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- /*
- * netifd - network interface daemon
- * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
- * Copyright (C) 2013 Steven Barth <steven@midlink.org>
- * Copyright (C) 2014 Gioacchino Mazzurco <gio@eigenlab.org>
- *
- * 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 <sys/socket.h>
- #include <sys/ioctl.h>
- #include <sys/stat.h>
- #include <sys/syscall.h>
- #include <net/if.h>
- #include <net/if_arp.h>
- #include <arpa/inet.h>
- #include <netinet/in.h>
- #include <linux/rtnetlink.h>
- #include <linux/sockios.h>
- #include <linux/ip.h>
- #include <linux/if_link.h>
- #include <linux/if_vlan.h>
- #include <linux/if_bridge.h>
- #include <linux/if_tunnel.h>
- #include <linux/ip6_tunnel.h>
- #include <linux/ethtool.h>
- #include <linux/fib_rules.h>
- #include <linux/version.h>
- #ifndef RTN_FAILED_POLICY
- #define RTN_FAILED_POLICY 12
- #endif
- #include <string.h>
- #include <fcntl.h>
- #include <glob.h>
- #include <time.h>
- #include <netlink/msg.h>
- #include <netlink/attr.h>
- #include <netlink/socket.h>
- #include <libubox/uloop.h>
- #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;
- }
- static bool
- system_rtn_aton(const char *src, unsigned int *dst)
- {
- char *e;
- unsigned int n;
- if (!strcmp(src, "local"))
- n = RTN_LOCAL;
- else if (!strcmp(src, "nat"))
- n = RTN_NAT;
- else if (!strcmp(src, "broadcast"))
- n = RTN_BROADCAST;
- else if (!strcmp(src, "anycast"))
- n = RTN_ANYCAST;
- else if (!strcmp(src, "multicast"))
- n = RTN_MULTICAST;
- else if (!strcmp(src, "prohibit"))
- n = RTN_PROHIBIT;
- else if (!strcmp(src, "unreachable"))
- n = RTN_UNREACHABLE;
- else if (!strcmp(src, "blackhole"))
- n = RTN_BLACKHOLE;
- else if (!strcmp(src, "xresolve"))
- n = RTN_XRESOLVE;
- else if (!strcmp(src, "unicast"))
- n = RTN_UNICAST;
- else if (!strcmp(src, "throw"))
- n = RTN_THROW;
- else if (!strcmp(src, "failed_policy"))
- n = RTN_FAILED_POLICY;
- else {
- n = strtoul(src, &e, 0);
- if (!e || *e || e == src || n > 255)
- return false;
- }
- *dst = n;
- 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);
- }
- static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
- {
- int fd = -1, ret = -1;
- fd = open(path, O_RDONLY);
- if (fd < 0)
- goto out;
- ssize_t len = read(fd, buf, buf_sz - 1);
- if (len < 0)
- goto out;
- ret = buf[len] = 0;
- out:
- if (fd >= 0)
- close(fd);
- return ret;
- }
- static int
- system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
- {
- snprintf(dev_buf, sizeof(dev_buf), path, device);
- return system_get_sysctl(dev_buf, buf, buf_sz);
- }
- static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
- {
- return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
- dev->ifname, buf, buf_sz);
- }
- #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;
- }
- static void system_bridge_set_wireless(const char *bridge, const char *dev)
- {
- snprintf(dev_buf, sizeof(dev_buf),
- "/sys/devices/virtual/net/%s/brif/%s/multicast_to_unicast",
- bridge, dev);
- system_set_sysctl(dev_buf, "1");
- }
- int system_bridge_addif(struct device *bridge, struct device *dev)
- {
- char *oldbr;
- int ret = 0;
- oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
- if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
- ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
- if (dev->wireless)
- system_bridge_set_wireless(bridge->ifname, dev->ifname);
- return ret;
- }
- int system_bridge_delif(struct device *bridge, struct device *dev)
- {
- 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;
- device_set_ifindex(dev, system_if_resolve(dev));
- if (dev->external || !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");
- system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
- 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_UNSPEC, };
- 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_string(msg, IFLA_IFNAME, macvlan->ifname);
- nla_put_u32(msg, IFLA_LINK, ifindex);
- if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
- goto nla_put_failure;
- nla_put_string(msg, IFLA_INFO_KIND, "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;
- }
- static int system_link_del(const char *ifname)
- {
- struct nl_msg *msg;
- struct ifinfomsg iim = {
- .ifi_family = AF_UNSPEC,
- .ifi_index = 0,
- };
- msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
- if (!msg)
- return -1;
- nlmsg_append(msg, &iim, sizeof(iim), 0);
- nla_put_string(msg, IFLA_IFNAME, ifname);
- return system_rtnl_call(msg);
- }
- int system_macvlan_del(struct device *macvlan)
- {
- return system_link_del(macvlan->ifname);
- }
- 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);
- }
- int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
- {
- struct nl_msg *msg;
- struct nlattr *linkinfo, *data;
- struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
- int ifindex = system_if_resolve(dev);
- int rv;
- 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);
- nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
- nla_put_u32(msg, IFLA_LINK, ifindex);
-
- if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
- goto nla_put_failure;
-
- nla_put_string(msg, IFLA_INFO_KIND, "vlan");
- if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
- goto nla_put_failure;
- nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
- nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
- #else
- if(cfg->proto == VLAN_PROTO_8021AD)
- netifd_log_message(L_WARNING, "%s Your kernel is older than linux 3.10.0, 802.1ad is not supported defaulting to 802.1q", vlandev->type->name);
- #endif
- nla_nest_end(msg, data);
- nla_nest_end(msg, linkinfo);
- rv = system_rtnl_call(msg);
- if (rv)
- D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
- return rv;
- nla_put_failure:
- nlmsg_free(msg);
- return -ENOMEM;
- }
- int system_vlandev_del(struct device *vlandev)
- {
- return system_link_del(vlandev->ifname);
- }
- static void
- system_if_get_settings(struct device *dev, struct device_settings *s)
- {
- struct ifreq ifr;
- char buf[10];
- 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;
- }
- if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
- s->ipv6 = !strtoul(buf, NULL, 0);
- s->flags |= DEV_OPT_IPV6;
- }
- if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
- s->promisc = ifr.ifr_flags & IFF_PROMISC;
- s->flags |= DEV_OPT_PROMISC;
- }
- }
- void
- system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
- {
- struct ifreq ifr;
- if (!apply_mask)
- return;
- memset(&ifr, 0, sizeof(ifr));
- strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
- if (s->flags & DEV_OPT_MTU & apply_mask) {
- ifr.ifr_mtu = s->mtu;
- if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
- s->flags &= ~DEV_OPT_MTU;
- }
- if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
- ifr.ifr_qlen = s->txqueuelen;
- if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
- s->flags &= ~DEV_OPT_TXQUEUELEN;
- }
- if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !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;
- }
- if (s->flags & DEV_OPT_IPV6 & apply_mask)
- system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
- if (s->flags & DEV_OPT_PROMISC & apply_mask) {
- if (system_if_flags(dev->ifname, s->promisc ? IFF_PROMISC : 0,
- !s->promisc ? IFF_PROMISC : 0) < 0)
- s->flags &= ~DEV_OPT_PROMISC;
- }
- }
- int system_if_up(struct device *dev)
- {
- system_if_get_settings(dev, &dev->orig_settings);
- system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
- 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, dev->orig_settings.flags);
- 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 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 = RT_SCOPE_NOWHERE,
- .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
- .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
- };
- 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;
- }
- else
- rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
- }
- if (route->flags & DEVROUTE_TYPE) {
- rtm.rtm_type = route->type;
- if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
- if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
- rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
- rtm.rtm_table = RT_TABLE_LOCAL;
- }
- if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT)
- rtm.rtm_scope = RT_SCOPE_HOST;
- else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
- rtm.rtm_type == RTN_ANYCAST)
- rtm.rtm_scope = RT_SCOPE_LINK;
- }
- 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);
- if (route->flags & DEVROUTE_MTU) {
- struct nlattr *metrics;
- if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
- goto nla_put_failure;
- nla_put_u32(msg, RTAX_MTU, route->mtu);
- nla_nest_end(msg, metrics);
- }
- return system_rtnl_call(msg);
- nla_put_failure:
- nlmsg_free(msg);
- return -ENOMEM;
- }
- 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_type(const char *type, unsigned int *id)
- {
- return system_rtn_aton(type, id);
- }
- 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;
- *id = table;
- return true;
- }
- bool system_is_default_rt_table(unsigned int id)
- {
- return (id == RT_TABLE_MAIN);
- }
- 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)
- {
- return system_rtn_aton(action, id);
- }
- 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);
- }
- #ifdef IFLA_IPTUN_MAX
- #define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
- static int system_add_gre_tunnel(const char *name, const char *kind,
- const unsigned int link, struct blob_attr **tb, bool v6)
- {
- struct nl_msg *nlm;
- struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
- struct blob_attr *cur;
- uint32_t ikey = 0, okey = 0, flags = 0, flowinfo = 0;
- uint16_t iflags = 0, oflags = 0;
- uint8_t tos = 0;
- int ret = 0, ttl = 64;
- nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
- if (!nlm)
- return -1;
- nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
- nla_put_string(nlm, IFLA_IFNAME, name);
- struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
- if (!linkinfo) {
- ret = -ENOMEM;
- goto failure;
- }
- nla_put_string(nlm, IFLA_INFO_KIND, kind);
- struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
- if (!infodata) {
- ret = -ENOMEM;
- goto failure;
- }
- if (link)
- nla_put_u32(nlm, IFLA_GRE_LINK, link);
- if ((cur = tb[TUNNEL_ATTR_TTL]))
- ttl = blobmsg_get_u32(cur);
- nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
- if ((cur = tb[TUNNEL_ATTR_TOS])) {
- char *str = blobmsg_get_string(cur);
- if (strcmp(str, "inherit")) {
- unsigned uval;
- char *e;
- uval = strtoul(str, &e, 16);
- if (e == str || *e || uval > 255) {
- ret = -EINVAL;
- goto failure;
- }
- if (v6)
- flowinfo |= htonl(uval << 20) & IP6_FLOWINFO_TCLASS;
- else
- tos = uval;
- } else {
- if (v6)
- flags |= IP6_TNL_F_USE_ORIG_TCLASS;
- else
- tos = 1;
- }
- }
- if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
- uint8_t icsum, ocsum, iseqno, oseqno;
- if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
- &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
- ret = -EINVAL;
- goto failure;
- }
- if (ikey)
- iflags |= GRE_KEY;
- if (okey)
- oflags |= GRE_KEY;
- if (icsum)
- iflags |= GRE_CSUM;
- if (ocsum)
- oflags |= GRE_CSUM;
- if (iseqno)
- iflags |= GRE_SEQ;
- if (oseqno)
- oflags |= GRE_SEQ;
- }
- if (v6) {
- struct in6_addr in6buf;
- if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
- if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
- ret = -EINVAL;
- goto failure;
- }
- nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
- }
- if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
- if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
- ret = -EINVAL;
- goto failure;
- }
- nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
- }
- nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
- if (flowinfo)
- nla_put_u32(nlm, IFLA_GRE_FLOWINFO, flowinfo);
- if (flags)
- nla_put_u32(nlm, IFLA_GRE_FLAGS, flags);
- } else {
- struct in_addr inbuf;
- bool set_df = true;
- if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
- if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
- ret = -EINVAL;
- goto failure;
- }
- nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
- }
- if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
- if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
- ret = -EINVAL;
- goto failure;
- }
- nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
- if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
- if (!okey) {
- okey = inbuf.s_addr;
- oflags |= GRE_KEY;
- }
- if (!ikey) {
- ikey = inbuf.s_addr;
- iflags |= GRE_KEY;
- }
- }
- }
- if ((cur = tb[TUNNEL_ATTR_DF]))
- set_df = blobmsg_get_bool(cur);
- nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
- nla_put_u8(nlm, IFLA_GRE_TOS, tos);
- }
- if (oflags)
- nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
- if (iflags)
- nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
- if (okey)
- nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
- if (ikey)
- nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
- nla_nest_end(nlm, infodata);
- nla_nest_end(nlm, linkinfo);
- return system_rtnl_call(nlm);
- failure:
- nlmsg_free(nlm);
- return ret;
- }
- #endif
- static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
- {
- struct blob_attr *cur;
- const char *str;
- if (!(cur = tb[TUNNEL_ATTR_TYPE]))
- return -EINVAL;
- str = blobmsg_data(cur);
- if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
- !strcmp(str, "greip6") || !strcmp(str, "gretapip6"))
- return system_link_del(name);
- else
- return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
- }
- int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
- {
- struct blob_attr *tb[__TUNNEL_ATTR_MAX];
- blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
- blob_data(attr), blob_len(attr));
- return __system_del_ip_tunnel(name, tb);
- }
- 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;
- blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
- blob_data(attr), blob_len(attr));
- __system_del_ip_tunnel(name, tb);
- 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, tb);
- return -1;
- }
- }
- #endif
- #ifdef IFLA_IPTUN_MAX
- } else if (!strcmp(str, "ipip6")) {
- struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
- NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
- struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
- int ret = 0;
- if (!nlm)
- return -1;
- nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
- nla_put_string(nlm, IFLA_IFNAME, name);
- if (link)
- nla_put_u32(nlm, IFLA_LINK, link);
- struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
- if (!linkinfo) {
- ret = -ENOMEM;
- goto failure;
- }
- nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
- struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
- if (!infodata) {
- ret = -ENOMEM;
- goto failure;
- }
- if (link)
- nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
- nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
- nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
- nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
- struct in6_addr in6buf;
- if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
- if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
- ret = -EINVAL;
- goto failure;
- }
- nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
- }
- if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
- if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
- ret = -EINVAL;
- goto failure;
- }
- nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
- }
- #ifdef IFLA_IPTUN_FMR_MAX
- if ((cur = tb[TUNNEL_ATTR_FMRS])) {
- struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
- struct blob_attr *fmr;
- unsigned rem, fmrcnt = 0;
- blobmsg_for_each_attr(fmr, cur, rem) {
- if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
- continue;
- unsigned ip4len, ip6len, ealen, offset = 6;
- char ip6buf[48];
- char ip4buf[16];
- if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
- ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5) {
- ret = -EINVAL;
- goto failure;
- }
- struct in6_addr ip6prefix;
- struct in_addr ip4prefix;
- if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
- inet_pton(AF_INET, ip4buf, &ip4prefix) != 1) {
- ret = -EINVAL;
- goto failure;
- }
- struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
- nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
- nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
- nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
- nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
- nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
- nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
- nla_nest_end(nlm, rule);
- }
- nla_nest_end(nlm, fmrs);
- }
- #endif
- nla_nest_end(nlm, infodata);
- nla_nest_end(nlm, linkinfo);
- return system_rtnl_call(nlm);
- failure:
- nlmsg_free(nlm);
- return ret;
- } else if (!strcmp(str, "greip")) {
- return system_add_gre_tunnel(name, "gre", link, tb, false);
- } else if (!strcmp(str, "gretapip")) {
- return system_add_gre_tunnel(name, "gretap", link, tb, false);
- } else if (!strcmp(str, "greip6")) {
- return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
- } else if (!strcmp(str, "gretapip6")) {
- return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
- #endif
- }
- else
- return -EINVAL;
- return 0;
- }
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