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_pages; 68 unsigned int pg_vec_len; 69 70 unsigned int __percpu *pending_refcnt; 71 72 struct tpacket_kbdq_core prb_bdqc; 73 }; 74 75 extern struct mutex fanout_mutex; 76 #define PACKET_FANOUT_MAX 256 77 78 struct packet_fanout { 79 possible_net_t net; 80 unsigned int num_members; 81 u16 id; 82 u8 type; 83 u8 flags; 84 union { 85 atomic_t rr_cur; 86 struct bpf_prog __rcu *bpf_prog; 87 }; 88 struct list_head list; 89 struct sock *arr[PACKET_FANOUT_MAX]; 90 spinlock_t lock; 91 refcount_t sk_ref; 92 struct packet_type prot_hook ____cacheline_aligned_in_smp; 93 }; 94 95 struct packet_rollover { 96 int sock; 97 atomic_long_t num; 98 atomic_long_t num_huge; 99 atomic_long_t num_failed; 100 #define ROLLOVER_HLEN (L1_CACHE_BYTES / sizeof(u32)) 101 u32 history[ROLLOVER_HLEN] ____cacheline_aligned; 102 } ____cacheline_aligned_in_smp; 103 104 struct packet_sock { 105 /* struct sock has to be the first member of packet_sock */ 106 struct sock sk; 107 struct packet_fanout *fanout; 108 union tpacket_stats_u stats; 109 struct packet_ring_buffer rx_ring; 110 struct packet_ring_buffer tx_ring; 111 int copy_thresh; 112 spinlock_t bind_lock; 113 struct mutex pg_vec_lock; 114 unsigned int running; /* bind_lock must be held */ 115 unsigned int auxdata:1, /* writer must hold sock lock */ 116 origdev:1, 117 has_vnet_hdr:1, 118 tp_loss:1, 119 tp_tx_has_off: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_tstamp; 130 struct net_device __rcu *cached_dev; 131 int (*xmit)(struct sk_buff *skb); 132 struct packet_type prot_hook ____cacheline_aligned_in_smp; 133 }; 134 135 static struct packet_sock *pkt_sk(struct sock *sk) 136 { 137 return (struct packet_sock *)sk; 138 } 139 140 #endif 141