freebsd-nq/sys/netgraph/netflow/ng_netflow.c

665 lines
16 KiB
C
Raw Normal View History

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