diff options
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index cf8252d05a01..7e048288fcab 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2120,8 +2120,24 @@ static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, /* Note, we are only interested in != 0 or == 0, thus the * force to int. */ - return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, - inet_compute_pseudo); + err = (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, + inet_compute_pseudo); + if (err) + return err; + + if (skb->ip_summed == CHECKSUM_COMPLETE && !skb->csum_valid) { + /* If SW calculated the value, we know it's bad */ + if (skb->csum_complete_sw) + return 1; + + /* HW says the value is bad. Let's validate that. + * skb->csum is no longer the full packet checksum, + * so don't treat it as such. + */ + skb_checksum_complete_unset(skb); + } + + return 0; } /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |