204f99d21e
Add Router Advertisement header files, data structures and core functionality that is quite similar to other parts of networkd.
398 lines
10 KiB
C
398 lines
10 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 "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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_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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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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_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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sd_radv_detach_event(ra);
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return mfree(ra);
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}
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_public_ int sd_radv_stop(sd_radv *ra) {
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assert_return(ra, -EINVAL);
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log_radv("Stopping IPv6 Router Advertisement daemon");
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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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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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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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}
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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,
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(union in_addr_union*) &p->opt.in6_addr,
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p->opt.prefixlen);
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if (r > 0) {
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_cleanup_free_ char *addr_cur = NULL;
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(void) in_addr_to_string(AF_INET6,
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(union in_addr_union*) &cur->opt.in6_addr,
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&addr_cur);
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(void) in_addr_to_string(AF_INET6,
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(union in_addr_union*) &p->opt.in6_addr,
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&addr_p);
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log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u",
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addr_cur, cur->opt.prefixlen,
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addr_p, p->opt.prefixlen);
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return -EEXIST;
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}
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}
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p = sd_radv_prefix_ref(p);
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LIST_APPEND(prefix, ra->prefixes, p);
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ra->n_prefixes++;
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(void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p);
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log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen);
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return 0;
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}
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_public_ int sd_radv_prefix_new(sd_radv_prefix **ret) {
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_cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
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assert_return(ret, -EINVAL);
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p = new0(sd_radv_prefix, 1);
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if (!p)
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return -ENOMEM;
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p->n_ref = 1;
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p->opt.type = ND_OPT_PREFIX_INFORMATION;
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p->opt.length = (sizeof(p->opt) - 1) /8 + 1;
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p->opt.prefixlen = 64;
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/* RFC 4861, Section 6.2.1 */
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SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true);
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SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true);
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p->opt.preferred_lifetime = htobe32(604800);
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p->opt.valid_lifetime = htobe32(2592000);
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LIST_INIT(prefix, p);
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*ret = p;
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p = NULL;
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return 0;
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}
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_public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) {
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if (!p)
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return NULL;
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assert(p->n_ref > 0);
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p->n_ref++;
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return p;
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}
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_public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) {
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if (!p)
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return NULL;
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assert(p->n_ref > 0);
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p->n_ref--;
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if (p->n_ref > 0)
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return NULL;
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return mfree(p);
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}
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_public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr,
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unsigned char prefixlen) {
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assert_return(p, -EINVAL);
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assert_return(in6_addr, -EINVAL);
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if (prefixlen < 3 || prefixlen > 128)
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return -EINVAL;
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if (prefixlen > 64)
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/* unusual but allowed, log it */
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log_radv("Unusual prefix length %d greater than 64", prefixlen);
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p->opt.in6_addr = *in6_addr;
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p->opt.prefixlen = prefixlen;
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return 0;
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}
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_public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) {
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assert_return(p, -EINVAL);
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SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink);
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return 0;
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}
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_public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p,
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int address_autoconfiguration) {
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assert_return(p, -EINVAL);
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SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration);
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return 0;
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}
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_public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p,
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uint32_t valid_lifetime) {
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assert_return(p, -EINVAL);
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p->opt.valid_lifetime = htobe32(valid_lifetime);
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return 0;
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}
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_public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p,
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uint32_t preferred_lifetime) {
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assert_return(p, -EINVAL);
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p->opt.preferred_lifetime = htobe32(preferred_lifetime);
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return 0;
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}
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