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authorWillem de Bruijn <willemb@google.com>2019-02-07 14:54:16 -0500
committerAlexei Starovoitov <ast@kernel.org>2019-02-10 19:57:34 -0800
commitb90efd2258749e04e1b3f71ef0d716f2ac2337e0 (patch)
tree80309f233c9c0c374e9c8b9832f21fc44b8590c4 /include
parentd623876646be119439999a229a2c3ce30fd197fb (diff)
downloadlinux-b90efd2258749e04e1b3f71ef0d716f2ac2337e0.tar.bz2
bpf: only adjust gso_size on bytestream protocols
bpf_skb_change_proto and bpf_skb_adjust_room change skb header length. For GSO packets they adjust gso_size to maintain the same MTU. The gso size can only be safely adjusted on bytestream protocols. Commit d02f51cbcf12 ("bpf: fix bpf_skb_adjust_net/bpf_skb_proto_xlat to deal with gso sctp skbs") excluded SKB_GSO_SCTP. Since then type SKB_GSO_UDP_L4 has been added, whose contents are one gso_size unit per datagram. Also exclude these. Move from a blacklist to a whitelist check to future proof against additional such new GSO types, e.g., for fraglist based GRO. Fixes: bec1f6f69736 ("udp: generate gso with UDP_SEGMENT") Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 95d25b010a25..5a7a8b93a5ab 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -4212,6 +4212,12 @@ static inline bool skb_is_gso_sctp(const struct sk_buff *skb)
return skb_shinfo(skb)->gso_type & SKB_GSO_SCTP;
}
+static inline bool skb_is_gso_tcp(const struct sk_buff *skb)
+{
+ return skb_is_gso(skb) &&
+ skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6);
+}
+
static inline void skb_gso_reset(struct sk_buff *skb)
{
skb_shinfo(skb)->gso_size = 0;