blob: 1dea22557e928e38feefdec26afd1b3aef8df704 [file] [log] [blame]
#include "pldm.h"
#include "base.h"
#include <bits/types/struct_iovec.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
const uint8_t MCTP_MSG_TYPE_PLDM = 1;
pldm_requester_rc_t pldm_open(void)
{
ssize_t rc = -1;
int fd = -1;
fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (-1 == fd) {
return fd;
}
const char path[] = "\0mctp-mux";
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, path, sizeof(path) - 1);
rc = connect(fd, (struct sockaddr *)&addr,
sizeof(path) + sizeof(addr.sun_family) - 1);
if (-1 == rc) {
return PLDM_REQUESTER_OPEN_FAIL;
}
rc = write(fd, &MCTP_MSG_TYPE_PLDM, sizeof(MCTP_MSG_TYPE_PLDM));
if (-1 == rc) {
return PLDM_REQUESTER_OPEN_FAIL;
}
return fd;
}
/**
* @brief Read MCTP socket. If there's data available, return success only if
* data is a PLDM message.
*
* @param[in] eid - destination MCTP eid
* @param[in] mctp_fd - MCTP socket fd
* @param[out] pldm_resp_msg - *pldm_resp_msg will point to PLDM msg,
* this function allocates memory, caller to free(*pldm_resp_msg) on
* success.
* @param[out] resp_msg_len - caller owned pointer that will be made point to
* the size of the PLDM msg.
*
* @return pldm_requester_rc_t (errno may be set). failure is returned even
* when data was read, but wasn't a PLDM response message
*/
static pldm_requester_rc_t mctp_recv(mctp_eid_t eid, int mctp_fd,
uint8_t **pldm_resp_msg,
size_t *resp_msg_len)
{
ssize_t min_len = sizeof(eid) + sizeof(MCTP_MSG_TYPE_PLDM) +
sizeof(struct pldm_msg_hdr);
ssize_t length = recv(mctp_fd, NULL, 0, MSG_PEEK | MSG_TRUNC);
if (length <= 0) {
return PLDM_REQUESTER_RECV_FAIL;
} else if (length < min_len) {
/* read and discard */
uint8_t buf[length];
recv(mctp_fd, buf, length, 0);
return PLDM_REQUESTER_INVALID_RECV_LEN;
} else {
struct iovec iov[2];
size_t mctp_prefix_len =
sizeof(eid) + sizeof(MCTP_MSG_TYPE_PLDM);
uint8_t mctp_prefix[mctp_prefix_len];
size_t pldm_len = length - mctp_prefix_len;
iov[0].iov_len = mctp_prefix_len;
iov[0].iov_base = mctp_prefix;
*pldm_resp_msg = malloc(pldm_len);
iov[1].iov_len = pldm_len;
iov[1].iov_base = *pldm_resp_msg;
struct msghdr msg = {0};
msg.msg_iov = iov;
msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
ssize_t bytes = recvmsg(mctp_fd, &msg, 0);
if (length != bytes) {
free(*pldm_resp_msg);
return PLDM_REQUESTER_INVALID_RECV_LEN;
}
if ((mctp_prefix[0] != eid) ||
(mctp_prefix[1] != MCTP_MSG_TYPE_PLDM)) {
free(*pldm_resp_msg);
return PLDM_REQUESTER_NOT_PLDM_MSG;
}
*resp_msg_len = pldm_len;
return PLDM_REQUESTER_SUCCESS;
}
}
pldm_requester_rc_t pldm_recv_any(mctp_eid_t eid, int mctp_fd,
uint8_t **pldm_resp_msg, size_t *resp_msg_len)
{
pldm_requester_rc_t rc =
mctp_recv(eid, mctp_fd, pldm_resp_msg, resp_msg_len);
if (rc != PLDM_REQUESTER_SUCCESS) {
return rc;
}
struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)(*pldm_resp_msg);
if (hdr->request != PLDM_RESPONSE) {
free(*pldm_resp_msg);
return PLDM_REQUESTER_NOT_RESP_MSG;
}
uint8_t pldm_rc = 0;
if (*resp_msg_len < (sizeof(struct pldm_msg_hdr) + sizeof(pldm_rc))) {
free(*pldm_resp_msg);
return PLDM_REQUESTER_RESP_MSG_TOO_SMALL;
}
return PLDM_REQUESTER_SUCCESS;
}
pldm_requester_rc_t pldm_recv(mctp_eid_t eid, int mctp_fd, uint8_t instance_id,
uint8_t **pldm_resp_msg, size_t *resp_msg_len)
{
pldm_requester_rc_t rc =
pldm_recv_any(eid, mctp_fd, pldm_resp_msg, resp_msg_len);
if (rc != PLDM_REQUESTER_SUCCESS) {
return rc;
}
struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)(*pldm_resp_msg);
if (hdr->instance_id != instance_id) {
free(*pldm_resp_msg);
return PLDM_REQUESTER_INSTANCE_ID_MISMATCH;
}
return PLDM_REQUESTER_SUCCESS;
}
pldm_requester_rc_t pldm_send_recv(mctp_eid_t eid, int mctp_fd,
const uint8_t *pldm_req_msg,
size_t req_msg_len, uint8_t **pldm_resp_msg,
size_t *resp_msg_len)
{
struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)pldm_req_msg;
if ((hdr->request != PLDM_REQUEST) &&
(hdr->request != PLDM_ASYNC_REQUEST_NOTIFY)) {
return PLDM_REQUESTER_NOT_REQ_MSG;
}
pldm_requester_rc_t rc =
pldm_send(eid, mctp_fd, pldm_req_msg, req_msg_len);
if (rc != PLDM_REQUESTER_SUCCESS) {
return rc;
}
while (1) {
rc = pldm_recv(eid, mctp_fd, hdr->instance_id, pldm_resp_msg,
resp_msg_len);
if (rc == PLDM_REQUESTER_SUCCESS) {
break;
}
}
return rc;
}
pldm_requester_rc_t pldm_send(mctp_eid_t eid, int mctp_fd,
const uint8_t *pldm_req_msg, size_t req_msg_len)
{
uint8_t hdr[2] = {eid, MCTP_MSG_TYPE_PLDM};
struct iovec iov[2];
iov[0].iov_base = hdr;
iov[0].iov_len = sizeof(hdr);
iov[1].iov_base = (uint8_t *)pldm_req_msg;
iov[1].iov_len = req_msg_len;
struct msghdr msg = {0};
msg.msg_iov = iov;
msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
ssize_t rc = sendmsg(mctp_fd, &msg, 0);
if (rc == -1) {
return PLDM_REQUESTER_SEND_FAIL;
}
return PLDM_REQUESTER_SUCCESS;
}