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 atomic_long_t num; 99 atomic_long_t num_huge; 100 atomic_long_t num_failed; 101 #define ROLLOVER_HLEN (L1_CACHE_BYTES / sizeof(u32)) 102 u32 history[ROLLOVER_HLEN] ____cacheline_aligned; 103 } ____cacheline_aligned_in_smp; 104 105 struct packet_sock { 106 /* struct sock has to be the first member of packet_sock */ 107 struct sock sk; 108 struct packet_fanout *fanout; 109 union tpacket_stats_u stats; 110 struct packet_ring_buffer rx_ring; 111 struct packet_ring_buffer tx_ring; 112 int copy_thresh; 113 spinlock_t bind_lock; 114 struct mutex pg_vec_lock; 115 unsigned int running; /* bind_lock must be held */ 116 unsigned int auxdata:1, /* writer must hold sock lock */ 117 origdev:1, 118 has_vnet_hdr:1, 119 tp_loss:1, 120 tp_tx_has_off:1; 121 int pressure; 122 int ifindex; /* bound device */ 123 __be16 num; 124 struct packet_rollover *rollover; 125 struct packet_mclist *mclist; 126 atomic_t mapped; 127 enum tpacket_versions tp_version; 128 unsigned int tp_hdrlen; 129 unsigned int tp_reserve; 130 unsigned int tp_tstamp; 131 struct net_device __rcu *cached_dev; 132 int (*xmit)(struct sk_buff *skb); 133 struct packet_type prot_hook ____cacheline_aligned_in_smp; 134 }; 135 136 static struct packet_sock *pkt_sk(struct sock *sk) 137 { 138 return (struct packet_sock *)sk; 139 } 140 141 #endif 142