Exemplo n.º 1
0
void DecodeIPV6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
    int ret;

    SCPerfCounterIncr(dtv->counter_ipv6, tv->sc_perf_pca);

    /* do the actual decoding */
    ret = DecodeIPV6Packet (tv, dtv, p, pkt, len);
    if (ret < 0) {
        p->ip6h = NULL;
        return;
    }

#ifdef DEBUG
    if (SCLogDebugEnabled()) { /* only convert the addresses if debug is really enabled */
        /* debug print */
        char s[46], d[46];
        PrintInet(AF_INET6, (const void *)GET_IPV6_SRC_ADDR(p), s, sizeof(s));
        PrintInet(AF_INET6, (const void *)GET_IPV6_DST_ADDR(p), d, sizeof(d));
        SCLogDebug("IPV6 %s->%s - CLASS: %" PRIu32 " FLOW: %" PRIu32 " NH: %" PRIu32 " PLEN: %" PRIu32 " HLIM: %" PRIu32 "", s,d,
                IPV6_GET_CLASS(p), IPV6_GET_FLOW(p), IPV6_GET_NH(p), IPV6_GET_PLEN(p),
                IPV6_GET_HLIM(p));
    }
#endif /* DEBUG */

    /* now process the Ext headers and/or the L4 Layer */
    switch(IPV6_GET_NH(p)) {
        case IPPROTO_TCP:
            IPV6_SET_L4PROTO (p, IPPROTO_TCP);
            DecodeTCP(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            return;
        case IPPROTO_UDP:
            IPV6_SET_L4PROTO (p, IPPROTO_UDP);
            DecodeUDP(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            return;
            break;
        case IPPROTO_ICMPV6:
            IPV6_SET_L4PROTO (p, IPPROTO_ICMPV6);
            DecodeICMPV6(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            return;
        case IPPROTO_SCTP:
            IPV6_SET_L4PROTO (p, IPPROTO_SCTP);
            DecodeSCTP(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            return;
        case IPPROTO_IPIP:
            IPV6_SET_L4PROTO(p, IPPROTO_IPIP);
            DecodeIPv4inIPv6(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            return;
        case IPPROTO_IPV6:
            DecodeIP6inIP6(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            return;
        case IPPROTO_FRAGMENT:
        case IPPROTO_HOPOPTS:
        case IPPROTO_ROUTING:
        case IPPROTO_NONE:
        case IPPROTO_DSTOPTS:
        case IPPROTO_AH:
        case IPPROTO_ESP:
            DecodeIPV6ExtHdrs(tv, dtv, p, pkt + IPV6_HEADER_LEN, IPV6_GET_PLEN(p), pq);
            break;
        case IPPROTO_ICMP:
            ENGINE_SET_EVENT(p,IPV6_WITH_ICMPV4);
            break;
        default:
            IPV6_SET_L4PROTO (p, IPV6_GET_NH(p));
            break;
    }
    p->proto = IPV6_GET_L4PROTO (p);

    /* Pass to defragger if a fragment. */
    if (IPV6_EXTHDR_ISSET_FH(p)) {
        Packet *rp = Defrag(tv, dtv, p);
        if (rp != NULL) {
            DecodeIPV6(tv, dtv, rp, (uint8_t *)rp->ip6h, IPV6_GET_PLEN(rp) + IPV6_HEADER_LEN, pq);
            PacketEnqueue(pq, rp);

            /* Not really a tunnel packet, but we're piggybacking that
             * functionality for now. */
            SET_TUNNEL_PKT(p);
        }
    }

#ifdef DEBUG
    if (IPV6_EXTHDR_ISSET_FH(p)) {
        SCLogDebug("IPV6 FRAG - HDRLEN: %" PRIuMAX " NH: %" PRIu32 " OFFSET: %" PRIu32 " ID: %" PRIu32 "",
            (uintmax_t)IPV6_EXTHDR_GET_FH_HDRLEN(p), IPV6_EXTHDR_GET_FH_NH(p),
            IPV6_EXTHDR_GET_FH_OFFSET(p), IPV6_EXTHDR_GET_FH_ID(p));
    }
    if (IPV6_EXTHDR_ISSET_RH(p)) {
        SCLogDebug("IPV6 ROUTE - HDRLEN: %" PRIu32 " NH: %" PRIu32 " TYPE: %" PRIu32 "",
            IPV6_EXTHDR_GET_RH_HDRLEN(p), IPV6_EXTHDR_GET_RH_NH(p),
            IPV6_EXTHDR_GET_RH_TYPE(p));
    }
    if (IPV6_EXTHDR_ISSET_HH(p)) {
        SCLogDebug("IPV6 HOPOPT - HDRLEN: %" PRIu32 " NH: %" PRIu32 "",
            IPV6_EXTHDR_GET_HH_HDRLEN(p), IPV6_EXTHDR_GET_HH_NH(p));
    }
    if (IPV6_EXTHDR_ISSET_DH1(p)) {
        SCLogDebug("IPV6 DSTOPT1 - HDRLEN: %" PRIu32 " NH: %" PRIu32 "",
            IPV6_EXTHDR_GET_DH1_HDRLEN(p), IPV6_EXTHDR_GET_DH1_NH(p));
    }
    if (IPV6_EXTHDR_ISSET_DH2(p)) {
        SCLogDebug("IPV6 DSTOPT2 - HDRLEN: %" PRIu32 " NH: %" PRIu32 "",
            IPV6_EXTHDR_GET_DH2_HDRLEN(p), IPV6_EXTHDR_GET_DH2_NH(p));
    }
#endif
    return;
}
Exemplo n.º 2
0
/**
 * \brief   Log the dropped packets in netfilter format when engine is running
 *          in inline mode
 *
 * \param tv    Pointer the current thread variables
 * \param p     Pointer the packet which is being logged
 * \param data  Pointer to the droplog struct
 *
 * \return return TM_EODE_OK on success
 */
static int LogDropLogNetFilter (ThreadVars *tv, const Packet *p, void *data)
{
    LogDropLogThread *dlt = (LogDropLogThread *)data;
    uint16_t proto = 0;
    char timebuf[64];

    CreateTimeString(&p->ts, timebuf, sizeof(timebuf));

    SCMutexLock(&dlt->file_ctx->fp_mutex);

    if (dlt->file_ctx->rotation_flag) {
        dlt->file_ctx->rotation_flag  = 0;
        if (SCConfLogReopen(dlt->file_ctx) != 0) {
            /* Rotation failed, error already logged. */
            SCMutexUnlock(&dlt->file_ctx->fp_mutex);
            return TM_ECODE_FAILED;
        }
    }

    char srcip[46] = "";
    char dstip[46] = "";

    if (PKT_IS_IPV4(p)) {
        PrintInet(AF_INET, (const void *)GET_IPV4_SRC_ADDR_PTR(p), srcip, 16);
        PrintInet(AF_INET, (const void *)GET_IPV4_DST_ADDR_PTR(p), dstip, 16);
        fprintf(dlt->file_ctx->fp, "%s: IN= OUT= SRC=%s DST=%s LEN=%"PRIu16" "
                "TOS=0x%02"PRIu8" TTL=%"PRIu8" ID=%"PRIu16"", timebuf,
                srcip, dstip, IPV4_GET_IPLEN(p), IPV4_GET_IPTOS(p),
                IPV4_GET_IPTTL(p), IPV4_GET_IPID(p));
        proto = IPV4_GET_IPPROTO(p);
    } else if (PKT_IS_IPV6(p)) {
        PrintInet(AF_INET6, (const void *)GET_IPV6_SRC_ADDR(p), srcip, sizeof(srcip));
        PrintInet(AF_INET6, (const void *)GET_IPV6_DST_ADDR(p), dstip, sizeof(dstip));
        fprintf(dlt->file_ctx->fp, "%s: IN= OUT= SRC=%s DST=%s LEN=%"PRIu16""
                " TC=%"PRIu32" HOPLIMIT=%"PRIu8" FLOWLBL=%"PRIu32"", timebuf,
                srcip, dstip, IPV6_GET_PLEN(p), IPV6_GET_CLASS(p),
                IPV6_GET_HLIM(p), IPV6_GET_FLOW(p));
        proto = IPV6_GET_L4PROTO(p);
    }

    if (SCProtoNameValid(proto) == TRUE) {
        fprintf(dlt->file_ctx->fp, " PROTO=%s",known_proto[proto]);
    } else {
        fprintf(dlt->file_ctx->fp, " PROTO=%03"PRIu16"",proto);
    }

    switch (proto) {
        case IPPROTO_TCP:
            fprintf(dlt->file_ctx->fp, " SPT=%"PRIu16" DPT=%"PRIu16" "
                    "SEQ=%"PRIu32" ACK=%"PRIu32" WINDOW=%"PRIu32"",
                    GET_TCP_SRC_PORT(p), GET_TCP_DST_PORT(p), TCP_GET_SEQ(p),
                    TCP_GET_ACK(p), TCP_GET_WINDOW(p));
            fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_SYN(p) ? " SYN" : "");
            fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_ACK(p) ? " ACK" : "");
            fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_PUSH(p) ? " PSH" : "");
            fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_RST(p) ? " RST" : "");
            fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_URG(p) ? " URG" : "");
            fprintf(dlt->file_ctx->fp, TCP_ISSET_FLAG_FIN(p) ? " FIN" : "");
            fprintf(dlt->file_ctx->fp, " RES=0x%02"PRIu8" URGP=%"PRIu16"",
                    TCP_GET_RAW_X2(p->tcph), TCP_GET_URG_POINTER(p));
            break;
        case IPPROTO_UDP:
            fprintf(dlt->file_ctx->fp, " SPT=%"PRIu16" DPT=%"PRIu16""
                    " LEN=%"PRIu16"", UDP_GET_SRC_PORT(p),
                    UDP_GET_DST_PORT(p), UDP_GET_LEN(p));
            break;
        case IPPROTO_ICMP:
            if (PKT_IS_ICMPV4(p)) {
                fprintf(dlt->file_ctx->fp, " TYPE=%"PRIu16" CODE=%"PRIu16""
                        " ID=%"PRIu16" SEQ=%"PRIu16"", ICMPV4_GET_TYPE(p),
                        ICMPV4_GET_CODE(p), ICMPV4_GET_ID(p), ICMPV4_GET_SEQ(p));
            } else if(PKT_IS_ICMPV6(p)) {
                fprintf(dlt->file_ctx->fp, " TYPE=%"PRIu16" CODE=%"PRIu16""
                        " ID=%"PRIu16" SEQ=%"PRIu16"", ICMPV6_GET_TYPE(p),
                        ICMPV6_GET_CODE(p), ICMPV6_GET_ID(p), ICMPV6_GET_SEQ(p));
            }
            break;
        default:
            fprintf(dlt->file_ctx->fp," Unknown protocol");
    }

    fprintf(dlt->file_ctx->fp,"\n");

    fflush(dlt->file_ctx->fp);

    dlt->drop_cnt++;
    SCMutexUnlock(&dlt->file_ctx->fp_mutex);

    return TM_ECODE_OK;

}
Exemplo n.º 3
0
/**
 * \brief   Log the dropped packets in netfilter format when engine is running
 *          in inline mode
 *
 * \param tv    Pointer the current thread variables
 * \param p     Pointer the packet which is being logged
 *
 * \return return TM_EODE_OK on success
 */
static int DropLogJSON (JsonDropLogThread *aft, const Packet *p)
{
    uint16_t proto = 0;
    MemBuffer *buffer = (MemBuffer *)aft->buffer;
    json_t *js = CreateJSONHeader((Packet *)p, 0, "drop");//TODO const
    if (unlikely(js == NULL))
        return TM_ECODE_OK;

    json_t *djs = json_object();
    if (unlikely(djs == NULL)) {
        json_decref(js);
        return TM_ECODE_OK;
    }

    /* reset */
    MemBufferReset(buffer);

    if (PKT_IS_IPV4(p)) {
        json_object_set_new(djs, "len", json_integer(IPV4_GET_IPLEN(p)));
        json_object_set_new(djs, "tos", json_integer(IPV4_GET_IPTOS(p)));
        json_object_set_new(djs, "ttl", json_integer(IPV4_GET_IPTTL(p)));
        json_object_set_new(djs, "ipid", json_integer(IPV4_GET_IPID(p)));
        proto = IPV4_GET_IPPROTO(p);
    } else if (PKT_IS_IPV6(p)) {
        json_object_set_new(djs, "len", json_integer(IPV6_GET_PLEN(p)));
        json_object_set_new(djs, "tc", json_integer(IPV6_GET_CLASS(p)));
        json_object_set_new(djs, "hoplimit", json_integer(IPV6_GET_HLIM(p)));
        json_object_set_new(djs, "flowlbl", json_integer(IPV6_GET_FLOW(p)));
        proto = IPV6_GET_L4PROTO(p);
    }
    switch (proto) {
        case IPPROTO_TCP:
            json_object_set_new(djs, "tcpseq", json_integer(TCP_GET_SEQ(p)));
            json_object_set_new(djs, "tcpack", json_integer(TCP_GET_ACK(p)));
            json_object_set_new(djs, "tcpwin", json_integer(TCP_GET_WINDOW(p)));
            json_object_set_new(djs, "syn", TCP_ISSET_FLAG_SYN(p) ? json_true() : json_false());
            json_object_set_new(djs, "ack", TCP_ISSET_FLAG_ACK(p) ? json_true() : json_false());
            json_object_set_new(djs, "psh", TCP_ISSET_FLAG_PUSH(p) ? json_true() : json_false());
            json_object_set_new(djs, "rst", TCP_ISSET_FLAG_RST(p) ? json_true() : json_false());
            json_object_set_new(djs, "urg", TCP_ISSET_FLAG_URG(p) ? json_true() : json_false());
            json_object_set_new(djs, "fin", TCP_ISSET_FLAG_FIN(p) ? json_true() : json_false());
            json_object_set_new(djs, "tcpres", json_integer(TCP_GET_RAW_X2(p->tcph)));
            json_object_set_new(djs, "tcpurgp", json_integer(TCP_GET_URG_POINTER(p)));
            break;
        case IPPROTO_UDP:
            json_object_set_new(djs, "udplen", json_integer(UDP_GET_LEN(p)));
            break;
        case IPPROTO_ICMP:
            if (PKT_IS_ICMPV4(p)) {
                json_object_set_new(djs, "icmp_id", json_integer(ICMPV4_GET_ID(p)));
                json_object_set_new(djs, "icmp_seq", json_integer(ICMPV4_GET_SEQ(p)));
            } else if(PKT_IS_ICMPV6(p)) {
                json_object_set_new(djs, "icmp_id", json_integer(ICMPV6_GET_ID(p)));
                json_object_set_new(djs, "icmp_seq", json_integer(ICMPV6_GET_SEQ(p)));
            }
            break;
    }
    json_object_set_new(js, "drop", djs);
    OutputJSONBuffer(js, aft->file_ctx, buffer);
    json_object_del(js, "drop");
    json_object_clear(js);
    json_decref(js);

    return TM_ECODE_OK;
}