Commit 9fafcd7b authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller

[NETFILTER]: nf_conntrack/nf_nat: add SIP helper port

Add IPv4 and IPv6 capable nf_conntrack port of the SIP conntrack/NAT helper.
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f09943fe
#ifndef __NF_CONNTRACK_SIP_H__
#define __NF_CONNTRACK_SIP_H__
#ifdef __KERNEL__
#define SIP_PORT 5060
#define SIP_TIMEOUT 3600
enum sip_header_pos {
POS_REG_REQ_URI,
POS_REQ_URI,
POS_FROM,
POS_TO,
POS_VIA,
POS_CONTACT,
POS_CONTENT,
POS_MEDIA,
POS_OWNER_IP4,
POS_CONNECTION_IP4,
POS_OWNER_IP6,
POS_CONNECTION_IP6,
POS_SDP_HEADER,
};
extern unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
const char **dptr);
extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conntrack_expect *exp,
const char *dptr);
extern int ct_sip_get_info(struct nf_conn *ct, const char *dptr, size_t dlen,
unsigned int *matchoff, unsigned int *matchlen,
enum sip_header_pos pos);
extern int ct_sip_lnlen(const char *line, const char *limit);
extern const char *ct_sip_search(const char *needle, const char *haystack,
size_t needle_len, size_t haystack_len,
int case_sensitive);
#endif /* __KERNEL__ */
#endif /* __NF_CONNTRACK_SIP_H__ */
......@@ -555,6 +555,11 @@ config IP_NF_NAT_SIP
default IP_NF_NAT if IP_NF_SIP=y
default m if IP_NF_SIP=m
config NF_NAT_SIP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_SIP
# mangle + specific targets
config IP_NF_MANGLE
tristate "Packet mangling"
......
......@@ -55,6 +55,7 @@ obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
......
/* SIP extension for UDP NAT alteration.
*
* (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
* based on RR's ip_nat_ftp.c and other modules.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_sip.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
MODULE_DESCRIPTION("SIP NAT helper");
MODULE_ALIAS("ip_nat_sip");
#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif
struct addr_map {
struct {
char src[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
char dst[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
unsigned int srclen, srciplen;
unsigned int dstlen, dstiplen;
} addr[IP_CT_DIR_MAX];
};
static void addr_map_init(struct nf_conn *ct, struct addr_map *map)
{
struct nf_conntrack_tuple *t;
enum ip_conntrack_dir dir;
unsigned int n;
for (dir = 0; dir < IP_CT_DIR_MAX; dir++) {
t = &ct->tuplehash[dir].tuple;
n = sprintf(map->addr[dir].src, "%u.%u.%u.%u",
NIPQUAD(t->src.u3.ip));
map->addr[dir].srciplen = n;
n += sprintf(map->addr[dir].src + n, ":%u",
ntohs(t->src.u.udp.port));
map->addr[dir].srclen = n;
n = sprintf(map->addr[dir].dst, "%u.%u.%u.%u",
NIPQUAD(t->dst.u3.ip));
map->addr[dir].dstiplen = n;
n += sprintf(map->addr[dir].dst + n, ":%u",
ntohs(t->dst.u.udp.port));
map->addr[dir].dstlen = n;
}
}
static int map_sip_addr(struct sk_buff **pskb, enum ip_conntrack_info ctinfo,
struct nf_conn *ct, const char **dptr, size_t dlen,
enum sip_header_pos pos, struct addr_map *map)
{
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
unsigned int matchlen, matchoff, addrlen;
char *addr;
if (ct_sip_get_info(ct, *dptr, dlen, &matchoff, &matchlen, pos) <= 0)
return 1;
if ((matchlen == map->addr[dir].srciplen ||
matchlen == map->addr[dir].srclen) &&
memcmp(*dptr + matchoff, map->addr[dir].src, matchlen) == 0) {
addr = map->addr[!dir].dst;
addrlen = map->addr[!dir].dstlen;
} else if ((matchlen == map->addr[dir].dstiplen ||
matchlen == map->addr[dir].dstlen) &&
memcmp(*dptr + matchoff, map->addr[dir].dst, matchlen) == 0) {
addr = map->addr[!dir].src;
addrlen = map->addr[!dir].srclen;
} else
return 1;
if (!nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
matchoff, matchlen, addr, addrlen))
return 0;
*dptr = (*pskb)->data + (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
return 1;
}
static unsigned int ip_nat_sip(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
const char **dptr)
{
enum sip_header_pos pos;
struct addr_map map;
int dataoff, datalen;
dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
datalen = (*pskb)->len - dataoff;
if (datalen < sizeof("SIP/2.0") - 1)
return NF_DROP;
addr_map_init(ct, &map);
/* Basic rules: requests and responses. */
if (strncmp(*dptr, "SIP/2.0", sizeof("SIP/2.0") - 1) != 0) {
/* 10.2: Constructing the REGISTER Request:
*
* The "userinfo" and "@" components of the SIP URI MUST NOT
* be present.
*/
if (datalen >= sizeof("REGISTER") - 1 &&
strncmp(*dptr, "REGISTER", sizeof("REGISTER") - 1) == 0)
pos = POS_REG_REQ_URI;
else
pos = POS_REQ_URI;
if (!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, pos, &map))
return NF_DROP;
}
if (!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_FROM, &map) ||
!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_TO, &map) ||
!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_VIA, &map) ||
!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_CONTACT, &map))
return NF_DROP;
return NF_ACCEPT;
}
static unsigned int mangle_sip_packet(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
const char **dptr, size_t dlen,
char *buffer, int bufflen,
enum sip_header_pos pos)
{
unsigned int matchlen, matchoff;
if (ct_sip_get_info(ct, *dptr, dlen, &matchoff, &matchlen, pos) <= 0)
return 0;
if (!nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
matchoff, matchlen, buffer, bufflen))
return 0;
/* We need to reload this. Thanks Patrick. */
*dptr = (*pskb)->data + (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
return 1;
}
static int mangle_content_len(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
const char *dptr)
{
unsigned int dataoff, matchoff, matchlen;
char buffer[sizeof("65536")];
int bufflen;
dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
/* Get actual SDP lenght */
if (ct_sip_get_info(ct, dptr, (*pskb)->len - dataoff, &matchoff,
&matchlen, POS_SDP_HEADER) > 0) {
/* since ct_sip_get_info() give us a pointer passing 'v='
we need to add 2 bytes in this count. */
int c_len = (*pskb)->len - dataoff - matchoff + 2;
/* Now, update SDP length */
if (ct_sip_get_info(ct, dptr, (*pskb)->len - dataoff, &matchoff,
&matchlen, POS_CONTENT) > 0) {
bufflen = sprintf(buffer, "%u", c_len);
return nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
matchoff, matchlen,
buffer, bufflen);
}
}
return 0;
}
static unsigned int mangle_sdp(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
__be32 newip, u_int16_t port,
const char *dptr)
{
char buffer[sizeof("nnn.nnn.nnn.nnn")];
unsigned int dataoff, bufflen;
dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
/* Mangle owner and contact info. */
bufflen = sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(newip));
if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
buffer, bufflen, POS_OWNER_IP4))
return 0;
if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
buffer, bufflen, POS_CONNECTION_IP4))
return 0;
/* Mangle media port. */
bufflen = sprintf(buffer, "%u", port);
if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
buffer, bufflen, POS_MEDIA))
return 0;
return mangle_content_len(pskb, ctinfo, ct, dptr);
}
/* So, this packet has hit the connection tracking matching code.
Mangle it, and change the expectation to match the new version. */
static unsigned int ip_nat_sdp(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conntrack_expect *exp,
const char *dptr)
{
struct nf_conn *ct = exp->master;
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
__be32 newip;
u_int16_t port;
DEBUGP("ip_nat_sdp():\n");
/* Connection will come from reply */
newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
exp->tuple.dst.u3.ip = newip;
exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
exp->dir = !dir;
/* When you see the packet, we need to NAT it the same as the
this one. */
exp->expectfn = nf_nat_follow_master;
/* Try to get same port: if not, try to change it. */
for (port = ntohs(exp->saved_proto.udp.port); port != 0; port++) {
exp->tuple.dst.u.udp.port = htons(port);
if (nf_conntrack_expect_related(exp) == 0)
break;
}
if (port == 0)
return NF_DROP;
if (!mangle_sdp(pskb, ctinfo, ct, newip, port, dptr)) {
nf_conntrack_unexpect_related(exp);
return NF_DROP;
}
return NF_ACCEPT;
}
static void __exit nf_nat_sip_fini(void)
{
rcu_assign_pointer(nf_nat_sip_hook, NULL);
rcu_assign_pointer(nf_nat_sdp_hook, NULL);
synchronize_rcu();
}
static int __init nf_nat_sip_init(void)
{
BUG_ON(rcu_dereference(nf_nat_sip_hook));
BUG_ON(rcu_dereference(nf_nat_sdp_hook));
rcu_assign_pointer(nf_nat_sip_hook, ip_nat_sip);
rcu_assign_pointer(nf_nat_sdp_hook, ip_nat_sdp);
return 0;
}
module_init(nf_nat_sip_init);
module_exit(nf_nat_sip_fini);
......@@ -236,6 +236,18 @@ config NF_CONNTRACK_PPTP
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_SIP
tristate "SIP protocol support (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
help
SIP is an application-layer control protocol that can establish,
modify, and terminate multimedia sessions (conferences) such as
Internet telephony calls. With the ip_conntrack_sip and
the nf_nat_sip modules you can support the protocol on a connection
tracking/NATing firewall.
To compile it as a module, choose M here. If unsure, say N.
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
......
......@@ -29,6 +29,7 @@ obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_conntrack_irc.o
obj-$(CONFIG_NF_CONNTRACK_NETBIOS_NS) += nf_conntrack_netbios_ns.o
obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_conntrack_pptp.o
obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
......
/* SIP extension for IP connection tracking.
*
* (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
* based on RR's ip_conntrack_ftp.c and other modules.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/skbuff.h>
#include <linux/inet.h>
#include <linux/in.h>
#include <linux/udp.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter/nf_conntrack_sip.h>
#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
MODULE_DESCRIPTION("SIP connection tracking helper");
MODULE_ALIAS("ip_conntrack_sip");
#define MAX_PORTS 8
static unsigned short ports[MAX_PORTS];
static int ports_c;
module_param_array(ports, ushort, &ports_c, 0400);
MODULE_PARM_DESC(ports, "port numbers of SIP servers");
static unsigned int sip_timeout __read_mostly = SIP_TIMEOUT;
module_param(sip_timeout, uint, 0600);
MODULE_PARM_DESC(sip_timeout, "timeout for the master SIP session");
unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conn *ct,
const char **dptr) __read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_sip_hook);
unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
struct nf_conntrack_expect *exp,
const char *dptr) __read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_sdp_hook);
static int digits_len(struct nf_conn *, const char *, const char *, int *);
static int epaddr_len(struct nf_conn *, const char *, const char *, int *);
static int skp_digits_len(struct nf_conn *, const char *, const char *, int *);
static int skp_epaddr_len(struct nf_conn *, const char *, const char *, int *);
struct sip_header_nfo {
const char *lname;
const char *sname;
const char *ln_str;
size_t lnlen;
size_t snlen;
size_t ln_strlen;
int case_sensitive;
int (*match_len)(struct nf_conn *, const char *,
const char *, int *);
};
static const struct sip_header_nfo ct_sip_hdrs[] = {
[POS_REG_REQ_URI] = { /* SIP REGISTER request URI */
.lname = "sip:",
.lnlen = sizeof("sip:") - 1,
.ln_str = ":",
.ln_strlen = sizeof(":") - 1,
.match_len = epaddr_len,
},
[POS_REQ_URI] = { /* SIP request URI */
.lname = "sip:",
.lnlen = sizeof("sip:") - 1,
.ln_str = "@",
.ln_strlen = sizeof("@") - 1,
.match_len = epaddr_len,
},
[POS_FROM] = { /* SIP From header */
.lname = "From:",
.lnlen = sizeof("From:") - 1,
.sname = "\r\nf:",
.snlen = sizeof("\r\nf:") - 1,
.ln_str = "sip:",
.ln_strlen = sizeof("sip:") - 1,
.match_len = skp_epaddr_len,
},
[POS_TO] = { /* SIP To header */
.lname = "To:",
.lnlen = sizeof("To:") - 1,
.sname = "\r\nt:",
.snlen = sizeof("\r\nt:") - 1,
.ln_str = "sip:",
.ln_strlen = sizeof("sip:") - 1,
.match_len = skp_epaddr_len
},
[POS_VIA] = { /* SIP Via header */
.lname = "Via:",
.lnlen = sizeof("Via:") - 1,
.sname = "\r\nv:",
.snlen = sizeof("\r\nv:") - 1, /* rfc3261 "\r\n" */
.ln_str = "UDP ",
.ln_strlen = sizeof("UDP ") - 1,
.match_len = epaddr_len,
},
[POS_CONTACT] = { /* SIP Contact header */
.lname = "Contact:",
.lnlen = sizeof("Contact:") - 1,
.sname = "\r\nm:",
.snlen = sizeof("\r\nm:") - 1,
.ln_str = "sip:",
.ln_strlen = sizeof("sip:") - 1,
.match_len = skp_epaddr_len
},
[POS_CONTENT] = { /* SIP Content length header */
.lname = "Content-Length:",
.lnlen = sizeof("Content-Length:") - 1,
.sname = "\r\nl:",
.snlen = sizeof("\r\nl:") - 1,
.ln_str = ":",
.ln_strlen = sizeof(":") - 1,
.match_len = skp_digits_len
},
[POS_MEDIA] = { /* SDP media info */
.case_sensitive = 1,
.lname = "\nm=",
.lnlen = sizeof("\nm=") - 1,
.sname = "\rm=",
.snlen = sizeof("\rm=") - 1,
.ln_str = "audio ",
.ln_strlen = sizeof("audio ") - 1,
.match_len = digits_len
},
[POS_OWNER_IP4] = { /* SDP owner address*/
.case_sensitive = 1,
.lname = "\no=",
.lnlen = sizeof("\no=") - 1,
.sname = "\ro=",
.snlen = sizeof("\ro=") - 1,
.ln_str = "IN IP4 ",
.ln_strlen = sizeof("IN IP4 ") - 1,
.match_len = epaddr_len
},
[POS_CONNECTION_IP4] = {/* SDP connection info */
.case_sensitive = 1,
.lname = "\nc=",
.lnlen = sizeof("\nc=") - 1,
.sname = "\rc=",
.snlen = sizeof("\rc=") - 1,
.ln_str = "IN IP4 ",
.ln_strlen = sizeof("IN IP4 ") - 1,
.match_len = epaddr_len
},
[POS_OWNER_IP6] = { /* SDP owner address*/
.case_sensitive = 1,
.lname = "\no=",
.lnlen = sizeof("\no=") - 1,
.sname = "\ro=",
.snlen = sizeof("\ro=") - 1,
.ln_str = "IN IP6 ",
.ln_strlen = sizeof("IN IP6 ") - 1,
.match_len = epaddr_len
},
[POS_CONNECTION_IP6] = {/* SDP connection info */
.case_sensitive = 1,
.lname = "\nc=",
.lnlen = sizeof("\nc=") - 1,
.sname = "\rc=",
.snlen = sizeof("\rc=") - 1,
.ln_str = "IN IP6 ",
.ln_strlen = sizeof("IN IP6 ") - 1,
.match_len = epaddr_len
},
[POS_SDP_HEADER] = { /* SDP version header */
.case_sensitive = 1,
.lname = "\nv=",
.lnlen = sizeof("\nv=") - 1,
.sname = "\rv=",
.snlen = sizeof("\rv=") - 1,
.ln_str = "=",
.ln_strlen = sizeof("=") - 1,
.match_len = digits_len
}
};
/* get line lenght until first CR or LF seen. */
int ct_sip_lnlen(const char *line, const char *limit)
{
const char *k = line;
while ((line <= limit) && (*line == '\r' || *line == '\n'))
line++;
while (line <= limit) {
if (*line == '\r' || *line == '\n')
break;
line++;
}
return line - k;
}
EXPORT_SYMBOL_GPL(ct_sip_lnlen);
/* Linear string search, case sensitive. */
const char *ct_sip_search(const char *needle, const char *haystack,
size_t needle_len, size_t haystack_len,
int case_sensitive)
{
const char *limit = haystack + (haystack_len - needle_len);
while (haystack <= limit) {
if (case_sensitive) {
if (strncmp(haystack, needle, needle_len) == 0)
return haystack;
} else {
if (strnicmp(haystack, needle, needle_len) == 0)
return haystack;
}
haystack++;
}
return NULL;
}
EXPORT_SYMBOL_GPL(ct_sip_search);
static int digits_len(struct nf_conn *ct, const char *dptr,
const char *limit, int *shift)
{
int len = 0;
while (dptr <= limit && isdigit(*dptr)) {
dptr++;
len++;
}
return len;
}
/* get digits lenght, skiping blank spaces. */
static int skp_digits_len(struct nf_conn *ct, const char *dptr,
const char *limit, int *shift)
{
for (; dptr <= limit && *dptr == ' '; dptr++)
(*shift)++;
return digits_len(ct, dptr, limit, shift);
}
static int parse_addr(struct nf_conn *ct, const char *cp, const char **endp,
union nf_conntrack_address *addr, const char *limit)
{
const char *end;
int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
int ret = 0;
switch (family) {
case AF_INET:
ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end);
break;
case AF_INET6:
ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end);
break;
default:
BUG();
}
if (ret == 0 || end == cp)
return 0;
if (endp)
*endp = end;
return 1;
}
/* skip ip address. returns its length. */
static int epaddr_len(struct nf_conn *ct, const char *dptr,
const char *limit, int *shift)
{
union nf_conntrack_address addr;
const char *aux = dptr;
if (!parse_addr(ct, dptr, &dptr, &addr, limit)) {
DEBUGP("ip: %s parse failed.!\n", dptr);
return 0;
}
/* Port number */
if (*dptr == ':') {
dptr++;
dptr += digits_len(ct, dptr, limit, shift);
}
return dptr - aux;
}
/* get address length, skiping user info. */
static int skp_epaddr_len(struct nf_conn *ct, const char *dptr,
const char *limit, int *shift)
{
int s = *shift;
for (; dptr <= limit && *dptr != '@'; dptr++)
(*shift)++;
if (*dptr == '@') {
dptr++;
(*shift)++;
} else
*shift = s;
return epaddr_len(ct, dptr, limit, shift);
}
/* Returns 0 if not found, -1 error parsing. */
int ct_sip_get_info(struct nf_conn *ct,
const char *dptr, size_t dlen,
unsigned int *matchoff,
unsigned int *matchlen,
enum sip_header_pos pos)
{
const struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos];
const char *limit, *aux, *k = dptr;
int shift = 0;
limit = dptr + (dlen - hnfo->lnlen);
while (dptr <= limit) {
if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) &&
(strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {
dptr++;
continue;
}
aux = ct_sip_search(hnfo->ln_str, dptr, hnfo->ln_strlen,
ct_sip_lnlen(dptr, limit),
hnfo->case_sensitive);
if (!aux) {
DEBUGP("'%s' not found in '%s'.\n", hnfo->ln_str,
hnfo->lname);
return -1;
}
aux += hnfo->ln_strlen;
*matchlen = hnfo->match_len(ct, aux, limit, &shift);
if (!*matchlen)
return -1;
*matchoff = (aux - k) + shift;
DEBUGP("%s match succeeded! - len: %u\n", hnfo->lname,
*matchlen);
return 1;
}
DEBUGP("%s header not found.\n", hnfo->lname);
return 0;
}
EXPORT_SYMBOL_GPL(ct_sip_get_info);
static int set_expected_rtp(struct sk_buff **pskb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
union nf_conntrack_address *addr,
__be16 port,
const char *dptr)
{
struct nf_conntrack_expect *exp;
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
int family = ct->tuplehash[!dir].tuple.src.l3num;
int ret;
typeof(nf_nat_sdp_hook) nf_nat_sdp;
exp = nf_conntrack_expect_alloc(ct);
if (exp == NULL)
return NF_DROP;
nf_conntrack_expect_init(exp, family,
&ct->tuplehash[!dir].tuple.src.u3, addr,
IPPROTO_UDP, NULL, &port);
nf_nat_sdp = rcu_dereference(nf_nat_sdp_hook);
if (nf_nat_sdp && ct->status & IPS_NAT_MASK)
ret = nf_nat_sdp(pskb, ctinfo, exp, dptr);
else {
if (nf_conntrack_expect_related(exp) != 0)
ret = NF_DROP;
else
ret = NF_ACCEPT;
}
nf_conntrack_expect_put(exp);
return ret;
}
static int sip_help(struct sk_buff **pskb,
unsigned int protoff,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo)
{
int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
union nf_conntrack_address addr;
unsigned int dataoff, datalen;
const char *dptr;
int ret = NF_ACCEPT;
int matchoff, matchlen;
u_int16_t port;
enum sip_header_pos pos;
typeof(nf_nat_sip_hook) nf_nat_sip;
/* No Data ? */
dataoff = protoff + sizeof(struct udphdr);
if (dataoff >= (*pskb)->len)
return NF_ACCEPT;
nf_ct_refresh(ct, *pskb, sip_timeout * HZ);
if (!skb_is_nonlinear(*pskb))
dptr = (*pskb)->data + dataoff;
else {
DEBUGP("Copy of skbuff not supported yet.\n");
goto out;
}
nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
if (nf_nat_sip && ct->status & IPS_NAT_MASK) {
if (!nf_nat_sip(pskb, ctinfo, ct, &dptr)) {
ret = NF_DROP;
goto out;
}
}
datalen = (*pskb)->len - dataoff;
if (datalen < sizeof("SIP/2.0 200") - 1)
goto out;
/* RTP info only in some SDP pkts */
if (memcmp(dptr, "INVITE", sizeof("INVITE") - 1) != 0 &&
memcmp(dptr, "SIP/2.0 200", sizeof("SIP/2.0 200") - 1) != 0) {
goto out;
}
/* Get address and port from SDP packet. */
pos = family == AF_INET ? POS_CONNECTION_IP4 : POS_CONNECTION_IP6;
if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, pos) > 0) {
/* We'll drop only if there are parse problems. */
if (!parse_addr(ct, dptr + matchoff, NULL, &addr,
dptr + datalen)) {
ret = NF_DROP;
goto out;
}
if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen,
POS_MEDIA) > 0) {
port = simple_strtoul(dptr + matchoff, NULL, 10);
if (port < 1024) {
ret = NF_DROP;
goto out;
}
ret = set_expected_rtp(pskb, ct, ctinfo, &addr,
htons(port), dptr);
}
}
out:
return ret;
}
static struct nf_conntrack_helper sip[MAX_PORTS][2] __read_mostly;
static char sip_names[MAX_PORTS][2][sizeof("sip-65535")] __read_mostly;
static void nf_conntrack_sip_fini(void)
{
int i, j;
for (i = 0; i < ports_c; i++) {
for (j = 0; j < 2; j++) {
if (sip[i][j].me == NULL)
continue;
nf_conntrack_helper_unregister(&sip[i][j]);
}
}
}
static int __init nf_conntrack_sip_init(void)
{
int i, j, ret;
char *tmpname;
if (ports_c == 0)
ports[ports_c++] = SIP_PORT;
for (i = 0; i < ports_c; i++) {
memset(&sip[i], 0, sizeof(sip[i]));
sip[i][0].tuple.src.l3num = AF_INET;
sip[i][1].tuple.src.l3num = AF_INET6;
for (j = 0; j < 2; j++) {
sip[i][j].tuple.dst.protonum = IPPROTO_UDP;
sip[i][j].tuple.src.u.udp.port = htons(ports[i]);
sip[i][j].mask.src.l3num = 0xFFFF;
sip[i][j].mask.src.u.udp.port = htons(0xFFFF);
sip[i][j].mask.dst.protonum = 0xFF;
sip[i][j].max_expected = 2;
sip[i][j].timeout = 3 * 60; /* 3 minutes */
sip[i][j].me = THIS_MODULE;
sip[i][j].help = sip_help;
tmpname = &sip_names[i][j][0];
if (ports[i] == SIP_PORT)
sprintf(tmpname, "sip");
else
sprintf(tmpname, "sip-%u", i);
sip[i][j].name = tmpname;
DEBUGP("port #%u: %u\n", i, ports[i]);
ret = nf_conntrack_helper_register(&sip[i][j]);
if (ret) {
printk("nf_ct_sip: failed to register helper "
"for pf: %u port: %u\n",
sip[i][j].tuple.src.l3num, ports[i]);
nf_conntrack_sip_fini();
return ret;
}
}
}
return 0;
}
module_init(nf_conntrack_sip_init);
module_exit(nf_conntrack_sip_fini);
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