/*
* 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 1.21 1999/12/15 22:39:07 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/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.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/netdevice.h>
#include <linux/if_arp.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/init.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>
#define FFprint(a...) printk(KERN_DEBUG a)
#ifndef CONFIG_IP_MULTIPLE_TABLES
#define RT_TABLE_MIN RT_TABLE_MAIN
struct fib_table *local_table;
struct fib_table *main_table;
#else
#define RT_TABLE_MIN 1
struct fib_table *fib_tables[RT_TABLE_MAX+1];
struct fib_table *__fib_new_table(int id)
{
struct fib_table *tb;
tb = fib_hash_init(id);
if (!tb)
return NULL;
fib_tables[id] = tb;
return tb;
}
#endif /* CONFIG_IP_MULTIPLE_TABLES */
78 void fib_flush(void)
{
int flushed = 0;
#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_table *tb;
int id;
for (id = RT_TABLE_MAX; id>0; id--) {
if ((tb = fib_get_table(id))==NULL)
continue;
flushed += tb->tb_flush(tb);
}
#else /* CONFIG_IP_MULTIPLE_TABLES */
flushed += main_table->tb_flush(main_table);
flushed += local_table->tb_flush(local_table);
#endif /* CONFIG_IP_MULTIPLE_TABLES */
95 if (flushed)
rt_cache_flush(-1);
}
#ifdef CONFIG_PROC_FS
/*
* Called from the PROCfs module. This outputs /proc/net/route.
*
* It always works in backward compatibility mode.
* The format of the file is not supposed to be changed.
*/
static int
110 fib_get_procinfo(char *buffer, char **start, off_t offset, int length)
{
int first = offset/128;
char *ptr = buffer;
int count = (length+127)/128;
int len;
*start = buffer + offset%128;
119 if (--first < 0) {
sprintf(buffer, "%-127s\n", "Iface\tDestination\tGateway \tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU\tWindow\tIRTT");
--count;
ptr += 128;
first = 0;
}
126 if (main_table && count > 0) {
int n = main_table->tb_get_info(main_table, ptr, first, count);
count -= n;
ptr += n*128;
}
len = ptr - *start;
132 if (len >= length)
133 return length;
134 if (len >= 0)
135 return len;
136 return 0;
}
#endif /* CONFIG_PROC_FS */
/*
* Find the first device with a given source address.
*/
145 struct net_device * ip_dev_find(u32 addr)
{
struct rt_key key;
struct fib_result res;
struct net_device *dev = NULL;
memset(&key, 0, sizeof(key));
key.dst = addr;
#ifdef CONFIG_IP_MULTIPLE_TABLES
res.r = NULL;
#endif
157 if (!local_table || local_table->tb_lookup(local_table, &key, &res)) {
158 return NULL;
}
160 if (res.type != RTN_LOCAL)
161 goto out;
dev = FIB_RES_DEV(res);
163 if (dev)
atomic_inc(&dev->refcnt);
out:
fib_res_put(&res);
168 return dev;
}
171 unsigned inet_addr_type(u32 addr)
{
struct rt_key key;
struct fib_result res;
unsigned ret = RTN_BROADCAST;
177 if (ZERONET(addr) || BADCLASS(addr))
178 return RTN_BROADCAST;
179 if (MULTICAST(addr))
180 return RTN_MULTICAST;
memset(&key, 0, sizeof(key));
key.dst = addr;
#ifdef CONFIG_IP_MULTIPLE_TABLES
res.r = NULL;
#endif
188 if (local_table) {
ret = RTN_UNICAST;
190 if (local_table->tb_lookup(local_table, &key, &res) == 0) {
ret = res.type;
fib_res_put(&res);
}
}
195 return ret;
}
/* 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.
*/
206 int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
struct net_device *dev, u32 *spec_dst, u32 *itag)
{
struct in_device *in_dev;
struct rt_key key;
struct fib_result res;
int no_addr, rpf;
int ret;
key.dst = src;
key.src = dst;
key.tos = tos;
key.oif = 0;
key.iif = oif;
key.scope = RT_SCOPE_UNIVERSE;
no_addr = rpf = 0;
read_lock(&inetdev_lock);
in_dev = __in_dev_get(dev);
225 if (in_dev) {
no_addr = in_dev->ifa_list == NULL;
rpf = IN_DEV_RPFILTER(in_dev);
}
229 read_unlock(&inetdev_lock);
231 if (in_dev == NULL)
232 goto e_inval;
234 if (fib_lookup(&key, &res))
235 goto last_resort;
236 if (res.type != RTN_UNICAST)
237 goto e_inval_res;
*spec_dst = FIB_RES_PREFSRC(res);
239 if (itag)
fib_combine_itag(itag, &res);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
#else
244 if (FIB_RES_DEV(res) == dev)
#endif
{
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
fib_res_put(&res);
249 return ret;
}
fib_res_put(&res);
252 if (no_addr)
253 goto last_resort;
254 if (rpf)
255 goto e_inval;
key.oif = dev->ifindex;
ret = 0;
259 if (fib_lookup(&key, &res) == 0) {
260 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);
}
266 return ret;
last_resort:
269 if (rpf)
270 goto e_inval;
*spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
*itag = 0;
273 return 0;
e_inval_res:
fib_res_put(&res);
e_inval:
278 return -EINVAL;
}
#ifndef CONFIG_IP_NOSIOCRT
/*
* Handle IP routing ioctl calls. These are used to manipulate the routing tables
*/
287 int ip_rt_ioctl(unsigned int cmd, void *arg)
{
int err;
struct kern_rta rta;
struct rtentry r;
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
} req;
297 switch (cmd) {
298 case SIOCADDRT: /* Add a route */
299 case SIOCDELRT: /* Delete a route */
300 if (!capable(CAP_NET_ADMIN))
301 return -EPERM;
302 if (copy_from_user(&r, arg, sizeof(struct rtentry)))
303 return -EFAULT;
rtnl_lock();
err = fib_convert_rtentry(cmd, &req.nlh, &req.rtm, &rta, &r);
306 if (err == 0) {
307 if (cmd == SIOCDELRT) {
struct fib_table *tb = fib_get_table(req.rtm.rtm_table);
err = -ESRCH;
310 if (tb)
err = tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL);
312 } else {
struct fib_table *tb = fib_new_table(req.rtm.rtm_table);
err = -ENOBUFS;
315 if (tb)
err = tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL);
}
318 if (rta.rta_mx)
kfree(rta.rta_mx);
}
rtnl_unlock();
322 return err;
}
324 return -EINVAL;
}
#else
int ip_rt_ioctl(unsigned int cmd, void *arg)
{
return -EINVAL;
}
#endif
#ifdef CONFIG_RTNETLINK
static int inet_check_attr(struct rtmsg *r, struct rtattr **rta)
{
int i;
for (i=1; i<=RTA_MAX; i++) {
struct rtattr *attr = rta[i-1];
if (attr) {
if (RTA_PAYLOAD(attr) < 4)
return -EINVAL;
if (i != RTA_MULTIPATH && i != RTA_METRICS)
rta[i-1] = (struct rtattr*)RTA_DATA(attr);
}
}
return 0;
}
int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
struct fib_table * tb;
struct rtattr **rta = arg;
struct rtmsg *r = NLMSG_DATA(nlh);
if (inet_check_attr(r, rta))
return -EINVAL;
tb = fib_get_table(r->rtm_table);
if (tb)
return tb->tb_delete(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb));
return -ESRCH;
}
int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
struct fib_table * tb;
struct rtattr **rta = arg;
struct rtmsg *r = NLMSG_DATA(nlh);
if (inet_check_attr(r, rta))
return -EINVAL;
tb = fib_new_table(r->rtm_table);
if (tb)
return tb->tb_insert(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb));
return -ENOBUFS;
}
int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
{
int t;
int s_t;
struct fib_table *tb;
if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
((struct rtmsg*)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
return ip_rt_dump(skb, cb);
s_t = cb->args[0];
if (s_t == 0)
s_t = cb->args[0] = RT_TABLE_MIN;
for (t=s_t; t<=RT_TABLE_MAX; t++) {
if (t < s_t) continue;
if (t > s_t)
memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
if ((tb = fib_get_table(t))==NULL)
continue;
if (tb->tb_dump(tb, skb, cb) < 0)
break;
}
cb->args[0] = t;
return skb->len;
}
#endif
/* 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.
*/
422 static void fib_magic(int cmd, int type, u32 dst, int dst_len, struct in_ifaddr *ifa)
{
struct fib_table * tb;
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
} req;
struct kern_rta rta;
memset(&req.rtm, 0, sizeof(req.rtm));
memset(&rta, 0, sizeof(rta));
434 if (type == RTN_UNICAST)
tb = fib_new_table(RT_TABLE_MAIN);
436 else
tb = fib_new_table(RT_TABLE_LOCAL);
439 if (tb == NULL)
440 return;
req.nlh.nlmsg_len = sizeof(req);
req.nlh.nlmsg_type = cmd;
req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
req.nlh.nlmsg_pid = 0;
req.nlh.nlmsg_seq = 0;
req.rtm.rtm_dst_len = dst_len;
req.rtm.rtm_table = tb->tb_id;
req.rtm.rtm_protocol = RTPROT_KERNEL;
req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
req.rtm.rtm_type = type;
rta.rta_dst = &dst;
rta.rta_prefsrc = &ifa->ifa_local;
rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
458 if (cmd == RTM_NEWROUTE)
tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL);
460 else
tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL);
}
464 static 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;
u32 mask = ifa->ifa_mask;
u32 addr = ifa->ifa_local;
u32 prefix = ifa->ifa_address&mask;
473 if (ifa->ifa_flags&IFA_F_SECONDARY) {
prim = inet_ifa_byprefix(in_dev, prefix, mask);
475 if (prim == NULL) {
printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n");
477 return;
}
}
fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
483 if (!(dev->flags&IFF_UP))
484 return;
/* Add broadcast address, if it is explicitly assigned. */
487 if (ifa->ifa_broadcast && ifa->ifa_broadcast != 0xFFFFFFFF)
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
491 (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 */
496 if (ifa->ifa_prefixlen < 31) {
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
}
}
}
503 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;
u32 brd = ifa->ifa_address|~ifa->ifa_mask;
u32 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;
517 if (!(ifa->ifa_flags&IFA_F_SECONDARY))
fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
520 else {
prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
522 if (prim == NULL) {
printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n");
524 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.
*/
534 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
535 if (ifa->ifa_local == ifa1->ifa_local)
ok |= LOCAL_OK;
537 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
ok |= BRD_OK;
539 if (brd == ifa1->ifa_broadcast)
ok |= BRD1_OK;
541 if (any == ifa1->ifa_broadcast)
ok |= BRD0_OK;
}
545 if (!(ok&BRD_OK))
fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
547 if (!(ok&BRD1_OK))
fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
549 if (!(ok&BRD0_OK))
fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
551 if (!(ok&LOCAL_OK)) {
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
/* Check, that this local address finally disappeared. */
555 if (inet_addr_type(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.
*/
562 if (fib_sync_down(ifa->ifa_local, NULL, 0))
fib_flush();
}
}
#undef LOCAL_OK
#undef BRD_OK
#undef BRD0_OK
#undef BRD1_OK
}
572 static void fib_disable_ip(struct net_device *dev, int force)
{
574 if (fib_sync_down(0, dev, force))
fib_flush();
rt_cache_flush(0);
arp_ifdown(dev);
}
580 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct in_ifaddr *ifa = (struct in_ifaddr*)ptr;
584 switch (event) {
585 case NETDEV_UP:
fib_add_ifaddr(ifa);
rt_cache_flush(-1);
588 break;
589 case NETDEV_DOWN:
590 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
/* Last address was deleted from this interface.
Disable IP.
*/
fib_disable_ip(ifa->ifa_dev->dev, 1);
595 } else {
fib_del_ifaddr(ifa);
rt_cache_flush(-1);
}
599 break;
}
601 return NOTIFY_DONE;
}
604 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(dev);
609 if (!in_dev)
610 return NOTIFY_DONE;
612 switch (event) {
613 case NETDEV_UP:
614 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);
621 break;
622 case NETDEV_DOWN:
fib_disable_ip(dev, 0);
624 break;
625 case NETDEV_UNREGISTER:
fib_disable_ip(dev, 1);
627 break;
628 case NETDEV_CHANGEMTU:
629 case NETDEV_CHANGE:
rt_cache_flush(0);
631 break;
}
633 return NOTIFY_DONE;
}
struct notifier_block fib_inetaddr_notifier = {
fib_inetaddr_event,
NULL,
0
};
struct notifier_block fib_netdev_notifier = {
fib_netdev_event,
NULL,
0
};
648 void __init ip_fib_init(void)
{
#ifdef CONFIG_PROC_FS
proc_net_create("route",0,fib_get_procinfo);
#endif /* CONFIG_PROC_FS */
#ifndef CONFIG_IP_MULTIPLE_TABLES
local_table = fib_hash_init(RT_TABLE_LOCAL);
main_table = fib_hash_init(RT_TABLE_MAIN);
#else
fib_rules_init();
#endif
register_netdevice_notifier(&fib_netdev_notifier);
register_inetaddr_notifier(&fib_inetaddr_notifier);
}