setsockopt(rtnl_event.uloop.fd, SOL_NETLINK,
NETLINK_ADD_MEMBERSHIP, &group, sizeof(group));
- // Synthesize initial address events
- struct {
- struct nlmsghdr nh;
- struct ifaddrmsg ifa;
- } req2 = {
- {sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
- ++rtnl_seqid, 0},
- {.ifa_family = AF_INET6}
- };
- send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT);
odhcpd_register(&rtnl_event);
// Open ICMPv6 socket
}
+static void dump_neigh_table(bool proxy)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct ndmsg ndm;
+ } req = {
+ {sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP,
+ ++rtnl_seqid, 0},
+ {.ndm_family = AF_INET6, .ndm_flags = (proxy) ? NTF_PROXY : 0}
+ };
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ odhcpd_process(&rtnl_event);
+}
+
+
int setup_ndp_interface(struct interface *iface, bool enable)
{
char procbuf[64];
snprintf(procbuf, sizeof(procbuf), "/proc/sys/net/ipv6/conf/%s/proxy_ndp", iface->ifname);
int procfd = open(procbuf, O_WRONLY);
+ bool dump_neigh = false;
- if (iface->ndp_event.uloop.fd >= 0) {
+ if (iface->ndp_event.uloop.fd > 0) {
uloop_fd_delete(&iface->ndp_event.uloop);
close(iface->ndp_event.uloop.fd);
iface->ndp_event.uloop.fd = -1;
- write(procfd, "0\n", 2);
+ if (!enable || iface->ndp != RELAYD_RELAY)
+ if (write(procfd, "0\n", 2) < 0) {}
+
+ dump_neigh = true;
+ }
+
+ if (enable && (iface->ra == RELAYD_SERVER ||
+ iface->dhcpv6 == RELAYD_SERVER || iface->ndp == RELAYD_RELAY)) {
+ // Synthesize initial address events
+ struct {
+ struct nlmsghdr nh;
+ struct ifaddrmsg ifa;
+ } req2 = {
+ {sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
+ ++rtnl_seqid, 0},
+ {.ifa_family = AF_INET6, .ifa_index = iface->ifindex}
+ };
+ send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT);
}
if (enable && iface->ndp == RELAYD_RELAY) {
- write(procfd, "1\n", 2);
+ if (write(procfd, "1\n", 2) < 0) {}
+ close(procfd);
int sock = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_IPV6));
if (sock < 0) {
.sll_family = AF_PACKET,
.sll_ifindex = iface->ifindex,
.sll_protocol = htons(ETH_P_IPV6),
+ .sll_hatype = 0,
+ .sll_pkttype = 0,
+ .sll_halen = 0,
+ .sll_addr = {0},
};
bind(sock, (struct sockaddr*)&ll, sizeof(ll));
iface->ndp_event.handle_dgram = handle_solicit;
odhcpd_register(&iface->ndp_event);
- // Dump neighbor events
- struct {
- struct nlmsghdr nh;
- struct ndmsg ndm;
- } req = {
- {sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP,
- ++rtnl_seqid, 0},
- {.ndm_family = AF_INET6}
- };
- send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ // If we already were enabled dump is unnecessary, if not do dump
+ if (!dump_neigh)
+ dump_neigh_table(false);
+ else
+ dump_neigh = false;
+ } else {
+ close(procfd);
}
- close(procfd);
+
+ if (dump_neigh)
+ dump_neigh_table(true);
return 0;
}
static ssize_t ping6(struct in6_addr *addr,
const struct interface *iface)
{
- struct sockaddr_in6 dest = {AF_INET6, 0, 0, *addr, 0};
+ struct sockaddr_in6 dest = {AF_INET6, 0, 0, *addr, iface->ifindex};
struct icmp6_hdr echo = {.icmp6_type = ICMP6_ECHO_REQUEST};
struct iovec iov = {&echo, sizeof(echo)};
-
- // Linux seems to not honor IPV6_PKTINFO on raw-sockets, so work around
- setsockopt(ping_socket, SOL_SOCKET, SO_BINDTODEVICE,
- iface->ifname, sizeof(iface->ifname));
return odhcpd_send(ping_socket, &dest, &iov, 1, iface);
}
struct interface *c;
list_for_each_entry(c, &interfaces, head)
if (iface->ndp == RELAYD_RELAY && iface != c &&
- (!ns_is_dad || !c->external == false))
+ (ns_is_dad || !c->external))
ping6(&req->nd_ns_target, c);
}
if (add) {
req.nh.nlmsg_type = RTM_NEWROUTE;
req.nh.nlmsg_flags |= (NLM_F_CREATE | NLM_F_REPLACE);
- req.rtm.rtm_protocol = RTPROT_BOOT;
+ req.rtm.rtm_protocol = RTPROT_STATIC;
req.rtm.rtm_scope = (gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
req.rtm.rtm_type = RTN_UNICAST;
} else {
req.rtm.rtm_scope = RT_SCOPE_NOWHERE;
}
- size_t reqlen = (gw) ? sizeof(req) : offsetof(struct req, rta_gw);
- send(rtnl_event.uloop.fd, &req, reqlen, MSG_DONTWAIT);
+ req.nh.nlmsg_len = (gw) ? sizeof(req) : offsetof(struct req, rta_gw);
+ send(rtnl_event.uloop.fd, &req, req.nh.nlmsg_len, MSG_DONTWAIT);
}
// Use rtnetlink to modify kernel routes
-static void setup_route(struct in6_addr *addr, struct interface *iface,
- bool add)
+static void setup_route(struct in6_addr *addr, struct interface *iface, bool add)
{
char namebuf[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf));
- syslog(LOG_NOTICE, "%s about %s on %s", (add) ? "Learned" : "Forgot",
- namebuf, (iface) ? iface->ifname : "<pending>");
-
- if (!iface || !iface->learn_routes)
- return;
+ syslog(LOG_NOTICE, "%s about %s on %s",
+ (add) ? "Learned" : "Forgot", namebuf, iface->ifname);
- odhcpd_setup_route(addr, 128, iface, NULL, add);
+ if (iface->learn_routes)
+ odhcpd_setup_route(addr, 128, iface, NULL, add);
}
for (struct nlmsghdr *nh = data; NLMSG_OK(nh, len);
nh = NLMSG_NEXT(nh, len)) {
+ struct ndmsg *ndm = NLMSG_DATA(nh);
struct rtmsg *rtm = NLMSG_DATA(nh);
- if ((nh->nlmsg_type == RTM_NEWROUTE ||
- nh->nlmsg_type == RTM_DELROUTE) &&
- rtm->rtm_dst_len == 0)
- raise(SIGUSR1); // Inform about a change in default route
- struct ndmsg *ndm = NLMSG_DATA(nh);
- struct ifaddrmsg *ifa = NLMSG_DATA(nh);
- if (nh->nlmsg_type != RTM_NEWNEIGH
- && nh->nlmsg_type != RTM_DELNEIGH
- && nh->nlmsg_type != RTM_NEWADDR
- && nh->nlmsg_type != RTM_DELADDR)
- continue; // Unrelated message type
bool is_addr = (nh->nlmsg_type == RTM_NEWADDR
|| nh->nlmsg_type == RTM_DELADDR);
+ bool is_route = (nh->nlmsg_type == RTM_NEWROUTE
+ || nh->nlmsg_type == RTM_DELROUTE);
+ bool is_neigh = (nh->nlmsg_type == RTM_NEWNEIGH
+ || nh->nlmsg_type == RTM_DELNEIGH);
// Family and ifindex are on the same offset for NEIGH and ADDR
- if (NLMSG_PAYLOAD(nh, 0) < sizeof(*ndm)
+ if ((!is_addr && !is_route && !is_neigh)
+ || NLMSG_PAYLOAD(nh, 0) < sizeof(*ndm)
|| ndm->ndm_family != AF_INET6)
- continue; //
+ continue;
- // Lookup interface
- struct interface *iface;
- if (!(iface = odhcpd_get_interface_by_index(ndm->ndm_ifindex)))
+ // Inform about a change in default route
+ if (is_route && rtm->rtm_dst_len == 0)
+ raise(SIGUSR1);
+ else if (is_route && rtm->rtm_dst_len == 128)
continue;
// Data to retrieve
- size_t rta_offset = (is_addr) ? sizeof(*ifa) : sizeof(*ndm);
- uint16_t atype = (is_addr) ? IFA_ADDRESS : NDA_DST;
+ size_t rta_offset = (is_route) ? sizeof(*rtm) : (is_addr) ?
+ sizeof(struct ifaddrmsg) : sizeof(*ndm);
+ uint16_t atype = (is_route) ? RTA_DST : (is_addr) ? IFA_ADDRESS : NDA_DST;
ssize_t alen = NLMSG_PAYLOAD(nh, rta_offset);
struct in6_addr *addr = NULL;
+ int *ifindex = (!is_route) ? &ndm->ndm_ifindex : NULL;
+ int *metric = NULL;
for (struct rtattr *rta = (void*)(((uint8_t*)ndm) + rta_offset);
- RTA_OK(rta, alen); rta = RTA_NEXT(rta, alen))
+ RTA_OK(rta, alen); rta = RTA_NEXT(rta, alen)) {
if (rta->rta_type == atype &&
- RTA_PAYLOAD(rta) >= sizeof(*addr))
+ RTA_PAYLOAD(rta) >= sizeof(*addr)) {
addr = RTA_DATA(rta);
+ } else if (is_route && rta->rta_type == RTA_OIF &&
+ RTA_PAYLOAD(rta) == sizeof(int)) {
+ ifindex = (int*)RTA_DATA(rta);
+ } else if (is_route && rta->rta_type == RTA_GATEWAY) {
+ ifindex = NULL;
+ break;
+ } else if (is_route && rta->rta_type == RTA_PRIORITY) {
+ metric = (int*)RTA_DATA(rta);
+ }
+ }
+
+ // Lookup interface
+ struct interface *iface = ifindex ? odhcpd_get_interface_by_index(*ifindex) : NULL;
+ if (!iface)
+ continue;
+
+ // Keep-alive neighbor entries for RA sending
+ if (nh->nlmsg_type == RTM_DELNEIGH && !(ndm->ndm_state & NUD_FAILED) &&
+ addr && IN6_IS_ADDR_LINKLOCAL(addr) && iface->ra == RELAYD_SERVER)
+ ping6(addr, iface);
// Address not specified or unrelated
if (!addr || IN6_IS_ADDR_LINKLOCAL(addr) ||
(NUD_REACHABLE | NUD_STALE | NUD_DELAY | NUD_PROBE
| NUD_PERMANENT | NUD_NOARP)));
- if (iface->ndp == RELAYD_RELAY) {
+ if (iface->ndp == RELAYD_RELAY && !is_route) {
// Replay change to all neighbor cache
struct {
struct nlmsghdr nh;
*addr
};
- if (add) {
- req.nh.nlmsg_type = RTM_NEWNEIGH;
- req.nh.nlmsg_flags |= NLM_F_CREATE;
-
+ if (ndm->ndm_flags & NTF_PROXY) {
+ // Dump & flush proxy entries
+ if (nh->nlmsg_type == RTM_NEWNEIGH) {
+ req.ndm.ndm_ifindex = iface->ifindex;
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ setup_route(addr, iface, false);
+ dump_neigh = true;
+ }
+ } else if (add) {
struct interface *c;
list_for_each_entry(c, &interfaces, head) {
- if (c->ndp == RELAYD_RELAY && iface != c) {
+ if (iface == c)
+ continue;
+
+ if (c->ndp == RELAYD_RELAY) {
+ req.nh.nlmsg_type = RTM_NEWNEIGH;
+ req.nh.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
+
+ req.ndm.ndm_ifindex = c->ifindex;
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ } else { // Delete NDP cache from interfaces without relay
+ req.nh.nlmsg_type = RTM_DELNEIGH;
+ req.nh.nlmsg_flags &= ~(NLM_F_CREATE | NLM_F_REPLACE);
+
req.ndm.ndm_ifindex = c->ifindex;
send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
}
}
}
- if (is_addr && iface->ra == RELAYD_SERVER)
- raise(SIGUSR1); // Inform about a change in addresses
+ if (is_addr) {
+ if (iface->ra == RELAYD_SERVER)
+ raise(SIGUSR1); // Inform about a change in addresses
- if (is_addr && iface->dhcpv6 == RELAYD_SERVER)
- iface->ia_reconf = true;
+ if (iface->dhcpv6 == RELAYD_SERVER)
+ iface->ia_reconf = true;
+ } else if (is_route) {
+ if (iface->ndp == RELAYD_RELAY && iface->master) {
+ // Replay on-link route changes on all slave interfaces
+ nh->nlmsg_flags = NLM_F_REQUEST;
- if (iface->ndp == RELAYD_RELAY && is_addr && iface->master) {
- // Replay address changes on all slave interfaces
- nh->nlmsg_flags = NLM_F_REQUEST;
+ if (nh->nlmsg_type == RTM_NEWROUTE)
+ nh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
- if (nh->nlmsg_type == RTM_NEWADDR)
- nh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
-
- struct interface *c;
- list_for_each_entry(c, &interfaces, head) {
- if (c->ndp == RELAYD_RELAY && !c->master) {
- ifa->ifa_index = c->ifindex;
- send(rtnl_event.uloop.fd, nh, nh->nlmsg_len, MSG_DONTWAIT);
+ struct interface *c;
+ list_for_each_entry(c, &interfaces, head) {
+ if (c->ndp == RELAYD_RELAY && !c->master) {
+ *ifindex = c->ifindex;
+ *metric = (*metric & 0xffff) | (c->ifindex << 16);
+ send(rtnl_event.uloop.fd, nh, nh->nlmsg_len, MSG_DONTWAIT);
+ }
}
}
}
}
- if (dump_neigh) {
- struct {
- struct nlmsghdr nh;
- struct ndmsg ndm;
- } req = {
- {sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP,
- ++rtnl_seqid, 0},
- {.ndm_family = AF_INET6}
- };
- send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
- }
+ if (dump_neigh)
+ dump_neigh_table(false);
}
projects / project / odhcpd.git / blobdiff