[sr-dev] git:master:9f3c45b8: ss7ops: Enable M2PA encapsulation in addition to M2UA

Module: kamailio Branch: master Commit: 9f3c45b8967510e9c81aeb433c2ec14bcd58295c URL: https://github.com/kamailio/kamailio/commit/9f3c45b8967510e9c81aeb433c2ec14… Author: Holger Hans Peter Freyther &lt;holger(a)moiji-mobile.com&gt; Committer: Holger Hans Peter Freyther &lt;holger(a)moiji-mobile.com&gt; Date: 2016-12-22T15:57:37+01:00 ss7ops: Enable M2PA encapsulation in addition to M2UA Add support for M2PA encapsulation on top of M2UA. It will only handle data messages as these can contain isup. --- Modified: src/modules/ss7ops/ss7ops_mod.c --- Diff: https://github.com/kamailio/kamailio/commit/9f3c45b8967510e9c81aeb433c2ec14… Patch: https://github.com/kamailio/kamailio/commit/9f3c45b8967510e9c81aeb433c2ec14… --- diff --git a/src/modules/ss7ops/ss7ops_mod.c b/src/modules/ss7ops/ss7ops_mod.c index cc9ddfb..ad2e448 100644 --- a/src/modules/ss7ops/ss7ops_mod.c +++ b/src/modules/ss7ops/ss7ops_mod.c @@ -29,12 +29,17 @@ MODULE_VERSION /* hep defines */ #define HEP_M2UA 0x08 +#define HEP_M2PA 0x0d /* M2UA messages */ #define M2UA_MSG 6 #define M2UA_DATA 1 #define M2UA_IE_DATA 0x0300 +/* M2PA messages */ +#define M2PA_CLASS 11 +#define M2PA_DATA 1 + /* MTPl3 */ #define MTP_ISUP 0x05 @@ -188,6 +193,65 @@ static const uint8_t *extract_from_m2ua(const uint8_t *data, size_t *len) return NULL; } +static const uint8_t *extract_from_m2pa(const uint8_t *data, size_t *len) +{ + uint32_t data_len; + + if (*len < 8) { + LM_ERR("M2PA hdr too short %zu\n", *len); + return NULL; + } + + /* check the header */ + if (data[0] != 0x01) { + LM_ERR("M2PA unknown version number %d\n", data[0]); + return NULL; + } + if (data[1] != 0x00) { + LM_ERR("M2PA unknown reserved fields %d\n", data[1]); + return NULL; + } + if (data[2] != M2PA_CLASS) { + LM_ERR("M2PA unhandled message class %d\n", data[2]); + return NULL; + } + if (data[3] != M2PA_DATA) { + LM_ERR("M2PA not data msg but %d\n", data[3]); + return NULL; + } + + /* check the length */ + memcpy(&data_len, &data[4], sizeof(data_len)); + data_len = ntohl(data_len); + if (*len < data_len) { + LM_ERR("M2PA data can't fit %zu vs. %u\n", *len, data_len); + return NULL; + } + + /* skip the header */ + data += 8; + data_len -= 8; + + /* BSN, FSN and then priority */ + if (data_len < 8) { + LM_ERR("M2PA no space for BSN/FSN %u\n", data_len); + return NULL; + } + data += 8; + data_len -= 8; + if (data_len == 0) + return NULL; + else if (data_len < 1) { + LM_ERR("M2PA no space for prio %u\n", data_len); + return NULL; + } + data += 1; + data_len -= 1; + + *len = data_len; + return data; +} + static const uint8_t *extract_from_mtp(const uint8_t *data, size_t *len, int *opc, int *dpc, int *type) { @@ -221,6 +285,9 @@ static const uint8_t *ss7_extract_payload(const uint8_t *data, size_t *len, return extract_from_mtp(extract_from_m2ua(data, len), len, opc, dpc, mtp_type); break; + case HEP_M2PA: + return extract_from_mtp(extract_from_m2pa(data, len), len, opc, + dpc, mtp_type); default: LM_ERR("Unknown HEP type %d/0x%c\n", proto, proto); return NULL;