tcp - Should we frame whole packet ( headers , check sum, etc ) to use netmap? -



tcp - Should we frame whole packet ( headers , check sum, etc ) to use netmap? -

i reddish netmap allows user programmers access packets in user space, means user applications can read / send network packets using netamp.

netmap : http://info.iet.unipi.it/~luigi/netmap/

can 1 familiar netamp, tell me should create entire packet want send out, or using stack features send out.

edit : here illustration on how utilize api https://www.freebsd.org/cgi/man.cgi?query=netmap&sektion=4

#include <net/netmap_user.h> void sender(void) { struct netmap_if *nifp; struct netmap_ring *ring; struct nmreq nmr; struct pollfd fds; fd = open("/dev/netmap", o_rdwr); bzero(&nmr, sizeof(nmr)); strcpy(nmr.nr_name, "ix0"); nmr.nm_version = netmap_api; ioctl(fd, niocregif, &nmr); p = mmap(0, nmr.nr_memsize, fd); nifp = netmap_if(p, nmr.nr_offset); ring = netmap_txring(nifp, 0); fds.fd = fd; fds.events = pollout; (;;) { poll(&fds, 1, -1); while (!nm_ring_empty(ring)) { = ring->cur; buf = netmap_buf(ring, ring->slot[i].buf_index); // here saying build packet ... prepare packet in buf ... ring->slot[i].len = ... packet length ... ring->head = ring->cur = nm_ring_next(ring, i); } } }

you need create entire packed, including ethernet, ip , tcp headers. netmap bypasses kernel network stack, need work yourself.

tcp network-programming

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