612 lines
14 KiB
C
612 lines
14 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* IPv4 Forwarding Information Base: FIB frontend.
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*
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* Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/errno.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/init.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/route.h>
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#include <net/tcp.h>
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#include <net/sock.h>
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#include <net/icmp.h>
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#include <net/arp.h>
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#include <net/ip_fib.h>
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#define FFprint(a...) printk(KERN_DEBUG a)
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#ifndef CONFIG_IP_MULTIPLE_TABLES
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#define RT_TABLE_MIN RT_TABLE_MAIN
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struct fib_table *ip_fib_local_table;
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struct fib_table *ip_fib_main_table;
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#else
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#define RT_TABLE_MIN 1
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struct fib_table *fib_tables[RT_TABLE_MAX+1];
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struct fib_table *__fib_new_table(int id)
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{
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struct fib_table *tb;
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tb = fib_hash_init(id);
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if (!tb)
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return NULL;
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fib_tables[id] = tb;
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return tb;
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}
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#endif /* CONFIG_IP_MULTIPLE_TABLES */
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static void fib_flush(void)
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{
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int flushed = 0;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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struct fib_table *tb;
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int id;
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for (id = RT_TABLE_MAX; id>0; id--) {
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if ((tb = fib_get_table(id))==NULL)
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continue;
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flushed += tb->tb_flush(tb);
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}
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#else /* CONFIG_IP_MULTIPLE_TABLES */
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flushed += ip_fib_main_table->tb_flush(ip_fib_main_table);
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flushed += ip_fib_local_table->tb_flush(ip_fib_local_table);
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#endif /* CONFIG_IP_MULTIPLE_TABLES */
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if (flushed)
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rt_cache_flush(-1);
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}
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/*
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* Find the first device with a given source address.
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*/
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struct net_device * ip_dev_find(u32 addr)
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{
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struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
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struct fib_result res;
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struct net_device *dev = NULL;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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res.r = NULL;
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#endif
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if (!ip_fib_local_table ||
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ip_fib_local_table->tb_lookup(ip_fib_local_table, &fl, &res))
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return NULL;
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if (res.type != RTN_LOCAL)
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goto out;
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dev = FIB_RES_DEV(res);
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if (dev)
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dev_hold(dev);
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out:
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fib_res_put(&res);
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return dev;
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}
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unsigned inet_addr_type(u32 addr)
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{
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struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
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struct fib_result res;
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unsigned ret = RTN_BROADCAST;
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if (ZERONET(addr) || BADCLASS(addr))
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return RTN_BROADCAST;
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if (MULTICAST(addr))
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return RTN_MULTICAST;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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res.r = NULL;
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#endif
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if (ip_fib_local_table) {
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ret = RTN_UNICAST;
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if (!ip_fib_local_table->tb_lookup(ip_fib_local_table,
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&fl, &res)) {
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ret = res.type;
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fib_res_put(&res);
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}
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}
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return ret;
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}
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/* Given (packet source, input interface) and optional (dst, oif, tos):
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- (main) check, that source is valid i.e. not broadcast or our local
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address.
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- figure out what "logical" interface this packet arrived
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and calculate "specific destination" address.
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- check, that packet arrived from expected physical interface.
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*/
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int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
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struct net_device *dev, u32 *spec_dst, u32 *itag)
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{
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struct in_device *in_dev;
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struct flowi fl = { .nl_u = { .ip4_u =
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{ .daddr = src,
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.saddr = dst,
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.tos = tos } },
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.iif = oif };
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struct fib_result res;
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int no_addr, rpf;
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int ret;
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no_addr = rpf = 0;
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rcu_read_lock();
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in_dev = __in_dev_get(dev);
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if (in_dev) {
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no_addr = in_dev->ifa_list == NULL;
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rpf = IN_DEV_RPFILTER(in_dev);
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}
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rcu_read_unlock();
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if (in_dev == NULL)
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goto e_inval;
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if (fib_lookup(&fl, &res))
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goto last_resort;
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if (res.type != RTN_UNICAST)
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goto e_inval_res;
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*spec_dst = FIB_RES_PREFSRC(res);
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fib_combine_itag(itag, &res);
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
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#else
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if (FIB_RES_DEV(res) == dev)
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#endif
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{
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ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
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fib_res_put(&res);
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return ret;
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}
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fib_res_put(&res);
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if (no_addr)
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goto last_resort;
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if (rpf)
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goto e_inval;
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fl.oif = dev->ifindex;
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ret = 0;
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if (fib_lookup(&fl, &res) == 0) {
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if (res.type == RTN_UNICAST) {
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*spec_dst = FIB_RES_PREFSRC(res);
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ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
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}
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fib_res_put(&res);
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}
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return ret;
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last_resort:
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if (rpf)
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goto e_inval;
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*spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
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*itag = 0;
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return 0;
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e_inval_res:
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fib_res_put(&res);
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e_inval:
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return -EINVAL;
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}
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#ifndef CONFIG_IP_NOSIOCRT
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/*
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* Handle IP routing ioctl calls. These are used to manipulate the routing tables
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*/
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int ip_rt_ioctl(unsigned int cmd, void __user *arg)
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{
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int err;
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struct kern_rta rta;
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struct rtentry r;
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struct {
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struct nlmsghdr nlh;
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struct rtmsg rtm;
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} req;
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switch (cmd) {
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case SIOCADDRT: /* Add a route */
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case SIOCDELRT: /* Delete a route */
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (copy_from_user(&r, arg, sizeof(struct rtentry)))
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return -EFAULT;
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rtnl_lock();
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err = fib_convert_rtentry(cmd, &req.nlh, &req.rtm, &rta, &r);
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if (err == 0) {
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if (cmd == SIOCDELRT) {
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struct fib_table *tb = fib_get_table(req.rtm.rtm_table);
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err = -ESRCH;
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if (tb)
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err = tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL);
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} else {
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struct fib_table *tb = fib_new_table(req.rtm.rtm_table);
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err = -ENOBUFS;
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if (tb)
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err = tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL);
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}
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if (rta.rta_mx)
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kfree(rta.rta_mx);
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}
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rtnl_unlock();
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return err;
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}
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return -EINVAL;
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}
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#else
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int ip_rt_ioctl(unsigned int cmd, void *arg)
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{
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return -EINVAL;
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}
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#endif
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static int inet_check_attr(struct rtmsg *r, struct rtattr **rta)
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{
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int i;
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for (i=1; i<=RTA_MAX; i++) {
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struct rtattr *attr = rta[i-1];
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if (attr) {
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if (RTA_PAYLOAD(attr) < 4)
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return -EINVAL;
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if (i != RTA_MULTIPATH && i != RTA_METRICS)
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rta[i-1] = (struct rtattr*)RTA_DATA(attr);
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}
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}
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return 0;
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}
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int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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{
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struct fib_table * tb;
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struct rtattr **rta = arg;
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struct rtmsg *r = NLMSG_DATA(nlh);
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if (inet_check_attr(r, rta))
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return -EINVAL;
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tb = fib_get_table(r->rtm_table);
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if (tb)
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return tb->tb_delete(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb));
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return -ESRCH;
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}
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int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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{
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struct fib_table * tb;
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struct rtattr **rta = arg;
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struct rtmsg *r = NLMSG_DATA(nlh);
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if (inet_check_attr(r, rta))
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return -EINVAL;
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tb = fib_new_table(r->rtm_table);
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if (tb)
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return tb->tb_insert(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb));
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return -ENOBUFS;
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}
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int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int t;
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int s_t;
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struct fib_table *tb;
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if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
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((struct rtmsg*)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
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return ip_rt_dump(skb, cb);
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s_t = cb->args[0];
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if (s_t == 0)
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s_t = cb->args[0] = RT_TABLE_MIN;
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for (t=s_t; t<=RT_TABLE_MAX; t++) {
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if (t < s_t) continue;
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if (t > s_t)
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memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
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if ((tb = fib_get_table(t))==NULL)
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continue;
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if (tb->tb_dump(tb, skb, cb) < 0)
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break;
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}
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cb->args[0] = t;
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return skb->len;
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}
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/* Prepare and feed intra-kernel routing request.
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Really, it should be netlink message, but :-( netlink
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can be not configured, so that we feed it directly
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to fib engine. It is legal, because all events occur
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only when netlink is already locked.
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*/
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static void fib_magic(int cmd, int type, u32 dst, int dst_len, struct in_ifaddr *ifa)
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{
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struct fib_table * tb;
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struct {
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struct nlmsghdr nlh;
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struct rtmsg rtm;
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} req;
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struct kern_rta rta;
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memset(&req.rtm, 0, sizeof(req.rtm));
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memset(&rta, 0, sizeof(rta));
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if (type == RTN_UNICAST)
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tb = fib_new_table(RT_TABLE_MAIN);
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else
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tb = fib_new_table(RT_TABLE_LOCAL);
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if (tb == NULL)
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return;
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req.nlh.nlmsg_len = sizeof(req);
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req.nlh.nlmsg_type = cmd;
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req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
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req.nlh.nlmsg_pid = 0;
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req.nlh.nlmsg_seq = 0;
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req.rtm.rtm_dst_len = dst_len;
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req.rtm.rtm_table = tb->tb_id;
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req.rtm.rtm_protocol = RTPROT_KERNEL;
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req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
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req.rtm.rtm_type = type;
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rta.rta_dst = &dst;
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rta.rta_prefsrc = &ifa->ifa_local;
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rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
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if (cmd == RTM_NEWROUTE)
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tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL);
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else
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tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL);
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}
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static void fib_add_ifaddr(struct in_ifaddr *ifa)
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{
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struct in_device *in_dev = ifa->ifa_dev;
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struct net_device *dev = in_dev->dev;
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struct in_ifaddr *prim = ifa;
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u32 mask = ifa->ifa_mask;
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u32 addr = ifa->ifa_local;
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u32 prefix = ifa->ifa_address&mask;
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if (ifa->ifa_flags&IFA_F_SECONDARY) {
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prim = inet_ifa_byprefix(in_dev, prefix, mask);
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if (prim == NULL) {
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printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n");
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return;
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}
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}
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fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
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if (!(dev->flags&IFF_UP))
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return;
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/* Add broadcast address, if it is explicitly assigned. */
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if (ifa->ifa_broadcast && ifa->ifa_broadcast != 0xFFFFFFFF)
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fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
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if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
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(prefix != addr || ifa->ifa_prefixlen < 32)) {
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fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
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RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim);
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/* Add network specific broadcasts, when it takes a sense */
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if (ifa->ifa_prefixlen < 31) {
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fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
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fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
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}
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}
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}
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static void fib_del_ifaddr(struct in_ifaddr *ifa)
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{
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struct in_device *in_dev = ifa->ifa_dev;
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struct net_device *dev = in_dev->dev;
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struct in_ifaddr *ifa1;
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struct in_ifaddr *prim = ifa;
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u32 brd = ifa->ifa_address|~ifa->ifa_mask;
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u32 any = ifa->ifa_address&ifa->ifa_mask;
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#define LOCAL_OK 1
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#define BRD_OK 2
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#define BRD0_OK 4
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#define BRD1_OK 8
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unsigned ok = 0;
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if (!(ifa->ifa_flags&IFA_F_SECONDARY))
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fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
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RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
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else {
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prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
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if (prim == NULL) {
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printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n");
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return;
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}
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}
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/* Deletion is more complicated than add.
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We should take care of not to delete too much :-)
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Scan address list to be sure that addresses are really gone.
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*/
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for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
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if (ifa->ifa_local == ifa1->ifa_local)
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ok |= LOCAL_OK;
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if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
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ok |= BRD_OK;
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if (brd == ifa1->ifa_broadcast)
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ok |= BRD1_OK;
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if (any == ifa1->ifa_broadcast)
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ok |= BRD0_OK;
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}
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if (!(ok&BRD_OK))
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fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
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if (!(ok&BRD1_OK))
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fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
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if (!(ok&BRD0_OK))
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fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
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if (!(ok&LOCAL_OK)) {
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fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
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/* Check, that this local address finally disappeared. */
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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.
|
|
*/
|
|
if (fib_sync_down(ifa->ifa_local, NULL, 0))
|
|
fib_flush();
|
|
}
|
|
}
|
|
#undef LOCAL_OK
|
|
#undef BRD_OK
|
|
#undef BRD0_OK
|
|
#undef BRD1_OK
|
|
}
|
|
|
|
static void fib_disable_ip(struct net_device *dev, int force)
|
|
{
|
|
if (fib_sync_down(0, dev, force))
|
|
fib_flush();
|
|
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->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(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,
|
|
};
|
|
|
|
void __init ip_fib_init(void)
|
|
{
|
|
#ifndef CONFIG_IP_MULTIPLE_TABLES
|
|
ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL);
|
|
ip_fib_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);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet_addr_type);
|
|
EXPORT_SYMBOL(ip_dev_find);
|
|
EXPORT_SYMBOL(ip_rt_ioctl);
|