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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *
4 * SNMP MIB entries for the IP subsystem.
5 *
6 * Alan Cox <gw4pts@gw4pts.ampr.org>
7 *
8 * We don't chose to implement SNMP in the kernel (this would
9 * be silly as SNMP is a pain in the backside in places). We do
10 * however need to collect the MIB statistics and export them
11 * out of /proc (eventually)
12 */
13
14#ifndef _SNMP_H
15#define _SNMP_H
16
17#include <linux/cache.h>
18#include <linux/snmp.h>
19#include <linux/smp.h>
20
21/*
22 * Mibs are stored in array of unsigned long.
23 */
24/*
25 * struct snmp_mib{}
26 * - list of entries for particular API (such as /proc/net/snmp)
27 * - name of entries.
28 */
29struct snmp_mib {
30 const char *name;
31 int entry;
32};
33
34#define SNMP_MIB_ITEM(_name,_entry) { \
35 .name = _name, \
36 .entry = _entry, \
37}
38
39#define SNMP_MIB_SENTINEL { \
40 .name = NULL, \
41 .entry = 0, \
42}
43
44/*
45 * We use unsigned longs for most mibs but u64 for ipstats.
46 */
47#include <linux/u64_stats_sync.h>
48
49/* IPstats */
50#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
51struct ipstats_mib {
52 /* mibs[] must be first field of struct ipstats_mib */
53 u64 mibs[IPSTATS_MIB_MAX];
54 struct u64_stats_sync syncp;
55};
56
57/* ICMP */
58#define ICMP_MIB_MAX __ICMP_MIB_MAX
59struct icmp_mib {
60 unsigned long mibs[ICMP_MIB_MAX];
61};
62
63#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
64struct icmpmsg_mib {
65 atomic_long_t mibs[ICMPMSG_MIB_MAX];
66};
67
68/* ICMP6 (IPv6-ICMP) */
69#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
70/* per network ns counters */
71struct icmpv6_mib {
72 unsigned long mibs[ICMP6_MIB_MAX];
73};
74/* per device counters, (shared on all cpus) */
75struct icmpv6_mib_device {
76 atomic_long_t mibs[ICMP6_MIB_MAX];
77};
78
79#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
80/* per network ns counters */
81struct icmpv6msg_mib {
82 atomic_long_t mibs[ICMP6MSG_MIB_MAX];
83};
84/* per device counters, (shared on all cpus) */
85struct icmpv6msg_mib_device {
86 atomic_long_t mibs[ICMP6MSG_MIB_MAX];
87};
88
89
90/* TCP */
91#define TCP_MIB_MAX __TCP_MIB_MAX
92struct tcp_mib {
93 unsigned long mibs[TCP_MIB_MAX];
94};
95
96/* UDP */
97#define UDP_MIB_MAX __UDP_MIB_MAX
98struct udp_mib {
99 unsigned long mibs[UDP_MIB_MAX];
100};
101
102/* Linux */
103#define LINUX_MIB_MAX __LINUX_MIB_MAX
104struct linux_mib {
105 unsigned long mibs[LINUX_MIB_MAX];
106};
107
108/* Linux Xfrm */
109#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
110struct linux_xfrm_mib {
111 unsigned long mibs[LINUX_MIB_XFRMMAX];
112};
113
114#define DEFINE_SNMP_STAT(type, name) \
115 __typeof__(type) __percpu *name
116#define DEFINE_SNMP_STAT_ATOMIC(type, name) \
117 __typeof__(type) *name
118#define DECLARE_SNMP_STAT(type, name) \
119 extern __typeof__(type) __percpu *name
120
121#define __SNMP_INC_STATS(mib, field) \
122 __this_cpu_inc(mib->mibs[field])
123
124#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
125 atomic_long_inc(&mib->mibs[field])
126
127#define SNMP_INC_STATS(mib, field) \
128 this_cpu_inc(mib->mibs[field])
129
130#define SNMP_DEC_STATS(mib, field) \
131 this_cpu_dec(mib->mibs[field])
132
133#define __SNMP_ADD_STATS(mib, field, addend) \
134 __this_cpu_add(mib->mibs[field], addend)
135
136#define SNMP_ADD_STATS(mib, field, addend) \
137 this_cpu_add(mib->mibs[field], addend)
138#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
139 do { \
140 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \
141 this_cpu_inc(ptr[basefield##PKTS]); \
142 this_cpu_add(ptr[basefield##OCTETS], addend); \
143 } while (0)
144#define __SNMP_UPD_PO_STATS(mib, basefield, addend) \
145 do { \
146 __typeof__((mib->mibs) + 0) ptr = mib->mibs; \
147 __this_cpu_inc(ptr[basefield##PKTS]); \
148 __this_cpu_add(ptr[basefield##OCTETS], addend); \
149 } while (0)
150
151
152#if BITS_PER_LONG==32
153
154#define __SNMP_ADD_STATS64(mib, field, addend) \
155 do { \
156 __typeof__(*mib) *ptr = raw_cpu_ptr(mib); \
157 u64_stats_update_begin(&ptr->syncp); \
158 ptr->mibs[field] += addend; \
159 u64_stats_update_end(&ptr->syncp); \
160 } while (0)
161
162#define SNMP_ADD_STATS64(mib, field, addend) \
163 do { \
164 local_bh_disable(); \
165 __SNMP_ADD_STATS64(mib, field, addend); \
166 local_bh_enable(); \
167 } while (0)
168
169#define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
170#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
171#define __SNMP_UPD_PO_STATS64(mib, basefield, addend) \
172 do { \
173 __typeof__(*mib) *ptr; \
174 ptr = raw_cpu_ptr((mib)); \
175 u64_stats_update_begin(&ptr->syncp); \
176 ptr->mibs[basefield##PKTS]++; \
177 ptr->mibs[basefield##OCTETS] += addend; \
178 u64_stats_update_end(&ptr->syncp); \
179 } while (0)
180#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
181 do { \
182 local_bh_disable(); \
183 __SNMP_UPD_PO_STATS64(mib, basefield, addend); \
184 local_bh_enable(); \
185 } while (0)
186#else
187#define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field)
188#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
189#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
190#define __SNMP_ADD_STATS64(mib, field, addend) __SNMP_ADD_STATS(mib, field, addend)
191#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
192#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
193#define __SNMP_UPD_PO_STATS64(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend)
194#endif
195
196#endif