all: import netsniff-ng 0.5.8-rc0 source

We decided to get rid of the old Git history and start a new one for
several reasons:

 *) Allow / enforce only high-quality commits (which was not the case
    for many commits in the history), have a policy that is more close
    to the one from the Linux kernel. With high quality commits, we
    mean code that is logically split into commits and commit messages
    that are signed-off and have a proper subject and message body.
    We do not allow automatic Github merges anymore, since they are
    total bullshit. However, we will either cherry-pick your patches
    or pull them manually.

 *) The old archive was about ~27MB for no particular good reason.
    This basically derived from the bad decision that also some PDF
    files where stored there. From this moment onwards, no binary
    objects are allowed to be stored in this repository anymore.

The old archive is not wiped away from the Internet. You will still
be able to find it, e.g. on git.cryptoism.org etc.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 130 insertions, 0 deletions

diff --git a/ring_rx.c b/ring_rx.c
new file mode 100644
index 0000000..c4c6a38
--- /dev/null
+++ b/ring_rx.c
@@ -0,0 +1,130 @@
+/*
+ * 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)
+{
+	fmemset(&ring->layout, 0, sizeof(ring->layout));
+	setsockopt(sock, SOL_PACKET, PACKET_RX_RING, &ring->layout,
+		   sizeof(ring->layout));
+
+	munmap(ring->mm_space, ring->mm_len);
+	ring->mm_len = 0;
+
+	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");
+	}
+}