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 */ 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 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 */ 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 unsigned long 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 /* 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 238