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 | rwlock_t blk_fill_in_prog_lock; |
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 | union { |
74 | unsigned long *rx_owner_map; |
75 | struct tpacket_kbdq_core prb_bdqc; |
76 | }; |
77 | }; |
78 | |
79 | extern struct mutex fanout_mutex; |
80 | #define PACKET_FANOUT_MAX (1 << 16) |
81 | |
82 | struct packet_fanout { |
83 | possible_net_t net; |
84 | unsigned int num_members; |
85 | u32 max_num_members; |
86 | u16 id; |
87 | u8 type; |
88 | u8 flags; |
89 | union { |
90 | atomic_t rr_cur; |
91 | struct bpf_prog __rcu *bpf_prog; |
92 | }; |
93 | struct list_head list; |
94 | spinlock_t lock; |
95 | refcount_t sk_ref; |
96 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
97 | struct sock __rcu *arr[] __counted_by(max_num_members); |
98 | }; |
99 | |
100 | struct packet_rollover { |
101 | int sock; |
102 | atomic_long_t num; |
103 | atomic_long_t num_huge; |
104 | atomic_long_t num_failed; |
105 | #define ROLLOVER_HLEN (L1_CACHE_BYTES / sizeof(u32)) |
106 | u32 history[ROLLOVER_HLEN] ____cacheline_aligned; |
107 | } ____cacheline_aligned_in_smp; |
108 | |
109 | struct packet_sock { |
110 | /* struct sock has to be the first member of packet_sock */ |
111 | struct sock sk; |
112 | struct packet_fanout *fanout; |
113 | union tpacket_stats_u stats; |
114 | struct packet_ring_buffer rx_ring; |
115 | struct packet_ring_buffer tx_ring; |
116 | int copy_thresh; |
117 | spinlock_t bind_lock; |
118 | struct mutex pg_vec_lock; |
119 | unsigned long flags; |
120 | int ifindex; /* bound device */ |
121 | u8 vnet_hdr_sz; |
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 completion skb_completion; |
131 | struct net_device __rcu *cached_dev; |
132 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
133 | atomic_t tp_drops ____cacheline_aligned_in_smp; |
134 | }; |
135 | |
136 | #define pkt_sk(ptr) container_of_const(ptr, struct packet_sock, sk) |
137 | |
138 | enum packet_sock_flags { |
139 | PACKET_SOCK_ORIGDEV, |
140 | PACKET_SOCK_AUXDATA, |
141 | PACKET_SOCK_TX_HAS_OFF, |
142 | PACKET_SOCK_TP_LOSS, |
143 | PACKET_SOCK_RUNNING, |
144 | PACKET_SOCK_PRESSURE, |
145 | PACKET_SOCK_QDISC_BYPASS, |
146 | }; |
147 | |
148 | static inline void packet_sock_flag_set(struct packet_sock *po, |
149 | enum packet_sock_flags flag, |
150 | bool val) |
151 | { |
152 | if (val) |
153 | set_bit(nr: flag, addr: &po->flags); |
154 | else |
155 | clear_bit(nr: flag, addr: &po->flags); |
156 | } |
157 | |
158 | static inline bool packet_sock_flag(const struct packet_sock *po, |
159 | enum packet_sock_flags flag) |
160 | { |
161 | return test_bit(flag, &po->flags); |
162 | } |
163 | |
164 | #endif |
165 | |