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 | */ |
29 | struct 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 |
51 | struct 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 |
59 | struct icmp_mib { |
60 | unsigned long mibs[ICMP_MIB_MAX]; |
61 | }; |
62 | |
63 | #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX |
64 | struct 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 */ |
71 | struct icmpv6_mib { |
72 | unsigned long mibs[ICMP6_MIB_MAX]; |
73 | }; |
74 | /* per device counters, (shared on all cpus) */ |
75 | struct 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 */ |
81 | struct icmpv6msg_mib { |
82 | atomic_long_t mibs[ICMP6MSG_MIB_MAX]; |
83 | }; |
84 | /* per device counters, (shared on all cpus) */ |
85 | struct icmpv6msg_mib_device { |
86 | atomic_long_t mibs[ICMP6MSG_MIB_MAX]; |
87 | }; |
88 | |
89 | |
90 | /* TCP */ |
91 | #define TCP_MIB_MAX __TCP_MIB_MAX |
92 | struct tcp_mib { |
93 | unsigned long mibs[TCP_MIB_MAX]; |
94 | }; |
95 | |
96 | /* UDP */ |
97 | #define UDP_MIB_MAX __UDP_MIB_MAX |
98 | struct udp_mib { |
99 | unsigned long mibs[UDP_MIB_MAX]; |
100 | }; |
101 | |
102 | /* Linux */ |
103 | #define LINUX_MIB_MAX __LINUX_MIB_MAX |
104 | struct linux_mib { |
105 | unsigned long mibs[LINUX_MIB_MAX]; |
106 | }; |
107 | |
108 | /* Linux Xfrm */ |
109 | #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX |
110 | struct linux_xfrm_mib { |
111 | unsigned long mibs[LINUX_MIB_XFRMMAX]; |
112 | }; |
113 | |
114 | /* Linux TLS */ |
115 | #define LINUX_MIB_TLSMAX __LINUX_MIB_TLSMAX |
116 | struct linux_tls_mib { |
117 | unsigned long mibs[LINUX_MIB_TLSMAX]; |
118 | }; |
119 | |
120 | #define DEFINE_SNMP_STAT(type, name) \ |
121 | __typeof__(type) __percpu *name |
122 | #define DEFINE_SNMP_STAT_ATOMIC(type, name) \ |
123 | __typeof__(type) *name |
124 | #define DECLARE_SNMP_STAT(type, name) \ |
125 | extern __typeof__(type) __percpu *name |
126 | |
127 | #define __SNMP_INC_STATS(mib, field) \ |
128 | __this_cpu_inc(mib->mibs[field]) |
129 | |
130 | #define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \ |
131 | atomic_long_inc(&mib->mibs[field]) |
132 | |
133 | #define SNMP_INC_STATS(mib, field) \ |
134 | this_cpu_inc(mib->mibs[field]) |
135 | |
136 | #define SNMP_DEC_STATS(mib, field) \ |
137 | this_cpu_dec(mib->mibs[field]) |
138 | |
139 | #define __SNMP_ADD_STATS(mib, field, addend) \ |
140 | __this_cpu_add(mib->mibs[field], addend) |
141 | |
142 | #define SNMP_ADD_STATS(mib, field, addend) \ |
143 | this_cpu_add(mib->mibs[field], addend) |
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 | #define __SNMP_UPD_PO_STATS(mib, basefield, addend) \ |
151 | do { \ |
152 | __typeof__((mib->mibs) + 0) ptr = mib->mibs; \ |
153 | __this_cpu_inc(ptr[basefield##PKTS]); \ |
154 | __this_cpu_add(ptr[basefield##OCTETS], addend); \ |
155 | } while (0) |
156 | |
157 | |
158 | #if BITS_PER_LONG==32 |
159 | |
160 | #define __SNMP_ADD_STATS64(mib, field, addend) \ |
161 | do { \ |
162 | __typeof__(*mib) *ptr = raw_cpu_ptr(mib); \ |
163 | u64_stats_update_begin(&ptr->syncp); \ |
164 | ptr->mibs[field] += addend; \ |
165 | u64_stats_update_end(&ptr->syncp); \ |
166 | } while (0) |
167 | |
168 | #define SNMP_ADD_STATS64(mib, field, addend) \ |
169 | do { \ |
170 | local_bh_disable(); \ |
171 | __SNMP_ADD_STATS64(mib, field, addend); \ |
172 | local_bh_enable(); \ |
173 | } while (0) |
174 | |
175 | #define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) |
176 | #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) |
177 | #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) \ |
178 | do { \ |
179 | __typeof__(*mib) *ptr; \ |
180 | ptr = raw_cpu_ptr((mib)); \ |
181 | u64_stats_update_begin(&ptr->syncp); \ |
182 | ptr->mibs[basefield##PKTS]++; \ |
183 | ptr->mibs[basefield##OCTETS] += addend; \ |
184 | u64_stats_update_end(&ptr->syncp); \ |
185 | } while (0) |
186 | #define SNMP_UPD_PO_STATS64(mib, basefield, addend) \ |
187 | do { \ |
188 | local_bh_disable(); \ |
189 | __SNMP_UPD_PO_STATS64(mib, basefield, addend); \ |
190 | local_bh_enable(); \ |
191 | } while (0) |
192 | #else |
193 | #define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field) |
194 | #define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field) |
195 | #define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field) |
196 | #define __SNMP_ADD_STATS64(mib, field, addend) __SNMP_ADD_STATS(mib, field, addend) |
197 | #define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend) |
198 | #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend) |
199 | #define __SNMP_UPD_PO_STATS64(mib, basefield, addend) __SNMP_UPD_PO_STATS(mib, basefield, addend) |
200 | #endif |
201 | |
202 | #endif |
203 | |