linux-kernel - [PATCH stable 4.4 V2 4/6] tcp: free batches of packets in tcp_prune_ofo

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Message-ID: <1536913450-12380-5-git-send-email-maowenan@huawei.com>
Date:   Fri, 14 Sep 2018 16:24:08 +0800
From:   Mao Wenan <maowenan@...wei.com>
To:     <netdev@...r.kernel.org>, <gregkh@...ux-foundation.org>,
        <dwmw2@...radead.org>, <eric.dumazet@...il.com>,
        <davem@...emloft.net>, <stable@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <maowenan@...wei.com>
Subject: [PATCH stable 4.4 V2 4/6] tcp: free batches of packets in tcp_prune_ofo_queue()

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 72cd43ba64fc172a443410ce01645895850844c8 ]

Juha-Matti Tilli reported that malicious peers could inject tiny
packets in out_of_order_queue, forcing very expensive calls
to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for
every incoming packet. out_of_order_queue rb-tree can contain
thousands of nodes, iterating over all of them is not nice.

Before linux-4.9, we would have pruned all packets in ofo_queue
in one go, every XXXX packets. XXXX depends on sk_rcvbuf and skbs
truesize, but is about 7000 packets with tcp_rmem[2] default of 6 MB.

Since we plan to increase tcp_rmem[2] in the future to cope with
modern BDP, can not revert to the old behavior, without great pain.

Strategy taken in this patch is to purge ~12.5 % of the queue capacity.

Fixes: 36a6503fedda ("tcp: refine tcp_prune_ofo_queue() to not drop all packets")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Juha-Matti Tilli <juha-matti.tilli@....fi>
Acked-by: Yuchung Cheng <ycheng@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Mao Wenan <maowenan@...wei.com>
---
 net/ipv4/tcp_input.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4cc0a53..4739a93 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4899,27 +4899,33 @@ new_range:
 
 /*
  * Purge the out-of-order queue.
+ * Drop at least 12.5 % of sk_rcvbuf to avoid malicious attacks.
  * Return true if queue was pruned.
  */
 static bool tcp_prune_ofo_queue(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct rb_node *node, *prev;
+	int goal;
 
 	if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
 		return false;
 
 	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_OFOPRUNED);
-
+	goal = sk->sk_rcvbuf >> 3;
 	node = &tp->ooo_last_skb->rbnode;
 	do {
 		prev = rb_prev(node);
 		rb_erase(node, &tp->out_of_order_queue);
+		goal -= rb_to_skb(node)->truesize;
 		__kfree_skb(rb_to_skb(node));
-		sk_mem_reclaim(sk);
-		if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf &&
-		    !tcp_under_memory_pressure(sk))
-			break;
+		if (!prev || goal <= 0) {
+			sk_mem_reclaim(sk);
+			if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf &&
+			    !tcp_under_memory_pressure(sk))
+				break;
+			goal = sk->sk_rcvbuf >> 3;
+		}
 
 		node = prev;
 	} while (node);
-- 
1.8.3.1