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_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]; 68 }; 69 70 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 71 struct icmpmsg_mib { 72 unsigned long mibs[ICMPMSG_MIB_MAX]; 73 }; 74 75 /* ICMP6 (IPv6-ICMP) */ 76 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX 77 struct icmpv6_mib { 78 unsigned long mibs[ICMP6_MIB_MAX]; 79 }; 80 81 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 82 struct icmpv6msg_mib { 83 unsigned long mibs[ICMP6MSG_MIB_MAX]; 84 }; 85 86 87 /* TCP */ 88 #define TCP_MIB_MAX __TCP_MIB_MAX 89 struct tcp_mib { 90 unsigned long mibs[TCP_MIB_MAX]; 91 }; 92 93 /* UDP */ 94 #define UDP_MIB_MAX __UDP_MIB_MAX 95 struct udp_mib { 96 unsigned long mibs[UDP_MIB_MAX]; 97 }; 98 99 /* Linux */ 100 #define LINUX_MIB_MAX __LINUX_MIB_MAX 101 struct linux_mib { 102 unsigned long mibs[LINUX_MIB_MAX]; 103 }; 104 105 /* Linux Xfrm */ 106 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX 107 struct linux_xfrm_mib { 108 unsigned long mibs[LINUX_MIB_XFRMMAX]; 109 }; 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) \ 118 __typeof__(type) __percpu *name[2] 119 #define DECLARE_SNMP_STAT(type, name) \ 120 extern __typeof__(type) __percpu *name[2] 121 122 #define SNMP_STAT_BHPTR(name) (name[0]) 123 #define SNMP_STAT_USRPTR(name) (name[1]) 124 125 #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) 137 #define SNMP_ADD_STATS(mib, field, addend) \ 138 this_cpu_add(mib[!in_softirq()]->mibs[field], addend) 139 /* 140 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr" 141 * to make @ptr a non-percpu pointer. 142 */ 143 #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ 144 do { \ 145 __typeof__(*mib[0]) *ptr; \ 146 preempt_disable(); \ 147 ptr = this_cpu_ptr((mib)[!in_softirq()]); \ 148 ptr->mibs[basefield##PKTS]++; \ 149 ptr->mibs[basefield##OCTETS] += addend;\ 150 preempt_enable(); \ 151 } while (0) 152 #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \ 153 do { \ 154 __typeof__(*mib[0]) *ptr = \ 155 __this_cpu_ptr((mib)[!in_softirq()]); \ 156 ptr->mibs[basefield##PKTS]++; \ 157 ptr->mibs[basefield##OCTETS] += addend;\ 158 } while (0) 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 224 225 #endif 226