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 <pabeni@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e20cf8d3

include/linux/udp.h

+11 −0
Original line number Diff line number Diff line
@@ -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)

net/ipv4/udp.c

+4 −0
Original line number Diff line number Diff line
@@ -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);

net/ipv6/udp.c

+3 −0
Original line number Diff line number Diff line
@@ -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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