+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
#include "in-addr-util.h"
#include "ndisc-internal.h"
#include "ndisc-router.h"
+#include "random-util.h"
#include "socket-util.h"
#include "string-util.h"
#include "util.h"
-#define NDISC_ROUTER_SOLICITATION_INTERVAL (4U * USEC_PER_SEC)
-#define NDISC_MAX_ROUTER_SOLICITATIONS 3U
+#define NDISC_TIMEOUT_NO_RA_USEC (NDISC_ROUTER_SOLICITATION_INTERVAL * NDISC_MAX_ROUTER_SOLICITATIONS)
static void ndisc_callback(sd_ndisc *ndisc, sd_ndisc_event event, sd_ndisc_router *rt) {
assert(ndisc);
assert(nd);
nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source);
+ nd->timeout_no_ra = sd_event_source_unref(nd->timeout_no_ra);
+ nd->retransmit_time = 0;
nd->recv_event_source = sd_event_source_unref(nd->recv_event_source);
nd->fd = safe_close(nd->fd);
ndisc_reset(nd);
sd_ndisc_detach_event(nd);
- free(nd);
-
- return NULL;
+ return mfree(nd);
}
_public_ int sd_ndisc_new(sd_ndisc **ret) {
static int ndisc_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_(sd_ndisc_router_unrefp) sd_ndisc_router *rt = NULL;
sd_ndisc *nd = userdata;
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(int)) + /* ttl */
- CMSG_SPACE(sizeof(struct timeval))];
- } control = {};
- struct iovec iov = {};
- union sockaddr_union sa = {};
- struct msghdr msg = {
- .msg_name = &sa.sa,
- .msg_namelen = sizeof(sa),
- .msg_iov = &iov,
- .msg_iovlen = 1,
- .msg_control = &control,
- .msg_controllen = sizeof(control),
- };
- struct cmsghdr *cmsg;
- ssize_t len, buflen;
+ ssize_t buflen;
+ int r;
+ _cleanup_free_ char *addr = NULL;
assert(s);
assert(nd);
if (!rt)
return -ENOMEM;
- iov.iov_base = NDISC_ROUTER_RAW(rt);
- iov.iov_len = rt->raw_size;
-
- len = recvmsg(fd, &msg, MSG_DONTWAIT);
- if (len < 0) {
- if (errno == EAGAIN || errno == EINTR)
- return 0;
-
- return log_ndisc_errno(errno, "Could not receive message from ICMPv6 socket: %m");
- }
-
- if ((size_t) len != rt->raw_size) {
- log_ndisc("Packet size mismatch.");
- return -EINVAL;
- }
-
- if (msg.msg_namelen == sizeof(struct sockaddr_in6) &&
- sa.in6.sin6_family == AF_INET6) {
-
- if (in_addr_is_link_local(AF_INET6, (union in_addr_union*) &sa.in6.sin6_addr) <= 0) {
- _cleanup_free_ char *addr = NULL;
-
- (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &sa.in6.sin6_addr, &addr);
- log_ndisc("Received RA from non-link-local address %s. Ignoring.", strna(addr));
- return 0;
- }
-
- rt->address = sa.in6.sin6_addr;
-
- } else if (msg.msg_namelen > 0) {
- log_ndisc("Received invalid source address size from ICMPv6 socket: %zu bytes", (size_t) msg.msg_namelen);
- return -EINVAL;
- }
-
- /* namelen == 0 only happens when running the test-suite over a socketpair */
-
- assert(!(msg.msg_flags & MSG_CTRUNC));
- assert(!(msg.msg_flags & MSG_TRUNC));
-
- CMSG_FOREACH(cmsg, &msg) {
- if (cmsg->cmsg_level == SOL_IPV6 &&
- cmsg->cmsg_type == IPV6_HOPLIMIT &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
- int hops = *(int*) CMSG_DATA(cmsg);
-
- if (hops != 255) {
- log_ndisc("Received RA with invalid hop limit %d. Ignoring.", hops);
- return 0;
- }
+ r = icmp6_receive(fd, NDISC_ROUTER_RAW(rt), rt->raw_size, &rt->address,
+ &rt->timestamp);
+ if (r < 0) {
+ switch (r) {
+ case -EADDRNOTAVAIL:
+ (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &rt->address, &addr);
+ log_ndisc("Received RA from non-link-local address %s. Ignoring", addr);
+ break;
+
+ case -EMULTIHOP:
+ log_ndisc("Received RA with invalid hop limit. Ignoring.");
+ break;
+
+ case -EPFNOSUPPORT:
+ log_ndisc("Received invalid source address from ICMPv6 socket.");
+ break;
}
- if (cmsg->cmsg_level == SOL_SOCKET &&
- cmsg->cmsg_type == SO_TIMESTAMP &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
- triple_timestamp_from_realtime(&rt->timestamp, timeval_load((struct timeval*) CMSG_DATA(cmsg)));
+ return 0;
}
- if (!triple_timestamp_is_set(&rt->timestamp))
- triple_timestamp_get(&rt->timestamp);
-
nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source);
return ndisc_handle_datagram(nd, rt);
}
+static usec_t ndisc_timeout_compute_random(usec_t val) {
+ /* compute a time that is random within ±10% of the given value */
+ return val - val / 10 +
+ (random_u64() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC;
+}
+
static int ndisc_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
sd_ndisc *nd = userdata;
- usec_t time_now, next_timeout;
+ usec_t time_now;
int r;
+ char time_string[FORMAT_TIMESPAN_MAX];
assert(s);
assert(nd);
assert(nd->event);
- if (nd->nd_sent >= NDISC_MAX_ROUTER_SOLICITATIONS) {
- nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source);
- ndisc_callback(nd, SD_NDISC_EVENT_TIMEOUT, NULL);
- return 0;
+ assert_se(sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now) >= 0);
+
+ nd->timeout_event_source = sd_event_source_unref(nd->timeout_event_source);
+
+ if (!nd->retransmit_time)
+ nd->retransmit_time = ndisc_timeout_compute_random(NDISC_ROUTER_SOLICITATION_INTERVAL);
+ else {
+ if (nd->retransmit_time > NDISC_MAX_ROUTER_SOLICITATION_INTERVAL / 2)
+ nd->retransmit_time = ndisc_timeout_compute_random(NDISC_MAX_ROUTER_SOLICITATION_INTERVAL);
+ else
+ nd->retransmit_time += ndisc_timeout_compute_random(nd->retransmit_time);
}
- r = icmp6_send_router_solicitation(nd->fd, &nd->mac_addr);
- if (r < 0) {
- log_ndisc_errno(r, "Error sending Router Solicitation: %m");
+ r = sd_event_add_time(nd->event, &nd->timeout_event_source,
+ clock_boottime_or_monotonic(),
+ time_now + nd->retransmit_time,
+ 10 * USEC_PER_MSEC, ndisc_timeout, nd);
+ if (r < 0)
goto fail;
- }
- log_ndisc("Sent Router Solicitation");
- nd->nd_sent++;
+ r = sd_event_source_set_priority(nd->timeout_event_source, nd->event_priority);
+ if (r < 0)
+ goto fail;
- assert_se(sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now) >= 0);
- next_timeout = time_now + NDISC_ROUTER_SOLICITATION_INTERVAL;
+ (void) sd_event_source_set_description(nd->timeout_event_source, "ndisc-timeout-no-ra");
- r = sd_event_source_set_time(nd->timeout_event_source, next_timeout);
+ r = sd_event_source_set_enabled(nd->timeout_event_source, SD_EVENT_ONESHOT);
if (r < 0) {
- log_ndisc_errno(r, "Error updating timer: %m");
+ log_ndisc_errno(r, "Error reenabling timer: %m");
goto fail;
}
- r = sd_event_source_set_enabled(nd->timeout_event_source, SD_EVENT_ONESHOT);
+ r = icmp6_send_router_solicitation(nd->fd, &nd->mac_addr);
if (r < 0) {
- log_ndisc_errno(r, "Error reenabling timer: %m");
+ log_ndisc_errno(r, "Error sending Router Solicitation: %m");
goto fail;
}
+ log_ndisc("Sent Router Solicitation, next solicitation in %s",
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX,
+ nd->retransmit_time, USEC_PER_SEC));
+
return 0;
fail:
return 0;
}
+static int ndisc_timeout_no_ra(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_ndisc *nd = userdata;
+
+ assert(s);
+ assert(nd);
+
+ log_ndisc("No RA received before link confirmation timeout");
+
+ nd->timeout_no_ra = sd_event_source_unref(nd->timeout_no_ra);
+ ndisc_callback(nd, SD_NDISC_EVENT_TIMEOUT, NULL);
+
+ return 0;
+}
+
_public_ int sd_ndisc_stop(sd_ndisc *nd) {
assert_return(nd, -EINVAL);
_public_ int sd_ndisc_start(sd_ndisc *nd) {
int r;
+ usec_t time_now;
assert_return(nd, -EINVAL);
assert_return(nd->event, -EINVAL);
assert(!nd->recv_event_source);
assert(!nd->timeout_event_source);
+ r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ goto fail;
+
nd->fd = icmp6_bind_router_solicitation(nd->ifindex);
if (nd->fd < 0)
return nd->fd;
(void) sd_event_source_set_description(nd->timeout_event_source, "ndisc-timeout");
+ r = sd_event_add_time(nd->event, &nd->timeout_no_ra,
+ clock_boottime_or_monotonic(),
+ time_now + NDISC_TIMEOUT_NO_RA_USEC,
+ 10 * USEC_PER_MSEC, ndisc_timeout_no_ra, nd);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(nd->timeout_no_ra, nd->event_priority);
+ if (r < 0)
+ goto fail;
+
+ (void) sd_event_source_set_description(nd->timeout_no_ra, "ndisc-timeout-no-ra");
+
log_ndisc("Started IPv6 Router Solicitation client");
return 1;
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