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ipv4: Enforce max MTU metric at route insertion time. 

Rather than at every struct rtable creation.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-10 07:02:09 -07:00
parent 5943634fc5
commit 710ab6c031
2 changed files with 3 additions and 6 deletions
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2
net/ipv4/fib_semantics.c
View File

@ -794,6 +794,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
val = nla_get_u32(nla);
if (type == RTAX_ADVMSS && val > 65535 - 40)
val = 65535 - 40;
if (type == RTAX_MTU && val > 65535 - 15)
val = 65535 - 15;
fi->fib_metrics[type - 1] = val;
}
}

7
net/ipv4/route.c
View File

@ -1763,21 +1763,16 @@ static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *fl4,
const struct fib_result *res,
struct fib_info *fi, u16 type, u32 itag)
{
struct dst_entry *dst = &rt->dst;
if (fi) {
if (FIB_RES_GW(*res) &&
FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
rt->rt_gateway = FIB_RES_GW(*res);
rt_init_metrics(rt, fl4, fi);
#ifdef CONFIG_IP_ROUTE_CLASSID
dst->tclassid = FIB_RES_NH(*res).nh_tclassid;
rt->dst.tclassid = FIB_RES_NH(*res).nh_tclassid;
#endif
}
if (dst_mtu(dst) > IP_MAX_MTU)
dst_metric_set(dst, RTAX_MTU, IP_MAX_MTU);
#ifdef CONFIG_IP_ROUTE_CLASSID
#ifdef CONFIG_IP_MULTIPLE_TABLES
set_class_tag(rt, fib_rules_tclass(res));