Commit bcd1665e authored by Paolo Abeni's avatar Paolo Abeni Committed by David S. Miller
Browse files

udp: add support for UDP_GRO cmsg

When UDP GRO is enabled, the UDP_GRO cmsg will carry the ingress
datagram size. User-space can use such info to compute the original
packets layout.

Signed-off-by: default avatarPaolo Abeni <>
Signed-off-by: default avatarDavid S. Miller <>
parent e20cf8d3
......@@ -121,6 +121,17 @@ static inline bool udp_get_no_check6_rx(struct sock *sk)
return udp_sk(sk)->no_check6_rx;
static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
int gso_size;
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
gso_size = skb_shinfo(skb)->gso_size;
put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size);
#define udp_portaddr_for_each_entry(__sk, list) \
hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
......@@ -1711,6 +1711,10 @@ try_again:
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
*addr_len = sizeof(*sin);
if (udp_sk(sk)->gro_enabled)
udp_cmsg_recv(msg, sk, skb);
if (inet->cmsg_flags)
ip_cmsg_recv_offset(msg, sk, skb, sizeof(struct udphdr), off);
......@@ -417,6 +417,9 @@ try_again:
*addr_len = sizeof(*sin6);
if (udp_sk(sk)->gro_enabled)
udp_cmsg_recv(msg, sk, skb);
if (np->rxopt.all)
ip6_datagram_recv_common_ctl(sk, msg, skb);
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