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f-stack/freebsd/netgraph/netflow/ng_netflow.c

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/*-
* Copyright (c) 2010-2011 Alexander V. Chernikov <melifaro@ipfw.ru>
* 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 $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet6.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/counter.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/ctype.h>
#include <vm/uma.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <net/route.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/ip6.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/sctp.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_parse.h>
#include <netgraph/netgraph.h>
#include <netgraph/netflow/netflow.h>
#include <netgraph/netflow/netflow_v9.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
};
/* Parse type for ng_netflow_setconfig */
static const struct ng_parse_struct_field ng_netflow_setconfig_type_fields[]
= NG_NETFLOW_SETCONFIG_TYPE;
static const struct ng_parse_type ng_netflow_setconfig_type = {
&ng_parse_struct_type,
&ng_netflow_setconfig_type_fields
};
/* Parse type for ng_netflow_settemplate */
static const struct ng_parse_struct_field ng_netflow_settemplate_type_fields[]
= NG_NETFLOW_SETTEMPLATE_TYPE;
static const struct ng_parse_type ng_netflow_settemplate_type = {
&ng_parse_struct_type,
&ng_netflow_settemplate_type_fields
};
/* Parse type for ng_netflow_setmtu */
static const struct ng_parse_struct_field ng_netflow_setmtu_type_fields[]
= NG_NETFLOW_SETMTU_TYPE;
static const struct ng_parse_type ng_netflow_setmtu_type = {
&ng_parse_struct_type,
&ng_netflow_setmtu_type_fields
};
/* Parse type for struct ng_netflow_v9info */
static const struct ng_parse_struct_field ng_netflow_v9info_type_fields[]
= NG_NETFLOW_V9INFO_TYPE;
static const struct ng_parse_type ng_netflow_v9info_type = {
&ng_parse_struct_type,
&ng_netflow_v9info_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
},
{
NGM_NETFLOW_COOKIE,
NGM_NETFLOW_SETCONFIG,
"setconfig",
&ng_netflow_setconfig_type,
NULL
},
{
NGM_NETFLOW_COOKIE,
NGM_NETFLOW_SETTEMPLATE,
"settemplate",
&ng_netflow_settemplate_type,
NULL
},
{
NGM_NETFLOW_COOKIE,
NGM_NETFLOW_SETMTU,
"setmtu",
&ng_netflow_setmtu_type,
NULL
},
{
NGM_NETFLOW_COOKIE,
NGM_NETFLOW_V9INFO,
"v9info",
NULL,
&ng_netflow_v9info_type
},
{ 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 i;
/* Initialize private data */
priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
/* Initialize fib data */
priv->maxfibs = rt_numfibs;
priv->fib_data = malloc(sizeof(fib_export_p) * priv->maxfibs,
M_NETGRAPH, M_WAITOK | M_ZERO);
/* Make node and its data point at each other */
NG_NODE_SET_PRIVATE(node, priv);
priv->node = node;
/* Initialize timeouts to default values */
priv->nfinfo_inact_t = INACTIVE_TIMEOUT;
priv->nfinfo_act_t = ACTIVE_TIMEOUT;
/* Set default config */
for (i = 0; i < NG_NETFLOW_MAXIFACES; i++)
priv->ifaces[i].info.conf = NG_NETFLOW_CONF_INGRESS;
/* Initialize callout handle */
callout_init(&priv->exp_callout, 1);
/* Allocate memory and set up flow cache */
ng_netflow_cache_init(priv);
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);
/* Netflow version 5 supports 32-bit counters only */
if (CNTR_MAX == UINT64_MAX)
return (EINVAL);
priv->export = hook;
/* Exporter is ready. Let's schedule expiry. */
callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
(void *)priv);
} else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT9) == 0) {
if (priv->export9 != NULL)
return (EISCONN);
priv->export9 = hook;
/* 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->nfinfo_inact_t = set->inactive_timeout;
priv->nfinfo_act_t = set->active_timeout;
break;
}
case NGM_NETFLOW_SETCONFIG:
{
struct ng_netflow_setconfig *set;
if (msg->header.arglen !=
sizeof(struct ng_netflow_setconfig))
ERROUT(EINVAL);
set = (struct ng_netflow_setconfig *)msg->data;
if (set->iface >= NG_NETFLOW_MAXIFACES)
ERROUT(EINVAL);
priv->ifaces[set->iface].info.conf = set->conf;
break;
}
case NGM_NETFLOW_SETTEMPLATE:
{
struct ng_netflow_settemplate *set;
if (msg->header.arglen !=
sizeof(struct ng_netflow_settemplate))
ERROUT(EINVAL);
set = (struct ng_netflow_settemplate *)msg->data;
priv->templ_packets = set->packets;
priv->templ_time = set->time;
break;
}
case NGM_NETFLOW_SETMTU:
{
struct ng_netflow_setmtu *set;
if (msg->header.arglen !=
sizeof(struct ng_netflow_setmtu))
ERROUT(EINVAL);
set = (struct ng_netflow_setmtu *)msg->data;
if ((set->mtu < MIN_MTU) || (set->mtu > MAX_MTU))
ERROUT(EINVAL);
priv->mtu = set->mtu;
break;
}
case NGM_NETFLOW_SHOW:
if (msg->header.arglen !=
sizeof(struct ngnf_show_header))
ERROUT(EINVAL);
NG_MKRESPONSE(resp, msg, NGRESP_SIZE, M_NOWAIT);
if (!resp)
ERROUT(ENOMEM);
error = ng_netflow_flow_show(priv,
(struct ngnf_show_header *)msg->data,
(struct ngnf_show_header *)resp->data);
if (error)
NG_FREE_MSG(resp);
break;
case NGM_NETFLOW_V9INFO:
{
struct ng_netflow_v9info *i;
NG_MKRESPONSE(resp, msg,
sizeof(struct ng_netflow_v9info), M_NOWAIT);
i = (struct ng_netflow_v9info *)resp->data;
ng_netflow_copyv9info(priv, i);
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);
hook_p out;
struct mbuf *m = NULL, *m_old = NULL;
struct ip *ip = NULL;
struct ip6_hdr *ip6 = NULL;
struct m_tag *mtag;
int pullup_len = 0, off;
uint8_t acct = 0, bypass = 0, flags = 0, upper_proto = 0;
int error = 0, l3_off = 0;
unsigned int src_if_index;
caddr_t upper_ptr = NULL;
fib_export_p fe;
uint32_t fib;
if ((hook == priv->export) || (hook == priv->export9)) {
/*
* 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->hook) {
if ((iface->info.conf & NG_NETFLOW_CONF_INGRESS) == 0)
bypass = 1;
out = iface->out;
} else if (hook == iface->out) {
if ((iface->info.conf & NG_NETFLOW_CONF_EGRESS) == 0)
bypass = 1;
out = iface->hook;
} else
ERROUT(EINVAL);
if ((!bypass) && (iface->info.conf &
(NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE))) {
mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
MTAG_NETFLOW_CALLED, NULL);
while (mtag != NULL) {
if ((iface->info.conf & NG_NETFLOW_CONF_ONCE) ||
((ng_ID_t *)(mtag + 1))[0] == NG_NODE_ID(node)) {
bypass = 1;
break;
}
mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
MTAG_NETFLOW_CALLED, mtag);
}
}
if (bypass) {
if (out == NULL)
ERROUT(ENOTCONN);
NG_FWD_ITEM_HOOK(error, item, out);
return (error);
}
if (iface->info.conf &
(NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE)) {
mtag = m_tag_alloc(MTAG_NETFLOW, MTAG_NETFLOW_CALLED,
sizeof(ng_ID_t), M_NOWAIT);
if (mtag) {
((ng_ID_t *)(mtag + 1))[0] = NG_NODE_ID(node);
m_tag_prepend(NGI_M(item), mtag);
}
}
/* Import configuration flags related to flow creation */
flags = iface->info.conf & NG_NETFLOW_FLOW_FLAGS;
NGI_GET_M(item, m);
m_old = 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)) || \
((pullup_len) > MHLEN)) { \
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);
l3_off = sizeof(struct ether_header);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
/*
* m_pullup() called by M_CHECK() pullups
* kern.ipc.max_protohdr (default 60 bytes)
* which is enough.
*/
M_CHECK(sizeof(struct ip6_hdr));
eh = mtod(m, struct ether_header *);
ip6 = (struct ip6_hdr *)(eh + 1);
l3_off = sizeof(struct ether_header);
break;
#endif
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 *);
etype = ntohs(evh->evl_proto);
l3_off = sizeof(struct ether_vlan_header);
if (etype == ETHERTYPE_IP) {
M_CHECK(sizeof(struct ip));
ip = (struct ip *)(evh + 1);
break;
#ifdef INET6
} else if (etype == ETHERTYPE_IPV6) {
M_CHECK(sizeof(struct ip6_hdr));
ip6 = (struct ip6_hdr *)(evh + 1);
break;
#endif
}
}
default:
goto bypass; /* pass this frame */
}
break;
}
case DLT_RAW: /* IP packets */
M_CHECK(sizeof(struct ip));
ip = mtod(m, struct ip *);
/* l3_off is already zero */
#ifdef INET6
/*
* If INET6 is not defined IPv6 packets
* will be discarded in ng_netflow_flow_add().
*/
if (ip->ip_v == IP6VERSION) {
ip = NULL;
M_CHECK(sizeof(struct ip6_hdr) - sizeof(struct ip));
ip6 = mtod(m, struct ip6_hdr *);
}
#endif
break;
default:
goto bypass;
break;
}
off = pullup_len;
if ((ip != NULL) && ((ip->ip_off & htons(IP_OFFMASK)) == 0)) {
if ((ip->ip_v != IPVERSION) ||
((ip->ip_hl << 2) < sizeof(struct ip)))
goto bypass;
/*
* In case of IPv4 header with options, we haven't pulled
* up enough, yet.
*/
M_CHECK((ip->ip_hl << 2) - sizeof(struct ip));
/* Save upper layer offset and proto */
off = pullup_len;
upper_proto = ip->ip_p;
/*
* XXX: in case of wrong upper layer header we will
* forward this packet but skip this record in netflow.
*/
switch (ip->ip_p) {
case IPPROTO_TCP:
M_CHECK(sizeof(struct tcphdr));
break;
case IPPROTO_UDP:
M_CHECK(sizeof(struct udphdr));
break;
case IPPROTO_SCTP:
M_CHECK(sizeof(struct sctphdr));
break;
}
} else if (ip != NULL) {
/*
* Nothing to save except upper layer proto,
* since this is a packet fragment.
*/
flags |= NG_NETFLOW_IS_FRAG;
upper_proto = ip->ip_p;
if ((ip->ip_v != IPVERSION) ||
((ip->ip_hl << 2) < sizeof(struct ip)))
goto bypass;
#ifdef INET6
} else if (ip6 != NULL) {
int cur = ip6->ip6_nxt, hdr_off = 0;
struct ip6_ext *ip6e;
struct ip6_frag *ip6f;
if (priv->export9 == NULL)
goto bypass;
/* Save upper layer info. */
off = pullup_len;
upper_proto = cur;
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
goto bypass;
/*
* Loop through IPv6 extended headers to get upper
* layer header / frag.
*/
for (;;) {
switch (cur) {
/*
* Same as in IPv4, we can forward a 'bad'
* packet without accounting.
*/
case IPPROTO_TCP:
M_CHECK(sizeof(struct tcphdr));
goto loopend;
case IPPROTO_UDP:
M_CHECK(sizeof(struct udphdr));
goto loopend;
case IPPROTO_SCTP:
M_CHECK(sizeof(struct sctphdr));
goto loopend;
/* Loop until 'real' upper layer headers */
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS:
M_CHECK(sizeof(struct ip6_ext));
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) +
off);
upper_proto = ip6e->ip6e_nxt;
hdr_off = (ip6e->ip6e_len + 1) << 3;
break;
/* RFC4302, can be before DSTOPTS */
case IPPROTO_AH:
M_CHECK(sizeof(struct ip6_ext));
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) +
off);
upper_proto = ip6e->ip6e_nxt;
hdr_off = (ip6e->ip6e_len + 2) << 2;
break;
case IPPROTO_FRAGMENT:
M_CHECK(sizeof(struct ip6_frag));
ip6f = (struct ip6_frag *)(mtod(m, caddr_t) +
off);
upper_proto = ip6f->ip6f_nxt;
hdr_off = sizeof(struct ip6_frag);
off += hdr_off;
flags |= NG_NETFLOW_IS_FRAG;
goto loopend;
#if 0
case IPPROTO_NONE:
goto loopend;
#endif
/*
* Any unknown header (new extension or IPv6/IPv4
* header for tunnels) ends loop.
*/
default:
goto loopend;
}
off += hdr_off;
cur = upper_proto;
}
#endif
}
#undef M_CHECK
#ifdef INET6
loopend:
#endif
/* Just in case of real reallocation in M_CHECK() / m_pullup() */
if (m != m_old) {
priv->nfinfo_realloc_mbuf++;
/* Restore ip/ipv6 pointer */
if (ip != NULL)
ip = (struct ip *)(mtod(m, caddr_t) + l3_off);
else if (ip6 != NULL)
ip6 = (struct ip6_hdr *)(mtod(m, caddr_t) + l3_off);
}
upper_ptr = (caddr_t)(mtod(m, caddr_t) + off);
/* Determine packet input interface. Prefer configured. */
src_if_index = 0;
if (hook == iface->out || iface->info.ifinfo_index == 0) {
if (m->m_pkthdr.rcvif != NULL)
src_if_index = m->m_pkthdr.rcvif->if_index;
} else
src_if_index = iface->info.ifinfo_index;
/* Check packet FIB */
fib = M_GETFIB(m);
if (fib >= priv->maxfibs) {
CTR2(KTR_NET, "ng_netflow_rcvdata(): packet fib %d is out of "
"range of available fibs: 0 .. %d",
fib, priv->maxfibs);
goto bypass;
}
if ((fe = priv_to_fib(priv, fib)) == NULL) {
/* Setup new FIB */
if (ng_netflow_fib_init(priv, fib) != 0) {
/* malloc() failed */
goto bypass;
}
fe = priv_to_fib(priv, fib);
}
if (ip != NULL)
error = ng_netflow_flow_add(priv, fe, ip, upper_ptr,
upper_proto, flags, src_if_index);
#ifdef INET6
else if (ip6 != NULL)
error = ng_netflow_flow6_add(priv, fe, ip6, upper_ptr,
upper_proto, flags, src_if_index);
#endif
else
goto bypass;
acct = 1;
bypass:
if (out != NULL) {
if (acct == 0) {
/* Accounting failure */
if (ip != NULL) {
counter_u64_add(priv->nfinfo_spackets, 1);
counter_u64_add(priv->nfinfo_sbytes,
m->m_pkthdr.len);
} else if (ip6 != NULL) {
counter_u64_add(priv->nfinfo_spackets6, 1);
counter_u64_add(priv->nfinfo_sbytes6,
m->m_pkthdr.len);
}
}
/* XXX: error gets overwritten here */
NG_FWD_NEW_DATA(error, item, 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->fib_data, M_NETGRAPH);
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) {
if (priv->export9 == NULL)
callout_drain(&priv->exp_callout);
priv->export = NULL;
}
if (hook == priv->export9) {
if (priv->export == NULL)
callout_drain(&priv->exp_callout);
priv->export9 = NULL;
}
/* Removal of the last link destroys the node. */
if (NG_NODE_NUMHOOKS(node) == 0)
ng_rmnode_self(node);
return (0);
}
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