mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
![Richard Scheffenegger](/assets/img/avatar_default.png)
Update all remaining references to the struct tcphdr th_x2 field. This completes the compatibilty of various aspects with AccECN (TH_AE), after the internal ipfw "re-checksum required" was moved to use the TH_RES1 flag. No functional change. Reviewed By: tuexen, #transport, glebius Sponsored by: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D43172
967 lines
24 KiB
C
967 lines
24 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright 2005, Gleb Smirnoff <glebius@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 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.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/ctype.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/syslog.h>
|
|
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/tcp.h>
|
|
#include <machine/in_cksum.h>
|
|
|
|
#include <net/dlt.h>
|
|
#include <net/ethernet.h>
|
|
|
|
#include <netinet/libalias/alias.h>
|
|
#include <netinet/libalias/alias_local.h>
|
|
|
|
#include <netgraph/ng_message.h>
|
|
#include <netgraph/ng_parse.h>
|
|
#include <netgraph/ng_nat.h>
|
|
#include <netgraph/netgraph.h>
|
|
|
|
static ng_constructor_t ng_nat_constructor;
|
|
static ng_rcvmsg_t ng_nat_rcvmsg;
|
|
static ng_shutdown_t ng_nat_shutdown;
|
|
static ng_newhook_t ng_nat_newhook;
|
|
static ng_rcvdata_t ng_nat_rcvdata;
|
|
static ng_disconnect_t ng_nat_disconnect;
|
|
|
|
static unsigned int ng_nat_translate_flags(unsigned int x);
|
|
|
|
/* Parse type for struct ng_nat_mode. */
|
|
static const struct ng_parse_struct_field ng_nat_mode_fields[]
|
|
= NG_NAT_MODE_INFO;
|
|
static const struct ng_parse_type ng_nat_mode_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_mode_fields
|
|
};
|
|
|
|
/* Parse type for 'description' field in structs. */
|
|
static const struct ng_parse_fixedstring_info ng_nat_description_info
|
|
= { NG_NAT_DESC_LENGTH };
|
|
static const struct ng_parse_type ng_nat_description_type = {
|
|
&ng_parse_fixedstring_type,
|
|
&ng_nat_description_info
|
|
};
|
|
|
|
/* Parse type for struct ng_nat_redirect_port. */
|
|
static const struct ng_parse_struct_field ng_nat_redirect_port_fields[]
|
|
= NG_NAT_REDIRECT_PORT_TYPE_INFO(&ng_nat_description_type);
|
|
static const struct ng_parse_type ng_nat_redirect_port_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_redirect_port_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_nat_redirect_addr. */
|
|
static const struct ng_parse_struct_field ng_nat_redirect_addr_fields[]
|
|
= NG_NAT_REDIRECT_ADDR_TYPE_INFO(&ng_nat_description_type);
|
|
static const struct ng_parse_type ng_nat_redirect_addr_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_redirect_addr_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_nat_redirect_proto. */
|
|
static const struct ng_parse_struct_field ng_nat_redirect_proto_fields[]
|
|
= NG_NAT_REDIRECT_PROTO_TYPE_INFO(&ng_nat_description_type);
|
|
static const struct ng_parse_type ng_nat_redirect_proto_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_redirect_proto_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_nat_add_server. */
|
|
static const struct ng_parse_struct_field ng_nat_add_server_fields[]
|
|
= NG_NAT_ADD_SERVER_TYPE_INFO;
|
|
static const struct ng_parse_type ng_nat_add_server_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_add_server_fields
|
|
};
|
|
|
|
/* Parse type for one struct ng_nat_listrdrs_entry. */
|
|
static const struct ng_parse_struct_field ng_nat_listrdrs_entry_fields[]
|
|
= NG_NAT_LISTRDRS_ENTRY_TYPE_INFO(&ng_nat_description_type);
|
|
static const struct ng_parse_type ng_nat_listrdrs_entry_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_listrdrs_entry_fields
|
|
};
|
|
|
|
/* Parse type for 'redirects' array in struct ng_nat_list_redirects. */
|
|
static int
|
|
ng_nat_listrdrs_ary_getLength(const struct ng_parse_type *type,
|
|
const u_char *start, const u_char *buf)
|
|
{
|
|
const struct ng_nat_list_redirects *lr;
|
|
|
|
lr = (const struct ng_nat_list_redirects *)
|
|
(buf - offsetof(struct ng_nat_list_redirects, redirects));
|
|
return lr->total_count;
|
|
}
|
|
|
|
static const struct ng_parse_array_info ng_nat_listrdrs_ary_info = {
|
|
&ng_nat_listrdrs_entry_type,
|
|
&ng_nat_listrdrs_ary_getLength,
|
|
NULL
|
|
};
|
|
static const struct ng_parse_type ng_nat_listrdrs_ary_type = {
|
|
&ng_parse_array_type,
|
|
&ng_nat_listrdrs_ary_info
|
|
};
|
|
|
|
/* Parse type for struct ng_nat_list_redirects. */
|
|
static const struct ng_parse_struct_field ng_nat_list_redirects_fields[]
|
|
= NG_NAT_LIST_REDIRECTS_TYPE_INFO(&ng_nat_listrdrs_ary_type);
|
|
static const struct ng_parse_type ng_nat_list_redirects_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_list_redirects_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_nat_libalias_info. */
|
|
static const struct ng_parse_struct_field ng_nat_libalias_info_fields[]
|
|
= NG_NAT_LIBALIAS_INFO;
|
|
static const struct ng_parse_type ng_nat_libalias_info_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_nat_libalias_info_fields
|
|
};
|
|
|
|
/* List of commands and how to convert arguments to/from ASCII. */
|
|
static const struct ng_cmdlist ng_nat_cmdlist[] = {
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_SET_IPADDR,
|
|
"setaliasaddr",
|
|
&ng_parse_ipaddr_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_SET_MODE,
|
|
"setmode",
|
|
&ng_nat_mode_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_SET_TARGET,
|
|
"settarget",
|
|
&ng_parse_ipaddr_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_REDIRECT_PORT,
|
|
"redirectport",
|
|
&ng_nat_redirect_port_type,
|
|
&ng_parse_uint32_type
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_REDIRECT_ADDR,
|
|
"redirectaddr",
|
|
&ng_nat_redirect_addr_type,
|
|
&ng_parse_uint32_type
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_REDIRECT_PROTO,
|
|
"redirectproto",
|
|
&ng_nat_redirect_proto_type,
|
|
&ng_parse_uint32_type
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_REDIRECT_DYNAMIC,
|
|
"redirectdynamic",
|
|
&ng_parse_uint32_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_REDIRECT_DELETE,
|
|
"redirectdelete",
|
|
&ng_parse_uint32_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_ADD_SERVER,
|
|
"addserver",
|
|
&ng_nat_add_server_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_LIST_REDIRECTS,
|
|
"listredirects",
|
|
NULL,
|
|
&ng_nat_list_redirects_type
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_PROXY_RULE,
|
|
"proxyrule",
|
|
&ng_parse_string_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_LIBALIAS_INFO,
|
|
"libaliasinfo",
|
|
NULL,
|
|
&ng_nat_libalias_info_type
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_SET_DLT,
|
|
"setdlt",
|
|
&ng_parse_uint8_type,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_NAT_COOKIE,
|
|
NGM_NAT_GET_DLT,
|
|
"getdlt",
|
|
NULL,
|
|
&ng_parse_uint8_type
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
/* Netgraph node type descriptor. */
|
|
static struct ng_type typestruct = {
|
|
.version = NG_ABI_VERSION,
|
|
.name = NG_NAT_NODE_TYPE,
|
|
.constructor = ng_nat_constructor,
|
|
.rcvmsg = ng_nat_rcvmsg,
|
|
.shutdown = ng_nat_shutdown,
|
|
.newhook = ng_nat_newhook,
|
|
.rcvdata = ng_nat_rcvdata,
|
|
.disconnect = ng_nat_disconnect,
|
|
.cmdlist = ng_nat_cmdlist,
|
|
};
|
|
NETGRAPH_INIT(nat, &typestruct);
|
|
MODULE_DEPEND(ng_nat, libalias, 1, 1, 1);
|
|
|
|
/* Element for list of redirects. */
|
|
struct ng_nat_rdr_lst {
|
|
STAILQ_ENTRY(ng_nat_rdr_lst) entries;
|
|
struct alias_link *lnk;
|
|
struct ng_nat_listrdrs_entry rdr;
|
|
};
|
|
STAILQ_HEAD(rdrhead, ng_nat_rdr_lst);
|
|
|
|
/* Information we store for each node. */
|
|
struct ng_nat_priv {
|
|
node_p node; /* back pointer to node */
|
|
hook_p in; /* hook for demasquerading */
|
|
hook_p out; /* hook for masquerading */
|
|
struct libalias *lib; /* libalias handler */
|
|
uint32_t flags; /* status flags */
|
|
uint32_t rdrcount; /* number or redirects in list */
|
|
uint32_t nextid; /* for next in turn in list */
|
|
struct rdrhead redirhead; /* redirect list header */
|
|
uint8_t dlt; /* DLT_XXX from bpf.h */
|
|
};
|
|
typedef struct ng_nat_priv *priv_p;
|
|
|
|
/* Values of flags */
|
|
#define NGNAT_CONNECTED 0x1 /* We have both hooks connected */
|
|
#define NGNAT_ADDR_DEFINED 0x2 /* NGM_NAT_SET_IPADDR happened */
|
|
|
|
static int
|
|
ng_nat_constructor(node_p node)
|
|
{
|
|
priv_p priv;
|
|
|
|
/* Initialize private descriptor. */
|
|
priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
|
|
|
|
/* Init aliasing engine. */
|
|
priv->lib = LibAliasInit(NULL);
|
|
|
|
/* Set same ports on. */
|
|
(void )LibAliasSetMode(priv->lib, PKT_ALIAS_SAME_PORTS,
|
|
PKT_ALIAS_SAME_PORTS);
|
|
|
|
/* Init redirects housekeeping. */
|
|
priv->rdrcount = 0;
|
|
priv->nextid = 1;
|
|
priv->dlt = DLT_RAW;
|
|
STAILQ_INIT(&priv->redirhead);
|
|
|
|
/* Link structs together. */
|
|
NG_NODE_SET_PRIVATE(node, priv);
|
|
priv->node = node;
|
|
|
|
/*
|
|
* libalias is not thread safe, so our node
|
|
* must be single threaded.
|
|
*/
|
|
NG_NODE_FORCE_WRITER(node);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_nat_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
if (strcmp(name, NG_NAT_HOOK_IN) == 0) {
|
|
priv->in = hook;
|
|
} else if (strcmp(name, NG_NAT_HOOK_OUT) == 0) {
|
|
priv->out = hook;
|
|
} else
|
|
return (EINVAL);
|
|
|
|
if (priv->out != NULL &&
|
|
priv->in != NULL)
|
|
priv->flags |= NGNAT_CONNECTED;
|
|
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
ng_nat_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ng_mesg *resp = NULL;
|
|
struct ng_mesg *msg;
|
|
int error = 0;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
|
|
switch (msg->header.typecookie) {
|
|
case NGM_NAT_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_NAT_SET_IPADDR:
|
|
{
|
|
struct in_addr *const ia = (struct in_addr *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*ia)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
LibAliasSetAddress(priv->lib, *ia);
|
|
|
|
priv->flags |= NGNAT_ADDR_DEFINED;
|
|
}
|
|
break;
|
|
case NGM_NAT_SET_MODE:
|
|
{
|
|
struct ng_nat_mode *const mode =
|
|
(struct ng_nat_mode *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*mode)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (LibAliasSetMode(priv->lib,
|
|
ng_nat_translate_flags(mode->flags),
|
|
ng_nat_translate_flags(mode->mask)) < 0) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case NGM_NAT_SET_TARGET:
|
|
{
|
|
struct in_addr *const ia = (struct in_addr *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*ia)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
LibAliasSetTarget(priv->lib, *ia);
|
|
}
|
|
break;
|
|
case NGM_NAT_REDIRECT_PORT:
|
|
{
|
|
struct ng_nat_rdr_lst *entry;
|
|
struct ng_nat_redirect_port *const rp =
|
|
(struct ng_nat_redirect_port *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*rp)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if ((entry = malloc(sizeof(struct ng_nat_rdr_lst),
|
|
M_NETGRAPH, M_NOWAIT | M_ZERO)) == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/* Try actual redirect. */
|
|
entry->lnk = LibAliasRedirectPort(priv->lib,
|
|
rp->local_addr, htons(rp->local_port),
|
|
rp->remote_addr, htons(rp->remote_port),
|
|
rp->alias_addr, htons(rp->alias_port),
|
|
rp->proto);
|
|
|
|
if (entry->lnk == NULL) {
|
|
error = ENOMEM;
|
|
free(entry, M_NETGRAPH);
|
|
break;
|
|
}
|
|
|
|
/* Successful, save info in our internal list. */
|
|
entry->rdr.local_addr = rp->local_addr;
|
|
entry->rdr.alias_addr = rp->alias_addr;
|
|
entry->rdr.remote_addr = rp->remote_addr;
|
|
entry->rdr.local_port = rp->local_port;
|
|
entry->rdr.alias_port = rp->alias_port;
|
|
entry->rdr.remote_port = rp->remote_port;
|
|
entry->rdr.proto = rp->proto;
|
|
bcopy(rp->description, entry->rdr.description,
|
|
NG_NAT_DESC_LENGTH);
|
|
|
|
/* Safety precaution. */
|
|
entry->rdr.description[NG_NAT_DESC_LENGTH-1] = '\0';
|
|
|
|
entry->rdr.id = priv->nextid++;
|
|
priv->rdrcount++;
|
|
|
|
/* Link to list of redirects. */
|
|
STAILQ_INSERT_TAIL(&priv->redirhead, entry, entries);
|
|
|
|
/* Response with id of newly added entry. */
|
|
NG_MKRESPONSE(resp, msg, sizeof(entry->rdr.id), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
bcopy(&entry->rdr.id, resp->data, sizeof(entry->rdr.id));
|
|
}
|
|
break;
|
|
case NGM_NAT_REDIRECT_ADDR:
|
|
{
|
|
struct ng_nat_rdr_lst *entry;
|
|
struct ng_nat_redirect_addr *const ra =
|
|
(struct ng_nat_redirect_addr *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*ra)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if ((entry = malloc(sizeof(struct ng_nat_rdr_lst),
|
|
M_NETGRAPH, M_NOWAIT | M_ZERO)) == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/* Try actual redirect. */
|
|
entry->lnk = LibAliasRedirectAddr(priv->lib,
|
|
ra->local_addr, ra->alias_addr);
|
|
|
|
if (entry->lnk == NULL) {
|
|
error = ENOMEM;
|
|
free(entry, M_NETGRAPH);
|
|
break;
|
|
}
|
|
|
|
/* Successful, save info in our internal list. */
|
|
entry->rdr.local_addr = ra->local_addr;
|
|
entry->rdr.alias_addr = ra->alias_addr;
|
|
entry->rdr.proto = NG_NAT_REDIRPROTO_ADDR;
|
|
bcopy(ra->description, entry->rdr.description,
|
|
NG_NAT_DESC_LENGTH);
|
|
|
|
/* Safety precaution. */
|
|
entry->rdr.description[NG_NAT_DESC_LENGTH-1] = '\0';
|
|
|
|
entry->rdr.id = priv->nextid++;
|
|
priv->rdrcount++;
|
|
|
|
/* Link to list of redirects. */
|
|
STAILQ_INSERT_TAIL(&priv->redirhead, entry, entries);
|
|
|
|
/* Response with id of newly added entry. */
|
|
NG_MKRESPONSE(resp, msg, sizeof(entry->rdr.id), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
bcopy(&entry->rdr.id, resp->data, sizeof(entry->rdr.id));
|
|
}
|
|
break;
|
|
case NGM_NAT_REDIRECT_PROTO:
|
|
{
|
|
struct ng_nat_rdr_lst *entry;
|
|
struct ng_nat_redirect_proto *const rp =
|
|
(struct ng_nat_redirect_proto *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*rp)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if ((entry = malloc(sizeof(struct ng_nat_rdr_lst),
|
|
M_NETGRAPH, M_NOWAIT | M_ZERO)) == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/* Try actual redirect. */
|
|
entry->lnk = LibAliasRedirectProto(priv->lib,
|
|
rp->local_addr, rp->remote_addr,
|
|
rp->alias_addr, rp->proto);
|
|
|
|
if (entry->lnk == NULL) {
|
|
error = ENOMEM;
|
|
free(entry, M_NETGRAPH);
|
|
break;
|
|
}
|
|
|
|
/* Successful, save info in our internal list. */
|
|
entry->rdr.local_addr = rp->local_addr;
|
|
entry->rdr.alias_addr = rp->alias_addr;
|
|
entry->rdr.remote_addr = rp->remote_addr;
|
|
entry->rdr.proto = rp->proto;
|
|
bcopy(rp->description, entry->rdr.description,
|
|
NG_NAT_DESC_LENGTH);
|
|
|
|
/* Safety precaution. */
|
|
entry->rdr.description[NG_NAT_DESC_LENGTH-1] = '\0';
|
|
|
|
entry->rdr.id = priv->nextid++;
|
|
priv->rdrcount++;
|
|
|
|
/* Link to list of redirects. */
|
|
STAILQ_INSERT_TAIL(&priv->redirhead, entry, entries);
|
|
|
|
/* Response with id of newly added entry. */
|
|
NG_MKRESPONSE(resp, msg, sizeof(entry->rdr.id), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
bcopy(&entry->rdr.id, resp->data, sizeof(entry->rdr.id));
|
|
}
|
|
break;
|
|
case NGM_NAT_REDIRECT_DYNAMIC:
|
|
case NGM_NAT_REDIRECT_DELETE:
|
|
{
|
|
struct ng_nat_rdr_lst *entry;
|
|
uint32_t *const id = (uint32_t *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*id)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Find entry with supplied id. */
|
|
STAILQ_FOREACH(entry, &priv->redirhead, entries) {
|
|
if (entry->rdr.id == *id)
|
|
break;
|
|
}
|
|
|
|
/* Not found. */
|
|
if (entry == NULL) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
|
|
if (msg->header.cmd == NGM_NAT_REDIRECT_DYNAMIC) {
|
|
if (LibAliasRedirectDynamic(priv->lib,
|
|
entry->lnk) == -1) {
|
|
error = ENOTTY; /* XXX Something better? */
|
|
break;
|
|
}
|
|
} else { /* NGM_NAT_REDIRECT_DELETE */
|
|
LibAliasRedirectDelete(priv->lib, entry->lnk);
|
|
}
|
|
|
|
/* Delete entry from our internal list. */
|
|
priv->rdrcount--;
|
|
STAILQ_REMOVE(&priv->redirhead, entry, ng_nat_rdr_lst, entries);
|
|
free(entry, M_NETGRAPH);
|
|
}
|
|
break;
|
|
case NGM_NAT_ADD_SERVER:
|
|
{
|
|
struct ng_nat_rdr_lst *entry;
|
|
struct ng_nat_add_server *const as =
|
|
(struct ng_nat_add_server *)msg->data;
|
|
|
|
if (msg->header.arglen < sizeof(*as)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Find entry with supplied id. */
|
|
STAILQ_FOREACH(entry, &priv->redirhead, entries) {
|
|
if (entry->rdr.id == as->id)
|
|
break;
|
|
}
|
|
|
|
/* Not found. */
|
|
if (entry == NULL) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
|
|
if (LibAliasAddServer(priv->lib, entry->lnk,
|
|
as->addr, htons(as->port)) == -1) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
entry->rdr.lsnat++;
|
|
}
|
|
break;
|
|
case NGM_NAT_LIST_REDIRECTS:
|
|
{
|
|
struct ng_nat_rdr_lst *entry;
|
|
struct ng_nat_list_redirects *ary;
|
|
int i = 0;
|
|
|
|
NG_MKRESPONSE(resp, msg, sizeof(*ary) +
|
|
(priv->rdrcount) * sizeof(*entry), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
ary = (struct ng_nat_list_redirects *)resp->data;
|
|
ary->total_count = priv->rdrcount;
|
|
|
|
STAILQ_FOREACH(entry, &priv->redirhead, entries) {
|
|
bcopy(&entry->rdr, &ary->redirects[i++],
|
|
sizeof(struct ng_nat_listrdrs_entry));
|
|
}
|
|
}
|
|
break;
|
|
case NGM_NAT_PROXY_RULE:
|
|
{
|
|
char *cmd = (char *)msg->data;
|
|
|
|
if (msg->header.arglen < 6) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (LibAliasProxyRule(priv->lib, cmd) != 0)
|
|
error = ENOMEM;
|
|
}
|
|
break;
|
|
case NGM_NAT_LIBALIAS_INFO:
|
|
{
|
|
struct ng_nat_libalias_info *i;
|
|
|
|
NG_MKRESPONSE(resp, msg,
|
|
sizeof(struct ng_nat_libalias_info), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
i = (struct ng_nat_libalias_info *)resp->data;
|
|
#define COPY(F) do { \
|
|
if (priv->lib->F >= 0 && priv->lib->F < UINT32_MAX) \
|
|
i->F = priv->lib->F; \
|
|
else \
|
|
i->F = UINT32_MAX; \
|
|
} while (0)
|
|
|
|
COPY(icmpLinkCount);
|
|
COPY(udpLinkCount);
|
|
COPY(tcpLinkCount);
|
|
COPY(pptpLinkCount);
|
|
COPY(sctpLinkCount);
|
|
COPY(protoLinkCount);
|
|
COPY(fragmentIdLinkCount);
|
|
COPY(fragmentPtrLinkCount);
|
|
COPY(sockCount);
|
|
#undef COPY
|
|
}
|
|
break;
|
|
case NGM_NAT_SET_DLT:
|
|
if (msg->header.arglen != sizeof(uint8_t)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
switch (*(uint8_t *) msg->data) {
|
|
case DLT_EN10MB:
|
|
case DLT_RAW:
|
|
priv->dlt = *(uint8_t *) msg->data;
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL; /* unknown command */
|
|
break;
|
|
}
|
|
break;
|
|
case NGM_NAT_GET_DLT:
|
|
NG_MKRESPONSE(resp, msg, sizeof(uint8_t), M_WAITOK);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
*((uint8_t *) resp->data) = priv->dlt;
|
|
break;
|
|
default:
|
|
error = EINVAL; /* unknown cookie type */
|
|
break;
|
|
}
|
|
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ng_nat_rcvdata(hook_p hook, item_p item )
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
struct mbuf *m;
|
|
struct ip *ip;
|
|
int rval, ipofs, error = 0;
|
|
char *c;
|
|
|
|
/* We have no required hooks. */
|
|
if (!(priv->flags & NGNAT_CONNECTED)) {
|
|
NG_FREE_ITEM(item);
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* We have no alias address yet to do anything. */
|
|
if (!(priv->flags & NGNAT_ADDR_DEFINED))
|
|
goto send;
|
|
|
|
m = NGI_M(item);
|
|
|
|
if ((m = m_megapullup(m, m->m_pkthdr.len)) == NULL) {
|
|
NGI_M(item) = NULL; /* avoid double free */
|
|
NG_FREE_ITEM(item);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
NGI_M(item) = m;
|
|
|
|
switch (priv->dlt) {
|
|
case DLT_RAW:
|
|
ipofs = 0;
|
|
break;
|
|
case DLT_EN10MB:
|
|
{
|
|
struct ether_header *eh;
|
|
|
|
if (m->m_pkthdr.len < sizeof(struct ether_header)) {
|
|
NG_FREE_ITEM(item);
|
|
return (ENXIO);
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
switch (ntohs(eh->ether_type)) {
|
|
case ETHERTYPE_IP:
|
|
ipofs = sizeof(struct ether_header);
|
|
break;
|
|
default:
|
|
goto send;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
panic("Corrupted priv->dlt: %u", priv->dlt);
|
|
}
|
|
|
|
if (m->m_pkthdr.len < ipofs + sizeof(struct ip))
|
|
goto send; /* packet too short to hold IP */
|
|
|
|
c = (char *)mtodo(m, ipofs);
|
|
ip = (struct ip *)mtodo(m, ipofs);
|
|
|
|
if (ip->ip_v != IPVERSION)
|
|
goto send; /* other IP version, let it pass */
|
|
if (m->m_pkthdr.len < ipofs + ntohs(ip->ip_len))
|
|
goto send; /* packet too short (i.e. fragmented or broken) */
|
|
|
|
/*
|
|
* We drop packet when:
|
|
* 1. libalias returns PKT_ALIAS_ERROR;
|
|
* 2. For incoming packets:
|
|
* a) for unresolved fragments;
|
|
* b) libalias returns PKT_ALIAS_IGNORED and
|
|
* PKT_ALIAS_DENY_INCOMING flag is set.
|
|
*/
|
|
if (hook == priv->in) {
|
|
rval = LibAliasIn(priv->lib, c, m->m_len - ipofs +
|
|
M_TRAILINGSPACE(m));
|
|
if (rval == PKT_ALIAS_ERROR ||
|
|
rval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
|
|
(rval == PKT_ALIAS_IGNORED &&
|
|
(priv->lib->packetAliasMode &
|
|
PKT_ALIAS_DENY_INCOMING) != 0)) {
|
|
NG_FREE_ITEM(item);
|
|
return (EINVAL);
|
|
}
|
|
} else if (hook == priv->out) {
|
|
rval = LibAliasOut(priv->lib, c, m->m_len - ipofs +
|
|
M_TRAILINGSPACE(m));
|
|
if (rval == PKT_ALIAS_ERROR) {
|
|
NG_FREE_ITEM(item);
|
|
return (EINVAL);
|
|
}
|
|
} else
|
|
panic("ng_nat: unknown hook!\n");
|
|
|
|
if (rval == PKT_ALIAS_RESPOND)
|
|
m->m_flags |= M_SKIP_FIREWALL;
|
|
m->m_pkthdr.len = m->m_len = ntohs(ip->ip_len) + ipofs;
|
|
|
|
if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&
|
|
ip->ip_p == IPPROTO_TCP) {
|
|
struct tcphdr *th = (struct tcphdr *)((caddr_t)ip +
|
|
(ip->ip_hl << 2));
|
|
|
|
/*
|
|
* Here is our terrible HACK.
|
|
*
|
|
* Sometimes LibAlias edits contents of TCP packet.
|
|
* In this case it needs to recompute full TCP
|
|
* checksum. However, the problem is that LibAlias
|
|
* doesn't have any idea about checksum offloading
|
|
* in kernel. To workaround this, we do not do
|
|
* checksumming in LibAlias, but only mark the
|
|
* packets with TH_RES1 in the th_x2 field. If we
|
|
* receive a marked packet, we calculate correct
|
|
* checksum for it aware of offloading.
|
|
*
|
|
* Why do I do such a terrible hack instead of
|
|
* recalculating checksum for each packet?
|
|
* Because the previous checksum was not checked!
|
|
* Recalculating checksums for EVERY packet will
|
|
* hide ALL transmission errors. Yes, marked packets
|
|
* still suffer from this problem. But, sigh, natd(8)
|
|
* has this problem, too.
|
|
*/
|
|
|
|
if (tcp_get_flags(th) & TH_RES1) {
|
|
uint16_t ip_len = ntohs(ip->ip_len);
|
|
|
|
tcp_set_flags(th, tcp_get_flags(th) & ~TH_RES1);
|
|
th->th_sum = in_pseudo(ip->ip_src.s_addr,
|
|
ip->ip_dst.s_addr, htons(IPPROTO_TCP +
|
|
ip_len - (ip->ip_hl << 2)));
|
|
|
|
if ((m->m_pkthdr.csum_flags & CSUM_TCP) == 0) {
|
|
m->m_pkthdr.csum_data = offsetof(struct tcphdr,
|
|
th_sum);
|
|
in_delayed_cksum(m);
|
|
}
|
|
}
|
|
}
|
|
|
|
send:
|
|
if (hook == priv->in)
|
|
NG_FWD_ITEM_HOOK(error, item, priv->out);
|
|
else
|
|
NG_FWD_ITEM_HOOK(error, item, priv->in);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ng_nat_shutdown(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(node);
|
|
|
|
/* Free redirects list. */
|
|
while (!STAILQ_EMPTY(&priv->redirhead)) {
|
|
struct ng_nat_rdr_lst *entry = STAILQ_FIRST(&priv->redirhead);
|
|
STAILQ_REMOVE_HEAD(&priv->redirhead, entries);
|
|
free(entry, M_NETGRAPH);
|
|
}
|
|
|
|
/* Final free. */
|
|
LibAliasUninit(priv->lib);
|
|
free(priv, M_NETGRAPH);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_nat_disconnect(hook_p hook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
priv->flags &= ~NGNAT_CONNECTED;
|
|
|
|
if (hook == priv->out)
|
|
priv->out = NULL;
|
|
if (hook == priv->in)
|
|
priv->in = NULL;
|
|
|
|
if (priv->out == NULL && priv->in == NULL)
|
|
ng_rmnode_self(NG_HOOK_NODE(hook));
|
|
|
|
return (0);
|
|
}
|
|
|
|
static unsigned int
|
|
ng_nat_translate_flags(unsigned int x)
|
|
{
|
|
unsigned int res = 0;
|
|
|
|
if (x & NG_NAT_LOG)
|
|
res |= PKT_ALIAS_LOG;
|
|
if (x & NG_NAT_DENY_INCOMING)
|
|
res |= PKT_ALIAS_DENY_INCOMING;
|
|
if (x & NG_NAT_SAME_PORTS)
|
|
res |= PKT_ALIAS_SAME_PORTS;
|
|
if (x & NG_NAT_UNREGISTERED_ONLY)
|
|
res |= PKT_ALIAS_UNREGISTERED_ONLY;
|
|
if (x & NG_NAT_RESET_ON_ADDR_CHANGE)
|
|
res |= PKT_ALIAS_RESET_ON_ADDR_CHANGE;
|
|
if (x & NG_NAT_PROXY_ONLY)
|
|
res |= PKT_ALIAS_PROXY_ONLY;
|
|
if (x & NG_NAT_REVERSE)
|
|
res |= PKT_ALIAS_REVERSE;
|
|
if (x & NG_NAT_UNREGISTERED_CGN)
|
|
res |= PKT_ALIAS_UNREGISTERED_CGN;
|
|
|
|
return (res);
|
|
}
|