7 #include <sys/socket.h>
9 #include <linux/netlink.h>
10 #include <linux/rtnetlink.h>
13 #include <list/list.h>
14 #include <file/file.h>
15 #include <types/types.h>
16 #include <talloc/talloc.h>
17 #include <waiter/waiter.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 struct interface *find_interface_by_name(struct network *network,
103 struct interface *interface;
105 list_for_each_entry(&network->interfaces, interface, list)
106 if (!strcmp(interface->name, name))
112 uint8_t *find_mac_by_name(void *ctx, struct network *network,
115 struct interface *interface;
117 interface = find_interface_by_name(network, name);
121 return talloc_memdup(ctx, &interface->hwaddr,
122 sizeof(uint8_t) * HWADDR_SIZE);
125 static int network_init_netlink(struct network *network)
127 struct sockaddr_nl addr;
130 memset(&addr, 0, sizeof(addr));
131 addr.nl_family = AF_NETLINK;
132 addr.nl_groups = RTMGRP_LINK;
134 network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
135 if (network->netlink_sd < 0) {
136 perror("socket(AF_NETLINK)");
140 rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
142 perror("bind(sockaddr_nl)");
143 close(network->netlink_sd);
147 network->netlink_buf_size = INITIAL_BUFSIZE;
148 network->netlink_buf = talloc_array(network, char,
149 network->netlink_buf_size);
154 static int network_send_link_query(struct network *network)
158 struct nlmsghdr nlmsg;
159 struct rtgenmsg rtmsg;
162 memset(&msg, 0, sizeof(msg));
164 msg.nlmsg.nlmsg_len = sizeof(msg);
165 msg.nlmsg.nlmsg_type = RTM_GETLINK;
166 msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
167 msg.nlmsg.nlmsg_seq = 0;
168 msg.nlmsg.nlmsg_pid = 0;
169 msg.rtmsg.rtgen_family = AF_UNSPEC;
171 rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
172 if (rc != sizeof(msg))
178 static char *mac_bytes_to_string(void *ctx, uint8_t *addr, int len)
180 const int l = strlen("xx:");
185 return talloc_strdup(ctx, "");
187 buf = talloc_array(ctx, char, (len * l) + 1);
189 for (i = 0; i < len; i++)
190 sprintf(buf + (l * i), "%02x:", addr[i]);
192 *(buf + (l * len) - 1) = '\0';
197 static void add_interface(struct network *network,
198 struct interface *interface)
200 char *uuid = mac_bytes_to_string(interface, interface->hwaddr,
201 sizeof(interface->hwaddr));
203 list_add(&network->interfaces, &interface->list);
204 interface->dev = discover_device_create(network->handler, uuid,
206 interface->dev->device->type = DEVICE_TYPE_NETWORK;
207 device_handler_add_device(network->handler, interface->dev);
211 static void remove_interface(struct network *network,
212 struct interface *interface)
215 device_handler_remove(network->handler, interface->dev);
216 list_remove(&interface->list);
217 talloc_free(interface);
220 void network_register_device(struct network *network,
221 struct discover_device *dev)
223 struct interface *iface;
225 iface = find_interface_by_name(network, dev->device->id);
230 dev->uuid = mac_bytes_to_string(iface->dev, iface->hwaddr,
231 sizeof(iface->hwaddr));
234 void network_unregister_device(struct network *network,
235 struct discover_device *dev)
237 struct interface *iface;
239 iface = find_interface_by_name(network, dev->device->id);
246 static int interface_change(struct interface *interface, bool up)
248 const char *statestr = up ? "up" : "down";
251 if (!up && interface->udhcpc_process) {
252 /* we don't care about the callback from here */
253 interface->udhcpc_process->exit_cb = NULL;
254 interface->udhcpc_process->data = NULL;
255 process_stop_async(interface->udhcpc_process);
256 process_release(interface->udhcpc_process);
260 rc = process_run_simple(interface, pb_system_apps.ip,
261 "address", "flush", "dev", interface->name,
264 pb_log("failed to flush addresses from interface %s\n",
268 rc = process_run_simple(interface, pb_system_apps.ip,
269 "link", "set", interface->name, statestr, NULL);
271 pb_log("failed to bring interface %s %s\n", interface->name,
278 static int interface_up(struct interface *interface)
280 return interface_change(interface, true);
283 static int interface_down(struct interface *interface)
285 return interface_change(interface, false);
288 static void udhcpc_process_exit(struct process *process)
290 struct interface *interface = process->data;
291 pb_debug("udhcp client [pid %d] for interface %s exited, rc %d\n",
292 process->pid, interface->name, process->exit_status);
293 interface->udhcpc_process = NULL;
294 process_release(process);
297 static void configure_interface_dhcp(struct interface *interface)
299 const struct platform *platform;
300 char pidfile[256], id[10];
301 struct process *process;
303 const char *argv[] = {
304 pb_system_apps.udhcpc,
308 "-O", "pxepathprefix",
310 "-i", interface->name,
311 "-x", id, /* [11,12] - dhcp client identifier */
315 snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
316 PIDFILE_BASE, interface->name);
318 platform = platform_get();
319 if (platform && platform->dhcp_arch_id != 0xffff)
320 snprintf(id, sizeof(id), "0x5d:%04x", platform->dhcp_arch_id);
324 process = process_create(interface);
326 process->path = pb_system_apps.udhcpc;
327 process->argv = argv;
328 process->exit_cb = udhcpc_process_exit;
329 process->data = interface;
331 rc = process_run_async(process);
334 process_release(process);
336 interface->udhcpc_process = process;
341 static void configure_interface_static(struct network *network,
342 struct interface *interface,
343 const struct interface_config *config)
347 rc = process_run_simple(interface, pb_system_apps.ip,
348 "address", "add", config->static_config.address,
349 "dev", interface->name, NULL);
353 pb_log("failed to add address %s to interface %s\n",
354 config->static_config.address,
359 /* we need the interface up before we can route through it */
360 rc = interface_up(interface);
364 if (config->static_config.gateway)
365 rc = process_run_simple(interface, pb_system_apps.ip,
366 "route", "add", "default",
367 "via", config->static_config.gateway,
371 pb_log("failed to add default route %s on interface %s\n",
372 config->static_config.gateway,
376 if (config->static_config.url) {
377 pb_log("config URL %s\n", config->static_config.url);
378 device_handler_process_url(network->handler,
379 config->static_config.url,
380 mac_bytes_to_string(interface->dev,
382 sizeof(interface->hwaddr)),
383 config->static_config.address);
389 static void configure_interface(struct network *network,
390 struct interface *interface, bool up, bool link)
392 const struct interface_config *config = NULL;
394 if (interface->state == IFSTATE_IGNORED)
397 /* old interface? check that we're still up and running */
398 if (interface->state == IFSTATE_CONFIGURED) {
400 interface->state = IFSTATE_NEW;
402 interface->state = IFSTATE_UP_WAITING_LINK;
404 pb_debug("network: skipping configured interface %s\n",
410 /* always up the lookback, no other handling required */
411 if (!strcmp(interface->name, "lo")) {
412 if (interface->state == IFSTATE_NEW)
413 interface_up(interface);
414 interface->state = IFSTATE_CONFIGURED;
418 config = find_config_by_hwaddr(interface->hwaddr);
419 if (config && config->ignore) {
420 pb_log("network: ignoring interface %s\n", interface->name);
421 interface->state = IFSTATE_IGNORED;
425 /* if we're in manual config mode, we need an interface configuration */
426 if (network->manual_config && !config) {
427 interface->state = IFSTATE_IGNORED;
428 pb_log("network: skipping %s: manual config mode, "
429 "but no config for this interface\n",
434 /* new interface? bring up to the point so we can detect a link */
435 if (interface->state == IFSTATE_NEW) {
437 interface_up(interface);
438 pb_log("network: bringing up interface %s\n",
443 interface->state = IFSTATE_UP_WAITING_LINK;
447 /* no link? wait for a notification */
448 if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
451 pb_log("network: configuring interface %s\n", interface->name);
453 if (!config || config->method == CONFIG_METHOD_DHCP) {
454 configure_interface_dhcp(interface);
456 } else if (config->method == CONFIG_METHOD_STATIC) {
457 configure_interface_static(network, interface, config);
460 interface->state = IFSTATE_CONFIGURED;
463 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
465 bool have_ifaddr, have_ifname;
466 struct interface *interface;
467 struct ifinfomsg *info;
471 char ifname[IFNAMSIZ+1];
475 /* we're only interested in NEWLINK messages */
476 type = nlmsg->nlmsg_type;
477 if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
480 info = NLMSG_DATA(nlmsg);
482 have_ifaddr = have_ifname = false;
485 attrlen = nlmsg->nlmsg_len - sizeof(*info);
487 /* extract the interface name and hardware address attributes */
488 for_each_rta(info + 1, attr, attrlen) {
489 void *data = RTA_DATA(attr);
491 switch (attr->rta_type) {
493 memcpy(ifaddr, data, sizeof(ifaddr));
498 strncpy(ifname, data, IFNAMSIZ);
503 mtu = *(unsigned int *)data;
508 if (!have_ifaddr || !have_ifname)
511 if (type == RTM_DELLINK || mtu == 0) {
512 interface = find_interface_by_ifindex(network, info->ifi_index);
515 pb_log("network: interface %s removed\n", interface->name);
516 remove_interface(network, interface);
520 /* ignore the default tun device in some environments */
521 if (strncmp(ifname, "tun", strlen("tun")) == 0)
524 interface = find_interface_by_ifindex(network, info->ifi_index);
526 interface = talloc_zero(network, struct interface);
527 interface->ifindex = info->ifi_index;
528 interface->state = IFSTATE_NEW;
529 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
530 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
531 add_interface(network, interface);
534 /* A repeated RTM_NEWLINK can represent an interface name change */
535 if (strncmp(interface->name, ifname, IFNAMSIZ)) {
536 pb_debug("ifname update: %s -> %s\n", interface->name, ifname);
537 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
538 talloc_free(interface->dev->device->id);
539 interface->dev->device->id =
540 talloc_strdup(interface->dev->device, ifname);
543 /* notify the sysinfo code about changes to this interface */
544 if (strcmp(interface->name, "lo"))
545 system_info_register_interface(
546 sizeof(interface->hwaddr),
547 interface->hwaddr, interface->name,
548 info->ifi_flags & IFF_LOWER_UP);
550 configure_interface(network, interface,
551 info->ifi_flags & IFF_UP,
552 info->ifi_flags & IFF_LOWER_UP);
557 static int network_netlink_process(void *arg)
559 struct network *network = arg;
560 struct nlmsghdr *nlmsg;
566 memset(&msg, 0, sizeof(msg));
573 iov.iov_len = network->netlink_buf_size;
574 iov.iov_base = network->netlink_buf;
576 rc = recvmsg(network->netlink_sd, &msg, flags);
579 perror("netlink recv header");
585 /* if the netlink message was larger than our buffer, realloc
586 * before reading again */
587 if (len > network->netlink_buf_size || msg.msg_flags & MSG_TRUNC) {
588 network->netlink_buf_size *= 2;
589 network->netlink_buf = talloc_realloc(network,
590 network->netlink_buf,
592 network->netlink_buf_size);
596 /* otherwise, we're good to read the entire message without PEEK */
597 if (flags == MSG_PEEK) {
602 for_each_nlmsg(network->netlink_buf, nlmsg, len)
603 network_handle_nlmsg(network, nlmsg);
608 static void network_init_dns(struct network *network)
610 const struct config *config;
616 if (network->dry_run)
619 config = config_get();
620 if (!config || !config->network.n_dns_servers)
623 rc = read_file(network, "/etc/resolv.conf", &buf, &len);
626 buf = talloc_strdup(network, "");
632 for (i = 0; i < config->network.n_dns_servers; i++) {
636 dns_conf = talloc_asprintf(network, "nameserver %s\n",
637 config->network.dns_servers[i]);
639 if (strstr(buf, dns_conf)) {
640 talloc_free(dns_conf);
644 dns_conf_len = strlen(dns_conf);
645 buf = talloc_realloc(network, buf, char, len + dns_conf_len + 1);
646 memcpy(buf + len, dns_conf, dns_conf_len);
651 talloc_free(dns_conf);
655 rc = replace_file("/etc/resolv.conf", buf, len);
657 pb_log("error replacing resolv.conf: %s\n",
664 struct network *network_init(struct device_handler *handler,
665 struct waitset *waitset, bool dry_run)
667 struct network *network;
670 network = talloc(handler, struct network);
671 list_init(&network->interfaces);
672 network->handler = handler;
673 network->dry_run = dry_run;
674 network->manual_config = config_get()->network.n_interfaces != 0;
676 network_init_dns(network);
678 rc = network_init_netlink(network);
682 network->waiter = waiter_register_io(waitset, network->netlink_sd,
683 WAIT_IN, network_netlink_process, network);
685 if (!network->waiter)
688 rc = network_send_link_query(network);
695 network_shutdown(network);
699 int network_shutdown(struct network *network)
701 struct interface *interface;
704 waiter_remove(network->waiter);
706 list_for_each_entry(&network->interfaces, interface, list) {
707 if (interface->state == IFSTATE_IGNORED)
709 if (!strcmp(interface->name, "lo"))
711 interface_down(interface);
714 close(network->netlink_sd);
715 talloc_free(network);