2005-04-17 05:20:36 +07:00
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/*
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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: policy rules.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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2010-10-05 03:00:18 +07:00
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* Thomas Graf <tgraf@suug.ch>
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2005-04-17 05:20:36 +07:00
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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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* Fixes:
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2010-10-05 03:00:18 +07:00
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* Rani Assaf : local_rule cannot be deleted
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2005-04-17 05:20:36 +07:00
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* Marc Boucher : routing by fwmark
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/netlink.h>
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2006-08-04 17:39:22 +07:00
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#include <linux/inetdevice.h>
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2005-04-17 05:20:36 +07:00
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#include <linux/init.h>
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2006-03-21 08:18:53 +07:00
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#include <linux/list.h>
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#include <linux/rcupdate.h>
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2011-07-15 22:47:34 +07:00
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#include <linux/export.h>
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2005-04-17 05:20:36 +07:00
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/tcp.h>
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#include <net/ip_fib.h>
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2006-08-04 17:39:22 +07:00
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#include <net/fib_rules.h>
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2005-04-17 05:20:36 +07:00
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2010-10-05 03:00:18 +07:00
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struct fib4_rule {
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2006-08-04 17:39:22 +07:00
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struct fib_rule common;
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u8 dst_len;
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u8 src_len;
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u8 tos;
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2006-09-28 08:40:00 +07:00
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__be32 src;
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__be32 srcmask;
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__be32 dst;
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__be32 dstmask;
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2011-01-14 19:36:42 +07:00
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#ifdef CONFIG_IP_ROUTE_CLASSID
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2006-08-04 17:39:22 +07:00
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u32 tclassid;
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2005-04-17 05:20:36 +07:00
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#endif
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};
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2012-07-06 12:13:13 +07:00
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int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
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2006-08-04 17:39:22 +07:00
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{
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struct fib_lookup_arg arg = {
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.result = res,
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2010-10-05 17:41:36 +07:00
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.flags = FIB_LOOKUP_NOREF,
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2006-08-04 17:39:22 +07:00
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};
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int err;
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2005-04-17 05:20:36 +07:00
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2011-03-12 07:54:08 +07:00
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err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
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2012-07-13 22:21:29 +07:00
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#ifdef CONFIG_IP_ROUTE_CLASSID
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if (arg.rule)
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res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
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else
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res->tclassid = 0;
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#endif
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2014-11-14 18:14:32 +07:00
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if (err == -ESRCH)
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err = -ENETUNREACH;
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2006-08-04 17:39:22 +07:00
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return err;
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}
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2012-07-06 12:13:13 +07:00
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EXPORT_SYMBOL_GPL(__fib_lookup);
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2006-08-04 17:39:22 +07:00
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2006-08-08 11:50:48 +07:00
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static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
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int flags, struct fib_lookup_arg *arg)
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2005-04-17 05:20:36 +07:00
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{
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2006-08-04 17:39:22 +07:00
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int err = -EAGAIN;
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struct fib_table *tbl;
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switch (rule->action) {
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case FR_ACT_TO_TBL:
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break;
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case FR_ACT_UNREACHABLE:
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2015-01-01 01:56:24 +07:00
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return -ENETUNREACH;
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2006-08-04 17:39:22 +07:00
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case FR_ACT_PROHIBIT:
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2015-01-01 01:56:24 +07:00
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return -EACCES;
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2006-08-04 17:39:22 +07:00
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case FR_ACT_BLACKHOLE:
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default:
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2015-01-01 01:56:24 +07:00
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return -EINVAL;
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2005-04-17 05:20:36 +07:00
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}
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2006-08-04 17:39:22 +07:00
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2015-01-01 01:56:24 +07:00
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rcu_read_lock();
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2010-10-05 03:00:18 +07:00
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tbl = fib_get_table(rule->fr_net, rule->table);
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2015-01-01 01:56:24 +07:00
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if (tbl)
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err = fib_table_lookup(tbl, &flp->u.ip4,
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(struct fib_result *)arg->result,
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arg->flags);
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2006-08-04 17:39:22 +07:00
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2015-01-01 01:56:24 +07:00
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rcu_read_unlock();
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2005-04-17 05:20:36 +07:00
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return err;
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}
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2013-08-01 07:17:15 +07:00
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static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
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{
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2013-08-02 22:19:56 +07:00
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struct fib_result *result = (struct fib_result *) arg->result;
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2013-12-11 05:21:25 +07:00
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struct net_device *dev = NULL;
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if (result->fi)
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dev = result->fi->fib_dev;
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2013-08-02 22:19:56 +07:00
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2013-08-01 07:17:15 +07:00
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/* do not accept result if the route does
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* not meet the required prefix length
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*/
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2013-08-03 19:14:43 +07:00
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if (result->prefixlen <= rule->suppress_prefixlen)
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2013-08-02 22:19:56 +07:00
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goto suppress_route;
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/* do not accept result if the route uses a device
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* belonging to a forbidden interface group
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*/
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if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
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goto suppress_route;
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2013-08-01 07:17:15 +07:00
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return false;
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2013-08-02 22:19:56 +07:00
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suppress_route:
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if (!(arg->flags & FIB_LOOKUP_NOREF))
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fib_info_put(result->fi);
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return true;
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2013-08-01 07:17:15 +07:00
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}
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2006-08-04 17:39:22 +07:00
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static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
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{
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struct fib4_rule *r = (struct fib4_rule *) rule;
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2011-03-12 14:02:42 +07:00
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struct flowi4 *fl4 = &fl->u.ip4;
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__be32 daddr = fl4->daddr;
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__be32 saddr = fl4->saddr;
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2006-08-04 17:39:22 +07:00
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if (((saddr ^ r->src) & r->srcmask) ||
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((daddr ^ r->dst) & r->dstmask))
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return 0;
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2011-03-12 14:02:42 +07:00
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if (r->tos && (r->tos != fl4->flowi4_tos))
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2006-08-04 17:39:22 +07:00
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return 0;
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return 1;
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}
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2005-04-17 05:20:36 +07:00
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2008-01-10 18:24:11 +07:00
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static struct fib_table *fib_empty_table(struct net *net)
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2005-04-17 05:20:36 +07:00
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{
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2006-08-11 13:08:33 +07:00
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u32 id;
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2005-04-17 05:20:36 +07:00
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for (id = 1; id <= RT_TABLE_MAX; id++)
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2015-04-03 15:17:26 +07:00
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if (!fib_get_table(net, id))
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2008-01-10 18:24:11 +07:00
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return fib_new_table(net, id);
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2005-04-17 05:20:36 +07:00
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return NULL;
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}
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2007-06-06 02:38:30 +07:00
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static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
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2006-11-10 06:22:48 +07:00
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FRA_GENERIC_POLICY,
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2006-08-04 17:39:22 +07:00
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[FRA_FLOW] = { .type = NLA_U32 },
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};
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2006-03-21 08:18:53 +07:00
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2006-08-04 17:39:22 +07:00
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static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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2009-05-11 12:52:49 +07:00
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struct fib_rule_hdr *frh,
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2006-08-04 17:39:22 +07:00
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struct nlattr **tb)
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2005-04-17 05:20:36 +07:00
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{
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2008-03-26 00:26:21 +07:00
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struct net *net = sock_net(skb->sk);
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2006-08-04 17:39:22 +07:00
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int err = -EINVAL;
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struct fib4_rule *rule4 = (struct fib4_rule *) rule;
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2005-04-17 05:20:36 +07:00
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2007-03-25 02:46:02 +07:00
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if (frh->tos & ~IPTOS_TOS_MASK)
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2006-08-04 17:39:22 +07:00
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goto errout;
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2006-03-21 08:18:53 +07:00
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2015-03-07 04:47:00 +07:00
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/* split local/main if they are not already split */
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err = fib_unmerge(net);
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if (err)
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goto errout;
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2006-08-04 17:39:22 +07:00
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if (rule->table == RT_TABLE_UNSPEC) {
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if (rule->action == FR_ACT_TO_TBL) {
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struct fib_table *table;
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2005-04-17 05:20:36 +07:00
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2008-01-10 18:27:51 +07:00
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table = fib_empty_table(net);
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2015-04-03 15:17:26 +07:00
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if (!table) {
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2006-08-04 17:39:22 +07:00
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err = -ENOBUFS;
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goto errout;
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}
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2005-04-17 05:20:36 +07:00
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2006-08-04 17:39:22 +07:00
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rule->table = table->tb_id;
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2005-04-17 05:20:36 +07:00
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}
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}
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2007-03-25 02:46:02 +07:00
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if (frh->src_len)
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2015-03-29 21:59:26 +07:00
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rule4->src = nla_get_in_addr(tb[FRA_SRC]);
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2006-03-21 08:18:53 +07:00
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2007-03-25 02:46:02 +07:00
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if (frh->dst_len)
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2015-03-29 21:59:26 +07:00
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rule4->dst = nla_get_in_addr(tb[FRA_DST]);
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2006-03-21 08:18:53 +07:00
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2011-01-14 19:36:42 +07:00
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#ifdef CONFIG_IP_ROUTE_CLASSID
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2012-06-29 15:32:45 +07:00
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if (tb[FRA_FLOW]) {
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2006-08-04 17:39:22 +07:00
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rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
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2012-06-29 15:32:45 +07:00
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if (rule4->tclassid)
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2012-07-06 12:13:13 +07:00
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net->ipv4.fib_num_tclassid_users++;
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2012-06-29 15:32:45 +07:00
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}
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2005-04-17 05:20:36 +07:00
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#endif
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2006-08-04 17:39:22 +07:00
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rule4->src_len = frh->src_len;
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rule4->srcmask = inet_make_mask(rule4->src_len);
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rule4->dst_len = frh->dst_len;
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rule4->dstmask = inet_make_mask(rule4->dst_len);
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rule4->tos = frh->tos;
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2006-03-21 08:18:53 +07:00
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2012-07-06 12:13:13 +07:00
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net->ipv4.fib_has_custom_rules = true;
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2015-03-06 12:21:16 +07:00
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fib_flush_external(rule->fr_net);
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2006-08-04 17:39:22 +07:00
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err = 0;
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errout:
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return err;
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2005-04-17 05:20:36 +07:00
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}
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2015-03-07 04:47:00 +07:00
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static int fib4_rule_delete(struct fib_rule *rule)
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2012-06-29 15:32:45 +07:00
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{
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2012-07-06 12:13:13 +07:00
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struct net *net = rule->fr_net;
|
2015-03-07 04:47:00 +07:00
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int err;
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2012-06-29 15:32:45 +07:00
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2015-03-07 04:47:00 +07:00
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/* split local/main if they are not already split */
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err = fib_unmerge(net);
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if (err)
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goto errout;
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#ifdef CONFIG_IP_ROUTE_CLASSID
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if (((struct fib4_rule *)rule)->tclassid)
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2012-07-06 12:13:13 +07:00
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net->ipv4.fib_num_tclassid_users--;
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2012-06-29 15:32:45 +07:00
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#endif
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2012-07-06 12:13:13 +07:00
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net->ipv4.fib_has_custom_rules = true;
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2015-03-06 12:21:16 +07:00
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fib_flush_external(rule->fr_net);
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2015-03-07 04:47:00 +07:00
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errout:
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return err;
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2012-06-29 15:32:45 +07:00
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}
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2006-08-04 17:39:22 +07:00
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static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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struct nlattr **tb)
|
2005-04-17 05:20:36 +07:00
|
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{
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2006-08-04 17:39:22 +07:00
|
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struct fib4_rule *rule4 = (struct fib4_rule *) rule;
|
2005-04-17 05:20:36 +07:00
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2006-08-04 17:39:22 +07:00
|
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if (frh->src_len && (rule4->src_len != frh->src_len))
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return 0;
|
2005-04-17 05:20:36 +07:00
|
|
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|
2006-08-04 17:39:22 +07:00
|
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if (frh->dst_len && (rule4->dst_len != frh->dst_len))
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return 0;
|
2006-03-21 08:18:53 +07:00
|
|
|
|
2006-08-04 17:39:22 +07:00
|
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if (frh->tos && (rule4->tos != frh->tos))
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return 0;
|
2006-03-21 08:18:53 +07:00
|
|
|
|
2011-01-14 19:36:42 +07:00
|
|
|
#ifdef CONFIG_IP_ROUTE_CLASSID
|
2006-08-04 17:39:22 +07:00
|
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|
if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
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return 0;
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|
#endif
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2015-03-29 21:59:26 +07:00
|
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|
if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC])))
|
2006-08-04 17:39:22 +07:00
|
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|
return 0;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2015-03-29 21:59:26 +07:00
|
|
|
if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST])))
|
2006-08-04 17:39:22 +07:00
|
|
|
return 0;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2006-08-04 17:39:22 +07:00
|
|
|
return 1;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
2006-08-04 17:39:22 +07:00
|
|
|
static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
|
2009-05-21 07:26:23 +07:00
|
|
|
struct fib_rule_hdr *frh)
|
2006-08-04 17:39:22 +07:00
|
|
|
{
|
|
|
|
struct fib4_rule *rule4 = (struct fib4_rule *) rule;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2006-08-04 17:39:22 +07:00
|
|
|
frh->dst_len = rule4->dst_len;
|
|
|
|
frh->src_len = rule4->src_len;
|
|
|
|
frh->tos = rule4->tos;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2012-04-02 07:39:02 +07:00
|
|
|
if ((rule4->dst_len &&
|
2015-03-29 21:59:25 +07:00
|
|
|
nla_put_in_addr(skb, FRA_DST, rule4->dst)) ||
|
2012-04-02 07:39:02 +07:00
|
|
|
(rule4->src_len &&
|
2015-03-29 21:59:25 +07:00
|
|
|
nla_put_in_addr(skb, FRA_SRC, rule4->src)))
|
2012-04-02 07:39:02 +07:00
|
|
|
goto nla_put_failure;
|
2011-01-14 19:36:42 +07:00
|
|
|
#ifdef CONFIG_IP_ROUTE_CLASSID
|
2012-04-02 07:39:02 +07:00
|
|
|
if (rule4->tclassid &&
|
|
|
|
nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
|
|
|
|
goto nla_put_failure;
|
2005-04-17 05:20:36 +07:00
|
|
|
#endif
|
2006-08-04 17:39:22 +07:00
|
|
|
return 0;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2006-08-04 17:39:22 +07:00
|
|
|
nla_put_failure:
|
|
|
|
return -ENOBUFS;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
2006-11-11 05:10:15 +07:00
|
|
|
static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
|
|
|
|
{
|
|
|
|
return nla_total_size(4) /* dst */
|
|
|
|
+ nla_total_size(4) /* src */
|
|
|
|
+ nla_total_size(4); /* flow */
|
|
|
|
}
|
|
|
|
|
2008-07-06 09:01:28 +07:00
|
|
|
static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
|
2007-03-28 03:56:52 +07:00
|
|
|
{
|
2012-09-07 07:45:29 +07:00
|
|
|
rt_cache_flush(ops->fro_net);
|
2007-03-28 03:56:52 +07:00
|
|
|
}
|
|
|
|
|
2012-10-05 07:12:11 +07:00
|
|
|
static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
|
2010-04-26 21:02:05 +07:00
|
|
|
.family = AF_INET,
|
2006-08-04 17:39:22 +07:00
|
|
|
.rule_size = sizeof(struct fib4_rule),
|
2007-03-25 02:46:02 +07:00
|
|
|
.addr_size = sizeof(u32),
|
2006-08-04 17:39:22 +07:00
|
|
|
.action = fib4_rule_action,
|
2013-08-01 07:17:15 +07:00
|
|
|
.suppress = fib4_rule_suppress,
|
2006-08-04 17:39:22 +07:00
|
|
|
.match = fib4_rule_match,
|
|
|
|
.configure = fib4_rule_configure,
|
2012-06-29 15:32:45 +07:00
|
|
|
.delete = fib4_rule_delete,
|
2006-08-04 17:39:22 +07:00
|
|
|
.compare = fib4_rule_compare,
|
|
|
|
.fill = fib4_rule_fill,
|
2010-04-13 12:03:15 +07:00
|
|
|
.default_pref = fib_default_rule_pref,
|
2006-11-11 05:10:15 +07:00
|
|
|
.nlmsg_payload = fib4_rule_nlmsg_payload,
|
2007-03-28 03:56:52 +07:00
|
|
|
.flush_cache = fib4_rule_flush_cache,
|
2006-08-04 17:39:22 +07:00
|
|
|
.nlgroup = RTNLGRP_IPV4_RULE,
|
|
|
|
.policy = fib4_rule_policy,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
2008-01-10 18:27:51 +07:00
|
|
|
static int fib_default_rules_init(struct fib_rules_ops *ops)
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2007-11-11 13:12:03 +07:00
|
|
|
int err;
|
|
|
|
|
2009-12-03 08:25:57 +07:00
|
|
|
err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
|
2007-11-11 13:12:03 +07:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
2008-01-10 18:27:51 +07:00
|
|
|
err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
|
2007-11-11 13:12:03 +07:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
2008-01-10 18:27:51 +07:00
|
|
|
err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
|
2007-11-11 13:12:03 +07:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2008-01-10 18:22:17 +07:00
|
|
|
int __net_init fib4_rules_init(struct net *net)
|
2007-11-11 13:12:03 +07:00
|
|
|
{
|
2008-01-10 18:21:49 +07:00
|
|
|
int err;
|
2008-01-10 18:27:51 +07:00
|
|
|
struct fib_rules_ops *ops;
|
|
|
|
|
2009-12-04 03:22:55 +07:00
|
|
|
ops = fib_rules_register(&fib4_rules_ops_template, net);
|
|
|
|
if (IS_ERR(ops))
|
|
|
|
return PTR_ERR(ops);
|
2008-01-10 18:21:49 +07:00
|
|
|
|
2008-01-10 18:27:51 +07:00
|
|
|
err = fib_default_rules_init(ops);
|
2008-01-10 18:21:49 +07:00
|
|
|
if (err < 0)
|
|
|
|
goto fail;
|
2008-01-10 18:27:51 +07:00
|
|
|
net->ipv4.rules_ops = ops;
|
2012-07-06 12:13:13 +07:00
|
|
|
net->ipv4.fib_has_custom_rules = false;
|
2008-01-10 18:21:49 +07:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
/* also cleans all rules already added */
|
2008-01-21 07:46:41 +07:00
|
|
|
fib_rules_unregister(ops);
|
2008-01-10 18:21:49 +07:00
|
|
|
return err;
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
2008-01-10 18:22:17 +07:00
|
|
|
|
|
|
|
void __net_exit fib4_rules_exit(struct net *net)
|
|
|
|
{
|
2008-01-21 07:46:41 +07:00
|
|
|
fib_rules_unregister(net->ipv4.rules_ops);
|
2008-01-10 18:22:17 +07:00
|
|
|
}
|