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freebsd-nq/sys/netpfil/ipfw/nat64/nat64lsn.c
Andrey V. Elsukov 782360dec3 Bring in some last changes in NAT64 implementation: 
o Modify ipfw(8) to be able set any prefix6 not just Well-Known,
  and also show configured prefix6;
o relocate some definitions and macros into proper place;
o convert nat64_debug and nat64_allow_private variables to be
  VNET-compatible;
o add struct nat64_config that keeps generic configuration needed
  to NAT64 code;
o add nat64_check_prefix6() function to check validness of specified
  by user IPv6 prefix according to RFC6052;
o use nat64_check_private_ip4() and nat64_embed_ip4() functions
  instead of nat64_get_ip4() and nat64_set_ip4() macros. This allows
  to use any configured IPv6 prefixes that are allowed by RFC6052;
o introduce NAT64_WKPFX flag, that is set when IPv6 prefix is
  Well-Known IPv6 prefix. It is used to reduce overhead to check this;
o modify nat64lsn_cfg and nat64stl_cfg structures to use nat64_config
  structure. And respectivelly modify the rest of code;
o remove now unused ro argument from nat64_output() function;
o remove __FreeBSD_version ifdef, NAT64 was not merged to older versions;
o add commented -DIPFIREWALL_NAT64_DIRECT_OUTPUT flag to module's Makefile
  as example.

Obtained from:	Yandex LLC
MFC after:	1 month
Sponsored by:	Yandex LLC
2018-05-09 11:59:24 +00:00

1767 lines
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/*-
* Copyright (c) 2015-2016 Yandex LLC
* Copyright (c) 2015 Alexander V. Chernikov <melifaro@FreeBSD.org>
* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
* 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 ``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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/counter.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/rmlock.h>
#include <sys/rwlock.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_pflog.h>
#include <net/pfil.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_fw.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip_fw_nat64.h>
#include <netpfil/ipfw/ip_fw_private.h>
#include <netpfil/pf/pf.h>
#include "nat64lsn.h"
MALLOC_DEFINE(M_NAT64LSN, "NAT64LSN", "NAT64LSN");
static void nat64lsn_periodic(void *data);
#define PERIODIC_DELAY 4
static uint8_t nat64lsn_proto_map[256];
uint8_t nat64lsn_rproto_map[NAT_MAX_PROTO];
#define NAT64_FLAG_FIN 0x01 /* FIN was seen */
#define NAT64_FLAG_SYN 0x02 /* First syn in->out */
#define NAT64_FLAG_ESTAB 0x04 /* Packet with Ack */
#define NAT64_FLAGS_TCP (NAT64_FLAG_SYN|NAT64_FLAG_ESTAB|NAT64_FLAG_FIN)
#define NAT64_FLAG_RDR 0x80 /* Port redirect */
#define NAT64_LOOKUP(chain, cmd) \
(struct nat64lsn_cfg *)SRV_OBJECT((chain), (cmd)->arg1)
/*
* Delayed job queue, used to create new hosts
* and new portgroups
*/
enum nat64lsn_jtype {
JTYPE_NEWHOST = 1,
JTYPE_NEWPORTGROUP,
JTYPE_DELPORTGROUP,
};
struct nat64lsn_job_item {
TAILQ_ENTRY(nat64lsn_job_item) next;
enum nat64lsn_jtype jtype;
struct nat64lsn_host *nh;
struct nat64lsn_portgroup *pg;
void *spare_idx;
struct in6_addr haddr;
uint8_t nat_proto;
uint8_t done;
int needs_idx;
int delcount;
unsigned int fhash; /* Flow hash */
uint32_t aaddr; /* Last used address (net) */
struct mbuf *m;
struct ipfw_flow_id f_id;
uint64_t delmask[NAT64LSN_PGPTRNMASK];
};
static struct mtx jmtx;
#define JQUEUE_LOCK_INIT() mtx_init(&jmtx, "qlock", NULL, MTX_DEF)
#define JQUEUE_LOCK_DESTROY() mtx_destroy(&jmtx)
#define JQUEUE_LOCK() mtx_lock(&jmtx)
#define JQUEUE_UNLOCK() mtx_unlock(&jmtx)
static void nat64lsn_enqueue_job(struct nat64lsn_cfg *cfg,
struct nat64lsn_job_item *ji);
static void nat64lsn_enqueue_jobs(struct nat64lsn_cfg *cfg,
struct nat64lsn_job_head *jhead, int jlen);
static struct nat64lsn_job_item *nat64lsn_create_job(struct nat64lsn_cfg *cfg,
const struct ipfw_flow_id *f_id, int jtype);
static int nat64lsn_request_portgroup(struct nat64lsn_cfg *cfg,
const struct ipfw_flow_id *f_id, struct mbuf **pm, uint32_t aaddr,
int needs_idx);
static int nat64lsn_request_host(struct nat64lsn_cfg *cfg,
const struct ipfw_flow_id *f_id, struct mbuf **pm);
static int nat64lsn_translate4(struct nat64lsn_cfg *cfg,
const struct ipfw_flow_id *f_id, struct mbuf **pm);
static int nat64lsn_translate6(struct nat64lsn_cfg *cfg,
struct ipfw_flow_id *f_id, struct mbuf **pm);
static int alloc_portgroup(struct nat64lsn_job_item *ji);
static void destroy_portgroup(struct nat64lsn_portgroup *pg);
static void destroy_host6(struct nat64lsn_host *nh);
static int alloc_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji);
static int attach_portgroup(struct nat64lsn_cfg *cfg,
struct nat64lsn_job_item *ji);
static int attach_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji);
/* XXX tmp */
static uma_zone_t nat64lsn_host_zone;
static uma_zone_t nat64lsn_pg_zone;
static uma_zone_t nat64lsn_pgidx_zone;
static unsigned int nat64lsn_periodic_chkstates(struct nat64lsn_cfg *cfg,
struct nat64lsn_host *nh);
#define I6_hash(x) (djb_hash((const unsigned char *)(x), 16))
#define I6_first(_ph, h) (_ph)[h]
#define I6_next(x) (x)->next
#define I6_val(x) (&(x)->addr)
#define I6_cmp(a, b) IN6_ARE_ADDR_EQUAL(a, b)
#define I6_lock(a, b)
#define I6_unlock(a, b)
#define I6HASH_FIND(_cfg, _res, _a) \
CHT_FIND(_cfg->ih, _cfg->ihsize, I6_, _res, _a)
#define I6HASH_INSERT(_cfg, _i) \
CHT_INSERT_HEAD(_cfg->ih, _cfg->ihsize, I6_, _i)
#define I6HASH_REMOVE(_cfg, _res, _tmp, _a) \
CHT_REMOVE(_cfg->ih, _cfg->ihsize, I6_, _res, _tmp, _a)
#define I6HASH_FOREACH_SAFE(_cfg, _x, _tmp, _cb, _arg) \
CHT_FOREACH_SAFE(_cfg->ih, _cfg->ihsize, I6_, _x, _tmp, _cb, _arg)
#define HASH_IN4(x) djb_hash((const unsigned char *)(x), 8)
static unsigned
djb_hash(const unsigned char *h, const int len)
{
unsigned int result = 0;
int i;
for (i = 0; i < len; i++)
result = 33 * result ^ h[i];
return (result);
}
/*
static size_t
bitmask_size(size_t num, int *level)
{
size_t x;
int c;
for (c = 0, x = num; num > 1; num /= 64, c++)
;
return (x);
}
static void
bitmask_prepare(uint64_t *pmask, size_t bufsize, int level)
{
size_t x, z;
memset(pmask, 0xFF, bufsize);
for (x = 0, z = 1; level > 1; x += z, z *= 64, level--)
;
pmask[x] ~= 0x01;
}
*/
static void
nat64lsn_log(struct pfloghdr *plog, struct mbuf *m, sa_family_t family,
uint32_t n, uint32_t sn)
{
memset(plog, 0, sizeof(*plog));
plog->length = PFLOG_REAL_HDRLEN;
plog->af = family;
plog->action = PF_NAT;
plog->dir = PF_IN;
plog->rulenr = htonl(n);
plog->subrulenr = htonl(sn);
plog->ruleset[0] = '\0';
strlcpy(plog->ifname, "NAT64LSN", sizeof(plog->ifname));
ipfw_bpf_mtap2(plog, PFLOG_HDRLEN, m);
}
/*
* Inspects icmp packets to see if the message contains different
* packet header so we need to alter @addr and @port.
*/
static int
inspect_icmp_mbuf(struct mbuf **m, uint8_t *nat_proto, uint32_t *addr,
uint16_t *port)
{
struct ip *ip;
struct tcphdr *tcp;
struct udphdr *udp;
struct icmphdr *icmp;
int off;
uint8_t proto;
ip = mtod(*m, struct ip *); /* Outer IP header */
off = (ip->ip_hl << 2) + ICMP_MINLEN;
if ((*m)->m_len < off)
*m = m_pullup(*m, off);
if (*m == NULL)
return (ENOMEM);
ip = mtod(*m, struct ip *); /* Outer IP header */
icmp = L3HDR(ip, struct icmphdr *);
switch (icmp->icmp_type) {
case ICMP_ECHO:
case ICMP_ECHOREPLY:
/* Use icmp ID as distinguisher */
*port = ntohs(*((uint16_t *)(icmp + 1)));
return (0);
case ICMP_UNREACH:
case ICMP_TIMXCEED:
break;
default:
return (EOPNOTSUPP);
}
/*
* ICMP_UNREACH and ICMP_TIMXCEED contains IP header + 64 bits
* of ULP header.
*/
if ((*m)->m_pkthdr.len < off + sizeof(struct ip) + ICMP_MINLEN)
return (EINVAL);
if ((*m)->m_len < off + sizeof(struct ip) + ICMP_MINLEN)
*m = m_pullup(*m, off + sizeof(struct ip) + ICMP_MINLEN);
if (*m == NULL)
return (ENOMEM);
ip = mtodo(*m, off); /* Inner IP header */
proto = ip->ip_p;
off += ip->ip_hl << 2; /* Skip inner IP header */
*addr = ntohl(ip->ip_src.s_addr);
if ((*m)->m_len < off + ICMP_MINLEN)
*m = m_pullup(*m, off + ICMP_MINLEN);
if (*m == NULL)
return (ENOMEM);
switch (proto) {
case IPPROTO_TCP:
tcp = mtodo(*m, off);
*nat_proto = NAT_PROTO_TCP;
*port = ntohs(tcp->th_sport);
return (0);
case IPPROTO_UDP:
udp = mtodo(*m, off);
*nat_proto = NAT_PROTO_UDP;
*port = ntohs(udp->uh_sport);
return (0);
case IPPROTO_ICMP:
/*
* We will translate only ICMP errors for our ICMP
* echo requests.
*/
icmp = mtodo(*m, off);
if (icmp->icmp_type != ICMP_ECHO)
return (EOPNOTSUPP);
*port = ntohs(*((uint16_t *)(icmp + 1)));
return (0);
};
return (EOPNOTSUPP);
}
static inline uint8_t
convert_tcp_flags(uint8_t flags)
{
uint8_t result;
result = flags & (TH_FIN|TH_SYN);
result |= (flags & TH_RST) >> 2; /* Treat RST as FIN */
result |= (flags & TH_ACK) >> 2; /* Treat ACK as estab */
return (result);
}
static NAT64NOINLINE int
nat64lsn_translate4(struct nat64lsn_cfg *cfg, const struct ipfw_flow_id *f_id,
struct mbuf **pm)
{
struct pfloghdr loghdr, *logdata;
struct in6_addr src6;
struct nat64lsn_portgroup *pg;
struct nat64lsn_host *nh;
struct nat64lsn_state *st;
struct ip *ip;
uint32_t addr;
uint16_t state_flags, state_ts;
uint16_t port, lport;
uint8_t nat_proto;
int ret;
addr = f_id->dst_ip;
port = f_id->dst_port;
if (addr < cfg->prefix4 || addr > cfg->pmask4) {
NAT64STAT_INC(&cfg->base.stats, nomatch4);
return (cfg->nomatch_verdict);
}
/* Check if protocol is supported and get its short id */
nat_proto = nat64lsn_proto_map[f_id->proto];
if (nat_proto == 0) {
NAT64STAT_INC(&cfg->base.stats, noproto);
return (cfg->nomatch_verdict);
}
/* We might need to handle icmp differently */
if (nat_proto == NAT_PROTO_ICMP) {
ret = inspect_icmp_mbuf(pm, &nat_proto, &addr, &port);
if (ret != 0) {
if (ret == ENOMEM) {
NAT64STAT_INC(&cfg->base.stats, nomem);
return (IP_FW_DENY);
}
NAT64STAT_INC(&cfg->base.stats, noproto);
return (cfg->nomatch_verdict);
}
/* XXX: Check addr for validity */
if (addr < cfg->prefix4 || addr > cfg->pmask4) {
NAT64STAT_INC(&cfg->base.stats, nomatch4);
return (cfg->nomatch_verdict);
}
}
/* Calc portgroup offset w.r.t protocol */
pg = GET_PORTGROUP(cfg, addr, nat_proto, port);
/* Check if this port is occupied by any portgroup */
if (pg == NULL) {
NAT64STAT_INC(&cfg->base.stats, nomatch4);
#if 0
DPRINTF(DP_STATE, "NOMATCH %u %d %d (%d)", addr, nat_proto, port,
_GET_PORTGROUP_IDX(cfg, addr, nat_proto, port));
#endif
return (cfg->nomatch_verdict);
}
/* TODO: Check flags to see if we need to do some static mapping */
nh = pg->host;
/* Prepare some fields we might need to update */
SET_AGE(state_ts);
ip = mtod(*pm, struct ip *);
if (ip->ip_p == IPPROTO_TCP)
state_flags = convert_tcp_flags(
L3HDR(ip, struct tcphdr *)->th_flags);
else
state_flags = 0;
/* Lock host and get port mapping */
NAT64_LOCK(nh);
st = &pg->states[port & (NAT64_CHUNK_SIZE - 1)];
if (st->timestamp != state_ts)
st->timestamp = state_ts;
if ((st->flags & state_flags) != state_flags)
st->flags |= state_flags;
lport = htons(st->u.s.lport);
NAT64_UNLOCK(nh);
if (cfg->base.flags & NAT64_LOG) {
logdata = &loghdr;
nat64lsn_log(logdata, *pm, AF_INET, pg->idx, st->cur.off);
} else
logdata = NULL;
nat64_embed_ip4(&cfg->base, htonl(f_id->src_ip), &src6);
ret = nat64_do_handle_ip4(*pm, &src6, &nh->addr, lport,
&cfg->base, logdata);
if (ret == NAT64SKIP)
return (cfg->nomatch_verdict);
if (ret == NAT64MFREE)
m_freem(*pm);
*pm = NULL;
return (IP_FW_DENY);
}
void
nat64lsn_dump_state(const struct nat64lsn_cfg *cfg,
const struct nat64lsn_portgroup *pg, const struct nat64lsn_state *st,
const char *px, int off)
{
char s[INET6_ADDRSTRLEN], a[INET_ADDRSTRLEN], d[INET_ADDRSTRLEN];
if ((V_nat64_debug & DP_STATE) == 0)
return;
inet_ntop(AF_INET6, &pg->host->addr, s, sizeof(s));
inet_ntop(AF_INET, &pg->aaddr, a, sizeof(a));
inet_ntop(AF_INET, &st->u.s.faddr, d, sizeof(d));
DPRINTF(DP_STATE, "%s: PG %d ST [%p|%d]: %s:%d/%d <%s:%d> "
"%s:%d AGE %d", px, pg->idx, st, off,
s, st->u.s.lport, pg->nat_proto, a, pg->aport + off,
d, st->u.s.fport, GET_AGE(st->timestamp));
}
/*
* Check if particular TCP state is stale and should be deleted.
* Return 1 if true, 0 otherwise.
*/
static int
nat64lsn_periodic_check_tcp(const struct nat64lsn_cfg *cfg,
const struct nat64lsn_state *st, int age)
{
int ttl;
if (st->flags & NAT64_FLAG_FIN)
ttl = cfg->st_close_ttl;
else if (st->flags & NAT64_FLAG_ESTAB)
ttl = cfg->st_estab_ttl;
else if (st->flags & NAT64_FLAG_SYN)
ttl = cfg->st_syn_ttl;
else
ttl = cfg->st_syn_ttl;
if (age > ttl)
return (1);
return (0);
}
/*
* Check if nat state @st is stale and should be deleted.
* Return 1 if true, 0 otherwise.
*/
static NAT64NOINLINE int
nat64lsn_periodic_chkstate(const struct nat64lsn_cfg *cfg,
const struct nat64lsn_portgroup *pg, const struct nat64lsn_state *st)
{
int age, delete;
age = GET_AGE(st->timestamp);
delete = 0;
/* Skip immutable records */
if (st->flags & NAT64_FLAG_RDR)
return (0);
switch (pg->nat_proto) {
case NAT_PROTO_TCP:
delete = nat64lsn_periodic_check_tcp(cfg, st, age);
break;
case NAT_PROTO_UDP:
if (age > cfg->st_udp_ttl)
delete = 1;
break;
case NAT_PROTO_ICMP:
if (age > cfg->st_icmp_ttl)
delete = 1;
break;
}
return (delete);
}
/*
* The following structures and functions
* are used to perform SLIST_FOREACH_SAFE()
* analog for states identified by struct st_ptr.
*/
struct st_idx {
struct nat64lsn_portgroup *pg;
struct nat64lsn_state *st;
struct st_ptr sidx_next;
};
static struct st_idx *
st_first(const struct nat64lsn_cfg *cfg, const struct nat64lsn_host *nh,
struct st_ptr *sidx, struct st_idx *si)
{
struct nat64lsn_portgroup *pg;
struct nat64lsn_state *st;
if (sidx->idx == 0) {
memset(si, 0, sizeof(*si));
return (si);
}
pg = PORTGROUP_BYSIDX(cfg, nh, sidx->idx);
st = &pg->states[sidx->off];
si->pg = pg;
si->st = st;
si->sidx_next = st->next;
return (si);
}
static struct st_idx *
st_next(const struct nat64lsn_cfg *cfg, const struct nat64lsn_host *nh,
struct st_idx *si)
{
struct st_ptr sidx;
struct nat64lsn_portgroup *pg;
struct nat64lsn_state *st;
sidx = si->sidx_next;
if (sidx.idx == 0) {
memset(si, 0, sizeof(*si));
si->st = NULL;
si->pg = NULL;
return (si);
}
pg = PORTGROUP_BYSIDX(cfg, nh, sidx.idx);
st = &pg->states[sidx.off];
si->pg = pg;
si->st = st;
si->sidx_next = st->next;
return (si);
}
static struct st_idx *
st_save_cond(struct st_idx *si_dst, struct st_idx *si)
{
if (si->st != NULL)
*si_dst = *si;
return (si_dst);
}
unsigned int
nat64lsn_periodic_chkstates(struct nat64lsn_cfg *cfg, struct nat64lsn_host *nh)
{
struct st_idx si, si_prev;
int i;
unsigned int delcount;
delcount = 0;
for (i = 0; i < nh->hsize; i++) {
memset(&si_prev, 0, sizeof(si_prev));
for (st_first(cfg, nh, &nh->phash[i], &si);
si.st != NULL;
st_save_cond(&si_prev, &si), st_next(cfg, nh, &si)) {
if (nat64lsn_periodic_chkstate(cfg, si.pg, si.st) == 0)
continue;
nat64lsn_dump_state(cfg, si.pg, si.st, "DELETE STATE",
si.st->cur.off);
/* Unlink from hash */
if (si_prev.st != NULL)
si_prev.st->next = si.st->next;
else
nh->phash[i] = si.st->next;
/* Delete state and free its data */
PG_MARK_FREE_IDX(si.pg, si.st->cur.off);
memset(si.st, 0, sizeof(struct nat64lsn_state));
si.st = NULL;
delcount++;
/* Update portgroup timestamp */
SET_AGE(si.pg->timestamp);
}
}
NAT64STAT_ADD(&cfg->base.stats, sdeleted, delcount);
return (delcount);
}
/*
* Checks if portgroup is not used and can be deleted,
* Returns 1 if stale, 0 otherwise
*/
static int
stale_pg(const struct nat64lsn_cfg *cfg, const struct nat64lsn_portgroup *pg)
{
if (!PG_IS_EMPTY(pg))
return (0);
if (GET_AGE(pg->timestamp) < cfg->pg_delete_delay)
return (0);
return (1);
}
/*
* Checks if host record is not used and can be deleted,
* Returns 1 if stale, 0 otherwise
*/
static int
stale_nh(const struct nat64lsn_cfg *cfg, const struct nat64lsn_host *nh)
{
if (nh->pg_used != 0)
return (0);
if (GET_AGE(nh->timestamp) < cfg->nh_delete_delay)
return (0);
return (1);
}
struct nat64lsn_periodic_data {
struct nat64lsn_cfg *cfg;
struct nat64lsn_job_head jhead;
int jlen;
};
static NAT64NOINLINE int
nat64lsn_periodic_chkhost(struct nat64lsn_host *nh,
struct nat64lsn_periodic_data *d)
{
char a[INET6_ADDRSTRLEN];
struct nat64lsn_portgroup *pg;
struct nat64lsn_job_item *ji;
uint64_t delmask[NAT64LSN_PGPTRNMASK];
int delcount, i;
delcount = 0;
memset(delmask, 0, sizeof(delmask));
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_JQUEUE, "Checking %s host %s on cpu %d",
stale_nh(d->cfg, nh) ? "stale" : "non-stale", a, curcpu);
if (!stale_nh(d->cfg, nh)) {
/* Non-stale host. Inspect internals */
NAT64_LOCK(nh);
/* Stage 1: Check&expire states */
if (nat64lsn_periodic_chkstates(d->cfg, nh) != 0)
SET_AGE(nh->timestamp);
/* Stage 2: Check if we need to expire */
for (i = 0; i < nh->pg_used; i++) {
pg = PORTGROUP_BYSIDX(d->cfg, nh, i + 1);
if (pg == NULL)
continue;
/* Check if we can delete portgroup */
if (stale_pg(d->cfg, pg) == 0)
continue;
DPRINTF(DP_JQUEUE, "Check PG %d", i);
delmask[i / 64] |= ((uint64_t)1 << (i % 64));
delcount++;
}
NAT64_UNLOCK(nh);
if (delcount == 0)
return (0);
}
DPRINTF(DP_JQUEUE, "Queueing %d portgroups for deleting", delcount);
/* We have something to delete - add it to queue */
ji = nat64lsn_create_job(d->cfg, NULL, JTYPE_DELPORTGROUP);
if (ji == NULL)
return (0);
ji->haddr = nh->addr;
ji->delcount = delcount;
memcpy(ji->delmask, delmask, sizeof(ji->delmask));
TAILQ_INSERT_TAIL(&d->jhead, ji, next);
d->jlen++;
return (0);
}
/*
* This procedure is used to perform various maintance
* on dynamic hash list. Currently it is called every second.
*/
static void
nat64lsn_periodic(void *data)
{
struct ip_fw_chain *ch;
IPFW_RLOCK_TRACKER;
struct nat64lsn_cfg *cfg;
struct nat64lsn_periodic_data d;
struct nat64lsn_host *nh, *tmp;
cfg = (struct nat64lsn_cfg *) data;
ch = cfg->ch;
CURVNET_SET(cfg->vp);
memset(&d, 0, sizeof(d));
d.cfg = cfg;
TAILQ_INIT(&d.jhead);
IPFW_RLOCK(ch);
/* Stage 1: foreach host, check all its portgroups */
I6HASH_FOREACH_SAFE(cfg, nh, tmp, nat64lsn_periodic_chkhost, &d);
/* Enqueue everything we have requested */
nat64lsn_enqueue_jobs(cfg, &d.jhead, d.jlen);
callout_schedule(&cfg->periodic, hz * PERIODIC_DELAY);
IPFW_RUNLOCK(ch);
CURVNET_RESTORE();
}
static NAT64NOINLINE void
reinject_mbuf(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji)
{
if (ji->m == NULL)
return;
/* Request has failed or packet type is wrong */
if (ji->f_id.addr_type != 6 || ji->done == 0) {
m_freem(ji->m);
ji->m = NULL;
NAT64STAT_INC(&cfg->base.stats, dropped);
DPRINTF(DP_DROPS, "mbuf dropped: type %d, done %d",
ji->jtype, ji->done);
return;
}
/*
* XXX: Limit recursion level
*/
NAT64STAT_INC(&cfg->base.stats, jreinjected);
DPRINTF(DP_JQUEUE, "Reinject mbuf");
nat64lsn_translate6(cfg, &ji->f_id, &ji->m);
}
static void
destroy_portgroup(struct nat64lsn_portgroup *pg)
{
DPRINTF(DP_OBJ, "DESTROY PORTGROUP %d %p", pg->idx, pg);
uma_zfree(nat64lsn_pg_zone, pg);
}
static NAT64NOINLINE int
alloc_portgroup(struct nat64lsn_job_item *ji)
{
struct nat64lsn_portgroup *pg;
pg = uma_zalloc(nat64lsn_pg_zone, M_NOWAIT);
if (pg == NULL)
return (1);
if (ji->needs_idx != 0) {
ji->spare_idx = uma_zalloc(nat64lsn_pgidx_zone, M_NOWAIT);
/* Failed alloc isn't always fatal, so don't check */
}
memset(&pg->freemask, 0xFF, sizeof(pg->freemask));
pg->nat_proto = ji->nat_proto;
ji->pg = pg;
return (0);
}
static void
destroy_host6(struct nat64lsn_host *nh)
{
char a[INET6_ADDRSTRLEN];
int i;
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_OBJ, "DESTROY HOST %s %p (pg used %d)", a, nh,
nh->pg_used);
NAT64_LOCK_DESTROY(nh);
for (i = 0; i < nh->pg_allocated / NAT64LSN_PGIDX_CHUNK; i++)
uma_zfree(nat64lsn_pgidx_zone, PORTGROUP_CHUNK(nh, i));
uma_zfree(nat64lsn_host_zone, nh);
}
static NAT64NOINLINE int
alloc_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji)
{
struct nat64lsn_host *nh;
char a[INET6_ADDRSTRLEN];
nh = uma_zalloc(nat64lsn_host_zone, M_NOWAIT);
if (nh == NULL)
return (1);
PORTGROUP_CHUNK(nh, 0) = uma_zalloc(nat64lsn_pgidx_zone, M_NOWAIT);
if (PORTGROUP_CHUNK(nh, 0) == NULL) {
uma_zfree(nat64lsn_host_zone, nh);
return (2);
}
if (alloc_portgroup(ji) != 0) {
NAT64STAT_INC(&cfg->base.stats, jportfails);
uma_zfree(nat64lsn_pgidx_zone, PORTGROUP_CHUNK(nh, 0));
uma_zfree(nat64lsn_host_zone, nh);
return (3);
}
NAT64_LOCK_INIT(nh);
nh->addr = ji->haddr;
nh->hsize = NAT64LSN_HSIZE; /* XXX: hardcoded size */
nh->pg_allocated = NAT64LSN_PGIDX_CHUNK;
nh->pg_used = 0;
ji->nh = nh;
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_OBJ, "ALLOC HOST %s %p", a, ji->nh);
return (0);
}
/*
* Finds free @pg index inside @nh
*/
static NAT64NOINLINE int
find_nh_pg_idx(struct nat64lsn_cfg *cfg, struct nat64lsn_host *nh, int *idx)
{
int i;
for (i = 0; i < nh->pg_allocated; i++) {
if (PORTGROUP_BYSIDX(cfg, nh, i + 1) == NULL) {
*idx = i;
return (0);
}
}
return (1);
}
static NAT64NOINLINE int
attach_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji)
{
char a[INET6_ADDRSTRLEN];
struct nat64lsn_host *nh;
I6HASH_FIND(cfg, nh, &ji->haddr);
if (nh == NULL) {
/* Add new host to list */
nh = ji->nh;
I6HASH_INSERT(cfg, nh);
cfg->ihcount++;
ji->nh = NULL;
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_OBJ, "ATTACH HOST %s %p", a, nh);
/*
* Try to add portgroup.
* Note it will automatically set
* 'done' on ji if successful.
*/
if (attach_portgroup(cfg, ji) != 0) {
DPRINTF(DP_DROPS, "%s %p failed to attach PG",
a, nh);
NAT64STAT_INC(&cfg->base.stats, jportfails);
return (1);
}
return (0);
}
/*
* nh isn't NULL. This probably means we had several simultaneous
* host requests. The previous one request has already attached
* this host. Requeue attached mbuf and mark job as done, but
* leave nh and pg pointers not changed, so nat64lsn_do_request()
* will release all allocated resources.
*/
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_OBJ, "%s %p is already attached as %p",
a, ji->nh, nh);
ji->done = 1;
return (0);
}
static NAT64NOINLINE int
find_pg_place_addr(const struct nat64lsn_cfg *cfg, int addr_off,
int nat_proto, uint16_t *aport, int *ppg_idx)
{
int j, pg_idx;
pg_idx = addr_off * _ADDR_PG_COUNT +
(nat_proto - 1) * _ADDR_PG_PROTO_COUNT;
for (j = NAT64_MIN_CHUNK; j < _ADDR_PG_PROTO_COUNT; j++) {
if (cfg->pg[pg_idx + j] != NULL)
continue;
*aport = j * NAT64_CHUNK_SIZE;
*ppg_idx = pg_idx + j;
return (1);
}
return (0);
}
/*
* XXX: This function needs to be rewritten to
* use free bitmask for faster pg finding,
* additionally, it should take into consideration
* a) randomization and
* b) previous addresses allocated to given nat instance
*
*/
static NAT64NOINLINE int
find_portgroup_place(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji,
uint32_t *aaddr, uint16_t *aport, int *ppg_idx)
{
int i, nat_proto;
/*
* XXX: Use bitmask index to be able to find/check if IP address
* has some spare pg's
*/
nat_proto = ji->nat_proto;
/* First, try to use same address */
if (ji->aaddr != 0) {
i = ntohl(ji->aaddr) - cfg->prefix4;
if (find_pg_place_addr(cfg, i, nat_proto, aport,
ppg_idx) != 0){
/* Found! */
*aaddr = htonl(cfg->prefix4 + i);
return (0);
}
}
/* Next, try to use random address based on flow hash */
i = ji->fhash % (1 << (32 - cfg->plen4));
if (find_pg_place_addr(cfg, i, nat_proto, aport, ppg_idx) != 0) {
/* Found! */
*aaddr = htonl(cfg->prefix4 + i);
return (0);
}
/* Last one: simply find ANY available */
for (i = 0; i < (1 << (32 - cfg->plen4)); i++) {
if (find_pg_place_addr(cfg, i, nat_proto, aport,
ppg_idx) != 0){
/* Found! */
*aaddr = htonl(cfg->prefix4 + i);
return (0);
}
}
return (1);
}
static NAT64NOINLINE int
attach_portgroup(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji)
{
char a[INET6_ADDRSTRLEN];
struct nat64lsn_portgroup *pg;
struct nat64lsn_host *nh;
uint32_t aaddr;
uint16_t aport;
int nh_pg_idx, pg_idx;
pg = ji->pg;
/*
* Find source host and bind: we can't rely on
* pg->host
*/
I6HASH_FIND(cfg, nh, &ji->haddr);
if (nh == NULL)
return (1);
/* Find spare port chunk */
if (find_portgroup_place(cfg, ji, &aaddr, &aport, &pg_idx) != 0) {
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_OBJ | DP_DROPS, "empty PG not found for %s", a);
return (2);
}
/* Expand PG indexes if needed */
if (nh->pg_allocated < cfg->max_chunks && ji->spare_idx != NULL) {
PORTGROUP_CHUNK(nh, nh->pg_allocated / NAT64LSN_PGIDX_CHUNK) =
ji->spare_idx;
nh->pg_allocated += NAT64LSN_PGIDX_CHUNK;
ji->spare_idx = NULL;
}
/* Find empty index to store PG in the @nh */
if (find_nh_pg_idx(cfg, nh, &nh_pg_idx) != 0) {
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_OBJ | DP_DROPS, "free PG index not found for %s",
a);
return (3);
}
cfg->pg[pg_idx] = pg;
cfg->protochunks[pg->nat_proto]++;
NAT64STAT_INC(&cfg->base.stats, spgcreated);
pg->aaddr = aaddr;
pg->aport = aport;
pg->host = nh;
pg->idx = pg_idx;
SET_AGE(pg->timestamp);
PORTGROUP_BYSIDX(cfg, nh, nh_pg_idx + 1) = pg;
if (nh->pg_used == nh_pg_idx)
nh->pg_used++;
SET_AGE(nh->timestamp);
ji->pg = NULL;
ji->done = 1;
return (0);
}
static NAT64NOINLINE void
consider_del_portgroup(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji)
{
struct nat64lsn_host *nh, *nh_tmp;
struct nat64lsn_portgroup *pg, *pg_list[256];
int i, pg_lidx, idx;
/* Find source host */
I6HASH_FIND(cfg, nh, &ji->haddr);
if (nh == NULL || nh->pg_used == 0)
return;
memset(pg_list, 0, sizeof(pg_list));
pg_lidx = 0;
NAT64_LOCK(nh);
for (i = nh->pg_used - 1; i >= 0; i--) {
if ((ji->delmask[i / 64] & ((uint64_t)1 << (i % 64))) == 0)
continue;
pg = PORTGROUP_BYSIDX(cfg, nh, i + 1);
/* Check that PG isn't busy. */
if (stale_pg(cfg, pg) == 0)
continue;
/* DO delete */
pg_list[pg_lidx++] = pg;
PORTGROUP_BYSIDX(cfg, nh, i + 1) = NULL;
idx = _GET_PORTGROUP_IDX(cfg, ntohl(pg->aaddr), pg->nat_proto,
pg->aport);
KASSERT(cfg->pg[idx] == pg, ("Non matched pg"));
cfg->pg[idx] = NULL;
cfg->protochunks[pg->nat_proto]--;
NAT64STAT_INC(&cfg->base.stats, spgdeleted);
/* Decrease pg_used */
while (nh->pg_used > 0 &&
PORTGROUP_BYSIDX(cfg, nh, nh->pg_used) == NULL)
nh->pg_used--;
/* Check if on-stack buffer has ended */
if (pg_lidx == nitems(pg_list))
break;
}
NAT64_UNLOCK(nh);
if (stale_nh(cfg, nh)) {
I6HASH_REMOVE(cfg, nh, nh_tmp, &ji->haddr);
KASSERT(nh != NULL, ("Unable to find address"));
cfg->ihcount--;
ji->nh = nh;
I6HASH_FIND(cfg, nh, &ji->haddr);
KASSERT(nh == NULL, ("Failed to delete address"));
}
/* TODO: Delay freeing portgroups */
while (pg_lidx > 0) {
pg_lidx--;
NAT64STAT_INC(&cfg->base.stats, spgdeleted);
destroy_portgroup(pg_list[pg_lidx]);
}
}
/*
* Main request handler.
* Responsible for handling jqueue, e.g.
* creating new hosts, addind/deleting portgroups.
*/
static NAT64NOINLINE void
nat64lsn_do_request(void *data)
{
IPFW_RLOCK_TRACKER;
struct nat64lsn_job_head jhead;
struct nat64lsn_job_item *ji;
int jcount, nhsize;
struct nat64lsn_cfg *cfg = (struct nat64lsn_cfg *) data;
struct ip_fw_chain *ch;
int delcount;
CURVNET_SET(cfg->vp);
TAILQ_INIT(&jhead);
/* XXX: We're running unlocked here */
ch = cfg->ch;
delcount = 0;
IPFW_RLOCK(ch);
/* Grab queue */
JQUEUE_LOCK();
TAILQ_SWAP(&jhead, &cfg->jhead, nat64lsn_job_item, next);
jcount = cfg->jlen;
cfg->jlen = 0;
JQUEUE_UNLOCK();
/* check if we need to resize hash */
nhsize = 0;
if (cfg->ihcount > cfg->ihsize && cfg->ihsize < 65536) {
nhsize = cfg->ihsize;
for ( ; cfg->ihcount > nhsize && nhsize < 65536; nhsize *= 2)
;
} else if (cfg->ihcount < cfg->ihsize * 4) {
nhsize = cfg->ihsize;
for ( ; cfg->ihcount < nhsize * 4 && nhsize > 32; nhsize /= 2)
;
}
IPFW_RUNLOCK(ch);
if (TAILQ_EMPTY(&jhead)) {
CURVNET_RESTORE();
return;
}
NAT64STAT_INC(&cfg->base.stats, jcalls);
DPRINTF(DP_JQUEUE, "count=%d", jcount);
/*
* TODO:
* What we should do here is to build a hash
* to ensure we don't have lots of duplicate requests.
* Skip this for now.
*
* TODO: Limit per-call number of items
*/
/* Pre-allocate everything for entire chain */
TAILQ_FOREACH(ji, &jhead, next) {
switch (ji->jtype) {
case JTYPE_NEWHOST:
if (alloc_host6(cfg, ji) != 0)
NAT64STAT_INC(&cfg->base.stats,
jhostfails);
break;
case JTYPE_NEWPORTGROUP:
if (alloc_portgroup(ji) != 0)
NAT64STAT_INC(&cfg->base.stats,
jportfails);
break;
case JTYPE_DELPORTGROUP:
delcount += ji->delcount;
break;
default:
break;
}
}
/*
* TODO: Alloc hew hash
*/
nhsize = 0;
if (nhsize > 0) {
/* XXX: */
}
/* Apply all changes in batch */
IPFW_UH_WLOCK(ch);
IPFW_WLOCK(ch);
TAILQ_FOREACH(ji, &jhead, next) {
switch (ji->jtype) {
case JTYPE_NEWHOST:
if (ji->nh != NULL)
attach_host6(cfg, ji);
break;
case JTYPE_NEWPORTGROUP:
if (ji->pg != NULL &&
attach_portgroup(cfg, ji) != 0)
NAT64STAT_INC(&cfg->base.stats,
jportfails);
break;
case JTYPE_DELPORTGROUP:
consider_del_portgroup(cfg, ji);
break;
}
}
if (nhsize > 0) {
/* XXX: Move everything to new hash */
}
IPFW_WUNLOCK(ch);
IPFW_UH_WUNLOCK(ch);
/* Flush unused entries */
while (!TAILQ_EMPTY(&jhead)) {
ji = TAILQ_FIRST(&jhead);
TAILQ_REMOVE(&jhead, ji, next);
if (ji->nh != NULL)
destroy_host6(ji->nh);
if (ji->pg != NULL)
destroy_portgroup(ji->pg);
if (ji->m != NULL)
reinject_mbuf(cfg, ji);
if (ji->spare_idx != NULL)
uma_zfree(nat64lsn_pgidx_zone, ji->spare_idx);
free(ji, M_IPFW);
}
CURVNET_RESTORE();
}
static NAT64NOINLINE struct nat64lsn_job_item *
nat64lsn_create_job(struct nat64lsn_cfg *cfg, const struct ipfw_flow_id *f_id,
int jtype)
{
struct nat64lsn_job_item *ji;
struct in6_addr haddr;
uint8_t nat_proto;
/*
* Do not try to lock possibly contested mutex if we're near the limit.
* Drop packet instead.
*/
if (cfg->jlen >= cfg->jmaxlen) {
NAT64STAT_INC(&cfg->base.stats, jmaxlen);
return (NULL);
}
memset(&haddr, 0, sizeof(haddr));
nat_proto = 0;
if (f_id != NULL) {
haddr = f_id->src_ip6;
nat_proto = nat64lsn_proto_map[f_id->proto];
DPRINTF(DP_JQUEUE, "REQUEST pg nat_proto %d on proto %d",
nat_proto, f_id->proto);
if (nat_proto == 0)
return (NULL);
}
ji = malloc(sizeof(struct nat64lsn_job_item), M_IPFW,
M_NOWAIT | M_ZERO);
if (ji == NULL) {
NAT64STAT_INC(&cfg->base.stats, jnomem);
return (NULL);
}
ji->jtype = jtype;
if (f_id != NULL) {
ji->f_id = *f_id;
ji->haddr = haddr;
ji->nat_proto = nat_proto;
}
return (ji);
}
static NAT64NOINLINE void
nat64lsn_enqueue_job(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji)
{
if (ji == NULL)
return;
JQUEUE_LOCK();
TAILQ_INSERT_TAIL(&cfg->jhead, ji, next);
cfg->jlen++;
NAT64STAT_INC(&cfg->base.stats, jrequests);
if (callout_pending(&cfg->jcallout) == 0)
callout_reset(&cfg->jcallout, 1, nat64lsn_do_request, cfg);
JQUEUE_UNLOCK();
}
static NAT64NOINLINE void
nat64lsn_enqueue_jobs(struct nat64lsn_cfg *cfg,
struct nat64lsn_job_head *jhead, int jlen)
{
if (TAILQ_EMPTY(jhead))
return;
/* Attach current queue to execution one */
JQUEUE_LOCK();
TAILQ_CONCAT(&cfg->jhead, jhead, next);
cfg->jlen += jlen;
NAT64STAT_ADD(&cfg->base.stats, jrequests, jlen);
if (callout_pending(&cfg->jcallout) == 0)
callout_reset(&cfg->jcallout, 1, nat64lsn_do_request, cfg);
JQUEUE_UNLOCK();
}
static unsigned int
flow6_hash(const struct ipfw_flow_id *f_id)
{
unsigned char hbuf[36];
memcpy(hbuf, &f_id->dst_ip6, 16);
memcpy(&hbuf[16], &f_id->src_ip6, 16);
memcpy(&hbuf[32], &f_id->dst_port, 2);
memcpy(&hbuf[32], &f_id->src_port, 2);
return (djb_hash(hbuf, sizeof(hbuf)));
}
static NAT64NOINLINE int
nat64lsn_request_host(struct nat64lsn_cfg *cfg,
const struct ipfw_flow_id *f_id, struct mbuf **pm)
{
struct nat64lsn_job_item *ji;
struct mbuf *m;
m = *pm;
*pm = NULL;
ji = nat64lsn_create_job(cfg, f_id, JTYPE_NEWHOST);
if (ji == NULL) {
m_freem(m);
NAT64STAT_INC(&cfg->base.stats, dropped);
DPRINTF(DP_DROPS, "failed to create job");
} else {
ji->m = m;
/* Provide pseudo-random value based on flow */
ji->fhash = flow6_hash(f_id);
nat64lsn_enqueue_job(cfg, ji);
NAT64STAT_INC(&cfg->base.stats, jhostsreq);
}
return (IP_FW_DENY);
}
static NAT64NOINLINE int
nat64lsn_request_portgroup(struct nat64lsn_cfg *cfg,
const struct ipfw_flow_id *f_id, struct mbuf **pm, uint32_t aaddr,
int needs_idx)
{
struct nat64lsn_job_item *ji;
struct mbuf *m;
m = *pm;
*pm = NULL;
ji = nat64lsn_create_job(cfg, f_id, JTYPE_NEWPORTGROUP);
if (ji == NULL) {
m_freem(m);
NAT64STAT_INC(&cfg->base.stats, dropped);
DPRINTF(DP_DROPS, "failed to create job");
} else {
ji->m = m;
/* Provide pseudo-random value based on flow */
ji->fhash = flow6_hash(f_id);
ji->aaddr = aaddr;
ji->needs_idx = needs_idx;
nat64lsn_enqueue_job(cfg, ji);
NAT64STAT_INC(&cfg->base.stats, jportreq);
}
return (IP_FW_DENY);
}
static NAT64NOINLINE struct nat64lsn_state *
nat64lsn_create_state(struct nat64lsn_cfg *cfg, struct nat64lsn_host *nh,
int nat_proto, struct nat64lsn_state *kst, uint32_t *aaddr)
{
struct nat64lsn_portgroup *pg;
struct nat64lsn_state *st;
int i, hval, off;
/* XXX: create additional bitmask for selecting proper portgroup */
for (i = 0; i < nh->pg_used; i++) {
pg = PORTGROUP_BYSIDX(cfg, nh, i + 1);
if (pg == NULL)
continue;
if (*aaddr == 0)
*aaddr = pg->aaddr;
if (pg->nat_proto != nat_proto)
continue;
off = PG_GET_FREE_IDX(pg);
if (off != 0) {
/* We have found spare state. Use it */
off--;
PG_MARK_BUSY_IDX(pg, off);
st = &pg->states[off];
/*
* Fill in new info. Assume state was zeroed.
* Timestamp and flags will be filled by caller.
*/
st->u.s = kst->u.s;
st->cur.idx = i + 1;
st->cur.off = off;
/* Insert into host hash table */
hval = HASH_IN4(&st->u.hkey) & (nh->hsize - 1);
st->next = nh->phash[hval];
nh->phash[hval] = st->cur;
nat64lsn_dump_state(cfg, pg, st, "ALLOC STATE", off);
NAT64STAT_INC(&cfg->base.stats, screated);
return (st);
}
/* Saev last used alias affress */
*aaddr = pg->aaddr;
}
return (NULL);
}
static NAT64NOINLINE int
nat64lsn_translate6(struct nat64lsn_cfg *cfg, struct ipfw_flow_id *f_id,
struct mbuf **pm)
{
struct pfloghdr loghdr, *logdata;
char a[INET6_ADDRSTRLEN];
struct nat64lsn_host *nh;
struct st_ptr sidx;
struct nat64lsn_state *st, kst;
struct nat64lsn_portgroup *pg;
struct icmp6_hdr *icmp6;
uint32_t aaddr;
int action, hval, nat_proto, proto;
uint16_t aport, state_ts, state_flags;
/* Check if af/protocol is supported and get it short id */
nat_proto = nat64lsn_proto_map[f_id->proto];
if (nat_proto == 0) {
/*
* Since we can be called from jobs handler, we need
* to free mbuf by self, do not leave this task to
* ipfw_check_packet().
*/
NAT64STAT_INC(&cfg->base.stats, noproto);
goto drop;
}
/* Try to find host first */
I6HASH_FIND(cfg, nh, &f_id->src_ip6);
if (nh == NULL)
return (nat64lsn_request_host(cfg, f_id, pm));
/* Fill-in on-stack state structure */
kst.u.s.faddr = nat64_extract_ip4(&cfg->base, &f_id->dst_ip6);
if (kst.u.s.faddr == 0) {
NAT64STAT_INC(&cfg->base.stats, dropped);
goto drop;
}
kst.u.s.fport = f_id->dst_port;
kst.u.s.lport = f_id->src_port;
/* Prepare some fields we might need to update */
hval = 0;
proto = nat64_getlasthdr(*pm, &hval);
if (proto < 0) {
NAT64STAT_INC(&cfg->base.stats, dropped);
DPRINTF(DP_DROPS, "dropped due to mbuf isn't contigious");
goto drop;
}
SET_AGE(state_ts);
if (proto == IPPROTO_TCP)
state_flags = convert_tcp_flags(
TCP(mtodo(*pm, hval))->th_flags);
else
state_flags = 0;
if (proto == IPPROTO_ICMPV6) {
/* Alter local port data */
icmp6 = mtodo(*pm, hval);
if (icmp6->icmp6_type == ICMP6_ECHO_REQUEST ||
icmp6->icmp6_type == ICMP6_ECHO_REPLY)
kst.u.s.lport = ntohs(icmp6->icmp6_id);
}
hval = HASH_IN4(&kst.u.hkey) & (nh->hsize - 1);
pg = NULL;
st = NULL;
/* OK, let's find state in host hash */
NAT64_LOCK(nh);
sidx = nh->phash[hval];
int k = 0;
while (sidx.idx != 0) {
pg = PORTGROUP_BYSIDX(cfg, nh, sidx.idx);
st = &pg->states[sidx.off];
//DPRINTF("SISX: %d/%d next: %d/%d", sidx.idx, sidx.off,
//st->next.idx, st->next.off);
if (st->u.hkey == kst.u.hkey && pg->nat_proto == nat_proto)
break;
if (k++ > 1000) {
DPRINTF(DP_ALL, "XXX: too long %d/%d %d/%d\n",
sidx.idx, sidx.off, st->next.idx, st->next.off);
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_GENERIC, "TR host %s %p on cpu %d",
a, nh, curcpu);
k = 0;
}
sidx = st->next;
}
if (sidx.idx == 0) {
aaddr = 0;
st = nat64lsn_create_state(cfg, nh, nat_proto, &kst, &aaddr);
if (st == NULL) {
/* No free states. Request more if we can */
if (nh->pg_used >= cfg->max_chunks) {
/* Limit reached */
inet_ntop(AF_INET6, &nh->addr, a, sizeof(a));
DPRINTF(DP_DROPS, "PG limit reached "
" for host %s (used %u, allocated %u, "
"limit %u)", a,
nh->pg_used * NAT64_CHUNK_SIZE,
nh->pg_allocated * NAT64_CHUNK_SIZE,
cfg->max_chunks * NAT64_CHUNK_SIZE);
NAT64_UNLOCK(nh);
NAT64STAT_INC(&cfg->base.stats, dropped);
goto drop;
}
if ((nh->pg_allocated <=
nh->pg_used + NAT64LSN_REMAININGPG) &&
nh->pg_allocated < cfg->max_chunks)
action = 1; /* Request new indexes */
else
action = 0;
NAT64_UNLOCK(nh);
//DPRINTF("No state, unlock for %p", nh);
return (nat64lsn_request_portgroup(cfg, f_id,
pm, aaddr, action));
}
/* We've got new state. */
sidx = st->cur;
pg = PORTGROUP_BYSIDX(cfg, nh, sidx.idx);
}
/* Okay, state found */
/* Update necessary fileds */
if (st->timestamp != state_ts)
st->timestamp = state_ts;
if ((st->flags & state_flags) != 0)
st->flags |= state_flags;
/* Copy needed state data */
aaddr = pg->aaddr;
aport = htons(pg->aport + sidx.off);
NAT64_UNLOCK(nh);
if (cfg->base.flags & NAT64_LOG) {
logdata = &loghdr;
nat64lsn_log(logdata, *pm, AF_INET6, pg->idx, st->cur.off);
} else
logdata = NULL;
action = nat64_do_handle_ip6(*pm, aaddr, aport, &cfg->base, logdata);
if (action == NAT64SKIP)
return (cfg->nomatch_verdict);
if (action == NAT64MFREE) {
drop:
m_freem(*pm);
}
*pm = NULL; /* mark mbuf as consumed */
return (IP_FW_DENY);
}
/*
* Main dataplane entry point.
*/
int
ipfw_nat64lsn(struct ip_fw_chain *ch, struct ip_fw_args *args,
ipfw_insn *cmd, int *done)
{
ipfw_insn *icmd;
struct nat64lsn_cfg *cfg;
int ret;
IPFW_RLOCK_ASSERT(ch);
*done = 1; /* terminate the search */
icmd = cmd + 1;
if (cmd->opcode != O_EXTERNAL_ACTION ||
cmd->arg1 != V_nat64lsn_eid ||
icmd->opcode != O_EXTERNAL_INSTANCE ||
(cfg = NAT64_LOOKUP(ch, icmd)) == NULL)
return (0);
switch (args->f_id.addr_type) {
case 4:
ret = nat64lsn_translate4(cfg, &args->f_id, &args->m);
break;
case 6:
ret = nat64lsn_translate6(cfg, &args->f_id, &args->m);
break;
default:
return (cfg->nomatch_verdict);
}
return (ret);
}
static int
nat64lsn_ctor_host(void *mem, int size, void *arg, int flags)
{
struct nat64lsn_host *nh;
nh = (struct nat64lsn_host *)mem;
memset(nh->pg_ptr, 0, sizeof(nh->pg_ptr));
memset(nh->phash, 0, sizeof(nh->phash));
return (0);
}
static int
nat64lsn_ctor_pgidx(void *mem, int size, void *arg, int flags)
{
memset(mem, 0, size);
return (0);
}
void
nat64lsn_init_internal(void)
{
memset(nat64lsn_proto_map, 0, sizeof(nat64lsn_proto_map));
/* Set up supported protocol map */
nat64lsn_proto_map[IPPROTO_TCP] = NAT_PROTO_TCP;
nat64lsn_proto_map[IPPROTO_UDP] = NAT_PROTO_UDP;
nat64lsn_proto_map[IPPROTO_ICMP] = NAT_PROTO_ICMP;
nat64lsn_proto_map[IPPROTO_ICMPV6] = NAT_PROTO_ICMP;
/* Fill in reverse proto map */
memset(nat64lsn_rproto_map, 0, sizeof(nat64lsn_rproto_map));
nat64lsn_rproto_map[NAT_PROTO_TCP] = IPPROTO_TCP;
nat64lsn_rproto_map[NAT_PROTO_UDP] = IPPROTO_UDP;
nat64lsn_rproto_map[NAT_PROTO_ICMP] = IPPROTO_ICMPV6;
JQUEUE_LOCK_INIT();
nat64lsn_host_zone = uma_zcreate("NAT64 hosts zone",
sizeof(struct nat64lsn_host), nat64lsn_ctor_host, NULL,
NULL, NULL, UMA_ALIGN_PTR, 0);
nat64lsn_pg_zone = uma_zcreate("NAT64 portgroups zone",
sizeof(struct nat64lsn_portgroup), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
nat64lsn_pgidx_zone = uma_zcreate("NAT64 portgroup indexes zone",
sizeof(struct nat64lsn_portgroup *) * NAT64LSN_PGIDX_CHUNK,
nat64lsn_ctor_pgidx, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
}
void
nat64lsn_uninit_internal(void)
{
JQUEUE_LOCK_DESTROY();
uma_zdestroy(nat64lsn_host_zone);
uma_zdestroy(nat64lsn_pg_zone);
uma_zdestroy(nat64lsn_pgidx_zone);
}
void
nat64lsn_start_instance(struct nat64lsn_cfg *cfg)
{
callout_reset(&cfg->periodic, hz * PERIODIC_DELAY,
nat64lsn_periodic, cfg);
}
struct nat64lsn_cfg *
nat64lsn_init_instance(struct ip_fw_chain *ch, size_t numaddr)
{
struct nat64lsn_cfg *cfg;
cfg = malloc(sizeof(struct nat64lsn_cfg), M_IPFW, M_WAITOK | M_ZERO);
TAILQ_INIT(&cfg->jhead);
cfg->vp = curvnet;
cfg->ch = ch;
COUNTER_ARRAY_ALLOC(cfg->base.stats.cnt, NAT64STATS, M_WAITOK);
cfg->ihsize = NAT64LSN_HSIZE;
cfg->ih = malloc(sizeof(void *) * cfg->ihsize, M_IPFW,
M_WAITOK | M_ZERO);
cfg->pg = malloc(sizeof(void *) * numaddr * _ADDR_PG_COUNT, M_IPFW,
M_WAITOK | M_ZERO);
callout_init(&cfg->periodic, CALLOUT_MPSAFE);
callout_init(&cfg->jcallout, CALLOUT_MPSAFE);
return (cfg);
}
/*
* Destroy all hosts callback.
* Called on module unload when all activity already finished, so
* can work without any locks.
*/
static NAT64NOINLINE int
nat64lsn_destroy_host(struct nat64lsn_host *nh, struct nat64lsn_cfg *cfg)
{
struct nat64lsn_portgroup *pg;
int i;
for (i = nh->pg_used; i > 0; i--) {
pg = PORTGROUP_BYSIDX(cfg, nh, i);
if (pg == NULL)
continue;
cfg->pg[pg->idx] = NULL;
destroy_portgroup(pg);
nh->pg_used--;
}
destroy_host6(nh);
cfg->ihcount--;
return (0);
}
void
nat64lsn_destroy_instance(struct nat64lsn_cfg *cfg)
{
struct nat64lsn_host *nh, *tmp;
callout_drain(&cfg->jcallout);
callout_drain(&cfg->periodic);
I6HASH_FOREACH_SAFE(cfg, nh, tmp, nat64lsn_destroy_host, cfg);
DPRINTF(DP_OBJ, "instance %s: hosts %d", cfg->name, cfg->ihcount);
COUNTER_ARRAY_FREE(cfg->base.stats.cnt, NAT64STATS);
free(cfg->ih, M_IPFW);
free(cfg->pg, M_IPFW);
free(cfg, M_IPFW);
}
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