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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* Copyright 2009, 2010 Emmanuel Roullit.
* 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 "die.h"
#include "xmalloc.h"
#include "ring_tx.h"
#include "built_in.h"
static void set_packet_loss_discard(int sock)
{
int ret, discard = 1;
ret = setsockopt(sock, SOL_PACKET, PACKET_LOSS, (void *) &discard,
sizeof(discard));
if (ret < 0)
panic("setsockopt: cannot set packet loss");
}
void destroy_tx_ring(int sock, struct ring *ring)
{
int ret;
munmap(ring->mm_space, ring->mm_len);
ring->mm_len = 0;
fmemset(&ring->layout, 0, sizeof(ring->layout));
ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
sizeof(ring->layout));
if (unlikely(ret))
panic("Cannot destroy the TX_RING: %s!\n", strerror(errno));
xfree(ring->frames);
}
static void setup_tx_ring_layout(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 = ring->layout.tp_block_size /
ring->layout.tp_frame_size *
ring->layout.tp_block_nr;
set_sockopt_tpacket_v2(sock);
ring_verify_layout(ring);
}
static void create_tx_ring(int sock, struct ring *ring, bool verbose)
{
int ret;
retry:
ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
sizeof(ring->layout));
if (errno == ENOMEM && ring->layout.tp_block_nr > 1) {
ring->layout.tp_block_nr >>= 1;
ring->layout.tp_frame_nr = ring->layout.tp_block_size /
ring->layout.tp_frame_size *
ring->layout.tp_block_nr;
goto retry;
}
if (ret < 0)
panic("Cannot allocate TX_RING!\n");
ring->mm_len = (size_t) ring->layout.tp_block_size * ring->layout.tp_block_nr;
if (verbose) {
printf("TX,V2: %.2Lf MiB, %u Frames, each %u Byte allocated\n",
(long double) ring->mm_len / (1 << 20),
ring->layout.tp_frame_nr, ring->layout.tp_frame_size);
}
}
static void alloc_tx_ring_frames(int sock __maybe_unused, struct ring *ring)
{
alloc_ring_frames_generic(ring, ring->layout.tp_frame_nr,
ring->layout.tp_frame_size);
}
void ring_tx_setup(struct ring *ring, int sock, size_t size, int ifindex,
bool jumbo_support, bool verbose)
{
fmemset(ring, 0, sizeof(*ring));
set_packet_loss_discard(sock);
setup_tx_ring_layout(sock, ring, size, jumbo_support);
create_tx_ring(sock, ring, verbose);
mmap_ring_generic(sock, ring);
alloc_tx_ring_frames(sock, ring);
bind_ring_generic(sock, ring, ifindex, true);
}
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