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_private.h> 42 #include <net/if_mib.h> 43 #include <net/vnet.h> 44 45 /* 46 * A sysctl(3) MIB for generic interface information. This information 47 * is exported in the net.link.generic branch, which has the following 48 * structure: 49 * 50 * net.link.generic .system - system-wide control variables 51 * and statistics (node) 52 * .ifdata.<ifindex>.general 53 * - what's in `struct ifdata' 54 * plus some other info 55 * .ifdata.<ifindex>.linkspecific 56 * - a link-type-specific data 57 * structure (as might be used 58 * by an SNMP agent 59 * 60 * Perhaps someday we will make addresses accessible via this interface 61 * as well (then there will be four such...). The reason that the 62 * index comes before the last element in the name is because it 63 * seems more orthogonal that way, particularly with the possibility 64 * of other per-interface data living down here as well (e.g., integrated 65 * services stuff). 66 */ 67 68 static int 69 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */ 70 { 71 int *name = (int *)arg1; 72 int error; 73 u_int namelen = arg2; 74 struct ifnet *ifp; 75 struct ifmibdata ifmd; 76 struct epoch_tracker et; 77 size_t dlen; 78 char *dbuf; 79 80 if (namelen != 2) 81 return EINVAL; 82 if (name[0] <= 0) 83 return (ENOENT); 84 NET_EPOCH_ENTER(et); 85 ifp = ifnet_byindex_ref(name[0]); 86 NET_EPOCH_EXIT(et); 87 if (ifp == NULL) 88 return (ENOENT); 89 90 switch(name[1]) { 91 default: 92 error = ENOENT; 93 goto out; 94 95 case IFDATA_GENERAL: 96 bzero(&ifmd, sizeof(ifmd)); 97 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name)); 98 99 ifmd.ifmd_pcount = ifp->if_pcount; 100 if_data_copy(ifp, &ifmd.ifmd_data); 101 102 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags; 103 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len; 104 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen; 105 ifmd.ifmd_snd_drops = 106 ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 107 108 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd); 109 if (error) 110 goto out; 111 break; 112 113 case IFDATA_LINKSPECIFIC: 114 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen); 115 if (error || !req->newptr) 116 goto out; 117 break; 118 119 case IFDATA_DRIVERNAME: 120 /* 20 is enough for 64bit ints */ 121 dlen = strlen(ifp->if_dname) + 20 + 1; 122 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) { 123 error = ENOMEM; 124 goto out; 125 } 126 if (ifp->if_dunit == IF_DUNIT_NONE) 127 strcpy(dbuf, ifp->if_dname); 128 else 129 sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit); 130 131 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1); 132 if (error == 0 && req->newptr != NULL) 133 error = EPERM; 134 free(dbuf, M_TEMP); 135 goto out; 136 } 137 out: 138 if_rele(ifp); 139 return error; 140 } 141 142 SYSCTL_DECL(_net_link_generic); 143 static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, 144 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ifdata, 145 "Interface table"); 146