7 #include <sys/socket.h>
9 #include <linux/netlink.h>
10 #include <linux/rtnetlink.h>
11 #include <i18n/i18n.h>
14 #include <list/list.h>
15 #include <file/file.h>
16 #include <types/types.h>
17 #include <talloc/talloc.h>
18 #include <waiter/waiter.h>
19 #include <process/process.h>
20 #include <system/system.h>
25 #include "device-handler.h"
29 #define PIDFILE_BASE (LOCAL_STATE_DIR "/petitboot/")
30 #define INITIAL_BUFSIZE 4096
32 #define for_each_nlmsg(buf, nlmsg, len) \
33 for (nlmsg = (struct nlmsghdr *)buf; \
34 NLMSG_OK(nlmsg, len) && nlmsg->nlmsg_type != NLMSG_DONE; \
35 nlmsg = NLMSG_NEXT(nlmsg, len))
37 #define for_each_rta(buf, rta, attrlen) \
38 for (rta = (struct rtattr *)(buf); RTA_OK(rta, attrlen); \
39 rta = RTA_NEXT(rta, attrlen))
45 uint8_t hwaddr[HWADDR_SIZE];
49 IFSTATE_UP_WAITING_LINK,
54 struct list_item list;
55 struct process *udhcpc_process;
56 struct discover_device *dev;
60 struct list interfaces;
61 struct device_handler *handler;
62 struct waiter *waiter;
65 unsigned int netlink_buf_size;
70 static char *mac_bytes_to_string(void *ctx, uint8_t *addr, int len)
72 const int l = strlen("xx:");
77 return talloc_strdup(ctx, "");
79 buf = talloc_array(ctx, char, (len * l) + 1);
81 for (i = 0; i < len; i++)
82 sprintf(buf + (l * i), "%02x:", addr[i]);
84 *(buf + (l * len) - 1) = '\0';
89 static const struct interface_config *find_config_by_hwaddr(
92 const struct config *config;
95 config = config_get();
99 for (i = 0; i < config->network.n_interfaces; i++) {
100 struct interface_config *ifconf = config->network.interfaces[i];
102 if (!memcmp(ifconf->hwaddr, hwaddr, HWADDR_SIZE))
109 static struct interface *find_interface_by_ifindex(struct network *network,
112 struct interface *interface;
114 list_for_each_entry(&network->interfaces, interface, list)
115 if (interface->ifindex == ifindex)
121 static struct interface *find_interface_by_name(struct network *network,
124 struct interface *interface;
126 list_for_each_entry(&network->interfaces, interface, list)
127 if (!strcmp(interface->name, name))
133 static struct interface *find_interface_by_uuid(struct network *network,
136 struct interface *interface;
139 list_for_each_entry(&network->interfaces, interface, list) {
140 mac = mac_bytes_to_string(interface, interface->hwaddr,
141 sizeof(interface->hwaddr));
142 if (!strcmp(mac, uuid)) {
152 uint8_t *find_mac_by_name(void *ctx, struct network *network,
155 struct interface *interface;
157 interface = find_interface_by_name(network, name);
161 return talloc_memdup(ctx, &interface->hwaddr,
162 sizeof(uint8_t) * HWADDR_SIZE);
165 static int network_init_netlink(struct network *network)
167 struct sockaddr_nl addr;
170 memset(&addr, 0, sizeof(addr));
171 addr.nl_family = AF_NETLINK;
172 addr.nl_groups = RTMGRP_LINK;
174 network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
175 if (network->netlink_sd < 0) {
176 perror("socket(AF_NETLINK)");
180 rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
182 perror("bind(sockaddr_nl)");
183 close(network->netlink_sd);
187 network->netlink_buf_size = INITIAL_BUFSIZE;
188 network->netlink_buf = talloc_array(network, char,
189 network->netlink_buf_size);
194 static int network_send_link_query(struct network *network)
198 struct nlmsghdr nlmsg;
199 struct rtgenmsg rtmsg;
202 memset(&msg, 0, sizeof(msg));
204 msg.nlmsg.nlmsg_len = sizeof(msg);
205 msg.nlmsg.nlmsg_type = RTM_GETLINK;
206 msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
207 msg.nlmsg.nlmsg_seq = 0;
208 msg.nlmsg.nlmsg_pid = 0;
209 msg.rtmsg.rtgen_family = AF_UNSPEC;
211 rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
212 if (rc != sizeof(msg))
218 static void create_interface_dev(struct network *network,
219 struct interface *interface)
221 char *uuid = mac_bytes_to_string(interface, interface->hwaddr,
222 sizeof(interface->hwaddr));
224 interface->dev = discover_device_create(network->handler, uuid,
226 interface->dev->device->type = DEVICE_TYPE_NETWORK;
227 device_handler_add_device(network->handler, interface->dev);
231 static void remove_interface(struct network *network,
232 struct interface *interface)
235 device_handler_remove(network->handler, interface->dev);
236 list_remove(&interface->list);
237 talloc_free(interface);
240 void network_register_device(struct network *network,
241 struct discover_device *dev)
243 struct interface *iface;
246 iface = find_interface_by_uuid(network, dev->uuid);
248 iface = find_interface_by_name(network, dev->label);
253 dev->uuid = mac_bytes_to_string(iface->dev, iface->hwaddr,
254 sizeof(iface->hwaddr));
257 void network_unregister_device(struct network *network,
258 struct discover_device *dev)
260 struct interface *iface;
262 iface = find_interface_by_uuid(network, dev->uuid);
269 static int interface_change(struct interface *interface, bool up)
271 const char *statestr = up ? "up" : "down";
274 if (!up && interface->udhcpc_process) {
275 /* we don't care about the callback from here */
276 interface->udhcpc_process->exit_cb = NULL;
277 interface->udhcpc_process->data = NULL;
278 process_stop_async(interface->udhcpc_process);
279 process_release(interface->udhcpc_process);
283 rc = process_run_simple(interface, pb_system_apps.ip,
284 "address", "flush", "dev", interface->name,
287 pb_log("failed to flush addresses from interface %s\n",
291 rc = process_run_simple(interface, pb_system_apps.ip,
292 "link", "set", interface->name, statestr, NULL);
294 pb_log("failed to bring interface %s %s\n", interface->name,
301 static int interface_up(struct interface *interface)
303 return interface_change(interface, true);
306 static int interface_down(struct interface *interface)
308 return interface_change(interface, false);
311 static void udhcpc_process_exit(struct process *process)
313 struct interface *interface = process->data;
314 pb_debug("udhcp client [pid %d] for interface %s exited, rc %d\n",
315 process->pid, interface->name, process->exit_status);
316 interface->udhcpc_process = NULL;
317 process_release(process);
320 static void configure_interface_dhcp(struct network *network,
321 struct interface *interface)
323 const struct platform *platform;
324 char pidfile[256], id[10];
325 struct process *process;
327 const char *argv[] = {
328 pb_system_apps.udhcpc,
332 "-O", "pxepathprefix",
334 "-i", interface->name,
335 "-x", id, /* [11,12] - dhcp client identifier */
339 device_handler_status_dev_info(network->handler, interface->dev,
340 _("Configuring with DHCP"));
342 snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
343 PIDFILE_BASE, interface->name);
345 platform = platform_get();
346 if (platform && platform->dhcp_arch_id != 0xffff)
347 snprintf(id, sizeof(id), "0x5d:%04x", platform->dhcp_arch_id);
351 process = process_create(interface);
353 process->path = pb_system_apps.udhcpc;
354 process->argv = argv;
355 process->exit_cb = udhcpc_process_exit;
356 process->data = interface;
358 rc = process_run_async(process);
361 process_release(process);
363 interface->udhcpc_process = process;
368 static void configure_interface_static(struct network *network,
369 struct interface *interface,
370 const struct interface_config *config)
374 device_handler_status_dev_info(network->handler, interface->dev,
375 _("Configuring with static address (ip: %s)"),
376 config->static_config.address);
378 rc = process_run_simple(interface, pb_system_apps.ip,
379 "address", "add", config->static_config.address,
380 "dev", interface->name, NULL);
384 pb_log("failed to add address %s to interface %s\n",
385 config->static_config.address,
390 system_info_set_interface_address(sizeof(interface->hwaddr),
392 config->static_config.address);
394 /* we need the interface up before we can route through it */
395 rc = interface_up(interface);
399 if (config->static_config.gateway)
400 rc = process_run_simple(interface, pb_system_apps.ip,
401 "route", "add", "default",
402 "via", config->static_config.gateway,
406 pb_log("failed to add default route %s on interface %s\n",
407 config->static_config.gateway,
411 if (config->static_config.url) {
412 pb_log("config URL %s\n", config->static_config.url);
413 device_handler_process_url(network->handler,
414 config->static_config.url,
415 mac_bytes_to_string(interface->dev,
417 sizeof(interface->hwaddr)),
418 config->static_config.address);
424 static void configure_interface(struct network *network,
425 struct interface *interface, bool up, bool link)
427 const struct interface_config *config = NULL;
429 if (interface->state == IFSTATE_IGNORED)
432 /* old interface? check that we're still up and running */
433 if (interface->state == IFSTATE_CONFIGURED) {
435 interface->state = IFSTATE_NEW;
437 interface->state = IFSTATE_UP_WAITING_LINK;
439 pb_debug("network: skipping configured interface %s\n",
445 /* always up the lookback, no other handling required */
446 if (!strcmp(interface->name, "lo")) {
447 if (interface->state == IFSTATE_NEW)
448 interface_up(interface);
449 interface->state = IFSTATE_CONFIGURED;
453 config = find_config_by_hwaddr(interface->hwaddr);
454 if (config && config->ignore) {
455 pb_log("network: ignoring interface %s\n", interface->name);
456 interface->state = IFSTATE_IGNORED;
460 /* if we're in manual config mode, we need an interface configuration */
461 if (network->manual_config && !config) {
462 interface->state = IFSTATE_IGNORED;
463 pb_log("network: skipping %s: manual config mode, "
464 "but no config for this interface\n",
469 /* new interface? bring up to the point so we can detect a link */
470 if (interface->state == IFSTATE_NEW) {
472 interface_up(interface);
473 pb_log("network: bringing up interface %s\n",
478 interface->state = IFSTATE_UP_WAITING_LINK;
482 /* no link? wait for a notification */
483 if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
486 pb_log("network: configuring interface %s\n", interface->name);
488 if (!config || config->method == CONFIG_METHOD_DHCP) {
489 configure_interface_dhcp(network, interface);
491 } else if (config->method == CONFIG_METHOD_STATIC) {
492 configure_interface_static(network, interface, config);
493 /* Nothing left to do for static interfaces */
494 pending_network_jobs_start();
497 interface->state = IFSTATE_CONFIGURED;
500 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
502 bool have_ifaddr, have_ifname;
503 struct interface *interface, *tmp;
504 struct ifinfomsg *info;
508 char ifname[IFNAMSIZ+1];
512 /* we're only interested in NEWLINK messages */
513 type = nlmsg->nlmsg_type;
514 if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
517 info = NLMSG_DATA(nlmsg);
519 have_ifaddr = have_ifname = false;
522 attrlen = nlmsg->nlmsg_len - sizeof(*info);
524 /* extract the interface name and hardware address attributes */
525 for_each_rta(info + 1, attr, attrlen) {
526 void *data = RTA_DATA(attr);
528 switch (attr->rta_type) {
530 memcpy(ifaddr, data, sizeof(ifaddr));
535 strncpy(ifname, data, IFNAMSIZ);
540 mtu = *(unsigned int *)data;
545 if (!have_ifaddr || !have_ifname)
548 if (type == RTM_DELLINK || mtu == 0) {
549 interface = find_interface_by_ifindex(network, info->ifi_index);
552 pb_log("network: interface %s removed\n", interface->name);
553 remove_interface(network, interface);
557 /* ignore the default tun device in some environments */
558 if (strncmp(ifname, "tun", strlen("tun")) == 0)
561 interface = find_interface_by_ifindex(network, info->ifi_index);
563 interface = talloc_zero(network, struct interface);
564 interface->ifindex = info->ifi_index;
565 interface->state = IFSTATE_NEW;
566 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
567 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
569 list_for_each_entry(&network->interfaces, tmp, list)
570 if (memcmp(interface->hwaddr, tmp->hwaddr,
571 sizeof(interface->hwaddr)) == 0) {
572 pb_log("%s: %s has duplicate MAC address, ignoring\n",
573 __func__, interface->name);
574 talloc_free(interface);
578 list_add(&network->interfaces, &interface->list);
579 create_interface_dev(network, interface);
582 /* A repeated RTM_NEWLINK can represent an interface name change */
583 if (strncmp(interface->name, ifname, IFNAMSIZ)) {
584 pb_debug("ifname update: %s -> %s\n", interface->name, ifname);
585 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
586 talloc_free(interface->dev->device->id);
587 interface->dev->device->id =
588 talloc_strdup(interface->dev->device, ifname);
591 /* notify the sysinfo code about changes to this interface */
592 if (strcmp(interface->name, "lo"))
593 system_info_register_interface(
594 sizeof(interface->hwaddr),
595 interface->hwaddr, interface->name,
596 info->ifi_flags & IFF_LOWER_UP);
599 create_interface_dev(network, interface);
601 configure_interface(network, interface,
602 info->ifi_flags & IFF_UP,
603 info->ifi_flags & IFF_LOWER_UP);
608 static int network_netlink_process(void *arg)
610 struct network *network = arg;
611 struct nlmsghdr *nlmsg;
617 memset(&msg, 0, sizeof(msg));
624 iov.iov_len = network->netlink_buf_size;
625 iov.iov_base = network->netlink_buf;
627 rc = recvmsg(network->netlink_sd, &msg, flags);
630 perror("netlink recv header");
636 /* if the netlink message was larger than our buffer, realloc
637 * before reading again */
638 if (len > network->netlink_buf_size || msg.msg_flags & MSG_TRUNC) {
639 network->netlink_buf_size *= 2;
640 network->netlink_buf = talloc_realloc(network,
641 network->netlink_buf,
643 network->netlink_buf_size);
647 /* otherwise, we're good to read the entire message without PEEK */
648 if (flags == MSG_PEEK) {
653 for_each_nlmsg(network->netlink_buf, nlmsg, len)
654 network_handle_nlmsg(network, nlmsg);
659 static void network_init_dns(struct network *network)
661 const struct config *config;
667 if (network->dry_run)
670 config = config_get();
671 if (!config || !config->network.n_dns_servers)
674 rc = read_file(network, "/etc/resolv.conf", &buf, &len);
677 buf = talloc_strdup(network, "");
683 for (i = 0; i < config->network.n_dns_servers; i++) {
687 dns_conf = talloc_asprintf(network, "nameserver %s\n",
688 config->network.dns_servers[i]);
690 if (strstr(buf, dns_conf)) {
691 talloc_free(dns_conf);
695 dns_conf_len = strlen(dns_conf);
696 buf = talloc_realloc(network, buf, char, len + dns_conf_len + 1);
697 memcpy(buf + len, dns_conf, dns_conf_len);
702 talloc_free(dns_conf);
706 rc = replace_file("/etc/resolv.conf", buf, len);
708 pb_log("error replacing resolv.conf: %s\n",
715 struct network *network_init(struct device_handler *handler,
716 struct waitset *waitset, bool dry_run)
718 struct network *network;
721 network = talloc(handler, struct network);
722 list_init(&network->interfaces);
723 network->handler = handler;
724 network->dry_run = dry_run;
725 network->manual_config = config_get()->network.n_interfaces != 0;
727 network_init_dns(network);
729 rc = network_init_netlink(network);
733 network->waiter = waiter_register_io(waitset, network->netlink_sd,
734 WAIT_IN, network_netlink_process, network);
736 if (!network->waiter)
739 rc = network_send_link_query(network);
746 network_shutdown(network);
750 int network_shutdown(struct network *network)
752 struct interface *interface;
755 waiter_remove(network->waiter);
757 list_for_each_entry(&network->interfaces, interface, list) {
758 if (interface->state == IFSTATE_IGNORED)
760 if (!strcmp(interface->name, "lo"))
762 interface_down(interface);
765 close(network->netlink_sd);
766 talloc_free(network);