2006-12-03 07:09:57 +01:00
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/* SIP extension for IP connection tracking.
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*
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* (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
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* based on RR's ip_conntrack_ftp.c and other modules.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/skbuff.h>
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#include <linux/inet.h>
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#include <linux/in.h>
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#include <linux/udp.h>
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2006-12-03 07:12:54 +01:00
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#include <linux/netfilter.h>
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2006-12-03 07:09:57 +01:00
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <linux/netfilter/nf_conntrack_sip.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
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MODULE_DESCRIPTION("SIP connection tracking helper");
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MODULE_ALIAS("ip_conntrack_sip");
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#define MAX_PORTS 8
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static unsigned short ports[MAX_PORTS];
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static int ports_c;
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module_param_array(ports, ushort, &ports_c, 0400);
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MODULE_PARM_DESC(ports, "port numbers of SIP servers");
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static unsigned int sip_timeout __read_mostly = SIP_TIMEOUT;
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module_param(sip_timeout, uint, 0600);
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MODULE_PARM_DESC(sip_timeout, "timeout for the master SIP session");
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unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb,
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enum ip_conntrack_info ctinfo,
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struct nf_conn *ct,
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const char **dptr) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sip_hook);
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unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb,
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enum ip_conntrack_info ctinfo,
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struct nf_conntrack_expect *exp,
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const char *dptr) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sdp_hook);
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static int digits_len(struct nf_conn *, const char *, const char *, int *);
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static int epaddr_len(struct nf_conn *, const char *, const char *, int *);
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static int skp_digits_len(struct nf_conn *, const char *, const char *, int *);
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static int skp_epaddr_len(struct nf_conn *, const char *, const char *, int *);
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struct sip_header_nfo {
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const char *lname;
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const char *sname;
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const char *ln_str;
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size_t lnlen;
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size_t snlen;
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size_t ln_strlen;
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int case_sensitive;
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int (*match_len)(struct nf_conn *, const char *,
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const char *, int *);
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};
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static const struct sip_header_nfo ct_sip_hdrs[] = {
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[POS_REG_REQ_URI] = { /* SIP REGISTER request URI */
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.lname = "sip:",
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.lnlen = sizeof("sip:") - 1,
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.ln_str = ":",
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.ln_strlen = sizeof(":") - 1,
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.match_len = epaddr_len,
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},
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[POS_REQ_URI] = { /* SIP request URI */
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.lname = "sip:",
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.lnlen = sizeof("sip:") - 1,
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.ln_str = "@",
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.ln_strlen = sizeof("@") - 1,
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.match_len = epaddr_len,
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},
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[POS_FROM] = { /* SIP From header */
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.lname = "From:",
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.lnlen = sizeof("From:") - 1,
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.sname = "\r\nf:",
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.snlen = sizeof("\r\nf:") - 1,
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.ln_str = "sip:",
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.ln_strlen = sizeof("sip:") - 1,
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.match_len = skp_epaddr_len,
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},
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[POS_TO] = { /* SIP To header */
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.lname = "To:",
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.lnlen = sizeof("To:") - 1,
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.sname = "\r\nt:",
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.snlen = sizeof("\r\nt:") - 1,
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.ln_str = "sip:",
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.ln_strlen = sizeof("sip:") - 1,
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.match_len = skp_epaddr_len
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},
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[POS_VIA] = { /* SIP Via header */
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.lname = "Via:",
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.lnlen = sizeof("Via:") - 1,
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.sname = "\r\nv:",
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.snlen = sizeof("\r\nv:") - 1, /* rfc3261 "\r\n" */
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.ln_str = "UDP ",
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.ln_strlen = sizeof("UDP ") - 1,
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.match_len = epaddr_len,
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},
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[POS_CONTACT] = { /* SIP Contact header */
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.lname = "Contact:",
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.lnlen = sizeof("Contact:") - 1,
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.sname = "\r\nm:",
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.snlen = sizeof("\r\nm:") - 1,
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.ln_str = "sip:",
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.ln_strlen = sizeof("sip:") - 1,
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.match_len = skp_epaddr_len
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},
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[POS_CONTENT] = { /* SIP Content length header */
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.lname = "Content-Length:",
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.lnlen = sizeof("Content-Length:") - 1,
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.sname = "\r\nl:",
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.snlen = sizeof("\r\nl:") - 1,
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.ln_str = ":",
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.ln_strlen = sizeof(":") - 1,
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.match_len = skp_digits_len
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},
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[POS_MEDIA] = { /* SDP media info */
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.case_sensitive = 1,
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.lname = "\nm=",
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.lnlen = sizeof("\nm=") - 1,
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.sname = "\rm=",
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.snlen = sizeof("\rm=") - 1,
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.ln_str = "audio ",
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.ln_strlen = sizeof("audio ") - 1,
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.match_len = digits_len
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},
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[POS_OWNER_IP4] = { /* SDP owner address*/
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.case_sensitive = 1,
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.lname = "\no=",
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.lnlen = sizeof("\no=") - 1,
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.sname = "\ro=",
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.snlen = sizeof("\ro=") - 1,
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.ln_str = "IN IP4 ",
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.ln_strlen = sizeof("IN IP4 ") - 1,
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.match_len = epaddr_len
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},
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[POS_CONNECTION_IP4] = {/* SDP connection info */
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.case_sensitive = 1,
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.lname = "\nc=",
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.lnlen = sizeof("\nc=") - 1,
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.sname = "\rc=",
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.snlen = sizeof("\rc=") - 1,
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.ln_str = "IN IP4 ",
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.ln_strlen = sizeof("IN IP4 ") - 1,
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.match_len = epaddr_len
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},
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[POS_OWNER_IP6] = { /* SDP owner address*/
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.case_sensitive = 1,
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.lname = "\no=",
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.lnlen = sizeof("\no=") - 1,
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.sname = "\ro=",
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.snlen = sizeof("\ro=") - 1,
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.ln_str = "IN IP6 ",
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.ln_strlen = sizeof("IN IP6 ") - 1,
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.match_len = epaddr_len
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},
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[POS_CONNECTION_IP6] = {/* SDP connection info */
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.case_sensitive = 1,
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.lname = "\nc=",
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.lnlen = sizeof("\nc=") - 1,
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.sname = "\rc=",
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.snlen = sizeof("\rc=") - 1,
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.ln_str = "IN IP6 ",
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.ln_strlen = sizeof("IN IP6 ") - 1,
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.match_len = epaddr_len
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},
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[POS_SDP_HEADER] = { /* SDP version header */
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.case_sensitive = 1,
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.lname = "\nv=",
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.lnlen = sizeof("\nv=") - 1,
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.sname = "\rv=",
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.snlen = sizeof("\rv=") - 1,
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.ln_str = "=",
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.ln_strlen = sizeof("=") - 1,
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.match_len = digits_len
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}
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};
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/* get line lenght until first CR or LF seen. */
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int ct_sip_lnlen(const char *line, const char *limit)
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{
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const char *k = line;
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while ((line <= limit) && (*line == '\r' || *line == '\n'))
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line++;
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while (line <= limit) {
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if (*line == '\r' || *line == '\n')
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break;
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line++;
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}
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return line - k;
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}
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EXPORT_SYMBOL_GPL(ct_sip_lnlen);
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/* Linear string search, case sensitive. */
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const char *ct_sip_search(const char *needle, const char *haystack,
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size_t needle_len, size_t haystack_len,
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int case_sensitive)
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{
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const char *limit = haystack + (haystack_len - needle_len);
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while (haystack <= limit) {
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if (case_sensitive) {
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if (strncmp(haystack, needle, needle_len) == 0)
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return haystack;
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} else {
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if (strnicmp(haystack, needle, needle_len) == 0)
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return haystack;
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}
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haystack++;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(ct_sip_search);
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static int digits_len(struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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{
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int len = 0;
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while (dptr <= limit && isdigit(*dptr)) {
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dptr++;
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len++;
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}
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return len;
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}
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/* get digits lenght, skiping blank spaces. */
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static int skp_digits_len(struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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{
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for (; dptr <= limit && *dptr == ' '; dptr++)
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(*shift)++;
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return digits_len(ct, dptr, limit, shift);
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}
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static int parse_addr(struct nf_conn *ct, const char *cp, const char **endp,
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union nf_conntrack_address *addr, const char *limit)
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{
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const char *end;
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int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
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int ret = 0;
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switch (family) {
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case AF_INET:
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ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end);
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break;
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case AF_INET6:
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ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end);
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break;
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default:
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BUG();
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}
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if (ret == 0 || end == cp)
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return 0;
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if (endp)
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*endp = end;
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return 1;
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}
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/* skip ip address. returns its length. */
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static int epaddr_len(struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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{
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union nf_conntrack_address addr;
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const char *aux = dptr;
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if (!parse_addr(ct, dptr, &dptr, &addr, limit)) {
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DEBUGP("ip: %s parse failed.!\n", dptr);
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return 0;
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}
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/* Port number */
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if (*dptr == ':') {
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dptr++;
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dptr += digits_len(ct, dptr, limit, shift);
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}
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return dptr - aux;
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}
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/* get address length, skiping user info. */
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static int skp_epaddr_len(struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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{
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int s = *shift;
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2007-01-30 23:24:57 +01:00
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/* Search for @, but stop at the end of the line.
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* We are inside a sip: URI, so we don't need to worry about
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* continuation lines. */
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while (dptr <= limit &&
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*dptr != '@' && *dptr != '\r' && *dptr != '\n') {
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2006-12-03 07:09:57 +01:00
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(*shift)++;
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2007-01-30 23:24:57 +01:00
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dptr++;
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}
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2006-12-03 07:09:57 +01:00
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if (*dptr == '@') {
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dptr++;
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(*shift)++;
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} else
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*shift = s;
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return epaddr_len(ct, dptr, limit, shift);
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}
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/* Returns 0 if not found, -1 error parsing. */
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int ct_sip_get_info(struct nf_conn *ct,
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const char *dptr, size_t dlen,
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unsigned int *matchoff,
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unsigned int *matchlen,
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enum sip_header_pos pos)
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{
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const struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos];
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const char *limit, *aux, *k = dptr;
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int shift = 0;
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limit = dptr + (dlen - hnfo->lnlen);
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while (dptr <= limit) {
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if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) &&
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(strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {
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dptr++;
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continue;
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}
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aux = ct_sip_search(hnfo->ln_str, dptr, hnfo->ln_strlen,
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ct_sip_lnlen(dptr, limit),
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hnfo->case_sensitive);
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if (!aux) {
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DEBUGP("'%s' not found in '%s'.\n", hnfo->ln_str,
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hnfo->lname);
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return -1;
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}
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aux += hnfo->ln_strlen;
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*matchlen = hnfo->match_len(ct, aux, limit, &shift);
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if (!*matchlen)
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return -1;
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*matchoff = (aux - k) + shift;
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|
|
DEBUGP("%s match succeeded! - len: %u\n", hnfo->lname,
|
|
|
|
*matchlen);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
DEBUGP("%s header not found.\n", hnfo->lname);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ct_sip_get_info);
|
|
|
|
|
|
|
|
static int set_expected_rtp(struct sk_buff **pskb,
|
|
|
|
struct nf_conn *ct,
|
|
|
|
enum ip_conntrack_info ctinfo,
|
|
|
|
union nf_conntrack_address *addr,
|
|
|
|
__be16 port,
|
|
|
|
const char *dptr)
|
|
|
|
{
|
|
|
|
struct nf_conntrack_expect *exp;
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
int family = ct->tuplehash[!dir].tuple.src.l3num;
|
|
|
|
int ret;
|
|
|
|
typeof(nf_nat_sdp_hook) nf_nat_sdp;
|
|
|
|
|
|
|
|
exp = nf_conntrack_expect_alloc(ct);
|
|
|
|
if (exp == NULL)
|
|
|
|
return NF_DROP;
|
|
|
|
nf_conntrack_expect_init(exp, family,
|
|
|
|
&ct->tuplehash[!dir].tuple.src.u3, addr,
|
|
|
|
IPPROTO_UDP, NULL, &port);
|
|
|
|
|
|
|
|
nf_nat_sdp = rcu_dereference(nf_nat_sdp_hook);
|
|
|
|
if (nf_nat_sdp && ct->status & IPS_NAT_MASK)
|
|
|
|
ret = nf_nat_sdp(pskb, ctinfo, exp, dptr);
|
|
|
|
else {
|
|
|
|
if (nf_conntrack_expect_related(exp) != 0)
|
|
|
|
ret = NF_DROP;
|
|
|
|
else
|
|
|
|
ret = NF_ACCEPT;
|
|
|
|
}
|
|
|
|
nf_conntrack_expect_put(exp);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sip_help(struct sk_buff **pskb,
|
|
|
|
unsigned int protoff,
|
|
|
|
struct nf_conn *ct,
|
|
|
|
enum ip_conntrack_info ctinfo)
|
|
|
|
{
|
|
|
|
int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
|
|
|
union nf_conntrack_address addr;
|
|
|
|
unsigned int dataoff, datalen;
|
|
|
|
const char *dptr;
|
|
|
|
int ret = NF_ACCEPT;
|
|
|
|
int matchoff, matchlen;
|
|
|
|
u_int16_t port;
|
|
|
|
enum sip_header_pos pos;
|
|
|
|
typeof(nf_nat_sip_hook) nf_nat_sip;
|
|
|
|
|
|
|
|
/* No Data ? */
|
|
|
|
dataoff = protoff + sizeof(struct udphdr);
|
|
|
|
if (dataoff >= (*pskb)->len)
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
|
|
|
nf_ct_refresh(ct, *pskb, sip_timeout * HZ);
|
|
|
|
|
|
|
|
if (!skb_is_nonlinear(*pskb))
|
|
|
|
dptr = (*pskb)->data + dataoff;
|
|
|
|
else {
|
|
|
|
DEBUGP("Copy of skbuff not supported yet.\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
|
|
|
|
if (nf_nat_sip && ct->status & IPS_NAT_MASK) {
|
|
|
|
if (!nf_nat_sip(pskb, ctinfo, ct, &dptr)) {
|
|
|
|
ret = NF_DROP;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
datalen = (*pskb)->len - dataoff;
|
|
|
|
if (datalen < sizeof("SIP/2.0 200") - 1)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* RTP info only in some SDP pkts */
|
|
|
|
if (memcmp(dptr, "INVITE", sizeof("INVITE") - 1) != 0 &&
|
|
|
|
memcmp(dptr, "SIP/2.0 200", sizeof("SIP/2.0 200") - 1) != 0) {
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
/* Get address and port from SDP packet. */
|
|
|
|
pos = family == AF_INET ? POS_CONNECTION_IP4 : POS_CONNECTION_IP6;
|
|
|
|
if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, pos) > 0) {
|
|
|
|
|
|
|
|
/* We'll drop only if there are parse problems. */
|
|
|
|
if (!parse_addr(ct, dptr + matchoff, NULL, &addr,
|
|
|
|
dptr + datalen)) {
|
|
|
|
ret = NF_DROP;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen,
|
|
|
|
POS_MEDIA) > 0) {
|
|
|
|
|
|
|
|
port = simple_strtoul(dptr + matchoff, NULL, 10);
|
|
|
|
if (port < 1024) {
|
|
|
|
ret = NF_DROP;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
ret = set_expected_rtp(pskb, ct, ctinfo, &addr,
|
|
|
|
htons(port), dptr);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nf_conntrack_helper sip[MAX_PORTS][2] __read_mostly;
|
|
|
|
static char sip_names[MAX_PORTS][2][sizeof("sip-65535")] __read_mostly;
|
|
|
|
|
|
|
|
static void nf_conntrack_sip_fini(void)
|
|
|
|
{
|
|
|
|
int i, j;
|
|
|
|
|
|
|
|
for (i = 0; i < ports_c; i++) {
|
|
|
|
for (j = 0; j < 2; j++) {
|
|
|
|
if (sip[i][j].me == NULL)
|
|
|
|
continue;
|
|
|
|
nf_conntrack_helper_unregister(&sip[i][j]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init nf_conntrack_sip_init(void)
|
|
|
|
{
|
|
|
|
int i, j, ret;
|
|
|
|
char *tmpname;
|
|
|
|
|
|
|
|
if (ports_c == 0)
|
|
|
|
ports[ports_c++] = SIP_PORT;
|
|
|
|
|
|
|
|
for (i = 0; i < ports_c; i++) {
|
|
|
|
memset(&sip[i], 0, sizeof(sip[i]));
|
|
|
|
|
|
|
|
sip[i][0].tuple.src.l3num = AF_INET;
|
|
|
|
sip[i][1].tuple.src.l3num = AF_INET6;
|
|
|
|
for (j = 0; j < 2; j++) {
|
|
|
|
sip[i][j].tuple.dst.protonum = IPPROTO_UDP;
|
|
|
|
sip[i][j].tuple.src.u.udp.port = htons(ports[i]);
|
|
|
|
sip[i][j].mask.src.l3num = 0xFFFF;
|
|
|
|
sip[i][j].mask.src.u.udp.port = htons(0xFFFF);
|
|
|
|
sip[i][j].mask.dst.protonum = 0xFF;
|
|
|
|
sip[i][j].max_expected = 2;
|
|
|
|
sip[i][j].timeout = 3 * 60; /* 3 minutes */
|
|
|
|
sip[i][j].me = THIS_MODULE;
|
|
|
|
sip[i][j].help = sip_help;
|
|
|
|
|
|
|
|
tmpname = &sip_names[i][j][0];
|
|
|
|
if (ports[i] == SIP_PORT)
|
|
|
|
sprintf(tmpname, "sip");
|
|
|
|
else
|
|
|
|
sprintf(tmpname, "sip-%u", i);
|
|
|
|
sip[i][j].name = tmpname;
|
|
|
|
|
|
|
|
DEBUGP("port #%u: %u\n", i, ports[i]);
|
|
|
|
|
|
|
|
ret = nf_conntrack_helper_register(&sip[i][j]);
|
|
|
|
if (ret) {
|
|
|
|
printk("nf_ct_sip: failed to register helper "
|
|
|
|
"for pf: %u port: %u\n",
|
|
|
|
sip[i][j].tuple.src.l3num, ports[i]);
|
|
|
|
nf_conntrack_sip_fini();
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(nf_conntrack_sip_init);
|
|
|
|
module_exit(nf_conntrack_sip_fini);
|