From dd59a11667645e21ea1c0b563dda52324adc6249 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Mon, 3 Apr 2017 19:25:45 +0200 Subject: [PATCH] sua: Extend address parsing with GT, RI and IPv4 support Change-Id: I186df77cbdbedfe1a60b855be3626b6766f4681c --- src/sua.c | 130 +++++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 104 insertions(+), 26 deletions(-) diff --git a/src/sua.c b/src/sua.c index 659104c2..0be5467a 100644 --- a/src/sua.c +++ b/src/sua.c @@ -692,11 +692,51 @@ int osmo_sua_user_link_down(struct osmo_sccp_link *link, struct osmo_prim_hdr *o * Receiving SUA messsages from SCTP ***********************************************************************/ -static int sua_parse_addr(struct osmo_sccp_addr *out, - struct xua_msg *xua, - uint16_t iei) +/*! \brief Decode SUA Global Title according to RFC3868 Section 3.10.2.3 + * \param[out] gt User-allocated structure for decoded output + * \param[in] data binary-encoded data + * \param[in] datalen length of \ref data in octets + */ +int sua_parse_gt(struct osmo_sccp_gt *gt, const uint8_t *data, unsigned int datalen) +{ + uint8_t num_digits; + char *out_digits; + unsigned int i; + + /* 8 byte header at minimum, plus digits */ + if (datalen < 8) + return -EINVAL; + + /* parse header */ + gt->gti = data[3]; + num_digits = data[4]; + gt->tt = data[5]; + gt->npi = data[6]; + gt->nai = data[7]; + + /* parse digits */ + out_digits = gt->digits; + for (i = 0; i < datalen-8; i++) { + uint8_t byte = data[8+i]; + *out_digits++ = osmo_bcd2char(byte & 0x0F); + if (out_digits - gt->digits >= num_digits) + break; + *out_digits++ = osmo_bcd2char(byte >> 4); + if (out_digits - gt->digits >= num_digits) + break; + } + *out_digits++ = '\0'; + + return 0; +} + +/*! \brief parse SCCP address from given xUA message part + * \param[out] out caller-allocated decoded SCCP address struct + * \param[in] param xUA message part containing address + \returns 0 on success; negative on error */ +int sua_addr_parse_part(struct osmo_sccp_addr *out, + const struct xua_msg_part *param) { - const struct xua_msg_part *param = xua_msg_find_tag(xua, iei); const struct xua_parameter_hdr *par; uint16_t ri; uint16_t ai; @@ -704,16 +744,15 @@ static int sua_parse_addr(struct osmo_sccp_addr *out, uint16_t par_tag, par_len, par_datalen; uint32_t *p32; - if (!param) - return -ENODEV; + memset(out, 0, sizeof(*out)); - LOGP(DSUA, LOGL_DEBUG, "sua_parse_addr(IEI=%d) (%d) %s\n", - iei, param->len, + LOGP(DSUA, LOGL_DEBUG, "%s(IEI=0x%04x) (%d) %s\n", __func__, + param->tag, param->len, osmo_hexdump(param->dat, param->len)); if (param->len < 4) { - LOGP(DSUA, LOGL_ERROR, "SUA IEI %d: invalid address length: %d\n", - iei, param->len); + LOGP(DSUA, LOGL_ERROR, "SUA IEI 0x%04x: invalid address length: %d\n", + param->tag, param->len); return -EINVAL; } @@ -723,16 +762,29 @@ static int sua_parse_addr(struct osmo_sccp_addr *out, ai = ntohs(*(uint16_t*) ¶m->dat[pos]); pos += 2; - if (ri != SUA_RI_SSN_PC) { - LOGP(DSUA, LOGL_ERROR, "SUA IEI %d: Routing Indicator not supported yet: %d\n", - iei, ri); + switch (ri) { + case SUA_RI_GT: + out->ri = OSMO_SCCP_RI_GT; + break; + case SUA_RI_SSN_PC: + out->ri = OSMO_SCCP_RI_SSN_PC; + break; + case SUA_RI_SSN_IP: + out->ri = OSMO_SCCP_RI_SSN_IP; + break; + case SUA_RI_HOST: + default: + LOGP(DSUA, LOGL_ERROR, "SUA IEI 0x%04x: Routing Indicator not supported yet: %d\n", + param->tag, ri); return -ENOTSUP; } if (ai != 7) { - LOGP(DSUA, LOGL_ERROR, "SUA IEI %d: Address Indicator not supported yet: %x\n", - iei, ai); +#if 0 + LOGP(DSUA, LOGL_ERROR, "SUA IEI 0x%04x: Address Indicator not supported yet: %x\n", + param->tag, ai); return -ENOTSUP; +#endif } /* @@ -749,8 +801,8 @@ static int sua_parse_addr(struct osmo_sccp_addr *out, par_len = ntohs(par->len); par_datalen = par_len - sizeof(*par); - LOGP(DSUA, LOGL_DEBUG, "SUA IEI %hu pos %hu/%hu: subpart tag %hu, len %hu\n", - iei, pos, param->len, par->tag, par->len); + LOGP(DSUA, LOGL_DEBUG, "SUA IEI 0x%04x pos %hu/%hu: subpart tag 0x%04x, len %hu\n", + param->tag, pos, param->len, par_tag, par_len); switch (par_tag) { case SUA_IEI_PC: @@ -768,12 +820,22 @@ static int sua_parse_addr(struct osmo_sccp_addr *out, out->presence |= OSMO_SCCP_ADDR_T_SSN; break; case SUA_IEI_GT: - /* TODO */ + if (par_datalen < 8) + goto subpar_fail; + sua_parse_gt(&out->gt, par->data, par_datalen); out->presence |= OSMO_SCCP_ADDR_T_GT; break; + case SUA_IEI_IPv4: + if (par_datalen != 4) + goto subpar_fail; + p32 = (uint32_t*)par->data; + /* no endian conversion, both network order */ + out->ip.v4.s_addr = *p32; + out->presence |= OSMO_SCCP_ADDR_T_IPv4; + break; default: - LOGP(DSUA, LOGL_ERROR, "SUA IEI %d: Unknown subpart tag %hd\n", - iei, par_tag); + LOGP(DSUA, LOGL_ERROR, "SUA IEI 0x%04x: Unknown subpart tag %hd\n", + param->tag, par_tag); goto subpar_fail; } @@ -783,11 +845,27 @@ static int sua_parse_addr(struct osmo_sccp_addr *out, return 0; subpar_fail: - LOGP(DSUA, LOGL_ERROR, "Failed to parse subparts of address IEI=%d\n", - iei); + LOGP(DSUA, LOGL_ERROR, "Failed to parse subparts of address IEI=0x%04x\n", + param->tag); return -EINVAL; } +/*! \brief parse SCCP address from given xUA message IE + * \param[out] out caller-allocated decoded SCCP address struct + * \param[in] xua xUA message + * \param[in] iei Information Element Identifier inside \ref xua + \returns 0 on success; negative on error */ +int sua_addr_parse(struct osmo_sccp_addr *out, struct xua_msg *xua, uint16_t iei) +{ + const struct xua_msg_part *param = xua_msg_find_tag(xua, iei); + if (!param) { + memset(out, 0, sizeof(*out)); + return -ENODEV; + } + + return sua_addr_parse_part(out, param); +} + static int sua_rx_cldt(struct osmo_sccp_link *link, struct xua_msg *xua) { struct osmo_scu_prim *prim; @@ -802,8 +880,8 @@ static int sua_rx_cldt(struct osmo_sccp_link *link, struct xua_msg *xua) osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION, upmsg); - sua_parse_addr(¶m->called_addr, xua, SUA_IEI_DEST_ADDR); - sua_parse_addr(¶m->calling_addr, xua, SUA_IEI_SRC_ADDR); + sua_addr_parse(¶m->called_addr, xua, SUA_IEI_DEST_ADDR); + sua_addr_parse(¶m->calling_addr, xua, SUA_IEI_SRC_ADDR); param->in_sequence_control = xua_msg_get_u32(xua, SUA_IEI_SEQ_CTRL); protocol_class = xua_msg_get_u32(xua, SUA_IEI_PROTO_CLASS); param->return_option = protocol_class & 0x80; @@ -849,8 +927,8 @@ static int sua_rx_core(struct osmo_sccp_link *link, struct xua_msg *xua) /* fill conn */ conn = conn_create(link); - sua_parse_addr(&conn->called_addr, xua, SUA_IEI_DEST_ADDR); - sua_parse_addr(&conn->calling_addr, xua, SUA_IEI_SRC_ADDR); + sua_addr_parse(&conn->called_addr, xua, SUA_IEI_DEST_ADDR); + sua_addr_parse(&conn->calling_addr, xua, SUA_IEI_SRC_ADDR); conn->remote_ref = xua_msg_get_u32(xua, SUA_IEI_SRC_REF); /* fill primitive */