path: root/include/net
diff options
authorWillem de Bruijn <willemb@google.com>2020-01-29 15:20:17 -0500
committerDavid S. Miller <davem@davemloft.net>2020-01-30 09:59:53 +0100
commitd0208bf4da97f76237300afb83c097de25645de6 (patch)
tree730fd5e2dab782e690a1cb85ab01202ea91f0374 /include/net
parentmptcp: MPTCP_HMAC_TEST should depend on MPTCP (diff)
udp: document udp_rcv_segment special case for looped packets
Commit 6cd021a58c18a ("udp: segment looped gso packets correctly") fixes an issue with rare udp gso multicast packets looped onto the receive path. The stable backport makes the narrowest change to target only these packets, when needed. As opposed to, say, expanding __udp_gso_segment, which is harder to reason to be free from unintended side-effects. But the resulting code is hardly self-describing. Document its purpose and rationale. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
1 files changed, 7 insertions, 0 deletions
diff --git a/include/net/udp.h b/include/net/udp.h
index 4a180f2a13e3..e55d5f765807 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -476,6 +476,13 @@ static inline struct sk_buff *udp_rcv_segment(struct sock *sk,
if (!inet_get_convert_csum(sk))
+ /* 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;