1 /* 2 * Copyright 1996 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $ 30 * $DragonFly: src/sys/net/if_mib.c,v 1.7 2005/06/15 19:29:30 joerg Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/socket.h> 37 #include <sys/sysctl.h> 38 39 #include <net/if.h> 40 #include <net/if_var.h> 41 #include <net/if_mib.h> 42 43 /* 44 * A sysctl(3) MIB for generic interface information. This information 45 * is exported in the net.link.generic branch, which has the following 46 * structure: 47 * 48 * net.link.generic .system - system-wide control variables 49 * and statistics (node) 50 * .ifdata.<ifindex>.general 51 * - what's in `struct ifdata' 52 * plus some other info 53 * .ifdata.<ifindex>.linkspecific 54 * - a link-type-specific data 55 * structure (as might be used 56 * by an SNMP agent 57 * 58 * Perhaps someday we will make addresses accessible via this interface 59 * as well (then there will be four such...). The reason that the 60 * index comes before the last element in the name is because it 61 * seems more orthogonal that way, particularly with the possibility 62 * of other per-interface data living down here as well (e.g., integrated 63 * services stuff). 64 */ 65 66 SYSCTL_DECL(_net_link_generic); 67 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0, 68 "Variables global to all interfaces"); 69 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD, 70 &if_index, 0, "Number of configured interfaces"); 71 72 static int 73 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */ 74 { 75 int *name = (int *)arg1; 76 int error; 77 u_int namelen = arg2; 78 struct ifnet *ifp; 79 struct ifmibdata ifmd; 80 81 if (namelen != 2) 82 return EINVAL; 83 84 /* 85 * Hold the ifnet lock while we are accessing the ifp 86 * obtained through ifindex2ifnet. 87 */ 88 ifnet_lock(); 89 90 if (name[0] <= 0 || name[0] > if_index || 91 ifindex2ifnet[name[0]] == NULL) { 92 ifnet_unlock(); 93 return ENOENT; 94 } 95 96 ifp = ifindex2ifnet[name[0]]; 97 98 switch(name[1]) { 99 default: 100 ifnet_unlock(); 101 return ENOENT; 102 103 case IFDATA_GENERAL: 104 bzero(&ifmd, sizeof(ifmd)); 105 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name)); 106 107 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld 108 COPY(pcount); 109 COPY(flags); 110 COPY(data); 111 #undef COPY 112 #define COPY_DATA(name) IFNET_STAT_GET(ifp, name, ifmd.ifmd_data.ifi_##name) 113 COPY_DATA(ipackets); 114 COPY_DATA(ierrors); 115 COPY_DATA(opackets); 116 COPY_DATA(oerrors); 117 COPY_DATA(collisions); 118 COPY_DATA(ibytes); 119 COPY_DATA(obytes); 120 COPY_DATA(imcasts); 121 COPY_DATA(omcasts); 122 COPY_DATA(iqdrops); 123 COPY_DATA(noproto); 124 COPY_DATA(oqdrops); 125 #undef COPY_DATA 126 127 ifmd.ifmd_snd_maxlen = ifp->if_snd.altq_maxlen; 128 #ifdef notyet 129 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len; 130 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops; 131 #endif 132 133 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd); 134 if (error || !req->newptr) { 135 ifnet_unlock(); 136 return error; 137 } 138 139 error = SYSCTL_IN(req, &ifmd, sizeof ifmd); 140 if (error) { 141 ifnet_unlock(); 142 return error; 143 } 144 145 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld 146 DONTCOPY(type); 147 DONTCOPY(physical); 148 DONTCOPY(addrlen); 149 DONTCOPY(hdrlen); 150 DONTCOPY(mtu); 151 DONTCOPY(metric); 152 DONTCOPY(baudrate); 153 #undef DONTCOPY 154 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld 155 COPY(data); 156 #undef COPY 157 #define COPY_DATA(name) IFNET_STAT_SET(ifp, name, ifmd.ifmd_data.ifi_##name) 158 COPY_DATA(ipackets); 159 COPY_DATA(ierrors); 160 COPY_DATA(opackets); 161 COPY_DATA(oerrors); 162 COPY_DATA(collisions); 163 COPY_DATA(ibytes); 164 COPY_DATA(obytes); 165 COPY_DATA(imcasts); 166 COPY_DATA(omcasts); 167 COPY_DATA(iqdrops); 168 COPY_DATA(noproto); 169 COPY_DATA(oqdrops); 170 #undef COPY_DATA 171 172 #ifdef notyet 173 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen; 174 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops; 175 #endif 176 break; 177 178 case IFDATA_LINKSPECIFIC: 179 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen); 180 if (error || !req->newptr) { 181 ifnet_unlock(); 182 return error; 183 } 184 185 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen); 186 if (error) { 187 ifnet_unlock(); 188 return error; 189 } 190 } 191 192 ifnet_unlock(); 193 return 0; 194 } 195 196 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW, 197 sysctl_ifdata, "Interface table"); 198 199