_nd, 1);
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if (!nd)
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return -ENOMEM;
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nd->n_ref = REFCNT_INIT;
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nd->index = -1;
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nd->fd = -1;
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LIST_HEAD_INIT(nd->prefixes);
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*ret = nd;
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nd = NULL;
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return 0;
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}
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int sd_icmp6_ra_get_mtu(sd_icmp6_nd *nd, uint32_t *mtu) {
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assert_return(nd, -EINVAL);
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assert_return(mtu, -EINVAL);
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if (nd->mtu == 0)
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return -ENOMSG;
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*mtu = nd->mtu;
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return 0;
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}
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static int icmp6_ra_prefix_timeout(sd_event_source *s, uint64_t usec,
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void *userdata) {
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sd_icmp6_nd *nd = userdata;
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ICMP6Prefix *prefix, *p;
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assert(nd);
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LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
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if (prefix->timeout_valid != s)
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continue;
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log_icmp6_nd(nd, "Prefix expired "SD_ICMP6_ADDRESS_FORMAT_STR"/%d",
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SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
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prefix->len);
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LIST_REMOVE(prefixes, nd->prefixes, prefix);
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nd->expired_prefix = prefix;
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icmp6_nd_notify(nd,
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ICMP6_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED);
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nd->expired_prefix = NULL;
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prefix = icmp6_prefix_unref(prefix);
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break;
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}
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return 0;
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}
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static int icmp6_ra_prefix_set_timeout(sd_icmp6_nd *nd,
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ICMP6Prefix *prefix,
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usec_t valid) {
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usec_t time_now;
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int r;
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assert_return(prefix, -EINVAL);
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r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
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if (r < 0)
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return r;
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prefix->timeout_valid = sd_event_source_unref(prefix->timeout_valid);
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r = sd_event_add_time(nd->event, &prefix->timeout_valid,
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clock_boottime_or_monotonic(), time_now + valid,
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USEC_PER_SEC, icmp6_ra_prefix_timeout, nd);
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if (r < 0)
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goto error;
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r = sd_event_source_set_priority(prefix->timeout_valid,
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nd->event_priority);
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if (r < 0)
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goto error;
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r = sd_event_source_set_description(prefix->timeout_valid,
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"icmp6-prefix-timeout");
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error:
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if (r < 0)
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prefix->timeout_valid =
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sd_event_source_unref(prefix->timeout_valid);
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return r;
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}
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static int icmp6_prefix_match(const struct in6_addr *prefix, uint8_t prefixlen,
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const struct in6_addr *addr,
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uint8_t addr_prefixlen) {
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uint8_t bytes, mask, len;
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assert_return(prefix, -EINVAL);
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assert_return(addr, -EINVAL);
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len = MIN(prefixlen, addr_prefixlen);
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bytes = len / 8;
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mask = 0xff << (8 - len % 8);
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if (memcmp(prefix, addr, bytes) != 0 ||
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(prefix->s6_addr[bytes] & mask) != (addr->s6_addr[bytes] & mask))
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return -EADDRNOTAVAIL;
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return 0;
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}
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static int icmp6_ra_prefix_match(ICMP6Prefix *head, const struct in6_addr *addr,
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uint8_t addr_len, ICMP6Prefix **result) {
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ICMP6Prefix *prefix;
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LIST_FOREACH(prefixes, prefix, head) {
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if (icmp6_prefix_match(&prefix->addr, prefix->len, addr,
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addr_len) >= 0) {
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*result = prefix;
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return 0;
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}
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}
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return -EADDRNOTAVAIL;
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}
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int sd_icmp6_prefix_match(struct in6_addr *prefix, uint8_t prefixlen,
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struct in6_addr *addr) {
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return icmp6_prefix_match(prefix, prefixlen, addr,
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sizeof(addr->s6_addr) * 8);
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}
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int sd_icmp6_ra_get_prefixlen(sd_icmp6_nd *nd, const struct in6_addr *addr,
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uint8_t *prefixlen) {
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int r;
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ICMP6Prefix *prefix;
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assert_return(nd, -EINVAL);
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assert_return(addr, -EINVAL);
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assert_return(prefixlen, -EINVAL);
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r = icmp6_ra_prefix_match(nd->prefixes, addr,
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sizeof(addr->s6_addr) * 8, &prefix);
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if (r < 0)
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return r;
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*prefixlen = prefix->len;
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return 0;
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}
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int sd_icmp6_ra_get_expired_prefix(sd_icmp6_nd *nd, struct in6_addr **addr,
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uint8_t *prefixlen)
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{
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assert_return(nd, -EINVAL);
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assert_return(addr, -EINVAL);
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assert_return(prefixlen, -EINVAL);
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if (!nd->expired_prefix)
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return -EADDRNOTAVAIL;
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*addr = &nd->expired_prefix->addr;
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*prefixlen = nd->expired_prefix->len;
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return 0;
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}
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static int icmp6_ra_prefix_update(sd_icmp6_nd *nd, ssize_t len,
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const struct nd_opt_prefix_info *prefix_opt) {
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int r;
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ICMP6Prefix *prefix;
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uint32_t lifetime;
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char time_string[FORMAT_TIMESPAN_MAX];
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assert_return(nd, -EINVAL);
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assert_return(prefix_opt, -EINVAL);
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if (len < prefix_opt->nd_opt_pi_len)
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return -ENOMSG;
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if (!(prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK))
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return 0;
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lifetime = be32toh(prefix_opt->nd_opt_pi_valid_time);
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r = icmp6_ra_prefix_match(nd->prefixes,
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&prefix_opt->nd_opt_pi_prefix,
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prefix_opt->nd_opt_pi_prefix_len, &prefix);
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if (r < 0 && r != -EADDRNOTAVAIL)
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return r;
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/* if router advertisment prefix valid timeout is zero, the timeout
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callback will be called immediately to clean up the prefix */
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if (r == -EADDRNOTAVAIL) {
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r = icmp6_prefix_new(&prefix);
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if (r < 0)
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return r;
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prefix->len = prefix_opt->nd_opt_pi_prefix_len;
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memcpy(&prefix->addr, &prefix_opt->nd_opt_pi_prefix,
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sizeof(prefix->addr));
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log_icmp6_nd(nd, "New prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
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SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
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prefix->len, lifetime,
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format_timespan(time_string, FORMAT_TIMESPAN_MAX,
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lifetime * USEC_PER_SEC, 0));
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LIST_PREPEND(prefixes, nd->prefixes, prefix);
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} else {
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if (prefix->len != prefix_opt->nd_opt_pi_prefix_len) {
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uint8_t prefixlen;
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prefixlen = MIN(prefix->len, prefix_opt->nd_opt_pi_prefix_len);
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log_icmp6_nd(nd, "Prefix length mismatch %d/%d using %d",
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prefix->len,
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prefix_opt->nd_opt_pi_prefix_len,
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prefixlen);
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prefix->len = prefixlen;
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}
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log_icmp6_nd(nd, "Update prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
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SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
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prefix->len, lifetime,
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format_timespan(time_string, FORMAT_TIMESPAN_MAX,
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lifetime * USEC_PER_SEC, 0));
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}
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r = icmp6_ra_prefix_set_timeout(nd, prefix, lifetime * USEC_PER_SEC);
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return r;
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}
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static int icmp6_ra_parse(sd_icmp6_nd *nd, struct nd_router_advert *ra,
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ssize_t len) {
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void *opt;
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struct nd_opt_hdr *opt_hdr;
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assert_return(nd, -EINVAL);
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assert_return(ra, -EINVAL);
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len -= sizeof(*ra);
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if (len < ICMP6_OPT_LEN_UNITS) {
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log_icmp6_nd(nd, "Router Advertisement below minimum length");
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return -ENOMSG;
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}
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opt = ra + 1;
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opt_hdr = opt;
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while (len != 0 && len >= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS) {
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struct nd_opt_mtu *opt_mtu;
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uint32_t mtu;
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struct nd_opt_prefix_info *opt_prefix;
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if (opt_hdr->nd_opt_len == 0)
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return -ENOMSG;
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switch (opt_hdr->nd_opt_type) {
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case ND_OPT_MTU:
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opt_mtu = opt;
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mtu = be32toh(opt_mtu->nd_opt_mtu_mtu);
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if (mtu != nd->mtu) {
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nd->mtu = MAX(mtu, IP6_MIN_MTU);
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log_icmp6_nd(nd, "Router Advertisement link MTU %d using %d",
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mtu, nd->mtu);
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}
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break;
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case ND_OPT_PREFIX_INFORMATION:
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opt_prefix = opt;
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icmp6_ra_prefix_update(nd, len, opt_prefix);
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break;
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}
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len -= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS;
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opt = (void *)((char *)opt +
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opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS);
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opt_hdr = opt;
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}
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if (len > 0)
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log_icmp6_nd(nd, "Router Advertisement contains %zd bytes of trailing garbage", len);
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return 0;
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}
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static int icmp6_router_advertisment_recv(sd_event_source *s, int fd,
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uint32_t revents, void *userdata)
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{
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sd_icmp6_nd *nd = userdata;
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int r, buflen = 0;
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ssize_t len;
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_cleanup_free_ struct nd_router_advert *ra = NULL;
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int event = ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE;
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assert(s);
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assert(nd);
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assert(nd->event);
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r = ioctl(fd, FIONREAD, &buflen);
|
|
if (r < 0 || buflen <= 0)
|
|
buflen = ICMP6_ND_RECV_SIZE;
|
|
|
|
ra = malloc(buflen);
|
|
if (!ra)
|
|
return -ENOMEM;
|
|
|
|
len = read(fd, ra, buflen);
|
|
if (len < 0) {
|
|
log_icmp6_nd(nd, "Could not receive message from UDP socket: %m");
|
|
return 0;
|
|
}
|
|
|
|
if (ra->nd_ra_type != ND_ROUTER_ADVERT)
|
|
return 0;
|
|
|
|
if (ra->nd_ra_code != 0)
|
|
return 0;
|
|
|
|
nd->timeout = sd_event_source_unref(nd->timeout);
|
|
|
|
nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
|
|
|
|
if (ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER )
|
|
event = ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER;
|
|
|
|
if (ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
|
|
event = ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED;
|
|
|
|
log_icmp6_nd(nd, "Received Router Advertisement flags %s/%s",
|
|
ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED? "MANAGED": "none",
|
|
ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER? "OTHER": "none");
|
|
|
|
if (event != ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE) {
|
|
r = icmp6_ra_parse(nd, ra, len);
|
|
if (r < 0) {
|
|
log_icmp6_nd(nd, "Could not parse Router Advertisement: %s",
|
|
strerror(-r));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
icmp6_nd_notify(nd, event);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int icmp6_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
|
|
void *userdata)
|
|
{
|
|
sd_icmp6_nd *nd = userdata;
|
|
uint64_t time_now, next_timeout;
|
|
struct ether_addr unset = { };
|
|
struct ether_addr *addr = NULL;
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(nd);
|
|
assert(nd->event);
|
|
|
|
nd->timeout = sd_event_source_unref(nd->timeout);
|
|
|
|
if (nd->nd_sent >= ICMP6_MAX_ROUTER_SOLICITATIONS) {
|
|
icmp6_nd_notify(nd, ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT);
|
|
nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
|
|
} else {
|
|
if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr)))
|
|
addr = &nd->mac_addr;
|
|
|
|
r = dhcp_network_icmp6_send_router_solicitation(nd->fd, addr);
|
|
if (r < 0)
|
|
log_icmp6_nd(nd, "Error sending Router Solicitation");
|
|
else {
|
|
nd->state = ICMP6_ROUTER_SOLICITATION_SENT;
|
|
log_icmp6_nd(nd, "Sent Router Solicitation");
|
|
}
|
|
|
|
nd->nd_sent++;
|
|
|
|
r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
|
|
if (r < 0) {
|
|
icmp6_nd_notify(nd, r);
|
|
return 0;
|
|
}
|
|
|
|
next_timeout = time_now + ICMP6_ROUTER_SOLICITATION_INTERVAL;
|
|
|
|
r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
|
|
next_timeout, 0,
|
|
icmp6_router_solicitation_timeout, nd);
|
|
if (r < 0) {
|
|
icmp6_nd_notify(nd, r);
|
|
return 0;
|
|
}
|
|
|
|
r = sd_event_source_set_priority(nd->timeout,
|
|
nd->event_priority);
|
|
if (r < 0) {
|
|
icmp6_nd_notify(nd, r);
|
|
return 0;
|
|
}
|
|
|
|
r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
|
|
if (r < 0) {
|
|
icmp6_nd_notify(nd, r);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_icmp6_nd_stop(sd_icmp6_nd *nd) {
|
|
assert_return(nd, -EINVAL);
|
|
assert_return(nd->event, -EINVAL);
|
|
|
|
log_icmp6_nd(client, "Stop ICMPv6");
|
|
|
|
icmp6_nd_init(nd);
|
|
|
|
nd->state = ICMP6_NEIGHBOR_DISCOVERY_IDLE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd) {
|
|
int r;
|
|
|
|
assert(nd);
|
|
assert(nd->event);
|
|
|
|
if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE)
|
|
return -EINVAL;
|
|
|
|
if (nd->index < 1)
|
|
return -EINVAL;
|
|
|
|
r = dhcp_network_icmp6_bind_router_solicitation(nd->index);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
nd->fd = r;
|
|
|
|
r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN,
|
|
icmp6_router_advertisment_recv, nd);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
r = sd_event_source_set_priority(nd->recv, nd->event_priority);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
r = sd_event_source_set_description(nd->recv, "icmp6-receive-message");
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
|
|
0, 0, icmp6_router_solicitation_timeout, nd);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
r = sd_event_source_set_priority(nd->timeout, nd->event_priority);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
|
|
error:
|
|
if (r < 0)
|
|
icmp6_nd_init(nd);
|
|
else
|
|
log_icmp6_nd(client, "Start Router Solicitation");
|
|
|
|
return r;
|
|
}
|