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![Patrick McHardy](/assets/img/avatar_default.png)
The H.245 helper is not registered/unregistered, but assigned to connections manually from the Q.931 helper. This means on unload existing expectations and connections using the helper are not cleaned up, leading to the following oops on module unload: CPU 0 Unable to handle kernel paging request at virtual address c00a6828, epc == 802224dc, ra == 801d4e7c Oops[#1]: Cpu 0 $ 0 : 00000000 00000000 00000004 c00a67f0 $ 4 : 802a5ad0 81657e00 00000000 00000000 $ 8 : 00000008 801461c8 00000000 80570050 $12 : 819b0280 819b04b0 00000006 00000000 $16 : 802a5a60 80000000 80b46000 80321010 $20 : 00000000 00000004 802a5ad0 00000001 $24 : 00000000 802257a8 $28 : 802a4000 802a59e8 00000004 801d4e7c Hi : 0000000b Lo : 00506320 epc : 802224dc ip_conntrack_help+0x38/0x74 Tainted: P ra : 801d4e7c nf_iterate+0xbc/0x130 Status: 1000f403 KERNEL EXL IE Cause : 00800008 BadVA : c00a6828 PrId : 00019374 Modules linked in: ip_nat_pptp ip_conntrack_pptp ath_pktlog wlan_acl wlan_wep wlan_tkip wlan_ccmp wlan_xauth ath_pci ath_dev ath_dfs ath_rate_atheros wlan ath_hal ip_nat_tftp ip_conntrack_tftp ip_nat_ftp ip_conntrack_ftp pppoe ppp_async ppp_deflate ppp_mppe pppox ppp_generic slhc Process swapper (pid: 0, threadinfo=802a4000, task=802a6000) Stack : 801e7d98 00000004 802a5a60 80000000 801d4e7c 801d4e7c 802a5ad0 00000004 00000000 00000000 801e7d98 00000000 00000004 802a5ad0 00000000 00000010 801e7d98 80b46000 802a5a60 80320000 80000000 801d4f8c 802a5b00 00000002 80063834 00000000 80b46000 802a5a60 801e7d98 80000000 802ba854 00000000 81a02180 80b7e260 81a021b0 819b0000 819b0000 80570056 00000000 00000001 ... Call Trace: [<801e7d98>] ip_finish_output+0x0/0x23c [<801d4e7c>] nf_iterate+0xbc/0x130 [<801d4e7c>] nf_iterate+0xbc/0x130 [<801e7d98>] ip_finish_output+0x0/0x23c [<801e7d98>] ip_finish_output+0x0/0x23c [<801d4f8c>] nf_hook_slow+0x9c/0x1a4 One way to fix this would be to split helper cleanup from the unregistration function and invoke it for the H.245 helper, but since ctnetlink needs to be able to find the helper for synchonization purposes, a better fix is to register it normally and make sure its not assigned to connections during helper lookup. The missing l3num initialization is enough for this, this patch changes it to use AF_UNSPEC to make it more explicit though. Reported-by: liannan <liannan@twsz.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1831 lines
52 KiB
C
1831 lines
52 KiB
C
/*
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* H.323 connection tracking helper
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*
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* Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
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*
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* This source code is licensed under General Public License version 2.
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*
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* Based on the 'brute force' H.323 connection tracking module by
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* Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* For more information, please see http://nath323.sourceforge.net/
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ctype.h>
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#include <linux/inet.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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#include <linux/skbuff.h>
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#include <net/route.h>
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#include <net/ip6_route.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_ecache.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <linux/netfilter/nf_conntrack_h323.h>
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/* Parameters */
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static unsigned int default_rrq_ttl __read_mostly = 300;
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module_param(default_rrq_ttl, uint, 0600);
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MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
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static int gkrouted_only __read_mostly = 1;
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module_param(gkrouted_only, int, 0600);
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MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
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static int callforward_filter __read_mostly = 1;
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module_param(callforward_filter, bool, 0600);
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MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
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"if both endpoints are on different sides "
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"(determined by routing information)");
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/* Hooks for NAT */
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int (*set_h245_addr_hook) (struct sk_buff *skb,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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union nf_inet_addr *addr, __be16 port)
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__read_mostly;
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int (*set_h225_addr_hook) (struct sk_buff *skb,
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unsigned char **data, int dataoff,
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TransportAddress *taddr,
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union nf_inet_addr *addr, __be16 port)
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__read_mostly;
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int (*set_sig_addr_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress *taddr, int count) __read_mostly;
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int (*set_ras_addr_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress *taddr, int count) __read_mostly;
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int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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__be16 port, __be16 rtp_port,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp) __read_mostly;
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int (*nat_t120_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp) __read_mostly;
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int (*nat_h245_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp) __read_mostly;
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int (*nat_callforwarding_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp) __read_mostly;
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int (*nat_q931_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, TransportAddress *taddr, int idx,
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__be16 port, struct nf_conntrack_expect *exp)
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__read_mostly;
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static DEFINE_SPINLOCK(nf_h323_lock);
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static char *h323_buffer;
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static struct nf_conntrack_helper nf_conntrack_helper_h245;
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static struct nf_conntrack_helper nf_conntrack_helper_q931[];
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static struct nf_conntrack_helper nf_conntrack_helper_ras[];
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/****************************************************************************/
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static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct, enum ip_conntrack_info ctinfo,
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unsigned char **data, int *datalen, int *dataoff)
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{
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struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
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int dir = CTINFO2DIR(ctinfo);
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const struct tcphdr *th;
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struct tcphdr _tcph;
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int tcpdatalen;
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int tcpdataoff;
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unsigned char *tpkt;
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int tpktlen;
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int tpktoff;
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/* Get TCP header */
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th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
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if (th == NULL)
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return 0;
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/* Get TCP data offset */
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tcpdataoff = protoff + th->doff * 4;
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/* Get TCP data length */
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tcpdatalen = skb->len - tcpdataoff;
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if (tcpdatalen <= 0) /* No TCP data */
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goto clear_out;
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if (*data == NULL) { /* first TPKT */
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/* Get first TPKT pointer */
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tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
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h323_buffer);
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BUG_ON(tpkt == NULL);
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/* Validate TPKT identifier */
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if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
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/* Netmeeting sends TPKT header and data separately */
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if (info->tpkt_len[dir] > 0) {
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pr_debug("nf_ct_h323: previous packet "
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"indicated separate TPKT data of %hu "
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"bytes\n", info->tpkt_len[dir]);
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if (info->tpkt_len[dir] <= tcpdatalen) {
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/* Yes, there was a TPKT header
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* received */
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*data = tpkt;
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*datalen = info->tpkt_len[dir];
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*dataoff = 0;
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goto out;
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}
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/* Fragmented TPKT */
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pr_debug("nf_ct_h323: fragmented TPKT\n");
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goto clear_out;
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}
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/* It is not even a TPKT */
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return 0;
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}
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tpktoff = 0;
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} else { /* Next TPKT */
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tpktoff = *dataoff + *datalen;
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tcpdatalen -= tpktoff;
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if (tcpdatalen <= 4) /* No more TPKT */
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goto clear_out;
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tpkt = *data + *datalen;
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/* Validate TPKT identifier */
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if (tpkt[0] != 0x03 || tpkt[1] != 0)
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goto clear_out;
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}
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/* Validate TPKT length */
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tpktlen = tpkt[2] * 256 + tpkt[3];
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if (tpktlen < 4)
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goto clear_out;
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if (tpktlen > tcpdatalen) {
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if (tcpdatalen == 4) { /* Separate TPKT header */
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/* Netmeeting sends TPKT header and data separately */
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pr_debug("nf_ct_h323: separate TPKT header indicates "
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"there will be TPKT data of %hu bytes\n",
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tpktlen - 4);
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info->tpkt_len[dir] = tpktlen - 4;
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return 0;
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}
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if (net_ratelimit())
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printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
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goto clear_out;
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}
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/* This is the encapsulated data */
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*data = tpkt + 4;
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*datalen = tpktlen - 4;
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*dataoff = tpktoff + 4;
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out:
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/* Clear TPKT length */
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info->tpkt_len[dir] = 0;
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return 1;
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clear_out:
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info->tpkt_len[dir] = 0;
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return 0;
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}
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/****************************************************************************/
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static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
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H245_TransportAddress *taddr,
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union nf_inet_addr *addr, __be16 *port)
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{
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const unsigned char *p;
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int len;
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if (taddr->choice != eH245_TransportAddress_unicastAddress)
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return 0;
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switch (taddr->unicastAddress.choice) {
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case eUnicastAddress_iPAddress:
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if (nf_ct_l3num(ct) != AF_INET)
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return 0;
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p = data + taddr->unicastAddress.iPAddress.network;
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len = 4;
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break;
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case eUnicastAddress_iP6Address:
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if (nf_ct_l3num(ct) != AF_INET6)
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return 0;
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p = data + taddr->unicastAddress.iP6Address.network;
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len = 16;
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break;
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default:
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return 0;
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}
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memcpy(addr, p, len);
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memset((void *)addr + len, 0, sizeof(*addr) - len);
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memcpy(port, p + len, sizeof(__be16));
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return 1;
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}
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/****************************************************************************/
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static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr)
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{
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int dir = CTINFO2DIR(ctinfo);
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int ret = 0;
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__be16 port;
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__be16 rtp_port, rtcp_port;
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union nf_inet_addr addr;
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struct nf_conntrack_expect *rtp_exp;
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struct nf_conntrack_expect *rtcp_exp;
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typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
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/* Read RTP or RTCP address */
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if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
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memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
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port == 0)
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return 0;
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/* RTP port is even */
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port &= htons(~1);
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rtp_port = port;
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rtcp_port = htons(ntohs(port) + 1);
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/* Create expect for RTP */
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if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
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return -1;
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nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
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&ct->tuplehash[!dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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IPPROTO_UDP, NULL, &rtp_port);
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/* Create expect for RTCP */
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if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
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nf_ct_expect_put(rtp_exp);
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return -1;
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}
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nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
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&ct->tuplehash[!dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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IPPROTO_UDP, NULL, &rtcp_port);
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if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
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(nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
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ct->status & IPS_NAT_MASK) {
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/* NAT needed */
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ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
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taddr, port, rtp_port, rtp_exp, rtcp_exp);
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} else { /* Conntrack only */
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if (nf_ct_expect_related(rtp_exp) == 0) {
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if (nf_ct_expect_related(rtcp_exp) == 0) {
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pr_debug("nf_ct_h323: expect RTP ");
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nf_ct_dump_tuple(&rtp_exp->tuple);
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pr_debug("nf_ct_h323: expect RTCP ");
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nf_ct_dump_tuple(&rtcp_exp->tuple);
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} else {
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nf_ct_unexpect_related(rtp_exp);
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ret = -1;
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}
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} else
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ret = -1;
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}
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nf_ct_expect_put(rtp_exp);
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nf_ct_expect_put(rtcp_exp);
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return ret;
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}
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/****************************************************************************/
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static int expect_t120(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr)
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{
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int dir = CTINFO2DIR(ctinfo);
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int ret = 0;
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__be16 port;
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union nf_inet_addr addr;
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struct nf_conntrack_expect *exp;
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typeof(nat_t120_hook) nat_t120;
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/* Read T.120 address */
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if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
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memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
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port == 0)
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return 0;
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/* Create expect for T.120 connections */
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if ((exp = nf_ct_expect_alloc(ct)) == NULL)
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return -1;
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nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
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&ct->tuplehash[!dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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IPPROTO_TCP, NULL, &port);
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exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
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if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
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(nat_t120 = rcu_dereference(nat_t120_hook)) &&
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ct->status & IPS_NAT_MASK) {
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/* NAT needed */
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ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
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port, exp);
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} else { /* Conntrack only */
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if (nf_ct_expect_related(exp) == 0) {
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pr_debug("nf_ct_h323: expect T.120 ");
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nf_ct_dump_tuple(&exp->tuple);
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} else
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ret = -1;
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}
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nf_ct_expect_put(exp);
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return ret;
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}
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/****************************************************************************/
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static int process_h245_channel(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H2250LogicalChannelParameters *channel)
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{
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int ret;
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|
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if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
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/* RTP */
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ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
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&channel->mediaChannel);
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if (ret < 0)
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return -1;
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}
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|
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if (channel->
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options & eH2250LogicalChannelParameters_mediaControlChannel) {
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/* RTCP */
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ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
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&channel->mediaControlChannel);
|
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if (ret < 0)
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return -1;
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}
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|
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return 0;
|
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}
|
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|
|
/****************************************************************************/
|
|
static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
|
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enum ip_conntrack_info ctinfo,
|
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unsigned char **data, int dataoff,
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OpenLogicalChannel *olc)
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{
|
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int ret;
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|
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pr_debug("nf_ct_h323: OpenLogicalChannel\n");
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|
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if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
|
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eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
|
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{
|
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ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
|
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&olc->
|
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forwardLogicalChannelParameters.
|
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multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olc->options &
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters) &&
|
|
(olc->reverseLogicalChannelParameters.options &
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
|
|
&& (olc->reverseLogicalChannelParameters.multiplexParameters.
|
|
choice ==
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
|
|
{
|
|
ret =
|
|
process_h245_channel(skb, ct, ctinfo, data, dataoff,
|
|
&olc->
|
|
reverseLogicalChannelParameters.
|
|
multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olc->options & eOpenLogicalChannel_separateStack) &&
|
|
olc->forwardLogicalChannelParameters.dataType.choice ==
|
|
eDataType_data &&
|
|
olc->forwardLogicalChannelParameters.dataType.data.application.
|
|
choice == eDataApplicationCapability_application_t120 &&
|
|
olc->forwardLogicalChannelParameters.dataType.data.application.
|
|
t120.choice == eDataProtocolCapability_separateLANStack &&
|
|
olc->separateStack.networkAddress.choice ==
|
|
eNetworkAccessParameters_networkAddress_localAreaAddress) {
|
|
ret = expect_t120(skb, ct, ctinfo, data, dataoff,
|
|
&olc->separateStack.networkAddress.
|
|
localAreaAddress);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
OpenLogicalChannelAck *olca)
|
|
{
|
|
H2250LogicalChannelAckParameters *ack;
|
|
int ret;
|
|
|
|
pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
|
|
|
|
if ((olca->options &
|
|
eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
|
|
(olca->reverseLogicalChannelParameters.options &
|
|
eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
|
|
&& (olca->reverseLogicalChannelParameters.multiplexParameters.
|
|
choice ==
|
|
eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
|
|
{
|
|
ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
|
|
&olca->
|
|
reverseLogicalChannelParameters.
|
|
multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olca->options &
|
|
eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
|
|
(olca->forwardMultiplexAckParameters.choice ==
|
|
eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
|
|
{
|
|
ack = &olca->forwardMultiplexAckParameters.
|
|
h2250LogicalChannelAckParameters;
|
|
if (ack->options &
|
|
eH2250LogicalChannelAckParameters_mediaChannel) {
|
|
/* RTP */
|
|
ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
|
|
&ack->mediaChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (ack->options &
|
|
eH2250LogicalChannelAckParameters_mediaControlChannel) {
|
|
/* RTCP */
|
|
ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
|
|
&ack->mediaControlChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
|
|
olca->separateStack.networkAddress.choice ==
|
|
eNetworkAccessParameters_networkAddress_localAreaAddress) {
|
|
ret = expect_t120(skb, ct, ctinfo, data, dataoff,
|
|
&olca->separateStack.networkAddress.
|
|
localAreaAddress);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
MultimediaSystemControlMessage *mscm)
|
|
{
|
|
switch (mscm->choice) {
|
|
case eMultimediaSystemControlMessage_request:
|
|
if (mscm->request.choice ==
|
|
eRequestMessage_openLogicalChannel) {
|
|
return process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&mscm->request.openLogicalChannel);
|
|
}
|
|
pr_debug("nf_ct_h323: H.245 Request %d\n",
|
|
mscm->request.choice);
|
|
break;
|
|
case eMultimediaSystemControlMessage_response:
|
|
if (mscm->response.choice ==
|
|
eResponseMessage_openLogicalChannelAck) {
|
|
return process_olca(skb, ct, ctinfo, data, dataoff,
|
|
&mscm->response.
|
|
openLogicalChannelAck);
|
|
}
|
|
pr_debug("nf_ct_h323: H.245 Response %d\n",
|
|
mscm->response.choice);
|
|
break;
|
|
default:
|
|
pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int h245_help(struct sk_buff *skb, unsigned int protoff,
|
|
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
{
|
|
static MultimediaSystemControlMessage mscm;
|
|
unsigned char *data = NULL;
|
|
int datalen;
|
|
int dataoff;
|
|
int ret;
|
|
|
|
/* Until there's been traffic both ways, don't look in packets. */
|
|
if (ctinfo != IP_CT_ESTABLISHED &&
|
|
ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
|
|
return NF_ACCEPT;
|
|
}
|
|
pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
|
|
|
|
spin_lock_bh(&nf_h323_lock);
|
|
|
|
/* Process each TPKT */
|
|
while (get_tpkt_data(skb, protoff, ct, ctinfo,
|
|
&data, &datalen, &dataoff)) {
|
|
pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
|
|
nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
|
|
|
|
/* Decode H.245 signal */
|
|
ret = DecodeMultimediaSystemControlMessage(data, datalen,
|
|
&mscm);
|
|
if (ret < 0) {
|
|
pr_debug("nf_ct_h245: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
/* We don't drop when decoding error */
|
|
break;
|
|
}
|
|
|
|
/* Process H.245 signal */
|
|
if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
|
|
goto drop;
|
|
}
|
|
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
if (net_ratelimit())
|
|
printk("nf_ct_h245: packet dropped\n");
|
|
return NF_DROP;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static const struct nf_conntrack_expect_policy h245_exp_policy = {
|
|
.max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
|
|
.timeout = 240,
|
|
};
|
|
|
|
static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
|
|
.name = "H.245",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_UNSPEC,
|
|
.tuple.dst.protonum = IPPROTO_UDP,
|
|
.help = h245_help,
|
|
.expect_policy = &h245_exp_policy,
|
|
};
|
|
|
|
/****************************************************************************/
|
|
int get_h225_addr(struct nf_conn *ct, unsigned char *data,
|
|
TransportAddress *taddr,
|
|
union nf_inet_addr *addr, __be16 *port)
|
|
{
|
|
const unsigned char *p;
|
|
int len;
|
|
|
|
switch (taddr->choice) {
|
|
case eTransportAddress_ipAddress:
|
|
if (nf_ct_l3num(ct) != AF_INET)
|
|
return 0;
|
|
p = data + taddr->ipAddress.ip;
|
|
len = 4;
|
|
break;
|
|
case eTransportAddress_ip6Address:
|
|
if (nf_ct_l3num(ct) != AF_INET6)
|
|
return 0;
|
|
p = data + taddr->ip6Address.ip;
|
|
len = 16;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
memcpy(addr, p, len);
|
|
memset((void *)addr + len, 0, sizeof(*addr) - len);
|
|
memcpy(port, p + len, sizeof(__be16));
|
|
|
|
return 1;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
TransportAddress *taddr)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(nat_h245_hook) nat_h245;
|
|
|
|
/* Read h245Address */
|
|
if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
|
|
memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
|
|
port == 0)
|
|
return 0;
|
|
|
|
/* Create expect for h245 connection */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->helper = &nf_conntrack_helper_h245;
|
|
|
|
if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
|
|
(nat_h245 = rcu_dereference(nat_h245_hook)) &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
/* NAT needed */
|
|
ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
|
|
port, exp);
|
|
} else { /* Conntrack only */
|
|
if (nf_ct_expect_related(exp) == 0) {
|
|
pr_debug("nf_ct_q931: expect H.245 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* 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(const union nf_inet_addr *src,
|
|
const union nf_inet_addr *dst, int family)
|
|
{
|
|
const struct nf_afinfo *afinfo;
|
|
struct flowi fl1, fl2;
|
|
int ret = 0;
|
|
|
|
/* rcu_read_lock()ed by nf_hook_slow() */
|
|
afinfo = nf_get_afinfo(family);
|
|
if (!afinfo)
|
|
return 0;
|
|
|
|
memset(&fl1, 0, sizeof(fl1));
|
|
memset(&fl2, 0, sizeof(fl2));
|
|
|
|
switch (family) {
|
|
case AF_INET: {
|
|
struct rtable *rt1, *rt2;
|
|
|
|
fl1.fl4_dst = src->ip;
|
|
fl2.fl4_dst = dst->ip;
|
|
if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
|
|
if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
|
|
if (rt1->rt_gateway == rt2->rt_gateway &&
|
|
rt1->u.dst.dev == rt2->u.dst.dev)
|
|
ret = 1;
|
|
dst_release(&rt2->u.dst);
|
|
}
|
|
dst_release(&rt1->u.dst);
|
|
}
|
|
break;
|
|
}
|
|
#if defined(CONFIG_NF_CONNTRACK_IPV6) || \
|
|
defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
|
|
case AF_INET6: {
|
|
struct rt6_info *rt1, *rt2;
|
|
|
|
memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
|
|
memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
|
|
if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
|
|
if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
|
|
if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
|
|
sizeof(rt1->rt6i_gateway)) &&
|
|
rt1->u.dst.dev == rt2->u.dst.dev)
|
|
ret = 1;
|
|
dst_release(&rt2->u.dst);
|
|
}
|
|
dst_release(&rt1->u.dst);
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int expect_callforwarding(struct sk_buff *skb,
|
|
struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
TransportAddress *taddr)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(nat_callforwarding_hook) nat_callforwarding;
|
|
|
|
/* Read alternativeAddress */
|
|
if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
|
|
return 0;
|
|
|
|
/* If the calling party is on the same side of the forward-to party,
|
|
* we don't need to track the second call */
|
|
if (callforward_filter &&
|
|
callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
|
|
nf_ct_l3num(ct))) {
|
|
pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Create expect for the second call leg */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
|
|
if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
|
|
(nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
/* Need NAT */
|
|
ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
|
|
taddr, port, exp);
|
|
} else { /* Conntrack only */
|
|
if (nf_ct_expect_related(exp) == 0) {
|
|
pr_debug("nf_ct_q931: expect Call Forwarding ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Setup_UUIE *setup)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
int i;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
typeof(set_h225_addr_hook) set_h225_addr;
|
|
|
|
pr_debug("nf_ct_q931: Setup\n");
|
|
|
|
if (setup->options & eSetup_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
|
|
&setup->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
set_h225_addr = rcu_dereference(set_h225_addr_hook);
|
|
if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
|
|
(set_h225_addr) && ct->status & IPS_NAT_MASK &&
|
|
get_h225_addr(ct, *data, &setup->destCallSignalAddress,
|
|
&addr, &port) &&
|
|
memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
|
|
pr_debug("nf_ct_q931: set destCallSignalAddress "
|
|
NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
|
|
NIP6(*(struct in6_addr *)&addr), ntohs(port),
|
|
NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
|
|
ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
|
|
ret = set_h225_addr(skb, data, dataoff,
|
|
&setup->destCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.src.u3,
|
|
ct->tuplehash[!dir].tuple.src.u.tcp.port);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
|
|
(set_h225_addr) && ct->status & IPS_NAT_MASK &&
|
|
get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
|
|
&addr, &port) &&
|
|
memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
|
|
pr_debug("nf_ct_q931: set sourceCallSignalAddress "
|
|
NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
|
|
NIP6(*(struct in6_addr *)&addr), ntohs(port),
|
|
NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
|
|
ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
|
|
ret = set_h225_addr(skb, data, dataoff,
|
|
&setup->sourceCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
ct->tuplehash[!dir].tuple.dst.u.tcp.port);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (setup->options & eSetup_UUIE_fastStart) {
|
|
for (i = 0; i < setup->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&setup->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_callproceeding(struct sk_buff *skb,
|
|
struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
CallProceeding_UUIE *callproc)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: CallProceeding\n");
|
|
|
|
if (callproc->options & eCallProceeding_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
|
|
&callproc->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (callproc->options & eCallProceeding_UUIE_fastStart) {
|
|
for (i = 0; i < callproc->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&callproc->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Connect_UUIE *connect)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Connect\n");
|
|
|
|
if (connect->options & eConnect_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
|
|
&connect->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (connect->options & eConnect_UUIE_fastStart) {
|
|
for (i = 0; i < connect->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&connect->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Alerting_UUIE *alert)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Alerting\n");
|
|
|
|
if (alert->options & eAlerting_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
|
|
&alert->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (alert->options & eAlerting_UUIE_fastStart) {
|
|
for (i = 0; i < alert->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&alert->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Facility_UUIE *facility)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Facility\n");
|
|
|
|
if (facility->reason.choice == eFacilityReason_callForwarded) {
|
|
if (facility->options & eFacility_UUIE_alternativeAddress)
|
|
return expect_callforwarding(skb, ct, ctinfo, data,
|
|
dataoff,
|
|
&facility->
|
|
alternativeAddress);
|
|
return 0;
|
|
}
|
|
|
|
if (facility->options & eFacility_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
|
|
&facility->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (facility->options & eFacility_UUIE_fastStart) {
|
|
for (i = 0; i < facility->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&facility->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Progress_UUIE *progress)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Progress\n");
|
|
|
|
if (progress->options & eProgress_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
|
|
&progress->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (progress->options & eProgress_UUIE_fastStart) {
|
|
for (i = 0; i < progress->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo, data, dataoff,
|
|
&progress->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff, Q931 *q931)
|
|
{
|
|
H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
switch (pdu->h323_message_body.choice) {
|
|
case eH323_UU_PDU_h323_message_body_setup:
|
|
ret = process_setup(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.setup);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_callProceeding:
|
|
ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.
|
|
callProceeding);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_connect:
|
|
ret = process_connect(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.connect);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_alerting:
|
|
ret = process_alerting(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.alerting);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_facility:
|
|
ret = process_facility(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.facility);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_progress:
|
|
ret = process_progress(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.progress);
|
|
break;
|
|
default:
|
|
pr_debug("nf_ct_q931: Q.931 signal %d\n",
|
|
pdu->h323_message_body.choice);
|
|
break;
|
|
}
|
|
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (pdu->options & eH323_UU_PDU_h245Control) {
|
|
for (i = 0; i < pdu->h245Control.count; i++) {
|
|
ret = process_h245(skb, ct, ctinfo, data, dataoff,
|
|
&pdu->h245Control.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int q931_help(struct sk_buff *skb, unsigned int protoff,
|
|
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
{
|
|
static Q931 q931;
|
|
unsigned char *data = NULL;
|
|
int datalen;
|
|
int dataoff;
|
|
int ret;
|
|
|
|
/* Until there's been traffic both ways, don't look in packets. */
|
|
if (ctinfo != IP_CT_ESTABLISHED &&
|
|
ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
|
|
return NF_ACCEPT;
|
|
}
|
|
pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
|
|
|
|
spin_lock_bh(&nf_h323_lock);
|
|
|
|
/* Process each TPKT */
|
|
while (get_tpkt_data(skb, protoff, ct, ctinfo,
|
|
&data, &datalen, &dataoff)) {
|
|
pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
|
|
nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
|
|
|
|
/* Decode Q.931 signal */
|
|
ret = DecodeQ931(data, datalen, &q931);
|
|
if (ret < 0) {
|
|
pr_debug("nf_ct_q931: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
/* We don't drop when decoding error */
|
|
break;
|
|
}
|
|
|
|
/* Process Q.931 signal */
|
|
if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
|
|
goto drop;
|
|
}
|
|
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
if (net_ratelimit())
|
|
printk("nf_ct_q931: packet dropped\n");
|
|
return NF_DROP;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static const struct nf_conntrack_expect_policy q931_exp_policy = {
|
|
/* T.120 and H.245 */
|
|
.max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
|
|
.timeout = 240,
|
|
};
|
|
|
|
static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
|
|
{
|
|
.name = "Q.931",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET,
|
|
.tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
|
|
.tuple.dst.protonum = IPPROTO_TCP,
|
|
.help = q931_help,
|
|
.expect_policy = &q931_exp_policy,
|
|
},
|
|
{
|
|
.name = "Q.931",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET6,
|
|
.tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
|
|
.tuple.dst.protonum = IPPROTO_TCP,
|
|
.help = q931_help,
|
|
.expect_policy = &q931_exp_policy,
|
|
},
|
|
};
|
|
|
|
/****************************************************************************/
|
|
static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
|
|
int *datalen)
|
|
{
|
|
const struct udphdr *uh;
|
|
struct udphdr _uh;
|
|
int dataoff;
|
|
|
|
uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
|
|
if (uh == NULL)
|
|
return NULL;
|
|
dataoff = protoff + sizeof(_uh);
|
|
if (dataoff >= skb->len)
|
|
return NULL;
|
|
*datalen = skb->len - dataoff;
|
|
return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
|
|
union nf_inet_addr *addr,
|
|
__be16 port)
|
|
{
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conntrack_tuple tuple;
|
|
|
|
memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
|
|
tuple.src.u.tcp.port = 0;
|
|
memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
|
|
tuple.dst.u.tcp.port = port;
|
|
tuple.dst.protonum = IPPROTO_TCP;
|
|
|
|
exp = __nf_ct_expect_find(&tuple);
|
|
if (exp && exp->master == ct)
|
|
return exp;
|
|
return NULL;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int set_expect_timeout(struct nf_conntrack_expect *exp,
|
|
unsigned timeout)
|
|
{
|
|
if (!exp || !del_timer(&exp->timeout))
|
|
return 0;
|
|
|
|
exp->timeout.expires = jiffies + timeout * HZ;
|
|
add_timer(&exp->timeout);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data,
|
|
TransportAddress *taddr, int count)
|
|
{
|
|
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
int i;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(nat_q931_hook) nat_q931;
|
|
|
|
/* Look for the first related address */
|
|
for (i = 0; i < count; i++) {
|
|
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
|
|
memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
|
|
sizeof(addr)) == 0 && port != 0)
|
|
break;
|
|
}
|
|
|
|
if (i >= count) /* Not found */
|
|
return 0;
|
|
|
|
/* Create expect for Q.931 */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
gkrouted_only ? /* only accept calls from GK? */
|
|
&ct->tuplehash[!dir].tuple.src.u3 : NULL,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
|
|
|
|
nat_q931 = rcu_dereference(nat_q931_hook);
|
|
if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
|
|
ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
|
|
} else { /* Conntrack only */
|
|
if (nf_ct_expect_related(exp) == 0) {
|
|
pr_debug("nf_ct_ras: expect Q.931 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
|
|
/* Save port for looking up expect in processing RCF */
|
|
info->sig_port[dir] = port;
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, GatekeeperRequest *grq)
|
|
{
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
|
|
pr_debug("nf_ct_ras: GRQ\n");
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
|
|
return set_ras_addr(skb, ct, ctinfo, data,
|
|
&grq->rasAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, GatekeeperConfirm *gcf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
|
|
pr_debug("nf_ct_ras: GCF\n");
|
|
|
|
if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
|
|
return 0;
|
|
|
|
/* Registration port is the same as discovery port */
|
|
if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
|
|
port == ct->tuplehash[dir].tuple.src.u.udp.port)
|
|
return 0;
|
|
|
|
/* Avoid RAS expectation loops. A GCF is never expected. */
|
|
if (test_bit(IPS_EXPECTED_BIT, &ct->status))
|
|
return 0;
|
|
|
|
/* Need new expect */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_UDP, NULL, &port);
|
|
exp->helper = nf_conntrack_helper_ras;
|
|
|
|
if (nf_ct_expect_related(exp) == 0) {
|
|
pr_debug("nf_ct_ras: expect RAS ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, RegistrationRequest *rrq)
|
|
{
|
|
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
|
int ret;
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
|
|
pr_debug("nf_ct_ras: RRQ\n");
|
|
|
|
ret = expect_q931(skb, ct, ctinfo, data,
|
|
rrq->callSignalAddress.item,
|
|
rrq->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && ct->status & IPS_NAT_MASK) {
|
|
ret = set_ras_addr(skb, ct, ctinfo, data,
|
|
rrq->rasAddress.item,
|
|
rrq->rasAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (rrq->options & eRegistrationRequest_timeToLive) {
|
|
pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
|
|
info->timeout = rrq->timeToLive;
|
|
} else
|
|
info->timeout = default_rrq_ttl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, RegistrationConfirm *rcf)
|
|
{
|
|
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: RCF\n");
|
|
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && ct->status & IPS_NAT_MASK) {
|
|
ret = set_sig_addr(skb, ct, ctinfo, data,
|
|
rcf->callSignalAddress.item,
|
|
rcf->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (rcf->options & eRegistrationConfirm_timeToLive) {
|
|
pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
|
|
info->timeout = rcf->timeToLive;
|
|
}
|
|
|
|
if (info->timeout > 0) {
|
|
pr_debug("nf_ct_ras: set RAS connection timeout to "
|
|
"%u seconds\n", info->timeout);
|
|
nf_ct_refresh(ct, skb, info->timeout * HZ);
|
|
|
|
/* Set expect timeout */
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
|
|
info->sig_port[!dir]);
|
|
if (exp) {
|
|
pr_debug("nf_ct_ras: set Q.931 expect "
|
|
"timeout to %u seconds for",
|
|
info->timeout);
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
set_expect_timeout(exp, info->timeout);
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, UnregistrationRequest *urq)
|
|
{
|
|
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: URQ\n");
|
|
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && ct->status & IPS_NAT_MASK) {
|
|
ret = set_sig_addr(skb, ct, ctinfo, data,
|
|
urq->callSignalAddress.item,
|
|
urq->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
/* Clear old expect */
|
|
nf_ct_remove_expectations(ct);
|
|
info->sig_port[dir] = 0;
|
|
info->sig_port[!dir] = 0;
|
|
|
|
/* Give it 30 seconds for UCF or URJ */
|
|
nf_ct_refresh(ct, skb, 30 * HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, AdmissionRequest *arq)
|
|
{
|
|
const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
typeof(set_h225_addr_hook) set_h225_addr;
|
|
|
|
pr_debug("nf_ct_ras: ARQ\n");
|
|
|
|
set_h225_addr = rcu_dereference(set_h225_addr_hook);
|
|
if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
|
|
get_h225_addr(ct, *data, &arq->destCallSignalAddress,
|
|
&addr, &port) &&
|
|
!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
|
|
port == info->sig_port[dir] &&
|
|
set_h225_addr && ct->status & IPS_NAT_MASK) {
|
|
/* Answering ARQ */
|
|
return set_h225_addr(skb, data, 0,
|
|
&arq->destCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
info->sig_port[!dir]);
|
|
}
|
|
|
|
if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
|
|
get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
|
|
&addr, &port) &&
|
|
!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
|
|
set_h225_addr && ct->status & IPS_NAT_MASK) {
|
|
/* Calling ARQ */
|
|
return set_h225_addr(skb, data, 0,
|
|
&arq->srcCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
port);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, AdmissionConfirm *acf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: ACF\n");
|
|
|
|
if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
|
|
&addr, &port))
|
|
return 0;
|
|
|
|
if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
|
|
/* Answering ACF */
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && ct->status & IPS_NAT_MASK)
|
|
return set_sig_addr(skb, ct, ctinfo, data,
|
|
&acf->destCallSignalAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
/* Need new expect */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->flags = NF_CT_EXPECT_PERMANENT;
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
|
|
if (nf_ct_expect_related(exp) == 0) {
|
|
pr_debug("nf_ct_ras: expect Q.931 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, LocationRequest *lrq)
|
|
{
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
|
|
pr_debug("nf_ct_ras: LRQ\n");
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && ct->status & IPS_NAT_MASK)
|
|
return set_ras_addr(skb, ct, ctinfo, data,
|
|
&lrq->replyAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, LocationConfirm *lcf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
|
|
pr_debug("nf_ct_ras: LCF\n");
|
|
|
|
if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
|
|
&addr, &port))
|
|
return 0;
|
|
|
|
/* Need new expect for call signal */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->flags = NF_CT_EXPECT_PERMANENT;
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
|
|
if (nf_ct_expect_related(exp) == 0) {
|
|
pr_debug("nf_ct_ras: expect Q.931 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
/* Ignore rasAddress */
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, InfoRequestResponse *irr)
|
|
{
|
|
int ret;
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: IRR\n");
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && ct->status & IPS_NAT_MASK) {
|
|
ret = set_ras_addr(skb, ct, ctinfo, data,
|
|
&irr->rasAddress, 1);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && ct->status & IPS_NAT_MASK) {
|
|
ret = set_sig_addr(skb, ct, ctinfo, data,
|
|
irr->callSignalAddress.item,
|
|
irr->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, RasMessage *ras)
|
|
{
|
|
switch (ras->choice) {
|
|
case eRasMessage_gatekeeperRequest:
|
|
return process_grq(skb, ct, ctinfo, data,
|
|
&ras->gatekeeperRequest);
|
|
case eRasMessage_gatekeeperConfirm:
|
|
return process_gcf(skb, ct, ctinfo, data,
|
|
&ras->gatekeeperConfirm);
|
|
case eRasMessage_registrationRequest:
|
|
return process_rrq(skb, ct, ctinfo, data,
|
|
&ras->registrationRequest);
|
|
case eRasMessage_registrationConfirm:
|
|
return process_rcf(skb, ct, ctinfo, data,
|
|
&ras->registrationConfirm);
|
|
case eRasMessage_unregistrationRequest:
|
|
return process_urq(skb, ct, ctinfo, data,
|
|
&ras->unregistrationRequest);
|
|
case eRasMessage_admissionRequest:
|
|
return process_arq(skb, ct, ctinfo, data,
|
|
&ras->admissionRequest);
|
|
case eRasMessage_admissionConfirm:
|
|
return process_acf(skb, ct, ctinfo, data,
|
|
&ras->admissionConfirm);
|
|
case eRasMessage_locationRequest:
|
|
return process_lrq(skb, ct, ctinfo, data,
|
|
&ras->locationRequest);
|
|
case eRasMessage_locationConfirm:
|
|
return process_lcf(skb, ct, ctinfo, data,
|
|
&ras->locationConfirm);
|
|
case eRasMessage_infoRequestResponse:
|
|
return process_irr(skb, ct, ctinfo, data,
|
|
&ras->infoRequestResponse);
|
|
default:
|
|
pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int ras_help(struct sk_buff *skb, unsigned int protoff,
|
|
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
{
|
|
static RasMessage ras;
|
|
unsigned char *data;
|
|
int datalen = 0;
|
|
int ret;
|
|
|
|
pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
|
|
|
|
spin_lock_bh(&nf_h323_lock);
|
|
|
|
/* Get UDP data */
|
|
data = get_udp_data(skb, protoff, &datalen);
|
|
if (data == NULL)
|
|
goto accept;
|
|
pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
|
|
nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
|
|
|
|
/* Decode RAS message */
|
|
ret = DecodeRasMessage(data, datalen, &ras);
|
|
if (ret < 0) {
|
|
pr_debug("nf_ct_ras: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
goto accept;
|
|
}
|
|
|
|
/* Process RAS message */
|
|
if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
|
|
goto drop;
|
|
|
|
accept:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
if (net_ratelimit())
|
|
printk("nf_ct_ras: packet dropped\n");
|
|
return NF_DROP;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static const struct nf_conntrack_expect_policy ras_exp_policy = {
|
|
.max_expected = 32,
|
|
.timeout = 240,
|
|
};
|
|
|
|
static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
|
|
{
|
|
.name = "RAS",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET,
|
|
.tuple.src.u.udp.port = __constant_htons(RAS_PORT),
|
|
.tuple.dst.protonum = IPPROTO_UDP,
|
|
.help = ras_help,
|
|
.expect_policy = &ras_exp_policy,
|
|
},
|
|
{
|
|
.name = "RAS",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET6,
|
|
.tuple.src.u.udp.port = __constant_htons(RAS_PORT),
|
|
.tuple.dst.protonum = IPPROTO_UDP,
|
|
.help = ras_help,
|
|
.expect_policy = &ras_exp_policy,
|
|
},
|
|
};
|
|
|
|
/****************************************************************************/
|
|
static void __exit nf_conntrack_h323_fini(void)
|
|
{
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
|
|
kfree(h323_buffer);
|
|
pr_debug("nf_ct_h323: fini\n");
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int __init nf_conntrack_h323_init(void)
|
|
{
|
|
int ret;
|
|
|
|
h323_buffer = kmalloc(65536, GFP_KERNEL);
|
|
if (!h323_buffer)
|
|
return -ENOMEM;
|
|
ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
|
|
if (ret < 0)
|
|
goto err1;
|
|
ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
|
|
if (ret < 0)
|
|
goto err2;
|
|
ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
|
|
if (ret < 0)
|
|
goto err3;
|
|
ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
|
|
if (ret < 0)
|
|
goto err4;
|
|
ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
|
|
if (ret < 0)
|
|
goto err5;
|
|
pr_debug("nf_ct_h323: init success\n");
|
|
return 0;
|
|
|
|
err5:
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
|
|
err4:
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
|
|
err3:
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
|
|
err2:
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
|
|
err1:
|
|
kfree(h323_buffer);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
module_init(nf_conntrack_h323_init);
|
|
module_exit(nf_conntrack_h323_fini);
|
|
|
|
EXPORT_SYMBOL_GPL(get_h225_addr);
|
|
EXPORT_SYMBOL_GPL(set_h245_addr_hook);
|
|
EXPORT_SYMBOL_GPL(set_h225_addr_hook);
|
|
EXPORT_SYMBOL_GPL(set_sig_addr_hook);
|
|
EXPORT_SYMBOL_GPL(set_ras_addr_hook);
|
|
EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
|
|
EXPORT_SYMBOL_GPL(nat_t120_hook);
|
|
EXPORT_SYMBOL_GPL(nat_h245_hook);
|
|
EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
|
|
EXPORT_SYMBOL_GPL(nat_q931_hook);
|
|
|
|
MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
|
|
MODULE_DESCRIPTION("H.323 connection tracking helper");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("ip_conntrack_h323");
|