Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __PACKET_INTERNAL_H__
3#define __PACKET_INTERNAL_H__
4
5#include <linux/refcount.h>
6
7struct 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 */
17struct 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
55struct pgv {
56 char *buffer;
57};
58
59struct 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
75extern struct mutex fanout_mutex;
76#define PACKET_FANOUT_MAX 256
77
78struct 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
95struct 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
104struct 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
135static struct packet_sock *pkt_sk(struct sock *sk)
136{
137 return (struct packet_sock *)sk;
138}
139
140#endif