7 #include <sys/socket.h>
9 #include <linux/netlink.h>
10 #include <linux/rtnetlink.h>
13 #include <list/list.h>
14 #include <types/types.h>
15 #include <talloc/talloc.h>
16 #include <waiter/waiter.h>
17 #include <pb-config/pb-config.h>
18 #include <process/process.h>
19 #include <system/system.h>
24 #include "device-handler.h"
27 #define PIDFILE_BASE (LOCAL_STATE_DIR "/petitboot/")
29 #define for_each_nlmsg(buf, nlmsg, len) \
30 for (nlmsg = (struct nlmsghdr *)buf; \
31 NLMSG_OK(nlmsg, len) && nlmsg->nlmsg_type != NLMSG_DONE; \
32 nlmsg = NLMSG_NEXT(nlmsg, len))
34 #define for_each_rta(buf, rta, attrlen) \
35 for (rta = (struct rtattr *)(buf); RTA_OK(rta, attrlen); \
36 rta = RTA_NEXT(rta, attrlen))
42 uint8_t hwaddr[HWADDR_SIZE];
46 IFSTATE_UP_WAITING_LINK,
51 struct list_item list;
52 struct process *udhcpc_process;
53 struct discover_device *dev;
57 struct list interfaces;
58 struct device_handler *handler;
59 struct waiter *waiter;
65 static const struct interface_config *find_config_by_hwaddr(
68 const struct config *config;
71 config = config_get();
75 for (i = 0; i < config->network.n_interfaces; i++) {
76 struct interface_config *ifconf = config->network.interfaces[i];
78 if (!memcmp(ifconf->hwaddr, hwaddr, HWADDR_SIZE))
85 static struct interface *find_interface_by_ifindex(struct network *network,
88 struct interface *interface;
90 list_for_each_entry(&network->interfaces, interface, list)
91 if (interface->ifindex == ifindex)
97 static int network_init_netlink(struct network *network)
99 struct sockaddr_nl addr;
102 memset(&addr, 0, sizeof(addr));
103 addr.nl_family = AF_NETLINK;
104 addr.nl_groups = RTMGRP_LINK;
106 network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
107 if (network->netlink_sd < 0) {
108 perror("socket(AF_NETLINK)");
112 rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
114 perror("bind(sockaddr_nl)");
115 close(network->netlink_sd);
122 static int network_send_link_query(struct network *network)
126 struct nlmsghdr nlmsg;
127 struct rtgenmsg rtmsg;
130 memset(&msg, 0, sizeof(msg));
132 msg.nlmsg.nlmsg_len = sizeof(msg);
133 msg.nlmsg.nlmsg_type = RTM_GETLINK;
134 msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
135 msg.nlmsg.nlmsg_seq = 0;
136 msg.nlmsg.nlmsg_pid = 0;
137 msg.rtmsg.rtgen_family = AF_UNSPEC;
139 rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
140 if (rc != sizeof(msg))
146 static void add_interface(struct network *network,
147 struct interface *interface)
149 list_add(&network->interfaces, &interface->list);
150 interface->dev = discover_device_create(network->handler,
152 interface->dev->device->type = DEVICE_TYPE_NETWORK;
153 device_handler_add_device(network->handler, interface->dev);
156 static void remove_interface(struct network *network,
157 struct interface *interface)
159 device_handler_remove(network->handler, interface->dev);
160 list_remove(&interface->list);
161 talloc_free(interface);
164 static int interface_change(struct interface *interface, bool up)
166 const char *statestr = up ? "up" : "down";
169 if (!up && interface->udhcpc_process) {
170 /* we don't care about the callback from here */
171 interface->udhcpc_process->exit_cb = NULL;
172 interface->udhcpc_process->data = NULL;
173 process_stop_async(interface->udhcpc_process);
174 process_release(interface->udhcpc_process);
177 rc = process_run_simple(interface, pb_system_apps.ip,
178 "link", "set", interface->name, statestr, NULL);
180 pb_log("failed to bring interface %s %s\n", interface->name,
187 static int interface_up(struct interface *interface)
189 return interface_change(interface, true);
192 static int interface_down(struct interface *interface)
194 return interface_change(interface, false);
197 static void udhcpc_process_exit(struct process *process)
199 struct interface *interface = process->data;
200 pb_log("udhcp client [pid %d] for interface %s exited, rc %d\n",
201 process->pid, interface->name, process->exit_status);
202 interface->udhcpc_process = NULL;
203 process_release(process);
206 static void configure_interface_dhcp(struct interface *interface)
208 struct process *process;
211 const char *argv[] = {
212 pb_system_apps.udhcpc,
216 "-i", interface->name,
219 snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
220 PIDFILE_BASE, interface->name);
222 process = process_create(interface);
224 process->path = pb_system_apps.udhcpc;
225 process->argv = argv;
226 process->exit_cb = udhcpc_process_exit;
227 process->data = interface;
229 rc = process_run_async(process);
232 process_release(process);
234 interface->udhcpc_process = process;
239 static void configure_interface_static(struct interface *interface,
240 const struct interface_config *config)
244 rc = process_run_simple(interface, pb_system_apps.ip,
245 "address", "add", config->static_config.address,
246 "dev", interface->name, NULL);
250 pb_log("failed to add address %s to interface %s\n",
251 config->static_config.address,
256 /* we need the interface up before we can route through it */
257 rc = interface_up(interface);
261 if (config->static_config.gateway)
262 rc = process_run_simple(interface, pb_system_apps.ip,
263 "route", "add", "default",
264 "via", config->static_config.gateway,
268 pb_log("failed to add default route %s on interface %s\n",
269 config->static_config.gateway,
276 static void configure_interface(struct network *network,
277 struct interface *interface, bool up, bool link)
279 const struct interface_config *config = NULL;
281 if (interface->state == IFSTATE_IGNORED)
284 /* old interface? check that we're still up and running */
285 if (interface->state == IFSTATE_CONFIGURED) {
287 interface->state = IFSTATE_NEW;
289 interface->state = IFSTATE_UP_WAITING_LINK;
294 /* always up the lookback, no other handling required */
295 if (!strcmp(interface->name, "lo")) {
296 if (interface->state == IFSTATE_NEW)
297 interface_up(interface);
298 interface->state = IFSTATE_CONFIGURED;
302 config = find_config_by_hwaddr(interface->hwaddr);
303 if (config && config->ignore) {
304 pb_log("network: ignoring interface %s\n", interface->name);
305 interface->state = IFSTATE_IGNORED;
309 /* if we're in manual config mode, we need an interface configuration */
310 if (network->manual_config && !config) {
311 interface->state = IFSTATE_IGNORED;
312 pb_log("network: skipping %s: manual config mode, "
313 "but no config for this interface\n",
318 /* new interface? bring up to the point so we can detect a link */
319 if (interface->state == IFSTATE_NEW) {
321 interface_up(interface);
322 pb_log("network: bringing up interface %s\n",
327 interface->state = IFSTATE_UP_WAITING_LINK;
331 /* no link? wait for a notification */
332 if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
335 pb_log("network: configuring interface %s\n", interface->name);
337 if (!config || config->method == CONFIG_METHOD_DHCP) {
338 configure_interface_dhcp(interface);
340 } else if (config->method == CONFIG_METHOD_STATIC) {
341 configure_interface_static(interface, config);
345 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
347 bool have_ifaddr, have_ifname;
348 struct interface *interface;
349 struct ifinfomsg *info;
353 char ifname[IFNAMSIZ+1];
357 /* we're only interested in NEWLINK messages */
358 type = nlmsg->nlmsg_type;
359 if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
362 info = NLMSG_DATA(nlmsg);
364 have_ifaddr = have_ifname = false;
366 attrlen = nlmsg->nlmsg_len - sizeof(*info);
368 /* extract the interface name and hardware address attributes */
369 for_each_rta(info + 1, attr, attrlen) {
370 void *data = RTA_DATA(attr);
372 switch (attr->rta_type) {
374 memcpy(ifaddr, data, sizeof(ifaddr));
379 strncpy(ifname, data, IFNAMSIZ);
384 mtu = *(unsigned int *)data;
389 if (!have_ifaddr || !have_ifname)
392 if (type == RTM_DELLINK || mtu == 0) {
393 interface = find_interface_by_ifindex(network, info->ifi_index);
396 pb_log("network: interface %s removed\n", interface->name);
397 remove_interface(network, interface);
402 interface = find_interface_by_ifindex(network, info->ifi_index);
404 interface = talloc_zero(network, struct interface);
405 interface->ifindex = info->ifi_index;
406 interface->state = IFSTATE_NEW;
407 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
408 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
409 add_interface(network, interface);
411 /* tell the sysinfo code about this interface */
412 if (strcmp(interface->name, "lo"))
413 system_info_register_interface(
414 sizeof(interface->hwaddr),
415 interface->hwaddr, interface->name);
418 configure_interface(network, interface,
419 info->ifi_flags & IFF_UP,
420 info->ifi_flags & IFF_LOWER_UP);
425 static int network_netlink_process(void *arg)
427 struct network *network = arg;
428 struct nlmsghdr *nlmsg;
433 rc = recv(network->netlink_sd, buf, sizeof(buf), 0);
435 perror("netlink recv");
441 for_each_nlmsg(buf, nlmsg, len)
442 network_handle_nlmsg(network, nlmsg);
447 static void network_init_dns(struct network *network)
449 const struct config *config;
454 if (network->dry_run)
457 config = config_get();
458 if (!config || !config->network.n_dns_servers)
461 rc = read_file(network, "/etc/resolv.conf", &buf, &len);
464 buf = talloc_strdup(network, "");
470 for (i = 0; i < config->network.n_dns_servers; i++) {
474 dns_conf = talloc_asprintf(network, "nameserver %s\n",
475 config->network.dns_servers[i]);
477 if (strstr(buf, dns_conf)) {
478 talloc_free(dns_conf);
482 dns_conf_len = strlen(dns_conf);
483 buf = talloc_realloc(network, buf, char, len + dns_conf_len);
484 memcpy(buf + len, dns_conf, dns_conf_len);
488 talloc_free(dns_conf);
492 rc = replace_file("/etc/resolv.conf", buf, len);
494 pb_log("error replacing resolv.conf: %s\n",
501 struct network *network_init(struct device_handler *handler,
502 struct waitset *waitset, bool dry_run)
504 struct network *network;
507 network = talloc(handler, struct network);
508 list_init(&network->interfaces);
509 network->handler = handler;
510 network->manual_config = false;
511 network->dry_run = dry_run;
513 network_init_dns(network);
515 rc = network_init_netlink(network);
519 network->waiter = waiter_register_io(waitset, network->netlink_sd,
520 WAIT_IN, network_netlink_process, network);
522 if (!network->waiter)
525 rc = network_send_link_query(network);
532 network_shutdown(network);
537 int network_shutdown(struct network *network)
539 struct interface *interface;
542 waiter_remove(network->waiter);
544 list_for_each_entry(&network->interfaces, interface, list)
545 interface_down(interface);
547 close(network->netlink_sd);
548 talloc_free(network);