net/packet/internal.h

   1 #ifndef __PACKET_INTERNAL_H__
   2 #define __PACKET_INTERNAL_H__
   3
   4 struct 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 */
  14 struct 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
  51 struct pgv {
  52         char *buffer;
  53 };
  54
  55 struct 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         unsigned int __percpu   *pending_refcnt;
  68
  69         struct tpacket_kbdq_core        prb_bdqc;
  70 };
  71
  72 extern struct mutex fanout_mutex;
  73 #define PACKET_FANOUT_MAX       256
  74
  75 struct 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
  92 struct 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 net_device __rcu *cached_dev;
 117         int                     (*xmit)(struct sk_buff *skb);
 118         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
 119 };
 120
 121 static struct packet_sock *pkt_sk(struct sock *sk)
 122 {
 123         return (struct packet_sock *)sk;
 124 }
 125
 126 #endif