/* SPDX-License-Identifier: LGPL-2.1+ */
/***
- This file is part of systemd.
-
- Copyright (C) 2017 Intel Corporation. All rights reserved.
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
+ Copyright © 2017 Intel Corporation. All rights reserved.
***/
#include <netinet/icmp6.h>
#include <netinet/in.h>
#include <arpa/inet.h>
-#include <linux/in6.h>
#include "sd-radv.h"
#include "macro.h"
#include "alloc-util.h"
#include "dns-domain.h"
+#include "ether-addr-util.h"
+#include "event-util.h"
#include "fd-util.h"
#include "icmp6-util.h"
#include "in-addr-util.h"
assert_return(ret, -EINVAL);
- ra = new0(sd_radv, 1);
+ ra = new(sd_radv, 1);
if (!ra)
return -ENOMEM;
- ra->n_ref = 1;
- ra->fd = -1;
-
- LIST_HEAD_INIT(ra->prefixes);
+ *ra = (sd_radv) {
+ .n_ref = 1,
+ .fd = -1,
+ };
- *ret = ra;
- ra = NULL;
+ *ret = TAKE_PTR(ra);
return 0;
}
}
static void radv_reset(sd_radv *ra) {
+ assert(ra);
- ra->timeout_event_source =
- sd_event_source_unref(ra->timeout_event_source);
+ (void) event_source_disable(ra->timeout_event_source);
ra->recv_event_source =
sd_event_source_unref(ra->recv_event_source);
ra->ra_sent = 0;
}
-_public_ sd_radv *sd_radv_ref(sd_radv *ra) {
- if (!ra)
- return NULL;
-
- assert(ra->n_ref > 0);
- ra->n_ref++;
-
- return ra;
-}
-
-_public_ sd_radv *sd_radv_unref(sd_radv *ra) {
+static sd_radv *radv_free(sd_radv *ra) {
if (!ra)
return NULL;
- assert(ra->n_ref > 0);
- ra->n_ref--;
-
- if (ra->n_ref > 0)
- return NULL;
-
while (ra->prefixes) {
sd_radv_prefix *p = ra->prefixes;
free(ra->rdnss);
free(ra->dnssl);
+ ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source);
+
radv_reset(ra);
sd_radv_detach_event(ra);
+
+ ra->fd = safe_close(ra->fd);
+
return mfree(ra);
}
-static int radv_send(sd_radv *ra, const struct in6_addr *dst,
- const uint32_t router_lifetime) {
- static const struct ether_addr mac_zero = {};
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free);
+
+static int radv_send(sd_radv *ra, const struct in6_addr *dst, uint32_t router_lifetime) {
sd_radv_prefix *p;
struct sockaddr_in6 dst_addr = {
.sin6_family = AF_INET6,
.msg_namelen = sizeof(dst_addr),
.msg_iov = iov,
};
+ usec_t time_now;
+ int r;
+
+ assert(ra);
- if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst))
+ r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ return r;
+
+ if (dst && !IN6_IS_ADDR_UNSPECIFIED(dst))
dst_addr.sin6_addr = *dst;
adv.nd_ra_type = ND_ROUTER_ADVERT;
/* MAC address is optional, either because the link does not use L2
addresses or load sharing is desired. See RFC 4861, Section 4.2 */
- if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) {
+ if (!ether_addr_is_null(&ra->mac_addr)) {
opt_mac.slladdr = ra->mac_addr;
iov[msg.msg_iovlen].iov_base = &opt_mac;
iov[msg.msg_iovlen].iov_len = sizeof(opt_mac);
}
LIST_FOREACH(prefix, p, ra->prefixes) {
+ if (p->valid_until) {
+
+ if (time_now > p->valid_until)
+ p->opt.valid_lifetime = 0;
+ else
+ p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC);
+
+ if (time_now > p->preferred_until)
+ p->opt.preferred_lifetime = 0;
+ else
+ p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC);
+ }
iov[msg.msg_iovlen].iov_base = &p->opt;
iov[msg.msg_iovlen].iov_len = sizeof(p->opt);
msg.msg_iovlen++;
log_radv("Received invalid source address from ICMPv6 socket. Ignoring.");
break;
+ case -EAGAIN: /* ignore spurious wakeups */
+ break;
+
default:
- log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m");
+ log_radv_errno(r, "Unexpected error receiving from ICMPv6 socket: %m");
break;
}
r = radv_send(ra, &src, ra->lifetime);
if (r < 0)
- log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr);
+ log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", addr);
else
log_radv("Sent solicited Router Advertisement to %s", addr);
assert(ra);
assert(ra->event);
- ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source);
-
r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
goto fail;
r = radv_send(ra, NULL, ra->lifetime);
if (r < 0)
- log_radv_warning_errno(r, "Unable to send Router Advertisement: %m");
+ log_radv_errno(r, "Unable to send Router Advertisement: %m");
/* RFC 4861, Section 6.2.4, sending initial Router Advertisements */
if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) {
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
timeout, USEC_PER_SEC));
- r = sd_event_add_time(ra->event, &ra->timeout_event_source,
- clock_boottime_or_monotonic(),
- time_now + timeout, MSEC_PER_SEC,
- radv_timeout, ra);
- if (r < 0)
- goto fail;
-
- r = sd_event_source_set_priority(ra->timeout_event_source,
- ra->event_priority);
- if (r < 0)
- goto fail;
-
- r = sd_event_source_set_description(ra->timeout_event_source,
- "radv-timeout");
+ r = event_reset_time(ra->event, &ra->timeout_event_source,
+ clock_boottime_or_monotonic(),
+ time_now + timeout, MSEC_PER_SEC,
+ radv_timeout, ra,
+ ra->event_priority, "radv-timeout", true);
if (r < 0)
goto fail;
ra->ra_sent++;
+ return 0;
+
fail:
- if (r < 0)
- sd_radv_stop(ra);
+ sd_radv_stop(ra);
return 0;
}
assert_return(ra, -EINVAL);
+ if (ra->state == SD_RADV_STATE_IDLE)
+ return 0;
+
log_radv("Stopping IPv6 Router Advertisement daemon");
/* RFC 4861, Section 6.2.5, send at least one Router Advertisement
with zero lifetime */
r = radv_send(ra, NULL, 0);
if (r < 0)
- log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m");
+ log_radv_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m");
radv_reset(ra);
ra->fd = safe_close(ra->fd);
if (ra->state != SD_RADV_STATE_IDLE)
return 0;
- r = sd_event_add_time(ra->event, &ra->timeout_event_source,
- clock_boottime_or_monotonic(), 0, 0,
- radv_timeout, ra);
- if (r < 0)
- goto fail;
-
- r = sd_event_source_set_priority(ra->timeout_event_source,
- ra->event_priority);
+ r = event_reset_time(ra->event, &ra->timeout_event_source,
+ clock_boottime_or_monotonic(),
+ 0, 0,
+ radv_timeout, ra,
+ ra->event_priority, "radv-timeout", true);
if (r < 0)
goto fail;
- (void) sd_event_source_set_description(ra->timeout_event_source,
- "radv-timeout");
-
r = icmp6_bind_router_advertisement(ra->ifindex);
if (r < 0)
goto fail;
assert_return(ra, -EINVAL);
assert_return(mtu >= 1280, -EINVAL);
- if (ra->state != SD_RADV_STATE_IDLE)
- return -EBUSY;
-
ra->mtu = mtu;
return 0;
return r;
}
-_public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p) {
+_public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) {
sd_radv_prefix *cur;
+ int r;
_cleanup_free_ char *addr_p = NULL;
+ char time_string_preferred[FORMAT_TIMESPAN_MAX];
+ char time_string_valid[FORMAT_TIMESPAN_MAX];
+ usec_t time_now, valid, preferred, valid_until, preferred_until;
assert_return(ra, -EINVAL);
return -EINVAL;
LIST_FOREACH(prefix, cur, ra->prefixes) {
- int r;
r = in_addr_prefix_intersect(AF_INET6,
(union in_addr_union*) &cur->opt.in6_addr,
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);
+ if (dynamic && cur->opt.prefixlen == p->opt.prefixlen)
+ goto update;
+
+ (void) in_addr_to_string(AF_INET6,
+ (union in_addr_union*) &cur->opt.in6_addr,
+ &addr_cur);
log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u",
addr_cur, cur->opt.prefixlen,
addr_p, p->opt.prefixlen);
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);
+
+ if (!dynamic) {
+ log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen);
+ return 0;
+ }
+
+ cur = p;
+
+ update:
+ r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ return r;
+
+ valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC;
+ valid_until = usec_add(valid, time_now);
+ if (valid_until == USEC_INFINITY)
+ return -EOVERFLOW;
+
+ preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC;
+ preferred_until = usec_add(preferred, time_now);
+ if (preferred_until == USEC_INFINITY)
+ return -EOVERFLOW;
+
+ cur->valid_until = valid_until;
+ cur->preferred_until = preferred_until;
+
+ log_radv("%s prefix %s/%u preferred %s valid %s",
+ cur? "Updated": "Added",
+ addr_p, p->opt.prefixlen,
+ format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX,
+ preferred, USEC_PER_SEC),
+ format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX,
+ valid, USEC_PER_SEC));
return 0;
}
+_public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra,
+ const struct in6_addr *prefix,
+ unsigned char prefixlen) {
+ sd_radv_prefix *cur, *next;
+
+ assert_return(ra, NULL);
+ assert_return(prefix, NULL);
+
+ LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) {
+ if (prefixlen != cur->opt.prefixlen)
+ continue;
+
+ if (!in_addr_equal(AF_INET6,
+ (union in_addr_union *)prefix,
+ (union in_addr_union *)&cur->opt.in6_addr))
+ continue;
+
+ LIST_REMOVE(prefix, ra->prefixes, cur);
+ ra->n_prefixes--;
+
+ break;
+ }
+
+ return cur;
+}
+
_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;
memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr));
- free(ra->rdnss);
- ra->rdnss = opt_rdnss;
- opt_rdnss = NULL;
+ free_and_replace(ra->rdnss, opt_rdnss);
ra->n_rdnss = n_dns;
assert_return(ra, -EINVAL);
- if (!search_list || *search_list == NULL) {
+ if (strv_isempty(search_list)) {
ra->dnssl = mfree(ra->dnssl);
-
return 0;
}
len -= r;
}
- free(ra->dnssl);
- ra->dnssl = opt_dnssl;
- opt_dnssl = NULL;
+ free_and_replace(ra->dnssl, opt_dnssl);
return 0;
}
LIST_INIT(prefix, p);
- *ret = p;
- p = NULL;
+ *ret = TAKE_PTR(p);
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);
-}
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree);
-_public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr,
+_public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr,
unsigned char prefixlen) {
assert_return(p, -EINVAL);
assert_return(in6_addr, -EINVAL);
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