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authorHerbert Xu <herbert@gondor.apana.org.au>2006-06-27 16:22:38 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-29 19:57:53 -0400
commit576a30eb6453439b3c37ba24455ac7090c247b5a (patch)
treee0c427a61e3de5c93e797c09903d910f6f060e64 /include/net
parent68c1692e3ea5d79f24cb5cc566c4a73939d13d25 (diff)
[NET]: Added GSO header verification
When GSO packets come from an untrusted source (e.g., a Xen guest domain), we need to verify the header integrity before passing it to the hardware. Since the first step in GSO is to verify the header, we can reuse that code by adding a new bit to gso_type: SKB_GSO_DODGY. Packets with this bit set can only be fed directly to devices with the corresponding bit NETIF_F_GSO_ROBUST. If the device doesn't have that bit, then the skb is fed to the GSO engine which will allow the packet to be sent to the hardware if it passes the header check. This patch changes the sg flag to a full features flag. The same method can be used to implement TSO ECN support. We simply have to mark packets with CWR set with SKB_GSO_ECN so that only hardware with a corresponding NETIF_F_TSO_ECN can accept them. The GSO engine can either fully segment the packet, or segment the first MTU and pass the rest to the hardware for further segmentation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/protocol.h3
-rw-r--r--include/net/tcp.h2
2 files changed, 3 insertions, 2 deletions
diff --git a/include/net/protocol.h b/include/net/protocol.h
index 3b6dc15c68a5..40b6b9c9973f 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -36,7 +36,8 @@
36struct net_protocol { 36struct net_protocol {
37 int (*handler)(struct sk_buff *skb); 37 int (*handler)(struct sk_buff *skb);
38 void (*err_handler)(struct sk_buff *skb, u32 info); 38 void (*err_handler)(struct sk_buff *skb, u32 info);
39 struct sk_buff *(*gso_segment)(struct sk_buff *skb, int sg); 39 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
40 int features);
40 int no_policy; 41 int no_policy;
41}; 42};
42 43
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ca3d38dfc00b..624921e76332 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1086,7 +1086,7 @@ extern struct request_sock_ops tcp_request_sock_ops;
1086 1086
1087extern int tcp_v4_destroy_sock(struct sock *sk); 1087extern int tcp_v4_destroy_sock(struct sock *sk);
1088 1088
1089extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int sg); 1089extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features);
1090 1090
1091#ifdef CONFIG_PROC_FS 1091#ifdef CONFIG_PROC_FS
1092extern int tcp4_proc_init(void); 1092extern int tcp4_proc_init(void);