From c02bd115b1d25931159f89c7d9bf47a30f5d4b41 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Wed, 9 Dec 2020 14:39:56 -0800 Subject: Revert "geneve: pull IP header before ECN decapsulation" This reverts commit 4179b00c04d1 ("geneve: pull IP header before ECN decapsulation"). Eric says: "network header should have been pulled already before hitting geneve_rx()". Let's revert the syzbot fix since it's causing more harm than good, and revisit. Suggested-by: Eric Dumazet Reported-by: Jianlin Shi Fixes: 4179b00c04d1 ("geneve: pull IP header before ECN decapsulation") Link: https://bugzilla.kernel.org/show_bug.cgi?id=210569 Link: https://lore.kernel.org/netdev/CANn89iJVWfb=2i7oU1=D55rOyQnBbbikf+Mc6XHMkY7YX-yGEw@mail.gmail.com/ Signed-off-by: Jakub Kicinski --- drivers/net/geneve.c | 20 ++++---------------- 1 file changed, 4 insertions(+), 16 deletions(-) (limited to 'drivers/net/geneve.c') diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index 8ae9ce2014a4..1426bfc009bc 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -257,21 +257,11 @@ static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, skb_dst_set(skb, &tun_dst->dst); /* Ignore packet loops (and multicast echo) */ - if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) - goto rx_error; - - switch (skb_protocol(skb, true)) { - case htons(ETH_P_IP): - if (pskb_may_pull(skb, sizeof(struct iphdr))) - goto rx_error; - break; - case htons(ETH_P_IPV6): - if (pskb_may_pull(skb, sizeof(struct ipv6hdr))) - goto rx_error; - break; - default: - goto rx_error; + if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { + geneve->dev->stats.rx_errors++; + goto drop; } + oiph = skb_network_header(skb); skb_reset_network_header(skb); @@ -308,8 +298,6 @@ static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, dev_sw_netstats_rx_add(geneve->dev, len); return; -rx_error: - geneve->dev->stats.rx_errors++; drop: /* Consume bad packet */ kfree_skb(skb); -- cgit v1.2.3-58-ga151