/* * netsniff-ng - the packet sniffing beast * Copyright 2009, 2010 Daniel Borkmann. * Copyright 2009, 2010 Emmanuel Roullit. * Copyright 2014, 2015 Tobias Klauser. * Subject to the GPL, version 2. */ #include #include #include #include #include #include #include #include #include #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) { setup_ring_layout_generic(sock, ring, size, jumbo_support); 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) { shrink_ring_layout_generic(ring); 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); } lue='committer'>committer

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