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 struct list_head remove_list;
15 };
16
17 /* kbdq - kernel block descriptor queue */
18 struct tpacket_kbdq_core {
19 struct pgv *pkbdq;
20 unsigned int feature_req_word;
21 unsigned int hdrlen;
22 unsigned char reset_pending_on_curr_blk;
23 unsigned char delete_blk_timer;
24 unsigned short kactive_blk_num;
25 unsigned short blk_sizeof_priv;
26
27 /* last_kactive_blk_num:
28 * trick to see if user-space has caught up
29 * in order to avoid refreshing timer when every single pkt arrives.
30 */
31 unsigned short last_kactive_blk_num;
32
33 char *pkblk_start;
34 char *pkblk_end;
35 int kblk_size;
36 unsigned int max_frame_len;
37 unsigned int knum_blocks;
38 uint64_t knxt_seq_num;
39 char *prev;
40 char *nxt_offset;
41 struct sk_buff *skb;
42
43 rwlock_t blk_fill_in_prog_lock;
44
45 /* Default is set to 8ms */
46 #define DEFAULT_PRB_RETIRE_TOV (8)
47
48 unsigned short retire_blk_tov;
49 unsigned short version;
50 unsigned long tov_in_jiffies;
51
52 /* timer to retire an outstanding block */
53 struct timer_list retire_blk_timer;
54 };
55
56 struct pgv {
57 char *buffer;
58 };
59
60 struct packet_ring_buffer {
61 struct pgv *pg_vec;
62
63 unsigned int head;
64 unsigned int frames_per_block;
65 unsigned int frame_size;
66 unsigned int frame_max;
67
68 unsigned int pg_vec_order;
69 unsigned int pg_vec_pages;
70 unsigned int pg_vec_len;
71
72 unsigned int __percpu *pending_refcnt;
73
74 union {
75 unsigned long *rx_owner_map;
76 struct tpacket_kbdq_core prb_bdqc;
77 };
78 };
79
80 extern struct mutex fanout_mutex;
81 #define PACKET_FANOUT_MAX (1 << 16)
82
83 struct packet_fanout {
84 possible_net_t net;
85 unsigned int num_members;
86 u32 max_num_members;
87 u16 id;
88 u8 type;
89 u8 flags;
90 union {
91 atomic_t rr_cur;
92 struct bpf_prog __rcu *bpf_prog;
93 };
94 struct list_head list;
95 spinlock_t lock;
96 refcount_t sk_ref;
97 struct packet_type prot_hook ____cacheline_aligned_in_smp;
98 struct sock __rcu *arr[] __counted_by(max_num_members);
99 };
100
101 struct packet_rollover {
102 int sock;
103 atomic_long_t num;
104 atomic_long_t num_huge;
105 atomic_long_t num_failed;
106 #define ROLLOVER_HLEN (L1_CACHE_BYTES / sizeof(u32))
107 u32 history[ROLLOVER_HLEN] ____cacheline_aligned;
108 } ____cacheline_aligned_in_smp;
109
110 struct packet_sock {
111 /* struct sock has to be the first member of packet_sock */
112 struct sock sk;
113 struct packet_fanout *fanout;
114 union tpacket_stats_u stats;
115 struct packet_ring_buffer rx_ring;
116 struct packet_ring_buffer tx_ring;
117 int copy_thresh;
118 spinlock_t bind_lock;
119 struct mutex pg_vec_lock;
120 unsigned long flags;
121 int ifindex; /* bound device */
122 u8 vnet_hdr_sz;
123 __be16 num;
124 struct packet_rollover *rollover;
125 struct packet_mclist *mclist;
126 atomic_long_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 completion skb_completion;
132 struct net_device __rcu *cached_dev;
133 struct packet_type prot_hook ____cacheline_aligned_in_smp;
134 atomic_t tp_drops ____cacheline_aligned_in_smp;
135 };
136
137 #define pkt_sk(ptr) container_of_const(ptr, struct packet_sock, sk)
138
139 enum packet_sock_flags {
140 PACKET_SOCK_ORIGDEV,
141 PACKET_SOCK_AUXDATA,
142 PACKET_SOCK_TX_HAS_OFF,
143 PACKET_SOCK_TP_LOSS,
144 PACKET_SOCK_RUNNING,
145 PACKET_SOCK_PRESSURE,
146 PACKET_SOCK_QDISC_BYPASS,
147 };
148
packet_sock_flag_set(struct packet_sock * po,enum packet_sock_flags flag,bool val)149 static inline void packet_sock_flag_set(struct packet_sock *po,
150 enum packet_sock_flags flag,
151 bool val)
152 {
153 if (val)
154 set_bit(flag, &po->flags);
155 else
156 clear_bit(flag, &po->flags);
157 }
158
packet_sock_flag(const struct packet_sock * po,enum packet_sock_flags flag)159 static inline bool packet_sock_flag(const struct packet_sock *po,
160 enum packet_sock_flags flag)
161 {
162 return test_bit(flag, &po->flags);
163 }
164
165 #endif
166