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 * $Id$ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/queue.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/errno.h> 37 #include <sys/socket.h> 38 #include <sys/sysctl.h> 39 40 #include <net/if.h> 41 #include <net/if_dl.h> 42 #include <net/if_mib.h> 43 #include <net/if_types.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 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0, 69 "Variables global to all interfaces"); 70 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD, 71 &if_index, 0, "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, ifnlen; 78 u_int namelen = arg2; 79 struct ifnet *ifp; 80 char workbuf[64]; 81 struct ifmibdata ifmd; 82 83 if (namelen != 2) 84 return EINVAL; 85 86 if (name[0] <= 0 || name[0] > if_index) 87 return ENOENT; 88 89 ifp = ifnet_addrs[name[0] - 1]->ifa_ifp; 90 91 switch(name[1]) { 92 default: 93 return ENOENT; 94 95 case IFDATA_GENERAL: 96 ifnlen = sprintf(workbuf, "%s%d", ifp->if_name, ifp->if_unit); 97 if(ifnlen + 1 > sizeof ifmd.ifmd_name) { 98 return ENAMETOOLONG; 99 } else { 100 strcpy(ifmd.ifmd_name, workbuf); 101 } 102 103 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld 104 COPY(pcount); 105 COPY(flags); 106 COPY(data); 107 #undef COPY 108 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len; 109 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen; 110 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops; 111 112 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd); 113 if (error || !req->newptr) 114 return error; 115 116 error = SYSCTL_IN(req, &ifmd, sizeof ifmd); 117 if (error) 118 return error; 119 120 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld 121 DONTCOPY(type); 122 DONTCOPY(physical); 123 DONTCOPY(addrlen); 124 DONTCOPY(hdrlen); 125 DONTCOPY(mtu); 126 DONTCOPY(metric); 127 DONTCOPY(baudrate); 128 #undef DONTCOPY 129 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld 130 COPY(data); 131 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen; 132 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops; 133 #undef COPY 134 break; 135 136 case IFDATA_LINKSPECIFIC: 137 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen); 138 if (error || !req->newptr) 139 return error; 140 141 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen); 142 if (error) 143 return error; 144 145 } 146 return 0; 147 } 148 149 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW, 150 sysctl_ifdata, "Interface table"); 151 152