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-rw-r--r--include/net/mptcp.h9
-rw-r--r--include/net/udp.h7
2 files changed, 10 insertions, 6 deletions
diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index 27627e2d1bc2..c971d25431ea 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -174,15 +174,12 @@ static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
#endif /* CONFIG_MPTCP */
-void mptcp_handle_ipv6_mapped(struct sock *sk, bool mapped);
-
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
int mptcpv6_init(void);
+void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
#elif IS_ENABLED(CONFIG_IPV6)
-static inline int mptcpv6_init(void)
-{
- return 0;
-}
+static inline int mptcpv6_init(void) { return 0; }
+static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
#endif
#endif /* __NET_MPTCP_H */
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))
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;
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