interface_sysctl.c

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/*
 *  Interface MIB architecture support
 *
 *  Based on patch 1362403, submited by Rojer
 *
 * $Id: interface_sysctl.c 16552 2007-06-20 21:34:24Z tanders $
 */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include "mibII/mibII_common.h"
#include "if-mib/ifTable/ifTable_constants.h"

#include <net-snmp/agent/net-snmp-agent-includes.h>

#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#else
#error "BSD should have sys/ioctl header"
#endif

#include <net-snmp/data_access/interface.h>
#include <net-snmp/data_access/ipaddress.h>
#include "if-mib/data_access/interface.h"

#include <sys/types.h>
#include <sys/time.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_media.h>

/*
 * account for minor differences between FreeBSD and OpenBSD.
 * If this gets unruly, split stuff out into the respective
 * files (interface_*BDS.c).
 */
/*
 * FreeBSD has 2 promiscuous flags: kernel/user; check either
 * http://unix.derkeiler.com/Mailing-Lists/FreeBSD/net/2004-09/0289.html
 * which says:
 * The first flag (IFF_PROMISC) is the one that the kernel code uses and
 * sets on an interface's ifp structure. The second one is the one that
 * comes from user space programs and is sent to the routine ifhwioctl()
 * to set the first flag.
 */
#ifdef IFF_PPROMISC
#   define ARCH_PROMISC_FLAG (IFF_PPROMISC|IFF_PROMISC)
#else
#   define ARCH_PROMISC_FLAG IFF_PROMISC
#endif

extern struct timeval starttime;

/* sa_len roundup macro. */
#define ROUNDUP(a) \
  ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))

void
netsnmp_arch_interface_init(void)
{
    /*
     * nothing to do
     */
}

/*
 * find the ifIndex for an interface name
 *
 * @retval 0 : no index found
 * @retval >0: ifIndex for interface
 */
oid
netsnmp_arch_interface_index_find(const char *name)
{
    return if_nametoindex(name);
}

/*
 * subroutine to translate known media typed to speed.
 * see /usr/include/net/if_media.h for definitions
 */

void
netsnmp_sysctl_ifmedia_to_speed(int media, u_int *speed,
                                u_int *speed_high)
{
    *speed = 0;
    *speed_high = 0;

    switch (IFM_TYPE(media)) {
        case IFM_ETHER:
            switch (IFM_SUBTYPE(media)) {
                case IFM_10_T:
                case IFM_10_2:
                case IFM_10_5:
                case IFM_10_STP:
                case IFM_10_FL:
                    *speed = 10000000;
                    *speed_high = 10; break;
                case IFM_100_TX:
                case IFM_100_FX:
                case IFM_100_T4:
                case IFM_100_VG:
                case IFM_100_T2:
                    *speed = 100000000;
                    *speed_high = 100; break;
                case IFM_1000_LX:
                case IFM_1000_CX:
#ifdef IFM_1000_T
                case IFM_1000_T:
#endif
                    *speed = 1000000000;
                    *speed_high = 1000; break;
#ifdef IFM_10GBASE_SR
                case IFM_10GBASE_SR:
                case IFM_10GBASE_LR:
                    *speed = (u_int) -1; /* 4294967295; */
                    *speed_high = 10000; break;
#endif
            }
            break;
        case IFM_IEEE80211:
            switch (IFM_SUBTYPE(media)) {
                case IFM_IEEE80211_FH1:
                case IFM_IEEE80211_DS1:
                    *speed = 1000000;
                    *speed_high = 1;
                    break;
                case IFM_IEEE80211_FH2:
                case IFM_IEEE80211_DS2:
                    *speed = 2000000;
                    *speed_high = 2;
                    break;
                case IFM_IEEE80211_DS5:
                    *speed = 5500000;
                    *speed_high = 5;
                    break;
                case IFM_IEEE80211_DS11:
                    *speed = 11000000;
                    *speed_high = 11;
                    break;
                case IFM_IEEE80211_DS22:
                    *speed = 22000000;
                    *speed_high = 22;
                    break;
#ifdef IFM_IEEE80211_OFDM6
                case IFM_IEEE80211_OFDM6:
                    *speed = 6000000;
                    *speed_high = 6;
                    break;
                case IFM_IEEE80211_OFDM9:
                    *speed = 9000000;
                    *speed_high = 9;
                    break;
                case IFM_IEEE80211_OFDM12:
                    *speed = 12000000;
                    *speed_high = 12;
                    break;
                case IFM_IEEE80211_OFDM18:
                    *speed = 18000000;
                    *speed_high = 18;
                    break;
                case IFM_IEEE80211_OFDM24:
                    *speed = 24000000;
                    *speed_high = 24;
                    break;
                case IFM_IEEE80211_OFDM36:
                    *speed = 36000000;
                    *speed_high = 36;
                    break;
                case IFM_IEEE80211_OFDM48:
                    *speed = 48000000;
                    *speed_high = 48;
                    break;
                case IFM_IEEE80211_OFDM54:
                    *speed = 54000000;
                    *speed_high = 54;
                    break;
                case IFM_IEEE80211_OFDM72:
                    *speed = 72000000;
                    *speed_high = 72;
                    break;
#endif
            }
            break;
        case IFM_TOKEN:
            switch (IFM_SUBTYPE(media)) {
                case IFM_TOK_STP4:
                case IFM_TOK_UTP4:
                    *speed = 4000000;
                    *speed_high = 4;
                    break;
                case IFM_TOK_STP16:
                case IFM_TOK_UTP16:
                    *speed = 16000000;
                    *speed_high = 16;
                    break;
#if defined(IFM_TOK_STP100) /* guessing if you've got one, you've got the other.. */
                case IFM_TOK_STP100:
                case IFM_TOK_UTP100:
                    *speed = 100000000;
                    *speed_high = 100;
                    break;
#endif
            }
            break;
#ifdef IFM_ATM
        case IFM_ATM:
            switch (IFM_SUBTYPE(media)) {
                case IFM_ATM_MM_155:
                case IFM_ATM_SM_155:
                    *speed = 155000000;
                    *speed_high = 155;
                    break;
                case IFM_ATM_MM_622:
                case IFM_ATM_SM_622:
                    *speed = 622000000;
                    *speed_high = 622;
                    break;
            }
#endif
    }
    return;
}

/*
 * @retval  0 speed could not be determined (error, unknown media)
 * @retval >0 speed, equal to *speed.
 *            sets *speed=2^31 and returns *speed_high=speed/10^6 as required
 *            by ifSpeed/ifHighSpeed.
 */

int
netsnmp_sysctl_get_if_speed(char *name, u_int *speed,
                            u_int *speed_high)
{
    int s;
    struct ifmediareq ifmr;
    int *media_list, i;
    u_int t_speed, t_speed_high; 
    u_int m_speed, m_speed_high;

    *speed = 0;
    *speed_high = 0;

    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        return 0;
    }

    (void) memset(&ifmr, 0, sizeof(ifmr));
    (void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));

    DEBUGMSGTL(("access:interface:container:sysctl"," speed in\n"));
    if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0 ||
        ifmr.ifm_count == 0) {

        close(s);
        return 0;
    }

    /*
     * try to get speed from current media.
     * if unsuccessful (e.g., interface is down), get a list of capabilities,
     * try each and return maximum speed the interface is capable of.
     */

    netsnmp_sysctl_ifmedia_to_speed(ifmr.ifm_current, speed, speed_high);

    if (*speed == 0 &&
        (media_list = (int *) malloc(ifmr.ifm_count * sizeof(int))) != NULL ) {

        ifmr.ifm_ulist = media_list;

        if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) == 0) {
            m_speed = 0;
            m_speed_high = 0;
            for (i = 0; i < ifmr.ifm_count; i++) {

                netsnmp_sysctl_ifmedia_to_speed(media_list[i], &t_speed,
                                                &t_speed_high);
                if (t_speed_high > m_speed_high ||
                    (t_speed_high == m_speed_high && t_speed > t_speed)) {
                    m_speed_high = t_speed_high;