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/")
28 #define INITIAL_BUFSIZE 4096
30 #define for_each_nlmsg(buf, nlmsg, len) \
31 for (nlmsg = (struct nlmsghdr *)buf; \
32 NLMSG_OK(nlmsg, len) && nlmsg->nlmsg_type != NLMSG_DONE; \
33 nlmsg = NLMSG_NEXT(nlmsg, len))
35 #define for_each_rta(buf, rta, attrlen) \
36 for (rta = (struct rtattr *)(buf); RTA_OK(rta, attrlen); \
37 rta = RTA_NEXT(rta, attrlen))
43 uint8_t hwaddr[HWADDR_SIZE];
47 IFSTATE_UP_WAITING_LINK,
52 struct list_item list;
53 struct process *udhcpc_process;
54 struct discover_device *dev;
58 struct list interfaces;
59 struct device_handler *handler;
60 struct waiter *waiter;
63 unsigned int netlink_buf_size;
68 static const struct interface_config *find_config_by_hwaddr(
71 const struct config *config;
74 config = config_get();
78 for (i = 0; i < config->network.n_interfaces; i++) {
79 struct interface_config *ifconf = config->network.interfaces[i];
81 if (!memcmp(ifconf->hwaddr, hwaddr, HWADDR_SIZE))
88 static struct interface *find_interface_by_ifindex(struct network *network,
91 struct interface *interface;
93 list_for_each_entry(&network->interfaces, interface, list)
94 if (interface->ifindex == ifindex)
100 static int network_init_netlink(struct network *network)
102 struct sockaddr_nl addr;
105 memset(&addr, 0, sizeof(addr));
106 addr.nl_family = AF_NETLINK;
107 addr.nl_groups = RTMGRP_LINK;
109 network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
110 if (network->netlink_sd < 0) {
111 perror("socket(AF_NETLINK)");
115 rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
117 perror("bind(sockaddr_nl)");
118 close(network->netlink_sd);
122 network->netlink_buf_size = INITIAL_BUFSIZE;
123 network->netlink_buf = talloc_array(network, char,
124 network->netlink_buf_size);
129 static int network_send_link_query(struct network *network)
133 struct nlmsghdr nlmsg;
134 struct rtgenmsg rtmsg;
137 memset(&msg, 0, sizeof(msg));
139 msg.nlmsg.nlmsg_len = sizeof(msg);
140 msg.nlmsg.nlmsg_type = RTM_GETLINK;
141 msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
142 msg.nlmsg.nlmsg_seq = 0;
143 msg.nlmsg.nlmsg_pid = 0;
144 msg.rtmsg.rtgen_family = AF_UNSPEC;
146 rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
147 if (rc != sizeof(msg))
153 static void add_interface(struct network *network,
154 struct interface *interface)
156 list_add(&network->interfaces, &interface->list);
157 interface->dev = discover_device_create(network->handler,
159 interface->dev->device->type = DEVICE_TYPE_NETWORK;
160 device_handler_add_device(network->handler, interface->dev);
163 static void remove_interface(struct network *network,
164 struct interface *interface)
166 device_handler_remove(network->handler, interface->dev);
167 list_remove(&interface->list);
168 talloc_free(interface);
171 static int interface_change(struct interface *interface, bool up)
173 const char *statestr = up ? "up" : "down";
176 if (!up && interface->udhcpc_process) {
177 /* we don't care about the callback from here */
178 interface->udhcpc_process->exit_cb = NULL;
179 interface->udhcpc_process->data = NULL;
180 process_stop_async(interface->udhcpc_process);
181 process_release(interface->udhcpc_process);
184 rc = process_run_simple(interface, pb_system_apps.ip,
185 "link", "set", interface->name, statestr, NULL);
187 pb_log("failed to bring interface %s %s\n", interface->name,
194 static int interface_up(struct interface *interface)
196 return interface_change(interface, true);
199 static int interface_down(struct interface *interface)
201 return interface_change(interface, false);
204 static void udhcpc_process_exit(struct process *process)
206 struct interface *interface = process->data;
207 pb_debug("udhcp client [pid %d] for interface %s exited, rc %d\n",
208 process->pid, interface->name, process->exit_status);
209 interface->udhcpc_process = NULL;
210 process_release(process);
213 static void configure_interface_dhcp(struct interface *interface)
215 struct process *process;
218 const char *argv[] = {
219 pb_system_apps.udhcpc,
224 "-i", interface->name,
227 snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
228 PIDFILE_BASE, interface->name);
230 process = process_create(interface);
232 process->path = pb_system_apps.udhcpc;
233 process->argv = argv;
234 process->exit_cb = udhcpc_process_exit;
235 process->data = interface;
237 rc = process_run_async(process);
240 process_release(process);
242 interface->udhcpc_process = process;
247 static void configure_interface_static(struct interface *interface,
248 const struct interface_config *config)
252 rc = process_run_simple(interface, pb_system_apps.ip,
253 "address", "add", config->static_config.address,
254 "dev", interface->name, NULL);
258 pb_log("failed to add address %s to interface %s\n",
259 config->static_config.address,
264 /* we need the interface up before we can route through it */
265 rc = interface_up(interface);
269 if (config->static_config.gateway)
270 rc = process_run_simple(interface, pb_system_apps.ip,
271 "route", "add", "default",
272 "via", config->static_config.gateway,
276 pb_log("failed to add default route %s on interface %s\n",
277 config->static_config.gateway,
284 static void configure_interface(struct network *network,
285 struct interface *interface, bool up, bool link)
287 const struct interface_config *config = NULL;
289 if (interface->state == IFSTATE_IGNORED)
292 /* old interface? check that we're still up and running */
293 if (interface->state == IFSTATE_CONFIGURED) {
295 interface->state = IFSTATE_NEW;
297 interface->state = IFSTATE_UP_WAITING_LINK;
302 /* always up the lookback, no other handling required */
303 if (!strcmp(interface->name, "lo")) {
304 if (interface->state == IFSTATE_NEW)
305 interface_up(interface);
306 interface->state = IFSTATE_CONFIGURED;
310 config = find_config_by_hwaddr(interface->hwaddr);
311 if (config && config->ignore) {
312 pb_log("network: ignoring interface %s\n", interface->name);
313 interface->state = IFSTATE_IGNORED;
317 /* if we're in manual config mode, we need an interface configuration */
318 if (network->manual_config && !config) {
319 interface->state = IFSTATE_IGNORED;
320 pb_log("network: skipping %s: manual config mode, "
321 "but no config for this interface\n",
326 /* new interface? bring up to the point so we can detect a link */
327 if (interface->state == IFSTATE_NEW) {
329 interface_up(interface);
330 pb_log("network: bringing up interface %s\n",
335 interface->state = IFSTATE_UP_WAITING_LINK;
339 /* no link? wait for a notification */
340 if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
343 pb_log("network: configuring interface %s\n", interface->name);
345 if (!config || config->method == CONFIG_METHOD_DHCP) {
346 configure_interface_dhcp(interface);
348 } else if (config->method == CONFIG_METHOD_STATIC) {
349 configure_interface_static(interface, config);
353 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
355 bool have_ifaddr, have_ifname;
356 struct interface *interface;
357 struct ifinfomsg *info;
361 char ifname[IFNAMSIZ+1];
365 /* we're only interested in NEWLINK messages */
366 type = nlmsg->nlmsg_type;
367 if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
370 info = NLMSG_DATA(nlmsg);
372 have_ifaddr = have_ifname = false;
375 attrlen = nlmsg->nlmsg_len - sizeof(*info);
377 /* extract the interface name and hardware address attributes */
378 for_each_rta(info + 1, attr, attrlen) {
379 void *data = RTA_DATA(attr);
381 switch (attr->rta_type) {
383 memcpy(ifaddr, data, sizeof(ifaddr));
388 strncpy(ifname, data, IFNAMSIZ);
393 mtu = *(unsigned int *)data;
398 if (!have_ifaddr || !have_ifname)
401 if (type == RTM_DELLINK || mtu == 0) {
402 interface = find_interface_by_ifindex(network, info->ifi_index);
405 pb_log("network: interface %s removed\n", interface->name);
406 remove_interface(network, interface);
411 interface = find_interface_by_ifindex(network, info->ifi_index);
413 interface = talloc_zero(network, struct interface);
414 interface->ifindex = info->ifi_index;
415 interface->state = IFSTATE_NEW;
416 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
417 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
418 add_interface(network, interface);
421 /* notify the sysinfo code about changes to this interface */
422 if (strcmp(interface->name, "lo"))
423 system_info_register_interface(
424 sizeof(interface->hwaddr),
425 interface->hwaddr, interface->name,
426 info->ifi_flags & IFF_LOWER_UP);
428 configure_interface(network, interface,
429 info->ifi_flags & IFF_UP,
430 info->ifi_flags & IFF_LOWER_UP);
435 static int network_netlink_process(void *arg)
437 struct network *network = arg;
438 struct nlmsghdr *nlmsg;
444 memset(&msg, 0, sizeof(msg));
451 iov.iov_len = network->netlink_buf_size;
452 iov.iov_base = network->netlink_buf;
454 rc = recvmsg(network->netlink_sd, &msg, flags);
457 perror("netlink recv header");
463 /* if the netlink message was larger than our buffer, realloc
464 * before reading again */
465 if (len > network->netlink_buf_size || msg.msg_flags & MSG_TRUNC) {
466 network->netlink_buf_size *= 2;
467 network->netlink_buf = talloc_realloc(network,
468 network->netlink_buf,
470 network->netlink_buf_size);
474 /* otherwise, we're good to read the entire message without PEEK */
475 if (flags == MSG_PEEK) {
480 for_each_nlmsg(network->netlink_buf, nlmsg, len)
481 network_handle_nlmsg(network, nlmsg);
486 static void network_init_dns(struct network *network)
488 const struct config *config;
494 if (network->dry_run)
497 config = config_get();
498 if (!config || !config->network.n_dns_servers)
501 rc = read_file(network, "/etc/resolv.conf", &buf, &len);
504 buf = talloc_strdup(network, "");
510 for (i = 0; i < config->network.n_dns_servers; i++) {
514 dns_conf = talloc_asprintf(network, "nameserver %s\n",
515 config->network.dns_servers[i]);
517 if (strstr(buf, dns_conf)) {
518 talloc_free(dns_conf);
522 dns_conf_len = strlen(dns_conf);
523 buf = talloc_realloc(network, buf, char, len + dns_conf_len + 1);
524 memcpy(buf + len, dns_conf, dns_conf_len);
529 talloc_free(dns_conf);
533 rc = replace_file("/etc/resolv.conf", buf, len);
535 pb_log("error replacing resolv.conf: %s\n",
542 struct network *network_init(struct device_handler *handler,
543 struct waitset *waitset, bool dry_run)
545 struct network *network;
548 network = talloc(handler, struct network);
549 list_init(&network->interfaces);
550 network->handler = handler;
551 network->dry_run = dry_run;
552 network->manual_config = config_get()->network.n_interfaces != 0;
554 network_init_dns(network);
556 rc = network_init_netlink(network);
560 network->waiter = waiter_register_io(waitset, network->netlink_sd,
561 WAIT_IN, network_netlink_process, network);
563 if (!network->waiter)
566 rc = network_send_link_query(network);
573 network_shutdown(network);
578 int network_shutdown(struct network *network)
580 struct interface *interface;
583 waiter_remove(network->waiter);
585 list_for_each_entry(&network->interfaces, interface, list)
586 interface_down(interface);
588 close(network->netlink_sd);
589 talloc_free(network);