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snmp.h
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1 /*
2  *
3  * SNMP MIB entries for the IP subsystem.
4  *
5  * Alan Cox <[email protected]>
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  */
34 struct 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
56 struct 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
64 struct icmp_mib {
65  unsigned long mibs[ICMP_MIB_MAX];
66 };
67 
68 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
69 struct icmpmsg_mib {
70  atomic_long_t mibs[ICMPMSG_MIB_MAX];
71 };
72 
73 /* ICMP6 (IPv6-ICMP) */
74 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX
75 /* per network ns counters */
76 struct icmpv6_mib {
77  unsigned long mibs[ICMP6_MIB_MAX];
78 };
79 /* per device counters, (shared on all cpus) */
80 struct 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 */
86 struct icmpv6msg_mib {
87  atomic_long_t mibs[ICMP6MSG_MIB_MAX];
88 };
89 /* per device counters, (shared on all cpus) */
90 struct icmpv6msg_mib_device {
91  atomic_long_t mibs[ICMP6MSG_MIB_MAX];
92 };
93 
94 
95 /* TCP */
96 #define TCP_MIB_MAX __TCP_MIB_MAX
97 struct tcp_mib {
98  unsigned long mibs[TCP_MIB_MAX];
99 };
100 
101 /* UDP */
102 #define UDP_MIB_MAX __UDP_MIB_MAX
103 struct udp_mib {
104  unsigned long mibs[UDP_MIB_MAX];
105 };
106 
107 /* Linux */
108 #define LINUX_MIB_MAX __LINUX_MIB_MAX
109 struct linux_mib {
110  unsigned long mibs[LINUX_MIB_MAX];
111 };
112 
113 /* Linux Xfrm */
114 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
115 struct linux_xfrm_mib {
116  unsigned long mibs[LINUX_MIB_XFRMMAX];
117 };
118 
119 #define SNMP_ARRAY_SZ 1
120 
121 #define DEFINE_SNMP_STAT(type, name) \
122  __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
123 #define DEFINE_SNMP_STAT_ATOMIC(type, name) \
124  __typeof__(type) *name
125 #define DECLARE_SNMP_STAT(type, name) \
126  extern __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
127 
128 #define SNMP_INC_STATS_BH(mib, field) \
129  __this_cpu_inc(mib[0]->mibs[field])
130 
131 #define SNMP_INC_STATS_USER(mib, field) \
132  this_cpu_inc(mib[0]->mibs[field])
133 
134 #define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
135  atomic_long_inc(&mib->mibs[field])
136 
137 #define SNMP_INC_STATS(mib, field) \
138  this_cpu_inc(mib[0]->mibs[field])
139 
140 #define SNMP_DEC_STATS(mib, field) \
141  this_cpu_dec(mib[0]->mibs[field])
142 
143 #define SNMP_ADD_STATS_BH(mib, field, addend) \
144  __this_cpu_add(mib[0]->mibs[field], addend)
145 
146 #define SNMP_ADD_STATS_USER(mib, field, addend) \
147  this_cpu_add(mib[0]->mibs[field], addend)
148 
149 #define SNMP_ADD_STATS(mib, field, addend) \
150  this_cpu_add(mib[0]->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]->mibs) *ptr = mib[0]->mibs; \
158  this_cpu_inc(ptr[basefield##PKTS]); \
159  this_cpu_add(ptr[basefield##OCTETS], addend); \
160  } while (0)
161 #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
162  do { \
163  __typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs; \
164  __this_cpu_inc(ptr[basefield##PKTS]); \
165  __this_cpu_add(ptr[basefield##OCTETS], addend); \
166  } while (0)
167 
168 
169 #if BITS_PER_LONG==32
170 
171 #define SNMP_ADD_STATS64_BH(mib, field, addend) \
172  do { \
173  __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \
174  u64_stats_update_begin(&ptr->syncp); \
175  ptr->mibs[field] += addend; \
176  u64_stats_update_end(&ptr->syncp); \
177  } while (0)
178 
179 #define SNMP_ADD_STATS64_USER(mib, field, addend) \
180  do { \
181  local_bh_disable(); \
182  SNMP_ADD_STATS64_BH(mib, field, addend); \
183  local_bh_enable(); \
184  } while (0)
185 
186 #define SNMP_ADD_STATS64(mib, field, addend) \
187  SNMP_ADD_STATS64_USER(mib, field, addend)
188 
189 #define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
190 #define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
191 #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
192 #define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
193  do { \
194  __typeof__(*mib[0]) *ptr; \
195  ptr = __this_cpu_ptr((mib)[0]); \
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  } while (0)
201 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
202  do { \
203  local_bh_disable(); \
204  SNMP_UPD_PO_STATS64_BH(mib, basefield, addend); \
205  local_bh_enable(); \
206  } while (0)
207 #else
208 #define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
209 #define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
210 #define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
211 #define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
212 #define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
213 #define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
214 #define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
215 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
216 #define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)
217 #endif
218 
219 #endif
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