udp: Introduce recvmmsg()/sendmmsg(), zero-copy path from socket

Packets are received directly onto pre-cooked, static buffers
for IPv4 (with partial checksum pre-calculation) and IPv6 frames,
with pre-filled Ethernet addresses and, partially, IP headers,
and sent out from the same buffers with sendmmsg(), for both
passt and pasta (non-local traffic only) modes.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/pcap.h b/pcap.h
index c69c3b0..d41c68b 100644
--- a/pcap.h
+++ b/pcap.h
@@ -1,2 +1,4 @@
 void pcap(char *pkt, size_t len);
+void pcapm(struct msghdr *mh);
+void pcapmm(struct mmsghdr *mmh, unsigned int vlen);
 void pcap_init(struct ctx *c, int sock_index);