mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
![Denis V. Lunev](/assets/img/avatar_default.png)
The namespace is not available in the fib_sync_down_addr, add it as a parameter. Looking up a device by the pointer to it is OK. Looking up using a result from fib_trie/fib_hash table lookup is also safe. No need to fix that at all. So, just fix lookup by address and insertion to the hash table path. Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1072 lines
24 KiB
C
1072 lines
24 KiB
C
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* IPv4 Forwarding Information Base: FIB frontend.
|
|
*
|
|
* Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/in.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if_addr.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
|
|
#include <net/ip.h>
|
|
#include <net/protocol.h>
|
|
#include <net/route.h>
|
|
#include <net/tcp.h>
|
|
#include <net/sock.h>
|
|
#include <net/icmp.h>
|
|
#include <net/arp.h>
|
|
#include <net/ip_fib.h>
|
|
#include <net/rtnetlink.h>
|
|
|
|
#ifndef CONFIG_IP_MULTIPLE_TABLES
|
|
|
|
static int __net_init fib4_rules_init(struct net *net)
|
|
{
|
|
struct fib_table *local_table, *main_table;
|
|
|
|
local_table = fib_hash_table(RT_TABLE_LOCAL);
|
|
if (local_table == NULL)
|
|
return -ENOMEM;
|
|
|
|
main_table = fib_hash_table(RT_TABLE_MAIN);
|
|
if (main_table == NULL)
|
|
goto fail;
|
|
|
|
hlist_add_head_rcu(&local_table->tb_hlist,
|
|
&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
|
|
hlist_add_head_rcu(&main_table->tb_hlist,
|
|
&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
|
|
return 0;
|
|
|
|
fail:
|
|
kfree(local_table);
|
|
return -ENOMEM;
|
|
}
|
|
#else
|
|
|
|
struct fib_table *fib_new_table(struct net *net, u32 id)
|
|
{
|
|
struct fib_table *tb;
|
|
unsigned int h;
|
|
|
|
if (id == 0)
|
|
id = RT_TABLE_MAIN;
|
|
tb = fib_get_table(net, id);
|
|
if (tb)
|
|
return tb;
|
|
|
|
tb = fib_hash_table(id);
|
|
if (!tb)
|
|
return NULL;
|
|
h = id & (FIB_TABLE_HASHSZ - 1);
|
|
hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
|
|
return tb;
|
|
}
|
|
|
|
struct fib_table *fib_get_table(struct net *net, u32 id)
|
|
{
|
|
struct fib_table *tb;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
unsigned int h;
|
|
|
|
if (id == 0)
|
|
id = RT_TABLE_MAIN;
|
|
h = id & (FIB_TABLE_HASHSZ - 1);
|
|
|
|
rcu_read_lock();
|
|
head = &net->ipv4.fib_table_hash[h];
|
|
hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
|
|
if (tb->tb_id == id) {
|
|
rcu_read_unlock();
|
|
return tb;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_IP_MULTIPLE_TABLES */
|
|
|
|
void fib_select_default(struct net *net,
|
|
const struct flowi *flp, struct fib_result *res)
|
|
{
|
|
struct fib_table *tb;
|
|
int table = RT_TABLE_MAIN;
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
if (res->r == NULL || res->r->action != FR_ACT_TO_TBL)
|
|
return;
|
|
table = res->r->table;
|
|
#endif
|
|
tb = fib_get_table(net, table);
|
|
if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
|
|
tb->tb_select_default(tb, flp, res);
|
|
}
|
|
|
|
static void fib_flush(struct net *net)
|
|
{
|
|
int flushed = 0;
|
|
struct fib_table *tb;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
unsigned int h;
|
|
|
|
for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
|
|
head = &net->ipv4.fib_table_hash[h];
|
|
hlist_for_each_entry(tb, node, head, tb_hlist)
|
|
flushed += tb->tb_flush(tb);
|
|
}
|
|
|
|
if (flushed)
|
|
rt_cache_flush(-1);
|
|
}
|
|
|
|
/*
|
|
* Find the first device with a given source address.
|
|
*/
|
|
|
|
struct net_device * ip_dev_find(struct net *net, __be32 addr)
|
|
{
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
|
|
struct fib_result res;
|
|
struct net_device *dev = NULL;
|
|
struct fib_table *local_table;
|
|
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
res.r = NULL;
|
|
#endif
|
|
|
|
local_table = fib_get_table(net, RT_TABLE_LOCAL);
|
|
if (!local_table || local_table->tb_lookup(local_table, &fl, &res))
|
|
return NULL;
|
|
if (res.type != RTN_LOCAL)
|
|
goto out;
|
|
dev = FIB_RES_DEV(res);
|
|
|
|
if (dev)
|
|
dev_hold(dev);
|
|
out:
|
|
fib_res_put(&res);
|
|
return dev;
|
|
}
|
|
|
|
/*
|
|
* Find address type as if only "dev" was present in the system. If
|
|
* on_dev is NULL then all interfaces are taken into consideration.
|
|
*/
|
|
static inline unsigned __inet_dev_addr_type(struct net *net,
|
|
const struct net_device *dev,
|
|
__be32 addr)
|
|
{
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
|
|
struct fib_result res;
|
|
unsigned ret = RTN_BROADCAST;
|
|
struct fib_table *local_table;
|
|
|
|
if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
|
|
return RTN_BROADCAST;
|
|
if (ipv4_is_multicast(addr))
|
|
return RTN_MULTICAST;
|
|
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
res.r = NULL;
|
|
#endif
|
|
|
|
local_table = fib_get_table(net, RT_TABLE_LOCAL);
|
|
if (local_table) {
|
|
ret = RTN_UNICAST;
|
|
if (!local_table->tb_lookup(local_table, &fl, &res)) {
|
|
if (!dev || dev == res.fi->fib_dev)
|
|
ret = res.type;
|
|
fib_res_put(&res);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
unsigned int inet_addr_type(struct net *net, __be32 addr)
|
|
{
|
|
return __inet_dev_addr_type(net, NULL, addr);
|
|
}
|
|
|
|
unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
|
|
__be32 addr)
|
|
{
|
|
return __inet_dev_addr_type(net, dev, addr);
|
|
}
|
|
|
|
/* Given (packet source, input interface) and optional (dst, oif, tos):
|
|
- (main) check, that source is valid i.e. not broadcast or our local
|
|
address.
|
|
- figure out what "logical" interface this packet arrived
|
|
and calculate "specific destination" address.
|
|
- check, that packet arrived from expected physical interface.
|
|
*/
|
|
|
|
int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
|
|
struct net_device *dev, __be32 *spec_dst, u32 *itag)
|
|
{
|
|
struct in_device *in_dev;
|
|
struct flowi fl = { .nl_u = { .ip4_u =
|
|
{ .daddr = src,
|
|
.saddr = dst,
|
|
.tos = tos } },
|
|
.iif = oif };
|
|
struct fib_result res;
|
|
int no_addr, rpf;
|
|
int ret;
|
|
struct net *net;
|
|
|
|
no_addr = rpf = 0;
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev) {
|
|
no_addr = in_dev->ifa_list == NULL;
|
|
rpf = IN_DEV_RPFILTER(in_dev);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (in_dev == NULL)
|
|
goto e_inval;
|
|
|
|
net = dev->nd_net;
|
|
if (fib_lookup(net, &fl, &res))
|
|
goto last_resort;
|
|
if (res.type != RTN_UNICAST)
|
|
goto e_inval_res;
|
|
*spec_dst = FIB_RES_PREFSRC(res);
|
|
fib_combine_itag(itag, &res);
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
|
|
#else
|
|
if (FIB_RES_DEV(res) == dev)
|
|
#endif
|
|
{
|
|
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
|
|
fib_res_put(&res);
|
|
return ret;
|
|
}
|
|
fib_res_put(&res);
|
|
if (no_addr)
|
|
goto last_resort;
|
|
if (rpf)
|
|
goto e_inval;
|
|
fl.oif = dev->ifindex;
|
|
|
|
ret = 0;
|
|
if (fib_lookup(net, &fl, &res) == 0) {
|
|
if (res.type == RTN_UNICAST) {
|
|
*spec_dst = FIB_RES_PREFSRC(res);
|
|
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
|
|
}
|
|
fib_res_put(&res);
|
|
}
|
|
return ret;
|
|
|
|
last_resort:
|
|
if (rpf)
|
|
goto e_inval;
|
|
*spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
|
|
*itag = 0;
|
|
return 0;
|
|
|
|
e_inval_res:
|
|
fib_res_put(&res);
|
|
e_inval:
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline __be32 sk_extract_addr(struct sockaddr *addr)
|
|
{
|
|
return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
|
|
}
|
|
|
|
static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = (struct nlattr *) ((char *) mx + len);
|
|
nla->nla_type = type;
|
|
nla->nla_len = nla_attr_size(4);
|
|
*(u32 *) nla_data(nla) = value;
|
|
|
|
return len + nla_total_size(4);
|
|
}
|
|
|
|
static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
|
|
struct fib_config *cfg)
|
|
{
|
|
__be32 addr;
|
|
int plen;
|
|
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
cfg->fc_nlinfo.nl_net = net;
|
|
|
|
if (rt->rt_dst.sa_family != AF_INET)
|
|
return -EAFNOSUPPORT;
|
|
|
|
/*
|
|
* Check mask for validity:
|
|
* a) it must be contiguous.
|
|
* b) destination must have all host bits clear.
|
|
* c) if application forgot to set correct family (AF_INET),
|
|
* reject request unless it is absolutely clear i.e.
|
|
* both family and mask are zero.
|
|
*/
|
|
plen = 32;
|
|
addr = sk_extract_addr(&rt->rt_dst);
|
|
if (!(rt->rt_flags & RTF_HOST)) {
|
|
__be32 mask = sk_extract_addr(&rt->rt_genmask);
|
|
|
|
if (rt->rt_genmask.sa_family != AF_INET) {
|
|
if (mask || rt->rt_genmask.sa_family)
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
if (bad_mask(mask, addr))
|
|
return -EINVAL;
|
|
|
|
plen = inet_mask_len(mask);
|
|
}
|
|
|
|
cfg->fc_dst_len = plen;
|
|
cfg->fc_dst = addr;
|
|
|
|
if (cmd != SIOCDELRT) {
|
|
cfg->fc_nlflags = NLM_F_CREATE;
|
|
cfg->fc_protocol = RTPROT_BOOT;
|
|
}
|
|
|
|
if (rt->rt_metric)
|
|
cfg->fc_priority = rt->rt_metric - 1;
|
|
|
|
if (rt->rt_flags & RTF_REJECT) {
|
|
cfg->fc_scope = RT_SCOPE_HOST;
|
|
cfg->fc_type = RTN_UNREACHABLE;
|
|
return 0;
|
|
}
|
|
|
|
cfg->fc_scope = RT_SCOPE_NOWHERE;
|
|
cfg->fc_type = RTN_UNICAST;
|
|
|
|
if (rt->rt_dev) {
|
|
char *colon;
|
|
struct net_device *dev;
|
|
char devname[IFNAMSIZ];
|
|
|
|
if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
|
|
return -EFAULT;
|
|
|
|
devname[IFNAMSIZ-1] = 0;
|
|
colon = strchr(devname, ':');
|
|
if (colon)
|
|
*colon = 0;
|
|
dev = __dev_get_by_name(net, devname);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
cfg->fc_oif = dev->ifindex;
|
|
if (colon) {
|
|
struct in_ifaddr *ifa;
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
if (!in_dev)
|
|
return -ENODEV;
|
|
*colon = ':';
|
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
|
|
if (strcmp(ifa->ifa_label, devname) == 0)
|
|
break;
|
|
if (ifa == NULL)
|
|
return -ENODEV;
|
|
cfg->fc_prefsrc = ifa->ifa_local;
|
|
}
|
|
}
|
|
|
|
addr = sk_extract_addr(&rt->rt_gateway);
|
|
if (rt->rt_gateway.sa_family == AF_INET && addr) {
|
|
cfg->fc_gw = addr;
|
|
if (rt->rt_flags & RTF_GATEWAY &&
|
|
inet_addr_type(net, addr) == RTN_UNICAST)
|
|
cfg->fc_scope = RT_SCOPE_UNIVERSE;
|
|
}
|
|
|
|
if (cmd == SIOCDELRT)
|
|
return 0;
|
|
|
|
if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
|
|
return -EINVAL;
|
|
|
|
if (cfg->fc_scope == RT_SCOPE_NOWHERE)
|
|
cfg->fc_scope = RT_SCOPE_LINK;
|
|
|
|
if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
|
|
struct nlattr *mx;
|
|
int len = 0;
|
|
|
|
mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
|
|
if (mx == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (rt->rt_flags & RTF_MTU)
|
|
len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
|
|
|
|
if (rt->rt_flags & RTF_WINDOW)
|
|
len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
|
|
|
|
if (rt->rt_flags & RTF_IRTT)
|
|
len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
|
|
|
|
cfg->fc_mx = mx;
|
|
cfg->fc_mx_len = len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle IP routing ioctl calls. These are used to manipulate the routing tables
|
|
*/
|
|
|
|
int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct fib_config cfg;
|
|
struct rtentry rt;
|
|
int err;
|
|
|
|
switch (cmd) {
|
|
case SIOCADDRT: /* Add a route */
|
|
case SIOCDELRT: /* Delete a route */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&rt, arg, sizeof(rt)))
|
|
return -EFAULT;
|
|
|
|
rtnl_lock();
|
|
err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
|
|
if (err == 0) {
|
|
struct fib_table *tb;
|
|
|
|
if (cmd == SIOCDELRT) {
|
|
tb = fib_get_table(net, cfg.fc_table);
|
|
if (tb)
|
|
err = tb->tb_delete(tb, &cfg);
|
|
else
|
|
err = -ESRCH;
|
|
} else {
|
|
tb = fib_new_table(net, cfg.fc_table);
|
|
if (tb)
|
|
err = tb->tb_insert(tb, &cfg);
|
|
else
|
|
err = -ENOBUFS;
|
|
}
|
|
|
|
/* allocated by rtentry_to_fib_config() */
|
|
kfree(cfg.fc_mx);
|
|
}
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = {
|
|
[RTA_DST] = { .type = NLA_U32 },
|
|
[RTA_SRC] = { .type = NLA_U32 },
|
|
[RTA_IIF] = { .type = NLA_U32 },
|
|
[RTA_OIF] = { .type = NLA_U32 },
|
|
[RTA_GATEWAY] = { .type = NLA_U32 },
|
|
[RTA_PRIORITY] = { .type = NLA_U32 },
|
|
[RTA_PREFSRC] = { .type = NLA_U32 },
|
|
[RTA_METRICS] = { .type = NLA_NESTED },
|
|
[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
|
|
[RTA_PROTOINFO] = { .type = NLA_U32 },
|
|
[RTA_FLOW] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct fib_config *cfg)
|
|
{
|
|
struct nlattr *attr;
|
|
int err, remaining;
|
|
struct rtmsg *rtm;
|
|
|
|
err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
cfg->fc_dst_len = rtm->rtm_dst_len;
|
|
cfg->fc_tos = rtm->rtm_tos;
|
|
cfg->fc_table = rtm->rtm_table;
|
|
cfg->fc_protocol = rtm->rtm_protocol;
|
|
cfg->fc_scope = rtm->rtm_scope;
|
|
cfg->fc_type = rtm->rtm_type;
|
|
cfg->fc_flags = rtm->rtm_flags;
|
|
cfg->fc_nlflags = nlh->nlmsg_flags;
|
|
|
|
cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
|
|
cfg->fc_nlinfo.nlh = nlh;
|
|
cfg->fc_nlinfo.nl_net = net;
|
|
|
|
if (cfg->fc_type > RTN_MAX) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
|
|
switch (nla_type(attr)) {
|
|
case RTA_DST:
|
|
cfg->fc_dst = nla_get_be32(attr);
|
|
break;
|
|
case RTA_OIF:
|
|
cfg->fc_oif = nla_get_u32(attr);
|
|
break;
|
|
case RTA_GATEWAY:
|
|
cfg->fc_gw = nla_get_be32(attr);
|
|
break;
|
|
case RTA_PRIORITY:
|
|
cfg->fc_priority = nla_get_u32(attr);
|
|
break;
|
|
case RTA_PREFSRC:
|
|
cfg->fc_prefsrc = nla_get_be32(attr);
|
|
break;
|
|
case RTA_METRICS:
|
|
cfg->fc_mx = nla_data(attr);
|
|
cfg->fc_mx_len = nla_len(attr);
|
|
break;
|
|
case RTA_MULTIPATH:
|
|
cfg->fc_mp = nla_data(attr);
|
|
cfg->fc_mp_len = nla_len(attr);
|
|
break;
|
|
case RTA_FLOW:
|
|
cfg->fc_flow = nla_get_u32(attr);
|
|
break;
|
|
case RTA_TABLE:
|
|
cfg->fc_table = nla_get_u32(attr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct net *net = skb->sk->sk_net;
|
|
struct fib_config cfg;
|
|
struct fib_table *tb;
|
|
int err;
|
|
|
|
err = rtm_to_fib_config(net, skb, nlh, &cfg);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
tb = fib_get_table(net, cfg.fc_table);
|
|
if (tb == NULL) {
|
|
err = -ESRCH;
|
|
goto errout;
|
|
}
|
|
|
|
err = tb->tb_delete(tb, &cfg);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct net *net = skb->sk->sk_net;
|
|
struct fib_config cfg;
|
|
struct fib_table *tb;
|
|
int err;
|
|
|
|
err = rtm_to_fib_config(net, skb, nlh, &cfg);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
tb = fib_new_table(net, cfg.fc_table);
|
|
if (tb == NULL) {
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
err = tb->tb_insert(tb, &cfg);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = skb->sk->sk_net;
|
|
unsigned int h, s_h;
|
|
unsigned int e = 0, s_e;
|
|
struct fib_table *tb;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
int dumped = 0;
|
|
|
|
if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
|
|
((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
|
|
return ip_rt_dump(skb, cb);
|
|
|
|
s_h = cb->args[0];
|
|
s_e = cb->args[1];
|
|
|
|
for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
|
|
e = 0;
|
|
head = &net->ipv4.fib_table_hash[h];
|
|
hlist_for_each_entry(tb, node, head, tb_hlist) {
|
|
if (e < s_e)
|
|
goto next;
|
|
if (dumped)
|
|
memset(&cb->args[2], 0, sizeof(cb->args) -
|
|
2 * sizeof(cb->args[0]));
|
|
if (tb->tb_dump(tb, skb, cb) < 0)
|
|
goto out;
|
|
dumped = 1;
|
|
next:
|
|
e++;
|
|
}
|
|
}
|
|
out:
|
|
cb->args[1] = e;
|
|
cb->args[0] = h;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
/* Prepare and feed intra-kernel routing request.
|
|
Really, it should be netlink message, but :-( netlink
|
|
can be not configured, so that we feed it directly
|
|
to fib engine. It is legal, because all events occur
|
|
only when netlink is already locked.
|
|
*/
|
|
|
|
static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
|
|
{
|
|
struct net *net = ifa->ifa_dev->dev->nd_net;
|
|
struct fib_table *tb;
|
|
struct fib_config cfg = {
|
|
.fc_protocol = RTPROT_KERNEL,
|
|
.fc_type = type,
|
|
.fc_dst = dst,
|
|
.fc_dst_len = dst_len,
|
|
.fc_prefsrc = ifa->ifa_local,
|
|
.fc_oif = ifa->ifa_dev->dev->ifindex,
|
|
.fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
|
|
.fc_nlinfo = {
|
|
.nl_net = net,
|
|
},
|
|
};
|
|
|
|
if (type == RTN_UNICAST)
|
|
tb = fib_new_table(net, RT_TABLE_MAIN);
|
|
else
|
|
tb = fib_new_table(net, RT_TABLE_LOCAL);
|
|
|
|
if (tb == NULL)
|
|
return;
|
|
|
|
cfg.fc_table = tb->tb_id;
|
|
|
|
if (type != RTN_LOCAL)
|
|
cfg.fc_scope = RT_SCOPE_LINK;
|
|
else
|
|
cfg.fc_scope = RT_SCOPE_HOST;
|
|
|
|
if (cmd == RTM_NEWROUTE)
|
|
tb->tb_insert(tb, &cfg);
|
|
else
|
|
tb->tb_delete(tb, &cfg);
|
|
}
|
|
|
|
void fib_add_ifaddr(struct in_ifaddr *ifa)
|
|
{
|
|
struct in_device *in_dev = ifa->ifa_dev;
|
|
struct net_device *dev = in_dev->dev;
|
|
struct in_ifaddr *prim = ifa;
|
|
__be32 mask = ifa->ifa_mask;
|
|
__be32 addr = ifa->ifa_local;
|
|
__be32 prefix = ifa->ifa_address&mask;
|
|
|
|
if (ifa->ifa_flags&IFA_F_SECONDARY) {
|
|
prim = inet_ifa_byprefix(in_dev, prefix, mask);
|
|
if (prim == NULL) {
|
|
printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
|
|
|
|
if (!(dev->flags&IFF_UP))
|
|
return;
|
|
|
|
/* Add broadcast address, if it is explicitly assigned. */
|
|
if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
|
|
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
|
|
|
|
if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
|
|
(prefix != addr || ifa->ifa_prefixlen < 32)) {
|
|
fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
|
|
RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim);
|
|
|
|
/* Add network specific broadcasts, when it takes a sense */
|
|
if (ifa->ifa_prefixlen < 31) {
|
|
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
|
|
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void fib_del_ifaddr(struct in_ifaddr *ifa)
|
|
{
|
|
struct in_device *in_dev = ifa->ifa_dev;
|
|
struct net_device *dev = in_dev->dev;
|
|
struct in_ifaddr *ifa1;
|
|
struct in_ifaddr *prim = ifa;
|
|
__be32 brd = ifa->ifa_address|~ifa->ifa_mask;
|
|
__be32 any = ifa->ifa_address&ifa->ifa_mask;
|
|
#define LOCAL_OK 1
|
|
#define BRD_OK 2
|
|
#define BRD0_OK 4
|
|
#define BRD1_OK 8
|
|
unsigned ok = 0;
|
|
|
|
if (!(ifa->ifa_flags&IFA_F_SECONDARY))
|
|
fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
|
|
RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
|
|
else {
|
|
prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
|
|
if (prim == NULL) {
|
|
printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Deletion is more complicated than add.
|
|
We should take care of not to delete too much :-)
|
|
|
|
Scan address list to be sure that addresses are really gone.
|
|
*/
|
|
|
|
for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
|
|
if (ifa->ifa_local == ifa1->ifa_local)
|
|
ok |= LOCAL_OK;
|
|
if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
|
|
ok |= BRD_OK;
|
|
if (brd == ifa1->ifa_broadcast)
|
|
ok |= BRD1_OK;
|
|
if (any == ifa1->ifa_broadcast)
|
|
ok |= BRD0_OK;
|
|
}
|
|
|
|
if (!(ok&BRD_OK))
|
|
fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
|
|
if (!(ok&BRD1_OK))
|
|
fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
|
|
if (!(ok&BRD0_OK))
|
|
fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
|
|
if (!(ok&LOCAL_OK)) {
|
|
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
|
|
|
|
/* Check, that this local address finally disappeared. */
|
|
if (inet_addr_type(dev->nd_net, ifa->ifa_local) != RTN_LOCAL) {
|
|
/* And the last, but not the least thing.
|
|
We must flush stray FIB entries.
|
|
|
|
First of all, we scan fib_info list searching
|
|
for stray nexthop entries, then ignite fib_flush.
|
|
*/
|
|
if (fib_sync_down_addr(dev->nd_net, ifa->ifa_local))
|
|
fib_flush(dev->nd_net);
|
|
}
|
|
}
|
|
#undef LOCAL_OK
|
|
#undef BRD_OK
|
|
#undef BRD0_OK
|
|
#undef BRD1_OK
|
|
}
|
|
|
|
static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
|
|
{
|
|
|
|
struct fib_result res;
|
|
struct flowi fl = { .mark = frn->fl_mark,
|
|
.nl_u = { .ip4_u = { .daddr = frn->fl_addr,
|
|
.tos = frn->fl_tos,
|
|
.scope = frn->fl_scope } } };
|
|
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
res.r = NULL;
|
|
#endif
|
|
|
|
frn->err = -ENOENT;
|
|
if (tb) {
|
|
local_bh_disable();
|
|
|
|
frn->tb_id = tb->tb_id;
|
|
frn->err = tb->tb_lookup(tb, &fl, &res);
|
|
|
|
if (!frn->err) {
|
|
frn->prefixlen = res.prefixlen;
|
|
frn->nh_sel = res.nh_sel;
|
|
frn->type = res.type;
|
|
frn->scope = res.scope;
|
|
fib_res_put(&res);
|
|
}
|
|
local_bh_enable();
|
|
}
|
|
}
|
|
|
|
static void nl_fib_input(struct sk_buff *skb)
|
|
{
|
|
struct net *net;
|
|
struct fib_result_nl *frn;
|
|
struct nlmsghdr *nlh;
|
|
struct fib_table *tb;
|
|
u32 pid;
|
|
|
|
net = skb->sk->sk_net;
|
|
nlh = nlmsg_hdr(skb);
|
|
if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
|
|
nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
|
|
return;
|
|
|
|
skb = skb_clone(skb, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
return;
|
|
nlh = nlmsg_hdr(skb);
|
|
|
|
frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
|
|
tb = fib_get_table(net, frn->tb_id_in);
|
|
|
|
nl_fib_lookup(frn, tb);
|
|
|
|
pid = NETLINK_CB(skb).pid; /* pid of sending process */
|
|
NETLINK_CB(skb).pid = 0; /* from kernel */
|
|
NETLINK_CB(skb).dst_group = 0; /* unicast */
|
|
netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT);
|
|
}
|
|
|
|
static int nl_fib_lookup_init(struct net *net)
|
|
{
|
|
struct sock *sk;
|
|
sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0,
|
|
nl_fib_input, NULL, THIS_MODULE);
|
|
if (sk == NULL)
|
|
return -EAFNOSUPPORT;
|
|
net->ipv4.fibnl = sk;
|
|
return 0;
|
|
}
|
|
|
|
static void nl_fib_lookup_exit(struct net *net)
|
|
{
|
|
netlink_kernel_release(net->ipv4.fibnl);
|
|
net->ipv4.fibnl = NULL;
|
|
}
|
|
|
|
static void fib_disable_ip(struct net_device *dev, int force)
|
|
{
|
|
if (fib_sync_down_dev(dev, force))
|
|
fib_flush(dev->nd_net);
|
|
rt_cache_flush(0);
|
|
arp_ifdown(dev);
|
|
}
|
|
|
|
static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct in_ifaddr *ifa = (struct in_ifaddr*)ptr;
|
|
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
fib_add_ifaddr(ifa);
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
fib_sync_up(ifa->ifa_dev->dev);
|
|
#endif
|
|
rt_cache_flush(-1);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
fib_del_ifaddr(ifa);
|
|
if (ifa->ifa_dev->ifa_list == NULL) {
|
|
/* Last address was deleted from this interface.
|
|
Disable IP.
|
|
*/
|
|
fib_disable_ip(ifa->ifa_dev->dev, 1);
|
|
} else {
|
|
rt_cache_flush(-1);
|
|
}
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
|
|
if (event == NETDEV_UNREGISTER) {
|
|
fib_disable_ip(dev, 2);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
if (!in_dev)
|
|
return NOTIFY_DONE;
|
|
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
for_ifa(in_dev) {
|
|
fib_add_ifaddr(ifa);
|
|
} endfor_ifa(in_dev);
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
fib_sync_up(dev);
|
|
#endif
|
|
rt_cache_flush(-1);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
fib_disable_ip(dev, 0);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
case NETDEV_CHANGE:
|
|
rt_cache_flush(0);
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block fib_inetaddr_notifier = {
|
|
.notifier_call =fib_inetaddr_event,
|
|
};
|
|
|
|
static struct notifier_block fib_netdev_notifier = {
|
|
.notifier_call =fib_netdev_event,
|
|
};
|
|
|
|
static int __net_init ip_fib_net_init(struct net *net)
|
|
{
|
|
int err;
|
|
unsigned int i;
|
|
|
|
net->ipv4.fib_table_hash = kzalloc(
|
|
sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL);
|
|
if (net->ipv4.fib_table_hash == NULL)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < FIB_TABLE_HASHSZ; i++)
|
|
INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]);
|
|
|
|
err = fib4_rules_init(net);
|
|
if (err < 0)
|
|
goto fail;
|
|
return 0;
|
|
|
|
fail:
|
|
kfree(net->ipv4.fib_table_hash);
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit ip_fib_net_exit(struct net *net)
|
|
{
|
|
unsigned int i;
|
|
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
fib4_rules_exit(net);
|
|
#endif
|
|
|
|
for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
|
|
struct fib_table *tb;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node, *tmp;
|
|
|
|
head = &net->ipv4.fib_table_hash[i];
|
|
hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) {
|
|
hlist_del(node);
|
|
tb->tb_flush(tb);
|
|
kfree(tb);
|
|
}
|
|
}
|
|
kfree(net->ipv4.fib_table_hash);
|
|
}
|
|
|
|
static int __net_init fib_net_init(struct net *net)
|
|
{
|
|
int error;
|
|
|
|
error = ip_fib_net_init(net);
|
|
if (error < 0)
|
|
goto out;
|
|
error = nl_fib_lookup_init(net);
|
|
if (error < 0)
|
|
goto out_nlfl;
|
|
error = fib_proc_init(net);
|
|
if (error < 0)
|
|
goto out_proc;
|
|
out:
|
|
return error;
|
|
|
|
out_proc:
|
|
nl_fib_lookup_exit(net);
|
|
out_nlfl:
|
|
ip_fib_net_exit(net);
|
|
goto out;
|
|
}
|
|
|
|
static void __net_exit fib_net_exit(struct net *net)
|
|
{
|
|
fib_proc_exit(net);
|
|
nl_fib_lookup_exit(net);
|
|
ip_fib_net_exit(net);
|
|
}
|
|
|
|
static struct pernet_operations fib_net_ops = {
|
|
.init = fib_net_init,
|
|
.exit = fib_net_exit,
|
|
};
|
|
|
|
void __init ip_fib_init(void)
|
|
{
|
|
rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
|
|
rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
|
|
rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
|
|
|
|
register_pernet_subsys(&fib_net_ops);
|
|
register_netdevice_notifier(&fib_netdev_notifier);
|
|
register_inetaddr_notifier(&fib_inetaddr_notifier);
|
|
|
|
fib_hash_init();
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet_addr_type);
|
|
EXPORT_SYMBOL(inet_dev_addr_type);
|
|
EXPORT_SYMBOL(ip_dev_find);
|