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