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 * $FreeBSD$ 30 */ 31 32 #include "opt_route.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/socket.h> 38 #include <sys/sysctl.h> 39 #include <sys/vimage.h> 40 41 #include <net/if.h> 42 #include <net/if_mib.h> 43 #include <net/route.h> 44 #include <net/vnet.h> 45 46 /* 47 * A sysctl(3) MIB for generic interface information. This information 48 * is exported in the net.link.generic branch, which has the following 49 * structure: 50 * 51 * net.link.generic .system - system-wide control variables 52 * and statistics (node) 53 * .ifdata.<ifindex>.general 54 * - what's in `struct ifdata' 55 * plus some other info 56 * .ifdata.<ifindex>.linkspecific 57 * - a link-type-specific data 58 * structure (as might be used 59 * by an SNMP agent 60 * 61 * Perhaps someday we will make addresses accessible via this interface 62 * as well (then there will be four such...). The reason that the 63 * index comes before the last element in the name is because it 64 * seems more orthogonal that way, particularly with the possibility 65 * of other per-interface data living down here as well (e.g., integrated 66 * services stuff). 67 */ 68 69 SYSCTL_DECL(_net_link_generic); 70 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0, 71 "Variables global to all interfaces"); 72 73 SYSCTL_V_INT(V_NET, vnet_net, _net_link_generic_system, IFMIB_IFCOUNT, 74 ifcount, CTLFLAG_RD, if_index, 0, 75 "Number of configured interfaces"); 76 77 static int 78 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */ 79 { 80 INIT_VNET_NET(curvnet); 81 int *name = (int *)arg1; 82 int error; 83 u_int namelen = arg2; 84 struct ifnet *ifp; 85 struct ifmibdata ifmd; 86 size_t dlen; 87 char *dbuf; 88 89 if (namelen != 2) 90 return EINVAL; 91 92 if (name[0] <= 0 || name[0] > V_if_index || 93 ifnet_byindex(name[0]) == NULL) 94 return ENOENT; 95 96 ifp = ifnet_byindex(name[0]); 97 98 switch(name[1]) { 99 default: 100 return ENOENT; 101 102 case IFDATA_GENERAL: 103 bzero(&ifmd, sizeof(ifmd)); 104 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name)); 105 106 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld 107 COPY(pcount); 108 COPY(data); 109 #undef COPY 110 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags; 111 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len; 112 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen; 113 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops; 114 115 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd); 116 if (error || !req->newptr) 117 return error; 118 119 error = SYSCTL_IN(req, &ifmd, sizeof ifmd); 120 if (error) 121 return error; 122 123 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld 124 DONTCOPY(type); 125 DONTCOPY(physical); 126 DONTCOPY(addrlen); 127 DONTCOPY(hdrlen); 128 DONTCOPY(mtu); 129 DONTCOPY(metric); 130 DONTCOPY(baudrate); 131 #undef DONTCOPY 132 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld 133 COPY(data); 134 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen; 135 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops; 136 #undef COPY 137 break; 138 139 case IFDATA_LINKSPECIFIC: 140 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen); 141 if (error || !req->newptr) 142 return error; 143 144 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen); 145 if (error) 146 return error; 147 break; 148 149 case IFDATA_DRIVERNAME: 150 /* 20 is enough for 64bit ints */ 151 dlen = strlen(ifp->if_dname) + 20 + 1; 152 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) 153 return (ENOMEM); 154 if (ifp->if_dunit == IF_DUNIT_NONE) 155 strcpy(dbuf, ifp->if_dname); 156 else 157 sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit); 158 159 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1); 160 if (error == 0 && req->newptr != NULL) 161 error = EPERM; 162 free(dbuf, M_TEMP); 163 return (error); 164 } 165 return 0; 166 } 167 168 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW, 169 sysctl_ifdata, "Interface table"); 170 171