// SPDX-License-Identifier: GPL-2.0-only /* * H.323 connection tracking helper * * Copyright (c) 2006 Jing Min Zhao <[email protected]> * Copyright (c) 2006-2012 Patrick McHardy <[email protected]> * * Based on the 'brute force' H.323 connection tracking module by * Jozsef Kadlecsik <[email protected]> * * For more information, please see http://nath323.sourceforge.net/ */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/ctype.h> #include <linux/inet.h> #include <linux/in.h> #include <linux/ip.h> #include <linux/slab.h> #include <linux/udp.h> #include <linux/tcp.h> #include <linux/skbuff.h> #include <net/route.h> #include <net/ip6_route.h> #include <linux/netfilter_ipv6.h> #include <net/netfilter/nf_conntrack.h> #include <net/netfilter/nf_conntrack_core.h> #include <net/netfilter/nf_conntrack_tuple.h> #include <net/netfilter/nf_conntrack_expect.h> #include <net/netfilter/nf_conntrack_ecache.h> #include <net/netfilter/nf_conntrack_helper.h> #include <net/netfilter/nf_conntrack_zones.h> #include <linux/netfilter/nf_conntrack_h323.h> #define H323_MAX_SIZE … /* Parameters */ static unsigned int default_rrq_ttl __read_mostly = …; module_param(default_rrq_ttl, uint, 0600); MODULE_PARM_DESC(…) …; static int gkrouted_only __read_mostly = …; module_param(gkrouted_only, int, 0600); MODULE_PARM_DESC(…) …; static bool callforward_filter __read_mostly = …; module_param(callforward_filter, bool, 0600); MODULE_PARM_DESC(…) …; const struct nfct_h323_nat_hooks __rcu *nfct_h323_nat_hook __read_mostly; EXPORT_SYMBOL_GPL(…); static DEFINE_SPINLOCK(nf_h323_lock); static char *h323_buffer; static struct nf_conntrack_helper nf_conntrack_helper_h245; static struct nf_conntrack_helper nf_conntrack_helper_q931[]; static struct nf_conntrack_helper nf_conntrack_helper_ras[]; static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned char **data, int *datalen, int *dataoff) { … } static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, H245_TransportAddress *taddr, union nf_inet_addr *addr, __be16 *port) { … } static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, H245_TransportAddress *taddr) { … } static int expect_t120(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, H245_TransportAddress *taddr) { … } static int process_h245_channel(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, H2250LogicalChannelParameters *channel) { … } static int process_olc(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, OpenLogicalChannel *olc) { … } static int process_olca(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, OpenLogicalChannelAck *olca) { … } static int process_h245(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, MultimediaSystemControlMessage *mscm) { … } static int h245_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { … } static const struct nf_conntrack_expect_policy h245_exp_policy = …; static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = …; int get_h225_addr(struct nf_conn *ct, unsigned char *data, TransportAddress *taddr, union nf_inet_addr *addr, __be16 *port) { … } EXPORT_SYMBOL_GPL(…); static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, TransportAddress *taddr) { … } /* If the calling party is on the same side of the forward-to party, * we don't need to track the second call */ static int callforward_do_filter(struct net *net, const union nf_inet_addr *src, const union nf_inet_addr *dst, u_int8_t family) { … } static int expect_callforwarding(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, TransportAddress *taddr) { … } static int process_setup(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, Setup_UUIE *setup) { … } static int process_callproceeding(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, CallProceeding_UUIE *callproc) { … } static int process_connect(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, Connect_UUIE *connect) { … } static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, Alerting_UUIE *alert) { … } static int process_facility(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, Facility_UUIE *facility) { … } static int process_progress(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, Progress_UUIE *progress) { … } static int process_q931(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, int dataoff, Q931 *q931) { … } static int q931_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { … } static const struct nf_conntrack_expect_policy q931_exp_policy = …; static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = …; static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, int *datalen) { … } static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, union nf_inet_addr *addr, __be16 port) { … } static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, TransportAddress *taddr, int count) { … } static int process_grq(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, GatekeeperRequest *grq) { … } static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, GatekeeperConfirm *gcf) { … } static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, RegistrationRequest *rrq) { … } static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, RegistrationConfirm *rcf) { … } static int process_urq(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, UnregistrationRequest *urq) { … } static int process_arq(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, AdmissionRequest *arq) { … } static int process_acf(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, AdmissionConfirm *acf) { … } static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, LocationRequest *lrq) { … } static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, LocationConfirm *lcf) { … } static int process_irr(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, InfoRequestResponse *irr) { … } static int process_ras(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned char **data, RasMessage *ras) { … } static int ras_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { … } static const struct nf_conntrack_expect_policy ras_exp_policy = …; static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = …; static int __init h323_helper_init(void) { … } static void __exit h323_helper_exit(void) { … } static void __exit nf_conntrack_h323_fini(void) { … } static int __init nf_conntrack_h323_init(void) { … } module_init(…) …; module_exit(nf_conntrack_h323_fini); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …; MODULE_ALIAS_NFCT_HELPER(…) …; MODULE_ALIAS_NFCT_HELPER(…) …; MODULE_ALIAS_NFCT_HELPER(…) …;
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