laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-iuh/+/26857 )

Change subject: iu_helpers: add function ranap_transp_layer_addr_decode2 ......................................................................

iu_helpers: add function ranap_transp_layer_addr_decode2

Add ranap_transp_layer_addr_decode2 as AF agnostic version of ranap_transp_layer_addr_decode.

Change-Id: Ia60e0ab671fc4185815a880377ab88fcf1b30ac9 --- M include/osmocom/ranap/iu_helpers.h M src/iu_helpers.c M src/tests/test-helpers.c M src/tests/test-helpers.ok 4 files changed, 122 insertions(+), 0 deletions(-)

Approvals: laforge: Looks good to me, approved pespin: Looks good to me, but someone else must approve Jenkins Builder: Verified

diff --git a/include/osmocom/ranap/iu_helpers.h b/include/osmocom/ranap/iu_helpers.h index d824646..bf2a580 100644 --- a/include/osmocom/ranap/iu_helpers.h +++ b/include/osmocom/ranap/iu_helpers.h @@ -15,6 +15,8 @@ int ranap_transp_assoc_decode(uint16_t *port, const RANAP_IuTransportAssociation_t *transp_assoc); int ranap_transp_layer_addr_decode(char *addr, unsigned int addr_len, const RANAP_TransportLayerAddress_t *trasp_layer_addr); +int ranap_transp_layer_addr_decode2(struct osmo_sockaddr *addr, bool *uses_x213_nsap, + const RANAP_TransportLayerAddress_t *trasp_layer_addr); RANAP_TransportLayerInformation_t *ranap_new_transp_info_rtp(struct osmo_sockaddr *addr, bool use_x213_nsap); RANAP_TransportLayerInformation_t *ranap_new_transp_info_gtp(struct osmo_sockaddr *addr, uint32_t tei, bool use_x213_nsap); diff --git a/src/iu_helpers.c b/src/iu_helpers.c index 62f5c22..1591f7d 100644 --- a/src/iu_helpers.c +++ b/src/iu_helpers.c @@ -126,6 +126,56 @@ return 0; }

+/* (same as ranap_transp_layer_addr_decode, but AF agnostic) */ +int ranap_transp_layer_addr_decode2(struct osmo_sockaddr *addr, bool *uses_x213_nsap, + const RANAP_TransportLayerAddress_t *trasp_layer_addr) +{ + unsigned char *buf; + int len; + bool x213_nsap = false; + uint16_t icp; + + buf = trasp_layer_addr->buf; + len = trasp_layer_addr->size; + + memset(addr, 0, sizeof(*addr)); + + if (len == 20 && buf[0] == 0x35) { + /* For an X.213 NSAP encoded address we expect a buffer of exactly 20 bytes (3 bytes IDP + 17 bytes + * DSP). we also expect AFI = 0x35, which means that two byte IDI and an IP address follows. (see also + * comments in function new_transp_layer_addr below) */ + x213_nsap = true; + icp = osmo_load16be(&buf[1]); + switch (icp) { + case 0x0000: + addr->u.sa.sa_family = AF_INET6; + memcpy(addr->u.sin6.sin6_addr.s6_addr, buf + 3, sizeof(addr->u.sin6.sin6_addr.s6_addr)); + break; + case 0x0001: + addr->u.sa.sa_family = AF_INET; + memcpy((uint8_t *) &addr->u.sin.sin_addr.s_addr, buf + 3, sizeof(addr->u.sin.sin_addr.s_addr)); + break; + default: + return -EINVAL; + } + } else if (len == 4) { + /* A non X.213 NSAP encoded IPv4 address is 4 bytes long */ + addr->u.sa.sa_family = AF_INET; + memcpy((uint8_t *) &addr->u.sin.sin_addr.s_addr, buf, sizeof(addr->u.sin.sin_addr.s_addr)); + } else if (len == 16) { + /* A non X.213 NSAP encoded IPv6 address is 16 bytes long */ + addr->u.sa.sa_family = AF_INET6; + memcpy(addr->u.sin6.sin6_addr.s6_addr, buf, sizeof(addr->u.sin6.sin6_addr.s6_addr)); + } else + return -EINVAL; + + /* In case the caller is interested in the encoding method that was used */ + if (uses_x213_nsap) + *uses_x213_nsap = x213_nsap; + + return 0; +} + static int new_transp_layer_addr(BIT_STRING_t *out, struct osmo_sockaddr *addr, bool use_x213_nsap) { uint8_t *buf; diff --git a/src/tests/test-helpers.c b/src/tests/test-helpers.c index 5b5004a..42e8b26 100644 --- a/src/tests/test-helpers.c +++ b/src/tests/test-helpers.c @@ -29,6 +29,7 @@

#include <osmocom/core/utils.h> #include <osmocom/core/socket.h> +#include <osmocom/core/sockaddr_str.h> #include <osmocom/gsm/gsm48.h>

#include <osmocom/ranap/RANAP_LAI.h> @@ -347,6 +348,65 @@ OSMO_ASSERT(rc == 0); }

+void test_ranap_transp_layer_addr_decode2(void) +{ + int rc; + struct osmo_sockaddr addr; + struct osmo_sockaddr_str sockaddr_str; + bool uses_x213_nsap; + RANAP_TransportLayerAddress_t trasp_layer_addr = { 0 }; + uint8_t encoded_ipv4_addr_x213_nsap[] = { + 0x35, 0x00, 0x01, 0x01, 0x02, 0x03, 0x04, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00 }; + uint8_t encoded_ipv4_addr[] = { 0x01, 0x02, 0x03, 0x04 }; + uint8_t encoded_ipv6_addr_x213_nsap[] = { + 0x35, 0x00, 0x00, 0xf1, 0x1f, 0xf2, 0x2f, 0xf3, + 0x3f, 0xf4, 0x4f, 0xf5, 0x5f, 0xf6, 0x6f, 0xf7, + 0x7f, 0xf8, 0x8f, 0x00 }; + uint8_t encoded_ipv6_addr[] = { + 0xf1, 0x1f, 0xf2, 0x2f, 0xf3, 0x3f, 0xf4, 0x4f, + 0xf5, 0x5f, 0xf6, 0x6f, 0xf7, 0x7f, 0xf8, 0x8f }; + + printf("Testing function ranap_transp_layer_addr_decode2()\n"); + + printf(" ipv4, x213_nsap\n"); + trasp_layer_addr.buf = encoded_ipv4_addr_x213_nsap; + trasp_layer_addr.size = sizeof(encoded_ipv4_addr_x213_nsap); + rc = ranap_transp_layer_addr_decode2(&addr, &uses_x213_nsap, &trasp_layer_addr); + OSMO_ASSERT(rc == 0); + memset(&sockaddr_str, 0, sizeof(sockaddr_str)); + osmo_sockaddr_str_from_sockaddr_in(&sockaddr_str, &addr.u.sin); + printf(" addr=%s, af=%d, x213_nsap=%u\n", sockaddr_str.ip, sockaddr_str.af, uses_x213_nsap); + + printf(" ipv4\n"); + trasp_layer_addr.buf = encoded_ipv4_addr; + trasp_layer_addr.size = sizeof(encoded_ipv4_addr); + rc = ranap_transp_layer_addr_decode2(&addr, &uses_x213_nsap, &trasp_layer_addr); + OSMO_ASSERT(rc == 0); + memset(&sockaddr_str, 0, sizeof(sockaddr_str)); + osmo_sockaddr_str_from_sockaddr_in(&sockaddr_str, &addr.u.sin); + printf(" addr=%s, af=%d, x213_nsap=%u\n", sockaddr_str.ip, sockaddr_str.af, uses_x213_nsap); + + printf(" ipv6, x213_nsap\n"); + trasp_layer_addr.buf = encoded_ipv6_addr_x213_nsap; + trasp_layer_addr.size = sizeof(encoded_ipv6_addr_x213_nsap); + rc = ranap_transp_layer_addr_decode2(&addr, &uses_x213_nsap, &trasp_layer_addr); + OSMO_ASSERT(rc == 0); + memset(&sockaddr_str, 0, sizeof(sockaddr_str)); + osmo_sockaddr_str_from_sockaddr_in6(&sockaddr_str, &addr.u.sin6); + printf(" addr=%s, af=%d, x213_nsap=%u\n", sockaddr_str.ip, sockaddr_str.af, uses_x213_nsap); + + printf(" ipv6\n"); + trasp_layer_addr.buf = encoded_ipv6_addr; + trasp_layer_addr.size = sizeof(encoded_ipv6_addr); + rc = ranap_transp_layer_addr_decode2(&addr, &uses_x213_nsap, &trasp_layer_addr); + OSMO_ASSERT(rc == 0); + memset(&sockaddr_str, 0, sizeof(sockaddr_str)); + osmo_sockaddr_str_from_sockaddr_in6(&sockaddr_str, &addr.u.sin6); + printf(" addr=%s, af=%d, x213_nsap=%u\n", sockaddr_str.ip, sockaddr_str.af, uses_x213_nsap); +} + int main(int argc, char **argv) { asn1_xer_print = 0; @@ -360,6 +420,7 @@ test_ranap_new_transp_info_gtp(); test_ranap_new_transp_info_rtp(); test_ranap_transp_layer_addr_decode(); + test_ranap_transp_layer_addr_decode2();

test_common_cleanup(); return 0; diff --git a/src/tests/test-helpers.ok b/src/tests/test-helpers.ok index fe08287..0626413 100644 --- a/src/tests/test-helpers.ok +++ b/src/tests/test-helpers.ok @@ -56,3 +56,12 @@ addr=1.2.3.4 ipv4 addr=1.2.3.4 +Testing function ranap_transp_layer_addr_decode2() + ipv4, x213_nsap + addr=1.2.3.4, af=2, x213_nsap=1 + ipv4 + addr=1.2.3.4, af=2, x213_nsap=0 + ipv6, x213_nsap + addr=f11f:f22f:f33f:f44f:f55f:f66f:f77f:f88f, af=10, x213_nsap=1 + ipv6 + addr=f11f:f22f:f33f:f44f:f55f:f66f:f77f:f88f, af=10, x213_nsap=0