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authorPatrick McHardy <kaber@trash.net>2012-08-26 19:14:25 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2012-08-30 03:00:22 +0200
commit9a664821068739dbc8eac13770e28167b46a0c0f (patch)
treedf7921b2a21c92442fb9021688006f09e5e3bebd /net/ipv4
parentee6eb96673704225164f0ba7462e1973ce10885c (diff)
downloadop-kernel-dev-9a664821068739dbc8eac13770e28167b46a0c0f.zip
op-kernel-dev-9a664821068739dbc8eac13770e28167b46a0c0f.tar.gz
netfilter: nf_nat: support IPv6 in SIP NAT helper
Add IPv6 support to the SIP NAT helper. There are no functional differences to IPv4 NAT, just different formats for addresses. Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/Kconfig5
-rw-r--r--net/ipv4/netfilter/Makefile1
-rw-r--r--net/ipv4/netfilter/nf_nat_sip.c580
3 files changed, 0 insertions, 586 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 52c4a87..30197f8 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -242,11 +242,6 @@ config NF_NAT_H323
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_H323
-config NF_NAT_SIP
- tristate
- depends on NF_CONNTRACK && NF_NAT_IPV4
- default NF_NAT_IPV4 && NF_CONNTRACK_SIP
-
# mangle + specific targets
config IP_NF_MANGLE
tristate "Packet mangling"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 8baa496..8914abf 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -23,7 +23,6 @@ obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
obj-$(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-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
diff --git a/net/ipv4/netfilter/nf_nat_sip.c b/net/ipv4/netfilter/nf_nat_sip.c
deleted file mode 100644
index 47a4718..0000000
--- a/net/ipv4/netfilter/nf_nat_sip.c
+++ /dev/null
@@ -1,580 +0,0 @@
-/* SIP extension for NAT alteration.
- *
- * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
- * based on RR's ip_nat_ftp.c and other modules.
- * (C) 2007 United Security Providers
- * (C) 2007, 2008 Patrick McHardy <kaber@trash.net>
- *
- * 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 <net/ip.h>
-#include <linux/udp.h>
-#include <linux/tcp.h>
-
-#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_helper.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");
-
-
-static unsigned int mangle_packet(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- unsigned int matchoff, unsigned int matchlen,
- const char *buffer, unsigned int buflen)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- struct tcphdr *th;
- unsigned int baseoff;
-
- if (nf_ct_protonum(ct) == IPPROTO_TCP) {
- th = (struct tcphdr *)(skb->data + ip_hdrlen(skb));
- baseoff = ip_hdrlen(skb) + th->doff * 4;
- matchoff += dataoff - baseoff;
-
- if (!__nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
- protoff, matchoff, matchlen,
- buffer, buflen, false))
- return 0;
- } else {
- baseoff = ip_hdrlen(skb) + sizeof(struct udphdr);
- matchoff += dataoff - baseoff;
-
- if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo,
- protoff, matchoff, matchlen,
- buffer, buflen))
- return 0;
- }
-
- /* Reload data pointer and adjust datalen value */
- *dptr = skb->data + dataoff;
- *datalen += buflen - matchlen;
- return 1;
-}
-
-static int map_addr(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- unsigned int matchoff, unsigned int matchlen,
- union nf_inet_addr *addr, __be16 port)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
- unsigned int buflen;
- __be32 newaddr;
- __be16 newport;
-
- if (ct->tuplehash[dir].tuple.src.u3.ip == addr->ip &&
- ct->tuplehash[dir].tuple.src.u.udp.port == port) {
- newaddr = ct->tuplehash[!dir].tuple.dst.u3.ip;
- newport = ct->tuplehash[!dir].tuple.dst.u.udp.port;
- } else if (ct->tuplehash[dir].tuple.dst.u3.ip == addr->ip &&
- ct->tuplehash[dir].tuple.dst.u.udp.port == port) {
- newaddr = ct->tuplehash[!dir].tuple.src.u3.ip;
- newport = ct->tuplehash[!dir].tuple.src.u.udp.port;
- } else
- return 1;
-
- if (newaddr == addr->ip && newport == port)
- return 1;
-
- buflen = sprintf(buffer, "%pI4:%u", &newaddr, ntohs(newport));
-
- return mangle_packet(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, buffer, buflen);
-}
-
-static int map_sip_addr(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- enum sip_header_types type)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- unsigned int matchlen, matchoff;
- union nf_inet_addr addr;
- __be16 port;
-
- if (ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen, type, NULL,
- &matchoff, &matchlen, &addr, &port) <= 0)
- return 1;
- return map_addr(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, &addr, port);
-}
-
-static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- unsigned int coff, matchoff, matchlen;
- enum sip_header_types hdr;
- union nf_inet_addr addr;
- __be16 port;
- int request, in_header;
-
- /* Basic rules: requests and responses. */
- if (strnicmp(*dptr, "SIP/2.0", strlen("SIP/2.0")) != 0) {
- if (ct_sip_parse_request(ct, *dptr, *datalen,
- &matchoff, &matchlen,
- &addr, &port) > 0 &&
- !map_addr(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, &addr, port))
- return NF_DROP;
- request = 1;
- } else
- request = 0;
-
- if (nf_ct_protonum(ct) == IPPROTO_TCP)
- hdr = SIP_HDR_VIA_TCP;
- else
- hdr = SIP_HDR_VIA_UDP;
-
- /* Translate topmost Via header and parameters */
- if (ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen,
- hdr, NULL, &matchoff, &matchlen,
- &addr, &port) > 0) {
- unsigned int olen, matchend, poff, plen, buflen, n;
- char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
-
- /* We're only interested in headers related to this
- * connection */
- if (request) {
- if (addr.ip != ct->tuplehash[dir].tuple.src.u3.ip ||
- port != ct->tuplehash[dir].tuple.src.u.udp.port)
- goto next;
- } else {
- if (addr.ip != ct->tuplehash[dir].tuple.dst.u3.ip ||
- port != ct->tuplehash[dir].tuple.dst.u.udp.port)
- goto next;
- }
-
- olen = *datalen;
- if (!map_addr(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, &addr, port))
- return NF_DROP;
-
- matchend = matchoff + matchlen + *datalen - olen;
-
- /* The maddr= parameter (RFC 2361) specifies where to send
- * the reply. */
- if (ct_sip_parse_address_param(ct, *dptr, matchend, *datalen,
- "maddr=", &poff, &plen,
- &addr, true) > 0 &&
- addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
- addr.ip != ct->tuplehash[!dir].tuple.dst.u3.ip) {
- buflen = sprintf(buffer, "%pI4",
- &ct->tuplehash[!dir].tuple.dst.u3.ip);
- if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
- poff, plen, buffer, buflen))
- return NF_DROP;
- }
-
- /* The received= parameter (RFC 2361) contains the address
- * from which the server received the request. */
- if (ct_sip_parse_address_param(ct, *dptr, matchend, *datalen,
- "received=", &poff, &plen,
- &addr, false) > 0 &&
- addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
- addr.ip != ct->tuplehash[!dir].tuple.src.u3.ip) {
- buflen = sprintf(buffer, "%pI4",
- &ct->tuplehash[!dir].tuple.src.u3.ip);
- if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
- poff, plen, buffer, buflen))
- return NF_DROP;
- }
-
- /* The rport= parameter (RFC 3581) contains the port number
- * from which the server received the request. */
- if (ct_sip_parse_numerical_param(ct, *dptr, matchend, *datalen,
- "rport=", &poff, &plen,
- &n) > 0 &&
- htons(n) == ct->tuplehash[dir].tuple.dst.u.udp.port &&
- htons(n) != ct->tuplehash[!dir].tuple.src.u.udp.port) {
- __be16 p = ct->tuplehash[!dir].tuple.src.u.udp.port;
- buflen = sprintf(buffer, "%u", ntohs(p));
- if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
- poff, plen, buffer, buflen))
- return NF_DROP;
- }
- }
-
-next:
- /* Translate Contact headers */
- coff = 0;
- in_header = 0;
- while (ct_sip_parse_header_uri(ct, *dptr, &coff, *datalen,
- SIP_HDR_CONTACT, &in_header,
- &matchoff, &matchlen,
- &addr, &port) > 0) {
- if (!map_addr(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen,
- &addr, port))
- return NF_DROP;
- }
-
- if (!map_sip_addr(skb, protoff, dataoff, dptr, datalen, SIP_HDR_FROM) ||
- !map_sip_addr(skb, protoff, dataoff, dptr, datalen, SIP_HDR_TO))
- return NF_DROP;
-
- return NF_ACCEPT;
-}
-
-static void ip_nat_sip_seq_adjust(struct sk_buff *skb, s16 off)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- const struct tcphdr *th;
-
- if (nf_ct_protonum(ct) != IPPROTO_TCP || off == 0)
- return;
-
- th = (struct tcphdr *)(skb->data + ip_hdrlen(skb));
- nf_nat_set_seq_adjust(ct, ctinfo, th->seq, off);
-}
-
-/* Handles expected signalling connections and media streams */
-static void ip_nat_sip_expected(struct nf_conn *ct,
- struct nf_conntrack_expect *exp)
-{
- struct nf_nat_range range;
-
- /* This must be a fresh one. */
- BUG_ON(ct->status & IPS_NAT_DONE_MASK);
-
- /* For DST manip, map port here to where it's expected. */
- range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
- range.min_proto = range.max_proto = exp->saved_proto;
- range.min_addr = range.max_addr = exp->saved_addr;
- nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
-
- /* Change src to where master sends to, but only if the connection
- * actually came from the same source. */
- if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip ==
- ct->master->tuplehash[exp->dir].tuple.src.u3.ip) {
- range.flags = NF_NAT_RANGE_MAP_IPS;
- range.min_addr = range.max_addr
- = ct->master->tuplehash[!exp->dir].tuple.dst.u3;
- nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
- }
-}
-
-static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- struct nf_conntrack_expect *exp,
- unsigned int matchoff,
- unsigned int matchlen)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- __be32 newip;
- u_int16_t port;
- char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
- unsigned int buflen;
-
- /* Connection will come from reply */
- if (ct->tuplehash[dir].tuple.src.u3.ip == ct->tuplehash[!dir].tuple.dst.u3.ip)
- newip = exp->tuple.dst.u3.ip;
- else
- newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
-
- /* If the signalling port matches the connection's source port in the
- * original direction, try to use the destination port in the opposite
- * direction. */
- if (exp->tuple.dst.u.udp.port ==
- ct->tuplehash[dir].tuple.src.u.udp.port)
- port = ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.port);
- else
- port = ntohs(exp->tuple.dst.u.udp.port);
-
- exp->saved_addr = exp->tuple.dst.u3;
- exp->tuple.dst.u3.ip = newip;
- exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
- exp->dir = !dir;
- exp->expectfn = ip_nat_sip_expected;
-
- for (; port != 0; port++) {
- int ret;
-
- exp->tuple.dst.u.udp.port = htons(port);
- ret = nf_ct_expect_related(exp);
- if (ret == 0)
- break;
- else if (ret != -EBUSY) {
- port = 0;
- break;
- }
- }
-
- if (port == 0)
- return NF_DROP;
-
- if (exp->tuple.dst.u3.ip != exp->saved_addr.ip ||
- exp->tuple.dst.u.udp.port != exp->saved_proto.udp.port) {
- buflen = sprintf(buffer, "%pI4:%u", &newip, port);
- if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, buffer, buflen))
- goto err;
- }
- return NF_ACCEPT;
-
-err:
- nf_ct_unexpect_related(exp);
- return NF_DROP;
-}
-
-static int mangle_content_len(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- unsigned int matchoff, matchlen;
- char buffer[sizeof("65536")];
- int buflen, c_len;
-
- /* Get actual SDP length */
- if (ct_sip_get_sdp_header(ct, *dptr, 0, *datalen,
- SDP_HDR_VERSION, SDP_HDR_UNSPEC,
- &matchoff, &matchlen) <= 0)
- return 0;
- c_len = *datalen - matchoff + strlen("v=");
-
- /* Now, update SDP length */
- if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CONTENT_LENGTH,
- &matchoff, &matchlen) <= 0)
- return 0;
-
- buflen = sprintf(buffer, "%u", c_len);
- return mangle_packet(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, buffer, buflen);
-}
-
-static int mangle_sdp_packet(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- unsigned int sdpoff,
- enum sdp_header_types type,
- enum sdp_header_types term,
- char *buffer, int buflen)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- unsigned int matchlen, matchoff;
-
- if (ct_sip_get_sdp_header(ct, *dptr, sdpoff, *datalen, type, term,
- &matchoff, &matchlen) <= 0)
- return -ENOENT;
- return mangle_packet(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, buffer, buflen) ? 0 : -EINVAL;
-}
-
-static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- unsigned int sdpoff,
- enum sdp_header_types type,
- enum sdp_header_types term,
- const union nf_inet_addr *addr)
-{
- char buffer[sizeof("nnn.nnn.nnn.nnn")];
- unsigned int buflen;
-
- buflen = sprintf(buffer, "%pI4", &addr->ip);
- if (mangle_sdp_packet(skb, protoff, dataoff, dptr, datalen,
- sdpoff, type, term, buffer, buflen))
- return 0;
-
- return mangle_content_len(skb, protoff, dataoff, dptr, datalen);
-}
-
-static unsigned int ip_nat_sdp_port(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- unsigned int matchoff,
- unsigned int matchlen,
- u_int16_t port)
-{
- char buffer[sizeof("nnnnn")];
- unsigned int buflen;
-
- buflen = sprintf(buffer, "%u", port);
- if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
- matchoff, matchlen, buffer, buflen))
- return 0;
-
- return mangle_content_len(skb, protoff, dataoff, dptr, datalen);
-}
-
-static unsigned int ip_nat_sdp_session(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- unsigned int sdpoff,
- const union nf_inet_addr *addr)
-{
- char buffer[sizeof("nnn.nnn.nnn.nnn")];
- unsigned int buflen;
-
- /* Mangle session description owner and contact addresses */
- buflen = sprintf(buffer, "%pI4", &addr->ip);
- if (mangle_sdp_packet(skb, protoff, dataoff, dptr, datalen, sdpoff,
- SDP_HDR_OWNER_IP4, SDP_HDR_MEDIA,
- buffer, buflen))
- return 0;
-
- switch (mangle_sdp_packet(skb, protoff, dataoff, dptr, datalen, sdpoff,
- SDP_HDR_CONNECTION_IP4, SDP_HDR_MEDIA,
- buffer, buflen)) {
- case 0:
- /*
- * RFC 2327:
- *
- * Session description
- *
- * c=* (connection information - not required if included in all media)
- */
- case -ENOENT:
- break;
- default:
- return 0;
- }
-
- return mangle_content_len(skb, protoff, dataoff, dptr, datalen);
-}
-
-/* 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_media(struct sk_buff *skb, unsigned int protoff,
- unsigned int dataoff,
- const char **dptr, unsigned int *datalen,
- struct nf_conntrack_expect *rtp_exp,
- struct nf_conntrack_expect *rtcp_exp,
- unsigned int mediaoff,
- unsigned int medialen,
- union nf_inet_addr *rtp_addr)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- u_int16_t port;
-
- /* Connection will come from reply */
- if (ct->tuplehash[dir].tuple.src.u3.ip ==
- ct->tuplehash[!dir].tuple.dst.u3.ip)
- rtp_addr->ip = rtp_exp->tuple.dst.u3.ip;
- else
- rtp_addr->ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
-
- rtp_exp->saved_addr = rtp_exp->tuple.dst.u3;
- rtp_exp->tuple.dst.u3.ip = rtp_addr->ip;
- rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
- rtp_exp->dir = !dir;
- rtp_exp->expectfn = ip_nat_sip_expected;
-
- rtcp_exp->saved_addr = rtcp_exp->tuple.dst.u3;
- rtcp_exp->tuple.dst.u3.ip = rtp_addr->ip;
- rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
- rtcp_exp->dir = !dir;
- rtcp_exp->expectfn = ip_nat_sip_expected;
-
- /* Try to get same pair of ports: if not, try to change them. */
- for (port = ntohs(rtp_exp->tuple.dst.u.udp.port);
- port != 0; port += 2) {
- int ret;
-
- rtp_exp->tuple.dst.u.udp.port = htons(port);
- ret = nf_ct_expect_related(rtp_exp);
- if (ret == -EBUSY)
- continue;
- else if (ret < 0) {
- port = 0;
- break;
- }
- rtcp_exp->tuple.dst.u.udp.port = htons(port + 1);
- ret = nf_ct_expect_related(rtcp_exp);
- if (ret == 0)
- break;
- else if (ret != -EBUSY) {
- nf_ct_unexpect_related(rtp_exp);
- port = 0;
- break;
- }
- }
-
- if (port == 0)
- goto err1;
-
- /* Update media port. */
- if (rtp_exp->tuple.dst.u.udp.port != rtp_exp->saved_proto.udp.port &&
- !ip_nat_sdp_port(skb, protoff, dataoff, dptr, datalen,
- mediaoff, medialen, port))
- goto err2;
-
- return NF_ACCEPT;
-
-err2:
- nf_ct_unexpect_related(rtp_exp);
- nf_ct_unexpect_related(rtcp_exp);
-err1:
- return NF_DROP;
-}
-
-static struct nf_ct_helper_expectfn sip_nat = {
- .name = "sip",
- .expectfn = ip_nat_sip_expected,
-};
-
-static void __exit nf_nat_sip_fini(void)
-{
- RCU_INIT_POINTER(nf_nat_sip_hook, NULL);
- RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, NULL);
- RCU_INIT_POINTER(nf_nat_sip_expect_hook, NULL);
- RCU_INIT_POINTER(nf_nat_sdp_addr_hook, NULL);
- RCU_INIT_POINTER(nf_nat_sdp_port_hook, NULL);
- RCU_INIT_POINTER(nf_nat_sdp_session_hook, NULL);
- RCU_INIT_POINTER(nf_nat_sdp_media_hook, NULL);
- nf_ct_helper_expectfn_unregister(&sip_nat);
- synchronize_rcu();
-}
-
-static int __init nf_nat_sip_init(void)
-{
- BUG_ON(nf_nat_sip_hook != NULL);
- BUG_ON(nf_nat_sip_seq_adjust_hook != NULL);
- BUG_ON(nf_nat_sip_expect_hook != NULL);
- BUG_ON(nf_nat_sdp_addr_hook != NULL);
- BUG_ON(nf_nat_sdp_port_hook != NULL);
- BUG_ON(nf_nat_sdp_session_hook != NULL);
- BUG_ON(nf_nat_sdp_media_hook != NULL);
- RCU_INIT_POINTER(nf_nat_sip_hook, ip_nat_sip);
- RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, ip_nat_sip_seq_adjust);
- RCU_INIT_POINTER(nf_nat_sip_expect_hook, ip_nat_sip_expect);
- RCU_INIT_POINTER(nf_nat_sdp_addr_hook, ip_nat_sdp_addr);
- RCU_INIT_POINTER(nf_nat_sdp_port_hook, ip_nat_sdp_port);
- RCU_INIT_POINTER(nf_nat_sdp_session_hook, ip_nat_sdp_session);
- RCU_INIT_POINTER(nf_nat_sdp_media_hook, ip_nat_sdp_media);
- nf_ct_helper_expectfn_register(&sip_nat);
- return 0;
-}
-
-module_init(nf_nat_sip_init);
-module_exit(nf_nat_sip_fini);
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