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 <stdbool.h>
  11
  12 #include "ring.h"
  13 #include "built_in.h"
  14
  15 /* Give userland 10 us time to push packets to the ring */
  16 #define TX_KERNEL_PULL_INT      10
  17
  18 extern void destroy_tx_ring(int sock, struct ring *ring);
  19 extern void create_tx_ring(int sock, struct ring *ring, int verbose);
  20 extern void mmap_tx_ring(int sock, struct ring *ring);
  21 extern void alloc_tx_ring_frames(int sock, struct ring *ring);
  22 extern void bind_tx_ring(int sock, struct ring *ring, int ifindex);
  23 extern void setup_tx_ring_layout(int sock, struct ring *ring,
  24                                  unsigned int size, bool jumbo_support);
  25 extern void set_packet_loss_discard(int sock);
  26
  27 static inline int user_may_pull_from_tx(struct tpacket2_hdr *hdr)
  28 {
  29         return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
  30 }
  31
  32 static inline void kernel_may_pull_from_tx(struct tpacket2_hdr *hdr)
  33 {
  34         hdr->tp_status = TP_STATUS_SEND_REQUEST;
  35 }
  36
  37 static inline int pull_and_flush_tx_ring(int sock)
  38 {
  39         return sendto(sock, NULL, 0, MSG_DONTWAIT, NULL, 0);
  40 }
  41
  42 static inline int pull_and_flush_tx_ring_wait(int sock)
  43 {
  44         return sendto(sock, NULL, 0, 0, NULL, 0);
  45 }
  46
  47 #endif /* TX_RING_H */