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sys/netpfil/ipfw/nat64/nat64stl_control.c
- This file was added.
/*- | |||||
* Copyright (c) 2015-2016 Yandex LLC | |||||
* Copyright (c) 2015-2016 Alexander V. Chernikov <melifaro@FreeBSD.org> | |||||
* Copyright (c) 2015-2016 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/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 <netpfil/ipfw/ip_fw_private.h> | |||||
#include <netpfil/ipfw/nat64/ip_fw_nat64.h> | |||||
#include <netpfil/ipfw/nat64/nat64stl.h> | |||||
#include <netinet6/ip_fw_nat64.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->stats.stats, 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->stats.stats, NAT64STATS); | |||||
free(cfg, M_IPFW); | |||||
} | |||||
static int | |||||
nat64stl_config(struct ip_fw_chain *chain, ip_fw3_opheader *op, | |||||
struct sockopt_data *sd) | |||||
{ | |||||
return (EOPNOTSUPP); | |||||
} | |||||
static void | |||||
nat64stl_export_config(struct ip_fw_chain *ch, struct nat64stl_cfg *cfg, | |||||
ipfw_nat64stl_cfg *uc) | |||||
{ | |||||
struct named_object *no; | |||||
uc->prefix = cfg->prefix; | |||||
uc->plen = cfg->plen; | |||||
uc->flags = cfg->flags & NAT64_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->flags |= NAT64_KIDX; | |||||
if (ipfw_ref_table(ch, &i->ntlv4, &cfg->map46) != 0) | |||||
return (EINVAL); | |||||
cfg->flags |= NAT64_46T; | |||||
if (ipfw_ref_table(ch, &i->ntlv6, &cfg->map64) != 0) | |||||
return (EINVAL); | |||||
cfg->flags |= NAT64_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 (!IN6_IS_ADDR_WKPFX(&uc->prefix)) | |||||
return (EINVAL); | |||||
if (uc->plen != 96 || uc->set >= IPFW_MAX_SETS) | |||||
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->prefix = uc->prefix; | |||||
cfg->plen = uc->plen; | |||||
cfg->flags = 0; | |||||
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 */ | |||||
IPFW_WLOCK(ch); | |||||
SRV_OBJECT(ch, cfg->no.kidx) = cfg; | |||||
IPFW_WUNLOCK(ch); | |||||
IPFW_UH_WUNLOCK(ch); | |||||
return (0); | |||||
} | |||||
if (cfg->flags & NAT64_KIDX) | |||||
ipfw_objhash_free_idx(ni, cfg->no.kidx); | |||||
if (cfg->flags & NAT64_46T) | |||||
ipfw_unref_table(ch, cfg->map46); | |||||
if (cfg->flags & NAT64_64T) | |||||
ipfw_unref_table(ch, cfg->map64); | |||||
IPFW_UH_WUNLOCK(ch); | |||||
nat64stl_free_config(cfg); | |||||
return (error); | |||||
} | |||||
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_WLOCK(ch); | |||||
SRV_OBJECT(ch, cfg->no.kidx) = NULL; | |||||
IPFW_WUNLOCK(ch); | |||||
nat64stl_detach_config(ch, cfg); | |||||
IPFW_UH_WUNLOCK(ch); | |||||
nat64stl_free_config(cfg); | |||||
return (0); | |||||
} | |||||
/* | |||||
* Lists all nat64 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)->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 nat64 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); | |||||
} | |||||
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 }, | |||||
}; | |||||
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_objhash_foreach_type(CHAIN_TO_SRV(ch), destroy_config_cb, ch, | |||||
IPFW_TLV_NAT64STL_NAME); | |||||
V_nat64stl_eid = 0; | |||||
} | |||||