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net/netfilter/nf_conntrack_sip.c
47.6 KB
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/* SIP extension for IP connection tracking. * * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar> * based on RR's ip_conntrack_ftp.c and other modules. |
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* (C) 2007 United Security Providers * (C) 2007, 2008 Patrick McHardy <kaber@trash.net> |
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* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/ctype.h> #include <linux/skbuff.h> #include <linux/inet.h> #include <linux/in.h> #include <linux/udp.h> |
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#include <linux/tcp.h> |
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#include <linux/netfilter.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_expect.h> #include <net/netfilter/nf_conntrack_helper.h> |
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#include <net/netfilter/nf_conntrack_zones.h> |
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#include <linux/netfilter/nf_conntrack_sip.h> |
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MODULE_LICENSE("GPL"); MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>"); MODULE_DESCRIPTION("SIP connection tracking helper"); MODULE_ALIAS("ip_conntrack_sip"); |
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MODULE_ALIAS_NFCT_HELPER("sip"); |
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#define MAX_PORTS 8 static unsigned short ports[MAX_PORTS]; |
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static unsigned int ports_c; |
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module_param_array(ports, ushort, &ports_c, 0400); MODULE_PARM_DESC(ports, "port numbers of SIP servers"); static unsigned int sip_timeout __read_mostly = SIP_TIMEOUT; module_param(sip_timeout, uint, 0600); MODULE_PARM_DESC(sip_timeout, "timeout for the master SIP session"); |
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static int sip_direct_signalling __read_mostly = 1; module_param(sip_direct_signalling, int, 0600); MODULE_PARM_DESC(sip_direct_signalling, "expect incoming calls from registrar " "only (default 1)"); |
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static int sip_direct_media __read_mostly = 1; module_param(sip_direct_media, int, 0600); MODULE_PARM_DESC(sip_direct_media, "Expect Media streams between signalling " "endpoints only (default 1)"); |
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unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, const char **dptr, |
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unsigned int *datalen) __read_mostly; |
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EXPORT_SYMBOL_GPL(nf_nat_sip_hook); |
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void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, unsigned int protoff, s16 off) __read_mostly; |
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EXPORT_SYMBOL_GPL(nf_nat_sip_seq_adjust_hook); |
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unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb, |
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unsigned int protoff, |
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unsigned int dataoff, |
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const char **dptr, unsigned int *datalen, struct nf_conntrack_expect *exp, unsigned int matchoff, unsigned int matchlen) __read_mostly; EXPORT_SYMBOL_GPL(nf_nat_sip_expect_hook); |
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unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
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const char **dptr, |
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unsigned int *datalen, |
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unsigned int sdpoff, |
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enum sdp_header_types type, enum sdp_header_types term, const union nf_inet_addr *addr) __read_mostly; EXPORT_SYMBOL_GPL(nf_nat_sdp_addr_hook); |
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unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
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const char **dptr, unsigned int *datalen, unsigned int matchoff, unsigned int matchlen, u_int16_t port) __read_mostly; EXPORT_SYMBOL_GPL(nf_nat_sdp_port_hook); |
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unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb, |
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unsigned int protoff, |
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unsigned int dataoff, |
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const char **dptr, |
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unsigned int *datalen, |
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unsigned int sdpoff, |
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const union nf_inet_addr *addr) __read_mostly; EXPORT_SYMBOL_GPL(nf_nat_sdp_session_hook); |
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unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
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const char **dptr, unsigned int *datalen, struct nf_conntrack_expect *rtp_exp, struct nf_conntrack_expect *rtcp_exp, unsigned int mediaoff, unsigned int medialen, union nf_inet_addr *rtp_addr) __read_mostly; EXPORT_SYMBOL_GPL(nf_nat_sdp_media_hook); |
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|
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static int string_len(const struct nf_conn *ct, const char *dptr, const char *limit, int *shift) { int len = 0; while (dptr < limit && isalpha(*dptr)) { dptr++; len++; } return len; } |
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static int digits_len(const struct nf_conn *ct, const char *dptr, |
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const char *limit, int *shift) { int len = 0; |
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while (dptr < limit && isdigit(*dptr)) { |
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dptr++; len++; } return len; } |
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static int iswordc(const char c) { if (isalnum(c) || c == '!' || c == '"' || c == '%' || (c >= '(' && c <= '/') || c == ':' || c == '<' || c == '>' || c == '?' || (c >= '[' && c <= ']') || c == '_' || c == '`' || c == '{' || c == '}' || c == '~') return 1; return 0; } static int word_len(const char *dptr, const char *limit) { int len = 0; while (dptr < limit && iswordc(*dptr)) { dptr++; len++; } return len; } static int callid_len(const struct nf_conn *ct, const char *dptr, const char *limit, int *shift) { int len, domain_len; len = word_len(dptr, limit); dptr += len; if (!len || dptr == limit || *dptr != '@') return len; dptr++; len++; domain_len = word_len(dptr, limit); if (!domain_len) return 0; return len + domain_len; } |
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/* get media type + port length */ static int media_len(const struct nf_conn *ct, const char *dptr, const char *limit, int *shift) { int len = string_len(ct, dptr, limit, shift); dptr += len; if (dptr >= limit || *dptr != ' ') return 0; len++; dptr++; return len + digits_len(ct, dptr, limit, shift); } |
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static int sip_parse_addr(const struct nf_conn *ct, const char *cp, const char **endp, union nf_inet_addr *addr, const char *limit, bool delim) |
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{ const char *end; |
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int ret; |
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|
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if (!ct) return 0; |
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memset(addr, 0, sizeof(*addr)); |
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switch (nf_ct_l3num(ct)) { |
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case AF_INET: ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end); |
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if (ret == 0) return 0; |
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break; case AF_INET6: |
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if (cp < limit && *cp == '[') cp++; else if (delim) return 0; |
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ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end); |
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if (ret == 0) return 0; if (end < limit && *end == ']') end++; else if (delim) return 0; |
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break; default: BUG(); } |
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if (endp) *endp = end; return 1; } /* skip ip address. returns its length. */ |
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static int epaddr_len(const struct nf_conn *ct, const char *dptr, |
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const char *limit, int *shift) { |
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union nf_inet_addr addr; |
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const char *aux = dptr; |
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if (!sip_parse_addr(ct, dptr, &dptr, &addr, limit, true)) { |
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pr_debug("ip: %s parse failed.! ", dptr); |
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return 0; } /* Port number */ if (*dptr == ':') { dptr++; dptr += digits_len(ct, dptr, limit, shift); } return dptr - aux; } /* get address length, skiping user info. */ |
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static int skp_epaddr_len(const struct nf_conn *ct, const char *dptr, |
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const char *limit, int *shift) { |
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const char *start = dptr; |
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int s = *shift; |
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/* Search for @, but stop at the end of the line. * We are inside a sip: URI, so we don't need to worry about * continuation lines. */ |
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while (dptr < limit && |
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*dptr != '@' && *dptr != '\r' && *dptr != ' ') { |
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(*shift)++; |
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dptr++; } |
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|
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if (dptr < limit && *dptr == '@') { |
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dptr++; (*shift)++; |
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} else { dptr = start; |
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*shift = s; |
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} |
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return epaddr_len(ct, dptr, limit, shift); } |
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/* Parse a SIP request line of the form: * * Request-Line = Method SP Request-URI SP SIP-Version CRLF * * and return the offset and length of the address contained in the Request-URI. */ int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr, unsigned int datalen, |
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unsigned int *matchoff, unsigned int *matchlen, union nf_inet_addr *addr, __be16 *port) |
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{ |
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const char *start = dptr, *limit = dptr + datalen, *end; |
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unsigned int mlen; |
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unsigned int p; |
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int shift = 0; /* Skip method and following whitespace */ mlen = string_len(ct, dptr, limit, NULL); if (!mlen) return 0; dptr += mlen; if (++dptr >= limit) return 0; /* Find SIP URI */ |
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for (; dptr < limit - strlen("sip:"); dptr++) { |
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if (*dptr == '\r' || *dptr == ' ') return -1; |
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if (strnicmp(dptr, "sip:", strlen("sip:")) == 0) { dptr += strlen("sip:"); |
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break; |
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} |
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} |
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if (!skp_epaddr_len(ct, dptr, limit, &shift)) |
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return 0; |
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dptr += shift; |
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if (!sip_parse_addr(ct, dptr, &end, addr, limit, true)) |
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return -1; if (end < limit && *end == ':') { end++; p = simple_strtoul(end, (char **)&end, 10); if (p < 1024 || p > 65535) return -1; *port = htons(p); } else *port = htons(SIP_PORT); if (end == dptr) return 0; *matchoff = dptr - start; *matchlen = end - dptr; |
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return 1; } EXPORT_SYMBOL_GPL(ct_sip_parse_request); |
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/* SIP header parsing: SIP headers are located at the beginning of a line, but * may span several lines, in which case the continuation lines begin with a * whitespace character. RFC 2543 allows lines to be terminated with CR, LF or * CRLF, RFC 3261 allows only CRLF, we support both. * * Headers are followed by (optionally) whitespace, a colon, again (optionally) * whitespace and the values. Whitespace in this context means any amount of * tabs, spaces and continuation lines, which are treated as a single whitespace * character. |
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* |
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* Some headers may appear multiple times. A comma separated list of values is |
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* equivalent to multiple headers. |
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*/ static const struct sip_header ct_sip_hdrs[] = { |
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[SIP_HDR_CSEQ] = SIP_HDR("CSeq", NULL, NULL, digits_len), |
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[SIP_HDR_FROM] = SIP_HDR("From", "f", "sip:", skp_epaddr_len), [SIP_HDR_TO] = SIP_HDR("To", "t", "sip:", skp_epaddr_len), [SIP_HDR_CONTACT] = SIP_HDR("Contact", "m", "sip:", skp_epaddr_len), |
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[SIP_HDR_VIA_UDP] = SIP_HDR("Via", "v", "UDP ", epaddr_len), [SIP_HDR_VIA_TCP] = SIP_HDR("Via", "v", "TCP ", epaddr_len), |
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[SIP_HDR_EXPIRES] = SIP_HDR("Expires", NULL, NULL, digits_len), |
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[SIP_HDR_CONTENT_LENGTH] = SIP_HDR("Content-Length", "l", NULL, digits_len), |
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[SIP_HDR_CALL_ID] = SIP_HDR("Call-Id", "i", NULL, callid_len), |
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}; static const char *sip_follow_continuation(const char *dptr, const char *limit) |
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{ |
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/* Walk past newline */ if (++dptr >= limit) return NULL; /* Skip ' ' in CR LF */ if (*(dptr - 1) == '\r' && *dptr == ' ') { if (++dptr >= limit) return NULL; } |
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|
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/* Continuation line? */ if (*dptr != ' ' && *dptr != '\t') return NULL; |
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|
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/* skip leading whitespace */ for (; dptr < limit; dptr++) { if (*dptr != ' ' && *dptr != '\t') break; } return dptr; } static const char *sip_skip_whitespace(const char *dptr, const char *limit) { for (; dptr < limit; dptr++) { if (*dptr == ' ') continue; if (*dptr != '\r' && *dptr != ' ') break; dptr = sip_follow_continuation(dptr, limit); if (dptr == NULL) return NULL; } return dptr; } /* Search within a SIP header value, dealing with continuation lines */ static const char *ct_sip_header_search(const char *dptr, const char *limit, const char *needle, unsigned int len) { for (limit -= len; dptr < limit; dptr++) { if (*dptr == '\r' || *dptr == ' ') { dptr = sip_follow_continuation(dptr, limit); if (dptr == NULL) break; |
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continue; } |
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if (strnicmp(dptr, needle, len) == 0) return dptr; } return NULL; } int ct_sip_get_header(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, enum sip_header_types type, unsigned int *matchoff, unsigned int *matchlen) { const struct sip_header *hdr = &ct_sip_hdrs[type]; const char *start = dptr, *limit = dptr + datalen; int shift = 0; for (dptr += dataoff; dptr < limit; dptr++) { /* Find beginning of line */ if (*dptr != '\r' && *dptr != ' ') continue; if (++dptr >= limit) break; if (*(dptr - 1) == '\r' && *dptr == ' ') { if (++dptr >= limit) break; |
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} |
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/* Skip continuation lines */ if (*dptr == ' ' || *dptr == '\t') continue; |
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/* Find header. Compact headers must be followed by a * non-alphabetic character to avoid mismatches. */ if (limit - dptr >= hdr->len && strnicmp(dptr, hdr->name, hdr->len) == 0) dptr += hdr->len; else if (hdr->cname && limit - dptr >= hdr->clen + 1 && strnicmp(dptr, hdr->cname, hdr->clen) == 0 && |
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!isalpha(*(dptr + hdr->clen))) |
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dptr += hdr->clen; else continue; |
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|
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/* Find and skip colon */ dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; if (*dptr != ':' || ++dptr >= limit) break; /* Skip whitespace after colon */ dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; *matchoff = dptr - start; if (hdr->search) { dptr = ct_sip_header_search(dptr, limit, hdr->search, hdr->slen); if (!dptr) return -1; dptr += hdr->slen; } *matchlen = hdr->match_len(ct, dptr, limit, &shift); if (!*matchlen) return -1; *matchoff = dptr - start + shift; |
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return 1; } |
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return 0; } |
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EXPORT_SYMBOL_GPL(ct_sip_get_header); |
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/* Get next header field in a list of comma separated values */ |
05e3ced29 [NETFILTER]: nf_c... |
472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 |
static int ct_sip_next_header(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, enum sip_header_types type, unsigned int *matchoff, unsigned int *matchlen) { const struct sip_header *hdr = &ct_sip_hdrs[type]; const char *start = dptr, *limit = dptr + datalen; int shift = 0; dptr += dataoff; dptr = ct_sip_header_search(dptr, limit, ",", strlen(",")); if (!dptr) return 0; dptr = ct_sip_header_search(dptr, limit, hdr->search, hdr->slen); if (!dptr) return 0; dptr += hdr->slen; *matchoff = dptr - start; *matchlen = hdr->match_len(ct, dptr, limit, &shift); if (!*matchlen) return -1; *matchoff += shift; return 1; } /* Walk through headers until a parsable one is found or no header of the * given type is left. */ static int ct_sip_walk_headers(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, enum sip_header_types type, int *in_header, unsigned int *matchoff, unsigned int *matchlen) { int ret; if (in_header && *in_header) { while (1) { ret = ct_sip_next_header(ct, dptr, dataoff, datalen, type, matchoff, matchlen); if (ret > 0) return ret; if (ret == 0) break; dataoff += *matchoff; } *in_header = 0; } while (1) { ret = ct_sip_get_header(ct, dptr, dataoff, datalen, type, matchoff, matchlen); if (ret > 0) break; if (ret == 0) return ret; dataoff += *matchoff; } if (in_header) *in_header = 1; return 1; } /* Locate a SIP header, parse the URI and return the offset and length of * the address as well as the address and port themselves. A stream of * headers can be parsed by handing in a non-NULL datalen and in_header * pointer. */ int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr, unsigned int *dataoff, unsigned int datalen, enum sip_header_types type, int *in_header, unsigned int *matchoff, unsigned int *matchlen, union nf_inet_addr *addr, __be16 *port) { const char *c, *limit = dptr + datalen; unsigned int p; int ret; ret = ct_sip_walk_headers(ct, dptr, dataoff ? *dataoff : 0, datalen, type, in_header, matchoff, matchlen); WARN_ON(ret < 0); if (ret == 0) return ret; |
02b69cbdc netfilter: nf_ct_... |
557 |
if (!sip_parse_addr(ct, dptr + *matchoff, &c, addr, limit, true)) |
05e3ced29 [NETFILTER]: nf_c... |
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 |
return -1; if (*c == ':') { c++; p = simple_strtoul(c, (char **)&c, 10); if (p < 1024 || p > 65535) return -1; *port = htons(p); } else *port = htons(SIP_PORT); if (dataoff) *dataoff = c - dptr; return 1; } EXPORT_SYMBOL_GPL(ct_sip_parse_header_uri); |
f5b321bd3 netfilter: nf_con... |
573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 |
static int ct_sip_parse_param(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, const char *name, unsigned int *matchoff, unsigned int *matchlen) { const char *limit = dptr + datalen; const char *start; const char *end; limit = ct_sip_header_search(dptr + dataoff, limit, ",", strlen(",")); if (!limit) limit = dptr + datalen; start = ct_sip_header_search(dptr + dataoff, limit, name, strlen(name)); if (!start) return 0; start += strlen(name); end = ct_sip_header_search(start, limit, ";", strlen(";")); if (!end) end = limit; *matchoff = start - dptr; *matchlen = end - start; return 1; } |
2bbb21168 [NETFILTER]: nf_c... |
599 600 601 602 603 |
/* Parse address from header parameter and return address, offset and length */ int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, const char *name, unsigned int *matchoff, unsigned int *matchlen, |
02b69cbdc netfilter: nf_ct_... |
604 |
union nf_inet_addr *addr, bool delim) |
2bbb21168 [NETFILTER]: nf_c... |
605 606 607 608 609 610 611 612 613 614 615 616 617 |
{ const char *limit = dptr + datalen; const char *start, *end; limit = ct_sip_header_search(dptr + dataoff, limit, ",", strlen(",")); if (!limit) limit = dptr + datalen; start = ct_sip_header_search(dptr + dataoff, limit, name, strlen(name)); if (!start) return 0; start += strlen(name); |
02b69cbdc netfilter: nf_ct_... |
618 |
if (!sip_parse_addr(ct, start, &end, addr, limit, delim)) |
2bbb21168 [NETFILTER]: nf_c... |
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 |
return 0; *matchoff = start - dptr; *matchlen = end - start; return 1; } EXPORT_SYMBOL_GPL(ct_sip_parse_address_param); /* Parse numerical header parameter and return value, offset and length */ int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, const char *name, unsigned int *matchoff, unsigned int *matchlen, unsigned int *val) { const char *limit = dptr + datalen; const char *start; char *end; limit = ct_sip_header_search(dptr + dataoff, limit, ",", strlen(",")); if (!limit) limit = dptr + datalen; start = ct_sip_header_search(dptr + dataoff, limit, name, strlen(name)); if (!start) return 0; start += strlen(name); *val = simple_strtoul(start, &end, 0); if (start == end) return 0; if (matchoff && matchlen) { *matchoff = start - dptr; *matchlen = end - start; } return 1; } EXPORT_SYMBOL_GPL(ct_sip_parse_numerical_param); |
f5b321bd3 netfilter: nf_con... |
656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 |
static int ct_sip_parse_transport(struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, u8 *proto) { unsigned int matchoff, matchlen; if (ct_sip_parse_param(ct, dptr, dataoff, datalen, "transport=", &matchoff, &matchlen)) { if (!strnicmp(dptr + matchoff, "TCP", strlen("TCP"))) *proto = IPPROTO_TCP; else if (!strnicmp(dptr + matchoff, "UDP", strlen("UDP"))) *proto = IPPROTO_UDP; else return 0; if (*proto != nf_ct_protonum(ct)) return 0; } else *proto = nf_ct_protonum(ct); return 1; } |
02b69cbdc netfilter: nf_ct_... |
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
static int sdp_parse_addr(const struct nf_conn *ct, const char *cp, const char **endp, union nf_inet_addr *addr, const char *limit) { const char *end; int ret; memset(addr, 0, sizeof(*addr)); switch (nf_ct_l3num(ct)) { case AF_INET: ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end); break; case AF_INET6: ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end); break; default: BUG(); } if (ret == 0) return 0; if (endp) *endp = end; return 1; } /* skip ip address. returns its length. */ static int sdp_addr_len(const struct nf_conn *ct, const char *dptr, const char *limit, int *shift) { union nf_inet_addr addr; const char *aux = dptr; if (!sdp_parse_addr(ct, dptr, &dptr, &addr, limit)) { pr_debug("ip: %s parse failed.! ", dptr); return 0; } return dptr - aux; } |
3e9b4600b [NETFILTER]: nf_c... |
719 720 721 722 723 724 725 726 727 |
/* SDP header parsing: a SDP session description contains an ordered set of * headers, starting with a section containing general session parameters, * optionally followed by multiple media descriptions. * * SDP headers always start at the beginning of a line. According to RFC 2327: * "The sequence CRLF (0x0d0a) is used to end a record, although parsers should * be tolerant and also accept records terminated with a single newline * character". We handle both cases. */ |
9a6648210 netfilter: nf_nat... |
728 729 730 731 732 733 734 735 736 737 738 739 |
static const struct sip_header ct_sdp_hdrs_v4[] = { [SDP_HDR_VERSION] = SDP_HDR("v=", NULL, digits_len), [SDP_HDR_OWNER] = SDP_HDR("o=", "IN IP4 ", sdp_addr_len), [SDP_HDR_CONNECTION] = SDP_HDR("c=", "IN IP4 ", sdp_addr_len), [SDP_HDR_MEDIA] = SDP_HDR("m=", NULL, media_len), }; static const struct sip_header ct_sdp_hdrs_v6[] = { [SDP_HDR_VERSION] = SDP_HDR("v=", NULL, digits_len), [SDP_HDR_OWNER] = SDP_HDR("o=", "IN IP6 ", sdp_addr_len), [SDP_HDR_CONNECTION] = SDP_HDR("c=", "IN IP6 ", sdp_addr_len), [SDP_HDR_MEDIA] = SDP_HDR("m=", NULL, media_len), |
3e9b4600b [NETFILTER]: nf_c... |
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 |
}; /* Linear string search within SDP header values */ static const char *ct_sdp_header_search(const char *dptr, const char *limit, const char *needle, unsigned int len) { for (limit -= len; dptr < limit; dptr++) { if (*dptr == '\r' || *dptr == ' ') break; if (strncmp(dptr, needle, len) == 0) return dptr; } return NULL; } /* Locate a SDP header (optionally a substring within the header value), |
25985edce Fix common misspe... |
757 |
* optionally stopping at the first occurrence of the term header, parse |
3e9b4600b [NETFILTER]: nf_c... |
758 759 760 761 762 763 764 765 |
* it and return the offset and length of the data we're interested in. */ int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, enum sdp_header_types type, enum sdp_header_types term, unsigned int *matchoff, unsigned int *matchlen) { |
9a6648210 netfilter: nf_nat... |
766 |
const struct sip_header *hdrs, *hdr, *thdr; |
3e9b4600b [NETFILTER]: nf_c... |
767 768 |
const char *start = dptr, *limit = dptr + datalen; int shift = 0; |
9a6648210 netfilter: nf_nat... |
769 770 771 |
hdrs = nf_ct_l3num(ct) == NFPROTO_IPV4 ? ct_sdp_hdrs_v4 : ct_sdp_hdrs_v6; hdr = &hdrs[type]; thdr = &hdrs[term]; |
3e9b4600b [NETFILTER]: nf_c... |
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 |
for (dptr += dataoff; dptr < limit; dptr++) { /* Find beginning of line */ if (*dptr != '\r' && *dptr != ' ') continue; if (++dptr >= limit) break; if (*(dptr - 1) == '\r' && *dptr == ' ') { if (++dptr >= limit) break; } if (term != SDP_HDR_UNSPEC && limit - dptr >= thdr->len && strnicmp(dptr, thdr->name, thdr->len) == 0) break; else if (limit - dptr >= hdr->len && strnicmp(dptr, hdr->name, hdr->len) == 0) dptr += hdr->len; else continue; *matchoff = dptr - start; if (hdr->search) { dptr = ct_sdp_header_search(dptr, limit, hdr->search, hdr->slen); if (!dptr) return -1; dptr += hdr->slen; } *matchlen = hdr->match_len(ct, dptr, limit, &shift); if (!*matchlen) return -1; *matchoff = dptr - start + shift; return 1; } return 0; } EXPORT_SYMBOL_GPL(ct_sip_get_sdp_header); |
4ab9e64e5 [NETFILTER]: nf_n... |
813 814 815 816 817 818 819 820 821 822 823 824 825 |
static int ct_sip_parse_sdp_addr(const struct nf_conn *ct, const char *dptr, unsigned int dataoff, unsigned int datalen, enum sdp_header_types type, enum sdp_header_types term, unsigned int *matchoff, unsigned int *matchlen, union nf_inet_addr *addr) { int ret; ret = ct_sip_get_sdp_header(ct, dptr, dataoff, datalen, type, term, matchoff, matchlen); if (ret <= 0) return ret; |
02b69cbdc netfilter: nf_ct_... |
826 827 |
if (!sdp_parse_addr(ct, dptr + *matchoff, NULL, addr, dptr + *matchoff + *matchlen)) |
4ab9e64e5 [NETFILTER]: nf_n... |
828 829 830 |
return -1; return 1; } |
0f32a40fc [NETFILTER]: nf_c... |
831 832 |
static int refresh_signalling_expectation(struct nf_conn *ct, union nf_inet_addr *addr, |
f5b321bd3 netfilter: nf_con... |
833 |
u8 proto, __be16 port, |
0f32a40fc [NETFILTER]: nf_c... |
834 |
unsigned int expires) |
9467ee380 [NETFILTER]: nf_c... |
835 836 837 |
{ struct nf_conn_help *help = nfct_help(ct); struct nf_conntrack_expect *exp; |
b67bfe0d4 hlist: drop the n... |
838 |
struct hlist_node *next; |
0f32a40fc [NETFILTER]: nf_c... |
839 |
int found = 0; |
9467ee380 [NETFILTER]: nf_c... |
840 841 |
spin_lock_bh(&nf_conntrack_lock); |
b67bfe0d4 hlist: drop the n... |
842 |
hlist_for_each_entry_safe(exp, next, &help->expectations, lnode) { |
0f32a40fc [NETFILTER]: nf_c... |
843 844 |
if (exp->class != SIP_EXPECT_SIGNALLING || !nf_inet_addr_cmp(&exp->tuple.dst.u3, addr) || |
f5b321bd3 netfilter: nf_con... |
845 |
exp->tuple.dst.protonum != proto || |
0f32a40fc [NETFILTER]: nf_c... |
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 |
exp->tuple.dst.u.udp.port != port) continue; if (!del_timer(&exp->timeout)) continue; exp->flags &= ~NF_CT_EXPECT_INACTIVE; exp->timeout.expires = jiffies + expires * HZ; add_timer(&exp->timeout); found = 1; break; } spin_unlock_bh(&nf_conntrack_lock); return found; } static void flush_expectations(struct nf_conn *ct, bool media) { struct nf_conn_help *help = nfct_help(ct); struct nf_conntrack_expect *exp; |
b67bfe0d4 hlist: drop the n... |
864 |
struct hlist_node *next; |
0f32a40fc [NETFILTER]: nf_c... |
865 866 |
spin_lock_bh(&nf_conntrack_lock); |
b67bfe0d4 hlist: drop the n... |
867 |
hlist_for_each_entry_safe(exp, next, &help->expectations, lnode) { |
0f32a40fc [NETFILTER]: nf_c... |
868 869 |
if ((exp->class != SIP_EXPECT_SIGNALLING) ^ media) continue; |
9467ee380 [NETFILTER]: nf_c... |
870 871 872 873 |
if (!del_timer(&exp->timeout)) continue; nf_ct_unlink_expect(exp); nf_ct_expect_put(exp); |
0f32a40fc [NETFILTER]: nf_c... |
874 875 |
if (!media) break; |
9467ee380 [NETFILTER]: nf_c... |
876 877 878 |
} spin_unlock_bh(&nf_conntrack_lock); } |
051966c0c netfilter: nf_nat... |
879 880 |
static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
a9c1d3591 [NETFILTER]: nf_c... |
881 |
const char **dptr, unsigned int *datalen, |
4ab9e64e5 [NETFILTER]: nf_n... |
882 |
union nf_inet_addr *daddr, __be16 port, |
0d0ab0378 [NETFILTER]: nf_c... |
883 |
enum sip_expectation_classes class, |
4ab9e64e5 [NETFILTER]: nf_n... |
884 |
unsigned int mediaoff, unsigned int medialen) |
9fafcd7b2 [NETFILTER]: nf_c... |
885 |
{ |
a9c1d3591 [NETFILTER]: nf_c... |
886 |
struct nf_conntrack_expect *exp, *rtp_exp, *rtcp_exp; |
212440a7d [NETFILTER]: nf_c... |
887 888 |
enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
a5c3a8005 netfilter: netns ... |
889 |
struct net *net = nf_ct_net(ct); |
9fafcd7b2 [NETFILTER]: nf_c... |
890 |
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
d901a9369 [NETFILTER]: nf_c... |
891 892 |
union nf_inet_addr *saddr; struct nf_conntrack_tuple tuple; |
c7f485abd [NETFILTER]: nf_c... |
893 |
int direct_rtp = 0, skip_expect = 0, ret = NF_DROP; |
a9c1d3591 [NETFILTER]: nf_c... |
894 895 |
u_int16_t base_port; __be16 rtp_port, rtcp_port; |
c7f485abd [NETFILTER]: nf_c... |
896 |
typeof(nf_nat_sdp_port_hook) nf_nat_sdp_port; |
4ab9e64e5 [NETFILTER]: nf_n... |
897 |
typeof(nf_nat_sdp_media_hook) nf_nat_sdp_media; |
9fafcd7b2 [NETFILTER]: nf_c... |
898 |
|
d901a9369 [NETFILTER]: nf_c... |
899 900 901 902 903 904 905 906 907 908 909 |
saddr = NULL; if (sip_direct_media) { if (!nf_inet_addr_cmp(daddr, &ct->tuplehash[dir].tuple.src.u3)) return NF_ACCEPT; saddr = &ct->tuplehash[!dir].tuple.src.u3; } /* We need to check whether the registration exists before attempting * to register it since we can see the same media description multiple * times on different connections in case multiple endpoints receive * the same call. |
c7f485abd [NETFILTER]: nf_c... |
910 911 912 913 914 915 916 917 |
* * RTP optimization: if we find a matching media channel expectation * and both the expectation and this connection are SNATed, we assume * both sides can reach each other directly and use the final * destination address from the expectation. We still need to keep * the NATed expectations for media that might arrive from the * outside, and additionally need to expect the direct RTP stream * in case it passes through us even without NAT. |
d901a9369 [NETFILTER]: nf_c... |
918 919 920 921 |
*/ memset(&tuple, 0, sizeof(tuple)); if (saddr) tuple.src.u3 = *saddr; |
5e8fbe2ac [NETFILTER]: nf_c... |
922 |
tuple.src.l3num = nf_ct_l3num(ct); |
d901a9369 [NETFILTER]: nf_c... |
923 924 925 926 927 |
tuple.dst.protonum = IPPROTO_UDP; tuple.dst.u3 = *daddr; tuple.dst.u.udp.port = port; rcu_read_lock(); |
c7f485abd [NETFILTER]: nf_c... |
928 |
do { |
5d0aa2ccd netfilter: nf_con... |
929 |
exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
d901a9369 [NETFILTER]: nf_c... |
930 |
|
c7f485abd [NETFILTER]: nf_c... |
931 932 933 934 |
if (!exp || exp->master == ct || nfct_help(exp->master)->helper != nfct_help(ct)->helper || exp->class != class) break; |
e1f9a4640 netfilter: Fix SI... |
935 |
#ifdef CONFIG_NF_NAT_NEEDED |
9a6648210 netfilter: nf_nat... |
936 937 |
if (!direct_rtp && (!nf_inet_addr_cmp(&exp->saved_addr, &exp->tuple.dst.u3) || |
c7f485abd [NETFILTER]: nf_c... |
938 939 |
exp->saved_proto.udp.port != exp->tuple.dst.u.udp.port) && ct->status & IPS_NAT_MASK) { |
9a6648210 netfilter: nf_nat... |
940 941 |
*daddr = exp->saved_addr; tuple.dst.u3 = exp->saved_addr; |
c7f485abd [NETFILTER]: nf_c... |
942 943 944 |
tuple.dst.u.udp.port = exp->saved_proto.udp.port; direct_rtp = 1; } else |
e1f9a4640 netfilter: Fix SI... |
945 |
#endif |
c7f485abd [NETFILTER]: nf_c... |
946 947 948 |
skip_expect = 1; } while (!skip_expect); rcu_read_unlock(); |
d901a9369 [NETFILTER]: nf_c... |
949 |
|
a9c1d3591 [NETFILTER]: nf_c... |
950 951 952 |
base_port = ntohs(tuple.dst.u.udp.port) & ~1; rtp_port = htons(base_port); rtcp_port = htons(base_port + 1); |
c7f485abd [NETFILTER]: nf_c... |
953 954 955 |
if (direct_rtp) { nf_nat_sdp_port = rcu_dereference(nf_nat_sdp_port_hook); if (nf_nat_sdp_port && |
051966c0c netfilter: nf_nat... |
956 |
!nf_nat_sdp_port(skb, protoff, dataoff, dptr, datalen, |
c7f485abd [NETFILTER]: nf_c... |
957 958 959 960 961 962 |
mediaoff, medialen, ntohs(rtp_port))) goto err1; } if (skip_expect) return NF_ACCEPT; |
a9c1d3591 [NETFILTER]: nf_c... |
963 964 965 |
rtp_exp = nf_ct_expect_alloc(ct); if (rtp_exp == NULL) goto err1; |
5e8fbe2ac [NETFILTER]: nf_c... |
966 |
nf_ct_expect_init(rtp_exp, class, nf_ct_l3num(ct), saddr, daddr, |
a9c1d3591 [NETFILTER]: nf_c... |
967 968 969 970 971 |
IPPROTO_UDP, NULL, &rtp_port); rtcp_exp = nf_ct_expect_alloc(ct); if (rtcp_exp == NULL) goto err2; |
5e8fbe2ac [NETFILTER]: nf_c... |
972 |
nf_ct_expect_init(rtcp_exp, class, nf_ct_l3num(ct), saddr, daddr, |
a9c1d3591 [NETFILTER]: nf_c... |
973 |
IPPROTO_UDP, NULL, &rtcp_port); |
9fafcd7b2 [NETFILTER]: nf_c... |
974 |
|
4ab9e64e5 [NETFILTER]: nf_n... |
975 |
nf_nat_sdp_media = rcu_dereference(nf_nat_sdp_media_hook); |
9a6648210 netfilter: nf_nat... |
976 |
if (nf_nat_sdp_media && ct->status & IPS_NAT_MASK && !direct_rtp) |
051966c0c netfilter: nf_nat... |
977 |
ret = nf_nat_sdp_media(skb, protoff, dataoff, dptr, datalen, |
3b6b9fab4 netfilter: nf_con... |
978 |
rtp_exp, rtcp_exp, |
4ab9e64e5 [NETFILTER]: nf_n... |
979 |
mediaoff, medialen, daddr); |
9fafcd7b2 [NETFILTER]: nf_c... |
980 |
else { |
a9c1d3591 [NETFILTER]: nf_c... |
981 982 983 984 985 986 |
if (nf_ct_expect_related(rtp_exp) == 0) { if (nf_ct_expect_related(rtcp_exp) != 0) nf_ct_unexpect_related(rtp_exp); else ret = NF_ACCEPT; } |
9fafcd7b2 [NETFILTER]: nf_c... |
987 |
} |
a9c1d3591 [NETFILTER]: nf_c... |
988 989 990 991 |
nf_ct_expect_put(rtcp_exp); err2: nf_ct_expect_put(rtp_exp); err1: |
9fafcd7b2 [NETFILTER]: nf_c... |
992 993 |
return ret; } |
0d0ab0378 [NETFILTER]: nf_c... |
994 995 996 |
static const struct sdp_media_type sdp_media_types[] = { SDP_MEDIA_TYPE("audio ", SIP_EXPECT_AUDIO), SDP_MEDIA_TYPE("video ", SIP_EXPECT_VIDEO), |
9d288dffe netfilter: nf_con... |
997 |
SDP_MEDIA_TYPE("image ", SIP_EXPECT_IMAGE), |
0d0ab0378 [NETFILTER]: nf_c... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 |
}; static const struct sdp_media_type *sdp_media_type(const char *dptr, unsigned int matchoff, unsigned int matchlen) { const struct sdp_media_type *t; unsigned int i; for (i = 0; i < ARRAY_SIZE(sdp_media_types); i++) { t = &sdp_media_types[i]; if (matchlen < t->len || strncmp(dptr + matchoff, t->name, t->len)) continue; return t; } return NULL; } |
051966c0c netfilter: nf_nat... |
1016 1017 |
static int process_sdp(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
30f33e6de [NETFILTER]: nf_c... |
1018 1019 |
const char **dptr, unsigned int *datalen, unsigned int cseq) |
7d3dd043b [NETFILTER]: nf_c... |
1020 1021 1022 |
{ enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
7d3dd043b [NETFILTER]: nf_c... |
1023 |
unsigned int matchoff, matchlen; |
4ab9e64e5 [NETFILTER]: nf_n... |
1024 1025 1026 |
unsigned int mediaoff, medialen; unsigned int sdpoff; unsigned int caddr_len, maddr_len; |
0d0ab0378 [NETFILTER]: nf_c... |
1027 |
unsigned int i; |
4ab9e64e5 [NETFILTER]: nf_n... |
1028 |
union nf_inet_addr caddr, maddr, rtp_addr; |
7d3dd043b [NETFILTER]: nf_c... |
1029 |
unsigned int port; |
0d0ab0378 [NETFILTER]: nf_c... |
1030 1031 |
const struct sdp_media_type *t; int ret = NF_ACCEPT; |
4ab9e64e5 [NETFILTER]: nf_n... |
1032 1033 |
typeof(nf_nat_sdp_addr_hook) nf_nat_sdp_addr; typeof(nf_nat_sdp_session_hook) nf_nat_sdp_session; |
7d3dd043b [NETFILTER]: nf_c... |
1034 |
|
0d0ab0378 [NETFILTER]: nf_c... |
1035 |
nf_nat_sdp_addr = rcu_dereference(nf_nat_sdp_addr_hook); |
7d3dd043b [NETFILTER]: nf_c... |
1036 |
|
4ab9e64e5 [NETFILTER]: nf_n... |
1037 |
/* Find beginning of session description */ |
7d3dd043b [NETFILTER]: nf_c... |
1038 |
if (ct_sip_get_sdp_header(ct, *dptr, 0, *datalen, |
4ab9e64e5 [NETFILTER]: nf_n... |
1039 |
SDP_HDR_VERSION, SDP_HDR_UNSPEC, |
7d3dd043b [NETFILTER]: nf_c... |
1040 1041 |
&matchoff, &matchlen) <= 0) return NF_ACCEPT; |
4ab9e64e5 [NETFILTER]: nf_n... |
1042 1043 1044 1045 1046 1047 1048 |
sdpoff = matchoff; /* The connection information is contained in the session description * and/or once per media description. The first media description marks * the end of the session description. */ caddr_len = 0; if (ct_sip_parse_sdp_addr(ct, *dptr, sdpoff, *datalen, |
9a6648210 netfilter: nf_nat... |
1049 |
SDP_HDR_CONNECTION, SDP_HDR_MEDIA, |
4ab9e64e5 [NETFILTER]: nf_n... |
1050 1051 |
&matchoff, &matchlen, &caddr) > 0) caddr_len = matchlen; |
0d0ab0378 [NETFILTER]: nf_c... |
1052 1053 1054 1055 1056 1057 |
mediaoff = sdpoff; for (i = 0; i < ARRAY_SIZE(sdp_media_types); ) { if (ct_sip_get_sdp_header(ct, *dptr, mediaoff, *datalen, SDP_HDR_MEDIA, SDP_HDR_UNSPEC, &mediaoff, &medialen) <= 0) break; |
7d3dd043b [NETFILTER]: nf_c... |
1058 |
|
0d0ab0378 [NETFILTER]: nf_c... |
1059 1060 1061 1062 1063 1064 1065 1066 1067 |
/* Get media type and port number. A media port value of zero * indicates an inactive stream. */ t = sdp_media_type(*dptr, mediaoff, medialen); if (!t) { mediaoff += medialen; continue; } mediaoff += t->len; medialen -= t->len; |
7d3dd043b [NETFILTER]: nf_c... |
1068 |
|
0d0ab0378 [NETFILTER]: nf_c... |
1069 1070 1071 |
port = simple_strtoul(*dptr + mediaoff, NULL, 10); if (port == 0) continue; |
b20ab9cc6 netfilter: nf_ct_... |
1072 1073 |
if (port < 1024 || port > 65535) { nf_ct_helper_log(skb, ct, "wrong port %u", port); |
0d0ab0378 [NETFILTER]: nf_c... |
1074 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1075 |
} |
4ab9e64e5 [NETFILTER]: nf_n... |
1076 |
|
0d0ab0378 [NETFILTER]: nf_c... |
1077 1078 1079 |
/* The media description overrides the session description. */ maddr_len = 0; if (ct_sip_parse_sdp_addr(ct, *dptr, mediaoff, *datalen, |
9a6648210 netfilter: nf_nat... |
1080 |
SDP_HDR_CONNECTION, SDP_HDR_MEDIA, |
0d0ab0378 [NETFILTER]: nf_c... |
1081 1082 1083 1084 1085 |
&matchoff, &matchlen, &maddr) > 0) { maddr_len = matchlen; memcpy(&rtp_addr, &maddr, sizeof(rtp_addr)); } else if (caddr_len) memcpy(&rtp_addr, &caddr, sizeof(rtp_addr)); |
b20ab9cc6 netfilter: nf_ct_... |
1086 1087 |
else { nf_ct_helper_log(skb, ct, "cannot parse SDP message"); |
0d0ab0378 [NETFILTER]: nf_c... |
1088 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1089 |
} |
0d0ab0378 [NETFILTER]: nf_c... |
1090 |
|
051966c0c netfilter: nf_nat... |
1091 1092 |
ret = set_expected_rtp_rtcp(skb, protoff, dataoff, dptr, datalen, |
0d0ab0378 [NETFILTER]: nf_c... |
1093 1094 |
&rtp_addr, htons(port), t->class, mediaoff, medialen); |
b20ab9cc6 netfilter: nf_ct_... |
1095 1096 1097 |
if (ret != NF_ACCEPT) { nf_ct_helper_log(skb, ct, "cannot add expectation for voice"); |
0d0ab0378 [NETFILTER]: nf_c... |
1098 |
return ret; |
b20ab9cc6 netfilter: nf_ct_... |
1099 |
} |
4ab9e64e5 [NETFILTER]: nf_n... |
1100 |
|
0d0ab0378 [NETFILTER]: nf_c... |
1101 |
/* Update media connection address if present */ |
9a6648210 netfilter: nf_nat... |
1102 |
if (maddr_len && nf_nat_sdp_addr && ct->status & IPS_NAT_MASK) { |
051966c0c netfilter: nf_nat... |
1103 |
ret = nf_nat_sdp_addr(skb, protoff, dataoff, |
9a6648210 netfilter: nf_nat... |
1104 1105 |
dptr, datalen, mediaoff, SDP_HDR_CONNECTION, SDP_HDR_MEDIA, |
3b6b9fab4 netfilter: nf_con... |
1106 |
&rtp_addr); |
b20ab9cc6 netfilter: nf_ct_... |
1107 1108 |
if (ret != NF_ACCEPT) { nf_ct_helper_log(skb, ct, "cannot mangle SDP"); |
4ab9e64e5 [NETFILTER]: nf_n... |
1109 |
return ret; |
b20ab9cc6 netfilter: nf_ct_... |
1110 |
} |
4ab9e64e5 [NETFILTER]: nf_n... |
1111 |
} |
0d0ab0378 [NETFILTER]: nf_c... |
1112 |
i++; |
4ab9e64e5 [NETFILTER]: nf_n... |
1113 1114 1115 1116 |
} /* Update session connection and owner addresses */ nf_nat_sdp_session = rcu_dereference(nf_nat_sdp_session_hook); |
9a6648210 netfilter: nf_nat... |
1117 |
if (nf_nat_sdp_session && ct->status & IPS_NAT_MASK) |
051966c0c netfilter: nf_nat... |
1118 1119 |
ret = nf_nat_sdp_session(skb, protoff, dataoff, dptr, datalen, sdpoff, &rtp_addr); |
4ab9e64e5 [NETFILTER]: nf_n... |
1120 1121 |
return ret; |
7d3dd043b [NETFILTER]: nf_c... |
1122 |
} |
051966c0c netfilter: nf_nat... |
1123 1124 |
static int process_invite_response(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
30f33e6de [NETFILTER]: nf_c... |
1125 1126 1127 |
const char **dptr, unsigned int *datalen, unsigned int cseq, unsigned int code) { |
9467ee380 [NETFILTER]: nf_c... |
1128 1129 |
enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1afc56794 netfilter: nf_ct_... |
1130 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); |
9467ee380 [NETFILTER]: nf_c... |
1131 |
|
30f33e6de [NETFILTER]: nf_c... |
1132 1133 |
if ((code >= 100 && code <= 199) || (code >= 200 && code <= 299)) |
051966c0c netfilter: nf_nat... |
1134 |
return process_sdp(skb, protoff, dataoff, dptr, datalen, cseq); |
1afc56794 netfilter: nf_ct_... |
1135 |
else if (ct_sip_info->invite_cseq == cseq) |
0f32a40fc [NETFILTER]: nf_c... |
1136 |
flush_expectations(ct, true); |
ef75d49f1 netfilter: nf_con... |
1137 |
return NF_ACCEPT; |
30f33e6de [NETFILTER]: nf_c... |
1138 |
} |
051966c0c netfilter: nf_nat... |
1139 1140 |
static int process_update_response(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
30f33e6de [NETFILTER]: nf_c... |
1141 1142 1143 |
const char **dptr, unsigned int *datalen, unsigned int cseq, unsigned int code) { |
9467ee380 [NETFILTER]: nf_c... |
1144 1145 |
enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1afc56794 netfilter: nf_ct_... |
1146 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); |
9467ee380 [NETFILTER]: nf_c... |
1147 |
|
30f33e6de [NETFILTER]: nf_c... |
1148 1149 |
if ((code >= 100 && code <= 199) || (code >= 200 && code <= 299)) |
051966c0c netfilter: nf_nat... |
1150 |
return process_sdp(skb, protoff, dataoff, dptr, datalen, cseq); |
1afc56794 netfilter: nf_ct_... |
1151 |
else if (ct_sip_info->invite_cseq == cseq) |
0f32a40fc [NETFILTER]: nf_c... |
1152 |
flush_expectations(ct, true); |
ef75d49f1 netfilter: nf_con... |
1153 |
return NF_ACCEPT; |
30f33e6de [NETFILTER]: nf_c... |
1154 |
} |
051966c0c netfilter: nf_nat... |
1155 1156 |
static int process_prack_response(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
595a8ecb5 [NETFILTER]: nf_c... |
1157 1158 1159 |
const char **dptr, unsigned int *datalen, unsigned int cseq, unsigned int code) { |
9467ee380 [NETFILTER]: nf_c... |
1160 1161 |
enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1afc56794 netfilter: nf_ct_... |
1162 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); |
9467ee380 [NETFILTER]: nf_c... |
1163 |
|
595a8ecb5 [NETFILTER]: nf_c... |
1164 1165 |
if ((code >= 100 && code <= 199) || (code >= 200 && code <= 299)) |
051966c0c netfilter: nf_nat... |
1166 |
return process_sdp(skb, protoff, dataoff, dptr, datalen, cseq); |
1afc56794 netfilter: nf_ct_... |
1167 |
else if (ct_sip_info->invite_cseq == cseq) |
0f32a40fc [NETFILTER]: nf_c... |
1168 |
flush_expectations(ct, true); |
ef75d49f1 netfilter: nf_con... |
1169 |
return NF_ACCEPT; |
9467ee380 [NETFILTER]: nf_c... |
1170 |
} |
051966c0c netfilter: nf_nat... |
1171 1172 |
static int process_invite_request(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
9d288dffe netfilter: nf_con... |
1173 1174 1175 1176 1177 |
const char **dptr, unsigned int *datalen, unsigned int cseq) { enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1afc56794 netfilter: nf_ct_... |
1178 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); |
9d288dffe netfilter: nf_con... |
1179 1180 1181 |
unsigned int ret; flush_expectations(ct, true); |
051966c0c netfilter: nf_nat... |
1182 |
ret = process_sdp(skb, protoff, dataoff, dptr, datalen, cseq); |
9d288dffe netfilter: nf_con... |
1183 |
if (ret == NF_ACCEPT) |
1afc56794 netfilter: nf_ct_... |
1184 |
ct_sip_info->invite_cseq = cseq; |
9d288dffe netfilter: nf_con... |
1185 1186 |
return ret; } |
051966c0c netfilter: nf_nat... |
1187 1188 |
static int process_bye_request(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
9467ee380 [NETFILTER]: nf_c... |
1189 1190 1191 1192 1193 |
const char **dptr, unsigned int *datalen, unsigned int cseq) { enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
595a8ecb5 [NETFILTER]: nf_c... |
1194 |
|
0f32a40fc [NETFILTER]: nf_c... |
1195 1196 1197 1198 1199 1200 1201 1202 |
flush_expectations(ct, true); return NF_ACCEPT; } /* Parse a REGISTER request and create a permanent expectation for incoming * signalling connections. The expectation is marked inactive and is activated * when receiving a response indicating success from the registrar. */ |
051966c0c netfilter: nf_nat... |
1203 1204 |
static int process_register_request(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
0f32a40fc [NETFILTER]: nf_c... |
1205 1206 1207 1208 1209 |
const char **dptr, unsigned int *datalen, unsigned int cseq) { enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1afc56794 netfilter: nf_ct_... |
1210 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); |
0f32a40fc [NETFILTER]: nf_c... |
1211 |
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
0f32a40fc [NETFILTER]: nf_c... |
1212 1213 1214 1215 |
unsigned int matchoff, matchlen; struct nf_conntrack_expect *exp; union nf_inet_addr *saddr, daddr; __be16 port; |
f5b321bd3 netfilter: nf_con... |
1216 |
u8 proto; |
0f32a40fc [NETFILTER]: nf_c... |
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 |
unsigned int expires = 0; int ret; typeof(nf_nat_sip_expect_hook) nf_nat_sip_expect; /* Expected connections can not register again. */ if (ct->status & IPS_EXPECTED) return NF_ACCEPT; /* We must check the expiration time: a value of zero signals the * registrar to release the binding. We'll remove our expectation * when receiving the new bindings in the response, but we don't * want to create new ones. * * The expiration time may be contained in Expires: header, the * Contact: header parameters or the URI parameters. */ if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_EXPIRES, &matchoff, &matchlen) > 0) expires = simple_strtoul(*dptr + matchoff, NULL, 10); ret = ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen, SIP_HDR_CONTACT, NULL, &matchoff, &matchlen, &daddr, &port); |
b20ab9cc6 netfilter: nf_ct_... |
1240 1241 |
if (ret < 0) { nf_ct_helper_log(skb, ct, "cannot parse contact"); |
0f32a40fc [NETFILTER]: nf_c... |
1242 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1243 |
} else if (ret == 0) |
0f32a40fc [NETFILTER]: nf_c... |
1244 1245 1246 1247 1248 |
return NF_ACCEPT; /* We don't support third-party registrations */ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3, &daddr)) return NF_ACCEPT; |
f5b321bd3 netfilter: nf_con... |
1249 1250 1251 |
if (ct_sip_parse_transport(ct, *dptr, matchoff + matchlen, *datalen, &proto) == 0) return NF_ACCEPT; |
0f32a40fc [NETFILTER]: nf_c... |
1252 1253 |
if (ct_sip_parse_numerical_param(ct, *dptr, matchoff + matchlen, *datalen, |
b20ab9cc6 netfilter: nf_ct_... |
1254 1255 |
"expires=", NULL, NULL, &expires) < 0) { nf_ct_helper_log(skb, ct, "cannot parse expires"); |
0f32a40fc [NETFILTER]: nf_c... |
1256 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1257 |
} |
0f32a40fc [NETFILTER]: nf_c... |
1258 1259 1260 1261 1262 1263 1264 |
if (expires == 0) { ret = NF_ACCEPT; goto store_cseq; } exp = nf_ct_expect_alloc(ct); |
b20ab9cc6 netfilter: nf_ct_... |
1265 1266 |
if (!exp) { nf_ct_helper_log(skb, ct, "cannot alloc expectation"); |
0f32a40fc [NETFILTER]: nf_c... |
1267 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1268 |
} |
0f32a40fc [NETFILTER]: nf_c... |
1269 1270 1271 1272 |
saddr = NULL; if (sip_direct_signalling) saddr = &ct->tuplehash[!dir].tuple.src.u3; |
5e8fbe2ac [NETFILTER]: nf_c... |
1273 |
nf_ct_expect_init(exp, SIP_EXPECT_SIGNALLING, nf_ct_l3num(ct), |
f5b321bd3 netfilter: nf_con... |
1274 |
saddr, &daddr, proto, NULL, &port); |
0f32a40fc [NETFILTER]: nf_c... |
1275 1276 1277 1278 1279 |
exp->timeout.expires = sip_timeout * HZ; exp->helper = nfct_help(ct)->helper; exp->flags = NF_CT_EXPECT_PERMANENT | NF_CT_EXPECT_INACTIVE; nf_nat_sip_expect = rcu_dereference(nf_nat_sip_expect_hook); |
9a6648210 netfilter: nf_nat... |
1280 |
if (nf_nat_sip_expect && ct->status & IPS_NAT_MASK) |
051966c0c netfilter: nf_nat... |
1281 1282 |
ret = nf_nat_sip_expect(skb, protoff, dataoff, dptr, datalen, exp, matchoff, matchlen); |
0f32a40fc [NETFILTER]: nf_c... |
1283 |
else { |
b20ab9cc6 netfilter: nf_ct_... |
1284 1285 |
if (nf_ct_expect_related(exp) != 0) { nf_ct_helper_log(skb, ct, "cannot add expectation"); |
0f32a40fc [NETFILTER]: nf_c... |
1286 |
ret = NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1287 |
} else |
0f32a40fc [NETFILTER]: nf_c... |
1288 1289 1290 1291 1292 1293 |
ret = NF_ACCEPT; } nf_ct_expect_put(exp); store_cseq: if (ret == NF_ACCEPT) |
1afc56794 netfilter: nf_ct_... |
1294 |
ct_sip_info->register_cseq = cseq; |
0f32a40fc [NETFILTER]: nf_c... |
1295 1296 |
return ret; } |
051966c0c netfilter: nf_nat... |
1297 1298 |
static int process_register_response(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
0f32a40fc [NETFILTER]: nf_c... |
1299 1300 1301 1302 1303 |
const char **dptr, unsigned int *datalen, unsigned int cseq, unsigned int code) { enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1afc56794 netfilter: nf_ct_... |
1304 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); |
0f32a40fc [NETFILTER]: nf_c... |
1305 1306 1307 |
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); union nf_inet_addr addr; __be16 port; |
f5b321bd3 netfilter: nf_con... |
1308 |
u8 proto; |
3b6b9fab4 netfilter: nf_con... |
1309 |
unsigned int matchoff, matchlen, coff = 0; |
0f32a40fc [NETFILTER]: nf_c... |
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 |
unsigned int expires = 0; int in_contact = 0, ret; /* According to RFC 3261, "UAs MUST NOT send a new registration until * they have received a final response from the registrar for the * previous one or the previous REGISTER request has timed out". * * However, some servers fail to detect retransmissions and send late * responses, so we store the sequence number of the last valid * request and compare it here. */ |
1afc56794 netfilter: nf_ct_... |
1321 |
if (ct_sip_info->register_cseq != cseq) |
0f32a40fc [NETFILTER]: nf_c... |
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 |
return NF_ACCEPT; if (code >= 100 && code <= 199) return NF_ACCEPT; if (code < 200 || code > 299) goto flush; if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_EXPIRES, &matchoff, &matchlen) > 0) expires = simple_strtoul(*dptr + matchoff, NULL, 10); while (1) { unsigned int c_expires = expires; |
3b6b9fab4 netfilter: nf_con... |
1335 |
ret = ct_sip_parse_header_uri(ct, *dptr, &coff, *datalen, |
0f32a40fc [NETFILTER]: nf_c... |
1336 1337 1338 |
SIP_HDR_CONTACT, &in_contact, &matchoff, &matchlen, &addr, &port); |
b20ab9cc6 netfilter: nf_ct_... |
1339 1340 |
if (ret < 0) { nf_ct_helper_log(skb, ct, "cannot parse contact"); |
0f32a40fc [NETFILTER]: nf_c... |
1341 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1342 |
} else if (ret == 0) |
0f32a40fc [NETFILTER]: nf_c... |
1343 1344 1345 1346 1347 |
break; /* We don't support third-party registrations */ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3, &addr)) continue; |
f5b321bd3 netfilter: nf_con... |
1348 1349 1350 |
if (ct_sip_parse_transport(ct, *dptr, matchoff + matchlen, *datalen, &proto) == 0) continue; |
0f32a40fc [NETFILTER]: nf_c... |
1351 1352 1353 1354 |
ret = ct_sip_parse_numerical_param(ct, *dptr, matchoff + matchlen, *datalen, "expires=", NULL, NULL, &c_expires); |
b20ab9cc6 netfilter: nf_ct_... |
1355 1356 |
if (ret < 0) { nf_ct_helper_log(skb, ct, "cannot parse expires"); |
0f32a40fc [NETFILTER]: nf_c... |
1357 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1358 |
} |
0f32a40fc [NETFILTER]: nf_c... |
1359 1360 |
if (c_expires == 0) break; |
f5b321bd3 netfilter: nf_con... |
1361 1362 |
if (refresh_signalling_expectation(ct, &addr, proto, port, c_expires)) |
0f32a40fc [NETFILTER]: nf_c... |
1363 1364 1365 1366 1367 |
return NF_ACCEPT; } flush: flush_expectations(ct, false); |
595a8ecb5 [NETFILTER]: nf_c... |
1368 1369 |
return NF_ACCEPT; } |
30f33e6de [NETFILTER]: nf_c... |
1370 |
static const struct sip_handler sip_handlers[] = { |
9d288dffe netfilter: nf_con... |
1371 |
SIP_HANDLER("INVITE", process_invite_request, process_invite_response), |
30f33e6de [NETFILTER]: nf_c... |
1372 |
SIP_HANDLER("UPDATE", process_sdp, process_update_response), |
595a8ecb5 [NETFILTER]: nf_c... |
1373 1374 |
SIP_HANDLER("ACK", process_sdp, NULL), SIP_HANDLER("PRACK", process_sdp, process_prack_response), |
9467ee380 [NETFILTER]: nf_c... |
1375 |
SIP_HANDLER("BYE", process_bye_request, NULL), |
0f32a40fc [NETFILTER]: nf_c... |
1376 |
SIP_HANDLER("REGISTER", process_register_request, process_register_response), |
30f33e6de [NETFILTER]: nf_c... |
1377 |
}; |
051966c0c netfilter: nf_nat... |
1378 1379 |
static int process_sip_response(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
30f33e6de [NETFILTER]: nf_c... |
1380 1381 |
const char **dptr, unsigned int *datalen) { |
30f33e6de [NETFILTER]: nf_c... |
1382 1383 |
enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
3b6b9fab4 netfilter: nf_con... |
1384 1385 |
unsigned int matchoff, matchlen, matchend; unsigned int code, cseq, i; |
30f33e6de [NETFILTER]: nf_c... |
1386 1387 1388 1389 |
if (*datalen < strlen("SIP/2.0 200")) return NF_ACCEPT; code = simple_strtoul(*dptr + strlen("SIP/2.0 "), NULL, 10); |
b20ab9cc6 netfilter: nf_ct_... |
1390 1391 |
if (!code) { nf_ct_helper_log(skb, ct, "cannot get code"); |
30f33e6de [NETFILTER]: nf_c... |
1392 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1393 |
} |
30f33e6de [NETFILTER]: nf_c... |
1394 1395 |
if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ, |
b20ab9cc6 netfilter: nf_ct_... |
1396 1397 |
&matchoff, &matchlen) <= 0) { nf_ct_helper_log(skb, ct, "cannot parse cseq"); |
30f33e6de [NETFILTER]: nf_c... |
1398 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1399 |
} |
30f33e6de [NETFILTER]: nf_c... |
1400 |
cseq = simple_strtoul(*dptr + matchoff, NULL, 10); |
b20ab9cc6 netfilter: nf_ct_... |
1401 1402 |
if (!cseq) { nf_ct_helper_log(skb, ct, "cannot get cseq"); |
30f33e6de [NETFILTER]: nf_c... |
1403 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1404 |
} |
3b6b9fab4 netfilter: nf_con... |
1405 |
matchend = matchoff + matchlen + 1; |
30f33e6de [NETFILTER]: nf_c... |
1406 1407 |
for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) { |
66bf79182 netfilter: nf_con... |
1408 |
const struct sip_handler *handler; |
30f33e6de [NETFILTER]: nf_c... |
1409 1410 1411 |
handler = &sip_handlers[i]; if (handler->response == NULL) continue; |
3b6b9fab4 netfilter: nf_con... |
1412 1413 |
if (*datalen < matchend + handler->len || strnicmp(*dptr + matchend, handler->method, handler->len)) |
30f33e6de [NETFILTER]: nf_c... |
1414 |
continue; |
051966c0c netfilter: nf_nat... |
1415 |
return handler->response(skb, protoff, dataoff, dptr, datalen, |
3b6b9fab4 netfilter: nf_con... |
1416 |
cseq, code); |
30f33e6de [NETFILTER]: nf_c... |
1417 1418 1419 |
} return NF_ACCEPT; } |
051966c0c netfilter: nf_nat... |
1420 1421 |
static int process_sip_request(struct sk_buff *skb, unsigned int protoff, unsigned int dataoff, |
30f33e6de [NETFILTER]: nf_c... |
1422 1423 |
const char **dptr, unsigned int *datalen) { |
30f33e6de [NETFILTER]: nf_c... |
1424 1425 |
enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
7266507d8 netfilter: nf_ct_... |
1426 1427 |
struct nf_ct_sip_master *ct_sip_info = nfct_help_data(ct); enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
30f33e6de [NETFILTER]: nf_c... |
1428 1429 |
unsigned int matchoff, matchlen; unsigned int cseq, i; |
7266507d8 netfilter: nf_ct_... |
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 |
union nf_inet_addr addr; __be16 port; /* Many Cisco IP phones use a high source port for SIP requests, but * listen for the response on port 5060. If we are the local * router for one of these phones, save the port number from the * Via: header so that nf_nat_sip can redirect the responses to * the correct port. */ if (ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen, SIP_HDR_VIA_UDP, NULL, &matchoff, &matchlen, &addr, &port) > 0 && port != ct->tuplehash[dir].tuple.src.u.udp.port && nf_inet_addr_cmp(&addr, &ct->tuplehash[dir].tuple.src.u3)) ct_sip_info->forced_dport = port; |
30f33e6de [NETFILTER]: nf_c... |
1445 1446 |
for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) { |
66bf79182 netfilter: nf_con... |
1447 |
const struct sip_handler *handler; |
30f33e6de [NETFILTER]: nf_c... |
1448 1449 1450 1451 1452 1453 1454 1455 |
handler = &sip_handlers[i]; if (handler->request == NULL) continue; if (*datalen < handler->len || strnicmp(*dptr, handler->method, handler->len)) continue; if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ, |
b20ab9cc6 netfilter: nf_ct_... |
1456 1457 |
&matchoff, &matchlen) <= 0) { nf_ct_helper_log(skb, ct, "cannot parse cseq"); |
30f33e6de [NETFILTER]: nf_c... |
1458 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1459 |
} |
30f33e6de [NETFILTER]: nf_c... |
1460 |
cseq = simple_strtoul(*dptr + matchoff, NULL, 10); |
b20ab9cc6 netfilter: nf_ct_... |
1461 1462 |
if (!cseq) { nf_ct_helper_log(skb, ct, "cannot get cseq"); |
30f33e6de [NETFILTER]: nf_c... |
1463 |
return NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1464 |
} |
30f33e6de [NETFILTER]: nf_c... |
1465 |
|
051966c0c netfilter: nf_nat... |
1466 1467 |
return handler->request(skb, protoff, dataoff, dptr, datalen, cseq); |
30f33e6de [NETFILTER]: nf_c... |
1468 1469 1470 |
} return NF_ACCEPT; } |
7d3dd043b [NETFILTER]: nf_c... |
1471 |
|
f5b321bd3 netfilter: nf_con... |
1472 |
static int process_sip_msg(struct sk_buff *skb, struct nf_conn *ct, |
051966c0c netfilter: nf_nat... |
1473 1474 |
unsigned int protoff, unsigned int dataoff, const char **dptr, unsigned int *datalen) |
f5b321bd3 netfilter: nf_con... |
1475 1476 1477 1478 1479 |
{ typeof(nf_nat_sip_hook) nf_nat_sip; int ret; if (strnicmp(*dptr, "SIP/2.0 ", strlen("SIP/2.0 ")) != 0) |
051966c0c netfilter: nf_nat... |
1480 |
ret = process_sip_request(skb, protoff, dataoff, dptr, datalen); |
f5b321bd3 netfilter: nf_con... |
1481 |
else |
051966c0c netfilter: nf_nat... |
1482 |
ret = process_sip_response(skb, protoff, dataoff, dptr, datalen); |
f5b321bd3 netfilter: nf_con... |
1483 |
|
9a6648210 netfilter: nf_nat... |
1484 |
if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) { |
f5b321bd3 netfilter: nf_con... |
1485 |
nf_nat_sip = rcu_dereference(nf_nat_sip_hook); |
051966c0c netfilter: nf_nat... |
1486 |
if (nf_nat_sip && !nf_nat_sip(skb, protoff, dataoff, |
b20ab9cc6 netfilter: nf_ct_... |
1487 1488 |
dptr, datalen)) { nf_ct_helper_log(skb, ct, "cannot NAT SIP message"); |
f5b321bd3 netfilter: nf_con... |
1489 |
ret = NF_DROP; |
b20ab9cc6 netfilter: nf_ct_... |
1490 |
} |
f5b321bd3 netfilter: nf_con... |
1491 1492 1493 1494 1495 1496 1497 |
} return ret; } static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
9fafcd7b2 [NETFILTER]: nf_c... |
1498 |
{ |
f5b321bd3 netfilter: nf_con... |
1499 |
struct tcphdr *th, _tcph; |
9fafcd7b2 [NETFILTER]: nf_c... |
1500 |
unsigned int dataoff, datalen; |
f5b321bd3 netfilter: nf_con... |
1501 1502 1503 1504 |
unsigned int matchoff, matchlen, clen; unsigned int msglen, origlen; const char *dptr, *end; s16 diff, tdiff = 0; |
7874896a2 netfilter: nf_ct_... |
1505 |
int ret = NF_ACCEPT; |
e6e4d9ed1 netfilter: nf_ct_... |
1506 |
bool term; |
48f8ac265 netfilter: nf_nat... |
1507 |
typeof(nf_nat_sip_seq_adjust_hook) nf_nat_sip_seq_adjust; |
f5b321bd3 netfilter: nf_con... |
1508 1509 |
if (ctinfo != IP_CT_ESTABLISHED && |
fb0488337 netfilter: add mo... |
1510 |
ctinfo != IP_CT_ESTABLISHED_REPLY) |
f5b321bd3 netfilter: nf_con... |
1511 |
return NF_ACCEPT; |
9fafcd7b2 [NETFILTER]: nf_c... |
1512 1513 |
/* No Data ? */ |
f5b321bd3 netfilter: nf_con... |
1514 1515 1516 1517 |
th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); if (th == NULL) return NF_ACCEPT; dataoff = protoff + th->doff * 4; |
3db05fea5 [NETFILTER]: Repl... |
1518 |
if (dataoff >= skb->len) |
9fafcd7b2 [NETFILTER]: nf_c... |
1519 |
return NF_ACCEPT; |
3db05fea5 [NETFILTER]: Repl... |
1520 |
nf_ct_refresh(ct, skb, sip_timeout * HZ); |
9fafcd7b2 [NETFILTER]: nf_c... |
1521 |
|
a1d7c1b4b netfilter: nf_ct_... |
1522 1523 |
if (unlikely(skb_linearize(skb))) return NF_DROP; |
9fafcd7b2 [NETFILTER]: nf_c... |
1524 |
|
f5b321bd3 netfilter: nf_con... |
1525 |
dptr = skb->data + dataoff; |
3db05fea5 [NETFILTER]: Repl... |
1526 |
datalen = skb->len - dataoff; |
779382eb3 [NETFILTER]: nf_c... |
1527 |
if (datalen < strlen("SIP/2.0 200")) |
7d3dd043b [NETFILTER]: nf_c... |
1528 |
return NF_ACCEPT; |
9fafcd7b2 [NETFILTER]: nf_c... |
1529 |
|
f5b321bd3 netfilter: nf_con... |
1530 1531 1532 1533 1534 |
while (1) { if (ct_sip_get_header(ct, dptr, 0, datalen, SIP_HDR_CONTENT_LENGTH, &matchoff, &matchlen) <= 0) break; |
33cb1e9a9 [NETFILTER]: nf_c... |
1535 |
|
f5b321bd3 netfilter: nf_con... |
1536 1537 1538 |
clen = simple_strtoul(dptr + matchoff, (char **)&end, 10); if (dptr + matchoff == end) break; |
e6e4d9ed1 netfilter: nf_ct_... |
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 |
term = false; for (; end + strlen("\r \r ") <= dptr + datalen; end++) { if (end[0] == '\r' && end[1] == ' ' && end[2] == '\r' && end[3] == ' ') { term = true; break; } } if (!term) |
f5b321bd3 netfilter: nf_con... |
1552 1553 1554 1555 1556 1557 |
break; end += strlen("\r \r ") + clen; msglen = origlen = end - dptr; |
3a7b21eaf netfilter: nf_ct_... |
1558 1559 |
if (msglen > datalen) return NF_ACCEPT; |
f5b321bd3 netfilter: nf_con... |
1560 |
|
051966c0c netfilter: nf_nat... |
1561 1562 |
ret = process_sip_msg(skb, ct, protoff, dataoff, &dptr, &msglen); |
b20ab9cc6 netfilter: nf_ct_... |
1563 |
/* process_sip_* functions report why this packet is dropped */ |
f5b321bd3 netfilter: nf_con... |
1564 1565 1566 1567 1568 1569 1570 1571 |
if (ret != NF_ACCEPT) break; diff = msglen - origlen; tdiff += diff; dataoff += msglen; dptr += msglen; datalen = datalen + diff - msglen; |
33cb1e9a9 [NETFILTER]: nf_c... |
1572 |
} |
9a6648210 netfilter: nf_nat... |
1573 |
if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) { |
48f8ac265 netfilter: nf_nat... |
1574 1575 |
nf_nat_sip_seq_adjust = rcu_dereference(nf_nat_sip_seq_adjust_hook); if (nf_nat_sip_seq_adjust) |
9a6648210 netfilter: nf_nat... |
1576 |
nf_nat_sip_seq_adjust(skb, protoff, tdiff); |
48f8ac265 netfilter: nf_nat... |
1577 |
} |
33cb1e9a9 [NETFILTER]: nf_c... |
1578 |
return ret; |
9fafcd7b2 [NETFILTER]: nf_c... |
1579 |
} |
f5b321bd3 netfilter: nf_con... |
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 |
static int sip_help_udp(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { unsigned int dataoff, datalen; const char *dptr; /* No Data ? */ dataoff = protoff + sizeof(struct udphdr); if (dataoff >= skb->len) return NF_ACCEPT; nf_ct_refresh(ct, skb, sip_timeout * HZ); |
a1d7c1b4b netfilter: nf_ct_... |
1592 1593 |
if (unlikely(skb_linearize(skb))) return NF_DROP; |
f5b321bd3 netfilter: nf_con... |
1594 1595 1596 1597 1598 |
dptr = skb->data + dataoff; datalen = skb->len - dataoff; if (datalen < strlen("SIP/2.0 200")) return NF_ACCEPT; |
051966c0c netfilter: nf_nat... |
1599 |
return process_sip_msg(skb, ct, protoff, dataoff, &dptr, &datalen); |
f5b321bd3 netfilter: nf_con... |
1600 1601 1602 |
} static struct nf_conntrack_helper sip[MAX_PORTS][4] __read_mostly; |
9fafcd7b2 [NETFILTER]: nf_c... |
1603 |
|
0f32a40fc [NETFILTER]: nf_c... |
1604 1605 |
static const struct nf_conntrack_expect_policy sip_exp_policy[SIP_EXPECT_MAX + 1] = { [SIP_EXPECT_SIGNALLING] = { |
b87921bdf netfilter: nf_con... |
1606 |
.name = "signalling", |
0f32a40fc [NETFILTER]: nf_c... |
1607 1608 1609 1610 |
.max_expected = 1, .timeout = 3 * 60, }, [SIP_EXPECT_AUDIO] = { |
b87921bdf netfilter: nf_con... |
1611 |
.name = "audio", |
a9c1d3591 [NETFILTER]: nf_c... |
1612 |
.max_expected = 2 * IP_CT_DIR_MAX, |
0f32a40fc [NETFILTER]: nf_c... |
1613 1614 |
.timeout = 3 * 60, }, |
0d0ab0378 [NETFILTER]: nf_c... |
1615 |
[SIP_EXPECT_VIDEO] = { |
b87921bdf netfilter: nf_con... |
1616 |
.name = "video", |
0d0ab0378 [NETFILTER]: nf_c... |
1617 1618 1619 |
.max_expected = 2 * IP_CT_DIR_MAX, .timeout = 3 * 60, }, |
9d288dffe netfilter: nf_con... |
1620 1621 1622 1623 1624 |
[SIP_EXPECT_IMAGE] = { .name = "image", .max_expected = IP_CT_DIR_MAX, .timeout = 3 * 60, }, |
6002f266b [NETFILTER]: nf_c... |
1625 |
}; |
9fafcd7b2 [NETFILTER]: nf_c... |
1626 1627 1628 1629 1630 |
static void nf_conntrack_sip_fini(void) { int i, j; for (i = 0; i < ports_c; i++) { |
f5b321bd3 netfilter: nf_con... |
1631 |
for (j = 0; j < ARRAY_SIZE(sip[i]); j++) { |
9fafcd7b2 [NETFILTER]: nf_c... |
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 |
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; |
9fafcd7b2 [NETFILTER]: nf_c... |
1642 1643 1644 1645 1646 1647 1648 1649 |
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; |
f5b321bd3 netfilter: nf_con... |
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 |
sip[i][0].tuple.dst.protonum = IPPROTO_UDP; sip[i][0].help = sip_help_udp; sip[i][1].tuple.src.l3num = AF_INET; sip[i][1].tuple.dst.protonum = IPPROTO_TCP; sip[i][1].help = sip_help_tcp; sip[i][2].tuple.src.l3num = AF_INET6; sip[i][2].tuple.dst.protonum = IPPROTO_UDP; sip[i][2].help = sip_help_udp; sip[i][3].tuple.src.l3num = AF_INET6; sip[i][3].tuple.dst.protonum = IPPROTO_TCP; sip[i][3].help = sip_help_tcp; for (j = 0; j < ARRAY_SIZE(sip[i]); j++) { |
1afc56794 netfilter: nf_ct_... |
1664 |
sip[i][j].data_len = sizeof(struct nf_ct_sip_master); |
9fafcd7b2 [NETFILTER]: nf_c... |
1665 |
sip[i][j].tuple.src.u.udp.port = htons(ports[i]); |
0f32a40fc [NETFILTER]: nf_c... |
1666 1667 |
sip[i][j].expect_policy = sip_exp_policy; sip[i][j].expect_class_max = SIP_EXPECT_MAX; |
9fafcd7b2 [NETFILTER]: nf_c... |
1668 |
sip[i][j].me = THIS_MODULE; |
9fafcd7b2 [NETFILTER]: nf_c... |
1669 |
|
9fafcd7b2 [NETFILTER]: nf_c... |
1670 |
if (ports[i] == SIP_PORT) |
e9324b2ce netfilter: nf_ct_... |
1671 |
sprintf(sip[i][j].name, "sip"); |
9fafcd7b2 [NETFILTER]: nf_c... |
1672 |
else |
e9324b2ce netfilter: nf_ct_... |
1673 |
sprintf(sip[i][j].name, "sip-%u", i); |
9fafcd7b2 [NETFILTER]: nf_c... |
1674 |
|
0d53778e8 [NETFILTER]: Conv... |
1675 1676 |
pr_debug("port #%u: %u ", i, ports[i]); |
9fafcd7b2 [NETFILTER]: nf_c... |
1677 1678 1679 |
ret = nf_conntrack_helper_register(&sip[i][j]); if (ret) { |
654d0fbdc netfilter: cleanu... |
1680 1681 1682 |
printk(KERN_ERR "nf_ct_sip: failed to register" " helper for pf: %u port: %u ", |
9fafcd7b2 [NETFILTER]: nf_c... |
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 |
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); |