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1da177e4 LT |
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 | * | |
1da177e4 LT |
17 | */ |
18 | ||
19 | #ifndef _SNMP_H | |
20 | #define _SNMP_H | |
21 | ||
22 | #include <linux/cache.h> | |
23 | #include <linux/snmp.h> | |
d647b36a | 24 | #include <linux/smp.h> |
1da177e4 LT |
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 | */ | |
34 | struct snmp_mib { | |
5833929c | 35 | const char *name; |
1da177e4 LT |
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 | /* | |
4ce3c183 | 50 | * We use unsigned longs for most mibs but u64 for ipstats. |
1da177e4 | 51 | */ |
4ce3c183 | 52 | #include <linux/u64_stats_sync.h> |
1da177e4 | 53 | |
1da177e4 LT |
54 | /* IPstats */ |
55 | #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX | |
56 | struct ipstats_mib { | |
4ce3c183 ED |
57 | /* mibs[] must be first field of struct ipstats_mib */ |
58 | u64 mibs[IPSTATS_MIB_MAX]; | |
59 | struct u64_stats_sync syncp; | |
ec733b15 | 60 | }; |
1da177e4 LT |
61 | |
62 | /* ICMP */ | |
63 | #define ICMP_MIB_DUMMY __ICMP_MIB_MAX | |
64 | #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1) | |
65 | ||
66 | struct icmp_mib { | |
67 | unsigned long mibs[ICMP_MIB_MAX]; | |
ec733b15 | 68 | }; |
1da177e4 | 69 | |
96793b48 DS |
70 | #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX |
71 | struct icmpmsg_mib { | |
72 | unsigned long mibs[ICMPMSG_MIB_MAX]; | |
ec733b15 | 73 | }; |
96793b48 | 74 | |
1da177e4 LT |
75 | /* ICMP6 (IPv6-ICMP) */ |
76 | #define ICMP6_MIB_MAX __ICMP6_MIB_MAX | |
77 | struct icmpv6_mib { | |
78 | unsigned long mibs[ICMP6_MIB_MAX]; | |
ec733b15 | 79 | }; |
1da177e4 | 80 | |
14878f75 DS |
81 | #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX |
82 | struct icmpv6msg_mib { | |
83 | unsigned long mibs[ICMP6MSG_MIB_MAX]; | |
ec733b15 | 84 | }; |
14878f75 DS |
85 | |
86 | ||
1da177e4 LT |
87 | /* TCP */ |
88 | #define TCP_MIB_MAX __TCP_MIB_MAX | |
89 | struct tcp_mib { | |
90 | unsigned long mibs[TCP_MIB_MAX]; | |
ec733b15 | 91 | }; |
1da177e4 LT |
92 | |
93 | /* UDP */ | |
94 | #define UDP_MIB_MAX __UDP_MIB_MAX | |
95 | struct udp_mib { | |
96 | unsigned long mibs[UDP_MIB_MAX]; | |
ec733b15 | 97 | }; |
1da177e4 | 98 | |
1da177e4 LT |
99 | /* Linux */ |
100 | #define LINUX_MIB_MAX __LINUX_MIB_MAX | |
101 | struct linux_mib { | |
102 | unsigned long mibs[LINUX_MIB_MAX]; | |
103 | }; | |
104 | ||
558f82ef MN |
105 | /* Linux Xfrm */ |
106 | #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX | |
107 | struct linux_xfrm_mib { | |
108 | unsigned long mibs[LINUX_MIB_XFRMMAX]; | |
109 | }; | |
1da177e4 LT |
110 | |
111 | /* | |
112 | * FIXME: On x86 and some other CPUs the split into user and softirq parts | |
113 | * is not needed because addl $1,memory is atomic against interrupts (but | |
114 | * atomic_inc would be overkill because of the lock cycles). Wants new | |
115 | * nonlocked_atomic_inc() primitives -AK | |
116 | */ | |
117 | #define DEFINE_SNMP_STAT(type, name) \ | |
7d720c3e | 118 | __typeof__(type) __percpu *name[2] |
1da177e4 | 119 | #define DECLARE_SNMP_STAT(type, name) \ |
7d720c3e | 120 | extern __typeof__(type) __percpu *name[2] |
1da177e4 LT |
121 | |
122 | #define SNMP_STAT_BHPTR(name) (name[0]) | |
123 | #define SNMP_STAT_USRPTR(name) (name[1]) | |
124 | ||
4eb41d10 CL |
125 | #define SNMP_INC_STATS_BH(mib, field) \ |
126 | __this_cpu_inc(mib[0]->mibs[field]) | |
127 | #define SNMP_INC_STATS_USER(mib, field) \ | |
128 | this_cpu_inc(mib[1]->mibs[field]) | |
129 | #define SNMP_INC_STATS(mib, field) \ | |
130 | this_cpu_inc(mib[!in_softirq()]->mibs[field]) | |
131 | #define SNMP_DEC_STATS(mib, field) \ | |
132 | this_cpu_dec(mib[!in_softirq()]->mibs[field]) | |
133 | #define SNMP_ADD_STATS_BH(mib, field, addend) \ | |
134 | __this_cpu_add(mib[0]->mibs[field], addend) | |
135 | #define SNMP_ADD_STATS_USER(mib, field, addend) \ | |
136 | this_cpu_add(mib[1]->mibs[field], addend) | |
aa2ea058 | 137 | #define SNMP_ADD_STATS(mib, field, addend) \ |
8f1c14b2 | 138 | this_cpu_add(mib[!in_softirq()]->mibs[field], addend) |
7d720c3e TH |
139 | /* |
140 | * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr" | |
141 | * to make @ptr a non-percpu pointer. | |
142 | */ | |
edf391ff NH |
143 | #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ |
144 | do { \ | |
7d720c3e | 145 | __typeof__(*mib[0]) *ptr; \ |
4eb41d10 CL |
146 | preempt_disable(); \ |
147 | ptr = this_cpu_ptr((mib)[!in_softirq()]); \ | |
edf391ff NH |
148 | ptr->mibs[basefield##PKTS]++; \ |
149 | ptr->mibs[basefield##OCTETS] += addend;\ | |
4eb41d10 | 150 | preempt_enable(); \ |
edf391ff NH |
151 | } while (0) |
152 | #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \ | |
153 | do { \ | |
7d720c3e | 154 | __typeof__(*mib[0]) *ptr = \ |
4eb41d10 | 155 | __this_cpu_ptr((mib)[!in_softirq()]); \ |
edf391ff NH |
156 | ptr->mibs[basefield##PKTS]++; \ |
157 | ptr->mibs[basefield##OCTETS] += addend;\ | |
158 | } while (0) | |
4ce3c183 ED |
159 | |
160 | ||
161 | #if BITS_PER_LONG==32 | |
162 | ||
163 | #define SNMP_ADD_STATS64_BH(mib, field, addend) \ | |
164 | do { \ | |
165 | __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \ | |
166 | u64_stats_update_begin(&ptr->syncp); \ | |
167 | ptr->mibs[field] += addend; \ | |
168 | u64_stats_update_end(&ptr->syncp); \ | |
169 | } while (0) | |
170 | #define SNMP_ADD_STATS64_USER(mib, field, addend) \ | |
171 | do { \ | |
172 | __typeof__(*mib[0]) *ptr; \ | |
173 | preempt_disable(); \ | |
174 | ptr = __this_cpu_ptr((mib)[1]); \ | |
175 | u64_stats_update_begin(&ptr->syncp); \ | |
176 | ptr->mibs[field] += addend; \ | |
177 | u64_stats_update_end(&ptr->syncp); \ | |
178 | preempt_enable(); \ | |
179 | } while (0) | |
180 | #define SNMP_ADD_STATS64(mib, field, addend) \ | |
181 | do { \ | |
182 | __typeof__(*mib[0]) *ptr; \ | |
183 | preempt_disable(); \ | |
184 | ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ | |
185 | u64_stats_update_begin(&ptr->syncp); \ | |
186 | ptr->mibs[field] += addend; \ | |
187 | u64_stats_update_end(&ptr->syncp); \ | |
188 | preempt_enable(); \ | |
189 | } while (0) | |
190 | #define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1) | |
191 | #define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1) | |
192 | #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1) | |
193 | #define SNMP_UPD_PO_STATS64(mib, basefield, addend) \ | |
194 | do { \ | |
195 | __typeof__(*mib[0]) *ptr; \ | |
196 | preempt_disable(); \ | |
197 | ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ | |
198 | u64_stats_update_begin(&ptr->syncp); \ | |
199 | ptr->mibs[basefield##PKTS]++; \ | |
200 | ptr->mibs[basefield##OCTETS] += addend; \ | |
201 | u64_stats_update_end(&ptr->syncp); \ | |
202 | preempt_enable(); \ | |
203 | } while (0) | |
204 | #define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \ | |
205 | do { \ | |
206 | __typeof__(*mib[0]) *ptr; \ | |
207 | ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ | |
208 | u64_stats_update_begin(&ptr->syncp); \ | |
209 | ptr->mibs[basefield##PKTS]++; \ | |
210 | ptr->mibs[basefield##OCTETS] += addend; \ | |
211 | u64_stats_update_end(&ptr->syncp); \ | |
212 | } while (0) | |
213 | #else | |
214 | #define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field) | |
215 | #define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field) | |
216 | #define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field) | |
217 | #define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field) | |
218 | #define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend) | |
219 | #define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend) | |
220 | #define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend) | |
221 | #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend) | |
222 | #define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend) | |
223 | #endif | |
224 | ||
1da177e4 | 225 | #endif |