diff --git a/include/linux/netfilter_ipv4/ip_conntrack_sip.h b/include/linux/netfilter_ipv4/ip_conntrack_sip.h index 913dad66c0fb81b2cb1b954b4b1312c1ba94d586..2a15eb51fd6b885c8b25a2785b5a12dcb299812f 100644 --- a/include/linux/netfilter_ipv4/ip_conntrack_sip.h +++ b/include/linux/netfilter_ipv4/ip_conntrack_sip.h @@ -5,23 +5,15 @@ #define SIP_PORT 5060 #define SIP_TIMEOUT 3600 -#define POS_VIA 0 -#define POS_CONTACT 1 -#define POS_CONTENT 2 -#define POS_MEDIA 3 -#define POS_OWNER 4 -#define POS_CONNECTION 5 -#define POS_REQ_HEADER 6 -#define POS_SDP_HEADER 7 - -struct sip_header_nfo { - const char *lname; - const char *sname; - const char *ln_str; - size_t lnlen; - size_t snlen; - size_t ln_strlen; - int (*match_len)(const char *, const char *, int *); +enum sip_header_pos { + POS_REQ_HEADER, + POS_VIA, + POS_CONTACT, + POS_CONTENT, + POS_MEDIA, + POS_OWNER, + POS_CONNECTION, + POS_SDP_HEADER, }; extern unsigned int (*ip_nat_sip_hook)(struct sk_buff **pskb, @@ -36,7 +28,7 @@ extern unsigned int (*ip_nat_sdp_hook)(struct sk_buff **pskb, extern int ct_sip_get_info(const char *dptr, size_t dlen, unsigned int *matchoff, unsigned int *matchlen, - struct sip_header_nfo *hnfo); + enum sip_header_pos pos); extern int ct_sip_lnlen(const char *line, const char *limit); extern const char *ct_sip_search(const char *needle, const char *haystack, size_t needle_len, size_t haystack_len); diff --git a/net/ipv4/netfilter/ip_conntrack_sip.c b/net/ipv4/netfilter/ip_conntrack_sip.c index bf423db4ed4665ea661ae6bfe304f1e82ce48985..cc3176581667dcfef2837bd2122dc36943882931 100644 --- a/net/ipv4/netfilter/ip_conntrack_sip.c +++ b/net/ipv4/netfilter/ip_conntrack_sip.c @@ -52,20 +52,32 @@ unsigned int (*ip_nat_sdp_hook)(struct sk_buff **pskb, const char *dptr); EXPORT_SYMBOL_GPL(ip_nat_sdp_hook); -int ct_sip_get_info(const char *dptr, size_t dlen, - unsigned int *matchoff, - unsigned int *matchlen, - struct sip_header_nfo *hnfo); -EXPORT_SYMBOL_GPL(ct_sip_get_info); - - static int digits_len(const char *dptr, const char *limit, int *shift); static int epaddr_len(const char *dptr, const char *limit, int *shift); static int skp_digits_len(const char *dptr, const char *limit, int *shift); static int skp_epaddr_len(const char *dptr, const char *limit, int *shift); -struct sip_header_nfo ct_sip_hdrs[] = { - { /* Via header */ +struct sip_header_nfo { + const char *lname; + const char *sname; + const char *ln_str; + size_t lnlen; + size_t snlen; + size_t ln_strlen; + int (*match_len)(const char *, const char *, int *); +}; + +static struct sip_header_nfo ct_sip_hdrs[] = { + [POS_REQ_HEADER] = { /* SIP Requests headers */ + .lname = "sip:", + .lnlen = sizeof("sip:") - 1, + .sname = "sip:", + .snlen = sizeof("sip:") - 1, /* yes, i know.. ;) */ + .ln_str = "@", + .ln_strlen = sizeof("@") - 1, + .match_len = epaddr_len + }, + [POS_VIA] = { /* SIP Via header */ .lname = "Via:", .lnlen = sizeof("Via:") - 1, .sname = "\r\nv:", @@ -74,7 +86,7 @@ struct sip_header_nfo ct_sip_hdrs[] = { .ln_strlen = sizeof("UDP ") - 1, .match_len = epaddr_len, }, - { /* Contact header */ + [POS_CONTACT] = { /* SIP Contact header */ .lname = "Contact:", .lnlen = sizeof("Contact:") - 1, .sname = "\r\nm:", @@ -83,7 +95,7 @@ struct sip_header_nfo ct_sip_hdrs[] = { .ln_strlen = sizeof("sip:") - 1, .match_len = skp_epaddr_len }, - { /* Content length header */ + [POS_CONTENT] = { /* SIP Content length header */ .lname = "Content-Length:", .lnlen = sizeof("Content-Length:") - 1, .sname = "\r\nl:", @@ -92,7 +104,7 @@ struct sip_header_nfo ct_sip_hdrs[] = { .ln_strlen = sizeof(":") - 1, .match_len = skp_digits_len }, - { /* SDP media info */ + [POS_MEDIA] = { /* SDP media info */ .lname = "\nm=", .lnlen = sizeof("\nm=") - 1, .sname = "\rm=", @@ -101,7 +113,7 @@ struct sip_header_nfo ct_sip_hdrs[] = { .ln_strlen = sizeof("audio ") - 1, .match_len = digits_len }, - { /* SDP owner address*/ + [POS_OWNER] = { /* SDP owner address*/ .lname = "\no=", .lnlen = sizeof("\no=") - 1, .sname = "\ro=", @@ -110,7 +122,7 @@ struct sip_header_nfo ct_sip_hdrs[] = { .ln_strlen = sizeof("IN IP4 ") - 1, .match_len = epaddr_len }, - { /* SDP connection info */ + [POS_CONNECTION] = { /* SDP connection info */ .lname = "\nc=", .lnlen = sizeof("\nc=") - 1, .sname = "\rc=", @@ -119,16 +131,7 @@ struct sip_header_nfo ct_sip_hdrs[] = { .ln_strlen = sizeof("IN IP4 ") - 1, .match_len = epaddr_len }, - { /* Requests headers */ - .lname = "sip:", - .lnlen = sizeof("sip:") - 1, - .sname = "sip:", - .snlen = sizeof("sip:") - 1, /* yes, i know.. ;) */ - .ln_str = "@", - .ln_strlen = sizeof("@") - 1, - .match_len = epaddr_len - }, - { /* SDP version header */ + [POS_SDP_HEADER] = { /* SDP version header */ .lname = "\nv=", .lnlen = sizeof("\nv=") - 1, .sname = "\rv=", @@ -138,7 +141,6 @@ struct sip_header_nfo ct_sip_hdrs[] = { .match_len = digits_len } }; -EXPORT_SYMBOL_GPL(ct_sip_hdrs); /* get line lenght until first CR or LF seen. */ int ct_sip_lnlen(const char *line, const char *limit) @@ -263,8 +265,9 @@ static int skp_epaddr_len(const char *dptr, const char *limit, int *shift) int ct_sip_get_info(const char *dptr, size_t dlen, unsigned int *matchoff, unsigned int *matchlen, - struct sip_header_nfo *hnfo) + enum sip_header_pos pos) { + struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos]; const char *limit, *aux, *k = dptr; int shift = 0; @@ -298,6 +301,7 @@ int ct_sip_get_info(const char *dptr, size_t dlen, 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 ip_conntrack *ct, @@ -393,7 +397,7 @@ static int sip_help(struct sk_buff **pskb, } /* Get ip and port address from SDP packet. */ if (ct_sip_get_info(dptr, datalen, &matchoff, &matchlen, - &ct_sip_hdrs[POS_CONNECTION]) > 0) { + POS_CONNECTION) > 0) { /* We'll drop only if there are parse problems. */ if (parse_ipaddr(dptr + matchoff, NULL, &ipaddr, @@ -402,7 +406,7 @@ static int sip_help(struct sk_buff **pskb, goto out; } if (ct_sip_get_info(dptr, datalen, &matchoff, &matchlen, - &ct_sip_hdrs[POS_MEDIA]) > 0) { + POS_MEDIA) > 0) { port = simple_strtoul(dptr + matchoff, NULL, 10); if (port < 1024) { diff --git a/net/ipv4/netfilter/ip_nat_sip.c b/net/ipv4/netfilter/ip_nat_sip.c index 9fad98099532214ec8a29a47fdebae12daddd77d..47097aac63d81ed8294b726dca2e1c4c2d040b6f 100644 --- a/net/ipv4/netfilter/ip_nat_sip.c +++ b/net/ipv4/netfilter/ip_nat_sip.c @@ -29,18 +29,16 @@ MODULE_DESCRIPTION("SIP NAT helper"); #define DEBUGP(format, args...) #endif -extern struct sip_header_nfo ct_sip_hdrs[]; - static unsigned int mangle_sip_packet(struct sk_buff **pskb, enum ip_conntrack_info ctinfo, struct ip_conntrack *ct, const char **dptr, size_t dlen, char *buffer, int bufflen, - struct sip_header_nfo *hnfo) + enum sip_header_pos pos) { unsigned int matchlen, matchoff; - if (ct_sip_get_info(*dptr, dlen, &matchoff, &matchlen, hnfo) <= 0) + if (ct_sip_get_info(*dptr, dlen, &matchoff, &matchlen, pos) <= 0) return 0; if (!ip_nat_mangle_udp_packet(pskb, ct, ctinfo, @@ -80,14 +78,13 @@ static unsigned int ip_nat_sip(struct sk_buff **pskb, if ((ctinfo) < IP_CT_IS_REPLY) { mangle_sip_packet(pskb, ctinfo, ct, dptr, (*pskb)->len - dataoff, - buffer, bufflen, - &ct_sip_hdrs[POS_CONTACT]); + buffer, bufflen, POS_CONTACT); return 1; } if (!mangle_sip_packet(pskb, ctinfo, ct, dptr, (*pskb)->len - dataoff, - buffer, bufflen, &ct_sip_hdrs[POS_VIA])) + buffer, bufflen, POS_VIA)) return 0; /* This search should ignore case, but later.. */ @@ -102,25 +99,24 @@ static unsigned int ip_nat_sip(struct sk_buff **pskb, return mangle_sip_packet(pskb, ctinfo, ct, dptr, (*pskb)->len - dataoff, - buffer, bufflen, - &ct_sip_hdrs[POS_CONTACT]); + buffer, bufflen, POS_CONTACT); } if ((ctinfo) < IP_CT_IS_REPLY) { if (!mangle_sip_packet(pskb, ctinfo, ct, dptr, (*pskb)->len - dataoff, - buffer, bufflen, &ct_sip_hdrs[POS_VIA])) + buffer, bufflen, POS_VIA)) return 0; /* Mangle Contact if exists only. - watch udp_nat_mangle()! */ mangle_sip_packet(pskb, ctinfo, ct, dptr, (*pskb)->len - dataoff, - buffer, bufflen, &ct_sip_hdrs[POS_CONTACT]); + buffer, bufflen, POS_CONTACT); return 1; } /* This mangle requests headers. */ return mangle_sip_packet(pskb, ctinfo, ct, dptr, ct_sip_lnlen(*dptr, *dptr + (*pskb)->len - dataoff), - buffer, bufflen, &ct_sip_hdrs[POS_REQ_HEADER]); + buffer, bufflen, POS_REQ_HEADER); } static int mangle_content_len(struct sk_buff **pskb, @@ -136,7 +132,7 @@ static int mangle_content_len(struct sk_buff **pskb, /* Get actual SDP lenght */ if (ct_sip_get_info(dptr, (*pskb)->len - dataoff, &matchoff, - &matchlen, &ct_sip_hdrs[POS_SDP_HEADER]) > 0) { + &matchlen, POS_SDP_HEADER) > 0) { /* since ct_sip_get_info() give us a pointer passing 'v=' we need to add 2 bytes in this count. */ @@ -144,7 +140,7 @@ static int mangle_content_len(struct sk_buff **pskb, /* Now, update SDP lenght */ if (ct_sip_get_info(dptr, (*pskb)->len - dataoff, &matchoff, - &matchlen, &ct_sip_hdrs[POS_CONTENT]) > 0) { + &matchlen, POS_CONTENT) > 0) { bufflen = sprintf(buffer, "%u", c_len); @@ -170,17 +166,17 @@ static unsigned int mangle_sdp(struct sk_buff **pskb, /* Mangle owner and contact info. */ bufflen = sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(newip)); if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff, - buffer, bufflen, &ct_sip_hdrs[POS_OWNER])) + buffer, bufflen, POS_OWNER)) return 0; if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff, - buffer, bufflen, &ct_sip_hdrs[POS_CONNECTION])) + buffer, bufflen, POS_CONNECTION)) return 0; /* Mangle media port. */ bufflen = sprintf(buffer, "%u", port); if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff, - buffer, bufflen, &ct_sip_hdrs[POS_MEDIA])) + buffer, bufflen, POS_MEDIA)) return 0; return mangle_content_len(pskb, ctinfo, ct, dptr);