diff options
Diffstat (limited to 'src/sccp_user.c')
| -rw-r--r-- | src/sccp_user.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/sccp_user.c b/src/sccp_user.c index 8a98e46..63eba2a 100644 --- a/src/sccp_user.c +++ b/src/sccp_user.c @@ -293,6 +293,124 @@ bool osmo_sccp_check_addr(struct osmo_sccp_addr *addr, uint32_t presence) return true; } +/*! Compare two SCCP Global Titles. + * \param[in] a left side. + * \param[in] b right side. + * \return -1 if a < b, 1 if a > b, and 0 if a == b. + */ +int osmo_sccp_gt_cmp(const struct osmo_sccp_gt *a, const struct osmo_sccp_gt *b) +{ + if (a == b) + return 0; + if (!a) + return -1; + if (!b) + return 1; + return memcmp(a, b, sizeof(*a)); +} + +/*! Compare two SCCP addresses by given presence criteria. + * Any OSMO_SCCP_ADDR_T_* type not set in presence_criteria is ignored. + * In case all bits are set in presence_criteria, the comparison is in the order of: + * OSMO_SCCP_ADDR_T_GT, OSMO_SCCP_ADDR_T_PC, OSMO_SCCP_ADDR_T_IPv4, OSMO_SCCP_ADDR_T_IPv6, OSMO_SCCP_ADDR_T_SSN. + * The SCCP addresses' Routing Indicator is not compared, see osmo_sccp_addr_ri_cmp(). + * \param[in] a left side. + * \param[in] b right side. + * \param[in] presence_criteria A bitmask of OSMO_SCCP_ADDR_T_* values, or 0xffffffff to compare all parts, except the + * routing indicator. + * \return -1 if a < b, 1 if a > b, and 0 if all checked values match. + */ +int osmo_sccp_addr_cmp(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b, uint32_t presence_criteria) +{ + int rc; + if (a == b) + return 0; + if (!a) + return -1; + if (!b) + return 1; + + if (presence_criteria & OSMO_SCCP_ADDR_T_GT) { + if ((a->presence & OSMO_SCCP_ADDR_T_GT) != (b->presence & OSMO_SCCP_ADDR_T_GT)) + return (b->presence & OSMO_SCCP_ADDR_T_GT) ? -1 : 1; + rc = osmo_sccp_gt_cmp(&a->gt, &b->gt); + if (rc) + return rc; + } + + if (presence_criteria & OSMO_SCCP_ADDR_T_PC) { + if ((a->presence & OSMO_SCCP_ADDR_T_PC) != (b->presence & OSMO_SCCP_ADDR_T_PC)) + return (b->presence & OSMO_SCCP_ADDR_T_PC) ? -1 : 1; + + if ((a->presence & OSMO_SCCP_ADDR_T_PC) + && a->pc != b->pc) + return (a->pc < b->pc)? -1 : 1; + } + + if (presence_criteria & OSMO_SCCP_ADDR_T_IPv4) { + if ((a->presence & OSMO_SCCP_ADDR_T_IPv4) != (b->presence & OSMO_SCCP_ADDR_T_IPv4)) + return (b->presence & OSMO_SCCP_ADDR_T_IPv4) ? -1 : 1; + rc = memcmp(&a->ip.v4, &b->ip.v4, sizeof(a->ip.v4)); + if (rc) + return rc; + } + + if (presence_criteria & OSMO_SCCP_ADDR_T_IPv6) { + if ((a->presence & OSMO_SCCP_ADDR_T_IPv6) != (b->presence & OSMO_SCCP_ADDR_T_IPv6)) + return (b->presence & OSMO_SCCP_ADDR_T_IPv6) ? -1 : 1; + rc = memcmp(&a->ip.v6, &b->ip.v6, sizeof(a->ip.v6)); + if (rc) + return rc; + } + + if (presence_criteria & OSMO_SCCP_ADDR_T_SSN) { + if ((a->presence & OSMO_SCCP_ADDR_T_SSN) != (b->presence & OSMO_SCCP_ADDR_T_SSN)) + return (b->presence & OSMO_SCCP_ADDR_T_SSN) ? -1 : 1; + if (a->ssn != b->ssn) + return (a->ssn < b->ssn) ? -1 : 1; + } + + return 0; +} + +/*! Compare the routing information of two SCCP addresses. + * Compare the ri of a and b, and, if equal, return osmo_sccp_addr_cmp() with presence criteria selected according to + * ri. + * \param[in] a left side. + * \param[in] b right side. + * \return -1 if a < b, 1 if a > b, and 0 if a == b. + */ +int osmo_sccp_addr_ri_cmp(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b) +{ + uint32_t presence_criteria; + if (a == b) + return 0; + if (!a) + return -1; + if (!b) + return 1; + if (a->ri != b->ri) + return (a->ri < b->ri) ? -1 : 1; + switch (a->ri) { + case OSMO_SCCP_RI_NONE: + return 0; + case OSMO_SCCP_RI_GT: + presence_criteria = OSMO_SCCP_ADDR_T_GT; + break; + case OSMO_SCCP_RI_SSN_PC: + presence_criteria = OSMO_SCCP_ADDR_T_SSN | OSMO_SCCP_ADDR_T_PC; + break; + case OSMO_SCCP_RI_SSN_IP: + /* Pick IPv4 or v6 depending on what a->presence indicates. */ + presence_criteria = OSMO_SCCP_ADDR_T_SSN | (a->presence & (OSMO_SCCP_ADDR_T_IPv4 | OSMO_SCCP_ADDR_T_IPv6)); + break; + default: + return 0; + } + + return osmo_sccp_addr_cmp(a, b, presence_criteria); +} + /*! Compose a human readable string to describe the SCCP user's connection. * The output follows ['<scu.name>':]<local-sccp-addr>, e.g. "'OsmoHNBW':RI=SSN_PC,PC=0.23.5,SSN=RANAP", * or just "RI=SSN_PC,PC=0.23.5,SSN=RANAP" if no scu->name is set. |