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bpf: Expose __sk_buff wire_len/gso_segs to BPF_PROG_TEST_RUN 

wire_len should not be less than real len and is capped by GSO_MAX_SIZE.
gso_segs is capped by GSO_MAX_SEGS.

v2:
* set wire_len to skb->len when passed wire_len is 0 (Alexei Starovoitov)

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191213223028.161282-1-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2019-12-13 14:30:27 -08:00 committed by Alexei Starovoitov
parent 02620d9e62
commit 850a88cc40
1 changed files with 18 additions and 1 deletions
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19
net/bpf/test_run.c
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@ -267,8 +267,10 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
return -EINVAL;
/* tstamp is allowed */
/* wire_len is allowed */
/* gso_segs is allowed */
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, tstamp),
if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
sizeof(struct __sk_buff)))
return -EINVAL;
@ -276,6 +278,19 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
skb->tstamp = __skb->tstamp;
memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
if (__skb->wire_len == 0) {
cb->pkt_len = skb->len;
} else {
if (__skb->wire_len < skb->len ||
__skb->wire_len > GSO_MAX_SIZE)
return -EINVAL;
cb->pkt_len = __skb->wire_len;
}
if (__skb->gso_segs > GSO_MAX_SEGS)
return -EINVAL;
skb_shinfo(skb)->gso_segs = __skb->gso_segs;
return 0;
}
@ -289,6 +304,8 @@ static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
__skb->priority = skb->priority;
__skb->tstamp = skb->tstamp;
memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
__skb->wire_len = cb->pkt_len;
__skb->gso_segs = skb_shinfo(skb)->gso_segs;
}
int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,