net/packet/internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PACKET_INTERNAL_H__
   3 #define __PACKET_INTERNAL_H__
   4
   5 #include <linux/refcount.h>
   6
   7 struct packet_mclist {
   8         struct packet_mclist    *next;
   9         int                     ifindex;
  10         int                     count;
  11         unsigned short          type;
  12         unsigned short          alen;
  13         unsigned char           addr[MAX_ADDR_LEN];
  14 };
  15
  16 /* kbdq - kernel block descriptor queue */
  17 struct tpacket_kbdq_core {
  18         struct pgv      *pkbdq;
  19         unsigned int    feature_req_word;
  20         unsigned int    hdrlen;
  21         unsigned char   reset_pending_on_curr_blk;
  22         unsigned char   delete_blk_timer;
  23         unsigned short  kactive_blk_num;
  24         unsigned short  blk_sizeof_priv;
  25
  26         /* last_kactive_blk_num:
  27          * trick to see if user-space has caught up
  28          * in order to avoid refreshing timer when every single pkt arrives.
  29          */
  30         unsigned short  last_kactive_blk_num;
  31
  32         char            *pkblk_start;
  33         char            *pkblk_end;
  34         int             kblk_size;
  35         unsigned int    max_frame_len;
  36         unsigned int    knum_blocks;
  37         uint64_t        knxt_seq_num;
  38         char            *prev;
  39         char            *nxt_offset;
  40         struct sk_buff  *skb;
  41
  42         atomic_t        blk_fill_in_prog;
  43
  44         /* Default is set to 8ms */
  45 #define DEFAULT_PRB_RETIRE_TOV  (8)
  46
  47         unsigned short  retire_blk_tov;
  48         unsigned short  version;
  49         unsigned long   tov_in_jiffies;
  50
  51         /* timer to retire an outstanding block */
  52         struct timer_list retire_blk_timer;
  53 };
  54
  55 struct pgv {
  56         char *buffer;
  57 };
  58
  59 struct packet_ring_buffer {
  60         struct pgv              *pg_vec;
  61
  62         unsigned int            head;
  63         unsigned int            frames_per_block;
  64         unsigned int            frame_size;
  65         unsigned int            frame_max;
  66
  67         unsigned int            pg_vec_order;
  68         unsigned int            pg_vec_pages;
  69         unsigned int            pg_vec_len;
  70
  71         unsigned int __percpu   *pending_refcnt;
  72
  73         struct tpacket_kbdq_core        prb_bdqc;
  74 };
  75
  76 extern struct mutex fanout_mutex;
  77 #define PACKET_FANOUT_MAX       256
  78
  79 struct packet_fanout {
  80         possible_net_t          net;
  81         unsigned int            num_members;
  82         u16                     id;
  83         u8                      type;
  84         u8                      flags;
  85         union {
  86                 atomic_t                rr_cur;
  87                 struct bpf_prog __rcu   *bpf_prog;
  88         };
  89         struct list_head        list;
  90         struct sock             *arr[PACKET_FANOUT_MAX];
  91         spinlock_t              lock;
  92         refcount_t              sk_ref;
  93         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
  94 };
  95
  96 struct packet_rollover {
  97         int                     sock;
  98         struct rcu_head         rcu;
  99         atomic_long_t           num;
 100         atomic_long_t           num_huge;
 101         atomic_long_t           num_failed;
 102 #define ROLLOVER_HLEN   (L1_CACHE_BYTES / sizeof(u32))
 103         u32                     history[ROLLOVER_HLEN] ____cacheline_aligned;
 104 } ____cacheline_aligned_in_smp;
 105
 106 struct packet_sock {
 107         /* struct sock has to be the first member of packet_sock */
 108         struct sock             sk;
 109         struct packet_fanout    *fanout;
 110         union  tpacket_stats_u  stats;
 111         struct packet_ring_buffer       rx_ring;
 112         struct packet_ring_buffer       tx_ring;
 113         int                     copy_thresh;
 114         spinlock_t              bind_lock;
 115         struct mutex            pg_vec_lock;
 116         unsigned int            running:1,      /* prot_hook is attached*/
 117                                 auxdata:1,
 118                                 origdev:1,
 119                                 has_vnet_hdr:1;
 120         int                     pressure;
 121         int                     ifindex;        /* bound device         */
 122         __be16                  num;
 123         struct packet_rollover  *rollover;
 124         struct packet_mclist    *mclist;
 125         atomic_t                mapped;
 126         enum tpacket_versions   tp_version;
 127         unsigned int            tp_hdrlen;
 128         unsigned int            tp_reserve;
 129         unsigned int            tp_loss:1;
 130         unsigned int            tp_tx_has_off:1;
 131         unsigned int            tp_tstamp;
 132         struct net_device __rcu *cached_dev;
 133         int                     (*xmit)(struct sk_buff *skb);
 134         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
 135 };
 136
 137 static struct packet_sock *pkt_sk(struct sock *sk)
 138 {
 139         return (struct packet_sock *)sk;
 140 }
 141
 142 #endif