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Commit 710ab6c0 authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Enforce max MTU metric at route insertion time. 



Rather than at every struct rtable creation.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5943634f

net/ipv4/fib_semantics.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

			}

		}

net/ipv4/route.c

+1 −6
Original line number Diff line number Diff line
@@ -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));