mirror of
https://github.com/open5gs/open5gs.git
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329 lines
7.7 KiB
C
329 lines
7.7 KiB
C
#define TRACE_MODULE _gtp_path
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#include "core_debug.h"
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#include "core_pkbuf.h"
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#include "3gpp_types.h"
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#include "gtp_message.h"
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#include "gtp_conv.h"
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#include "gtp_node.h"
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#include "gtp_path.h"
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status_t gtp_server(sock_node_t *snode, sock_handler handler)
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{
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status_t rv;
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char buf[CORE_ADDRSTRLEN];
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d_assert(snode, return CORE_ERROR,);
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rv = udp_server(&snode->sock, snode->list);
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d_assert(rv == CORE_OK, return CORE_ERROR,);
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rv = sock_register(snode->sock, handler, NULL);
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d_assert(rv == CORE_OK, return CORE_ERROR,);
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d_trace(1, "gtp_server() [%s]:%d\n",
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CORE_ADDR(snode->list, buf), CORE_PORT(snode->list));
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return CORE_OK;
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}
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status_t gtp_client(gtp_node_t *gnode)
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{
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status_t rv;
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char buf[CORE_ADDRSTRLEN];
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d_assert(gnode, return CORE_ERROR,);
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rv = udp_client(&gnode->sock, gnode->sa_list);
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d_assert(rv == CORE_OK, return CORE_ERROR,);
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d_trace(1, "gtp_client() [%s]:%d\n",
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CORE_ADDR(gnode->sa_list, buf), CORE_PORT(gnode->sa_list));
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return CORE_OK;
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}
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status_t gtp_connect(sock_id ipv4, sock_id ipv6, gtp_node_t *gnode)
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{
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c_sockaddr_t *addr;
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char buf[CORE_ADDRSTRLEN];
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d_assert(ipv4 || ipv6, return CORE_ERROR,);
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d_assert(gnode, return CORE_ERROR,);
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d_assert(gnode->sa_list, return CORE_ERROR,);
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addr = gnode->sa_list;
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while(addr)
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{
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sock_id id;
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if (addr->c_sa_family == AF_INET) id = ipv4;
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else if (addr->c_sa_family == AF_INET6) id = ipv6;
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else
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d_assert(0, return CORE_ERROR,);
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if (id)
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{
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if (sock_connect(id, addr) == CORE_OK)
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{
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d_trace(1, "gtp_connect() [%s]:%d\n",
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CORE_ADDR(addr, buf), CORE_PORT(addr));
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gnode->sock = id;
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break;
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}
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}
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addr = addr->next;
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}
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if (addr == NULL)
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{
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d_warn("gtp_connect() [%s]:%d failed(%d:%s)",
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CORE_ADDR(gnode->sa_list, buf), CORE_PORT(gnode->sa_list),
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errno, strerror(errno));
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return CORE_ERROR;
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}
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return CORE_OK;
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}
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status_t gtp_server_list(list_t *list, sock_handler handler)
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{
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status_t rv;
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sock_node_t *snode = NULL;
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d_assert(list, return CORE_ERROR,);
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d_assert(handler, return CORE_ERROR,);
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for (snode = list_first(list); snode; snode = list_next(snode))
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{
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rv = gtp_server(snode, handler);
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d_assert(rv == CORE_OK, return CORE_ERROR,);
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}
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return CORE_OK;
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}
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sock_id gtp_local_sock_first(list_t *list)
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{
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sock_node_t *snode = NULL;
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sock_id sock = 0;
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d_assert(list, return 0,);
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for (snode = list_first(list); snode; snode = list_next(snode))
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{
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sock = snode->sock;
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if (sock) return sock;
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}
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return 0;
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}
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c_sockaddr_t *gtp_local_addr_first(list_t *list)
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{
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sock_node_t *snode = NULL;
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c_sockaddr_t *addr = NULL;
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d_assert(list, return NULL,);
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for (snode = list_first(list); snode; snode = list_next(snode))
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{
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addr = sock_local_addr(snode->sock);
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if (addr) return addr;
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}
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return NULL;
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}
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status_t gtp_recv(sock_id sock, pkbuf_t **pkbuf)
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{
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ssize_t size;
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d_assert(sock, return CORE_ERROR,);
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*pkbuf = pkbuf_alloc(0, MAX_SDU_LEN);
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if ((*pkbuf) == NULL)
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{
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char tmp_buf[MAX_SDU_LEN];
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d_fatal("Can't allocate pkbuf");
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/* Read data from socket to exit from select */
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core_recv(sock, tmp_buf, MAX_SDU_LEN, 0);
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return CORE_ERROR;
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}
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size = core_recv(sock, (*pkbuf)->payload, (*pkbuf)->len, 0);
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if (size <= 0)
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{
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pkbuf_free((*pkbuf));
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if (errno != EAGAIN)
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{
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d_warn("net_read failed(%d:%s)", errno, strerror(errno));
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}
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return CORE_ERROR;
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}
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else
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{
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(*pkbuf)->len = size;
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return CORE_OK;;
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}
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}
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status_t gtp_recvfrom(sock_id sock, pkbuf_t **pkbuf, c_sockaddr_t *from)
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{
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ssize_t size;
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d_assert(sock, return CORE_ERROR,);
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d_assert(from, return CORE_ERROR,);
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*pkbuf = pkbuf_alloc(0, MAX_SDU_LEN);
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if ((*pkbuf) == NULL)
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{
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char tmp_buf[MAX_SDU_LEN];
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d_fatal("Can't allocate pkbuf");
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/* Read data from socket to exit from select */
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core_recv(sock, tmp_buf, MAX_SDU_LEN, 0);
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return CORE_ERROR;
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}
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size = core_recvfrom(sock, (*pkbuf)->payload, (*pkbuf)->len, 0, from);
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if (size <= 0)
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{
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pkbuf_free((*pkbuf));
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if (errno != EAGAIN)
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{
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d_warn("core_recv failed(%d:%s)", errno, strerror(errno));
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}
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return CORE_ERROR;
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}
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else
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{
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(*pkbuf)->len = size;
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return CORE_OK;;
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}
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}
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status_t gtp_send(gtp_node_t *gnode, pkbuf_t *pkbuf)
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{
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char buf[CORE_ADDRSTRLEN];
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ssize_t sent;
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sock_id sock = 0;
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c_sockaddr_t *addr = NULL;
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d_assert(gnode, return CORE_ERROR, "Null param");
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d_assert(pkbuf, return CORE_ERROR, "Null param");
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sock = gnode->sock;
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d_assert(sock, return CORE_ERROR, "Null param");
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/* New interface */
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sock = gnode->sock;
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d_assert(sock, return CORE_ERROR,);
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addr = sock_remote_addr(sock);
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d_assert(addr, return CORE_ERROR,);
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sent = core_send(sock, pkbuf->payload, pkbuf->len, 0);
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if (sent < 0 || sent != pkbuf->len)
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{
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d_error("core_send [%s]:%d failed(%d:%s)",
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CORE_ADDR(addr, buf), CORE_PORT(addr), errno, strerror(errno));
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return CORE_ERROR;
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}
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return CORE_OK;
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}
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pkbuf_t *gtp_handle_echo_req(pkbuf_t *pkb)
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{
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gtp_header_t *gtph = NULL;
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pkbuf_t *pkb_resp;NULL;
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gtp_header_t *gtph_resp;NULL;
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c_uint16_t length;
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int idx;
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d_assert(pkb, return NULL, "pkt is NULL");
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gtph = (gtp_header_t *)pkb->payload;
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/* Check GTP version. Now only support GTPv1(version = 1) */
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if ((gtph->flags >> 5) != 1)
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{
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return NULL;
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}
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if (gtph->type != GTPU_MSGTYPE_ECHO_REQ)
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{
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return NULL;
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}
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d_trace(50, "gtp_handle_without_teid(ECHO_REQ)\n");
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pkb_resp = pkbuf_alloc(0, 100 /* enough for ECHO_RSP; use smaller buffer */);
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d_assert(pkb_resp, return NULL, "Can't allocate pkbuf");
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gtph_resp = (gtp_header_t *)pkb_resp->payload;
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/* reply back immediately */
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gtph_resp->flags = (1 << 5); /* set version */
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gtph_resp->flags |= (1 << 4); /* set PT */
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gtph_resp->type = GTPU_MSGTYPE_ECHO_RSP;
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length = 0; /* length of Recovery IE */
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gtph_resp->length = htons(length); /* to be overwriten */
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gtph_resp->teid = 0;
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idx = 8;
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if (gtph->flags & (GTPU_FLAGS_PN | GTPU_FLAGS_S))
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{
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length += 4;
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if (gtph->flags & GTPU_FLAGS_S)
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{
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/* sequence exists */
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gtph_resp->flags |= GTPU_FLAGS_S;
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*((c_uint8_t *)pkb_resp->payload + idx) = *((c_uint8_t *)pkb->payload + idx);
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*((c_uint8_t *)pkb_resp->payload + idx + 1) = *((c_uint8_t *)pkb->payload + idx + 1);
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}
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else
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{
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*((c_uint8_t *)pkb_resp->payload + idx) = 0;
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*((c_uint8_t *)pkb_resp->payload + idx + 1) = 0;
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}
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idx += 2;
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if (gtph->flags & GTPU_FLAGS_PN)
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{
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/* sequence exists */
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gtph_resp->flags |= GTPU_FLAGS_PN;
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*((c_uint8_t *)pkb_resp->payload + idx) = *((c_uint8_t *)pkb->payload + idx);
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}
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else
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{
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*((c_uint8_t *)pkb_resp->payload + idx) = 0;
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}
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idx++;
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*((c_uint8_t *)pkb_resp->payload + idx) = 0; /* next-extension header */
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idx++;
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}
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/* fill Recovery IE */
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length += 2;
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*((c_uint8_t *)pkb_resp->payload + idx) = 14; idx++; /* type */
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*((c_uint8_t *)pkb_resp->payload + idx) = 0; idx++; /* restart counter */
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gtph_resp->length = htons(length);
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pkb_resp->len = idx; /* buffer length */
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return pkb_resp;
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}
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