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-rw-r--r--src/libsystemd-network/sd-radv.c1161
1 files changed, 1161 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..97d306c
--- /dev/null
+++ b/src/libsystemd-network/sd-radv.c
@@ -0,0 +1,1161 @@
+/* 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 "iovec-util.h"
+#include "macro.h"
+#include "memory-util.h"
+#include "network-common.h"
+#include "radv-internal.h"
+#include "random-util.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unaligned.h"
+
+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 = -EBADF,
+ .lifetime_usec = RADV_DEFAULT_ROUTER_LIFETIME_USEC,
+ };
+
+ *ret = TAKE_PTR(ra);
+
+ return 0;
+}
+
+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;
+}
+
+int sd_radv_detach_event(sd_radv *ra) {
+
+ assert_return(ra, -EINVAL);
+
+ ra->event = sd_event_unref(ra->event);
+ return 0;
+}
+
+sd_event *sd_radv_get_event(sd_radv *ra) {
+ assert_return(ra, NULL);
+
+ return ra->event;
+}
+
+int sd_radv_is_running(sd_radv *ra) {
+ assert_return(ra, false);
+
+ return ra->state != 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_disable_unref(ra->recv_event_source);
+
+ ra->ra_sent = 0;
+}
+
+static sd_radv *radv_free(sd_radv *ra) {
+ if (!ra)
+ return NULL;
+
+ LIST_CLEAR(prefix, ra->prefixes, sd_radv_prefix_unref);
+ LIST_CLEAR(prefix, ra->route_prefixes, sd_radv_route_prefix_unref);
+ LIST_CLEAR(prefix, ra->pref64_prefixes, sd_radv_pref64_prefix_unref);
+
+ free(ra->rdnss);
+ free(ra->dnssl);
+
+ radv_reset(ra);
+
+ sd_event_source_unref(ra->timeout_event_source);
+ sd_radv_detach_event(ra);
+
+ ra->fd = safe_close(ra->fd);
+ free(ra->ifname);
+
+ return mfree(ra);
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free);
+
+static bool router_lifetime_is_valid(usec_t lifetime_usec) {
+ return lifetime_usec == 0 ||
+ (lifetime_usec >= RADV_MIN_ROUTER_LIFETIME_USEC &&
+ lifetime_usec <= RADV_MAX_ROUTER_LIFETIME_USEC);
+}
+
+static int radv_send(sd_radv *ra, const struct in6_addr *dst, usec_t lifetime_usec) {
+ 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, N pref64 prefixes, RDNSS,
+ * DNSSL, and home agent. */
+ struct iovec iov[6 + ra->n_prefixes + ra->n_route_prefixes + ra->n_pref64_prefixes];
+ struct msghdr msg = {
+ .msg_name = &dst_addr,
+ .msg_namelen = sizeof(dst_addr),
+ .msg_iov = iov,
+ };
+ usec_t time_now;
+ int r;
+
+ assert(ra);
+ assert(router_lifetime_is_valid(lifetime_usec));
+
+ r = sd_event_now(ra->event, CLOCK_BOOTTIME, &time_now);
+ if (r < 0)
+ return r;
+
+ if (dst && in6_addr_is_set(dst))
+ dst_addr.sin6_addr = *dst;
+
+ adv.nd_ra_type = ND_ROUTER_ADVERT;
+ adv.nd_ra_curhoplimit = ra->hop_limit;
+ adv.nd_ra_retransmit = usec_to_be32_msec(ra->retransmit_usec);
+ adv.nd_ra_flags_reserved = ra->flags;
+ assert_cc(RADV_MAX_ROUTER_LIFETIME_USEC <= UINT16_MAX * USEC_PER_SEC);
+ adv.nd_ra_router_lifetime = usec_to_be16_sec(lifetime_usec);
+ 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 > 0) {
+ 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) {
+ usec_t lifetime_valid_usec, lifetime_preferred_usec;
+
+ lifetime_valid_usec = MIN(usec_sub_unsigned(p->valid_until, time_now),
+ p->lifetime_valid_usec);
+
+ lifetime_preferred_usec = MIN3(usec_sub_unsigned(p->preferred_until, time_now),
+ p->lifetime_preferred_usec,
+ lifetime_valid_usec);
+
+ p->opt.lifetime_valid = usec_to_be32_sec(lifetime_valid_usec);
+ p->opt.lifetime_preferred = usec_to_be32_sec(lifetime_preferred_usec);
+
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&p->opt, sizeof(p->opt));
+ }
+
+ LIST_FOREACH(prefix, rt, ra->route_prefixes) {
+ rt->opt.lifetime = usec_to_be32_sec(MIN(usec_sub_unsigned(rt->valid_until, time_now),
+ rt->lifetime_usec));
+
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&rt->opt, sizeof(rt->opt));
+ }
+
+ LIST_FOREACH(prefix, p, ra->pref64_prefixes)
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&p->opt, sizeof(p->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 (FLAGS_SET(ra->flags, ND_RA_FLAG_HOME_AGENT)) {
+ ra->home_agent.nd_opt_home_agent_info_type = ND_OPT_HOME_AGENT_INFO;
+ ra->home_agent.nd_opt_home_agent_info_len = 1;
+
+ /* 0 means to place the current Router Lifetime value */
+ if (ra->home_agent.nd_opt_home_agent_info_lifetime == 0)
+ ra->home_agent.nd_opt_home_agent_info_lifetime = adv.nd_ra_router_lifetime;
+
+ iov[msg.msg_iovlen++] = IOVEC_MAKE(&ra->home_agent, sizeof(ra->home_agent));
+ }
+
+ 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 = ASSERT_PTR(userdata);
+ struct in6_addr src;
+ triple_timestamp timestamp;
+ int r;
+
+ assert(s);
+ assert(ra->event);
+
+ ssize_t buflen = next_datagram_size_fd(fd);
+ if (ERRNO_IS_NEG_TRANSIENT(buflen) || ERRNO_IS_NEG_DISCONNECT(buflen))
+ return 0;
+ if (buflen < 0) {
+ log_radv_errno(ra, buflen, "Failed to determine datagram size to read, ignoring: %m");
+ return 0;
+ }
+
+ _cleanup_free_ char *buf = new0(char, buflen);
+ if (!buf)
+ return -ENOMEM;
+
+ r = icmp6_receive(fd, buf, buflen, &src, &timestamp);
+ if (ERRNO_IS_NEG_TRANSIENT(r) || ERRNO_IS_NEG_DISCONNECT(r))
+ return 0;
+ if (r < 0)
+ switch (r) {
+ case -EADDRNOTAVAIL:
+ log_radv(ra, "Received RS from neither link-local nor null address. Ignoring");
+ return 0;
+
+ case -EMULTIHOP:
+ log_radv(ra, "Received RS with invalid hop limit. Ignoring.");
+ return 0;
+
+ case -EPFNOSUPPORT:
+ log_radv(ra, "Received invalid source address from ICMPv6 socket. Ignoring.");
+ return 0;
+
+ default:
+ log_radv_errno(ra, r, "Unexpected error receiving from ICMPv6 socket, ignoring: %m");
+ return 0;
+ }
+
+ if ((size_t) buflen < sizeof(struct nd_router_solicit)) {
+ log_radv(ra, "Too short packet received, ignoring");
+ return 0;
+ }
+
+ /* TODO: if the sender address is null, check that the message does not have the source link-layer
+ * address option. See RFC 4861 Section 6.1.1. */
+
+ const char *addr = IN6_ADDR_TO_STRING(&src);
+
+ r = radv_send(ra, &src, ra->lifetime_usec);
+ if (r < 0)
+ log_radv_errno(ra, r, "Unable to send solicited Router Advertisement to %s, ignoring: %m", addr);
+ else
+ log_radv(ra, "Sent solicited Router Advertisement to %s", addr);
+
+ return 0;
+}
+
+static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
+ usec_t min_timeout, max_timeout, time_now, timeout;
+ sd_radv *ra = ASSERT_PTR(userdata);
+ int r;
+
+ assert(s);
+ assert(ra->event);
+ assert(router_lifetime_is_valid(ra->lifetime_usec));
+
+ r = sd_event_now(ra->event, CLOCK_BOOTTIME, &time_now);
+ if (r < 0)
+ goto fail;
+
+ r = radv_send(ra, NULL, ra->lifetime_usec);
+ if (r < 0)
+ log_radv_errno(ra, r, "Unable to send Router Advertisement, ignoring: %m");
+
+ /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */
+ if (ra->ra_sent < RADV_MAX_INITIAL_RTR_ADVERTISEMENTS)
+ max_timeout = RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC;
+ else
+ max_timeout = RADV_DEFAULT_MAX_TIMEOUT_USEC;
+
+ /* RFC 4861, Section 6.2.1, lifetime must be at least MaxRtrAdvInterval,
+ * so lower the interval here */
+ if (ra->lifetime_usec > 0)
+ max_timeout = MIN(max_timeout, ra->lifetime_usec);
+
+ if (max_timeout >= 9 * USEC_PER_SEC)
+ min_timeout = max_timeout / 3;
+ else
+ min_timeout = max_timeout * 3 / 4;
+
+ /* RFC 4861, Section 6.2.1.
+ * MaxRtrAdvInterval MUST be no less than 4 seconds and no greater than 1800 seconds.
+ * MinRtrAdvInterval MUST be no less than 3 seconds and no greater than .75 * MaxRtrAdvInterval. */
+ assert(max_timeout >= RADV_MIN_MAX_TIMEOUT_USEC);
+ assert(max_timeout <= RADV_MAX_MAX_TIMEOUT_USEC);
+ assert(min_timeout >= RADV_MIN_MIN_TIMEOUT_USEC);
+ assert(min_timeout <= max_timeout * 3 / 4);
+
+ timeout = min_timeout + random_u64_range(max_timeout - min_timeout);
+ log_radv(ra, "Next Router Advertisement in %s", FORMAT_TIMESPAN(timeout, USEC_PER_SEC));
+
+ r = event_reset_time(ra->event, &ra->timeout_event_source,
+ CLOCK_BOOTTIME,
+ usec_add(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;
+}
+
+int sd_radv_stop(sd_radv *ra) {
+ int r;
+
+ if (!ra)
+ return 0;
+
+ if (ra->state == RADV_STATE_IDLE)
+ return 0;
+
+ log_radv(ra, "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(ra, r, "Unable to send last Router Advertisement with router lifetime set to zero, ignoring: %m");
+
+ radv_reset(ra);
+ ra->fd = safe_close(ra->fd);
+ ra->state = RADV_STATE_IDLE;
+
+ return 0;
+}
+
+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 != RADV_STATE_IDLE)
+ return 0;
+
+ r = event_reset_time(ra->event, &ra->timeout_event_source,
+ CLOCK_BOOTTIME,
+ 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 = RADV_STATE_ADVERTISING;
+
+ log_radv(ra, "Started IPv6 Router Advertisement daemon");
+
+ return 0;
+
+ fail:
+ radv_reset(ra);
+
+ return r;
+}
+
+int sd_radv_set_ifindex(sd_radv *ra, int ifindex) {
+ assert_return(ra, -EINVAL);
+ assert_return(ifindex > 0, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ ra->ifindex = ifindex;
+
+ return 0;
+}
+
+int sd_radv_set_ifname(sd_radv *ra, const char *ifname) {
+ assert_return(ra, -EINVAL);
+ assert_return(ifname, -EINVAL);
+
+ if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE))
+ return -EINVAL;
+
+ return free_and_strdup(&ra->ifname, ifname);
+}
+
+int sd_radv_get_ifname(sd_radv *ra, const char **ret) {
+ int r;
+
+ assert_return(ra, -EINVAL);
+
+ r = get_ifname(ra->ifindex, &ra->ifname);
+ if (r < 0)
+ return r;
+
+ if (ret)
+ *ret = ra->ifname;
+
+ return 0;
+}
+
+int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ if (mac_addr)
+ ra->mac_addr = *mac_addr;
+ else
+ zero(ra->mac_addr);
+
+ return 0;
+}
+
+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;
+}
+
+int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ ra->hop_limit = hop_limit;
+
+ return 0;
+}
+
+int sd_radv_set_retransmit(sd_radv *ra, uint64_t usec) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ if (usec > RADV_MAX_RETRANSMIT_USEC)
+ return -EINVAL;
+
+ ra->retransmit_usec = usec;
+ return 0;
+}
+
+int sd_radv_set_router_lifetime(sd_radv *ra, uint64_t usec) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ if (!router_lifetime_is_valid(usec))
+ return -EINVAL;
+
+ /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set
+ * to (00) by the sender..." */
+ if (usec == 0 &&
+ (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3))
+ return -EINVAL;
+
+ ra->lifetime_usec = usec;
+ return 0;
+}
+
+int sd_radv_set_managed_information(sd_radv *ra, int managed) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed);
+
+ return 0;
+}
+
+int sd_radv_set_other_information(sd_radv *ra, int other) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other);
+
+ return 0;
+}
+
+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_usec == 0 && preference != SD_NDISC_PREFERENCE_MEDIUM)
+ return -EINVAL;
+
+ ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3);
+
+ return 0;
+}
+
+int sd_radv_set_home_agent_information(sd_radv *ra, int home_agent) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ SET_FLAG(ra->flags, ND_RA_FLAG_HOME_AGENT, home_agent);
+
+ return 0;
+}
+
+int sd_radv_set_home_agent_preference(sd_radv *ra, uint16_t preference) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ ra->home_agent.nd_opt_home_agent_info_preference = htobe16(preference);
+
+ return 0;
+}
+
+int sd_radv_set_home_agent_lifetime(sd_radv *ra, uint64_t lifetime_usec) {
+ assert_return(ra, -EINVAL);
+
+ if (ra->state != RADV_STATE_IDLE)
+ return -EBUSY;
+
+ if (lifetime_usec > RADV_HOME_AGENT_MAX_LIFETIME_USEC)
+ return -EINVAL;
+
+ ra->home_agent.nd_opt_home_agent_info_lifetime = usec_to_be16_sec(lifetime_usec);
+ return 0;
+}
+
+int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p) {
+ sd_radv_prefix *found = NULL;
+ int r;
+
+ assert_return(ra, -EINVAL);
+ assert_return(p, -EINVAL);
+
+ /* Refuse prefixes that don't have a prefix set */
+ if (in6_addr_is_null(&p->opt.in6_addr))
+ return -ENOEXEC;
+
+ const char *addr_p = IN6_ADDR_PREFIX_TO_STRING(&p->opt.in6_addr, p->opt.prefixlen);
+
+ LIST_FOREACH(prefix, cur, ra->prefixes) {
+ r = in_addr_prefix_intersect(AF_INET6,
+ (const union in_addr_union*) &cur->opt.in6_addr,
+ cur->opt.prefixlen,
+ (const union in_addr_union*) &p->opt.in6_addr,
+ p->opt.prefixlen);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (cur->opt.prefixlen == p->opt.prefixlen) {
+ found = cur;
+ break;
+ }
+
+ return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST),
+ "IPv6 prefix %s conflicts with %s, ignoring.",
+ addr_p,
+ IN6_ADDR_PREFIX_TO_STRING(&cur->opt.in6_addr, cur->opt.prefixlen));
+ }
+
+ if (found) {
+ /* p and cur may be equivalent. First increment the reference counter. */
+ sd_radv_prefix_ref(p);
+
+ /* Then, remove the old entry. */
+ LIST_REMOVE(prefix, ra->prefixes, found);
+ sd_radv_prefix_unref(found);
+
+ /* Finally, add the new entry. */
+ LIST_APPEND(prefix, ra->prefixes, p);
+
+ log_radv(ra, "Updated/replaced IPv6 prefix %s (preferred: %s, valid: %s)",
+ addr_p,
+ FORMAT_TIMESPAN(p->lifetime_preferred_usec, USEC_PER_SEC),
+ FORMAT_TIMESPAN(p->lifetime_valid_usec, USEC_PER_SEC));
+ } else {
+ /* The prefix is new. Let's simply add it. */
+
+ sd_radv_prefix_ref(p);
+ LIST_APPEND(prefix, ra->prefixes, p);
+ ra->n_prefixes++;
+
+ log_radv(ra, "Added prefix %s", addr_p);
+ }
+
+ if (ra->state == RADV_STATE_IDLE)
+ return 0;
+
+ if (ra->ra_sent == 0)
+ return 0;
+
+ /* If RAs have already been sent, send an RA immediately to announce the newly-added prefix */
+ r = radv_send(ra, NULL, ra->lifetime_usec);
+ if (r < 0)
+ log_radv_errno(ra, r, "Unable to send Router Advertisement for added prefix %s, ignoring: %m", addr_p);
+ else
+ log_radv(ra, "Sent Router Advertisement for added/updated prefix %s.", addr_p);
+
+ return 0;
+}
+
+void sd_radv_remove_prefix(
+ sd_radv *ra,
+ const struct in6_addr *prefix,
+ unsigned char prefixlen) {
+
+ if (!ra)
+ return;
+
+ if (!prefix)
+ return;
+
+ LIST_FOREACH(prefix, cur, ra->prefixes) {
+ if (prefixlen != cur->opt.prefixlen)
+ continue;
+
+ if (!in6_addr_equal(prefix, &cur->opt.in6_addr))
+ continue;
+
+ LIST_REMOVE(prefix, ra->prefixes, cur);
+ ra->n_prefixes--;
+ sd_radv_prefix_unref(cur);
+ return;
+ }
+}
+
+int sd_radv_add_route_prefix(sd_radv *ra, sd_radv_route_prefix *p) {
+ sd_radv_route_prefix *found = NULL;
+ int r;
+
+ assert_return(ra, -EINVAL);
+ assert_return(p, -EINVAL);
+
+ const char *addr_p = IN6_ADDR_PREFIX_TO_STRING(&p->opt.in6_addr, p->opt.prefixlen);
+
+ LIST_FOREACH(prefix, cur, ra->route_prefixes) {
+ r = in_addr_prefix_intersect(AF_INET6,
+ (const union in_addr_union*) &cur->opt.in6_addr,
+ cur->opt.prefixlen,
+ (const union in_addr_union*) &p->opt.in6_addr,
+ p->opt.prefixlen);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (cur->opt.prefixlen == p->opt.prefixlen) {
+ found = cur;
+ break;
+ }
+
+ return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST),
+ "IPv6 route prefix %s conflicts with %s, ignoring.",
+ addr_p,
+ IN6_ADDR_PREFIX_TO_STRING(&cur->opt.in6_addr, cur->opt.prefixlen));
+ }
+
+ if (found) {
+ /* p and cur may be equivalent. First increment the reference counter. */
+ sd_radv_route_prefix_ref(p);
+
+ /* Then, remove the old entry. */
+ LIST_REMOVE(prefix, ra->route_prefixes, found);
+ sd_radv_route_prefix_unref(found);
+
+ /* Finally, add the new entry. */
+ LIST_APPEND(prefix, ra->route_prefixes, p);
+
+ log_radv(ra, "Updated/replaced IPv6 route prefix %s (lifetime: %s)",
+ strna(addr_p),
+ FORMAT_TIMESPAN(p->lifetime_usec, USEC_PER_SEC));
+ } else {
+ /* The route prefix is new. Let's simply add it. */
+
+ sd_radv_route_prefix_ref(p);
+ LIST_APPEND(prefix, ra->route_prefixes, p);
+ ra->n_route_prefixes++;
+
+ log_radv(ra, "Added route prefix %s", strna(addr_p));
+ }
+
+ if (ra->state == RADV_STATE_IDLE)
+ return 0;
+
+ if (ra->ra_sent == 0)
+ return 0;
+
+ /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */
+ r = radv_send(ra, NULL, ra->lifetime_usec);
+ if (r < 0)
+ log_radv_errno(ra, r, "Unable to send Router Advertisement for added route prefix %s, ignoring: %m",
+ strna(addr_p));
+ else
+ log_radv(ra, "Sent Router Advertisement for added route prefix %s.", strna(addr_p));
+
+ return 0;
+}
+
+int sd_radv_add_pref64_prefix(sd_radv *ra, sd_radv_pref64_prefix *p) {
+ sd_radv_pref64_prefix *found = NULL;
+ int r;
+
+ assert_return(ra, -EINVAL);
+ assert_return(p, -EINVAL);
+
+ const char *addr_p = IN6_ADDR_PREFIX_TO_STRING(&p->in6_addr, p->prefixlen);
+
+ LIST_FOREACH(prefix, cur, ra->pref64_prefixes) {
+ r = in_addr_prefix_intersect(AF_INET6,
+ (const union in_addr_union*) &cur->in6_addr,
+ cur->prefixlen,
+ (const union in_addr_union*) &p->in6_addr,
+ p->prefixlen);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (cur->prefixlen == p->prefixlen) {
+ found = cur;
+ break;
+ }
+
+ return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST),
+ "IPv6 PREF64 prefix %s conflicts with %s, ignoring.",
+ addr_p,
+ IN6_ADDR_PREFIX_TO_STRING(&cur->in6_addr, cur->prefixlen));
+ }
+
+ if (found) {
+ /* p and cur may be equivalent. First increment the reference counter. */
+ sd_radv_pref64_prefix_ref(p);
+
+ /* Then, remove the old entry. */
+ LIST_REMOVE(prefix, ra->pref64_prefixes, found);
+ sd_radv_pref64_prefix_unref(found);
+
+ /* Finally, add the new entry. */
+ LIST_APPEND(prefix, ra->pref64_prefixes, p);
+
+ log_radv(ra, "Updated/replaced IPv6 PREF64 prefix %s (lifetime: %s)",
+ strna(addr_p),
+ FORMAT_TIMESPAN(p->lifetime_usec, USEC_PER_SEC));
+ } else {
+ /* The route prefix is new. Let's simply add it. */
+
+ sd_radv_pref64_prefix_ref(p);
+ LIST_APPEND(prefix, ra->pref64_prefixes, p);
+ ra->n_pref64_prefixes++;
+
+ log_radv(ra, "Added PREF64 prefix %s", strna(addr_p));
+ }
+
+ if (ra->state == RADV_STATE_IDLE)
+ return 0;
+
+ if (ra->ra_sent == 0)
+ return 0;
+
+ /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */
+ r = radv_send(ra, NULL, ra->lifetime_usec);
+ if (r < 0)
+ log_radv_errno(ra, r, "Unable to send Router Advertisement for added PREF64 prefix %s, ignoring: %m",
+ strna(addr_p));
+ else
+ log_radv(ra, "Sent Router Advertisement for added PREF64 prefix %s.", strna(addr_p));
+
+ return 0;
+}
+
+int sd_radv_set_rdnss(
+ sd_radv *ra,
+ uint64_t lifetime_usec,
+ 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 (lifetime_usec > RADV_RDNSS_MAX_LIFETIME_USEC)
+ return -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 = RADV_OPT_RDNSS;
+ opt_rdnss->length = len / 8;
+ opt_rdnss->lifetime = usec_to_be32_sec(lifetime_usec);
+
+ 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;
+}
+
+int sd_radv_set_dnssl(
+ sd_radv *ra,
+ uint64_t lifetime_usec,
+ char **search_list) {
+
+ _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL;
+ size_t len = 0;
+ uint8_t *p;
+
+ assert_return(ra, -EINVAL);
+
+ if (lifetime_usec > RADV_DNSSL_MAX_LIFETIME_USEC)
+ return -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 = RADV_OPT_DNSSL;
+ opt_dnssl->length = len / 8;
+ opt_dnssl->lifetime = usec_to_be32_sec(lifetime_usec);
+
+ 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;
+}
+
+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,
+
+ .lifetime_valid_usec = RADV_DEFAULT_VALID_LIFETIME_USEC,
+ .lifetime_preferred_usec = RADV_DEFAULT_PREFERRED_LIFETIME_USEC,
+ .valid_until = USEC_INFINITY,
+ .preferred_until = USEC_INFINITY,
+ };
+
+ *ret = p;
+ return 0;
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree);
+
+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(NULL, "Unusual prefix length %d greater than 64", prefixlen);
+
+ p->opt.in6_addr = *in6_addr;
+ p->opt.prefixlen = prefixlen;
+
+ return 0;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, uint64_t lifetime_usec, uint64_t valid_until) {
+ assert_return(p, -EINVAL);
+
+ p->lifetime_valid_usec = lifetime_usec;
+ p->valid_until = valid_until;
+
+ return 0;
+}
+
+int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, uint64_t lifetime_usec, uint64_t valid_until) {
+ assert_return(p, -EINVAL);
+
+ p->lifetime_preferred_usec = lifetime_usec;
+ p->preferred_until = valid_until;
+
+ return 0;
+}
+
+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 = RADV_OPT_ROUTE_INFORMATION,
+ .opt.length = DIV_ROUND_UP(sizeof(p->opt), 8),
+ .opt.prefixlen = 64,
+
+ .lifetime_usec = RADV_DEFAULT_VALID_LIFETIME_USEC,
+ .valid_until = USEC_INFINITY,
+ };
+
+ *ret = p;
+ return 0;
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix, sd_radv_route_prefix, mfree);
+
+int sd_radv_route_prefix_set_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(NULL, "Unusual prefix length %u greater than 64", prefixlen);
+
+ p->opt.in6_addr = *in6_addr;
+ p->opt.prefixlen = prefixlen;
+
+ return 0;
+}
+
+int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix *p, uint64_t lifetime_usec, uint64_t valid_until) {
+ assert_return(p, -EINVAL);
+
+ p->lifetime_usec = lifetime_usec;
+ p->valid_until = valid_until;
+
+ return 0;
+}
+
+int sd_radv_pref64_prefix_new(sd_radv_pref64_prefix **ret) {
+ sd_radv_pref64_prefix *p;
+
+ assert_return(ret, -EINVAL);
+
+ p = new(sd_radv_pref64_prefix, 1);
+ if (!p)
+ return -ENOMEM;
+
+ *p = (sd_radv_pref64_prefix) {
+ .n_ref = 1,
+
+ .opt.type = RADV_OPT_PREF64,
+ .opt.length = 2,
+ };
+
+ *ret = p;
+ return 0;
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_pref64_prefix, sd_radv_pref64_prefix, mfree);
+
+int sd_radv_pref64_prefix_set_prefix(
+ sd_radv_pref64_prefix *p,
+ const struct in6_addr *prefix,
+ uint8_t prefixlen,
+ uint64_t lifetime_usec) {
+
+ uint16_t pref64_lifetime;
+ uint8_t prefixlen_code;
+ int r;
+
+ assert_return(p, -EINVAL);
+ assert_return(prefix, -EINVAL);
+
+ r = pref64_prefix_length_to_plc(prefixlen, &prefixlen_code);
+ if (r < 0)
+ return log_radv_errno(NULL, r,
+ "Unsupported PREF64 prefix length %u. Valid lengths are 32, 40, 48, 56, 64 and 96", prefixlen);
+
+ if (lifetime_usec > PREF64_MAX_LIFETIME_USEC)
+ return -EINVAL;
+
+ /* RFC 8781 - 4.1 rounding up lifetime to multiply of 8 */
+ pref64_lifetime = DIV_ROUND_UP(lifetime_usec, 8 * USEC_PER_SEC) << 3;
+ pref64_lifetime |= prefixlen_code;
+
+ unaligned_write_be16(&p->opt.lifetime_and_plc, pref64_lifetime);
+ memcpy(&p->opt.prefix, prefix, sizeof(p->opt.prefix));
+
+ p->in6_addr = *prefix;
+ p->prefixlen = prefixlen;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 11:36:57 +0000