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