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_var.h> 40 #include <net/if_mib.h> 41 #include <net/vnet.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 static SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0, 68 "Variables global to all interfaces"); 69 70 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, 71 CTLFLAG_VNET | CTLFLAG_RD, &VNET_NAME(if_index), 0, 72 "Number of configured interfaces"); 73 74 static int 75 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */ 76 { 77 int *name = (int *)arg1; 78 int error; 79 u_int namelen = arg2; 80 struct ifnet *ifp; 81 struct ifmibdata ifmd; 82 size_t dlen; 83 char *dbuf; 84 85 if (namelen != 2) 86 return EINVAL; 87 if (name[0] <= 0) 88 return (ENOENT); 89 ifp = ifnet_byindex_ref(name[0]); 90 if (ifp == NULL) 91 return (ENOENT); 92 93 switch(name[1]) { 94 default: 95 error = ENOENT; 96 goto out; 97 98 case IFDATA_GENERAL: 99 bzero(&ifmd, sizeof(ifmd)); 100 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name)); 101 102 ifmd.ifmd_pcount = ifp->if_pcount; 103 if_data_copy(ifp, &ifmd.ifmd_data); 104 105 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 = 109 ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 110 111 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd); 112 if (error) 113 goto out; 114 break; 115 116 case IFDATA_LINKSPECIFIC: 117 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen); 118 if (error || !req->newptr) 119 goto out; 120 121 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen); 122 if (error) 123 goto out; 124 break; 125 126 case IFDATA_DRIVERNAME: 127 /* 20 is enough for 64bit ints */ 128 dlen = strlen(ifp->if_dname) + 20 + 1; 129 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) { 130 error = ENOMEM; 131 goto out; 132 } 133 if (ifp->if_dunit == IF_DUNIT_NONE) 134 strcpy(dbuf, ifp->if_dname); 135 else 136 sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit); 137 138 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1); 139 if (error == 0 && req->newptr != NULL) 140 error = EPERM; 141 free(dbuf, M_TEMP); 142 goto out; 143 } 144 out: 145 if_rele(ifp); 146 return error; 147 } 148 149 static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW, 150 sysctl_ifdata, "Interface table"); 151 152