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"
28 #define PIDFILE_BASE (LOCAL_STATE_DIR "/petitboot/")
29 #define INITIAL_BUFSIZE 4096
31 #define for_each_nlmsg(buf, nlmsg, len) \
32 for (nlmsg = (struct nlmsghdr *)buf; \
33 NLMSG_OK(nlmsg, len) && nlmsg->nlmsg_type != NLMSG_DONE; \
34 nlmsg = NLMSG_NEXT(nlmsg, len))
36 #define for_each_rta(buf, rta, attrlen) \
37 for (rta = (struct rtattr *)(buf); RTA_OK(rta, attrlen); \
38 rta = RTA_NEXT(rta, attrlen))
44 uint8_t hwaddr[HWADDR_SIZE];
48 IFSTATE_UP_WAITING_LINK,
53 struct list_item list;
54 struct process *udhcpc_process;
55 struct discover_device *dev;
59 struct list interfaces;
60 struct device_handler *handler;
61 struct waiter *waiter;
64 unsigned int netlink_buf_size;
69 static char *mac_bytes_to_string(void *ctx, uint8_t *addr, int len)
71 const int l = strlen("xx:");
76 return talloc_strdup(ctx, "");
78 buf = talloc_array(ctx, char, (len * l) + 1);
80 for (i = 0; i < len; i++)
81 sprintf(buf + (l * i), "%02x:", addr[i]);
83 *(buf + (l * len) - 1) = '\0';
88 static const struct interface_config *find_config_by_hwaddr(
91 const struct config *config;
94 config = config_get();
98 for (i = 0; i < config->network.n_interfaces; i++) {
99 struct interface_config *ifconf = config->network.interfaces[i];
101 if (!memcmp(ifconf->hwaddr, hwaddr, HWADDR_SIZE))
108 static struct interface *find_interface_by_ifindex(struct network *network,
111 struct interface *interface;
113 list_for_each_entry(&network->interfaces, interface, list)
114 if (interface->ifindex == ifindex)
120 static struct interface *find_interface_by_name(struct network *network,
123 struct interface *interface;
125 list_for_each_entry(&network->interfaces, interface, list)
126 if (!strcmp(interface->name, name))
132 static struct interface *find_interface_by_uuid(struct network *network,
135 struct interface *interface;
138 list_for_each_entry(&network->interfaces, interface, list) {
139 mac = mac_bytes_to_string(interface, interface->hwaddr,
140 sizeof(interface->hwaddr));
141 if (!strcmp(mac, uuid)) {
151 uint8_t *find_mac_by_name(void *ctx, struct network *network,
154 struct interface *interface;
156 interface = find_interface_by_name(network, name);
160 return talloc_memdup(ctx, &interface->hwaddr,
161 sizeof(uint8_t) * HWADDR_SIZE);
164 static int network_init_netlink(struct network *network)
166 struct sockaddr_nl addr;
169 memset(&addr, 0, sizeof(addr));
170 addr.nl_family = AF_NETLINK;
171 addr.nl_groups = RTMGRP_LINK;
173 network->netlink_sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
174 if (network->netlink_sd < 0) {
175 perror("socket(AF_NETLINK)");
179 rc = bind(network->netlink_sd, (struct sockaddr *)&addr, sizeof(addr));
181 perror("bind(sockaddr_nl)");
182 close(network->netlink_sd);
186 network->netlink_buf_size = INITIAL_BUFSIZE;
187 network->netlink_buf = talloc_array(network, char,
188 network->netlink_buf_size);
193 static int network_send_link_query(struct network *network)
197 struct nlmsghdr nlmsg;
198 struct rtgenmsg rtmsg;
201 memset(&msg, 0, sizeof(msg));
203 msg.nlmsg.nlmsg_len = sizeof(msg);
204 msg.nlmsg.nlmsg_type = RTM_GETLINK;
205 msg.nlmsg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
206 msg.nlmsg.nlmsg_seq = 0;
207 msg.nlmsg.nlmsg_pid = 0;
208 msg.rtmsg.rtgen_family = AF_UNSPEC;
210 rc = send(network->netlink_sd, &msg, sizeof(msg), MSG_NOSIGNAL);
211 if (rc != sizeof(msg))
217 static void add_interface(struct network *network,
218 struct interface *interface)
220 char *uuid = mac_bytes_to_string(interface, interface->hwaddr,
221 sizeof(interface->hwaddr));
223 list_add(&network->interfaces, &interface->list);
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;
245 iface = find_interface_by_uuid(network, dev->uuid);
250 dev->uuid = mac_bytes_to_string(iface->dev, iface->hwaddr,
251 sizeof(iface->hwaddr));
254 void network_unregister_device(struct network *network,
255 struct discover_device *dev)
257 struct interface *iface;
259 iface = find_interface_by_uuid(network, dev->uuid);
266 static int interface_change(struct interface *interface, bool up)
268 const char *statestr = up ? "up" : "down";
271 if (!up && interface->udhcpc_process) {
272 /* we don't care about the callback from here */
273 interface->udhcpc_process->exit_cb = NULL;
274 interface->udhcpc_process->data = NULL;
275 process_stop_async(interface->udhcpc_process);
276 process_release(interface->udhcpc_process);
280 rc = process_run_simple(interface, pb_system_apps.ip,
281 "address", "flush", "dev", interface->name,
284 pb_log("failed to flush addresses from interface %s\n",
288 rc = process_run_simple(interface, pb_system_apps.ip,
289 "link", "set", interface->name, statestr, NULL);
291 pb_log("failed to bring interface %s %s\n", interface->name,
298 static int interface_up(struct interface *interface)
300 return interface_change(interface, true);
303 static int interface_down(struct interface *interface)
305 return interface_change(interface, false);
308 static void udhcpc_process_exit(struct process *process)
310 struct interface *interface = process->data;
311 pb_debug("udhcp client [pid %d] for interface %s exited, rc %d\n",
312 process->pid, interface->name, process->exit_status);
313 interface->udhcpc_process = NULL;
314 process_release(process);
317 static void configure_interface_dhcp(struct network *network,
318 struct interface *interface)
320 const struct platform *platform;
321 char pidfile[256], id[10];
322 struct process *process;
324 const char *argv[] = {
325 pb_system_apps.udhcpc,
329 "-O", "pxepathprefix",
331 "-i", interface->name,
332 "-x", id, /* [11,12] - dhcp client identifier */
336 device_handler_status_dev_info(network->handler, interface->dev,
337 _("Configuring with DHCP"));
339 snprintf(pidfile, sizeof(pidfile), "%s/udhcpc-%s.pid",
340 PIDFILE_BASE, interface->name);
342 platform = platform_get();
343 if (platform && platform->dhcp_arch_id != 0xffff)
344 snprintf(id, sizeof(id), "0x5d:%04x", platform->dhcp_arch_id);
348 process = process_create(interface);
350 process->path = pb_system_apps.udhcpc;
351 process->argv = argv;
352 process->exit_cb = udhcpc_process_exit;
353 process->data = interface;
355 rc = process_run_async(process);
358 process_release(process);
360 interface->udhcpc_process = process;
365 static void configure_interface_static(struct network *network,
366 struct interface *interface,
367 const struct interface_config *config)
371 device_handler_status_dev_info(network->handler, interface->dev,
372 _("Configuring with static address (ip: %s)"),
373 config->static_config.address);
375 rc = process_run_simple(interface, pb_system_apps.ip,
376 "address", "add", config->static_config.address,
377 "dev", interface->name, NULL);
381 pb_log("failed to add address %s to interface %s\n",
382 config->static_config.address,
387 /* we need the interface up before we can route through it */
388 rc = interface_up(interface);
392 if (config->static_config.gateway)
393 rc = process_run_simple(interface, pb_system_apps.ip,
394 "route", "add", "default",
395 "via", config->static_config.gateway,
399 pb_log("failed to add default route %s on interface %s\n",
400 config->static_config.gateway,
404 if (config->static_config.url) {
405 pb_log("config URL %s\n", config->static_config.url);
406 device_handler_process_url(network->handler,
407 config->static_config.url,
408 mac_bytes_to_string(interface->dev,
410 sizeof(interface->hwaddr)),
411 config->static_config.address);
417 static void configure_interface(struct network *network,
418 struct interface *interface, bool up, bool link)
420 const struct interface_config *config = NULL;
422 if (interface->state == IFSTATE_IGNORED)
425 /* old interface? check that we're still up and running */
426 if (interface->state == IFSTATE_CONFIGURED) {
428 interface->state = IFSTATE_NEW;
430 interface->state = IFSTATE_UP_WAITING_LINK;
432 pb_debug("network: skipping configured interface %s\n",
438 /* always up the lookback, no other handling required */
439 if (!strcmp(interface->name, "lo")) {
440 if (interface->state == IFSTATE_NEW)
441 interface_up(interface);
442 interface->state = IFSTATE_CONFIGURED;
446 config = find_config_by_hwaddr(interface->hwaddr);
447 if (config && config->ignore) {
448 pb_log("network: ignoring interface %s\n", interface->name);
449 interface->state = IFSTATE_IGNORED;
453 /* if we're in manual config mode, we need an interface configuration */
454 if (network->manual_config && !config) {
455 interface->state = IFSTATE_IGNORED;
456 pb_log("network: skipping %s: manual config mode, "
457 "but no config for this interface\n",
462 /* new interface? bring up to the point so we can detect a link */
463 if (interface->state == IFSTATE_NEW) {
465 interface_up(interface);
466 pb_log("network: bringing up interface %s\n",
471 interface->state = IFSTATE_UP_WAITING_LINK;
475 /* no link? wait for a notification */
476 if (interface->state == IFSTATE_UP_WAITING_LINK && !link)
479 pb_log("network: configuring interface %s\n", interface->name);
481 if (!config || config->method == CONFIG_METHOD_DHCP) {
482 configure_interface_dhcp(network, interface);
484 } else if (config->method == CONFIG_METHOD_STATIC) {
485 configure_interface_static(network, interface, config);
488 interface->state = IFSTATE_CONFIGURED;
491 static int network_handle_nlmsg(struct network *network, struct nlmsghdr *nlmsg)
493 bool have_ifaddr, have_ifname;
494 struct interface *interface;
495 struct ifinfomsg *info;
499 char ifname[IFNAMSIZ+1];
503 /* we're only interested in NEWLINK messages */
504 type = nlmsg->nlmsg_type;
505 if (!(type == RTM_NEWLINK || type == RTM_DELLINK))
508 info = NLMSG_DATA(nlmsg);
510 have_ifaddr = have_ifname = false;
513 attrlen = nlmsg->nlmsg_len - sizeof(*info);
515 /* extract the interface name and hardware address attributes */
516 for_each_rta(info + 1, attr, attrlen) {
517 void *data = RTA_DATA(attr);
519 switch (attr->rta_type) {
521 memcpy(ifaddr, data, sizeof(ifaddr));
526 strncpy(ifname, data, IFNAMSIZ);
531 mtu = *(unsigned int *)data;
536 if (!have_ifaddr || !have_ifname)
539 if (type == RTM_DELLINK || mtu == 0) {
540 interface = find_interface_by_ifindex(network, info->ifi_index);
543 pb_log("network: interface %s removed\n", interface->name);
544 remove_interface(network, interface);
548 /* ignore the default tun device in some environments */
549 if (strncmp(ifname, "tun", strlen("tun")) == 0)
552 interface = find_interface_by_ifindex(network, info->ifi_index);
554 interface = talloc_zero(network, struct interface);
555 interface->ifindex = info->ifi_index;
556 interface->state = IFSTATE_NEW;
557 memcpy(interface->hwaddr, ifaddr, sizeof(interface->hwaddr));
558 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
559 add_interface(network, interface);
562 /* A repeated RTM_NEWLINK can represent an interface name change */
563 if (strncmp(interface->name, ifname, IFNAMSIZ)) {
564 pb_debug("ifname update: %s -> %s\n", interface->name, ifname);
565 strncpy(interface->name, ifname, sizeof(interface->name) - 1);
566 talloc_free(interface->dev->device->id);
567 interface->dev->device->id =
568 talloc_strdup(interface->dev->device, ifname);
571 /* notify the sysinfo code about changes to this interface */
572 if (strcmp(interface->name, "lo"))
573 system_info_register_interface(
574 sizeof(interface->hwaddr),
575 interface->hwaddr, interface->name,
576 info->ifi_flags & IFF_LOWER_UP);
578 configure_interface(network, interface,
579 info->ifi_flags & IFF_UP,
580 info->ifi_flags & IFF_LOWER_UP);
585 static int network_netlink_process(void *arg)
587 struct network *network = arg;
588 struct nlmsghdr *nlmsg;
594 memset(&msg, 0, sizeof(msg));
601 iov.iov_len = network->netlink_buf_size;
602 iov.iov_base = network->netlink_buf;
604 rc = recvmsg(network->netlink_sd, &msg, flags);
607 perror("netlink recv header");
613 /* if the netlink message was larger than our buffer, realloc
614 * before reading again */
615 if (len > network->netlink_buf_size || msg.msg_flags & MSG_TRUNC) {
616 network->netlink_buf_size *= 2;
617 network->netlink_buf = talloc_realloc(network,
618 network->netlink_buf,
620 network->netlink_buf_size);
624 /* otherwise, we're good to read the entire message without PEEK */
625 if (flags == MSG_PEEK) {
630 for_each_nlmsg(network->netlink_buf, nlmsg, len)
631 network_handle_nlmsg(network, nlmsg);
636 static void network_init_dns(struct network *network)
638 const struct config *config;
644 if (network->dry_run)
647 config = config_get();
648 if (!config || !config->network.n_dns_servers)
651 rc = read_file(network, "/etc/resolv.conf", &buf, &len);
654 buf = talloc_strdup(network, "");
660 for (i = 0; i < config->network.n_dns_servers; i++) {
664 dns_conf = talloc_asprintf(network, "nameserver %s\n",
665 config->network.dns_servers[i]);
667 if (strstr(buf, dns_conf)) {
668 talloc_free(dns_conf);
672 dns_conf_len = strlen(dns_conf);
673 buf = talloc_realloc(network, buf, char, len + dns_conf_len + 1);
674 memcpy(buf + len, dns_conf, dns_conf_len);
679 talloc_free(dns_conf);
683 rc = replace_file("/etc/resolv.conf", buf, len);
685 pb_log("error replacing resolv.conf: %s\n",
692 struct network *network_init(struct device_handler *handler,
693 struct waitset *waitset, bool dry_run)
695 struct network *network;
698 network = talloc(handler, struct network);
699 list_init(&network->interfaces);
700 network->handler = handler;
701 network->dry_run = dry_run;
702 network->manual_config = config_get()->network.n_interfaces != 0;
704 network_init_dns(network);
706 rc = network_init_netlink(network);
710 network->waiter = waiter_register_io(waitset, network->netlink_sd,
711 WAIT_IN, network_netlink_process, network);
713 if (!network->waiter)
716 rc = network_send_link_query(network);
723 network_shutdown(network);
727 int network_shutdown(struct network *network)
729 struct interface *interface;
732 waiter_remove(network->waiter);
734 list_for_each_entry(&network->interfaces, interface, list) {
735 if (interface->state == IFSTATE_IGNORED)
737 if (!strcmp(interface->name, "lo"))
739 interface_down(interface);
742 close(network->netlink_sd);
743 talloc_free(network);