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Commit 70b386a0 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

ip6mr: use nla_nest_* helpers 



This patch removes the skb manipulations when nested attributes are added by
using standard helpers.

Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d67b8c61

net/ipv6/ip6mr.c

+13 −13
Original line number Diff line number Diff line
@@ -2119,8 +2119,7 @@ static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, 
{

	int ct;

	struct rtnexthop *nhp;

	u8 *b = skb_tail_pointer(skb);

	struct rtattr *mp_head;

	struct nlattr *mp_attr;



	/* If cache is unresolved, don't try to parse IIF and OIF */

	if (c->mf6c_parent >= MAXMIFS)
@@ -2129,28 +2128,29 @@ static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, 
	if (MIF_EXISTS(mrt, c->mf6c_parent) &&

	    nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)

		return -EMSGSIZE;



	mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));

	mp_attr = nla_nest_start(skb, RTA_MULTIPATH);

	if (mp_attr == NULL)

		return -EMSGSIZE;



	for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {

		if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {

			if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))

				goto rtattr_failure;

			nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));

			nhp = nla_reserve_nohdr(skb, sizeof(*nhp));

			if (nhp == NULL) {

				nla_nest_cancel(skb, mp_attr);

				return -EMSGSIZE;

			}



			nhp->rtnh_flags = 0;

			nhp->rtnh_hops = c->mfc_un.res.ttls[ct];

			nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;

			nhp->rtnh_len = sizeof(*nhp);

		}

	}

	mp_head->rta_type = RTA_MULTIPATH;

	mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;



	nla_nest_end(skb, mp_attr);



	rtm->rtm_type = RTN_MULTICAST;

	return 1;



rtattr_failure:

	nlmsg_trim(skb, b);

	return -EMSGSIZE;

}



int ip6mr_get_route(struct net *net,