7 #include <sys/socket.h>
9 #include <linux/netlink.h>
10 #include <linux/rtnetlink.h>
13 #include <list/list.h>
14 #include <talloc/talloc.h>
15 #include <waiter/waiter.h>
16 #include <pb-config/pb-config.h>
17 #include <process/process.h>
18 #include <system/system.h>
24 #define PIDFILE_BASE (LOCAL_STATE_DIR "/petitboot/")
26 #define for_each_nlmsg(buf, nlmsg, len) \
27 for (nlmsg = (struct nlmsghdr *)buf; \
28 NLMSG_OK(nlmsg, len) && nlmsg->nlmsg_type != NLMSG_DONE; \
29 nlmsg = NLMSG_NEXT(nlmsg, len))
31 #define for_each_rta(buf, rta, attrlen) \
32 for (rta = (struct rtattr *)(buf); RTA_OK(rta, attrlen); \
33 rta = RTA_NEXT(rta, attrlen))
39 uint8_t hwaddr[HWADDR_SIZE];
43 IFSTATE_UP_WAITING_LINK,
48 struct list_item list;
49 struct process *udhcpc_process;
53 struct list interfaces;
54 struct waiter *waiter;
60 static const struct interface_config *find_config_by_hwaddr(
63 const struct config *config;
66 config = config_get();
70 for (i = 0; i < config->network.n_interfaces; i++) {
71 struct interface_config *ifconf = config->network.interfaces[i];
73 if (!memcmp(ifconf->hwaddr, hwaddr, HWADDR_SIZE))
80 static struct interface *find_interface_by_ifindex(struct network *network,
83 struct interface *interface;
85 list_for_each_entry(&network->interfaces, interface, list)
86 if (interface->ifindex == ifindex)
92 static int network_init_netlink(struct network *network)
94 struct sockaddr_nl addr;
97 memset(&addr, 0, sizeof(addr));
98 addr.nl_family = AF_NETLINK;
99 addr.nl_groups = RTMGRP_LINK;
101 network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
102 if (network->netlink_sd < 0) {
103 perror("socket(AF_NETLINK)");
107 rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
109 perror("bind(sockaddr_nl)");
110 close(network->netlink_sd);
117 static int network_send_link_query(struct network *network)
121 struct nlmsghdr nlmsg;
122 struct rtgenmsg rtmsg;
125 memset(&msg, 0, sizeof(msg));
127 msg.nlmsg.nlmsg_len = sizeof(msg);
128 msg.nlmsg.nlmsg_type = RTM_GETLINK;
129 msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
130 msg.nlmsg.nlmsg_seq = 0;
131 msg.nlmsg.nlmsg_pid = 0;
132 msg.rtmsg.rtgen_family = AF_UNSPEC;
134 rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
135 if (rc != sizeof(msg))
141 static int interface_change(struct interface *interface, bool up)
143 const char *statestr = up ? "up" : "down";
146 if (!up && interface->udhcpc_process) {
147 /* we don't care about the callback from here */
148 interface->udhcpc_process->exit_cb = NULL;
149 interface->udhcpc_process->data = NULL;
150 process_stop_async(interface->udhcpc_process);
151 process_release(interface->udhcpc_process);
154 rc = process_run_simple(interface, pb_system_apps.ip,
155 "link", "set", interface->name, statestr, NULL);
157 pb_log("failed to bring interface %s %s\n", interface->name,
164 static int interface_up(struct interface *interface)
166 return interface_change(interface, true);
169 static int interface_down(struct interface *interface)
171 return interface_change(interface, false);
174 static void udhcpc_process_exit(struct process *process)
176 struct interface *interface = process->data;
177 pb_log("udhcp client [pid %d] for interface %s exited, rc %d\n",
178 process->pid, interface->name, process->exit_status);
179 interface->udhcpc_process = NULL;
180 process_release(process);
183 static void configure_interface_dhcp(struct interface *interface)
185 struct process *process;
188 const char *argv[] = {
189 pb_system_apps.udhcpc,
193 "-i", interface->name,
196 snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
197 PIDFILE_BASE, interface->name);
199 process = process_create(interface);
201 process->path = pb_system_apps.udhcpc;
202 process->argv = argv;
203 process->exit_cb = udhcpc_process_exit;
204 process->data = interface;
206 rc = process_run_async(process);
209 process_release(process);
211 interface->udhcpc_process = process;
216 static void configure_interface_static(struct interface *interface,
217 const struct interface_config *config)
221 rc = process_run_simple(interface, pb_system_apps.ip,
222 "address", "add", config->static_config.address,
223 "dev", interface->name, NULL);
227 pb_log("failed to add address %s to interface %s\n",
228 config->static_config.address,
233 /* we need the interface up before we can route through it */
234 rc = interface_up(interface);
238 if (config->static_config.gateway)
239 rc = process_run_simple(interface, pb_system_apps.ip,
240 "route", "add", "default",
241 "via", config->static_config.gateway,
245 pb_log("failed to add default route %s on interface %s\n",
246 config->static_config.gateway,
253 static void configure_interface(struct network *network,
254 struct interface *interface, bool up, bool link)
256 const struct interface_config *config = NULL;
258 if (interface->state == IFSTATE_IGNORED)
261 /* old interface? check that we're still up and running */
262 if (interface->state == IFSTATE_CONFIGURED) {
264 interface->state = IFSTATE_NEW;
266 interface->state = IFSTATE_UP_WAITING_LINK;
271 /* always up the lookback, no other handling required */
272 if (!strcmp(interface->name, "lo")) {
273 if (interface->state == IFSTATE_NEW)
274 interface_up(interface);
275 interface->state = IFSTATE_CONFIGURED;
279 config = find_config_by_hwaddr(interface->hwaddr);
280 if (config && config->ignore) {
281 pb_log("network: ignoring interface %s\n", interface->name);
282 interface->state = IFSTATE_IGNORED;
286 /* if we're in manual config mode, we need an interface configuration */
287 if (network->manual_config && !config) {
288 interface->state = IFSTATE_IGNORED;
289 pb_log("network: skipping %s: manual config mode, "
290 "but no config for this interface\n",
295 /* new interface? bring up to the point so we can detect a link */
296 if (interface->state == IFSTATE_NEW) {
298 interface_up(interface);
299 pb_log("network: bringing up interface %s\n",
304 interface->state = IFSTATE_UP_WAITING_LINK;
308 /* no link? wait for a notification */
309 if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
312 pb_log("network: configuring interface %s\n", interface->name);
314 if (!config || config->method == CONFIG_METHOD_DHCP) {
315 configure_interface_dhcp(interface);
317 } else if (config->method == CONFIG_METHOD_STATIC) {
318 configure_interface_static(interface, config);
322 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
324 bool have_ifaddr, have_ifname;
325 struct interface *interface;
326 struct ifinfomsg *info;
329 char ifname[IFNAMSIZ+1];
333 /* we're only interested in NEWLINK messages */
334 type = nlmsg->nlmsg_type;
335 if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
338 info = NLMSG_DATA(nlmsg);
340 have_ifaddr = have_ifname = false;
342 attrlen = nlmsg->nlmsg_len - sizeof(*info);
344 /* extract the interface name and hardware address attributes */
345 for_each_rta(info + 1, attr, attrlen) {
346 void *data = RTA_DATA(attr);
348 switch (attr->rta_type) {
350 memcpy(ifaddr, data, sizeof(ifaddr));
355 strncpy(ifname, data, IFNAMSIZ);
361 if (!have_ifaddr || !have_ifname)
364 if (type == RTM_DELLINK) {
365 interface = find_interface_by_ifindex(network, info->ifi_index);
368 pb_log("network: interface %s removed\n", interface->name);
369 list_remove(&interface->list);
370 talloc_free(interface);
375 interface = find_interface_by_ifindex(network, info->ifi_index);
377 interface = talloc_zero(network, struct interface);
378 interface->ifindex = info->ifi_index;
379 interface->state = IFSTATE_NEW;
380 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
381 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
384 configure_interface(network, interface,
385 info->ifi_flags & IFF_UP,
386 info->ifi_flags & IFF_LOWER_UP);
391 static int network_netlink_process(void *arg)
393 struct network *network = arg;
394 struct nlmsghdr *nlmsg;
399 rc = recv(network->netlink_sd, buf, sizeof(buf), 0);
401 perror("netlink recv");
407 for_each_nlmsg(buf, nlmsg, len)
408 network_handle_nlmsg(network, nlmsg);
413 static void network_init_dns(struct network *network)
415 const struct config *config;
420 if (network->dry_run)
423 config = config_get();
424 if (!config || !config->network.n_dns_servers)
427 rc = read_file(network, "/etc/resolv.conf", &buf, &len);
430 buf = talloc_strdup(network, "");
436 for (i = 0; i < config->network.n_dns_servers; i++) {
440 dns_conf = talloc_asprintf(network, "nameserver %s\n",
441 config->network.dns_servers[i]);
443 if (strstr(buf, dns_conf)) {
444 talloc_free(dns_conf);
448 dns_conf_len = strlen(dns_conf);
449 buf = talloc_realloc(network, buf, char, len + dns_conf_len);
450 memcpy(buf + len, dns_conf, dns_conf_len);
454 talloc_free(dns_conf);
458 rc = replace_file("/etc/resolv.conf", buf, len);
460 pb_log("error replacing resolv.conf: %s\n",
467 struct network *network_init(void *ctx, struct waitset *waitset, bool dry_run)
469 struct network *network;
472 network = talloc(ctx, struct network);
473 list_init(&network->interfaces);
474 network->manual_config = false;
475 network->dry_run = dry_run;
477 network_init_dns(network);
479 rc = network_init_netlink(network);
483 network->waiter = waiter_register_io(waitset, network->netlink_sd,
484 WAIT_IN, network_netlink_process, network);
486 if (!network->waiter)
489 rc = network_send_link_query(network);
496 network_shutdown(network);
501 int network_shutdown(struct network *network)
503 struct interface *interface;
506 waiter_remove(network->waiter);
508 list_for_each_entry(&network->interfaces, interface, list)
509 interface_down(interface);
511 close(network->netlink_sd);
512 talloc_free(network);