linux/net/packet/internal.h
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   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        unsigned int            head;
  58        unsigned int            frames_per_block;
  59        unsigned int            frame_size;
  60        unsigned int            frame_max;
  61
  62        unsigned int            pg_vec_order;
  63        unsigned int            pg_vec_pages;
  64        unsigned int            pg_vec_len;
  65
  66        struct tpacket_kbdq_core        prb_bdqc;
  67        atomic_t                pending;
  68};
  69
  70extern struct mutex fanout_mutex;
  71#define PACKET_FANOUT_MAX       256
  72
  73struct packet_fanout {
  74#ifdef CONFIG_NET_NS
  75        struct net              *net;
  76#endif
  77        unsigned int            num_members;
  78        u16                     id;
  79        u8                      type;
  80        u8                      defrag;
  81        atomic_t                rr_cur;
  82        struct list_head        list;
  83        struct sock             *arr[PACKET_FANOUT_MAX];
  84        spinlock_t              lock;
  85        atomic_t                sk_ref;
  86        struct packet_type      prot_hook ____cacheline_aligned_in_smp;
  87};
  88
  89struct packet_sock {
  90        /* struct sock has to be the first member of packet_sock */
  91        struct sock             sk;
  92        struct packet_fanout    *fanout;
  93        struct tpacket_stats    stats;
  94        union  tpacket_stats_u  stats_u;
  95        struct packet_ring_buffer       rx_ring;
  96        struct packet_ring_buffer       tx_ring;
  97        int                     copy_thresh;
  98        spinlock_t              bind_lock;
  99        struct mutex            pg_vec_lock;
 100        unsigned int            running:1,      /* prot_hook is attached*/
 101                                auxdata:1,
 102                                origdev:1,
 103                                has_vnet_hdr:1;
 104        int                     ifindex;        /* bound device         */
 105        __be16                  num;
 106        struct packet_mclist    *mclist;
 107        atomic_t                mapped;
 108        enum tpacket_versions   tp_version;
 109        unsigned int            tp_hdrlen;
 110        unsigned int            tp_reserve;
 111        unsigned int            tp_loss:1;
 112        unsigned int            tp_tstamp;
 113        struct packet_type      prot_hook ____cacheline_aligned_in_smp;
 114};
 115
 116static struct packet_sock *pkt_sk(struct sock *sk)
 117{
 118        return (struct packet_sock *)sk;
 119}
 120
 121#endif
 122
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