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    max_frame_len;
  33         unsigned int    knum_blocks;
  34         uint64_t        knxt_seq_num;
  35         char            *prev;
  36         char            *nxt_offset;
  37         struct sk_buff  *skb;
  38
  39         atomic_t        blk_fill_in_prog;
  40
  41         /* Default is set to 8ms */
  42 #define DEFAULT_PRB_RETIRE_TOV  (8)
  43
  44         unsigned short  retire_blk_tov;
  45         unsigned short  version;
  46         unsigned long   tov_in_jiffies;
  47
  48         /* timer to retire an outstanding block */
  49         struct timer_list retire_blk_timer;
  50 };
  51
  52 struct pgv {
  53         char *buffer;
  54 };
  55
  56 struct packet_ring_buffer {
  57         struct pgv              *pg_vec;
  58
  59         unsigned int            head;
  60         unsigned int            frames_per_block;
  61         unsigned int            frame_size;
  62         unsigned int            frame_max;
  63
  64         unsigned int            pg_vec_order;
  65         unsigned int            pg_vec_pages;
  66         unsigned int            pg_vec_len;
  67
  68         unsigned int __percpu   *pending_refcnt;
  69
  70         struct tpacket_kbdq_core        prb_bdqc;
  71 };
  72
  73 extern struct mutex fanout_mutex;
  74 #define PACKET_FANOUT_MAX       256
  75
  76 struct packet_fanout {
  77         possible_net_t          net;
  78         unsigned int            num_members;
  79         u16                     id;
  80         u8                      type;
  81         u8                      flags;
  82         union {
  83                 atomic_t                rr_cur;
  84                 struct bpf_prog __rcu   *bpf_prog;
  85         };
  86         struct list_head        list;
  87         struct sock             *arr[PACKET_FANOUT_MAX];
  88         spinlock_t              lock;
  89         atomic_t                sk_ref;
  90         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
  91 };
  92
  93 struct packet_rollover {
  94         int                     sock;
  95         struct rcu_head         rcu;
  96         atomic_long_t           num;
  97         atomic_long_t           num_huge;
  98         atomic_long_t           num_failed;
  99 #define ROLLOVER_HLEN   (L1_CACHE_BYTES / sizeof(u32))
 100         u32                     history[ROLLOVER_HLEN] ____cacheline_aligned;
 101 } ____cacheline_aligned_in_smp;
 102
 103 struct packet_sock {
 104         /* struct sock has to be the first member of packet_sock */
 105         struct sock             sk;
 106         struct packet_fanout    *fanout;
 107         union  tpacket_stats_u  stats;
 108         struct packet_ring_buffer       rx_ring;
 109         struct packet_ring_buffer       tx_ring;
 110         int                     copy_thresh;
 111         spinlock_t              bind_lock;
 112         struct mutex            pg_vec_lock;
 113         unsigned int            running:1,      /* prot_hook is attached*/
 114                                 auxdata:1,
 115                                 origdev:1,
 116                                 has_vnet_hdr:1;
 117         int                     pressure;
 118         int                     ifindex;        /* bound device         */
 119         __be16                  num;
 120         struct packet_rollover  *rollover;
 121         struct packet_mclist    *mclist;
 122         atomic_t                mapped;
 123         enum tpacket_versions   tp_version;
 124         unsigned int            tp_hdrlen;
 125         unsigned int            tp_reserve;
 126         unsigned int            tp_loss:1;
 127         unsigned int            tp_tx_has_off:1;
 128         unsigned int            tp_tstamp;
 129         struct net_device __rcu *cached_dev;
 130         int                     (*xmit)(struct sk_buff *skb);
 131         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
 132 };
 133
 134 static struct packet_sock *pkt_sk(struct sock *sk)
 135 {
 136         return (struct packet_sock *)sk;
 137 }
 138
 139 #endif