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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* Copyright 2014, 2015 Tobias Klauser
* Subject to the GPL, version 2.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/if_ether.h>
#include "xmalloc.h"
#include "die.h"
#include "ring.h"
#include "built_in.h"
void setup_ring_layout_generic(int sock, struct ring *ring, size_t size,
bool jumbo_support)
{
fmemset(&ring->layout, 0, sizeof(ring->layout));
ring->layout.tp_block_size = (jumbo_support ?
RUNTIME_PAGE_SIZE << 4 :
RUNTIME_PAGE_SIZE << 2);
ring->layout.tp_frame_size = (jumbo_support ?
TPACKET_ALIGNMENT << 12 :
TPACKET_ALIGNMENT << 7);
ring->layout.tp_block_nr = size / ring->layout.tp_block_size;
ring->layout.tp_frame_nr = size / ring->layout.tp_frame_size;
}
void mmap_ring_generic(int sock, struct ring *ring)
{
ring->mm_space = mmap(NULL, ring->mm_len, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
if (ring->mm_space == MAP_FAILED)
panic("Cannot mmap {TX,RX}_RING!\n");
}
void alloc_ring_frames_generic(struct ring *ring, size_t num, size_t size)
{
size_t i, len = num * sizeof(*ring->frames);
ring->frames = xmalloc_aligned(len, CO_CACHE_LINE_SIZE);
fmemset(ring->frames, 0, len);
for (i = 0; i < num; ++i) {
ring->frames[i].iov_len = size;
ring->frames[i].iov_base = ring->mm_space + (i * size);
}
}
void bind_ring_generic(int sock, struct ring *ring, int ifindex, bool tx_only)
{
int ret;
/* The {TX,RX}_RING registers itself to the networking stack with
* dev_add_pack(), so we have one single RX_RING for all devs
* otherwise you'll get the packet twice.
*/
fmemset(&ring->s_ll, 0, sizeof(ring->s_ll));
ring->s_ll.sll_family = AF_PACKET;
ring->s_ll.sll_ifindex = ifindex;
ring->s_ll.sll_protocol = tx_only ? 0 : htons(ETH_P_ALL);
ret = bind(sock, (struct sockaddr *) &ring->s_ll, sizeof(ring->s_ll));
if (ret < 0)
panic("Cannot bind {TX,RX}_RING!\n");
}
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