Commit 101367c2 authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller
Browse files

[IPV6]: Policy Routing Rules



Adds support for policy routing rules including a new
local table for routes with a local destination.
Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 14c0b97d
......@@ -889,6 +889,8 @@ enum rtnetlink_groups {
RTNLGRP_NOP4,
RTNLGRP_IPV6_PREFIX,
#define RTNLGRP_IPV6_PREFIX RTNLGRP_IPV6_PREFIX
RTNLGRP_IPV6_RULE,
#define RTNLGRP_IPV6_RULE RTNLGRP_IPV6_RULE
__RTNLGRP_MAX
};
#define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
......
......@@ -155,7 +155,6 @@ struct fib6_table {
#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
#define RT6_TABLE_MAIN RT_TABLE_MAIN
#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
#define RT6_TABLE_DFLT RT6_TABLE_MAIN
#define RT6_TABLE_INFO RT6_TABLE_MAIN
#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
......@@ -163,9 +162,11 @@ struct fib6_table {
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_MIN 1
#define FIB6_TABLE_MAX RT_TABLE_MAX
#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
#else
#define FIB6_TABLE_MIN RT_TABLE_MAIN
#define FIB6_TABLE_MAX FIB6_TABLE_MIN
#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
#endif
#define RT6_F_STRICT 1
......@@ -221,5 +222,11 @@ extern void fib6_run_gc(unsigned long dummy);
extern void fib6_gc_cleanup(void);
extern void fib6_init(void);
extern void fib6_rules_init(void);
extern void fib6_rules_cleanup(void);
extern int fib6_rules_dump(struct sk_buff *,
struct netlink_callback *);
#endif
#endif
......@@ -41,6 +41,11 @@ struct pol_chain {
extern struct rt6_info ip6_null_entry;
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
extern struct rt6_info ip6_prohibit_entry;
extern struct rt6_info ip6_blk_hole_entry;
#endif
extern int ip6_rt_gc_interval;
extern void ip6_route_input(struct sk_buff *skb);
......
......@@ -139,6 +139,7 @@ config IPV6_TUNNEL
config IPV6_MULTIPLE_TABLES
bool "IPv6: Multiple Routing Tables"
depends on IPV6 && EXPERIMENTAL
select FIB_RULES
---help---
Support multiple routing tables.
......@@ -13,6 +13,7 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o sit.o \
ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
xfrm6_output.o
ipv6-$(CONFIG_NETFILTER) += netfilter.o
ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
ipv6-objs += $(ipv6-y)
obj-$(CONFIG_INET6_AH) += ah6.o
......
......@@ -3528,6 +3528,7 @@ static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
[RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
[RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
.dumpit = inet6_dump_fib, },
[RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
};
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
......
/*
* net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
*
* Copyright (C)2003-2006 Helsinki University of Technology
* Copyright (C)2003-2006 USAGI/WIDE Project
*
* 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, version 2.
*
* Authors
* Thomas Graf <tgraf@suug.ch>
* Ville Nuorvala <vnuorval@tcs.hut.fi>
*/
#include <linux/config.h>
#include <linux/netdevice.h>
#include <net/fib_rules.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/netlink.h>
struct fib6_rule
{
struct fib_rule common;
struct rt6key src;
struct rt6key dst;
u8 tclass;
};
static struct fib_rules_ops fib6_rules_ops;
static struct fib6_rule main_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0x7FFE,
.action = FR_ACT_TO_TBL,
.table = RT6_TABLE_MAIN,
},
};
static struct fib6_rule local_rule = {
.common = {
.refcnt = ATOMIC_INIT(2),
.pref = 0,
.action = FR_ACT_TO_TBL,
.table = RT6_TABLE_LOCAL,
.flags = FIB_RULE_PERMANENT,
},
};
static LIST_HEAD(fib6_rules);
struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
pol_lookup_t lookup)
{
struct fib_lookup_arg arg = {
.lookup_ptr = lookup,
};
fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
if (arg.rule)
fib_rule_put(arg.rule);
return (struct dst_entry *) arg.result;
}
int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
int flags, struct fib_lookup_arg *arg)
{
struct rt6_info *rt = NULL;
struct fib6_table *table;
pol_lookup_t lookup = arg->lookup_ptr;
switch (rule->action) {
case FR_ACT_TO_TBL:
break;
case FR_ACT_UNREACHABLE:
rt = &ip6_null_entry;
goto discard_pkt;
default:
case FR_ACT_BLACKHOLE:
rt = &ip6_blk_hole_entry;
goto discard_pkt;
case FR_ACT_PROHIBIT:
rt = &ip6_prohibit_entry;
goto discard_pkt;
}
table = fib6_get_table(rule->table);
if (table)
rt = lookup(table, flp, flags);
if (rt != &ip6_null_entry)
goto out;
dst_release(&rt->u.dst);
discard_pkt:
dst_hold(&rt->u.dst);
out:
arg->result = rt;
return rt == NULL ? -EAGAIN : 0;
}
static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
struct fib6_rule *r = (struct fib6_rule *) rule;
if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
return 0;
if ((flags & RT6_F_HAS_SADDR) &&
!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
return 0;
return 1;
}
static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = {
[FRA_IFNAME] = { .type = NLA_STRING },
[FRA_PRIORITY] = { .type = NLA_U32 },
[FRA_SRC] = { .minlen = sizeof(struct in6_addr) },
[FRA_DST] = { .minlen = sizeof(struct in6_addr) },
};
static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
struct nlattr **tb)
{
int err = -EINVAL;
struct fib6_rule *rule6 = (struct fib6_rule *) rule;
if (frh->src_len > 128 || frh->dst_len > 128 ||
(frh->tos & ~IPV6_FLOWINFO_MASK))
goto errout;
if (rule->action == FR_ACT_TO_TBL) {
if (rule->table == RT6_TABLE_UNSPEC)
goto errout;
if (fib6_new_table(rule->table) == NULL) {
err = -ENOBUFS;
goto errout;
}
}
if (tb[FRA_SRC])
nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
sizeof(struct in6_addr));
if (tb[FRA_DST])
nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
sizeof(struct in6_addr));
rule6->src.plen = frh->src_len;
rule6->dst.plen = frh->dst_len;
rule6->tclass = frh->tos;
err = 0;
errout:
return err;
}
static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
struct nlattr **tb)
{
struct fib6_rule *rule6 = (struct fib6_rule *) rule;
if (frh->src_len && (rule6->src.plen != frh->src_len))
return 0;
if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
return 0;
if (frh->tos && (rule6->tclass != frh->tos))
return 0;
if (tb[FRA_SRC] &&
nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
return 0;
if (tb[FRA_DST] &&
nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
return 0;
return 1;
}
static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
{
struct fib6_rule *rule6 = (struct fib6_rule *) rule;
frh->family = AF_INET6;
frh->dst_len = rule6->dst.plen;
frh->src_len = rule6->src.plen;
frh->tos = rule6->tclass;
if (rule6->dst.plen)
NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
&rule6->dst.addr);
if (rule6->src.plen)
NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
&rule6->src.addr);
return 0;
nla_put_failure:
return -ENOBUFS;
}
int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
return fib_rules_dump(skb, cb, AF_INET6);
}
static u32 fib6_rule_default_pref(void)
{
return 0x3FFF;
}
static struct fib_rules_ops fib6_rules_ops = {
.family = AF_INET6,
.rule_size = sizeof(struct fib6_rule),
.action = fib6_rule_action,
.match = fib6_rule_match,
.configure = fib6_rule_configure,
.compare = fib6_rule_compare,
.fill = fib6_rule_fill,
.default_pref = fib6_rule_default_pref,
.nlgroup = RTNLGRP_IPV6_RULE,
.policy = fib6_rule_policy,
.rules_list = &fib6_rules,
.owner = THIS_MODULE,
};
void __init fib6_rules_init(void)
{
list_add_tail(&local_rule.common.list, &fib6_rules);
list_add_tail(&main_rule.common.list, &fib6_rules);
fib_rules_register(&fib6_rules_ops);
}
void fib6_rules_cleanup(void)
{
fib_rules_unregister(&fib6_rules_ops);
}
......@@ -159,6 +159,15 @@ static struct fib6_table fib6_main_tbl = {
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
static struct fib6_table fib6_local_tbl = {
.tb6_id = RT6_TABLE_LOCAL,
.tb6_lock = RW_LOCK_UNLOCKED,
.tb6_root = {
.leaf = &ip6_null_entry,
.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
},
};
#define FIB_TABLE_HASHSZ 256
static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
......@@ -228,20 +237,10 @@ struct fib6_table *fib6_get_table(u32 id)
return NULL;
}
struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
pol_lookup_t lookup)
{
/*
* TODO: Add rule lookup
*/
struct fib6_table *table = fib6_get_table(RT6_TABLE_MAIN);
return (struct dst_entry *) lookup(table, fl, flags);
}
static void __init fib6_tables_init(void)
{
fib6_link_table(&fib6_main_tbl);
fib6_link_table(&fib6_local_tbl);
}
#else
......
......@@ -140,6 +140,50 @@ struct rt6_info ip6_null_entry = {
.rt6i_ref = ATOMIC_INIT(1),
};
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
struct rt6_info ip6_prohibit_entry = {
.u = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
.__use = 1,
.dev = &loopback_dev,
.obsolete = -1,
.error = -EACCES,
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
.input = ip6_pkt_discard,
.output = ip6_pkt_discard_out,
.ops = &ip6_dst_ops,
.path = (struct dst_entry*)&ip6_prohibit_entry,
}
},
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
.rt6i_metric = ~(u32) 0,
.rt6i_ref = ATOMIC_INIT(1),
};
struct rt6_info ip6_blk_hole_entry = {
.u = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
.__use = 1,
.dev = &loopback_dev,
.obsolete = -1,
.error = -EINVAL,
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
.input = ip6_pkt_discard,
.output = ip6_pkt_discard_out,
.ops = &ip6_dst_ops,
.path = (struct dst_entry*)&ip6_blk_hole_entry,
}
},
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
.rt6i_metric = ~(u32) 0,
.rt6i_ref = ATOMIC_INIT(1),
};
#endif
/* allocate dst with ip6_dst_ops */
static __inline__ struct rt6_info *ip6_dst_alloc(void)
{
......@@ -2408,10 +2452,16 @@ void __init ip6_route_init(void)
#ifdef CONFIG_XFRM
xfrm6_init();
#endif
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
fib6_rules_init();
#endif
}
void ip6_route_cleanup(void)
{
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
fib6_rules_cleanup();
#endif
#ifdef CONFIG_PROC_FS
proc_net_remove("ipv6_route");
proc_net_remove("rt6_stats");
......
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