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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2016 6WIND S.A.
* Copyright 2016 Mellanox Technologies, Ltd
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include "mlx5.h"
#include "mlx5_utils.h"
/**
* Initialise the socket to communicate with the secondary process
*
* @param[in] dev
* Pointer to Ethernet device.
*
* @return
* 0 on success, a negative errno value otherwise and rte_errno is set.
*/
int
mlx5_socket_init(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
struct sockaddr_un sun = {
.sun_family = AF_UNIX,
};
int ret;
int flags;
/*
* Close the last socket that was used to communicate
* with the secondary process
*/
if (priv->primary_socket)
mlx5_socket_uninit(dev);
/*
* Initialise the socket to communicate with the secondary
* process.
*/
ret = socket(AF_UNIX, SOCK_STREAM, 0);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u secondary process not supported: %s",
dev->data->port_id, strerror(errno));
goto error;
}
priv->primary_socket = ret;
flags = fcntl(priv->primary_socket, F_GETFL, 0);
if (flags == -1) {
rte_errno = errno;
goto error;
}
ret = fcntl(priv->primary_socket, F_SETFL, flags | O_NONBLOCK);
if (ret < 0) {
rte_errno = errno;
goto error;
}
snprintf(sun.sun_path, sizeof(sun.sun_path), "/var/tmp/%s_%d",
MLX5_DRIVER_NAME, priv->primary_socket);
remove(sun.sun_path);
ret = bind(priv->primary_socket, (const struct sockaddr *)&sun,
sizeof(sun));
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING,
"port %u cannot bind socket, secondary process not"
" supported: %s",
dev->data->port_id, strerror(errno));
goto close;
}
ret = listen(priv->primary_socket, 0);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u secondary process not supported: %s",
dev->data->port_id, strerror(errno));
goto close;
}
return 0;
close:
remove(sun.sun_path);
error:
claim_zero(close(priv->primary_socket));
priv->primary_socket = 0;
return -rte_errno;
}
/**
* Un-Initialise the socket to communicate with the secondary process
*
* @param[in] dev
*/
void
mlx5_socket_uninit(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
MKSTR(path, "/var/tmp/%s_%d", MLX5_DRIVER_NAME, priv->primary_socket);
claim_zero(close(priv->primary_socket));
priv->primary_socket = 0;
claim_zero(remove(path));
}
/**
* Handle socket interrupts.
*
* @param dev
* Pointer to Ethernet device.
*/
void
mlx5_socket_handle(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
int conn_sock;
int ret = 0;
struct cmsghdr *cmsg = NULL;
struct ucred *cred = NULL;
char buf[CMSG_SPACE(sizeof(struct ucred))] = { 0 };
char vbuf[1024] = { 0 };
struct iovec io = {
.iov_base = vbuf,
.iov_len = sizeof(*vbuf),
};
struct msghdr msg = {
.msg_iov = &io,
.msg_iovlen = 1,
.msg_control = buf,
.msg_controllen = sizeof(buf),
};
int *fd;
/* Accept the connection from the client. */
conn_sock = accept(priv->primary_socket, NULL, NULL);
if (conn_sock < 0) {
DRV_LOG(WARNING, "port %u connection failed: %s",
dev->data->port_id, strerror(errno));
return;
}
ret = setsockopt(conn_sock, SOL_SOCKET, SO_PASSCRED, &(int){1},
sizeof(int));
if (ret < 0) {
ret = errno;
DRV_LOG(WARNING, "port %u cannot change socket options: %s",
dev->data->port_id, strerror(rte_errno));
goto error;
}
ret = recvmsg(conn_sock, &msg, MSG_WAITALL);
if (ret < 0) {
ret = errno;
DRV_LOG(WARNING, "port %u received an empty message: %s",
dev->data->port_id, strerror(rte_errno));
goto error;
}
/* Expect to receive credentials only. */
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
DRV_LOG(WARNING, "port %u no message", dev->data->port_id);
goto error;
}
if ((cmsg->cmsg_type == SCM_CREDENTIALS) &&
(cmsg->cmsg_len >= sizeof(*cred))) {
cred = (struct ucred *)CMSG_DATA(cmsg);
assert(cred != NULL);
}
cmsg = CMSG_NXTHDR(&msg, cmsg);
if (cmsg != NULL) {
DRV_LOG(WARNING, "port %u message wrongly formatted",
dev->data->port_id);
goto error;
}
/* Make sure all the ancillary data was received and valid. */
if ((cred == NULL) || (cred->uid != getuid()) ||
(cred->gid != getgid())) {
DRV_LOG(WARNING, "port %u wrong credentials",
dev->data->port_id);
goto error;
}
/* Set-up the ancillary data. */
cmsg = CMSG_FIRSTHDR(&msg);
assert(cmsg != NULL);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(priv->ctx->cmd_fd));
fd = (int *)CMSG_DATA(cmsg);
*fd = priv->ctx->cmd_fd;
ret = sendmsg(conn_sock, &msg, 0);
if (ret < 0)
DRV_LOG(WARNING, "port %u cannot send response",
dev->data->port_id);
error:
close(conn_sock);
}
/**
* Connect to the primary process.
*
* @param[in] dev
* Pointer to Ethernet structure.
*
* @return
* fd on success, negative errno value otherwise and rte_errno is set.
*/
int
mlx5_socket_connect(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
struct sockaddr_un sun = {
.sun_family = AF_UNIX,
};
int socket_fd = -1;
int *fd = NULL;
int ret;
struct ucred *cred;
char buf[CMSG_SPACE(sizeof(*cred))] = { 0 };
char vbuf[1024] = { 0 };
struct iovec io = {
.iov_base = vbuf,
.iov_len = sizeof(*vbuf),
};
struct msghdr msg = {
.msg_control = buf,
.msg_controllen = sizeof(buf),
.msg_iov = &io,
.msg_iovlen = 1,
};
struct cmsghdr *cmsg;
ret = socket(AF_UNIX, SOCK_STREAM, 0);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u cannot connect to primary",
dev->data->port_id);
goto error;
}
socket_fd = ret;
snprintf(sun.sun_path, sizeof(sun.sun_path), "/var/tmp/%s_%d",
MLX5_DRIVER_NAME, priv->primary_socket);
ret = connect(socket_fd, (const struct sockaddr *)&sun, sizeof(sun));
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u cannot connect to primary",
dev->data->port_id);
goto error;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
rte_errno = EINVAL;
DRV_LOG(DEBUG, "port %u cannot get first message",
dev->data->port_id);
goto error;
}
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_CREDENTIALS;
cmsg->cmsg_len = CMSG_LEN(sizeof(*cred));
cred = (struct ucred *)CMSG_DATA(cmsg);
if (cred == NULL) {
rte_errno = EINVAL;
DRV_LOG(DEBUG, "port %u no credentials received",
dev->data->port_id);
goto error;
}
cred->pid = getpid();
cred->uid = getuid();
cred->gid = getgid();
ret = sendmsg(socket_fd, &msg, MSG_DONTWAIT);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING,
"port %u cannot send credentials to primary: %s",
dev->data->port_id, strerror(errno));
goto error;
}
ret = recvmsg(socket_fd, &msg, MSG_WAITALL);
if (ret <= 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u no message from primary: %s",
dev->data->port_id, strerror(errno));
goto error;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
rte_errno = EINVAL;
DRV_LOG(WARNING, "port %u no file descriptor received",
dev->data->port_id);
goto error;
}
fd = (int *)CMSG_DATA(cmsg);
if (*fd < 0) {
DRV_LOG(WARNING, "port %u no file descriptor received: %s",
dev->data->port_id, strerror(errno));
rte_errno = *fd;
goto error;
}
ret = *fd;
close(socket_fd);
return ret;
error:
if (socket_fd != -1)
close(socket_fd);
return -rte_errno;
}
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