diff options
| author | Willem de Bruijn <willemb@google.com> | 2017-08-08 14:22:55 -0400 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-09-10 16:36:09 -0400 |
| commit | 01deb691e5351838e8ec355ef243b59bfbed672c (patch) | |
| tree | c50c24deb911615777e4efd485e7e40c868833ec | |
| parent | 731160f5e5dc50a7b91b5033b9d99658ef43e68f (diff) | |
net: avoid skb_warn_bad_offload false positives on UFO
[ Upstream commit 8d63bee643f1fb53e472f0e135cae4eb99d62d19 ]
skb_warn_bad_offload triggers a warning when an skb enters the GSO
stack at __skb_gso_segment that does not have CHECKSUM_PARTIAL
checksum offload set.
Commit b2504a5dbef3 ("net: reduce skb_warn_bad_offload() noise")
observed that SKB_GSO_DODGY producers can trigger the check and
that passing those packets through the GSO handlers will fix it
up. But, the software UFO handler will set ip_summed to
CHECKSUM_NONE.
When __skb_gso_segment is called from the receive path, this
triggers the warning again.
Make UFO set CHECKSUM_UNNECESSARY instead of CHECKSUM_NONE. On
Tx these two are equivalent. On Rx, this better matches the
skb state (checksum computed), as CHECKSUM_NONE here means no
checksum computed.
See also this thread for context:
http://patchwork.ozlabs.org/patch/799015/
Fixes: b2504a5dbef3 ("net: reduce skb_warn_bad_offload() noise")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
| -rw-r--r-- | net/core/dev.c | 2 | ||||
| -rw-r--r-- | net/ipv4/udp_offload.c | 2 | ||||
| -rw-r--r-- | net/ipv6/udp_offload.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 6581775b2ed9..bb711e5e345b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2466,7 +2466,7 @@ static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) { if (tx_path) return skb->ip_summed != CHECKSUM_PARTIAL && - skb->ip_summed != CHECKSUM_NONE; + skb->ip_summed != CHECKSUM_UNNECESSARY; return skb->ip_summed == CHECKSUM_NONE; } diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index dfcab88c3e74..8f27dce93f71 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -231,7 +231,7 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, if (uh->check == 0) uh->check = CSUM_MANGLED_0; - skb->ip_summed = CHECKSUM_NONE; + skb->ip_summed = CHECKSUM_UNNECESSARY; /* Fragment the skb. IP headers of the fragments are updated in * inet_gso_segment() diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index 01582966ffa0..2e3c12eeca07 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -86,7 +86,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, if (uh->check == 0) uh->check = CSUM_MANGLED_0; - skb->ip_summed = CHECKSUM_NONE; + skb->ip_summed = CHECKSUM_UNNECESSARY; /* Check if there is enough headroom to insert fragment header. */ tnl_hlen = skb_tnl_header_len(skb); |