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-rw-r--r--ring.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/ring.c b/ring.c
new file mode 100644
index 0000000..2899df3
--- /dev/null
+++ b/ring.c
@@ -0,0 +1,64 @@
+/*
+ * 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.h"
+#include "built_in.h"
+
+void mmap_ring_generic(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)
+ panic("Cannot mmap {TX,RX}_RING!\n");
+}
+
+void alloc_ring_frames_generic(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_ring_generic(int sock, struct ring *ring, int ifindex)
+{
+ 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_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)
+ panic("Cannot bind {TX,RX}_RING!\n");
+}