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Commit 9a99d4a5 authored by Cong Wang's avatar Cong Wang Committed by David S. Miller
Browse files

icmp: avoid allocating large struct on stack 



struct icmp_bxm is a large struct, reduce stack usage
by allocating it on heap.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Joe Perches <joe@perches.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: default avatarCong Wang <amwang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08578d8d

net/ipv4/icmp.c

+23 −17
Original line number Diff line number Diff line
@@ -482,7 +482,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) 
{

	struct iphdr *iph;

	int room;

	struct icmp_bxm icmp_param;

	struct icmp_bxm *icmp_param;

	struct rtable *rt = skb_rtable(skb_in);

	struct ipcm_cookie ipc;

	struct flowi4 fl4;
@@ -558,9 +558,13 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) 
		}

	}



	icmp_param = kmalloc(sizeof(*icmp_param), GFP_ATOMIC);

	if (!icmp_param)

		return;



	sk = icmp_xmit_lock(net);

	if (sk == NULL)

		return;

		goto out_free;



	/*

	 *	Construct source address and options.
@@ -586,7 +590,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) 
					   IPTOS_PREC_INTERNETCONTROL) :

					  iph->tos;



	if (ip_options_echo(&icmp_param.replyopts.opt.opt, skb_in))

	if (ip_options_echo(&icmp_param->replyopts.opt.opt, skb_in))

		goto out_unlock;
@@ -594,19 +598,19 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) 
	 *	Prepare data for ICMP header.

	 */



	icmp_param.data.icmph.type	 = type;

	icmp_param.data.icmph.code	 = code;

	icmp_param.data.icmph.un.gateway = info;

	icmp_param.data.icmph.checksum	 = 0;

	icmp_param.skb	  = skb_in;

	icmp_param.offset = skb_network_offset(skb_in);

	icmp_param->data.icmph.type	 = type;

	icmp_param->data.icmph.code	 = code;

	icmp_param->data.icmph.un.gateway = info;

	icmp_param->data.icmph.checksum	 = 0;

	icmp_param->skb	  = skb_in;

	icmp_param->offset = skb_network_offset(skb_in);

	inet_sk(sk)->tos = tos;

	ipc.addr = iph->saddr;

	ipc.opt = &icmp_param.replyopts.opt;

	ipc.opt = &icmp_param->replyopts.opt;

	ipc.tx_flags = 0;



	rt = icmp_route_lookup(net, &fl4, skb_in, iph, saddr, tos,

			       type, code, &icmp_param);

			       type, code, icmp_param);

	if (IS_ERR(rt))

		goto out_unlock;
@@ -618,19 +622,21 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) 
	room = dst_mtu(&rt->dst);

	if (room > 576)

		room = 576;

	room -= sizeof(struct iphdr) + icmp_param.replyopts.opt.opt.optlen;

	room -= sizeof(struct iphdr) + icmp_param->replyopts.opt.opt.optlen;

	room -= sizeof(struct icmphdr);



	icmp_param.data_len = skb_in->len - icmp_param.offset;

	if (icmp_param.data_len > room)

		icmp_param.data_len = room;

	icmp_param.head_len = sizeof(struct icmphdr);

	icmp_param->data_len = skb_in->len - icmp_param->offset;

	if (icmp_param->data_len > room)

		icmp_param->data_len = room;

	icmp_param->head_len = sizeof(struct icmphdr);



	icmp_push_reply(&icmp_param, &fl4, &ipc, &rt);

	icmp_push_reply(icmp_param, &fl4, &ipc, &rt);

ende:

	ip_rt_put(rt);

out_unlock:

	icmp_xmit_unlock(sk);

out_free:

	kfree(icmp_param);

out:;

}

EXPORT_SYMBOL(icmp_send);