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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
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 unsigned long 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/*
120 * FIXME: On x86 and some other CPUs the split into user and softirq parts
121 * is not needed because addl $1,memory is atomic against interrupts (but
122 * atomic_inc would be overkill because of the lock cycles). Wants new
123 * nonlocked_atomic_inc() primitives -AK
124 */
125#define DEFINE_SNMP_STAT(type, name) \
126 __typeof__(type) __percpu *name[2]
127#define DEFINE_SNMP_STAT_ATOMIC(type, name) \
128 __typeof__(type) *name
129#define DECLARE_SNMP_STAT(type, name) \
130 extern __typeof__(type) __percpu *name[2]
131
132#define SNMP_STAT_BHPTR(name) (name[0])
133#define SNMP_STAT_USRPTR(name) (name[1])
134
135#define SNMP_INC_STATS_BH(mib, field) \
136 __this_cpu_inc(mib[0]->mibs[field])
137#define SNMP_INC_STATS_USER(mib, field) \
138 this_cpu_inc(mib[1]->mibs[field])
139#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
140 atomic_long_inc(&mib->mibs[field])
141#define SNMP_INC_STATS(mib, field) \
142 this_cpu_inc(mib[!in_softirq()]->mibs[field])
143#define SNMP_DEC_STATS(mib, field) \
144 this_cpu_dec(mib[!in_softirq()]->mibs[field])
145#define SNMP_ADD_STATS_BH(mib, field, addend) \
146 __this_cpu_add(mib[0]->mibs[field], addend)
147#define SNMP_ADD_STATS_USER(mib, field, addend) \
148 this_cpu_add(mib[1]->mibs[field], addend)
149#define SNMP_ADD_STATS(mib, field, addend) \
150 this_cpu_add(mib[!in_softirq()]->mibs[field], addend)
151/*
152 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
153 * to make @ptr a non-percpu pointer.
154 */
155#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
156 do { \
157 __typeof__(*mib[0]) *ptr; \
158 preempt_disable(); \
159 ptr = this_cpu_ptr((mib)[!in_softirq()]); \
160 ptr->mibs[basefield##PKTS]++; \
161 ptr->mibs[basefield##OCTETS] += addend;\
162 preempt_enable(); \
163 } while (0)
164#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
165 do { \
166 __typeof__(*mib[0]) *ptr = \
167 __this_cpu_ptr((mib)[0]); \
168 ptr->mibs[basefield##PKTS]++; \
169 ptr->mibs[basefield##OCTETS] += addend;\
170 } while (0)
171
172
173#if BITS_PER_LONG==32
174
175#define SNMP_ADD_STATS64_BH(mib, field, addend) \
176 do { \
177 __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \
178 u64_stats_update_begin(&ptr->syncp); \
179 ptr->mibs[field] += addend; \
180 u64_stats_update_end(&ptr->syncp); \
181 } while (0)
182#define SNMP_ADD_STATS64_USER(mib, field, addend) \
183 do { \
184 __typeof__(*mib[0]) *ptr; \
185 preempt_disable(); \
186 ptr = __this_cpu_ptr((mib)[1]); \
187 u64_stats_update_begin(&ptr->syncp); \
188 ptr->mibs[field] += addend; \
189 u64_stats_update_end(&ptr->syncp); \
190 preempt_enable(); \
191 } while (0)
192#define SNMP_ADD_STATS64(mib, field, addend) \
193 do { \
194 __typeof__(*mib[0]) *ptr; \
195 preempt_disable(); \
196 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
197 u64_stats_update_begin(&ptr->syncp); \
198 ptr->mibs[field] += addend; \
199 u64_stats_update_end(&ptr->syncp); \
200 preempt_enable(); \
201 } while (0)
202#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
203#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
204#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
205#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
206 do { \
207 __typeof__(*mib[0]) *ptr; \
208 preempt_disable(); \
209 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
210 u64_stats_update_begin(&ptr->syncp); \
211 ptr->mibs[basefield##PKTS]++; \
212 ptr->mibs[basefield##OCTETS] += addend; \
213 u64_stats_update_end(&ptr->syncp); \
214 preempt_enable(); \
215 } while (0)
216#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
217 do { \
218 __typeof__(*mib[0]) *ptr; \
219 ptr = __this_cpu_ptr((mib)[0]); \
220 u64_stats_update_begin(&ptr->syncp); \
221 ptr->mibs[basefield##PKTS]++; \
222 ptr->mibs[basefield##OCTETS] += addend; \
223 u64_stats_update_end(&ptr->syncp); \
224 } while (0)
225#else
226#define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
227#define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
228#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
229#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
230#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
231#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
232#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
233#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
234#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)
235#endif
236
237#endif