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43a0c675 TH |
1 | /* |
2 | * Stream Parser | |
3 | * | |
4 | * Copyright (c) 2016 Tom Herbert <tom@herbertland.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 | |
8 | * as published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #ifndef __NET_STRPARSER_H_ | |
12 | #define __NET_STRPARSER_H_ | |
13 | ||
14 | #include <linux/skbuff.h> | |
15 | #include <net/sock.h> | |
16 | ||
17 | #define STRP_STATS_ADD(stat, count) ((stat) += (count)) | |
18 | #define STRP_STATS_INCR(stat) ((stat)++) | |
19 | ||
20 | struct strp_stats { | |
bbb03029 TH |
21 | unsigned long long msgs; |
22 | unsigned long long bytes; | |
23 | unsigned int mem_fail; | |
24 | unsigned int need_more_hdr; | |
25 | unsigned int msg_too_big; | |
26 | unsigned int msg_timeouts; | |
27 | unsigned int bad_hdr_len; | |
43a0c675 TH |
28 | }; |
29 | ||
30 | struct strp_aggr_stats { | |
bbb03029 TH |
31 | unsigned long long msgs; |
32 | unsigned long long bytes; | |
33 | unsigned int mem_fail; | |
34 | unsigned int need_more_hdr; | |
35 | unsigned int msg_too_big; | |
36 | unsigned int msg_timeouts; | |
37 | unsigned int bad_hdr_len; | |
38 | unsigned int aborts; | |
39 | unsigned int interrupted; | |
40 | unsigned int unrecov_intr; | |
43a0c675 TH |
41 | }; |
42 | ||
43 | struct strparser; | |
44 | ||
45 | /* Callbacks are called with lock held for the attached socket */ | |
46 | struct strp_callbacks { | |
47 | int (*parse_msg)(struct strparser *strp, struct sk_buff *skb); | |
48 | void (*rcv_msg)(struct strparser *strp, struct sk_buff *skb); | |
49 | int (*read_sock_done)(struct strparser *strp, int err); | |
50 | void (*abort_parser)(struct strparser *strp, int err); | |
bbb03029 TH |
51 | void (*lock)(struct strparser *strp); |
52 | void (*unlock)(struct strparser *strp); | |
43a0c675 TH |
53 | }; |
54 | ||
bbb03029 | 55 | struct strp_msg { |
43a0c675 TH |
56 | int full_len; |
57 | int offset; | |
58 | }; | |
59 | ||
bbb03029 | 60 | static inline struct strp_msg *strp_msg(struct sk_buff *skb) |
43a0c675 | 61 | { |
bbb03029 | 62 | return (struct strp_msg *)((void *)skb->cb + |
43a0c675 TH |
63 | offsetof(struct qdisc_skb_cb, data)); |
64 | } | |
65 | ||
66 | /* Structure for an attached lower socket */ | |
67 | struct strparser { | |
68 | struct sock *sk; | |
69 | ||
bbb03029 TH |
70 | u32 stopped : 1; |
71 | u32 paused : 1; | |
72 | u32 aborted : 1; | |
73 | u32 interrupted : 1; | |
74 | u32 unrecov_intr : 1; | |
75 | ||
76 | struct sk_buff **skb_nextp; | |
77 | struct timer_list msg_timer; | |
78 | struct sk_buff *skb_head; | |
79 | unsigned int need_bytes; | |
80 | struct delayed_work delayed_work; | |
81 | struct work_struct work; | |
43a0c675 TH |
82 | struct strp_stats stats; |
83 | struct strp_callbacks cb; | |
84 | }; | |
85 | ||
86 | /* Must be called with lock held for attached socket */ | |
87 | static inline void strp_pause(struct strparser *strp) | |
88 | { | |
bbb03029 | 89 | strp->paused = 1; |
43a0c675 TH |
90 | } |
91 | ||
92 | /* May be called without holding lock for attached socket */ | |
cff6a334 | 93 | void strp_unpause(struct strparser *strp); |
43a0c675 TH |
94 | |
95 | static inline void save_strp_stats(struct strparser *strp, | |
96 | struct strp_aggr_stats *agg_stats) | |
97 | { | |
98 | /* Save psock statistics in the mux when psock is being unattached. */ | |
99 | ||
100 | #define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += \ | |
101 | strp->stats._stat) | |
bbb03029 TH |
102 | SAVE_PSOCK_STATS(msgs); |
103 | SAVE_PSOCK_STATS(bytes); | |
104 | SAVE_PSOCK_STATS(mem_fail); | |
105 | SAVE_PSOCK_STATS(need_more_hdr); | |
106 | SAVE_PSOCK_STATS(msg_too_big); | |
107 | SAVE_PSOCK_STATS(msg_timeouts); | |
108 | SAVE_PSOCK_STATS(bad_hdr_len); | |
43a0c675 TH |
109 | #undef SAVE_PSOCK_STATS |
110 | ||
bbb03029 TH |
111 | if (strp->aborted) |
112 | agg_stats->aborts++; | |
113 | if (strp->interrupted) | |
114 | agg_stats->interrupted++; | |
115 | if (strp->unrecov_intr) | |
116 | agg_stats->unrecov_intr++; | |
43a0c675 TH |
117 | } |
118 | ||
119 | static inline void aggregate_strp_stats(struct strp_aggr_stats *stats, | |
120 | struct strp_aggr_stats *agg_stats) | |
121 | { | |
122 | #define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat) | |
bbb03029 TH |
123 | SAVE_PSOCK_STATS(msgs); |
124 | SAVE_PSOCK_STATS(bytes); | |
125 | SAVE_PSOCK_STATS(mem_fail); | |
126 | SAVE_PSOCK_STATS(need_more_hdr); | |
127 | SAVE_PSOCK_STATS(msg_too_big); | |
128 | SAVE_PSOCK_STATS(msg_timeouts); | |
129 | SAVE_PSOCK_STATS(bad_hdr_len); | |
130 | SAVE_PSOCK_STATS(aborts); | |
131 | SAVE_PSOCK_STATS(interrupted); | |
132 | SAVE_PSOCK_STATS(unrecov_intr); | |
43a0c675 TH |
133 | #undef SAVE_PSOCK_STATS |
134 | ||
135 | } | |
136 | ||
137 | void strp_done(struct strparser *strp); | |
138 | void strp_stop(struct strparser *strp); | |
139 | void strp_check_rcv(struct strparser *strp); | |
bbb03029 | 140 | int strp_init(struct strparser *strp, struct sock *sk, |
3fd87127 | 141 | const struct strp_callbacks *cb); |
96a59083 | 142 | void strp_data_ready(struct strparser *strp); |
bbb03029 TH |
143 | int strp_process(struct strparser *strp, struct sk_buff *orig_skb, |
144 | unsigned int orig_offset, size_t orig_len, | |
145 | size_t max_msg_size, long timeo); | |
43a0c675 TH |
146 | |
147 | #endif /* __NET_STRPARSER_H_ */ |