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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* 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_rx.h"
#include "built_in.h"
void destroy_rx_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_RX_RING, &ring->layout,
sizeof(ring->layout));
if (unlikely(ret))
panic("Cannot destroy the RX_RING: %s!\n", strerror(errno));
xfree(ring->frames);
}
void setup_rx_ring_layout(int sock, struct ring *ring, unsigned int size,
int jumbo_support)
{
fmemset(&ring->layout, 0, sizeof(ring->layout));
ring->layout.tp_block_size = (jumbo_support ?
getpagesize() << 4 :
getpagesize() << 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;
bug_on(ring->layout.tp_block_size < ring->layout.tp_frame_size);
bug_on((ring->layout.tp_block_size % ring->layout.tp_frame_size) != 0);
bug_on((ring->layout.tp_block_size % getpagesize()) != 0);
}
void create_rx_ring(int sock, struct ring *ring, int verbose)
{
int ret;
set_sockopt_tpacket(sock);
retry:
ret = setsockopt(sock, SOL_PACKET, PACKET_RX_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 RX_RING!\n");
ring->mm_len = ring->layout.tp_block_size * ring->layout.tp_block_nr;
if (verbose) {
printf("RX: %.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);
}
}
void mmap_rx_ring(int sock, struct ring *ring)
{
ring->mm_space = mmap(0, ring->mm_len, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
if (ring->mm_space == MAP_FAILED) {
destroy_rx_ring(sock, ring);
panic("Cannot mmap RX_RING!\n");
}
}
void alloc_rx_ring_frames(struct ring *ring)
{
int i;
size_t len = ring->layout.tp_frame_nr * sizeof(*ring->frames);
ring->frames = xmalloc_aligned(len, CO_CACHE_LINE_SIZE);
fmemset(ring->frames, 0, len);
for (i = 0; i < ring->layout.tp_frame_nr; ++i) {
ring->frames[i].iov_len = ring->layout.tp_frame_size;
ring->frames[i].iov_base = ring->mm_space +
(i * ring->layout.tp_frame_size);
}
}
void bind_rx_ring(int sock, struct ring *ring, int ifindex)
{
int ret;
/*
* The 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_protocol = htons(ETH_P_ALL);
ring->s_ll.sll_ifindex = ifindex;
ring->s_ll.sll_hatype = 0;
ring->s_ll.sll_halen = 0;
ring->s_ll.sll_pkttype = 0;
ret = bind(sock, (struct sockaddr *) &ring->s_ll, sizeof(ring->s_ll));
if (ret < 0) {
destroy_rx_ring(sock, ring);
panic("Cannot bind RX_RING!\n");
}
}
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