From 028b027524b162eef90839a92ba4b8bddf23e06c Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Sat, 12 Apr 2008 18:35:41 -0700 Subject: [DCCP]: Fix skb->cb conflicts with IP dev_queue_xmit() and the other IP output functions expect to get a skb with clear or properly initialized skb->cb. Unlike TCP and UDP, the dccp_skb_cb doesn't contain a struct inet_skb_parm at the beginning, so the DCCP-specific data is interpreted by the IP output functions. This can cause false negatives for the conditional POST_ROUTING hook invocation, making the packet bypass the hook. Add a inet_skb_parm/inet6_skb_parm union to the beginning of dccp_skb_cb to avoid clashes. Also add a BUILD_BUG_ON to make sure it fits in the cb. [ Combined with patch from Gerrit Renker to remove two now unnecessary memsets of IPCB(skb)->opt ] Signed-off-by: Patrick McHardy Acked-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/dccp.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'net/dccp/dccp.h') diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index 287a62bc2e0f..ba2ef94a2302 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -325,6 +325,12 @@ static inline int dccp_bad_service_code(const struct sock *sk, * This is used for transmission as well as for reception. */ struct dccp_skb_cb { + union { + struct inet_skb_parm h4; +#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) + struct inet6_skb_parm h6; +#endif + } header; __u8 dccpd_type:4; __u8 dccpd_ccval:4; __u8 dccpd_reset_code, -- cgit v1.2.3-58-ga151