linux/net/ipv6/fib6_rules.c
Daniel Lezcano 9eb87f3f7e [IPV6]: Make fib6_rules_init to return an error code.
When the fib_rules initialization finished, no return code is provided
so there is no way to know, for the caller, if the initialization has
been successful or has failed. This patch fix that.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:56:46 -08:00

290 lines
6.3 KiB
C

/*
* 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/netdevice.h>
#include <net/fib_rules.h>
#include <net/ipv6.h>
#include <net/addrconf.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;
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);
if (arg.result)
return arg.result;
dst_hold(&ip6_null_entry.u.dst);
return &ip6_null_entry.u.dst;
}
static 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) {
struct fib6_rule *r = (struct fib6_rule *)rule;
/*
* If we need to find a source address for this traffic,
* we check the result if it meets requirement of the rule.
*/
if ((rule->flags & FIB_RULE_FIND_SADDR) &&
r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
struct in6_addr saddr;
if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst,
&saddr))
goto again;
if (!ipv6_prefix_equal(&saddr, &r->src.addr,
r->src.plen))
goto again;
ipv6_addr_copy(&flp->fl6_src, &saddr);
}
goto out;
}
again:
dst_release(&rt->u.dst);
rt = NULL;
goto out;
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 (r->dst.plen &&
!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
return 0;
/*
* If FIB_RULE_FIND_SADDR is set and we do not have a
* source address for the traffic, we defer check for
* source address.
*/
if (r->src.plen) {
if (flags & RT6_LOOKUP_F_HAS_SADDR) {
if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
r->src.plen))
return 0;
} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
return 0;
}
if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
return 0;
return 1;
}
static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
FRA_GENERIC_POLICY,
};
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 (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 (frh->src_len)
nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
sizeof(struct in6_addr));
if (frh->dst_len)
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 (frh->src_len &&
nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
return 0;
if (frh->dst_len &&
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;
}
static u32 fib6_rule_default_pref(void)
{
return 0x3FFF;
}
static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
{
return nla_total_size(16) /* dst */
+ nla_total_size(16); /* src */
}
static struct fib_rules_ops fib6_rules_ops = {
.family = AF_INET6,
.rule_size = sizeof(struct fib6_rule),
.addr_size = sizeof(struct in6_addr),
.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,
.nlmsg_payload = fib6_rule_nlmsg_payload,
.nlgroup = RTNLGRP_IPV6_RULE,
.policy = fib6_rule_policy,
.rules_list = LIST_HEAD_INIT(fib6_rules_ops.rules_list),
.owner = THIS_MODULE,
};
static int __init fib6_default_rules_init(void)
{
int err;
err = fib_default_rule_add(&fib6_rules_ops, 0,
RT6_TABLE_LOCAL, FIB_RULE_PERMANENT);
if (err < 0)
return err;
err = fib_default_rule_add(&fib6_rules_ops, 0x7FFE, RT6_TABLE_MAIN, 0);
if (err < 0)
return err;
return 0;
}
int __init fib6_rules_init(void)
{
int ret;
ret = fib6_default_rules_init();
if (ret)
goto out;
ret = fib_rules_register(&fib6_rules_ops);
if (ret)
goto out_default_rules_init;
out:
return ret;
out_default_rules_init:
fib_rules_cleanup_ops(&fib6_rules_ops);
goto out;
}
void fib6_rules_cleanup(void)
{
fib_rules_unregister(&fib6_rules_ops);
}