projects/linux·blob v4.12-rc2 · refs

142 lines · 3.7 KiB

1/*
2 * Stream Parser
3 *
4 * Copyright (c) 2016 Tom Herbert <[email protected]>
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
20struct strp_stats {
21 unsigned long long rx_msgs;
22 unsigned long long rx_bytes;
23 unsigned int rx_mem_fail;
24 unsigned int rx_need_more_hdr;
25 unsigned int rx_msg_too_big;
26 unsigned int rx_msg_timeouts;
27 unsigned int rx_bad_hdr_len;
28};
29
30struct strp_aggr_stats {
31 unsigned long long rx_msgs;
32 unsigned long long rx_bytes;
33 unsigned int rx_mem_fail;
34 unsigned int rx_need_more_hdr;
35 unsigned int rx_msg_too_big;
36 unsigned int rx_msg_timeouts;
37 unsigned int rx_bad_hdr_len;
38 unsigned int rx_aborts;
39 unsigned int rx_interrupted;
40 unsigned int rx_unrecov_intr;
41};
42
43struct strparser;
44
45/* Callbacks are called with lock held for the attached socket */
46struct 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);
51};
52
53struct strp_rx_msg {
54 int full_len;
55 int offset;
56};
57
58static inline struct strp_rx_msg *strp_rx_msg(struct sk_buff *skb)
59{
60 return (struct strp_rx_msg *)((void *)skb->cb +
61 offsetof(struct qdisc_skb_cb, data));
62}
63
64/* Structure for an attached lower socket */
65struct strparser {
66 struct sock *sk;
67
68 u32 rx_stopped : 1;
69 u32 rx_paused : 1;
70 u32 rx_aborted : 1;
71 u32 rx_interrupted : 1;
72 u32 rx_unrecov_intr : 1;
73
74 struct sk_buff **rx_skb_nextp;
75 struct timer_list rx_msg_timer;
76 struct sk_buff *rx_skb_head;
77 unsigned int rx_need_bytes;
78 struct delayed_work rx_delayed_work;
79 struct work_struct rx_work;
80 struct strp_stats stats;
81 struct strp_callbacks cb;
82};
83
84/* Must be called with lock held for attached socket */
85static inline void strp_pause(struct strparser *strp)
86{
87 strp->rx_paused = 1;
88}
89
90/* May be called without holding lock for attached socket */
91void strp_unpause(struct strparser *strp);
92
93static inline void save_strp_stats(struct strparser *strp,
94 struct strp_aggr_stats *agg_stats)
95{
96 /* Save psock statistics in the mux when psock is being unattached. */
97
98#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += \
99 strp->stats._stat)
100 SAVE_PSOCK_STATS(rx_msgs);
101 SAVE_PSOCK_STATS(rx_bytes);
102 SAVE_PSOCK_STATS(rx_mem_fail);
103 SAVE_PSOCK_STATS(rx_need_more_hdr);
104 SAVE_PSOCK_STATS(rx_msg_too_big);
105 SAVE_PSOCK_STATS(rx_msg_timeouts);
106 SAVE_PSOCK_STATS(rx_bad_hdr_len);
107#undef SAVE_PSOCK_STATS
108
109 if (strp->rx_aborted)
110 agg_stats->rx_aborts++;
111 if (strp->rx_interrupted)
112 agg_stats->rx_interrupted++;
113 if (strp->rx_unrecov_intr)
114 agg_stats->rx_unrecov_intr++;
115}
116
117static inline void aggregate_strp_stats(struct strp_aggr_stats *stats,
118 struct strp_aggr_stats *agg_stats)
119{
120#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
121 SAVE_PSOCK_STATS(rx_msgs);
122 SAVE_PSOCK_STATS(rx_bytes);
123 SAVE_PSOCK_STATS(rx_mem_fail);
124 SAVE_PSOCK_STATS(rx_need_more_hdr);
125 SAVE_PSOCK_STATS(rx_msg_too_big);
126 SAVE_PSOCK_STATS(rx_msg_timeouts);
127 SAVE_PSOCK_STATS(rx_bad_hdr_len);
128 SAVE_PSOCK_STATS(rx_aborts);
129 SAVE_PSOCK_STATS(rx_interrupted);
130 SAVE_PSOCK_STATS(rx_unrecov_intr);
131#undef SAVE_PSOCK_STATS
132
133}
134
135void strp_done(struct strparser *strp);
136void strp_stop(struct strparser *strp);
137void strp_check_rcv(struct strparser *strp);
138int strp_init(struct strparser *strp, struct sock *csk,
139 struct strp_callbacks *cb);
140void strp_data_ready(struct strparser *strp);
141
142#endif /* __NET_STRPARSER_H_ */