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 all unsigned longs. Linux will soon be so reliable that even 51 * these will rapidly get too small 8-). Seriously consider the IpInReceives 52 * count on the 20Gb/s + networks people expect in a few years time! 53 */ 54 55 /* IPstats */ 56 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX 57 struct ipstats_mib { 58 unsigned long mibs[IPSTATS_MIB_MAX]; 59 }; 60 61 /* ICMP */ 62 #define ICMP_MIB_DUMMY __ICMP_MIB_MAX 63 #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1) 64 65 struct icmp_mib { 66 unsigned long mibs[ICMP_MIB_MAX]; 67 }; 68 69 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 70 struct icmpmsg_mib { 71 unsigned long mibs[ICMPMSG_MIB_MAX]; 72 }; 73 74 /* ICMP6 (IPv6-ICMP) */ 75 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX 76 struct icmpv6_mib { 77 unsigned long mibs[ICMP6_MIB_MAX]; 78 }; 79 80 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 81 struct icmpv6msg_mib { 82 unsigned long mibs[ICMP6MSG_MIB_MAX]; 83 }; 84 85 86 /* TCP */ 87 #define TCP_MIB_MAX __TCP_MIB_MAX 88 struct tcp_mib { 89 unsigned long mibs[TCP_MIB_MAX]; 90 }; 91 92 /* UDP */ 93 #define UDP_MIB_MAX __UDP_MIB_MAX 94 struct udp_mib { 95 unsigned long mibs[UDP_MIB_MAX]; 96 }; 97 98 /* Linux */ 99 #define LINUX_MIB_MAX __LINUX_MIB_MAX 100 struct linux_mib { 101 unsigned long mibs[LINUX_MIB_MAX]; 102 }; 103 104 /* Linux Xfrm */ 105 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX 106 struct linux_xfrm_mib { 107 unsigned long mibs[LINUX_MIB_XFRMMAX]; 108 }; 109 110 /* 111 * FIXME: On x86 and some other CPUs the split into user and softirq parts 112 * is not needed because addl $1,memory is atomic against interrupts (but 113 * atomic_inc would be overkill because of the lock cycles). Wants new 114 * nonlocked_atomic_inc() primitives -AK 115 */ 116 #define DEFINE_SNMP_STAT(type, name) \ 117 __typeof__(type) __percpu *name[2] 118 #define DECLARE_SNMP_STAT(type, name) \ 119 extern __typeof__(type) __percpu *name[2] 120 121 #define SNMP_STAT_BHPTR(name) (name[0]) 122 #define SNMP_STAT_USRPTR(name) (name[1]) 123 124 #define SNMP_INC_STATS_BH(mib, field) \ 125 __this_cpu_inc(mib[0]->mibs[field]) 126 #define SNMP_INC_STATS_USER(mib, field) \ 127 this_cpu_inc(mib[1]->mibs[field]) 128 #define SNMP_INC_STATS(mib, field) \ 129 this_cpu_inc(mib[!in_softirq()]->mibs[field]) 130 #define SNMP_DEC_STATS(mib, field) \ 131 this_cpu_dec(mib[!in_softirq()]->mibs[field]) 132 #define SNMP_ADD_STATS_BH(mib, field, addend) \ 133 __this_cpu_add(mib[0]->mibs[field], addend) 134 #define SNMP_ADD_STATS_USER(mib, field, addend) \ 135 this_cpu_add(mib[1]->mibs[field], addend) 136 #define SNMP_ADD_STATS(mib, field, addend) \ 137 this_cpu_add(mib[0]->mibs[field], addend) 138 /* 139 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr" 140 * to make @ptr a non-percpu pointer. 141 */ 142 #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ 143 do { \ 144 __typeof__(*mib[0]) *ptr; \ 145 preempt_disable(); \ 146 ptr = this_cpu_ptr((mib)[!in_softirq()]); \ 147 ptr->mibs[basefield##PKTS]++; \ 148 ptr->mibs[basefield##OCTETS] += addend;\ 149 preempt_enable(); \ 150 } while (0) 151 #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \ 152 do { \ 153 __typeof__(*mib[0]) *ptr = \ 154 __this_cpu_ptr((mib)[!in_softirq()]); \ 155 ptr->mibs[basefield##PKTS]++; \ 156 ptr->mibs[basefield##OCTETS] += addend;\ 157 } while (0) 158 #endif 159