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|
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2015-2019 Yandex LLC
* Copyright (c) 2015 Alexander V. Chernikov <melifaro@FreeBSD.org>
* Copyright (c) 2015-2019 Andrey V. Elsukov <ae@FreeBSD.org>
*
* 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/sockopt.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/pfil.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/ip_var.h>
#include <netinet/ip_fw.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 "nat64stl.h"
VNET_DEFINE(uint16_t, nat64stl_eid) = 0;
static struct nat64stl_cfg *nat64stl_alloc_config(const char *name,
uint8_t set);
static void nat64stl_free_config(struct nat64stl_cfg *cfg);
static struct nat64stl_cfg *nat64stl_find(struct namedobj_instance *ni,
const char *name, uint8_t set);
static struct nat64stl_cfg *
nat64stl_alloc_config(const char *name, uint8_t set)
{
struct nat64stl_cfg *cfg;
cfg = malloc(sizeof(struct nat64stl_cfg), M_IPFW, M_WAITOK | M_ZERO);
COUNTER_ARRAY_ALLOC(cfg->base.stats.cnt, NAT64STATS, M_WAITOK);
cfg->no.name = cfg->name;
cfg->no.etlv = IPFW_TLV_NAT64STL_NAME;
cfg->no.set = set;
strlcpy(cfg->name, name, sizeof(cfg->name));
return (cfg);
}
static void
nat64stl_free_config(struct nat64stl_cfg *cfg)
{
COUNTER_ARRAY_FREE(cfg->base.stats.cnt, NAT64STATS);
free(cfg, M_IPFW);
}
static void
nat64stl_export_config(struct ip_fw_chain *ch, struct nat64stl_cfg *cfg,
ipfw_nat64stl_cfg *uc)
{
struct named_object *no;
uc->prefix6 = cfg->base.plat_prefix;
uc->plen6 = cfg->base.plat_plen;
uc->flags = cfg->base.flags & NAT64STL_FLAGSMASK;
uc->set = cfg->no.set;
strlcpy(uc->name, cfg->no.name, sizeof(uc->name));
no = ipfw_objhash_lookup_table_kidx(ch, cfg->map64);
ipfw_export_obj_ntlv(no, &uc->ntlv6);
no = ipfw_objhash_lookup_table_kidx(ch, cfg->map46);
ipfw_export_obj_ntlv(no, &uc->ntlv4);
}
struct nat64stl_dump_arg {
struct ip_fw_chain *ch;
struct sockopt_data *sd;
};
static int
export_config_cb(struct namedobj_instance *ni, struct named_object *no,
void *arg)
{
struct nat64stl_dump_arg *da = (struct nat64stl_dump_arg *)arg;
ipfw_nat64stl_cfg *uc;
uc = (ipfw_nat64stl_cfg *)ipfw_get_sopt_space(da->sd, sizeof(*uc));
nat64stl_export_config(da->ch, (struct nat64stl_cfg *)no, uc);
return (0);
}
static struct nat64stl_cfg *
nat64stl_find(struct namedobj_instance *ni, const char *name, uint8_t set)
{
struct nat64stl_cfg *cfg;
cfg = (struct nat64stl_cfg *)ipfw_objhash_lookup_name_type(ni, set,
IPFW_TLV_NAT64STL_NAME, name);
return (cfg);
}
static int
nat64stl_create_internal(struct ip_fw_chain *ch, struct nat64stl_cfg *cfg,
ipfw_nat64stl_cfg *i)
{
IPFW_UH_WLOCK_ASSERT(ch);
if (ipfw_objhash_alloc_idx(CHAIN_TO_SRV(ch), &cfg->no.kidx) != 0)
return (ENOSPC);
cfg->base.flags |= NAT64STL_KIDX;
if (ipfw_ref_table(ch, &i->ntlv4, &cfg->map46) != 0)
return (EINVAL);
cfg->base.flags |= NAT64STL_46T;
if (ipfw_ref_table(ch, &i->ntlv6, &cfg->map64) != 0)
return (EINVAL);
cfg->base.flags |= NAT64STL_64T;
ipfw_objhash_add(CHAIN_TO_SRV(ch), &cfg->no);
return (0);
}
/*
* Creates new nat64 instance.
* Data layout (v0)(current):
* Request: [ ipfw_obj_lheader ipfw_nat64stl_cfg ]
*
* Returns 0 on success
*/
static int
nat64stl_create(struct ip_fw_chain *ch, ip_fw3_opheader *op3,
struct sockopt_data *sd)
{
ipfw_obj_lheader *olh;
ipfw_nat64stl_cfg *uc;
struct namedobj_instance *ni;
struct nat64stl_cfg *cfg;
int error;
if (sd->valsize != sizeof(*olh) + sizeof(*uc))
return (EINVAL);
olh = (ipfw_obj_lheader *)sd->kbuf;
uc = (ipfw_nat64stl_cfg *)(olh + 1);
if (ipfw_check_object_name_generic(uc->name) != 0)
return (EINVAL);
if (uc->set >= IPFW_MAX_SETS ||
nat64_check_prefix6(&uc->prefix6, uc->plen6) != 0)
return (EINVAL);
/* XXX: check types of tables */
ni = CHAIN_TO_SRV(ch);
error = 0;
IPFW_UH_RLOCK(ch);
if (nat64stl_find(ni, uc->name, uc->set) != NULL) {
IPFW_UH_RUNLOCK(ch);
return (EEXIST);
}
IPFW_UH_RUNLOCK(ch);
cfg = nat64stl_alloc_config(uc->name, uc->set);
cfg->base.plat_prefix = uc->prefix6;
cfg->base.plat_plen = uc->plen6;
cfg->base.flags = (uc->flags & NAT64STL_FLAGSMASK) | NAT64_PLATPFX;
if (IN6_IS_ADDR_WKPFX(&cfg->base.plat_prefix))
cfg->base.flags |= NAT64_WKPFX;
IPFW_UH_WLOCK(ch);
if (nat64stl_find(ni, uc->name, uc->set) != NULL) {
IPFW_UH_WUNLOCK(ch);
nat64stl_free_config(cfg);
return (EEXIST);
}
error = nat64stl_create_internal(ch, cfg, uc);
if (error == 0) {
/* Okay, let's link data */
SRV_OBJECT(ch, cfg->no.kidx) = cfg;
IPFW_UH_WUNLOCK(ch);
return (0);
}
if (cfg->base.flags & NAT64STL_KIDX)
ipfw_objhash_free_idx(ni, cfg->no.kidx);
if (cfg->base.flags & NAT64STL_46T)
ipfw_unref_table(ch, cfg->map46);
if (cfg->base.flags & NAT64STL_64T)
ipfw_unref_table(ch, cfg->map64);
IPFW_UH_WUNLOCK(ch);
nat64stl_free_config(cfg);
return (error);
}
/*
* Change existing nat64stl instance configuration.
* Data layout (v0)(current):
* Request: [ ipfw_obj_header ipfw_nat64stl_cfg ]
* Reply: [ ipfw_obj_header ipfw_nat64stl_cfg ]
*
* Returns 0 on success
*/
static int
nat64stl_config(struct ip_fw_chain *ch, ip_fw3_opheader *op,
struct sockopt_data *sd)
{
ipfw_obj_header *oh;
ipfw_nat64stl_cfg *uc;
struct nat64stl_cfg *cfg;
struct namedobj_instance *ni;
if (sd->valsize != sizeof(*oh) + sizeof(*uc))
return (EINVAL);
oh = (ipfw_obj_header *)ipfw_get_sopt_space(sd,
sizeof(*oh) + sizeof(*uc));
uc = (ipfw_nat64stl_cfg *)(oh + 1);
if (ipfw_check_object_name_generic(oh->ntlv.name) != 0 ||
oh->ntlv.set >= IPFW_MAX_SETS)
return (EINVAL);
ni = CHAIN_TO_SRV(ch);
if (sd->sopt->sopt_dir == SOPT_GET) {
IPFW_UH_RLOCK(ch);
cfg = nat64stl_find(ni, oh->ntlv.name, oh->ntlv.set);
if (cfg == NULL) {
IPFW_UH_RUNLOCK(ch);
return (EEXIST);
}
nat64stl_export_config(ch, cfg, uc);
IPFW_UH_RUNLOCK(ch);
return (0);
}
IPFW_UH_WLOCK(ch);
cfg = nat64stl_find(ni, oh->ntlv.name, oh->ntlv.set);
if (cfg == NULL) {
IPFW_UH_WUNLOCK(ch);
return (EEXIST);
}
/*
* For now allow to change only following values:
* flags.
*/
cfg->base.flags &= ~NAT64STL_FLAGSMASK;
cfg->base.flags |= uc->flags & NAT64STL_FLAGSMASK;
IPFW_UH_WUNLOCK(ch);
return (0);
}
static void
nat64stl_detach_config(struct ip_fw_chain *ch, struct nat64stl_cfg *cfg)
{
IPFW_UH_WLOCK_ASSERT(ch);
ipfw_objhash_del(CHAIN_TO_SRV(ch), &cfg->no);
ipfw_objhash_free_idx(CHAIN_TO_SRV(ch), cfg->no.kidx);
ipfw_unref_table(ch, cfg->map46);
ipfw_unref_table(ch, cfg->map64);
}
/*
* Destroys nat64 instance.
* Data layout (v0)(current):
* Request: [ ipfw_obj_header ]
*
* Returns 0 on success
*/
static int
nat64stl_destroy(struct ip_fw_chain *ch, ip_fw3_opheader *op3,
struct sockopt_data *sd)
{
ipfw_obj_header *oh;
struct nat64stl_cfg *cfg;
if (sd->valsize != sizeof(*oh))
return (EINVAL);
oh = (ipfw_obj_header *)sd->kbuf;
if (ipfw_check_object_name_generic(oh->ntlv.name) != 0)
return (EINVAL);
IPFW_UH_WLOCK(ch);
cfg = nat64stl_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set);
if (cfg == NULL) {
IPFW_UH_WUNLOCK(ch);
return (ESRCH);
}
if (cfg->no.refcnt > 0) {
IPFW_UH_WUNLOCK(ch);
return (EBUSY);
}
ipfw_reset_eaction_instance(ch, V_nat64stl_eid, cfg->no.kidx);
SRV_OBJECT(ch, cfg->no.kidx) = NULL;
nat64stl_detach_config(ch, cfg);
IPFW_UH_WUNLOCK(ch);
nat64stl_free_config(cfg);
return (0);
}
/*
* Lists all nat64stl instances currently available in kernel.
* Data layout (v0)(current):
* Request: [ ipfw_obj_lheader ]
* Reply: [ ipfw_obj_lheader ipfw_nat64stl_cfg x N ]
*
* Returns 0 on success
*/
static int
nat64stl_list(struct ip_fw_chain *ch, ip_fw3_opheader *op3,
struct sockopt_data *sd)
{
ipfw_obj_lheader *olh;
struct nat64stl_dump_arg da;
/* Check minimum header size */
if (sd->valsize < sizeof(ipfw_obj_lheader))
return (EINVAL);
olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh));
IPFW_UH_RLOCK(ch);
olh->count = ipfw_objhash_count_type(CHAIN_TO_SRV(ch),
IPFW_TLV_NAT64STL_NAME);
olh->objsize = sizeof(ipfw_nat64stl_cfg);
olh->size = sizeof(*olh) + olh->count * olh->objsize;
if (sd->valsize < olh->size) {
IPFW_UH_RUNLOCK(ch);
return (ENOMEM);
}
memset(&da, 0, sizeof(da));
da.ch = ch;
da.sd = sd;
ipfw_objhash_foreach_type(CHAIN_TO_SRV(ch), export_config_cb,
&da, IPFW_TLV_NAT64STL_NAME);
IPFW_UH_RUNLOCK(ch);
return (0);
}
#define __COPY_STAT_FIELD(_cfg, _stats, _field) \
(_stats)->_field = NAT64STAT_FETCH(&(_cfg)->base.stats, _field)
static void
export_stats(struct ip_fw_chain *ch, struct nat64stl_cfg *cfg,
struct ipfw_nat64stl_stats *stats)
{
__COPY_STAT_FIELD(cfg, stats, opcnt64);
__COPY_STAT_FIELD(cfg, stats, opcnt46);
__COPY_STAT_FIELD(cfg, stats, ofrags);
__COPY_STAT_FIELD(cfg, stats, ifrags);
__COPY_STAT_FIELD(cfg, stats, oerrors);
__COPY_STAT_FIELD(cfg, stats, noroute4);
__COPY_STAT_FIELD(cfg, stats, noroute6);
__COPY_STAT_FIELD(cfg, stats, noproto);
__COPY_STAT_FIELD(cfg, stats, nomem);
__COPY_STAT_FIELD(cfg, stats, dropped);
}
/*
* Get nat64stl statistics.
* Data layout (v0)(current):
* Request: [ ipfw_obj_header ]
* Reply: [ ipfw_obj_header ipfw_obj_ctlv [ uint64_t x N ]]
*
* Returns 0 on success
*/
static int
nat64stl_stats(struct ip_fw_chain *ch, ip_fw3_opheader *op,
struct sockopt_data *sd)
{
struct ipfw_nat64stl_stats stats;
struct nat64stl_cfg *cfg;
ipfw_obj_header *oh;
ipfw_obj_ctlv *ctlv;
size_t sz;
sz = sizeof(ipfw_obj_header) + sizeof(ipfw_obj_ctlv) + sizeof(stats);
if (sd->valsize % sizeof(uint64_t))
return (EINVAL);
if (sd->valsize < sz)
return (ENOMEM);
oh = (ipfw_obj_header *)ipfw_get_sopt_header(sd, sz);
if (oh == NULL)
return (EINVAL);
memset(&stats, 0, sizeof(stats));
IPFW_UH_RLOCK(ch);
cfg = nat64stl_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set);
if (cfg == NULL) {
IPFW_UH_RUNLOCK(ch);
return (ESRCH);
}
export_stats(ch, cfg, &stats);
IPFW_UH_RUNLOCK(ch);
ctlv = (ipfw_obj_ctlv *)(oh + 1);
memset(ctlv, 0, sizeof(*ctlv));
ctlv->head.type = IPFW_TLV_COUNTERS;
ctlv->head.length = sz - sizeof(ipfw_obj_header);
ctlv->count = sizeof(stats) / sizeof(uint64_t);
ctlv->objsize = sizeof(uint64_t);
ctlv->version = IPFW_NAT64_VERSION;
memcpy(ctlv + 1, &stats, sizeof(stats));
return (0);
}
/*
* Reset nat64stl statistics.
* Data layout (v0)(current):
* Request: [ ipfw_obj_header ]
*
* Returns 0 on success
*/
static int
nat64stl_reset_stats(struct ip_fw_chain *ch, ip_fw3_opheader *op,
struct sockopt_data *sd)
{
struct nat64stl_cfg *cfg;
ipfw_obj_header *oh;
if (sd->valsize != sizeof(*oh))
return (EINVAL);
oh = (ipfw_obj_header *)sd->kbuf;
if (ipfw_check_object_name_generic(oh->ntlv.name) != 0 ||
oh->ntlv.set >= IPFW_MAX_SETS)
return (EINVAL);
IPFW_UH_WLOCK(ch);
cfg = nat64stl_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set);
if (cfg == NULL) {
IPFW_UH_WUNLOCK(ch);
return (ESRCH);
}
COUNTER_ARRAY_ZERO(cfg->base.stats.cnt, NAT64STATS);
IPFW_UH_WUNLOCK(ch);
return (0);
}
static struct ipfw_sopt_handler scodes[] = {
{ IP_FW_NAT64STL_CREATE, 0, HDIR_SET, nat64stl_create },
{ IP_FW_NAT64STL_DESTROY,0, HDIR_SET, nat64stl_destroy },
{ IP_FW_NAT64STL_CONFIG, 0, HDIR_BOTH, nat64stl_config },
{ IP_FW_NAT64STL_LIST, 0, HDIR_GET, nat64stl_list },
{ IP_FW_NAT64STL_STATS, 0, HDIR_GET, nat64stl_stats },
{ IP_FW_NAT64STL_RESET_STATS,0, HDIR_SET, nat64stl_reset_stats },
};
static int
nat64stl_classify(ipfw_insn *cmd, uint16_t *puidx, uint8_t *ptype)
{
ipfw_insn *icmd;
icmd = cmd - 1;
if (icmd->opcode != O_EXTERNAL_ACTION ||
icmd->arg1 != V_nat64stl_eid)
return (1);
*puidx = cmd->arg1;
*ptype = 0;
return (0);
}
static void
nat64stl_update_arg1(ipfw_insn *cmd, uint16_t idx)
{
cmd->arg1 = idx;
}
static int
nat64stl_findbyname(struct ip_fw_chain *ch, struct tid_info *ti,
struct named_object **pno)
{
int err;
err = ipfw_objhash_find_type(CHAIN_TO_SRV(ch), ti,
IPFW_TLV_NAT64STL_NAME, pno);
return (err);
}
static struct named_object *
nat64stl_findbykidx(struct ip_fw_chain *ch, uint16_t idx)
{
struct namedobj_instance *ni;
struct named_object *no;
IPFW_UH_WLOCK_ASSERT(ch);
ni = CHAIN_TO_SRV(ch);
no = ipfw_objhash_lookup_kidx(ni, idx);
KASSERT(no != NULL, ("NAT with index %d not found", idx));
return (no);
}
static int
nat64stl_manage_sets(struct ip_fw_chain *ch, uint16_t set, uint8_t new_set,
enum ipfw_sets_cmd cmd)
{
return (ipfw_obj_manage_sets(CHAIN_TO_SRV(ch), IPFW_TLV_NAT64STL_NAME,
set, new_set, cmd));
}
static struct opcode_obj_rewrite opcodes[] = {
{
.opcode = O_EXTERNAL_INSTANCE,
.etlv = IPFW_TLV_EACTION /* just show it isn't table */,
.classifier = nat64stl_classify,
.update = nat64stl_update_arg1,
.find_byname = nat64stl_findbyname,
.find_bykidx = nat64stl_findbykidx,
.manage_sets = nat64stl_manage_sets,
},
};
static int
destroy_config_cb(struct namedobj_instance *ni, struct named_object *no,
void *arg)
{
struct nat64stl_cfg *cfg;
struct ip_fw_chain *ch;
ch = (struct ip_fw_chain *)arg;
cfg = (struct nat64stl_cfg *)SRV_OBJECT(ch, no->kidx);
SRV_OBJECT(ch, no->kidx) = NULL;
nat64stl_detach_config(ch, cfg);
nat64stl_free_config(cfg);
return (0);
}
int
nat64stl_init(struct ip_fw_chain *ch, int first)
{
V_nat64stl_eid = ipfw_add_eaction(ch, ipfw_nat64stl, "nat64stl");
if (V_nat64stl_eid == 0)
return (ENXIO);
IPFW_ADD_SOPT_HANDLER(first, scodes);
IPFW_ADD_OBJ_REWRITER(first, opcodes);
return (0);
}
void
nat64stl_uninit(struct ip_fw_chain *ch, int last)
{
IPFW_DEL_OBJ_REWRITER(last, opcodes);
IPFW_DEL_SOPT_HANDLER(last, scodes);
ipfw_del_eaction(ch, V_nat64stl_eid);
/*
* Since we already have deregistered external action,
* our named objects become unaccessible via rules, because
* all rules were truncated by ipfw_del_eaction().
* So, we can unlink and destroy our named objects without holding
* IPFW_WLOCK().
*/
IPFW_UH_WLOCK(ch);
ipfw_objhash_foreach_type(CHAIN_TO_SRV(ch), destroy_config_cb, ch,
IPFW_TLV_NAT64STL_NAME);
V_nat64stl_eid = 0;
IPFW_UH_WUNLOCK(ch);
}
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