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authorWillem de Bruijn <willemb@google.com>2020-03-03 23:05:01 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-03-04 03:23:59 +0300
commitcf62089b0edd7e74a1f474844b4d9f7b5697fb5c (patch)
tree9daf8bfb7c74ff98ca4c507f8d5bf8184c4d7bec /net/bpf
parentabbc61a5f26d52a5d3abbbe552b275360b2c6631 (diff)
downloadlinux-cf62089b0edd7e74a1f474844b4d9f7b5697fb5c.tar.xz
bpf: Add gso_size to __sk_buff
BPF programs may want to know whether an skb is gso. The canonical answer is skb_is_gso(skb), which tests that gso_size != 0. Expose this field in the same manner as gso_segs. That field itself is not a sufficient signal, as the comment in skb_shared_info makes clear: gso_segs may be zero, e.g., from dodgy sources. Also prepare net/bpf/test_run for upcoming BPF_PROG_TEST_RUN tests of the feature. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200303200503.226217-2-willemdebruijn.kernel@gmail.com
Diffstat (limited to 'net/bpf')
-rw-r--r--net/bpf/test_run.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 562443f94133..1cd7a1c2f8b2 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -277,6 +277,12 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
/* gso_segs is allowed */
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
+ offsetof(struct __sk_buff, gso_size)))
+ return -EINVAL;
+
+ /* gso_size is allowed */
+
+ if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
sizeof(struct __sk_buff)))
return -EINVAL;
@@ -297,6 +303,7 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
if (__skb->gso_segs > GSO_MAX_SEGS)
return -EINVAL;
skb_shinfo(skb)->gso_segs = __skb->gso_segs;
+ skb_shinfo(skb)->gso_size = __skb->gso_size;
return 0;
}