From f7b493e02101bb5a0a69a91a8b4b7b002cd60eaf Mon Sep 17 00:00:00 2001 From: Matt Carlson Date: Wed, 25 Feb 2009 14:21:52 +0000 Subject: tg3: Drop non-VLAN rx pkts larger than the MTU The hardware's MTU is configured so that it will accept packets whose VLAN tag is left inline. This means that the hardware will also accept other packets larger than the desired MTU size. This patch checks for and discards packets that are larger than the requested MTU but are not VLAN tagged frames. Signed-off-by: Matt Carlson Signed-off-by: Benjamin Li Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/tg3.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/net') diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index c7bbbb19f000..774a01ab03be 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -4339,6 +4339,13 @@ static int tg3_rx(struct tg3 *tp, int budget) skb->ip_summed = CHECKSUM_NONE; skb->protocol = eth_type_trans(skb, tp->dev); + + if (len > (tp->dev->mtu + ETH_HLEN) && + skb->protocol != htons(ETH_P_8021Q)) { + dev_kfree_skb(skb); + goto next_pkt; + } + #if TG3_VLAN_TAG_USED if (tp->vlgrp != NULL && desc->type_flags & RXD_FLAG_VLAN) { @@ -6824,7 +6831,8 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy) __tg3_set_mac_addr(tp, 0); /* MTU + ethernet header + FCS + optional VLAN tag */ - tw32(MAC_RX_MTU_SIZE, tp->dev->mtu + ETH_HLEN + 8); + tw32(MAC_RX_MTU_SIZE, + tp->dev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN); /* The slot time is changed by tg3_setup_phy if we * run at gigabit with half duplex. -- cgit v1.2.2