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-rw-r--r--src/libsystemd-network/sd-radv.c953
1 files changed, 953 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-radv.c b/src/libsystemd-network/sd-radv.c
new file mode 100644
index 0000000..8beb845
--- /dev/null
+++ b/src/libsystemd-network/sd-radv.c
@@ -0,0 +1,953 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+ Copyright © 2017 Intel Corporation. All rights reserved.
+***/
+
+#include <netinet/icmp6.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "sd-radv.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"
+#include "io-util.h"
+#include "macro.h"
+#include "memory-util.h"
+#include "radv-internal.h"
+#include "random-util.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+_public_ int sd_radv_new(sd_radv **ret) {
+ _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL;
+
+ assert_return(ret, -EINVAL);
+
+ ra = new(sd_radv, 1);
+ if (!ra)
+ return -ENOMEM;
+
+ *ra = (sd_radv) {
+ .n_ref = 1,
+ .fd = -1,
+ };
+
+ *ret = TAKE_PTR(ra);
+
+ return 0;
+}
+
+_public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) {
+ int r;
+
+ assert_return(ra, -EINVAL);
+ assert_return(!ra->event, -EBUSY);
+
+ if (event)
+ ra->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&ra->event);
+ if (r < 0)
+ return 0;
+ }
+
+ ra->event_priority = priority;
+
+ return 0;
+}
+
+_public_ int sd_radv_detach_event(sd_radv *ra) {
+
+ assert_return(ra, -EINVAL);
+
+ ra->event = sd_event_unref(ra->event);
+ return 0;
+}
+
+_public_ sd_event *sd_radv_get_event(sd_radv *ra) {
+ assert_return(ra, NULL);
+
+ return ra->event;
+}
+
+_public_ int sd_radv_is_running(sd_radv *ra) {
+ assert_return(ra, false);
+
+ return ra->state != SD_RADV_STATE_IDLE;
+}
+
+static void radv_reset(sd_radv *ra) {
+ assert(ra);
+
+ (void) event_source_disable(ra->timeout_event_source);
+
+ ra->recv_event_source =
+ sd_event_source_unref(ra->recv_event_source);
+
+ ra->ra_sent = 0;
+}
+
+static sd_radv *radv_free(sd_radv *ra) {
+ if (!ra)
+ return NULL;
+
+ while (ra->prefixes) {
+ sd_radv_prefix *p = ra->prefixes;
+
+ LIST_REMOVE(prefix, ra->prefixes, p);
+ sd_radv_prefix_unref(p);
+ }
+
+ while (ra->route_prefixes) {
+ sd_radv_route_prefix *p = ra->route_prefixes;
+
+ LIST_REMOVE(prefix, ra->route_prefixes, p);
+ sd_radv_route_prefix_unref(p);
+ }
+
+ 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);
+}
+
+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_route_prefix *rt;
+ sd_radv_prefix *p;
+ struct sockaddr_in6 dst_addr = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT,
+ };
+ struct nd_router_advert adv = {};
+ struct {
+ struct nd_opt_hdr opthdr;
+ struct ether_addr slladdr;
+ } _packed_ opt_mac = {
+ .opthdr = {
+ .nd_opt_type = ND_OPT_SOURCE_LINKADDR,
+ .nd_opt_len = (sizeof(struct nd_opt_hdr) +
+ sizeof(struct ether_addr) - 1) /8 + 1,
+ },
+ };
+ struct nd_opt_mtu opt_mtu = {
+ .nd_opt_mtu_type = ND_OPT_MTU,
+ .nd_opt_mtu_len = 1,
+ };
+ /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, N routes, RDNSS
+ and DNSSL */
+ struct iovec iov[5 + ra->n_prefixes + ra->n_route_prefixes];
+ struct msghdr msg = {
+ .msg_name = &dst_addr,
+ .msg_namelen = sizeof(dst_addr),
+ .msg_iov = iov,
+ };
+ usec_t time_now;
+ int r;
+
+ assert(ra);
+
+ 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;
+ adv.nd_ra_curhoplimit = ra->hop_limit;
+ adv.nd_ra_flags_reserved = ra->flags;
+ adv.nd_ra_router_lifetime = htobe16(router_lifetime);
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&adv, sizeof(adv));
+
+ /* 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 (!ether_addr_is_null(&ra->mac_addr)) {
+ opt_mac.slladdr = ra->mac_addr;
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mac, sizeof(opt_mac));
+ }
+
+ if (ra->mtu) {
+ opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu);
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mtu, sizeof(opt_mtu));
+ }
+
+ 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++] = IOVEC_MAKE(&p->opt, sizeof(p->opt));
+ }
+
+ LIST_FOREACH(prefix, rt, ra->route_prefixes)
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&rt->opt, sizeof(rt->opt));
+
+ if (ra->rdnss)
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->rdnss, ra->rdnss->length * 8);
+
+ if (ra->dnssl)
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->dnssl, ra->dnssl->length * 8);
+
+ if (sendmsg(ra->fd, &msg, 0) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ sd_radv *ra = userdata;
+ _cleanup_free_ char *addr = NULL;
+ struct in6_addr src;
+ triple_timestamp timestamp;
+ int r;
+ ssize_t buflen;
+ _cleanup_free_ char *buf = NULL;
+
+ assert(s);
+ assert(ra);
+ assert(ra->event);
+
+ buflen = next_datagram_size_fd(fd);
+ if (buflen < 0)
+ return (int) buflen;
+
+ buf = new0(char, buflen);
+ if (!buf)
+ return -ENOMEM;
+
+ r = icmp6_receive(fd, buf, buflen, &src, &timestamp);
+ if (r < 0) {
+ switch (r) {
+ case -EADDRNOTAVAIL:
+ (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr);
+ log_radv("Received RS from non-link-local address %s. Ignoring", addr);
+ break;
+
+ case -EMULTIHOP:
+ log_radv("Received RS with invalid hop limit. Ignoring.");
+ break;
+
+ case -EPFNOSUPPORT:
+ log_radv("Received invalid source address from ICMPv6 socket. Ignoring.");
+ break;
+
+ case -EAGAIN: /* ignore spurious wakeups */
+ break;
+
+ default:
+ log_radv_errno(r, "Unexpected error receiving from ICMPv6 socket: %m");
+ break;
+ }
+
+ return 0;
+ }
+
+ if ((size_t) buflen < sizeof(struct nd_router_solicit)) {
+ log_radv("Too short packet received");
+ return 0;
+ }
+
+ (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr);
+
+ r = radv_send(ra, &src, ra->lifetime);
+ if (r < 0)
+ log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", strnull(addr));
+ else
+ log_radv("Sent solicited Router Advertisement to %s", strnull(addr));
+
+ return 0;
+}
+
+static usec_t radv_compute_timeout(usec_t min, usec_t max) {
+ assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC);
+
+ /* RFC 4861: min must be no less than 3s, max must be no less than 4s */
+ min = MAX(min, 3*USEC_PER_SEC);
+ max = MAX(max, 4*USEC_PER_SEC);
+
+ return min + (random_u32() % (max - min));
+}
+
+static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
+ int r;
+ sd_radv *ra = userdata;
+ usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC;
+ usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC;
+ usec_t time_now, timeout;
+ char time_string[FORMAT_TIMESPAN_MAX];
+
+ assert(s);
+ assert(ra);
+ assert(ra->event);
+
+ 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_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) {
+ max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC;
+ min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3;
+ }
+
+ /* RFC 4861, Section 6.2.1, lifetime must be at least MaxRtrAdvInterval,
+ so lower the interval here */
+ if (ra->lifetime > 0 && (ra->lifetime * USEC_PER_SEC) < max_timeout) {
+ max_timeout = ra->lifetime * USEC_PER_SEC;
+ min_timeout = max_timeout / 3;
+ }
+
+ timeout = radv_compute_timeout(min_timeout, max_timeout);
+
+ log_radv("Next Router Advertisement in %s",
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX,
+ timeout, USEC_PER_SEC));
+
+ 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:
+ sd_radv_stop(ra);
+
+ return 0;
+}
+
+_public_ int sd_radv_stop(sd_radv *ra) {
+ int r;
+
+ if (!ra)
+ return 0;
+
+ 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_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m");
+
+ radv_reset(ra);
+ ra->fd = safe_close(ra->fd);
+ ra->state = SD_RADV_STATE_IDLE;
+
+ return 0;
+}
+
+_public_ int sd_radv_start(sd_radv *ra) {
+ int r;
+
+ assert_return(ra, -EINVAL);
+ assert_return(ra->event, -EINVAL);
+ assert_return(ra->ifindex > 0, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return 0;
+
+ 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;
+
+ r = icmp6_bind_router_advertisement(ra->ifindex);
+ if (r < 0)
+ goto fail;
+
+ ra->fd = r;
+
+ r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority);
+ if (r < 0)
+ goto fail;
+
+ (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message");
+
+ ra->state = SD_RADV_STATE_ADVERTISING;
+
+ log_radv("Started IPv6 Router Advertisement daemon");
+
+ return 0;
+
+ fail:
+ radv_reset(ra);
+
+ return r;
+}
+
+_public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) {
+ assert_return(ra, -EINVAL);
+ assert_return(ifindex > 0, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return -EBUSY;
+
+ ra->ifindex = ifindex;
+
+ return 0;
+}
+
+_public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return -EBUSY;
+
+ if (mac_addr)
+ ra->mac_addr = *mac_addr;
+ else
+ zero(ra->mac_addr);
+
+ return 0;
+}
+
+_public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) {
+ assert_return(ra, -EINVAL);
+ assert_return(mtu >= 1280, -EINVAL);
+
+ ra->mtu = mtu;
+
+ return 0;
+}
+
+_public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return -EBUSY;
+
+ ra->hop_limit = hop_limit;
+
+ return 0;
+}
+
+_public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint16_t router_lifetime) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return -EBUSY;
+
+ /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set
+ * to (00) by the sender..." */
+ if (router_lifetime == 0 &&
+ (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3))
+ return -ETIME;
+
+ ra->lifetime = router_lifetime;
+
+ return 0;
+}
+
+_public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return -EBUSY;
+
+ SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed);
+
+ return 0;
+}
+
+_public_ int sd_radv_set_other_information(sd_radv *ra, int other) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != SD_RADV_STATE_IDLE)
+ return -EBUSY;
+
+ SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other);
+
+ return 0;
+}
+
+_public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) {
+ assert_return(ra, -EINVAL);
+ assert_return(IN_SET(preference,
+ SD_NDISC_PREFERENCE_LOW,
+ SD_NDISC_PREFERENCE_MEDIUM,
+ SD_NDISC_PREFERENCE_HIGH), -EINVAL);
+
+ /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set
+ * to (00) by the sender..." */
+ if (ra->lifetime == 0 && preference != SD_NDISC_PREFERENCE_MEDIUM)
+ return -EINVAL;
+
+ ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3);
+
+ return 0;
+}
+
+_public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int 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);
+
+ if (!p)
+ return -EINVAL;
+
+ /* Refuse prefixes that don't have a prefix set */
+ if (IN6_IS_ADDR_UNSPECIFIED(&p->opt.in6_addr))
+ return -ENOEXEC;
+
+ LIST_FOREACH(prefix, cur, ra->prefixes) {
+
+ r = in_addr_prefix_intersect(AF_INET6,
+ (union in_addr_union*) &cur->opt.in6_addr,
+ 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*) &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);
+
+ 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);
+
+ if (!dynamic) {
+ log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen);
+ return 0;
+ }
+
+ cur = p;
+
+ /* If RAs have already been sent, send an RA immediately to announce the newly-added prefix */
+ if (ra->ra_sent > 0) {
+ r = radv_send(ra, NULL, ra->lifetime);
+ if (r < 0)
+ log_radv_errno(r, "Unable to send Router Advertisement for added prefix: %m");
+ else
+ log_radv("Sent Router Advertisement for added prefix");
+ }
+
+ 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("Updated prefix %s/%u preferred %s valid %s",
+ 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--;
+ sd_radv_prefix_unref(cur);
+
+ break;
+ }
+
+ return cur;
+}
+
+_public_ int sd_radv_add_route_prefix(sd_radv *ra, sd_radv_route_prefix *p, int dynamic) {
+ char time_string_valid[FORMAT_TIMESPAN_MAX];
+ usec_t time_now, valid, valid_until;
+ _cleanup_free_ char *pretty = NULL;
+ sd_radv_route_prefix *cur;
+ int r;
+
+ assert_return(ra, -EINVAL);
+
+ if (!p)
+ return -EINVAL;
+
+ (void) in_addr_to_string(AF_INET6,
+ (union in_addr_union*) &p->opt.in6_addr,
+ &pretty);
+
+ LIST_FOREACH(prefix, cur, ra->route_prefixes) {
+ _cleanup_free_ char *addr = NULL;
+
+ r = in_addr_prefix_intersect(AF_INET6,
+ (union in_addr_union*) &cur->opt.in6_addr,
+ cur->opt.prefixlen,
+ (union in_addr_union*) &p->opt.in6_addr,
+ p->opt.prefixlen);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ 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);
+ log_radv("IPv6 route prefix %s/%u already configured, ignoring %s/%u",
+ strempty(addr), cur->opt.prefixlen,
+ strempty(pretty), p->opt.prefixlen);
+
+ return -EEXIST;
+ }
+
+ p = sd_radv_route_prefix_ref(p);
+
+ LIST_APPEND(prefix, ra->route_prefixes, p);
+ ra->n_route_prefixes++;
+
+ if (!dynamic) {
+ log_radv("Added prefix %s/%u", strempty(pretty), p->opt.prefixlen);
+ return 0;
+ }
+
+ /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */
+ if (ra->ra_sent > 0) {
+ r = radv_send(ra, NULL, ra->lifetime);
+ if (r < 0)
+ log_radv_errno(r, "Unable to send Router Advertisement for added route prefix: %m");
+ else
+ log_radv("Sent Router Advertisement for added route prefix");
+ }
+
+ update:
+ r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ return r;
+
+ valid = be32toh(p->opt.lifetime) * USEC_PER_SEC;
+ valid_until = usec_add(valid, time_now);
+ if (valid_until == USEC_INFINITY)
+ return -EOVERFLOW;
+
+ log_radv("Updated route prefix %s/%u valid %s",
+ strempty(pretty), p->opt.prefixlen,
+ format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, valid, USEC_PER_SEC));
+
+ 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_and_replace(ra->rdnss, opt_rdnss);
+
+ ra->n_rdnss = n_dns;
+
+ return 0;
+}
+
+_public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime,
+ char **search_list) {
+ _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL;
+ size_t len = 0;
+ char **s;
+ uint8_t *p;
+
+ assert_return(ra, -EINVAL);
+
+ if (strv_isempty(search_list)) {
+ ra->dnssl = mfree(ra->dnssl);
+ return 0;
+ }
+
+ STRV_FOREACH(s, search_list)
+ len += strlen(*s) + 2;
+
+ len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7;
+
+ opt_dnssl = malloc0(len);
+ if (!opt_dnssl)
+ return -ENOMEM;
+
+ opt_dnssl->type = SD_RADV_OPT_DNSSL;
+ opt_dnssl->length = len / 8;
+ opt_dnssl->lifetime = htobe32(lifetime);
+
+ p = (uint8_t *)(opt_dnssl + 1);
+ len -= sizeof(struct sd_radv_opt_dns);
+
+ STRV_FOREACH(s, search_list) {
+ int r;
+
+ r = dns_name_to_wire_format(*s, p, len, false);
+ if (r < 0)
+ return r;
+
+ if (len < (size_t)r)
+ return -ENOBUFS;
+
+ p += r;
+ len -= r;
+ }
+
+ free_and_replace(ra->dnssl, opt_dnssl);
+
+ return 0;
+}
+
+_public_ int sd_radv_prefix_new(sd_radv_prefix **ret) {
+ sd_radv_prefix *p;
+
+ assert_return(ret, -EINVAL);
+
+ p = new(sd_radv_prefix, 1);
+ if (!p)
+ return -ENOMEM;
+
+ *p = (sd_radv_prefix) {
+ .n_ref = 1,
+
+ .opt.type = ND_OPT_PREFIX_INFORMATION,
+ .opt.length = (sizeof(p->opt) - 1)/8 + 1,
+ .opt.prefixlen = 64,
+
+ /* RFC 4861, Section 6.2.1 */
+ .opt.flags = ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO,
+
+ .opt.preferred_lifetime = htobe32(604800),
+ .opt.valid_lifetime = htobe32(2592000),
+ };
+
+ *ret = p;
+ return 0;
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree);
+
+_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);
+
+ 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_get_prefix(sd_radv_prefix *p, struct in6_addr *ret_in6_addr,
+ unsigned char *ret_prefixlen) {
+ assert_return(p, -EINVAL);
+ assert_return(ret_in6_addr, -EINVAL);
+ assert_return(ret_prefixlen, -EINVAL);
+
+ *ret_in6_addr = p->opt.in6_addr;
+ *ret_prefixlen = p->opt.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;
+}
+
+_public_ int sd_radv_route_prefix_new(sd_radv_route_prefix **ret) {
+ sd_radv_route_prefix *p;
+
+ assert_return(ret, -EINVAL);
+
+ p = new(sd_radv_route_prefix, 1);
+ if (!p)
+ return -ENOMEM;
+
+ *p = (sd_radv_route_prefix) {
+ .n_ref = 1,
+
+ .opt.type = SD_RADV_OPT_ROUTE_INFORMATION,
+ .opt.length = DIV_ROUND_UP(sizeof(p->opt), 8),
+ .opt.prefixlen = 64,
+
+ .opt.lifetime = htobe32(604800),
+ };
+
+ *ret = p;
+ return 0;
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix, sd_radv_route_prefix, mfree);
+
+_public_ int sd_radv_prefix_set_route_prefix(sd_radv_route_prefix *p, const struct in6_addr *in6_addr,
+ unsigned char prefixlen) {
+ assert_return(p, -EINVAL);
+ assert_return(in6_addr, -EINVAL);
+
+ if (prefixlen > 128)
+ return -EINVAL;
+
+ if (prefixlen > 64)
+ /* unusual but allowed, log it */
+ log_radv("Unusual prefix length %u greater than 64", prefixlen);
+
+ p->opt.in6_addr = *in6_addr;
+ p->opt.prefixlen = prefixlen;
+
+ return 0;
+}
+
+_public_ int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix *p, uint32_t valid_lifetime) {
+ assert_return(p, -EINVAL);
+
+ p->opt.lifetime = htobe32(valid_lifetime);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 03:34:52 +0000