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system-linux.c
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/*
* netifd - network interface daemon
* Copyright (C) 2012 Felix Fietkau <[email protected]>
* Copyright (C) 2013 Jo-Philipp Wich <[email protected]>
* Copyright (C) 2013 Steven Barth <[email protected]>
* Copyright (C) 2014 Gioacchino Mazzurco <[email protected]>
* Copyright (C) 2017 Matthias Schiffer <[email protected]>
*
* 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/ether.h>
#include <netinet/in.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <linux/ip.h>
#include <linux/if_addr.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/veth.h>
#include <linux/version.h>
#ifndef RTN_FAILED_POLICY
#define RTN_FAILED_POLICY 12
#endif
#ifndef IFA_F_NOPREFIXROUTE
#define IFA_F_NOPREFIXROUTE 0x200
#endif
#ifndef IFA_FLAGS
#define IFA_FLAGS (IFA_MULTICAST + 1)
#endif
#include <string.h>
#include <fcntl.h>
#include <glob.h>
#include <time.h>
#include <unistd.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;
}
static bool
system_tos_aton(const char *src, unsigned *dst)
{
char *e;
*dst = strtoul(src, &e, 16);
if (e == src || *e || *dst > 255)
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);
}
static void system_set_rpfilter(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
}
static void system_set_acceptlocal(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
}
static void system_set_igmpversion(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version", dev->ifname, val);
}
static void system_set_mldversion(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version", dev->ifname, val);
}
static void system_set_neigh4reachabletime(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms", dev->ifname, val);
}
static void system_set_neigh6reachabletime(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms", dev->ifname, val);
}
static void system_set_neigh4gcstaletime(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/gc_stale_time", dev->ifname, val);
}
static void system_set_neigh6gcstaletime(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/gc_stale_time", dev->ifname, val);
}
static void system_set_neigh4locktime(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/locktime", dev->ifname, val);
}
static void system_set_dadtransmits(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/dad_transmits", dev->ifname, val);
}
static void system_bridge_set_multicast_to_unicast(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/class/net/%s/brport/multicast_to_unicast", dev->ifname, val);
}
static void system_bridge_set_multicast_fast_leave(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/class/net/%s/brport/multicast_fast_leave", dev->ifname, val);
}
static void system_bridge_set_hairpin_mode(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/class/net/%s/brport/hairpin_mode", dev->ifname, val);
}
static void system_bridge_set_multicast_router(struct device *dev, const char *val, bool bridge)
{
system_set_dev_sysctl(bridge ? "/sys/class/net/%s/bridge/multicast_router" :
"/sys/class/net/%s/brport/multicast_router",
dev->ifname, val);
}
static void system_bridge_set_robustness(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_startup_query_count",
dev->ifname, val);
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_last_member_count",
dev->ifname, val);
}
static void system_bridge_set_query_interval(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_query_interval",
dev->ifname, val);
}
static void system_bridge_set_query_response_interval(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_query_response_interval",
dev->ifname, val);
}
static void system_bridge_set_last_member_interval(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_last_member_interval",
dev->ifname, val);
}
static void system_bridge_set_membership_interval(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_membership_interval",
dev->ifname, val);
}
static void system_bridge_set_other_querier_timeout(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier_interval",
dev->ifname, val);
}
static void system_bridge_set_startup_query_interval(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_startup_query_interval",
dev->ifname, val);
}
static void system_bridge_set_learning(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/class/net/%s/brport/learning", dev->ifname, val);
}
static void system_bridge_set_unicast_flood(struct device *dev, const char *val)
{
system_set_dev_sysctl("/sys/class/net/%s/brport/unicast_flood", dev->ifname, val);
}
static void system_set_sendredirects(struct device *dev, const char *val)
{
system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/send_redirects", 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);
}
static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter",
dev->ifname, buf, buf_sz);
}
static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
dev->ifname, buf, buf_sz);
}
static int system_get_igmpversion(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version",
dev->ifname, buf, buf_sz);
}
static int system_get_mldversion(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version",
dev->ifname, buf, buf_sz);
}
static int system_get_neigh4reachabletime(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms",
dev->ifname, buf, buf_sz);
}
static int system_get_neigh6reachabletime(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms",
dev->ifname, buf, buf_sz);
}
static int system_get_neigh4gcstaletime(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/gc_stale_time",
dev->ifname, buf, buf_sz);
}
static int system_get_neigh6gcstaletime(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/gc_stale_time",
dev->ifname, buf, buf_sz);
}
static int system_get_neigh4locktime(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/locktime",
dev->ifname, buf, buf_sz);
}
static int system_get_dadtransmits(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/dad_transmits",
dev->ifname, buf, buf_sz);
}
static int system_get_sendredirects(struct device *dev, char *buf, const size_t buf_sz)
{
return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/send_redirects",
dev->ifname, buf, buf_sz);
}
// Evaluate netlink messages
static int cb_rtnl_event(struct nl_msg *msg, void *arg)
{
struct nlmsghdr *nh = nlmsg_hdr(msg);
struct nlattr *nla[__IFLA_MAX];
int link_state = 0;
char buf[10];
if (nh->nlmsg_type != RTM_NEWLINK)
goto out;
nlmsg_parse(nh, sizeof(struct ifinfomsg), nla, __IFLA_MAX - 1, NULL);
if (!nla[IFLA_IFNAME])
goto out;
struct device *dev = device_find(nla_data(nla[IFLA_IFNAME]));
if (!dev)
goto out;
if (!system_get_dev_sysctl("/sys/class/net/%s/carrier", dev->ifname, buf, sizeof(buf)))
link_state = strtoul(buf, NULL, 0);
device_set_link(dev, link_state ? 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_find(interface);
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 = -1;
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)
len = readlink(gl.gl_pathv[0], buf, buflen);
globfree(&gl);
if (len < 0)
return NULL;
buf[len] = 0;
path = strrchr(buf, '/');
if (!path)
return NULL;
return path + 1;
}
static void
system_bridge_set_wireless(struct device *bridge, struct device *dev)
{
bool mcast_to_ucast = dev->wireless_ap;
bool hairpin = true;
if (bridge->settings.flags & DEV_OPT_MULTICAST_TO_UNICAST &&
!bridge->settings.multicast_to_unicast)
mcast_to_ucast = false;
if (!mcast_to_ucast || dev->wireless_isolate)
hairpin = false;
system_bridge_set_multicast_to_unicast(dev, mcast_to_ucast ? "1" : "0");
system_bridge_set_hairpin_mode(dev, hairpin ? "1" : "0");
}
int system_bridge_addif(struct device *bridge, struct device *dev)
{
char buf[64];
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, dev);
if (dev->settings.flags & DEV_OPT_MULTICAST_ROUTER) {
snprintf(buf, sizeof(buf), "%i", dev->settings.multicast_router);
system_bridge_set_multicast_router(dev, buf, false);
}
if (dev->settings.flags & DEV_OPT_MULTICAST_FAST_LEAVE &&
dev->settings.multicast_fast_leave)
system_bridge_set_multicast_fast_leave(dev, "1");
if (dev->settings.flags & DEV_OPT_LEARNING &&
!dev->settings.learning)
system_bridge_set_learning(dev, "0");
if (dev->settings.flags & DEV_OPT_UNICAST_FLOOD &&
!dev->settings.unicast_flood)
system_bridge_set_unicast_flood(dev, "0");
return ret;
}
int system_bridge_delif(struct device *bridge, struct device *dev)
{
return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
}
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;
}
static void system_bridge_conf_multicast_deps(struct device *bridge,
struct bridge_config *cfg,
char *buf,
int buf_len)
{
int val;
if (cfg->flags & BRIDGE_OPT_ROBUSTNESS ||
cfg->flags & BRIDGE_OPT_QUERY_INTERVAL ||
cfg->flags & BRIDGE_OPT_QUERY_RESPONSE_INTERVAL) {
val = cfg->robustness * cfg->query_interval +
cfg->query_response_interval;
snprintf(buf, buf_len, "%i", val);
system_bridge_set_membership_interval(bridge, buf);
val = cfg->robustness * cfg->query_interval +
cfg->query_response_interval / 2;
snprintf(buf, buf_len, "%i", val);
system_bridge_set_other_querier_timeout(bridge, buf);
}
if (cfg->flags & BRIDGE_OPT_QUERY_INTERVAL) {
val = cfg->query_interval / 4;
snprintf(buf, buf_len, "%i", val);
system_bridge_set_startup_query_interval(bridge, buf);
}
}
static void system_bridge_conf_multicast(struct device *bridge,
struct bridge_config *cfg,
char *buf,
int buf_len)
{
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->multicast_querier ? "1" : "0");
snprintf(buf, buf_len, "%i", cfg->hash_max);
system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/hash_max",
bridge->ifname, buf);
if (bridge->settings.flags & DEV_OPT_MULTICAST_ROUTER) {
snprintf(buf, buf_len, "%i", bridge->settings.multicast_router);
system_bridge_set_multicast_router(bridge, buf, true);
}
if (cfg->flags & BRIDGE_OPT_ROBUSTNESS) {
snprintf(buf, buf_len, "%i", cfg->robustness);