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Linux kernel mirror (for testing)
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linux
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 unsigned long mibs[ICMPMSG_MIB_MAX];
71};
72
73/* ICMP6 (IPv6-ICMP) */
74#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
75struct icmpv6_mib {
76 unsigned long mibs[ICMP6_MIB_MAX];
77};
78
79#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
80struct icmpv6msg_mib {
81 unsigned long mibs[ICMP6MSG_MIB_MAX];
82};
83
84
85/* TCP */
86#define TCP_MIB_MAX __TCP_MIB_MAX
87struct tcp_mib {
88 unsigned long mibs[TCP_MIB_MAX];
89};
90
91/* UDP */
92#define UDP_MIB_MAX __UDP_MIB_MAX
93struct udp_mib {
94 unsigned long mibs[UDP_MIB_MAX];
95};
96
97/* Linux */
98#define LINUX_MIB_MAX __LINUX_MIB_MAX
99struct linux_mib {
100 unsigned long mibs[LINUX_MIB_MAX];
101};
102
103/* Linux Xfrm */
104#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
105struct linux_xfrm_mib {
106 unsigned long mibs[LINUX_MIB_XFRMMAX];
107};
108
109/*
110 * FIXME: On x86 and some other CPUs the split into user and softirq parts
111 * is not needed because addl $1,memory is atomic against interrupts (but
112 * atomic_inc would be overkill because of the lock cycles). Wants new
113 * nonlocked_atomic_inc() primitives -AK
114 */
115#define DEFINE_SNMP_STAT(type, name) \
116 __typeof__(type) __percpu *name[2]
117#define DECLARE_SNMP_STAT(type, name) \
118 extern __typeof__(type) __percpu *name[2]
119
120#define SNMP_STAT_BHPTR(name) (name[0])
121#define SNMP_STAT_USRPTR(name) (name[1])
122
123#define SNMP_INC_STATS_BH(mib, field) \
124 __this_cpu_inc(mib[0]->mibs[field])
125#define SNMP_INC_STATS_USER(mib, field) \
126 this_cpu_inc(mib[1]->mibs[field])
127#define SNMP_INC_STATS(mib, field) \
128 this_cpu_inc(mib[!in_softirq()]->mibs[field])
129#define SNMP_DEC_STATS(mib, field) \
130 this_cpu_dec(mib[!in_softirq()]->mibs[field])
131#define SNMP_ADD_STATS_BH(mib, field, addend) \
132 __this_cpu_add(mib[0]->mibs[field], addend)
133#define SNMP_ADD_STATS_USER(mib, field, addend) \
134 this_cpu_add(mib[1]->mibs[field], addend)
135#define SNMP_ADD_STATS(mib, field, addend) \
136 this_cpu_add(mib[!in_softirq()]->mibs[field], addend)
137/*
138 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
139 * to make @ptr a non-percpu pointer.
140 */
141#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
142 do { \
143 __typeof__(*mib[0]) *ptr; \
144 preempt_disable(); \
145 ptr = this_cpu_ptr((mib)[!in_softirq()]); \
146 ptr->mibs[basefield##PKTS]++; \
147 ptr->mibs[basefield##OCTETS] += addend;\
148 preempt_enable(); \
149 } while (0)
150#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
151 do { \
152 __typeof__(*mib[0]) *ptr = \
153 __this_cpu_ptr((mib)[0]); \
154 ptr->mibs[basefield##PKTS]++; \
155 ptr->mibs[basefield##OCTETS] += addend;\
156 } while (0)
157
158
159#if BITS_PER_LONG==32
160
161#define SNMP_ADD_STATS64_BH(mib, field, addend) \
162 do { \
163 __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \
164 u64_stats_update_begin(&ptr->syncp); \
165 ptr->mibs[field] += addend; \
166 u64_stats_update_end(&ptr->syncp); \
167 } while (0)
168#define SNMP_ADD_STATS64_USER(mib, field, addend) \
169 do { \
170 __typeof__(*mib[0]) *ptr; \
171 preempt_disable(); \
172 ptr = __this_cpu_ptr((mib)[1]); \
173 u64_stats_update_begin(&ptr->syncp); \
174 ptr->mibs[field] += addend; \
175 u64_stats_update_end(&ptr->syncp); \
176 preempt_enable(); \
177 } while (0)
178#define SNMP_ADD_STATS64(mib, field, addend) \
179 do { \
180 __typeof__(*mib[0]) *ptr; \
181 preempt_disable(); \
182 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
183 u64_stats_update_begin(&ptr->syncp); \
184 ptr->mibs[field] += addend; \
185 u64_stats_update_end(&ptr->syncp); \
186 preempt_enable(); \
187 } while (0)
188#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
189#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
190#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
191#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
192 do { \
193 __typeof__(*mib[0]) *ptr; \
194 preempt_disable(); \
195 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
196 u64_stats_update_begin(&ptr->syncp); \
197 ptr->mibs[basefield##PKTS]++; \
198 ptr->mibs[basefield##OCTETS] += addend; \
199 u64_stats_update_end(&ptr->syncp); \
200 preempt_enable(); \
201 } while (0)
202#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
203 do { \
204 __typeof__(*mib[0]) *ptr; \
205 ptr = __this_cpu_ptr((mib)[0]); \
206 u64_stats_update_begin(&ptr->syncp); \
207 ptr->mibs[basefield##PKTS]++; \
208 ptr->mibs[basefield##OCTETS] += addend; \
209 u64_stats_update_end(&ptr->syncp); \
210 } while (0)
211#else
212#define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
213#define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
214#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
215#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
216#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
217#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
218#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
219#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
220#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)
221#endif
222
223#endif