1/*
2 *
3 * SNMP MIB entries for the IP subsystem.
4 *
5 * Alan Cox <gw4pts@gw4pts.ampr.org>
6 *
7 * We don't chose to implement SNMP in the kernel (this would
8 * be silly as SNMP is a pain in the backside in places). We do
9 * however need to collect the MIB statistics and export them
10 * out of /proc (eventually)
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 */
18
19#ifndef _SNMP_H
20#define _SNMP_H
21
22#include <linux/cache.h>
23#include <linux/snmp.h>
24#include <linux/smp.h>
25
26/*
27 * Mibs are stored in array of unsigned long.
28 */
29/*
30 * struct snmp_mib{}
31 * - list of entries for particular API (such as /proc/net/snmp)
32 * - name of entries.
33 */
34struct snmp_mib {
35 const char *name;
36 int entry;
37};
38
39#define SNMP_MIB_ITEM(_name,_entry) { \
40 .name = _name, \
41 .entry = _entry, \
42}
43
44#define SNMP_MIB_SENTINEL { \
45 .name = NULL, \
46 .entry = 0, \
47}
48
49/*
50 * We use unsigned longs for most mibs but u64 for ipstats.
51 */
52#include <linux/u64_stats_sync.h>
53
54/* IPstats */
55#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
56struct ipstats_mib {
57 /* mibs[] must be first field of struct ipstats_mib */
58 u64 mibs[IPSTATS_MIB_MAX];
59 struct u64_stats_sync syncp;
60};
61
62/* ICMP */
63#define ICMP_MIB_MAX __ICMP_MIB_MAX
64struct icmp_mib {
65 unsigned long mibs[ICMP_MIB_MAX];
66};
67
68#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
69struct icmpmsg_mib {
70 atomic_long_t mibs[ICMPMSG_MIB_MAX];
71};
72
73/* ICMP6 (IPv6-ICMP) */
74#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
75/* per network ns counters */
76struct icmpv6_mib {
77 unsigned long mibs[ICMP6_MIB_MAX];
78};
79/* per device counters, (shared on all cpus) */
80struct icmpv6_mib_device {
81 atomic_long_t mibs[ICMP6_MIB_MAX];
82};
83
84#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
85/* per network ns counters */
86struct icmpv6msg_mib {
87 atomic_long_t mibs[ICMP6MSG_MIB_MAX];
88};
89/* per device counters, (shared on all cpus) */
90struct icmpv6msg_mib_device {
91 atomic_long_t mibs[ICMP6MSG_MIB_MAX];
92};
93
94
95/* TCP */
96#define TCP_MIB_MAX __TCP_MIB_MAX
97struct tcp_mib {
98 unsigned long mibs[TCP_MIB_MAX];
99};
100
101/* UDP */
102#define UDP_MIB_MAX __UDP_MIB_MAX
103struct udp_mib {
104 unsigned long mibs[UDP_MIB_MAX];
105};
106
107/* Linux */
108#define LINUX_MIB_MAX __LINUX_MIB_MAX
109struct linux_mib {
110 unsigned long mibs[LINUX_MIB_MAX];
111};
112
113/* Linux Xfrm */
114#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
115struct linux_xfrm_mib {
116 unsigned long mibs[LINUX_MIB_XFRMMAX];
117};
118
119#define DEFINE_SNMP_STAT(type, name) \
120 __typeof__(type) __percpu *name
121#define DEFINE_SNMP_STAT_ATOMIC(type, name) \
122 __typeof__(type) *name
123#define DECLARE_SNMP_STAT(type, name) \
124 extern __typeof__(type) __percpu *name
125
126#define __SNMP_INC_STATS(mib, field) \
127 __this_cpu_inc(mib->mibs[field])
128
129#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
130 atomic_long_inc(&mib->mibs[field])
131
132#define SNMP_INC_STATS(mib, field) \
133 this_cpu_inc(mib->mibs[field])
134
135#define SNMP_DEC_STATS(mib, field) \
136 this_cpu_dec(mib->mibs[field])
137
138#define __SNMP_ADD_STATS(mib, field, addend) \
139 __this_cpu_add(mib->mibs[field], addend)
140
141#define SNMP_ADD_STATS(mib, field, addend) \
142 this_cpu_add(mib->mibs[field], addend)
143#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
144 do { \
145 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \
146 this_cpu_inc(ptr[basefield##PKTS]); \
147 this_cpu_add(ptr[basefield##OCTETS], addend); \
148 } while (0)
149#define __SNMP_UPD_PO_STATS(mib, basefield, addend) \
150 do { \
151 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \
152 __this_cpu_inc(ptr[basefield##PKTS]); \
153 __this_cpu_add(ptr[basefield##OCTETS], addend); \
154 } while (0)
155
156
157#if BITS_PER_LONG==32
158
159#define __SNMP_ADD_STATS64(mib, field, addend) \
160 do { \
161 __typeof__(*mib) *ptr = raw_cpu_ptr(mib); \
162 u64_stats_update_begin(&ptr->syncp); \
163 ptr->mibs[field] += addend; \
164 u64_stats_update_end(&ptr->syncp); \
165 } while (0)
166
167#define SNMP_ADD_STATS64(mib, field, addend) \
168 do { \
169 local_bh_disable(); \
170 __SNMP_ADD_STATS64(mib, field, addend); \
171 local_bh_enable(); \
172 } while (0)
173
174#define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
175#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
176#define __SNMP_UPD_PO_STATS64(mib, basefield, addend) \
177 do { \
178 __typeof__(*mib) *ptr; \
179 ptr = raw_cpu_ptr((mib)); \
180 u64_stats_update_begin(&ptr->syncp); \
181 ptr->mibs[basefield##PKTS]++; \
182 ptr->mibs[basefield##OCTETS] += addend; \
183 u64_stats_update_end(&ptr->syncp); \
184 } while (0)
185#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
186 do { \
187 local_bh_disable(); \
188 __SNMP_UPD_PO_STATS64(mib, basefield, addend); \
189 local_bh_enable(); \
190 } while (0)
191#else
192#define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field)
193#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
194#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
195#define __SNMP_ADD_STATS64(mib, field, addend) __SNMP_ADD_STATS(mib, field, addend)
196#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
197#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
198#define __SNMP_UPD_PO_STATS64(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend)
199#endif
200
201#endif
202