ring_tx.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2009, 2010 Daniel Borkmann.
   4  * Subject to the GPL, version 2.
   5  */
   6
   7 #ifndef TX_RING_H
   8 #define TX_RING_H
   9
  10 #include "ring.h"
  11 #include "built_in.h"
  12
  13 /* Give userland 10 us time to push packets to the ring */
  14 #define TX_KERNEL_PULL_INT      10
  15
  16 extern void destroy_tx_ring(int sock, struct ring *ring);
  17 extern void create_tx_ring(int sock, struct ring *ring, int verbose);
  18 extern void mmap_tx_ring(int sock, struct ring *ring);
  19 extern void alloc_tx_ring_frames(struct ring *ring);
  20 extern void bind_tx_ring(int sock, struct ring *ring, int ifindex);
  21 extern void setup_tx_ring_layout(int sock, struct ring *ring,
  22                                  unsigned int size, int jumbo_support);
  23 extern void set_packet_loss_discard(int sock);
  24
  25 static inline int user_may_pull_from_tx(struct tpacket2_hdr *hdr)
  26 {
  27         return ((hdr->tp_status & TP_STATUS_AVAILABLE) == TP_STATUS_AVAILABLE);
  28 }
  29
  30 static inline void kernel_may_pull_from_tx(struct tpacket2_hdr *hdr)
  31 {
  32         hdr->tp_status = TP_STATUS_SEND_REQUEST;
  33 }
  34
  35 static inline int pull_and_flush_tx_ring(int sock)
  36 {
  37         return sendto(sock, NULL, 0, MSG_DONTWAIT, NULL, 0);
  38 }
  39
  40 static inline int pull_and_flush_tx_ring_wait(int sock)
  41 {
  42         return sendto(sock, NULL, 0, 0, NULL, 0);
  43 }
  44
  45 #endif /* TX_RING_H */