4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <sys/socket.h>
30 #include <arpa/inet.h>
32 #include <linux/types.h>
33 #include <linux/netlink.h>
34 #include <linux/rtnetlink.h>
36 #include <linux/if_arp.h>
38 #include <libdaemon/dlog.h>
40 #include <avahi-common/llist.h>
41 #include <avahi-common/malloc.h>
44 #include <linux/if_addr.h>
45 #define IFLA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
49 #include <linux/if_addr.h>
50 #define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
56 static int ifindex = -1;
58 typedef struct Address Address;
62 AVAHI_LLIST_FIELDS(Address, addresses);
65 AVAHI_LLIST_HEAD(Address, addresses) = NULL;
67 int iface_init(int i) {
68 struct sockaddr_nl addr;
70 if ((fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
71 daemon_log(LOG_ERR, "socket(PF_NETLINK): %s", strerror(errno));
75 memset(&addr, 0, sizeof(addr));
76 addr.nl_family = AF_NETLINK;
77 addr.nl_groups = RTMGRP_LINK|RTMGRP_IPV4_IFADDR;
78 addr.nl_pid = getpid();
80 if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
81 daemon_log(LOG_ERR, "bind(): %s", strerror(errno));
98 static int process_nlmsg(struct nlmsghdr *n) {
101 if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
102 /* A link appeared or was removed */
104 struct ifinfomsg *ifi;
107 if (ifi->ifi_family != AF_UNSPEC || ifi->ifi_index != ifindex)
110 if (n->nlmsg_type == RTM_DELLINK) {
111 daemon_log(LOG_ERR, "Interface vanished.");
115 assert(n->nlmsg_type == RTM_NEWLINK);
117 if ((ifi->ifi_flags & IFF_LOOPBACK) ||
118 (ifi->ifi_flags & IFF_NOARP) ||
119 ifi->ifi_type != ARPHRD_ETHER) {
120 daemon_log(LOG_ERR, "Interface not suitable.");
124 } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
126 /* An address was added or removed */
128 struct rtattr *a = NULL;
129 struct ifaddrmsg *ifa;
131 uint32_t address = 0;
136 if (ifa->ifa_family != AF_INET || ifa->ifa_index != ifindex)
139 l = NLMSG_PAYLOAD(n, sizeof(*ifa));
142 while(RTA_OK(a, l)) {
144 switch(a->rta_type) {
147 assert(RTA_PAYLOAD(a) == 4);
148 memcpy(&address, RTA_DATA(a), sizeof(uint32_t));
155 if (!address || is_ll_address(address))
158 for (i = addresses; i; i = i->addresses_next)
159 if (i->address == address)
162 if (n->nlmsg_type == RTM_DELADDR && i) {
163 AVAHI_LLIST_REMOVE(Address, addresses, addresses, i);
165 } if (n->nlmsg_type == RTM_NEWADDR && !i) {
166 i = avahi_new(Address, 1);
167 i->address = address;
168 AVAHI_LLIST_PREPEND(Address, addresses, addresses, i);
175 static int process_response(int wait_for_done, unsigned seq) {
182 struct nlmsghdr *p = (struct nlmsghdr *) replybuf;
184 if ((r = recv(fd, replybuf, sizeof(replybuf), 0)) < 0) {
185 daemon_log(LOG_ERR, "recv() failed: %s", strerror(errno));
191 for (; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
193 if (!NLMSG_OK(p, bytes) || bytes < sizeof(struct nlmsghdr) || bytes < p->nlmsg_len) {
194 daemon_log(LOG_ERR, "Netlink packet too small.");
198 if (p->nlmsg_type == NLMSG_DONE && wait_for_done && p->nlmsg_seq == seq && (pid_t) p->nlmsg_pid == getpid())
201 if (p->nlmsg_type == NLMSG_ERROR) {
202 struct nlmsgerr *e = (struct nlmsgerr *) NLMSG_DATA (p);
205 daemon_log(LOG_ERR, "Netlink error: %s", strerror(-e->error));
210 if (process_nlmsg(p) < 0)
213 } while (wait_for_done);
218 int iface_get_initial_state(State *state) {
220 struct ifinfomsg *ifi;
221 struct ifaddrmsg *ifa;
228 memset(&req, 0, sizeof(req));
229 n = (struct nlmsghdr*) req;
230 n->nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
231 n->nlmsg_type = RTM_GETLINK;
233 n->nlmsg_flags = NLM_F_MATCH|NLM_F_REQUEST|NLM_F_ACK;
237 ifi->ifi_family = AF_UNSPEC;
238 ifi->ifi_change = -1;
240 if (send(fd, n, n->nlmsg_len, 0) < 0) {
241 daemon_log(LOG_ERR, "send(): %s", strerror(errno));
245 if (process_response(1, 0) < 0)
248 n->nlmsg_type = RTM_GETADDR;
249 n->nlmsg_len = NLMSG_LENGTH(sizeof(*ifa));
250 n->nlmsg_seq = ++seq;
253 ifa->ifa_family = AF_INET;
254 ifa->ifa_index = ifindex;
256 if (send(fd, n, n->nlmsg_len, 0) < 0) {
257 daemon_log(LOG_ERR, "send(): %s", strerror(errno));
261 if (process_response(1, seq) < 0)
264 *state = addresses ? STATE_SLEEPING : STATE_START;
269 int iface_process(Event *event) {
275 if (process_response(0, 0) < 0)
279 *event = EVENT_ROUTABLE_ADDR_UNCONFIGURED;
280 else if (!b && addresses)
281 *event = EVENT_ROUTABLE_ADDR_CONFIGURED;
286 void iface_done(void) {
294 while ((a = addresses)) {
295 AVAHI_LLIST_REMOVE(Address, addresses, addresses, a);