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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: netflow.c,v 1.41 2004/09/05 11:41:10 glebius Exp $
*/
static const char rcs_id[] =
"@(#) $FreeBSD: release/9.1.0/sys/netgraph/netflow/netflow.c 234557 2012-04-21 19:22:53Z melifaro $";
#include "opt_inet6.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/endian.h>
#include <machine/atomic.h>
#include <machine/stdarg.h>
#include <net/if.h>
#include <net/route.h>
#include <net/ethernet.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 <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/netflow/netflow.h>
#include <netgraph/netflow/netflow_v9.h>
#include <netgraph/netflow/ng_netflow.h>
#define NBUCKETS (65536) /* must be power of 2 */
/* This hash is for TCP or UDP packets. */
#define FULL_HASH(addr1, addr2, port1, port2) \
(((addr1 ^ (addr1 >> 16) ^ \
htons(addr2 ^ (addr2 >> 16))) ^ \
port1 ^ htons(port2)) & \
(NBUCKETS - 1))
/* This hash is for all other IP packets. */
#define ADDR_HASH(addr1, addr2) \
((addr1 ^ (addr1 >> 16) ^ \
htons(addr2 ^ (addr2 >> 16))) & \
(NBUCKETS - 1))
/* Macros to shorten logical constructions */
/* XXX: priv must exist in namespace */
#define INACTIVE(fle) (time_uptime - fle->f.last > priv->info.nfinfo_inact_t)
#define AGED(fle) (time_uptime - fle->f.first > priv->info.nfinfo_act_t)
#define ISFREE(fle) (fle->f.packets == 0)
/*
* 4 is a magical number: statistically number of 4-packet flows is
* bigger than 5,6,7...-packet flows by an order of magnitude. Most UDP/ICMP
* scans are 1 packet (~ 90% of flow cache). TCP scans are 2-packet in case
* of reachable host and 4-packet otherwise.
*/
#define SMALL(fle) (fle->f.packets <= 4)
MALLOC_DECLARE(M_NETFLOW_HASH);
MALLOC_DEFINE(M_NETFLOW_HASH, "netflow_hash", "NetFlow hash");
static int export_add(item_p, struct flow_entry *);
static int export_send(priv_p, fib_export_p, item_p, int);
static int hash_insert(priv_p, struct flow_hash_entry *, struct flow_rec *, int, uint8_t);
#ifdef INET6
static int hash6_insert(priv_p, struct flow_hash_entry *, struct flow6_rec *, int, uint8_t);
#endif
static __inline void expire_flow(priv_p, fib_export_p, struct flow_entry *, int);
/*
* Generate hash for a given flow record.
*
* FIB is not used here, because:
* most VRFS will carry public IPv4 addresses which are unique even
* without FIB private addresses can overlap, but this is worked out
* via flow_rec bcmp() containing fib id. In IPv6 world addresses are
* all globally unique (it's not fully true, there is FC00::/7 for example,
* but chances of address overlap are MUCH smaller)
*/
static __inline uint32_t
ip_hash(struct flow_rec *r)
{
switch (r->r_ip_p) {
case IPPROTO_TCP:
case IPPROTO_UDP:
return FULL_HASH(r->r_src.s_addr, r->r_dst.s_addr,
r->r_sport, r->r_dport);
default:
return ADDR_HASH(r->r_src.s_addr, r->r_dst.s_addr);
}
}
#ifdef INET6
/* Generate hash for a given flow6 record. Use lower 4 octets from v6 addresses */
static __inline uint32_t
ip6_hash(struct flow6_rec *r)
{
switch (r->r_ip_p) {
case IPPROTO_TCP:
case IPPROTO_UDP:
return FULL_HASH(r->src.r_src6.__u6_addr.__u6_addr32[3],
r->dst.r_dst6.__u6_addr.__u6_addr32[3], r->r_sport,
r->r_dport);
default:
return ADDR_HASH(r->src.r_src6.__u6_addr.__u6_addr32[3],
r->dst.r_dst6.__u6_addr.__u6_addr32[3]);
}
}
#endif
/* This is callback from uma(9), called on alloc. */
static int
uma_ctor_flow(void *mem, int size, void *arg, int how)
{
priv_p priv = (priv_p )arg;
if (atomic_load_acq_32(&priv->info.nfinfo_used) >= CACHESIZE)
return (ENOMEM);
atomic_add_32(&priv->info.nfinfo_used, 1);
return (0);
}
/* This is callback from uma(9), called on free. */
static void
uma_dtor_flow(void *mem, int size, void *arg)
{
priv_p priv = (priv_p )arg;
atomic_subtract_32(&priv->info.nfinfo_used, 1);
}
#ifdef INET6
/* This is callback from uma(9), called on alloc. */
static int
uma_ctor_flow6(void *mem, int size, void *arg, int how)
{
priv_p priv = (priv_p )arg;
if (atomic_load_acq_32(&priv->info.nfinfo_used6) >= CACHESIZE)
return (ENOMEM);
atomic_add_32(&priv->info.nfinfo_used6, 1);
return (0);
}
/* This is callback from uma(9), called on free. */
static void
uma_dtor_flow6(void *mem, int size, void *arg)
{
priv_p priv = (priv_p )arg;
atomic_subtract_32(&priv->info.nfinfo_used6, 1);
}
#endif
/*
* Detach export datagram from priv, if there is any.
* If there is no, allocate a new one.
*/
static item_p
get_export_dgram(priv_p priv, fib_export_p fe)
{
item_p item = NULL;
mtx_lock(&fe->export_mtx);
if (fe->exp.item != NULL) {
item = fe->exp.item;
fe->exp.item = NULL;
}
mtx_unlock(&fe->export_mtx);
if (item == NULL) {
struct netflow_v5_export_dgram *dgram;
struct mbuf *m;
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m == NULL)
return (NULL);
item = ng_package_data(m, NG_NOFLAGS);
if (item == NULL)
return (NULL);
dgram = mtod(m, struct netflow_v5_export_dgram *);
dgram->header.count = 0;
dgram->header.version = htons(NETFLOW_V5);
dgram->header.pad = 0;
}
return (item);
}
/*
* Re-attach incomplete datagram back to priv.
* If there is already another one, then send incomplete. */
static void
return_export_dgram(priv_p priv, fib_export_p fe, item_p item, int flags)
{
/*
* It may happen on SMP, that some thread has already
* put its item there, in this case we bail out and
* send what we have to collector.
*/
mtx_lock(&fe->export_mtx);
if (fe->exp.item == NULL) {
fe->exp.item = item;
mtx_unlock(&fe->export_mtx);
} else {
mtx_unlock(&fe->export_mtx);
export_send(priv, fe, item, flags);
}
}
/*
* The flow is over. Call export_add() and free it. If datagram is
* full, then call export_send().
*/
static __inline void
expire_flow(priv_p priv, fib_export_p fe, struct flow_entry *fle, int flags)
{
struct netflow_export_item exp;
uint16_t version = fle->f.version;
if ((priv->export != NULL) && (version == IPVERSION)) {
exp.item = get_export_dgram(priv, fe);
if (exp.item == NULL) {
atomic_add_32(&priv->info.nfinfo_export_failed, 1);
if (priv->export9 != NULL)
atomic_add_32(&priv->info.nfinfo_export9_failed, 1);
/* fle definitely contains IPv4 flow */
uma_zfree_arg(priv->zone, fle, priv);
return;
}
if (export_add(exp.item, fle) > 0)
export_send(priv, fe, exp.item, flags);
else
return_export_dgram(priv, fe, exp.item, NG_QUEUE);
}
if (priv->export9 != NULL) {
exp.item9 = get_export9_dgram(priv, fe, &exp.item9_opt);
if (exp.item9 == NULL) {
atomic_add_32(&priv->info.nfinfo_export9_failed, 1);
if (version == IPVERSION)
uma_zfree_arg(priv->zone, fle, priv);
#ifdef INET6
else if (version == IP6VERSION)
uma_zfree_arg(priv->zone6, fle, priv);
#endif
else
panic("ng_netflow: Unknown IP proto: %d", version);
return;
}
if (export9_add(exp.item9, exp.item9_opt, fle) > 0)
export9_send(priv, fe, exp.item9, exp.item9_opt, flags);
else
return_export9_dgram(priv, fe, exp.item9, exp.item9_opt, NG_QUEUE);
}
if (version == IPVERSION)
uma_zfree_arg(priv->zone, fle, priv);
#ifdef INET6
else if (version == IP6VERSION)
uma_zfree_arg(priv->zone6, fle, priv);
#endif
}
/* Get a snapshot of node statistics */
void
ng_netflow_copyinfo(priv_p priv, struct ng_netflow_info *i)
{
/* XXX: atomic */
memcpy((void *)i, (void *)&priv->info, sizeof(priv->info));
}
/*
* Insert a record into defined slot.
*
* First we get for us a free flow entry, then fill in all
* possible fields in it.
*
* TODO: consider dropping hash mutex while filling in datagram,
* as this was done in previous version. Need to test & profile
* to be sure.
*/
static __inline int
hash_insert(priv_p priv, struct flow_hash_entry *hsh, struct flow_rec *r,
int plen, uint8_t tcp_flags)
{
struct flow_entry *fle;
struct sockaddr_in sin;
struct rtentry *rt;
mtx_assert(&hsh->mtx, MA_OWNED);
fle = uma_zalloc_arg(priv->zone, priv, M_NOWAIT);
if (fle == NULL) {
atomic_add_32(&priv->info.nfinfo_alloc_failed, 1);
return (ENOMEM);
}
/*
* Now fle is totally ours. It is detached from all lists,
* we can safely edit it.
*/
fle->f.version = IPVERSION;
bcopy(r, &fle->f.r, sizeof(struct flow_rec));
fle->f.bytes = plen;
fle->f.packets = 1;
fle->f.tcp_flags = tcp_flags;
fle->f.first = fle->f.last = time_uptime;
/*
* First we do route table lookup on destination address. So we can
* fill in out_ifx, dst_mask, nexthop, and dst_as in future releases.
*/
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_addr = fle->f.r.r_dst;
rt = rtalloc1_fib((struct sockaddr *)&sin, 0, 0, r->fib);
if (rt != NULL) {
fle->f.fle_o_ifx = rt->rt_ifp->if_index;
if (rt->rt_flags & RTF_GATEWAY &&
rt->rt_gateway->sa_family == AF_INET)
fle->f.next_hop =
((struct sockaddr_in *)(rt->rt_gateway))->sin_addr;
if (rt_mask(rt))
fle->f.dst_mask = bitcount32(((struct sockaddr_in *)
rt_mask(rt))->sin_addr.s_addr);
else if (rt->rt_flags & RTF_HOST)
/* Give up. We can't determine mask :( */
fle->f.dst_mask = 32;
RTFREE_LOCKED(rt);
}
/* Do route lookup on source address, to fill in src_mask. */
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_addr = fle->f.r.r_src;
rt = rtalloc1_fib((struct sockaddr *)&sin, 0, 0, r->fib);
if (rt != NULL) {
if (rt_mask(rt))
fle->f.src_mask = bitcount32(((struct sockaddr_in *)
rt_mask(rt))->sin_addr.s_addr);
else if (rt->rt_flags & RTF_HOST)
/* Give up. We can't determine mask :( */
fle->f.src_mask = 32;
RTFREE_LOCKED(rt);
}
/* Push new flow at the and of hash. */
TAILQ_INSERT_TAIL(&hsh->head, fle, fle_hash);
return (0);
}
#ifdef INET6
/* XXX: make normal function, instead of.. */
#define ipv6_masklen(x) bitcount32((x).__u6_addr.__u6_addr32[0]) + \
bitcount32((x).__u6_addr.__u6_addr32[1]) + \
bitcount32((x).__u6_addr.__u6_addr32[2]) + \
bitcount32((x).__u6_addr.__u6_addr32[3])
/* XXX: Do we need inline here ? */
static __inline int
hash6_insert(priv_p priv, struct flow_hash_entry *hsh6, struct flow6_rec *r,
int plen, uint8_t tcp_flags)
{
struct flow6_entry *fle6;
struct sockaddr_in6 *src, *dst;
struct rtentry *rt;
struct route_in6 rin6;
mtx_assert(&hsh6->mtx, MA_OWNED);
fle6 = uma_zalloc_arg(priv->zone6, priv, M_NOWAIT);
if (fle6 == NULL) {
atomic_add_32(&priv->info.nfinfo_alloc_failed, 1);
return (ENOMEM);
}
/*
* Now fle is totally ours. It is detached from all lists,
* we can safely edit it.
*/
fle6->f.version = IP6VERSION;
bcopy(r, &fle6->f.r, sizeof(struct flow6_rec));
fle6->f.bytes = plen;
fle6->f.packets = 1;
fle6->f.tcp_flags = tcp_flags;
fle6->f.first = fle6->f.last = time_uptime;
/*
* First we do route table lookup on destination address. So we can
* fill in out_ifx, dst_mask, nexthop, and dst_as in future releases.
*/
bzero(&rin6, sizeof(struct route_in6));
dst = (struct sockaddr_in6 *)&rin6.ro_dst;
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_family = AF_INET6;
dst->sin6_addr = r->dst.r_dst6;
rin6.ro_rt = rtalloc1_fib((struct sockaddr *)dst, 0, 0, r->fib);
if (rin6.ro_rt != NULL) {
rt = rin6.ro_rt;
fle6->f.fle_o_ifx = rt->rt_ifp->if_index;
if (rt->rt_flags & RTF_GATEWAY &&
rt->rt_gateway->sa_family == AF_INET6)
fle6->f.n.next_hop6 =
((struct sockaddr_in6 *)(rt->rt_gateway))->sin6_addr;
if (rt_mask(rt))
fle6->f.dst_mask = ipv6_masklen(((struct sockaddr_in6 *)rt_mask(rt))->sin6_addr);
else
fle6->f.dst_mask = 128;
RTFREE_LOCKED(rt);
}
/* Do route lookup on source address, to fill in src_mask. */
bzero(&rin6, sizeof(struct route_in6));
src = (struct sockaddr_in6 *)&rin6.ro_dst;
src->sin6_len = sizeof(struct sockaddr_in6);
src->sin6_family = AF_INET6;
src->sin6_addr = r->src.r_src6;
rin6.ro_rt = rtalloc1_fib((struct sockaddr *)src, 0, 0, r->fib);
if (rin6.ro_rt != NULL) {
rt = rin6.ro_rt;
if (rt_mask(rt))
fle6->f.src_mask = ipv6_masklen(((struct sockaddr_in6 *)rt_mask(rt))->sin6_addr);
else
fle6->f.src_mask = 128;
RTFREE_LOCKED(rt);
}
/* Push new flow at the and of hash. */
TAILQ_INSERT_TAIL(&hsh6->head, (struct flow_entry *)fle6, fle_hash);
return (0);
}
#endif
/*
* Non-static functions called from ng_netflow.c
*/
/* Allocate memory and set up flow cache */
void
ng_netflow_cache_init(priv_p priv)
{
struct flow_hash_entry *hsh;
int i;
/* Initialize cache UMA zone. */
priv->zone = uma_zcreate("NetFlow IPv4 cache", sizeof(struct flow_entry),
uma_ctor_flow, uma_dtor_flow, NULL, NULL, UMA_ALIGN_CACHE, 0);
uma_zone_set_max(priv->zone, CACHESIZE);
#ifdef INET6
priv->zone6 = uma_zcreate("NetFlow IPv6 cache", sizeof(struct flow6_entry),
uma_ctor_flow6, uma_dtor_flow6, NULL, NULL, UMA_ALIGN_CACHE, 0);
uma_zone_set_max(priv->zone6, CACHESIZE);
#endif
/* Allocate hash. */
priv->hash = malloc(NBUCKETS * sizeof(struct flow_hash_entry),
M_NETFLOW_HASH, M_WAITOK | M_ZERO);
/* Initialize hash. */
for (i = 0, hsh = priv->hash; i < NBUCKETS; i++, hsh++) {
mtx_init(&hsh->mtx, "hash mutex", NULL, MTX_DEF);
TAILQ_INIT(&hsh->head);
}
#ifdef INET6
/* Allocate hash. */
priv->hash6 = malloc(NBUCKETS * sizeof(struct flow_hash_entry),
M_NETFLOW_HASH, M_WAITOK | M_ZERO);
/* Initialize hash. */
for (i = 0, hsh = priv->hash6; i < NBUCKETS; i++, hsh++) {
mtx_init(&hsh->mtx, "hash mutex", NULL, MTX_DEF);
TAILQ_INIT(&hsh->head);
}
#endif
ng_netflow_v9_cache_init(priv);
CTR0(KTR_NET, "ng_netflow startup()");
}
/* Initialize new FIB table for v5 and v9 */
int
ng_netflow_fib_init(priv_p priv, int fib)
{
fib_export_p fe = priv_to_fib(priv, fib);
CTR1(KTR_NET, "ng_netflow(): fib init: %d", fib);
if (fe != NULL)
return (0);
if ((fe = malloc(sizeof(struct fib_export), M_NETGRAPH, M_NOWAIT | M_ZERO)) == NULL)
return (1);
mtx_init(&fe->export_mtx, "export dgram lock", NULL, MTX_DEF);
mtx_init(&fe->export9_mtx, "export9 dgram lock", NULL, MTX_DEF);
fe->fib = fib;
fe->domain_id = fib;
if (atomic_cmpset_ptr((volatile uintptr_t *)&priv->fib_data[fib], (uintptr_t)NULL, (uintptr_t)fe) == 0) {
/* FIB already set up by other ISR */
CTR3(KTR_NET, "ng_netflow(): fib init: %d setup %p but got %p", fib, fe, priv_to_fib(priv, fib));
mtx_destroy(&fe->export_mtx);
mtx_destroy(&fe->export9_mtx);
free(fe, M_NETGRAPH);
} else {
/* Increase counter for statistics */
CTR3(KTR_NET, "ng_netflow(): fib %d setup to %p (%p)", fib, fe, priv_to_fib(priv, fib));
atomic_fetchadd_32(&priv->info.nfinfo_alloc_fibs, 1);
}
return (0);
}
/* Free all flow cache memory. Called from node close method. */
void
ng_netflow_cache_flush(priv_p priv)
{
struct flow_entry *fle, *fle1;
struct flow_hash_entry *hsh;
struct netflow_export_item exp;
fib_export_p fe;
int i;
bzero(&exp, sizeof(exp));
/*
* We are going to free probably billable data.
* Expire everything before freeing it.
* No locking is required since callout is already drained.
*/
for (hsh = priv->hash, i = 0; i < NBUCKETS; hsh++, i++)
TAILQ_FOREACH_SAFE(fle, &hsh->head, fle_hash, fle1) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
fe = priv_to_fib(priv, fle->f.r.fib);
expire_flow(priv, fe, fle, NG_QUEUE);
}
#ifdef INET6
for (hsh = priv->hash6, i = 0; i < NBUCKETS; hsh++, i++)
TAILQ_FOREACH_SAFE(fle, &hsh->head, fle_hash, fle1) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
fe = priv_to_fib(priv, fle->f.r.fib);
expire_flow(priv, fe, fle, NG_QUEUE);
}
#endif
uma_zdestroy(priv->zone);
/* Destroy hash mutexes. */
for (i = 0, hsh = priv->hash; i < NBUCKETS; i++, hsh++)
mtx_destroy(&hsh->mtx);
/* Free hash memory. */
if (priv->hash != NULL)
free(priv->hash, M_NETFLOW_HASH);
#ifdef INET6
uma_zdestroy(priv->zone6);
/* Destroy hash mutexes. */
for (i = 0, hsh = priv->hash6; i < NBUCKETS; i++, hsh++)
mtx_destroy(&hsh->mtx);
/* Free hash memory. */
if (priv->hash6 != NULL)
free(priv->hash6, M_NETFLOW_HASH);
#endif
for (i = 0; i < priv->maxfibs; i++) {
if ((fe = priv_to_fib(priv, i)) == NULL)
continue;
if (fe->exp.item != NULL)
export_send(priv, fe, fe->exp.item, NG_QUEUE);
if (fe->exp.item9 != NULL)
export9_send(priv, fe, fe->exp.item9, fe->exp.item9_opt, NG_QUEUE);
mtx_destroy(&fe->export_mtx);
mtx_destroy(&fe->export9_mtx);
free(fe, M_NETGRAPH);
}
ng_netflow_v9_cache_flush(priv);
}
/* Insert packet from into flow cache. */
int
ng_netflow_flow_add(priv_p priv, fib_export_p fe, struct ip *ip, caddr_t upper_ptr, uint8_t upper_proto,
uint8_t is_frag, unsigned int src_if_index)
{
register struct flow_entry *fle, *fle1;
struct flow_hash_entry *hsh;
struct flow_rec r;
int hlen, plen;
int error = 0;
uint8_t tcp_flags = 0;
uint16_t eproto;
/* Try to fill flow_rec r */
bzero(&r, sizeof(r));
/* check version */
if (ip->ip_v != IPVERSION)
return (EINVAL);
/* verify min header length */
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip))
return (EINVAL);
eproto = ETHERTYPE_IP;
/* Assume L4 template by default */
r.flow_type = NETFLOW_V9_FLOW_V4_L4;
r.r_src = ip->ip_src;
r.r_dst = ip->ip_dst;
r.fib = fe->fib;
/* save packet length */
plen = ntohs(ip->ip_len);
r.r_ip_p = ip->ip_p;
r.r_tos = ip->ip_tos;
r.r_i_ifx = src_if_index;
/*
* XXX NOTE: only first fragment of fragmented TCP, UDP and
* ICMP packet will be recorded with proper s_port and d_port.
* Following fragments will be recorded simply as IP packet with
* ip_proto = ip->ip_p and s_port, d_port set to zero.
* I know, it looks like bug. But I don't want to re-implement
* ip packet assebmling here. Anyway, (in)famous trafd works this way -
* and nobody complains yet :)
*/
if ((ip->ip_off & htons(IP_OFFMASK)) == 0)
switch(r.r_ip_p) {
case IPPROTO_TCP:
{
register struct tcphdr *tcp;
tcp = (struct tcphdr *)((caddr_t )ip + hlen);
r.r_sport = tcp->th_sport;
r.r_dport = tcp->th_dport;
tcp_flags = tcp->th_flags;
break;
}
case IPPROTO_UDP:
r.r_ports = *(uint32_t *)((caddr_t )ip + hlen);
break;
}
atomic_fetchadd_32(&priv->info.nfinfo_packets, 1);
/* XXX: atomic */
priv->info.nfinfo_bytes += plen;
/* Find hash slot. */
hsh = &priv->hash[ip_hash(&r)];
mtx_lock(&hsh->mtx);
/*
* Go through hash and find our entry. If we encounter an
* entry, that should be expired, purge it. We do a reverse
* search since most active entries are first, and most
* searches are done on most active entries.
*/
TAILQ_FOREACH_REVERSE_SAFE(fle, &hsh->head, fhead, fle_hash, fle1) {
if (bcmp(&r, &fle->f.r, sizeof(struct flow_rec)) == 0)
break;
if ((INACTIVE(fle) && SMALL(fle)) || AGED(fle)) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
expire_flow(priv, priv_to_fib(priv, fle->f.r.fib), fle, NG_QUEUE);
atomic_add_32(&priv->info.nfinfo_act_exp, 1);
}
}
if (fle) { /* An existent entry. */
fle->f.bytes += plen;
fle->f.packets ++;
fle->f.tcp_flags |= tcp_flags;
fle->f.last = time_uptime;
/*
* We have the following reasons to expire flow in active way:
* - it hit active timeout
* - a TCP connection closed
* - it is going to overflow counter
*/
if (tcp_flags & TH_FIN || tcp_flags & TH_RST || AGED(fle) ||
(fle->f.bytes >= (CNTR_MAX - IF_MAXMTU)) ) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
expire_flow(priv, priv_to_fib(priv, fle->f.r.fib), fle, NG_QUEUE);
atomic_add_32(&priv->info.nfinfo_act_exp, 1);
} else {
/*
* It is the newest, move it to the tail,
* if it isn't there already. Next search will
* locate it quicker.
*/
if (fle != TAILQ_LAST(&hsh->head, fhead)) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
TAILQ_INSERT_TAIL(&hsh->head, fle, fle_hash);
}
}
} else /* A new flow entry. */
error = hash_insert(priv, hsh, &r, plen, tcp_flags);
mtx_unlock(&hsh->mtx);
return (error);
}
#ifdef INET6
/* Insert IPv6 packet from into flow cache. */
int
ng_netflow_flow6_add(priv_p priv, fib_export_p fe, struct ip6_hdr *ip6, caddr_t upper_ptr, uint8_t upper_proto,
uint8_t is_frag, unsigned int src_if_index)
{
register struct flow_entry *fle = NULL, *fle1;
register struct flow6_entry *fle6;
struct flow_hash_entry *hsh;
struct flow6_rec r;
int plen;
int error = 0;
uint8_t tcp_flags = 0;
/* check version */
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
return (EINVAL);
bzero(&r, sizeof(r));
r.src.r_src6 = ip6->ip6_src;
r.dst.r_dst6 = ip6->ip6_dst;
r.fib = fe->fib;
/* Assume L4 template by default */
r.flow_type = NETFLOW_V9_FLOW_V6_L4;
/* save packet length */
plen = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr);
/* XXX: set DSCP/CoS value */
#if 0
r.r_tos = ip->ip_tos;
#endif
if (is_frag == 0) {
switch(upper_proto) {
case IPPROTO_TCP:
{
register struct tcphdr *tcp;
tcp = (struct tcphdr *)upper_ptr;
r.r_ports = *(uint32_t *)upper_ptr;
tcp_flags = tcp->th_flags;
break;
}
case IPPROTO_UDP:
case IPPROTO_SCTP:
{
r.r_ports = *(uint32_t *)upper_ptr;
break;
}
}
}
r.r_ip_p = upper_proto;
r.r_i_ifx = src_if_index;
atomic_fetchadd_32(&priv->info.nfinfo_packets6, 1);
/* XXX: atomic */
priv->info.nfinfo_bytes6 += plen;
/* Find hash slot. */
hsh = &priv->hash6[ip6_hash(&r)];
mtx_lock(&hsh->mtx);
/*
* Go through hash and find our entry. If we encounter an
* entry, that should be expired, purge it. We do a reverse
* search since most active entries are first, and most
* searches are done on most active entries.
*/
TAILQ_FOREACH_REVERSE_SAFE(fle, &hsh->head, fhead, fle_hash, fle1) {
if (fle->f.version != IP6VERSION)
continue;
fle6 = (struct flow6_entry *)fle;
if (bcmp(&r, &fle6->f.r, sizeof(struct flow6_rec)) == 0)
break;
if ((INACTIVE(fle6) && SMALL(fle6)) || AGED(fle6)) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
expire_flow(priv, priv_to_fib(priv, fle->f.r.fib), fle,
NG_QUEUE);
atomic_add_32(&priv->info.nfinfo_act_exp, 1);
}
}
if (fle != NULL) { /* An existent entry. */
fle6 = (struct flow6_entry *)fle;
fle6->f.bytes += plen;
fle6->f.packets ++;
fle6->f.tcp_flags |= tcp_flags;
fle6->f.last = time_uptime;
/*
* We have the following reasons to expire flow in active way:
* - it hit active timeout
* - a TCP connection closed
* - it is going to overflow counter
*/
if (tcp_flags & TH_FIN || tcp_flags & TH_RST || AGED(fle6) ||
(fle6->f.bytes >= (CNTR_MAX - IF_MAXMTU)) ) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
expire_flow(priv, priv_to_fib(priv, fle->f.r.fib), fle,
NG_QUEUE);
atomic_add_32(&priv->info.nfinfo_act_exp, 1);
} else {
/*
* It is the newest, move it to the tail,
* if it isn't there already. Next search will
* locate it quicker.
*/
if (fle != TAILQ_LAST(&hsh->head, fhead)) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
TAILQ_INSERT_TAIL(&hsh->head, fle, fle_hash);
}
}
} else /* A new flow entry. */
error = hash6_insert(priv, hsh, &r, plen, tcp_flags);
mtx_unlock(&hsh->mtx);
return (error);
}
#endif
/*
* Return records from cache to userland.
*
* TODO: matching particular IP should be done in kernel, here.
*/
int
ng_netflow_flow_show(priv_p priv, struct ngnf_show_header *req,
struct ngnf_show_header *resp)
{
struct flow_hash_entry *hsh;
struct flow_entry *fle;
struct flow_entry_data *data = (struct flow_entry_data *)(resp + 1);
#ifdef INET6
struct flow6_entry_data *data6 = (struct flow6_entry_data *)(resp + 1);
#endif
int i, max;
i = req->hash_id;
if (i > NBUCKETS-1)
return (EINVAL);
#ifdef INET6
if (req->version == 6) {
resp->version = 6;
hsh = priv->hash6 + i;
max = NREC6_AT_ONCE;
} else
#endif
if (req->version == 4) {
resp->version = 4;
hsh = priv->hash + i;
max = NREC_AT_ONCE;
} else
return (EINVAL);
/*
* We will transfer not more than NREC_AT_ONCE. More data
* will come in next message.
* We send current hash index and current record number in list
* to userland, and userland should return it back to us.
* Then, we will restart with new entry.
*
* The resulting cache snapshot can be inaccurate if flow expiration
* is taking place on hash item between userland data requests for
* this hash item id.
*/
resp->nentries = 0;
for (; i < NBUCKETS; hsh++, i++) {
int list_id;
if (mtx_trylock(&hsh->mtx) == 0) {
/*
* Requested hash index is not available,
* relay decision to skip or re-request data
* to userland.
*/
resp->hash_id = i;
resp->list_id = 0;
return (0);
}
list_id = 0;
TAILQ_FOREACH(fle, &hsh->head, fle_hash) {
if (hsh->mtx.mtx_lock & MTX_CONTESTED) {
resp->hash_id = i;
resp->list_id = list_id;
mtx_unlock(&hsh->mtx);
return (0);
}
list_id++;
/* Search for particular record in list. */
if (req->list_id > 0) {
if (list_id < req->list_id)
continue;
/* Requested list position found. */
req->list_id = 0;
}
#ifdef INET6
if (req->version == 6) {
struct flow6_entry *fle6;
fle6 = (struct flow6_entry *)fle;
bcopy(&fle6->f, data6 + resp->nentries,
sizeof(fle6->f));
} else
#endif
bcopy(&fle->f, data + resp->nentries,
sizeof(fle->f));
resp->nentries++;
if (resp->nentries == max) {
resp->hash_id = i;
/*
* If it was the last item in list
* we simply skip to next hash_id.
*/
resp->list_id = list_id + 1;
mtx_unlock(&hsh->mtx);
return (0);
}
}
mtx_unlock(&hsh->mtx);
}
resp->hash_id = resp->list_id = 0;
return (0);
}
/* We have full datagram in privdata. Send it to export hook. */
static int
export_send(priv_p priv, fib_export_p fe, item_p item, int flags)
{
struct mbuf *m = NGI_M(item);
struct netflow_v5_export_dgram *dgram = mtod(m,
struct netflow_v5_export_dgram *);
struct netflow_v5_header *header = &dgram->header;
struct timespec ts;
int error = 0;
/* Fill mbuf header. */
m->m_len = m->m_pkthdr.len = sizeof(struct netflow_v5_record) *
header->count + sizeof(struct netflow_v5_header);
/* Fill export header. */
header->sys_uptime = htonl(MILLIUPTIME(time_uptime));
getnanotime(&ts);
header->unix_secs = htonl(ts.tv_sec);
header->unix_nsecs = htonl(ts.tv_nsec);
header->engine_type = 0;
header->engine_id = fe->domain_id;
header->pad = 0;
header->flow_seq = htonl(atomic_fetchadd_32(&fe->flow_seq,
header->count));
header->count = htons(header->count);
if (priv->export != NULL)
NG_FWD_ITEM_HOOK_FLAGS(error, item, priv->export, flags);
else
NG_FREE_ITEM(item);
return (error);
}
/* Add export record to dgram. */
static int
export_add(item_p item, struct flow_entry *fle)
{
struct netflow_v5_export_dgram *dgram = mtod(NGI_M(item),
struct netflow_v5_export_dgram *);
struct netflow_v5_header *header = &dgram->header;
struct netflow_v5_record *rec;
rec = &dgram->r[header->count];
header->count ++;
KASSERT(header->count <= NETFLOW_V5_MAX_RECORDS,
("ng_netflow: export too big"));
/* Fill in export record. */
rec->src_addr = fle->f.r.r_src.s_addr;
rec->dst_addr = fle->f.r.r_dst.s_addr;
rec->next_hop = fle->f.next_hop.s_addr;
rec->i_ifx = htons(fle->f.fle_i_ifx);
rec->o_ifx = htons(fle->f.fle_o_ifx);
rec->packets = htonl(fle->f.packets);
rec->octets = htonl(fle->f.bytes);
rec->first = htonl(MILLIUPTIME(fle->f.first));
rec->last = htonl(MILLIUPTIME(fle->f.last));
rec->s_port = fle->f.r.r_sport;
rec->d_port = fle->f.r.r_dport;
rec->flags = fle->f.tcp_flags;
rec->prot = fle->f.r.r_ip_p;
rec->tos = fle->f.r.r_tos;
rec->dst_mask = fle->f.dst_mask;
rec->src_mask = fle->f.src_mask;
rec->pad1 = 0;
rec->pad2 = 0;
/* Not supported fields. */
rec->src_as = rec->dst_as = 0;
if (header->count == NETFLOW_V5_MAX_RECORDS)
return (1); /* end of datagram */
else
return (0);
}
/* Periodic flow expiry run. */
void
ng_netflow_expire(void *arg)
{
struct flow_entry *fle, *fle1;
struct flow_hash_entry *hsh;
priv_p priv = (priv_p )arg;
uint32_t used;
int i;
/*
* Going through all the cache.
*/
for (hsh = priv->hash, i = 0; i < NBUCKETS; hsh++, i++) {
/*
* Skip entries, that are already being worked on.
*/
if (mtx_trylock(&hsh->mtx) == 0)
continue;
used = atomic_load_acq_32(&priv->info.nfinfo_used);
TAILQ_FOREACH_SAFE(fle, &hsh->head, fle_hash, fle1) {
/*
* Interrupt thread wants this entry!
* Quick! Quick! Bail out!
*/
if (hsh->mtx.mtx_lock & MTX_CONTESTED)
break;
/*
* Don't expire aggressively while hash collision
* ratio is predicted small.
*/
if (used <= (NBUCKETS*2) && !INACTIVE(fle))
break;
if ((INACTIVE(fle) && (SMALL(fle) ||
(used > (NBUCKETS*2)))) || AGED(fle)) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
expire_flow(priv, priv_to_fib(priv, fle->f.r.fib), fle, NG_NOFLAGS);
used--;
atomic_add_32(&priv->info.nfinfo_inact_exp, 1);
}
}
mtx_unlock(&hsh->mtx);
}
#ifdef INET6
for (hsh = priv->hash6, i = 0; i < NBUCKETS; hsh++, i++) {
struct flow6_entry *fle6;
/*
* Skip entries, that are already being worked on.
*/
if (mtx_trylock(&hsh->mtx) == 0)
continue;
used = atomic_load_acq_32(&priv->info.nfinfo_used6);
TAILQ_FOREACH_SAFE(fle, &hsh->head, fle_hash, fle1) {
fle6 = (struct flow6_entry *)fle;
/*
* Interrupt thread wants this entry!
* Quick! Quick! Bail out!
*/
if (hsh->mtx.mtx_lock & MTX_CONTESTED)
break;
/*
* Don't expire aggressively while hash collision
* ratio is predicted small.
*/
if (used <= (NBUCKETS*2) && !INACTIVE(fle6))
break;
if ((INACTIVE(fle6) && (SMALL(fle6) ||
(used > (NBUCKETS*2)))) || AGED(fle6)) {
TAILQ_REMOVE(&hsh->head, fle, fle_hash);
expire_flow(priv, priv_to_fib(priv,
fle->f.r.fib), fle, NG_NOFLAGS);
used--;
atomic_add_32(&priv->info.nfinfo_inact_exp, 1);
}
}
mtx_unlock(&hsh->mtx);
}
#endif
/* Schedule next expire. */
callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
(void *)priv);
}