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