diff options
Diffstat (limited to 'include/net/udp.h')
| -rw-r--r-- | include/net/udp.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index 79d141d2103b..f2c1178f6e12 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -476,6 +476,16 @@ static inline struct sk_buff *udp_rcv_segment(struct sock *sk, if (!inet_get_convert_csum(sk)) features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + /* UDP segmentation expects packets of type CHECKSUM_PARTIAL or + * CHECKSUM_NONE in __udp_gso_segment. UDP GRO indeed builds partial + * packets in udp_gro_complete_segment. As does UDP GSO, verified by + * udp_send_skb. But when those packets are looped in dev_loopback_xmit + * their ip_summed is set to CHECKSUM_UNNECESSARY. Reset in this + * specific case, where PARTIAL is both correct and required. + */ + if (skb->pkt_type == PACKET_LOOPBACK) + skb->ip_summed = CHECKSUM_PARTIAL; + /* the GSO CB lays after the UDP one, no need to save and restore any * CB fragment */ |