/* * netifd - network interface daemon * Copyright (C) 2012 Felix Fietkau * Copyright (C) 2013 Jo-Philipp Wich * Copyright (C) 2013 Steven Barth * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef RTN_FAILED_POLICY #define RTN_FAILED_POLICY 12 #endif #include #include #include #include #include #include #include #include #include "netifd.h" #include "device.h" #include "system.h" struct event_socket { struct uloop_fd uloop; struct nl_sock *sock; int bufsize; }; static int sock_ioctl = -1; static struct nl_sock *sock_rtnl = NULL; static int cb_rtnl_event(struct nl_msg *msg, void *arg); static void handle_hotplug_event(struct uloop_fd *u, unsigned int events); static char dev_buf[256]; static void handler_nl_event(struct uloop_fd *u, unsigned int events) { struct event_socket *ev = container_of(u, struct event_socket, uloop); int err; socklen_t errlen = sizeof(err); if (!u->error) { nl_recvmsgs_default(ev->sock); return; } if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen)) goto abort; switch(err) { case ENOBUFS: // Increase rx buffer size on netlink socket ev->bufsize *= 2; if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0)) goto abort; // Request full dump since some info got dropped struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC }; nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg)); break; default: goto abort; } u->error = false; return; abort: uloop_fd_delete(&ev->uloop); return; } static struct nl_sock * create_socket(int protocol, int groups) { struct nl_sock *sock; sock = nl_socket_alloc(); if (!sock) return NULL; if (groups) nl_join_groups(sock, groups); if (nl_connect(sock, protocol)) return NULL; return sock; } static bool create_raw_event_socket(struct event_socket *ev, int protocol, int groups, uloop_fd_handler cb, int flags) { ev->sock = create_socket(protocol, groups); if (!ev->sock) return false; ev->uloop.fd = nl_socket_get_fd(ev->sock); ev->uloop.cb = cb; if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags)) return false; return true; } static bool create_event_socket(struct event_socket *ev, int protocol, int (*cb)(struct nl_msg *msg, void *arg)) { if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB)) return false; // Install the valid custom callback handler nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL); // Disable sequence number checking on event sockets nl_socket_disable_seq_check(ev->sock); // Increase rx buffer size to 65K on event sockets ev->bufsize = 65535; if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0)) return false; return true; } int system_init(void) { static struct event_socket rtnl_event; static struct event_socket hotplug_event; sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0); system_fd_set_cloexec(sock_ioctl); // Prepare socket for routing / address control sock_rtnl = create_socket(NETLINK_ROUTE, 0); if (!sock_rtnl) return -1; if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event)) return -1; if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1, handle_hotplug_event, 0)) return -1; // Receive network link events form kernel nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK); return 0; } static void system_set_sysctl(const char *path, const char *val) { int fd; fd = open(path, O_WRONLY); if (fd < 0) return; if (write(fd, val, strlen(val))) {} close(fd); } static void system_set_dev_sysctl(const char *path, const char *device, const char *val) { snprintf(dev_buf, sizeof(dev_buf), path, device); system_set_sysctl(dev_buf, val); } static void system_set_disable_ipv6(struct device *dev, const char *val) { system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val); } #ifndef IFF_LOWER_UP #define IFF_LOWER_UP 0x10000 #endif // Evaluate netlink messages static int cb_rtnl_event(struct nl_msg *msg, void *arg) { struct nlmsghdr *nh = nlmsg_hdr(msg); struct ifinfomsg *ifi = NLMSG_DATA(nh); struct nlattr *nla[__IFLA_MAX]; if (nh->nlmsg_type != RTM_NEWLINK) goto out; nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL); if (!nla[IFLA_IFNAME]) goto out; struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false); if (!dev) goto out; device_set_ifindex(dev, ifi->ifi_index); device_set_link(dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false); out: return 0; } static void handle_hotplug_msg(char *data, int size) { const char *subsystem = NULL, *interface = NULL; char *cur, *end, *sep; struct device *dev; int skip; bool add; if (!strncmp(data, "add@", 4)) add = true; else if (!strncmp(data, "remove@", 7)) add = false; else return; skip = strlen(data) + 1; end = data + size; for (cur = data + skip; cur < end; cur += skip) { skip = strlen(cur) + 1; sep = strchr(cur, '='); if (!sep) continue; *sep = 0; if (!strcmp(cur, "INTERFACE")) interface = sep + 1; else if (!strcmp(cur, "SUBSYSTEM")) { subsystem = sep + 1; if (strcmp(subsystem, "net") != 0) return; } if (subsystem && interface) goto found; } return; found: dev = device_get(interface, false); if (!dev) return; if (dev->type != &simple_device_type) return; if (add && system_if_force_external(dev->ifname)) return; device_set_present(dev, add); } static void handle_hotplug_event(struct uloop_fd *u, unsigned int events) { struct event_socket *ev = container_of(u, struct event_socket, uloop); struct sockaddr_nl nla; unsigned char *buf = NULL; int size; while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) { if (nla.nl_pid == 0) handle_hotplug_msg((char *) buf, size); free(buf); } } static int system_rtnl_call(struct nl_msg *msg) { int ret; ret = nl_send_auto_complete(sock_rtnl, msg); nlmsg_free(msg); if (ret < 0) return ret; return nl_wait_for_ack(sock_rtnl); } int system_bridge_delbr(struct device *bridge) { return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname); } static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); if (dev) ifr.ifr_ifindex = dev->ifindex; else ifr.ifr_data = data; strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name)); return ioctl(sock_ioctl, cmd, &ifr); } static bool system_is_bridge(const char *name, char *buf, int buflen) { struct stat st; snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name); if (stat(buf, &st) < 0) return false; return true; } static char *system_get_bridge(const char *name, char *buf, int buflen) { char *path; ssize_t len; glob_t gl; snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name); if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0) return NULL; if (gl.gl_pathc == 0) return NULL; len = readlink(gl.gl_pathv[0], buf, buflen); if (len < 0) return NULL; buf[len] = 0; path = strrchr(buf, '/'); if (!path) return NULL; return path + 1; } int system_bridge_addif(struct device *bridge, struct device *dev) { char *oldbr; system_set_disable_ipv6(dev, "1"); oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf)); if (oldbr && !strcmp(oldbr, bridge->ifname)) return 0; return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL); } int system_bridge_delif(struct device *bridge, struct device *dev) { system_set_disable_ipv6(dev, "0"); return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL); } static int system_if_resolve(struct device *dev) { struct ifreq ifr; strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name)); if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr)) return ifr.ifr_ifindex; else return 0; } static int system_if_flags(const char *ifname, unsigned add, unsigned rem) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr); ifr.ifr_flags |= add; ifr.ifr_flags &= ~rem; return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr); } struct clear_data { struct nl_msg *msg; struct device *dev; int type; int size; int af; }; static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex) { struct ifaddrmsg *ifa = NLMSG_DATA(hdr); return ifa->ifa_index == ifindex; } static bool check_route(struct nlmsghdr *hdr, int ifindex) { struct rtmsg *r = NLMSG_DATA(hdr); struct nlattr *tb[__RTA_MAX]; if (r->rtm_protocol == RTPROT_KERNEL && r->rtm_family == AF_INET6) return false; nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL); if (!tb[RTA_OIF]) return false; return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex; } static bool check_rule(struct nlmsghdr *hdr, int ifindex) { return true; } static int cb_clear_event(struct nl_msg *msg, void *arg) { struct clear_data *clr = arg; struct nlmsghdr *hdr = nlmsg_hdr(msg); bool (*cb)(struct nlmsghdr *, int ifindex); int type; switch(clr->type) { case RTM_GETADDR: type = RTM_DELADDR; if (hdr->nlmsg_type != RTM_NEWADDR) return NL_SKIP; cb = check_ifaddr; break; case RTM_GETROUTE: type = RTM_DELROUTE; if (hdr->nlmsg_type != RTM_NEWROUTE) return NL_SKIP; cb = check_route; break; case RTM_GETRULE: type = RTM_DELRULE; if (hdr->nlmsg_type != RTM_NEWRULE) return NL_SKIP; cb = check_rule; break; default: return NL_SKIP; } if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0)) return NL_SKIP; if (type == RTM_DELRULE) D(SYSTEM, "Remove a rule\n"); else D(SYSTEM, "Remove %s from device %s\n", type == RTM_DELADDR ? "an address" : "a route", clr->dev->ifname); memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len); hdr = nlmsg_hdr(clr->msg); hdr->nlmsg_type = type; hdr->nlmsg_flags = NLM_F_REQUEST; nl_socket_disable_auto_ack(sock_rtnl); nl_send_auto_complete(sock_rtnl, clr->msg); nl_socket_enable_auto_ack(sock_rtnl); return NL_SKIP; } static int cb_finish_event(struct nl_msg *msg, void *arg) { int *pending = arg; *pending = 0; return NL_STOP; } static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg) { int *pending = arg; *pending = err->error; return NL_STOP; } static void system_if_clear_entries(struct device *dev, int type, int af) { struct clear_data clr; struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT); struct rtmsg rtm = { .rtm_family = af, .rtm_flags = RTM_F_CLONED, }; int flags = NLM_F_DUMP; int pending = 1; clr.af = af; clr.dev = dev; clr.type = type; switch (type) { case RTM_GETADDR: case RTM_GETRULE: clr.size = sizeof(struct rtgenmsg); break; case RTM_GETROUTE: clr.size = sizeof(struct rtmsg); break; default: return; } if (!cb) return; clr.msg = nlmsg_alloc_simple(type, flags); if (!clr.msg) goto out; nlmsg_append(clr.msg, &rtm, clr.size, 0); nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr); nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending); nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending); nl_send_auto_complete(sock_rtnl, clr.msg); while (pending > 0) nl_recvmsgs(sock_rtnl, cb); nlmsg_free(clr.msg); out: nl_cb_put(cb); } /* * Clear bridge (membership) state and bring down device */ void system_if_clear_state(struct device *dev) { static char buf[256]; char *bridge; if (dev->external) return; device_set_ifindex(dev, system_if_resolve(dev)); if (!dev->ifindex) return; system_if_flags(dev->ifname, 0, IFF_UP); if (system_is_bridge(dev->ifname, buf, sizeof(buf))) { D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname); system_bridge_delbr(dev); return; } bridge = system_get_bridge(dev->ifname, buf, sizeof(buf)); if (bridge) { D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge); system_bridge_if(bridge, dev, SIOCBRDELIF, NULL); } system_if_clear_entries(dev, RTM_GETROUTE, AF_INET); system_if_clear_entries(dev, RTM_GETADDR, AF_INET); system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6); system_if_clear_entries(dev, RTM_GETADDR, AF_INET6); system_set_disable_ipv6(dev, "0"); } static inline unsigned long sec_to_jiffies(int val) { return (unsigned long) val * 100; } int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg) { unsigned long args[4] = {}; if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0) return -1; args[0] = BRCTL_SET_BRIDGE_STP_STATE; args[1] = !!cfg->stp; system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args); args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY; args[1] = sec_to_jiffies(cfg->forward_delay); system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args); system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping", bridge->ifname, cfg->igmp_snoop ? "1" : "0"); args[0] = BRCTL_SET_BRIDGE_PRIORITY; args[1] = cfg->priority; system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args); if (cfg->flags & BRIDGE_OPT_AGEING_TIME) { args[0] = BRCTL_SET_AGEING_TIME; args[1] = sec_to_jiffies(cfg->ageing_time); system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args); } if (cfg->flags & BRIDGE_OPT_HELLO_TIME) { args[0] = BRCTL_SET_BRIDGE_HELLO_TIME; args[1] = sec_to_jiffies(cfg->hello_time); system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args); } if (cfg->flags & BRIDGE_OPT_MAX_AGE) { args[0] = BRCTL_SET_BRIDGE_MAX_AGE; args[1] = sec_to_jiffies(cfg->max_age); system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args); } return 0; } int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg) { struct nl_msg *msg; struct nlattr *linkinfo, *data; struct ifinfomsg iim = { .ifi_family = AF_INET }; int ifindex = system_if_resolve(dev); int i, rv; static const struct { const char *name; enum macvlan_mode val; } modes[] = { { "private", MACVLAN_MODE_PRIVATE }, { "vepa", MACVLAN_MODE_VEPA }, { "bridge", MACVLAN_MODE_BRIDGE }, { "passthru", MACVLAN_MODE_PASSTHRU }, }; if (ifindex == 0) return -ENOENT; msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL); if (!msg) return -1; nlmsg_append(msg, &iim, sizeof(iim), 0); if (cfg->flags & MACVLAN_OPT_MACADDR) nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr); nla_put(msg, IFLA_IFNAME, IFNAMSIZ, macvlan->ifname); nla_put_u32(msg, IFLA_LINK, ifindex); if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO))) goto nla_put_failure; nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan"); if (!(data = nla_nest_start(msg, IFLA_INFO_DATA))) goto nla_put_failure; if (cfg->mode) { for (i = 0; i < ARRAY_SIZE(modes); i++) { if (strcmp(cfg->mode, modes[i].name) != 0) continue; nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val); break; } } nla_nest_end(msg, data); nla_nest_end(msg, linkinfo); rv = system_rtnl_call(msg); if (rv) D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv); return rv; nla_put_failure: nlmsg_free(msg); return -ENOMEM; } int system_macvlan_del(struct device *macvlan) { struct nl_msg *msg; struct ifinfomsg iim; iim.ifi_family = AF_INET; iim.ifi_index = 0; msg = nlmsg_alloc_simple(RTM_DELLINK, 0); if (!msg) return -1; nlmsg_append(msg, &iim, sizeof(iim), 0); nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan"); nla_put(msg, IFLA_IFNAME, sizeof(macvlan->ifname), macvlan->ifname); system_rtnl_call(msg); return 0; } static int system_vlan(struct device *dev, int id) { struct vlan_ioctl_args ifr = { .cmd = SET_VLAN_NAME_TYPE_CMD, .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, }; ioctl(sock_ioctl, SIOCSIFVLAN, &ifr); if (id < 0) { ifr.cmd = DEL_VLAN_CMD; ifr.u.VID = 0; } else { ifr.cmd = ADD_VLAN_CMD; ifr.u.VID = id; } strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1)); return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr); } int system_vlan_add(struct device *dev, int id) { return system_vlan(dev, id); } int system_vlan_del(struct device *dev) { return system_vlan(dev, -1); } static void system_if_get_settings(struct device *dev, struct device_settings *s) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name)); if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) { s->mtu = ifr.ifr_mtu; s->flags |= DEV_OPT_MTU; } if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) { s->txqueuelen = ifr.ifr_qlen; s->flags |= DEV_OPT_TXQUEUELEN; } if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) { memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr)); s->flags |= DEV_OPT_MACADDR; } } void system_if_apply_settings(struct device *dev, struct device_settings *s) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name)); if (s->flags & DEV_OPT_MTU) { ifr.ifr_mtu = s->mtu; if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0) s->flags &= ~DEV_OPT_MTU; } if (s->flags & DEV_OPT_TXQUEUELEN) { ifr.ifr_qlen = s->txqueuelen; if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0) s->flags &= ~DEV_OPT_TXQUEUELEN; } if ((s->flags & DEV_OPT_MACADDR) && !dev->external) { ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER; memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr)); if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0) s->flags &= ~DEV_OPT_MACADDR; } } int system_if_up(struct device *dev) { system_if_get_settings(dev, &dev->orig_settings); system_if_apply_settings(dev, &dev->settings); device_set_ifindex(dev, system_if_resolve(dev)); return system_if_flags(dev->ifname, IFF_UP, 0); } int system_if_down(struct device *dev) { int ret = system_if_flags(dev->ifname, 0, IFF_UP); dev->orig_settings.flags &= dev->settings.flags; system_if_apply_settings(dev, &dev->orig_settings); return ret; } struct if_check_data { struct device *dev; int pending; int ret; }; static int cb_if_check_valid(struct nl_msg *msg, void *arg) { struct nlmsghdr *nh = nlmsg_hdr(msg); struct ifinfomsg *ifi = NLMSG_DATA(nh); struct if_check_data *chk = (struct if_check_data *)arg; if (nh->nlmsg_type != RTM_NEWLINK) return NL_SKIP; device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false); device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false); return NL_OK; } static int cb_if_check_ack(struct nl_msg *msg, void *arg) { struct if_check_data *chk = (struct if_check_data *)arg; chk->pending = 0; return NL_STOP; } static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg) { struct if_check_data *chk = (struct if_check_data *)arg; device_set_present(chk->dev, false); device_set_link(chk->dev, false); chk->pending = err->error; return NL_STOP; } int system_if_check(struct device *dev) { struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT); struct nl_msg *msg; struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, .ifi_index = 0, }; struct if_check_data chk = { .dev = dev, .pending = 1, }; int ret = 1; msg = nlmsg_alloc_simple(RTM_GETLINK, 0); if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) || nla_put_string(msg, IFLA_IFNAME, dev->ifname)) goto out; nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk); nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk); nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk); nl_send_auto_complete(sock_rtnl, msg); while (chk.pending > 0) nl_recvmsgs(sock_rtnl, cb); nlmsg_free(msg); ret = chk.pending; out: nl_cb_put(cb); return ret; } struct device * system_if_get_parent(struct device *dev) { char buf[64], *devname; int ifindex, iflink, len; FILE *f; snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname); f = fopen(buf, "r"); if (!f) return NULL; len = fread(buf, 1, sizeof(buf) - 1, f); fclose(f); if (len <= 0) return NULL; buf[len] = 0; iflink = strtoul(buf, NULL, 0); ifindex = system_if_resolve(dev); if (!iflink || iflink == ifindex) return NULL; devname = if_indextoname(iflink, buf); if (!devname) return NULL; return device_get(devname, true); } static bool read_string_file(int dir_fd, const char *file, char *buf, int len) { bool ret = false; char *c; int fd; fd = openat(dir_fd, file, O_RDONLY); if (fd < 0) return false; retry: len = read(fd, buf, len - 1); if (len < 0) { if (errno == EINTR) goto retry; } else if (len > 0) { buf[len] = 0; c = strchr(buf, '\n'); if (c) *c = 0; ret = true; } close(fd); return ret; } static bool read_uint64_file(int dir_fd, const char *file, uint64_t *val) { char buf[64]; bool ret = false; ret = read_string_file(dir_fd, file, buf, sizeof(buf)); if (ret) *val = strtoull(buf, NULL, 0); return ret; } /* Assume advertised flags == supported flags */ static const struct { uint32_t mask; const char *name; } ethtool_link_modes[] = { { ADVERTISED_10baseT_Half, "10H" }, { ADVERTISED_10baseT_Full, "10F" }, { ADVERTISED_100baseT_Half, "100H" }, { ADVERTISED_100baseT_Full, "100F" }, { ADVERTISED_1000baseT_Half, "1000H" }, { ADVERTISED_1000baseT_Full, "1000F" }, }; static void system_add_link_modes(struct blob_buf *b, __u32 mask) { int i; for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) { if (mask & ethtool_link_modes[i].mask) blobmsg_add_string(b, NULL, ethtool_link_modes[i].name); } } bool system_if_force_external(const char *ifname) { char buf[64]; struct stat s; snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname); return stat(buf, &s) == 0; } int system_if_dump_info(struct device *dev, struct blob_buf *b) { struct ethtool_cmd ecmd; struct ifreq ifr; char buf[64], *s; void *c; int dir_fd; snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname); dir_fd = open(buf, O_DIRECTORY); memset(&ecmd, 0, sizeof(ecmd)); memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, dev->ifname); ifr.ifr_data = (caddr_t) &ecmd; ecmd.cmd = ETHTOOL_GSET; if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) { c = blobmsg_open_array(b, "link-advertising"); system_add_link_modes(b, ecmd.advertising); blobmsg_close_array(b, c); c = blobmsg_open_array(b, "link-supported"); system_add_link_modes(b, ecmd.supported); blobmsg_close_array(b, c); s = blobmsg_alloc_string_buffer(b, "speed", 8); snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd), ecmd.duplex == DUPLEX_HALF ? 'H' : 'F'); blobmsg_add_string_buffer(b); } close(dir_fd); return 0; } int system_if_dump_stats(struct device *dev, struct blob_buf *b) { const char *const counters[] = { "collisions", "rx_frame_errors", "tx_compressed", "multicast", "rx_length_errors", "tx_dropped", "rx_bytes", "rx_missed_errors", "tx_errors", "rx_compressed", "rx_over_errors", "tx_fifo_errors", "rx_crc_errors", "rx_packets", "tx_heartbeat_errors", "rx_dropped", "tx_aborted_errors", "tx_packets", "rx_errors", "tx_bytes", "tx_window_errors", "rx_fifo_errors", "tx_carrier_errors", }; char buf[64]; int stats_dir; int i; uint64_t val = 0; snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname); stats_dir = open(buf, O_DIRECTORY); if (stats_dir < 0) return -1; for (i = 0; i < ARRAY_SIZE(counters); i++) if (read_uint64_file(stats_dir, counters[i], &val)) blobmsg_add_u64(b, counters[i], val); close(stats_dir); return 0; } static int system_addr(struct device *dev, struct device_addr *addr, int cmd) { bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4); int alen = v4 ? 4 : 16; unsigned int flags = 0; struct ifaddrmsg ifa = { .ifa_family = (alen == 4) ? AF_INET : AF_INET6, .ifa_prefixlen = addr->mask, .ifa_index = dev->ifindex, }; struct nl_msg *msg; if (cmd == RTM_NEWADDR) flags |= NLM_F_CREATE | NLM_F_REPLACE; msg = nlmsg_alloc_simple(cmd, flags); if (!msg) return -1; nlmsg_append(msg, &ifa, sizeof(ifa), 0); nla_put(msg, IFA_LOCAL, alen, &addr->addr); if (v4) { if (addr->broadcast) nla_put_u32(msg, IFA_BROADCAST, addr->broadcast); if (addr->point_to_point) nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point); } else { time_t now = system_get_rtime(); struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0}; if (addr->preferred_until) { int64_t preferred = addr->preferred_until - now; if (preferred < 0) preferred = 0; else if (preferred > UINT32_MAX) preferred = UINT32_MAX; cinfo.ifa_prefered = preferred; } if (addr->valid_until) { int64_t valid = addr->valid_until - now; if (valid <= 0) return -1; else if (valid > UINT32_MAX) valid = UINT32_MAX; cinfo.ifa_valid = valid; } nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo); } return system_rtnl_call(msg); } int system_add_address(struct device *dev, struct device_addr *addr) { return system_addr(dev, addr, RTM_NEWADDR); } int system_del_address(struct device *dev, struct device_addr *addr) { return system_addr(dev, addr, RTM_DELADDR); } static int system_rt(struct device *dev, struct device_route *route, int cmd) { int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16; bool have_gw; unsigned int flags = 0; if (alen == 4) have_gw = !!route->nexthop.in.s_addr; else have_gw = route->nexthop.in6.s6_addr32[0] || route->nexthop.in6.s6_addr32[1] || route->nexthop.in6.s6_addr32[2] || route->nexthop.in6.s6_addr32[3]; unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE : (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK; unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE)) ? route->table : RT_TABLE_MAIN; struct rtmsg rtm = { .rtm_family = (alen == 4) ? AF_INET : AF_INET6, .rtm_dst_len = route->mask, .rtm_src_len = route->sourcemask, .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC, .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC, .rtm_scope = scope, .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST, }; struct nl_msg *msg; if (cmd == RTM_NEWROUTE) { flags |= NLM_F_CREATE | NLM_F_REPLACE; if (!dev) { // Add null-route rtm.rtm_scope = RT_SCOPE_UNIVERSE; rtm.rtm_type = RTN_UNREACHABLE; } } msg = nlmsg_alloc_simple(cmd, flags); if (!msg) return -1; nlmsg_append(msg, &rtm, sizeof(rtm), 0); if (route->mask) nla_put(msg, RTA_DST, alen, &route->addr); if (route->sourcemask) nla_put(msg, RTA_SRC, alen, &route->source); if (route->metric > 0) nla_put_u32(msg, RTA_PRIORITY, route->metric); if (have_gw) nla_put(msg, RTA_GATEWAY, alen, &route->nexthop); if (dev) nla_put_u32(msg, RTA_OIF, dev->ifindex); if (table >= 256) nla_put_u32(msg, RTA_TABLE, table); return system_rtnl_call(msg); } int system_add_route(struct device *dev, struct device_route *route) { return system_rt(dev, route, RTM_NEWROUTE); } int system_del_route(struct device *dev, struct device_route *route) { return system_rt(dev, route, RTM_DELROUTE); } int system_flush_routes(void) { const char *names[] = { "/proc/sys/net/ipv4/route/flush", "/proc/sys/net/ipv6/route/flush" }; int fd, i; for (i = 0; i < ARRAY_SIZE(names); i++) { fd = open(names[i], O_WRONLY); if (fd < 0) continue; if (write(fd, "-1", 2)) {} close(fd); } return 0; } bool system_resolve_rt_table(const char *name, unsigned int *id) { FILE *f; char *e, buf[128]; unsigned int n, table = RT_TABLE_UNSPEC; /* first try to parse table as number */ if ((n = strtoul(name, &e, 0)) > 0 && !*e) table = n; /* handle well known aliases */ else if (!strcmp(name, "default")) table = RT_TABLE_DEFAULT; else if (!strcmp(name, "main")) table = RT_TABLE_MAIN; else if (!strcmp(name, "local")) table = RT_TABLE_LOCAL; /* try to look up name in /etc/iproute2/rt_tables */ else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL) { while (fgets(buf, sizeof(buf) - 1, f) != NULL) { if ((e = strtok(buf, " \t\n")) == NULL || *e == '#') continue; n = strtoul(e, NULL, 10); e = strtok(NULL, " \t\n"); if (e && !strcmp(e, name)) { table = n; break; } } fclose(f); } if (table == RT_TABLE_UNSPEC) return false; /* do not consider main table special */ if (table == RT_TABLE_MAIN) table = RT_TABLE_UNSPEC; *id = table; return true; } static int system_iprule(struct iprule *rule, int cmd) { int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16; struct nl_msg *msg; struct rtmsg rtm = { .rtm_family = (alen == 4) ? AF_INET : AF_INET6, .rtm_protocol = RTPROT_STATIC, .rtm_scope = RT_SCOPE_UNIVERSE, .rtm_table = RT_TABLE_UNSPEC, .rtm_type = RTN_UNSPEC, .rtm_flags = 0, }; if (cmd == RTM_NEWRULE) { rtm.rtm_type = RTN_UNICAST; rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL; } if (rule->invert) rtm.rtm_flags |= FIB_RULE_INVERT; if (rule->flags & IPRULE_SRC) rtm.rtm_src_len = rule->src_mask; if (rule->flags & IPRULE_DEST) rtm.rtm_dst_len = rule->dest_mask; if (rule->flags & IPRULE_TOS) rtm.rtm_tos = rule->tos; if (rule->flags & IPRULE_LOOKUP) { if (rule->lookup < 256) rtm.rtm_table = rule->lookup; } if (rule->flags & IPRULE_ACTION) rtm.rtm_type = rule->action; else if (rule->flags & IPRULE_GOTO) rtm.rtm_type = FR_ACT_GOTO; else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO))) rtm.rtm_type = FR_ACT_NOP; msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST); if (!msg) return -1; nlmsg_append(msg, &rtm, sizeof(rtm), 0); if (rule->flags & IPRULE_IN) nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev); if (rule->flags & IPRULE_OUT) nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev); if (rule->flags & IPRULE_SRC) nla_put(msg, FRA_SRC, alen, &rule->src_addr); if (rule->flags & IPRULE_DEST) nla_put(msg, FRA_DST, alen, &rule->dest_addr); if (rule->flags & IPRULE_PRIORITY) nla_put_u32(msg, FRA_PRIORITY, rule->priority); else if (cmd == RTM_NEWRULE) nla_put_u32(msg, FRA_PRIORITY, rule->order); if (rule->flags & IPRULE_FWMARK) nla_put_u32(msg, FRA_FWMARK, rule->fwmark); if (rule->flags & IPRULE_FWMASK) nla_put_u32(msg, FRA_FWMASK, rule->fwmask); if (rule->flags & IPRULE_LOOKUP) { if (rule->lookup >= 256) nla_put_u32(msg, FRA_TABLE, rule->lookup); } if (rule->flags & IPRULE_GOTO) nla_put_u32(msg, FRA_GOTO, rule->gotoid); return system_rtnl_call(msg); } int system_add_iprule(struct iprule *rule) { return system_iprule(rule, RTM_NEWRULE); } int system_del_iprule(struct iprule *rule) { return system_iprule(rule, RTM_DELRULE); } int system_flush_iprules(void) { int rv = 0; struct iprule rule; system_if_clear_entries(NULL, RTM_GETRULE, AF_INET); system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6); memset(&rule, 0, sizeof(rule)); rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP; rule.priority = 0; rule.lookup = RT_TABLE_LOCAL; rv |= system_iprule(&rule, RTM_NEWRULE); rule.priority = 32766; rule.lookup = RT_TABLE_MAIN; rv |= system_iprule(&rule, RTM_NEWRULE); rule.priority = 32767; rule.lookup = RT_TABLE_DEFAULT; rv |= system_iprule(&rule, RTM_NEWRULE); rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP; rule.priority = 0; rule.lookup = RT_TABLE_LOCAL; rv |= system_iprule(&rule, RTM_NEWRULE); rule.priority = 32766; rule.lookup = RT_TABLE_MAIN; rv |= system_iprule(&rule, RTM_NEWRULE); return rv; } bool system_resolve_iprule_action(const char *action, unsigned int *id) { char *e; unsigned int n; if (!strcmp(action, "local")) n = RTN_LOCAL; else if (!strcmp(action, "nat")) n = RTN_NAT; else if (!strcmp(action, "broadcast")) n = RTN_BROADCAST; else if (!strcmp(action, "anycast")) n = RTN_ANYCAST; else if (!strcmp(action, "multicast")) n = RTN_MULTICAST; else if (!strcmp(action, "prohibit")) n = RTN_PROHIBIT; else if (!strcmp(action, "unreachable")) n = RTN_UNREACHABLE; else if (!strcmp(action, "blackhole")) n = RTN_BLACKHOLE; else if (!strcmp(action, "xresolve")) n = RTN_XRESOLVE; else if (!strcmp(action, "unicast")) n = RTN_UNICAST; else if (!strcmp(action, "throw")) n = RTN_THROW; else if (!strcmp(action, "failed_policy")) n = RTN_FAILED_POLICY; else { n = strtoul(action, &e, 0); if (!e || *e || e == action || n > 255) return false; } *id = n; return true; } time_t system_get_rtime(void) { struct timespec ts; struct timeval tv; if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0) return ts.tv_sec; if (gettimeofday(&tv, NULL) == 0) return tv.tv_sec; return 0; } #ifndef IP_DF #define IP_DF 0x4000 #endif static int tunnel_ioctl(const char *name, int cmd, void *p) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); ifr.ifr_ifru.ifru_data = p; return ioctl(sock_ioctl, cmd, &ifr); } int system_del_ip_tunnel(const char *name) { return tunnel_ioctl(name, SIOCDELTUNNEL, NULL); } int system_update_ipv6_mtu(struct device *dev, int mtu) { int ret = -1; char buf[64]; snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu", dev->ifname); int fd = open(buf, O_RDWR); ssize_t len = read(fd, buf, sizeof(buf) - 1); if (len < 0) goto out; buf[len] = 0; ret = atoi(buf); if (!mtu || ret <= mtu) goto out; lseek(fd, 0, SEEK_SET); if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0) ret = -1; out: close(fd); return ret; } int system_add_ip_tunnel(const char *name, struct blob_attr *attr) { struct blob_attr *tb[__TUNNEL_ATTR_MAX]; struct blob_attr *cur; bool set_df = true; const char *str; system_del_ip_tunnel(name); blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb, blob_data(attr), blob_len(attr)); if (!(cur = tb[TUNNEL_ATTR_TYPE])) return -EINVAL; str = blobmsg_data(cur); if ((cur = tb[TUNNEL_ATTR_DF])) set_df = blobmsg_get_bool(cur); unsigned int ttl = 0; if ((cur = tb[TUNNEL_ATTR_TTL])) { ttl = blobmsg_get_u32(cur); if (ttl > 255 || (!set_df && ttl)) return -EINVAL; } unsigned int link = 0; if ((cur = tb[TUNNEL_ATTR_LINK])) { struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node); if (!iface) return -EINVAL; if (iface->l3_dev.dev) link = iface->l3_dev.dev->ifindex; } if (!strcmp(str, "sit")) { struct ip_tunnel_parm p = { .link = link, .iph = { .version = 4, .ihl = 5, .frag_off = set_df ? htons(IP_DF) : 0, .protocol = IPPROTO_IPV6, .ttl = ttl } }; if ((cur = tb[TUNNEL_ATTR_LOCAL]) && inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1) return -EINVAL; if ((cur = tb[TUNNEL_ATTR_REMOTE]) && inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1) return -EINVAL; strncpy(p.name, name, sizeof(p.name)); if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0) return -1; #ifdef SIOCADD6RD if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) { unsigned int mask; struct ip_tunnel_6rd p6; memset(&p6, 0, sizeof(p6)); if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur), &p6.prefix, &mask) || mask > 128) return -EINVAL; p6.prefixlen = mask; if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) { if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur), &p6.relay_prefix, &mask) || mask > 32) return -EINVAL; p6.relay_prefixlen = mask; } if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) { system_del_ip_tunnel(name); return -1; } } #endif } else if (!strcmp(str, "ipip6")) { struct ip6_tnl_parm p = { .link = link, .proto = IPPROTO_IPIP, .hop_limit = (ttl) ? ttl : 64, .encap_limit = 4, }; if ((cur = tb[TUNNEL_ATTR_LOCAL]) && inet_pton(AF_INET6, blobmsg_data(cur), &p.laddr) < 1) return -EINVAL; if ((cur = tb[TUNNEL_ATTR_REMOTE]) && inet_pton(AF_INET6, blobmsg_data(cur), &p.raddr) < 1) return -EINVAL; strncpy(p.name, name, sizeof(p.name)); if (tunnel_ioctl("ip6tnl0", SIOCADDTUNNEL, &p) < 0) return -1; } else return -EINVAL; return 0; }