diff options
| author | Daniel Borkmann | 2016-02-19 23:05:25 +0100 |
|---|---|---|
| committer | David S. Miller | 2016-02-22 04:07:10 +0100 |
| commit | 3697649ff29e0f647565eed04b27a7779c646a22 (patch) | |
| tree | f6777555e1879ba3af5cb96673f3674bb72ca7c0 /include/linux/skbuff.h | |
| parent | bpf: remove artificial bpf_skb_{load, store}_bytes buffer limitation (diff) | |
| download | kernel-qcow2-linux-3697649ff29e0f647565eed04b27a7779c646a22.tar.gz kernel-qcow2-linux-3697649ff29e0f647565eed04b27a7779c646a22.tar.xz kernel-qcow2-linux-3697649ff29e0f647565eed04b27a7779c646a22.zip | |
bpf: try harder on clones when writing into skb
When we're dealing with clones and the area is not writeable, try
harder and get a copy via pskb_expand_head(). Replace also other
occurences in tc actions with the new skb_try_make_writable().
Reported-by: Ashhad Sheikh <ashhadsheikh394@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 89b536796e53..6a57757a86cf 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2630,6 +2630,13 @@ static inline int skb_clone_writable(const struct sk_buff *skb, unsigned int len skb_headroom(skb) + len <= skb->hdr_len; } +static inline int skb_try_make_writable(struct sk_buff *skb, + unsigned int write_len) +{ + return skb_cloned(skb) && !skb_clone_writable(skb, write_len) && + pskb_expand_head(skb, 0, 0, GFP_ATOMIC); +} + static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom, int cloned) { |