LXR linux/net/packet/internal.h

   1#ifndef __PACKET_INTERNAL_H__
   2#define __PACKET_INTERNAL_H__
   3
   4struct packet_mclist {
   5        struct packet_mclist    *next;
   6        int                     ifindex;
   7        int                     count;
   8        unsigned short          type;
   9        unsigned short          alen;
  10        unsigned char           addr[MAX_ADDR_LEN];
  11};
  12
  13/* kbdq - kernel block descriptor queue */
  14struct tpacket_kbdq_core {
  15        struct pgv      *pkbdq;
  16        unsigned int    feature_req_word;
  17        unsigned int    hdrlen;
  18        unsigned char   reset_pending_on_curr_blk;
  19        unsigned char   delete_blk_timer;
  20        unsigned short  kactive_blk_num;
  21        unsigned short  blk_sizeof_priv;
  22
  23        /* last_kactive_blk_num:
  24         * trick to see if user-space has caught up
  25         * in order to avoid refreshing timer when every single pkt arrives.
  26         */
  27        unsigned short  last_kactive_blk_num;
  28
  29        char            *pkblk_start;
  30        char            *pkblk_end;
  31        int             kblk_size;
  32        unsigned int    knum_blocks;
  33        uint64_t        knxt_seq_num;
  34        char            *prev;
  35        char            *nxt_offset;
  36        struct sk_buff  *skb;
  37
  38        atomic_t        blk_fill_in_prog;
  39
  40        /* Default is set to 8ms */
  41#define DEFAULT_PRB_RETIRE_TOV  (8)
  42
  43        unsigned short  retire_blk_tov;
  44        unsigned short  version;
  45        unsigned long   tov_in_jiffies;
  46
  47        /* timer to retire an outstanding block */
  48        struct timer_list retire_blk_timer;
  49};
  50
  51struct pgv {
  52        char *buffer;
  53};
  54
  55struct packet_ring_buffer {
  56        struct pgv              *pg_vec;
  57
  58        unsigned int            head;
  59        unsigned int            frames_per_block;
  60        unsigned int            frame_size;
  61        unsigned int            frame_max;
  62
  63        unsigned int            pg_vec_order;
  64        unsigned int            pg_vec_pages;
  65        unsigned int            pg_vec_len;
  66
  67        atomic_t                pending;
  68
  69        struct tpacket_kbdq_core        prb_bdqc;
  70};
  71
  72extern struct mutex fanout_mutex;
  73#define PACKET_FANOUT_MAX       256
  74
  75struct packet_fanout {
  76#ifdef CONFIG_NET_NS
  77        struct net              *net;
  78#endif
  79        unsigned int            num_members;
  80        u16                     id;
  81        u8                      type;
  82        u8                      flags;
  83        atomic_t                rr_cur;
  84        struct list_head        list;
  85        struct sock             *arr[PACKET_FANOUT_MAX];
  86        int                     next[PACKET_FANOUT_MAX];
  87        spinlock_t              lock;
  88        atomic_t                sk_ref;
  89        struct packet_type      prot_hook ____cacheline_aligned_in_smp;
  90};
  91
  92struct packet_sock {
  93        /* struct sock has to be the first member of packet_sock */
  94        struct sock             sk;
  95        struct packet_fanout    *fanout;
  96        union  tpacket_stats_u  stats;
  97        struct packet_ring_buffer       rx_ring;
  98        struct packet_ring_buffer       tx_ring;
  99        int                     copy_thresh;
 100        spinlock_t              bind_lock;
 101        struct mutex            pg_vec_lock;
 102        unsigned int            running:1,      /* prot_hook is attached*/
 103                                auxdata:1,
 104                                origdev:1,
 105                                has_vnet_hdr:1;
 106        int                     ifindex;        /* bound device         */
 107        __be16                  num;
 108        struct packet_mclist    *mclist;
 109        atomic_t                mapped;
 110        enum tpacket_versions   tp_version;
 111        unsigned int            tp_hdrlen;
 112        unsigned int            tp_reserve;
 113        unsigned int            tp_loss:1;
 114        unsigned int            tp_tx_has_off:1;
 115        unsigned int            tp_tstamp;
 116        struct packet_type      prot_hook ____cacheline_aligned_in_smp;
 117};
 118
 119static struct packet_sock *pkt_sk(struct sock *sk)
 120{
 121        return (struct packet_sock *)sk;
 122}
 123
 124#endif
 125