mirror of
https://github.com/open5gs/open5gs.git
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350bc271fa
This commit modifies the message length check in ogs_pfcp_recvfrom. Previously, the condition only verified that the received size was less than the expected length, which could allow messages that are too long to be processed. The condition now requires an exact match between the received size and the expected total PFCP message length, ensuring proper message validation.
606 lines
17 KiB
C
606 lines
17 KiB
C
/*
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* Copyright (C) 2019-2025 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "ogs-pfcp.h"
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ogs_sock_t *ogs_pfcp_server(ogs_socknode_t *node)
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{
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char buf[OGS_ADDRSTRLEN];
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ogs_sock_t *pfcp;
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ogs_assert(node);
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pfcp = ogs_udp_server(node->addr, node->option);
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if (pfcp) {
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ogs_info("pfcp_server() [%s]:%d",
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OGS_ADDR(node->addr, buf), OGS_PORT(node->addr));
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node->sock = pfcp;
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}
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return pfcp;
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}
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/* Minimum PFCP header length (e.g., 12 bytes) */
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#define MIN_PFCP_HEADER_LENGTH 12
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/*
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* ogs_pfcp_recvfrom
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*
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* Receives a PFCP message from the socket 'fd'. It allocates a pkbuf,
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* receives the message, trims the pkbuf, and verifies the header.
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* If any error occurs (e.g., too short message, unsupported version, or
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* incomplete message), the function frees the pkbuf and returns NULL.
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*
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* The sender's address is stored in 'from'.
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*
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* Returns a pointer to ogs_pkbuf_t on success, or NULL on failure.
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*/
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ogs_pkbuf_t *ogs_pfcp_recvfrom(ogs_socket_t fd, ogs_sockaddr_t *from)
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{
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ogs_pkbuf_t *pkbuf;
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ssize_t size;
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ogs_pfcp_header_t *h;
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uint16_t pfcp_body_length;
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size_t expected_total_length;
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ogs_assert(fd != INVALID_SOCKET);
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ogs_assert(from);
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/* Allocate buffer for maximum SDU length */
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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if (pkbuf == NULL) {
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ogs_error("ogs_pkbuf_alloc() failed");
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return NULL;
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}
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ogs_pkbuf_put(pkbuf, OGS_MAX_SDU_LEN);
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size = ogs_recvfrom(fd, pkbuf->data, pkbuf->len, 0, from);
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if (size <= 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
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"ogs_recvfrom() failed");
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ogs_pkbuf_free(pkbuf);
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return NULL;
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}
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ogs_pkbuf_trim(pkbuf, size);
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/* Check that the data is at least as long as the header */
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if (size < MIN_PFCP_HEADER_LENGTH) {
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ogs_error("Received PFCP message too short: %ld bytes (min %d)",
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size, MIN_PFCP_HEADER_LENGTH);
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ogs_pkbuf_free(pkbuf);
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return NULL;
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}
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h = (ogs_pfcp_header_t *)pkbuf->data;
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/* Verify PFCP version */
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if (h->version != OGS_PFCP_VERSION) {
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ogs_pfcp_header_t rsp;
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memset(&rsp, 0, sizeof(rsp));
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ogs_error("Not supported version[%d]", h->version);
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rsp.flags = (OGS_PFCP_VERSION << 5);
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rsp.type = OGS_PFCP_VERSION_NOT_SUPPORTED_RESPONSE_TYPE;
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rsp.length = htobe16(4);
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rsp.sqn_only = h->sqn_only;
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if (ogs_sendto(fd, &rsp, 8, 0, from) < 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
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"ogs_sendto() failed");
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}
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ogs_pkbuf_free(pkbuf);
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return NULL;
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}
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/* Check total PFCP message length.
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Assume the header's length field indicates the body length,
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excluding the first 4 bytes. */
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pfcp_body_length = be16toh(h->length);
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expected_total_length = pfcp_body_length + 4;
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if ((size_t)size != expected_total_length) {
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ogs_error("Invalid PFCP Header Length: expected %zu bytes, "
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"received %ld bytes", expected_total_length, size);
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ogs_pkbuf_free(pkbuf);
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return NULL;
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}
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return pkbuf;
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}
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int ogs_pfcp_sendto(ogs_pfcp_node_t *node, ogs_pkbuf_t *pkbuf)
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{
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ssize_t sent;
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ogs_sock_t *sock = NULL;
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ogs_sockaddr_t *addr = NULL;
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ogs_assert(node);
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ogs_assert(pkbuf);
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ogs_assert(node->addr_list);
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/* Initialize round-robin iterator if needed */
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if (node->current_addr == NULL) {
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node->current_addr = node->addr_list;
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}
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addr = node->current_addr;
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ogs_assert(addr);
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if (addr->ogs_sa_family == AF_INET) {
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sock = ogs_pfcp_self()->pfcp_sock;
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if (!sock) {
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ogs_error("IPv4 socket (pfcp_sock) is not available. "
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"Ensure that 'pfcp.server.address: 127.0.0.1' "
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"is set in the YAML configuration file.");
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return OGS_ERROR;
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}
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} else if (addr->ogs_sa_family == AF_INET6) {
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sock = ogs_pfcp_self()->pfcp_sock6;
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if (!sock) {
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ogs_error("IPv6 socket (pfcp_sock) is not available. "
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"Ensure that 'pfcp.server.address: [::1]' "
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"is set in the YAML configuration file.");
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return OGS_ERROR;
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}
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} else
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ogs_assert_if_reached();
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sent = ogs_sendto(sock->fd, pkbuf->data, pkbuf->len, 0, addr);
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if (sent < 0 || sent != pkbuf->len) {
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if (ogs_socket_errno != OGS_EAGAIN) {
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char buf[OGS_ADDRSTRLEN];
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int err = ogs_socket_errno;
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ogs_log_message(OGS_LOG_ERROR, err,
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"ogs_sendto(%u, %p, %u, 0, %s:%u) failed",
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sock->fd, pkbuf->data, pkbuf->len,
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OGS_ADDR(addr, buf), OGS_PORT(addr));
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}
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return OGS_ERROR;
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}
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/* Move to next address in round-robin sequence */
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if (node->current_addr->next)
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node->current_addr = node->current_addr->next;
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else
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/* If end of list reached, wrap around to the start */
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node->current_addr = node->addr_list;
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return OGS_OK;
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}
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int ogs_pfcp_send_heartbeat_request(ogs_pfcp_node_t *node,
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void (*cb)(ogs_pfcp_xact_t *xact, void *data))
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{
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int rv;
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ogs_pkbuf_t *pkbuf = NULL;
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ogs_pfcp_header_t h;
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ogs_pfcp_xact_t *xact = NULL;
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ogs_assert(node);
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memset(&h, 0, sizeof(ogs_pfcp_header_t));
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h.type = OGS_PFCP_HEARTBEAT_REQUEST_TYPE;
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h.seid = 0;
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xact = ogs_pfcp_xact_local_create(node, cb, node);
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if (!xact) {
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ogs_error("ogs_pfcp_xact_local_create() failed");
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return OGS_ERROR;
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}
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pkbuf = ogs_pfcp_build_heartbeat_request(h.type);
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if (!pkbuf) {
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ogs_error("ogs_pfcp_build_heartbeat_request() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_update_tx(xact, &h, pkbuf);
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if (rv != OGS_OK) {
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ogs_error("ogs_pfcp_xact_update_tx() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_commit(xact);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int ogs_pfcp_send_heartbeat_response(ogs_pfcp_xact_t *xact)
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{
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int rv;
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ogs_pkbuf_t *pkbuf = NULL;
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ogs_pfcp_header_t h;
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ogs_assert(xact);
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memset(&h, 0, sizeof(ogs_pfcp_header_t));
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h.type = OGS_PFCP_HEARTBEAT_RESPONSE_TYPE;
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h.seid = 0;
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pkbuf = ogs_pfcp_build_heartbeat_response(h.type);
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if (!pkbuf) {
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ogs_error("ogs_pfcp_build_heartbeat_response() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_update_tx(xact, &h, pkbuf);
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if (rv != OGS_OK) {
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ogs_error("ogs_pfcp_xact_update_tx() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_commit(xact);
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ogs_expect(rv == OGS_OK);
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/*
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* Force delete the PFCP transaction to check the PFCP recovery timestamp.
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*
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* Otherwise, duplicated request (lib/pfcp/xact.c:384) prevents the message
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* from being passed to the state machine, so the PFCP recovery timestamp
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* cannot be delivered in the handler routine.
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*/
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ogs_pfcp_xact_delete(xact);
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return rv;
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}
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int ogs_pfcp_cp_send_association_setup_request(ogs_pfcp_node_t *node,
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void (*cb)(ogs_pfcp_xact_t *xact, void *data))
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{
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int rv;
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ogs_pkbuf_t *pkbuf = NULL;
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ogs_pfcp_header_t h;
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ogs_pfcp_xact_t *xact = NULL;
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ogs_assert(node);
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memset(&h, 0, sizeof(ogs_pfcp_header_t));
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h.type = OGS_PFCP_ASSOCIATION_SETUP_REQUEST_TYPE;
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h.seid = 0;
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xact = ogs_pfcp_xact_local_create(node, cb, node);
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if (!xact) {
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ogs_error("ogs_pfcp_xact_local_create() failed");
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return OGS_ERROR;
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}
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pkbuf = ogs_pfcp_cp_build_association_setup_request(h.type);
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if (!pkbuf) {
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ogs_error("ogs_pfcp_cp_build_association_setup_request() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_update_tx(xact, &h, pkbuf);
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if (rv != OGS_OK) {
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ogs_error("ogs_pfcp_xact_update_tx() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_commit(xact);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int ogs_pfcp_cp_send_association_setup_response(ogs_pfcp_xact_t *xact,
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uint8_t cause)
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{
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int rv;
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ogs_pkbuf_t *pkbuf = NULL;
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ogs_pfcp_header_t h;
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ogs_assert(xact);
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memset(&h, 0, sizeof(ogs_pfcp_header_t));
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h.type = OGS_PFCP_ASSOCIATION_SETUP_RESPONSE_TYPE;
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h.seid = 0;
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pkbuf = ogs_pfcp_cp_build_association_setup_response(h.type, cause);
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if (!pkbuf) {
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ogs_error("ogs_pfcp_cp_build_association_setup_response() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_update_tx(xact, &h, pkbuf);
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if (rv != OGS_OK) {
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ogs_error("ogs_pfcp_xact_update_tx() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_commit(xact);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int ogs_pfcp_up_send_association_setup_request(ogs_pfcp_node_t *node,
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void (*cb)(ogs_pfcp_xact_t *xact, void *data))
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{
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int rv;
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ogs_pkbuf_t *pkbuf = NULL;
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ogs_pfcp_header_t h;
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ogs_pfcp_xact_t *xact = NULL;
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ogs_assert(node);
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memset(&h, 0, sizeof(ogs_pfcp_header_t));
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h.type = OGS_PFCP_ASSOCIATION_SETUP_REQUEST_TYPE;
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h.seid = 0;
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xact = ogs_pfcp_xact_local_create(node, cb, node);
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if (!xact) {
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ogs_error("ogs_pfcp_xact_local_create() failed");
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return OGS_ERROR;
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}
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pkbuf = ogs_pfcp_up_build_association_setup_request(h.type);
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if (!pkbuf) {
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ogs_error("ogs_pfcp_build_heartbeat_request() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_update_tx(xact, &h, pkbuf);
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if (rv != OGS_OK) {
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ogs_error("ogs_pfcp_xact_update_tx() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_commit(xact);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int ogs_pfcp_up_send_association_setup_response(ogs_pfcp_xact_t *xact,
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uint8_t cause)
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{
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int rv;
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ogs_pkbuf_t *pkbuf = NULL;
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ogs_pfcp_header_t h;
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ogs_assert(xact);
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memset(&h, 0, sizeof(ogs_pfcp_header_t));
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h.type = OGS_PFCP_ASSOCIATION_SETUP_RESPONSE_TYPE;
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h.seid = 0;
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pkbuf = ogs_pfcp_up_build_association_setup_response(h.type, cause);
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if (!pkbuf) {
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ogs_error("ogs_pfcp_up_build_association_setup_response() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_update_tx(xact, &h, pkbuf);
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if (rv != OGS_OK) {
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ogs_error("ogs_pfcp_xact_update_tx() failed");
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return OGS_ERROR;
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}
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rv = ogs_pfcp_xact_commit(xact);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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void ogs_pfcp_send_g_pdu(
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ogs_pfcp_pdr_t *pdr,
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ogs_gtp2_header_desc_t *sendhdr, ogs_pkbuf_t *sendbuf)
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{
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ogs_gtp_node_t *gnode = NULL;
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ogs_pfcp_far_t *far = NULL;
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ogs_gtp2_header_desc_t header_desc;
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ogs_assert(pdr);
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ogs_assert(sendhdr);
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ogs_assert(sendbuf);
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far = pdr->far;
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if (!far) {
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ogs_error("No FAR");
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ogs_pkbuf_free(sendbuf);
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return;
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}
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if (far->dst_if == OGS_PFCP_INTERFACE_UNKNOWN) {
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ogs_error("No Destination Interface");
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ogs_pkbuf_free(sendbuf);
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return;
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}
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gnode = far->gnode;
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ogs_assert(gnode);
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ogs_assert(gnode->sock);
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memset(&header_desc, 0, sizeof(header_desc));
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header_desc.type = sendhdr->type;
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header_desc.teid = far->outer_header_creation.teid;
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if (pdr->qer && pdr->qer->qfi) {
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header_desc.pdu_type =
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OGS_GTP2_EXTENSION_HEADER_PDU_TYPE_DL_PDU_SESSION_INFORMATION;
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header_desc.qos_flow_identifier = pdr->qer->qfi;
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}
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if (sendhdr->udp.presence == true) {
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header_desc.udp.presence = sendhdr->udp.presence;
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header_desc.udp.port = sendhdr->udp.port;
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}
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if (sendhdr->pdcp_number_presence == true) {
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header_desc.pdcp_number_presence = sendhdr->pdcp_number_presence;
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header_desc.pdcp_number = sendhdr->pdcp_number;
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}
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ogs_gtp2_send_user_plane(gnode, &header_desc, sendbuf);
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}
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int ogs_pfcp_send_end_marker(ogs_pfcp_pdr_t *pdr)
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{
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ogs_gtp_node_t *gnode = NULL;
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ogs_pfcp_far_t *far = NULL;
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ogs_pkbuf_t *sendbuf = NULL;
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ogs_gtp2_header_desc_t header_desc;
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ogs_assert(pdr);
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far = pdr->far;
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ogs_assert(far);
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gnode = far->gnode;
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if (!gnode) {
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ogs_error("No GTP Node Setup");
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return OGS_DONE;
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}
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if (!gnode->sock) {
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ogs_error("No GTP Socket Setup");
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return OGS_DONE;
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}
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sendbuf = ogs_pkbuf_alloc(NULL, OGS_GTPV1U_5GC_HEADER_LEN);
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if (!sendbuf) {
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ogs_error("ogs_pkbuf_alloc() failed");
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return OGS_ERROR;
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}
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ogs_pkbuf_reserve(sendbuf, OGS_GTPV1U_5GC_HEADER_LEN);
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memset(&header_desc, 0, sizeof(header_desc));
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header_desc.type = OGS_GTPU_MSGTYPE_END_MARKER;
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header_desc.teid = far->outer_header_creation.teid;
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if (pdr->qer && pdr->qer->qfi) {
|
|
header_desc.pdu_type =
|
|
OGS_GTP2_EXTENSION_HEADER_PDU_TYPE_DL_PDU_SESSION_INFORMATION;
|
|
header_desc.qos_flow_identifier = pdr->qer->qfi;
|
|
}
|
|
|
|
ogs_gtp2_send_user_plane(gnode, &header_desc, sendbuf);
|
|
|
|
return OGS_OK;
|
|
}
|
|
|
|
void ogs_pfcp_send_buffered_packet(ogs_pfcp_pdr_t *pdr)
|
|
{
|
|
ogs_pfcp_far_t *far = NULL;
|
|
int i;
|
|
|
|
ogs_assert(pdr);
|
|
far = pdr->far;
|
|
|
|
if (far && far->gnode) {
|
|
if (far->apply_action & OGS_PFCP_APPLY_ACTION_FORW) {
|
|
for (i = 0; i < far->num_of_buffered_packet; i++) {
|
|
ogs_gtp2_header_desc_t sendhdr;
|
|
|
|
memset(&sendhdr, 0, sizeof(sendhdr));
|
|
sendhdr.type = OGS_GTPU_MSGTYPE_GPDU;
|
|
|
|
ogs_pfcp_send_g_pdu(
|
|
pdr, &sendhdr, far->buffered_packet[i]);
|
|
}
|
|
far->num_of_buffered_packet = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ogs_pfcp_send_error_message(
|
|
ogs_pfcp_xact_t *xact, uint64_t seid, uint8_t type,
|
|
uint8_t cause_value, uint16_t offending_ie_value)
|
|
{
|
|
int rv;
|
|
ogs_pfcp_message_t errmsg;
|
|
ogs_pfcp_tlv_cause_t *cause = NULL;
|
|
ogs_pfcp_tlv_offending_ie_t *offending_ie = NULL;
|
|
ogs_pkbuf_t *pkbuf = NULL;
|
|
|
|
ogs_assert(xact);
|
|
|
|
memset(&errmsg, 0, sizeof(ogs_pfcp_message_t));
|
|
errmsg.h.seid = seid;
|
|
errmsg.h.type = type;
|
|
|
|
switch (type) {
|
|
case OGS_PFCP_PFD_MANAGEMENT_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_pfd_management_response.cause;
|
|
offending_ie = &errmsg.pfcp_pfd_management_response.offending_ie;
|
|
break;
|
|
case OGS_PFCP_ASSOCIATION_SETUP_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_association_setup_response.cause;
|
|
break;
|
|
case OGS_PFCP_ASSOCIATION_UPDATE_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_association_update_response.cause;
|
|
break;
|
|
case OGS_PFCP_ASSOCIATION_RELEASE_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_association_release_response.cause;
|
|
break;
|
|
case OGS_PFCP_NODE_REPORT_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_node_report_response.cause;
|
|
offending_ie = &errmsg.pfcp_node_report_response.offending_ie;
|
|
break;
|
|
case OGS_PFCP_SESSION_SET_DELETION_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_session_set_deletion_response.cause;
|
|
offending_ie = &errmsg.pfcp_session_set_deletion_response.offending_ie;
|
|
break;
|
|
case OGS_PFCP_SESSION_ESTABLISHMENT_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_session_establishment_response.cause;
|
|
offending_ie = &errmsg.pfcp_session_establishment_response.offending_ie;
|
|
break;
|
|
case OGS_PFCP_SESSION_MODIFICATION_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_session_modification_response.cause;
|
|
offending_ie = &errmsg.pfcp_session_modification_response.offending_ie;
|
|
break;
|
|
case OGS_PFCP_SESSION_DELETION_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_session_deletion_response.cause;
|
|
offending_ie = &errmsg.pfcp_session_deletion_response.offending_ie;
|
|
break;
|
|
case OGS_PFCP_SESSION_REPORT_RESPONSE_TYPE:
|
|
cause = &errmsg.pfcp_session_report_response.cause;
|
|
offending_ie = &errmsg.pfcp_session_report_response.offending_ie;
|
|
break;
|
|
default:
|
|
ogs_assert_if_reached();
|
|
return;
|
|
}
|
|
|
|
ogs_assert(cause);
|
|
|
|
cause->presence = 1;
|
|
cause->u8 = cause_value;
|
|
|
|
if (offending_ie && offending_ie_value) {
|
|
offending_ie->presence = 1;
|
|
offending_ie->u16 = offending_ie_value;
|
|
}
|
|
|
|
pkbuf = ogs_pfcp_build_msg(&errmsg);
|
|
if (!pkbuf) {
|
|
ogs_error("ogs_pfcp_build_msg() failed");
|
|
return;
|
|
}
|
|
|
|
rv = ogs_pfcp_xact_update_tx(xact, &errmsg.h, pkbuf);
|
|
if (rv != OGS_OK) {
|
|
ogs_error("ogs_pfcp_xact_update_tx() failed");
|
|
return;
|
|
}
|
|
|
|
rv = ogs_pfcp_xact_commit(xact);
|
|
ogs_expect(rv == OGS_OK);
|
|
}
|