7801dc7cb3
PR: kern/101162 Submitted by: CoolDavid (Tseng Guo-Fu) <cooldavid cdpa.nsysu.edu.tw>
664 lines
16 KiB
C
664 lines
16 KiB
C
/*-
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* Copyright (c) 2004-2005 Gleb Smirnoff <glebius@FreeBSD.org>
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* Copyright (c) 2001-2003 Roman V. Palagin <romanp@unshadow.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $SourceForge: ng_netflow.c,v 1.30 2004/09/05 11:37:43 glebius Exp $
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*/
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static const char rcs_id[] =
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"@(#) $FreeBSD$";
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <sys/ctype.h>
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#include <net/if.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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#include <net/if_var.h>
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#include <net/if_vlan_var.h>
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#include <net/bpf.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/netflow/netflow.h>
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#include <netgraph/netflow/ng_netflow.h>
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/* Netgraph methods */
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static ng_constructor_t ng_netflow_constructor;
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static ng_rcvmsg_t ng_netflow_rcvmsg;
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static ng_close_t ng_netflow_close;
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static ng_shutdown_t ng_netflow_rmnode;
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static ng_newhook_t ng_netflow_newhook;
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static ng_rcvdata_t ng_netflow_rcvdata;
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static ng_disconnect_t ng_netflow_disconnect;
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/* Parse type for struct ng_netflow_info */
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static const struct ng_parse_struct_field ng_netflow_info_type_fields[]
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= NG_NETFLOW_INFO_TYPE;
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static const struct ng_parse_type ng_netflow_info_type = {
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&ng_parse_struct_type,
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&ng_netflow_info_type_fields
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};
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/* Parse type for struct ng_netflow_ifinfo */
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static const struct ng_parse_struct_field ng_netflow_ifinfo_type_fields[]
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= NG_NETFLOW_IFINFO_TYPE;
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static const struct ng_parse_type ng_netflow_ifinfo_type = {
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&ng_parse_struct_type,
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&ng_netflow_ifinfo_type_fields
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};
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/* Parse type for struct ng_netflow_setdlt */
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static const struct ng_parse_struct_field ng_netflow_setdlt_type_fields[]
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= NG_NETFLOW_SETDLT_TYPE;
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static const struct ng_parse_type ng_netflow_setdlt_type = {
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&ng_parse_struct_type,
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&ng_netflow_setdlt_type_fields
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};
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/* Parse type for ng_netflow_setifindex */
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static const struct ng_parse_struct_field ng_netflow_setifindex_type_fields[]
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= NG_NETFLOW_SETIFINDEX_TYPE;
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static const struct ng_parse_type ng_netflow_setifindex_type = {
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&ng_parse_struct_type,
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&ng_netflow_setifindex_type_fields
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};
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/* Parse type for ng_netflow_settimeouts */
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static const struct ng_parse_struct_field ng_netflow_settimeouts_type_fields[]
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= NG_NETFLOW_SETTIMEOUTS_TYPE;
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static const struct ng_parse_type ng_netflow_settimeouts_type = {
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&ng_parse_struct_type,
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&ng_netflow_settimeouts_type_fields
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};
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_netflow_cmds[] = {
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{
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NGM_NETFLOW_COOKIE,
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NGM_NETFLOW_INFO,
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"info",
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NULL,
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&ng_netflow_info_type
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},
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{
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NGM_NETFLOW_COOKIE,
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NGM_NETFLOW_IFINFO,
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"ifinfo",
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&ng_parse_uint16_type,
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&ng_netflow_ifinfo_type
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},
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{
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NGM_NETFLOW_COOKIE,
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NGM_NETFLOW_SETDLT,
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"setdlt",
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&ng_netflow_setdlt_type,
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NULL
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},
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{
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NGM_NETFLOW_COOKIE,
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NGM_NETFLOW_SETIFINDEX,
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"setifindex",
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&ng_netflow_setifindex_type,
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NULL
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},
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{
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NGM_NETFLOW_COOKIE,
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NGM_NETFLOW_SETTIMEOUTS,
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"settimeouts",
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&ng_netflow_settimeouts_type,
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NULL
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},
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{ 0 }
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};
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/* Netgraph node type descriptor */
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static struct ng_type ng_netflow_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_NETFLOW_NODE_TYPE,
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.constructor = ng_netflow_constructor,
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.rcvmsg = ng_netflow_rcvmsg,
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.close = ng_netflow_close,
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.shutdown = ng_netflow_rmnode,
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.newhook = ng_netflow_newhook,
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.rcvdata = ng_netflow_rcvdata,
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.disconnect = ng_netflow_disconnect,
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.cmdlist = ng_netflow_cmds,
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};
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NETGRAPH_INIT(netflow, &ng_netflow_typestruct);
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/* Called at node creation */
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static int
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ng_netflow_constructor(node_p node)
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{
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priv_p priv;
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int error = 0;
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/* Initialize private data */
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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
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if (priv == NULL)
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return (ENOMEM);
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bzero(priv, sizeof(*priv));
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/* Make node and its data point at each other */
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NG_NODE_SET_PRIVATE(node, priv);
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priv->node = node;
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/* Initialize timeouts to default values */
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priv->info.nfinfo_inact_t = INACTIVE_TIMEOUT;
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priv->info.nfinfo_act_t = ACTIVE_TIMEOUT;
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/* Initialize callout handle */
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callout_init(&priv->exp_callout, 1);
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/* Allocate memory and set up flow cache */
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if ((error = ng_netflow_cache_init(priv)))
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return (error);
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return (0);
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}
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/*
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* ng_netflow supports two hooks: data and export.
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* Incoming traffic is expected on data, and expired
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* netflow datagrams are sent to export.
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*/
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static int
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ng_netflow_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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if (strncmp(name, NG_NETFLOW_HOOK_DATA, /* an iface hook? */
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strlen(NG_NETFLOW_HOOK_DATA)) == 0) {
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iface_p iface;
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int ifnum = -1;
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const char *cp;
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char *eptr;
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cp = name + strlen(NG_NETFLOW_HOOK_DATA);
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if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
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return (EINVAL);
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ifnum = (int)strtoul(cp, &eptr, 10);
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if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES)
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return (EINVAL);
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/* See if hook is already connected */
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if (priv->ifaces[ifnum].hook != NULL)
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return (EISCONN);
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iface = &priv->ifaces[ifnum];
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/* Link private info and hook together */
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NG_HOOK_SET_PRIVATE(hook, iface);
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iface->hook = hook;
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/*
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* In most cases traffic accounting is done on an
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* Ethernet interface, so default data link type
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* will be DLT_EN10MB.
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*/
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iface->info.ifinfo_dlt = DLT_EN10MB;
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} else if (strncmp(name, NG_NETFLOW_HOOK_OUT,
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strlen(NG_NETFLOW_HOOK_OUT)) == 0) {
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iface_p iface;
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int ifnum = -1;
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const char *cp;
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char *eptr;
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cp = name + strlen(NG_NETFLOW_HOOK_OUT);
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if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
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return (EINVAL);
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ifnum = (int)strtoul(cp, &eptr, 10);
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if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES)
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return (EINVAL);
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/* See if hook is already connected */
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if (priv->ifaces[ifnum].out != NULL)
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return (EISCONN);
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iface = &priv->ifaces[ifnum];
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/* Link private info and hook together */
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NG_HOOK_SET_PRIVATE(hook, iface);
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iface->out = hook;
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} else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT) == 0) {
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if (priv->export != NULL)
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return (EISCONN);
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priv->export = hook;
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#if 0 /* TODO: profile & test first */
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/*
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* We send export dgrams in interrupt handlers and in
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* callout threads. We'd better queue data for later
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* netgraph ISR processing.
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*/
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NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
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#endif
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/* Exporter is ready. Let's schedule expiry. */
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callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
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(void *)priv);
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} else
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return (EINVAL);
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return (0);
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}
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/* Get a netgraph control message. */
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static int
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ng_netflow_rcvmsg (node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_mesg *msg;
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NGI_GET_MSG(item, msg);
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/* Deal with message according to cookie and command */
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switch (msg->header.typecookie) {
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case NGM_NETFLOW_COOKIE:
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switch (msg->header.cmd) {
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case NGM_NETFLOW_INFO:
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{
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struct ng_netflow_info *i;
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NG_MKRESPONSE(resp, msg, sizeof(struct ng_netflow_info),
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M_NOWAIT);
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i = (struct ng_netflow_info *)resp->data;
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ng_netflow_copyinfo(priv, i);
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break;
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}
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case NGM_NETFLOW_IFINFO:
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{
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struct ng_netflow_ifinfo *i;
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const uint16_t *index;
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if (msg->header.arglen != sizeof(uint16_t))
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ERROUT(EINVAL);
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index = (uint16_t *)msg->data;
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if (*index >= NG_NETFLOW_MAXIFACES)
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ERROUT(EINVAL);
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/* connected iface? */
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if (priv->ifaces[*index].hook == NULL)
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ERROUT(EINVAL);
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NG_MKRESPONSE(resp, msg,
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sizeof(struct ng_netflow_ifinfo), M_NOWAIT);
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i = (struct ng_netflow_ifinfo *)resp->data;
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memcpy((void *)i, (void *)&priv->ifaces[*index].info,
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sizeof(priv->ifaces[*index].info));
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break;
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}
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case NGM_NETFLOW_SETDLT:
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{
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struct ng_netflow_setdlt *set;
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struct ng_netflow_iface *iface;
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if (msg->header.arglen != sizeof(struct ng_netflow_setdlt))
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ERROUT(EINVAL);
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set = (struct ng_netflow_setdlt *)msg->data;
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if (set->iface >= NG_NETFLOW_MAXIFACES)
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ERROUT(EINVAL);
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iface = &priv->ifaces[set->iface];
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/* connected iface? */
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if (iface->hook == NULL)
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ERROUT(EINVAL);
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switch (set->dlt) {
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case DLT_EN10MB:
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iface->info.ifinfo_dlt = DLT_EN10MB;
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break;
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case DLT_RAW:
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iface->info.ifinfo_dlt = DLT_RAW;
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break;
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default:
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ERROUT(EINVAL);
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}
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break;
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}
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case NGM_NETFLOW_SETIFINDEX:
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{
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struct ng_netflow_setifindex *set;
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struct ng_netflow_iface *iface;
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if (msg->header.arglen != sizeof(struct ng_netflow_setifindex))
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ERROUT(EINVAL);
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set = (struct ng_netflow_setifindex *)msg->data;
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if (set->iface >= NG_NETFLOW_MAXIFACES)
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ERROUT(EINVAL);
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iface = &priv->ifaces[set->iface];
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/* connected iface? */
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if (iface->hook == NULL)
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ERROUT(EINVAL);
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iface->info.ifinfo_index = set->index;
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break;
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}
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case NGM_NETFLOW_SETTIMEOUTS:
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{
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struct ng_netflow_settimeouts *set;
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if (msg->header.arglen != sizeof(struct ng_netflow_settimeouts))
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ERROUT(EINVAL);
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set = (struct ng_netflow_settimeouts *)msg->data;
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priv->info.nfinfo_inact_t = set->inactive_timeout;
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priv->info.nfinfo_act_t = set->active_timeout;
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break;
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}
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case NGM_NETFLOW_SHOW:
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{
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uint32_t *last;
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if (msg->header.arglen != sizeof(uint32_t))
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ERROUT(EINVAL);
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last = (uint32_t *)msg->data;
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NG_MKRESPONSE(resp, msg, NGRESP_SIZE, M_NOWAIT);
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if (!resp)
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ERROUT(ENOMEM);
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error = ng_netflow_flow_show(priv, *last, resp);
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break;
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}
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default:
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ERROUT(EINVAL); /* unknown command */
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break;
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}
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break;
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default:
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ERROUT(EINVAL); /* incorrect cookie */
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break;
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}
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/*
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* Take care of synchronous response, if any.
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* Free memory and return.
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*/
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done:
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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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|
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/* Receive data on hook. */
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static int
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ng_netflow_rcvdata (hook_p hook, item_p item)
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{
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const node_p node = NG_HOOK_NODE(hook);
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const priv_p priv = NG_NODE_PRIVATE(node);
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const iface_p iface = NG_HOOK_PRIVATE(hook);
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struct mbuf *m = NULL;
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struct ip *ip;
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int pullup_len = 0;
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int error = 0;
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|
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if (hook == priv->export) {
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/*
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* Data arrived on export hook.
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* This must not happen.
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*/
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log(LOG_ERR, "ng_netflow: incoming data on export hook!\n");
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ERROUT(EINVAL);
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};
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if (hook == iface->out) {
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/*
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* Data arrived on out hook. Bypass it.
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*/
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if (iface->hook == NULL)
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ERROUT(ENOTCONN);
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NG_FWD_ITEM_HOOK(error, item, iface->hook);
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return (error);
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}
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NGI_GET_M(item, m);
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|
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/* Increase counters. */
|
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iface->info.ifinfo_packets++;
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|
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/*
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* Depending on interface data link type and packet contents
|
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* we pullup enough data, so that ng_netflow_flow_add() does not
|
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* need to know about mbuf at all. We keep current length of data
|
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* needed to be contiguous in pullup_len. mtod() is done at the
|
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* very end one more time, since m can had changed after pulluping.
|
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*
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* In case of unrecognized data we don't return error, but just
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* pass data to downstream hook, if it is available.
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*/
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|
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#define M_CHECK(length) do { \
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pullup_len += length; \
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if ((m)->m_pkthdr.len < (pullup_len)) { \
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error = EINVAL; \
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goto bypass; \
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} \
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if ((m)->m_len < (pullup_len) && \
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(((m) = m_pullup((m),(pullup_len))) == NULL)) { \
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error = ENOBUFS; \
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goto done; \
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} \
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} while (0)
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|
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switch (iface->info.ifinfo_dlt) {
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case DLT_EN10MB: /* Ethernet */
|
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{
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struct ether_header *eh;
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uint16_t etype;
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|
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M_CHECK(sizeof(struct ether_header));
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eh = mtod(m, struct ether_header *);
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|
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/* Make sure this is IP frame. */
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etype = ntohs(eh->ether_type);
|
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switch (etype) {
|
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case ETHERTYPE_IP:
|
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M_CHECK(sizeof(struct ip));
|
|
eh = mtod(m, struct ether_header *);
|
|
ip = (struct ip *)(eh + 1);
|
|
break;
|
|
case ETHERTYPE_VLAN:
|
|
{
|
|
struct ether_vlan_header *evh;
|
|
|
|
M_CHECK(sizeof(struct ether_vlan_header) -
|
|
sizeof(struct ether_header));
|
|
evh = mtod(m, struct ether_vlan_header *);
|
|
if (ntohs(evh->evl_proto) == ETHERTYPE_IP) {
|
|
M_CHECK(sizeof(struct ip));
|
|
ip = (struct ip *)(evh + 1);
|
|
break;
|
|
}
|
|
}
|
|
default:
|
|
goto bypass; /* pass this frame */
|
|
}
|
|
break;
|
|
}
|
|
case DLT_RAW: /* IP packets */
|
|
M_CHECK(sizeof(struct ip));
|
|
ip = mtod(m, struct ip *);
|
|
break;
|
|
default:
|
|
goto bypass;
|
|
break;
|
|
}
|
|
|
|
if ((ip->ip_off & htons(IP_OFFMASK)) == 0) {
|
|
/*
|
|
* In case of IP header with options, we haven't pulled
|
|
* up enough, yet.
|
|
*/
|
|
pullup_len += (ip->ip_hl << 2) - sizeof(struct ip);
|
|
|
|
switch (ip->ip_p) {
|
|
case IPPROTO_TCP:
|
|
M_CHECK(sizeof(struct tcphdr));
|
|
break;
|
|
case IPPROTO_UDP:
|
|
M_CHECK(sizeof(struct udphdr));
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (iface->info.ifinfo_dlt) {
|
|
case DLT_EN10MB:
|
|
{
|
|
struct ether_header *eh;
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
switch (ntohs(eh->ether_type)) {
|
|
case ETHERTYPE_IP:
|
|
ip = (struct ip *)(eh + 1);
|
|
break;
|
|
case ETHERTYPE_VLAN:
|
|
{
|
|
struct ether_vlan_header *evh;
|
|
|
|
evh = mtod(m, struct ether_vlan_header *);
|
|
ip = (struct ip *)(evh + 1);
|
|
break;
|
|
}
|
|
default:
|
|
panic("ng_netflow entered deadcode");
|
|
}
|
|
break;
|
|
}
|
|
case DLT_RAW:
|
|
ip = mtod(m, struct ip *);
|
|
break;
|
|
default:
|
|
panic("ng_netflow entered deadcode");
|
|
}
|
|
|
|
#undef M_CHECK
|
|
|
|
error = ng_netflow_flow_add(priv, ip, iface, m->m_pkthdr.rcvif);
|
|
|
|
bypass:
|
|
if (iface->out != NULL) {
|
|
/* XXX: error gets overwritten here */
|
|
NG_FWD_NEW_DATA(error, item, iface->out, m);
|
|
return (error);
|
|
}
|
|
done:
|
|
if (item)
|
|
NG_FREE_ITEM(item);
|
|
if (m)
|
|
NG_FREE_M(m);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* We will be shut down in a moment */
|
|
static int
|
|
ng_netflow_close(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
callout_drain(&priv->exp_callout);
|
|
ng_netflow_cache_flush(priv);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Do local shutdown processing. */
|
|
static int
|
|
ng_netflow_rmnode(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(priv->node);
|
|
|
|
FREE(priv, M_NETGRAPH);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Hook disconnection. */
|
|
static int
|
|
ng_netflow_disconnect(hook_p hook)
|
|
{
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
priv_p priv = NG_NODE_PRIVATE(node);
|
|
iface_p iface = NG_HOOK_PRIVATE(hook);
|
|
|
|
if (iface != NULL) {
|
|
if (iface->hook == hook)
|
|
iface->hook = NULL;
|
|
if (iface->out == hook)
|
|
iface->out = NULL;
|
|
}
|
|
|
|
/* if export hook disconnected stop running expire(). */
|
|
if (hook == priv->export) {
|
|
callout_drain(&priv->exp_callout);
|
|
priv->export = NULL;
|
|
}
|
|
|
|
/* Removal of the last link destroys the node. */
|
|
if (NG_NODE_NUMHOOKS(node) == 0)
|
|
ng_rmnode_self(node);
|
|
|
|
return (0);
|
|
}
|