net_syscall.c

/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "syscall_pub.h"
#include "stdlib.h"
#include "fs_file.h"
#include "fs/fs.h"
#include "los_process_pri.h"
#include "los_signal.h"
#include "los_syscall.h"
#include "los_vm_map.h"
#include "user_copy.h"

#ifdef LOSCFG_NET_LWIP_SACK
#include "lwip/sockets.h"

#define SOCKET_U2K(s) \
    do { \
        s = GetAssociatedSystemFd(s);   \
        if (s == VFS_ERROR) {           \
            set_errno(EBADF);           \
            return -get_errno();        \
        }                               \
    } while (0)

#define SOCKET_K2U(s) \
    do { \
        int fd = AllocAndAssocProcessFd(s, MIN_START_FD); \
        if (fd == -1) { \
            closesocket(s); \
            set_errno(EMFILE); \
            s = -EMFILE; \
        } else { \
            s = fd; \
        } \
    } while (0)

int SysSocket(int domain, int type, int protocol)
{
    int ret;

    ret = socket(domain, type, protocol);
    if (ret == -1) {
        return -get_errno();
    }

    SOCKET_K2U(ret);
    return ret;
}

int SysBind(int s, const struct sockaddr *name, socklen_t namelen)
{
    int ret;

    SOCKET_U2K(s);
    CHECK_ASPACE(name, namelen);

    DUP_FROM_USER(name, namelen);

    if (name == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = bind(s, name, namelen);
    }
    FREE_DUP(name);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

int SysConnect(int s, const struct sockaddr *name, socklen_t namelen)
{
    int ret;

    SOCKET_U2K(s);
    CHECK_ASPACE(name, namelen);

    DUP_FROM_USER(name, namelen);

    if (name == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = connect(s, name, namelen);
    }
    FREE_DUP(name);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

int SysListen(int sockfd, int backlog)
{
    int ret;

    SOCKET_U2K(sockfd);
    ret = listen(sockfd, backlog);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

int SysAccept(int socket, struct sockaddr *address,
              socklen_t *addressLen)
{
    int ret;

    SOCKET_U2K(socket);

    CHECK_ASPACE(addressLen, sizeof(socklen_t));
    CPY_FROM_USER(addressLen);

    CHECK_ASPACE(address, LEN(addressLen));
    DUP_FROM_USER_NOCOPY(address, LEN(addressLen));

    ret = accept(socket, address, addressLen);
    if (ret == -1) {
        FREE_DUP(address);
        return -get_errno();
    }

    CPY_TO_USER(addressLen, close(ret); FREE_DUP(address));
    DUP_TO_USER(address, LEN(addressLen), close(ret); FREE_DUP(address));
    FREE_DUP(address);

    SOCKET_K2U(ret);
    return ret;
}

int SysGetSockName(int s, struct sockaddr *name, socklen_t *namelen)
{
    int ret;

    SOCKET_U2K(s);

    CHECK_ASPACE(namelen, sizeof(socklen_t));
    CPY_FROM_USER(namelen);

    CHECK_ASPACE(name, LEN(namelen));
    DUP_FROM_USER_NOCOPY(name, LEN(namelen));

    if (name == NULL || namelen == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = getsockname(s, name, namelen);
    }
    if (ret == -1) {
        FREE_DUP(name);
        return -get_errno();
    }

    CPY_TO_USER(namelen, FREE_DUP(name));
    DUP_TO_USER(name, LEN(namelen), FREE_DUP(name));
    FREE_DUP(name);
    return ret;
}

int SysGetPeerName(int s, struct sockaddr *name, socklen_t *namelen)
{
    int ret;

    SOCKET_U2K(s);

    CHECK_ASPACE(namelen, sizeof(socklen_t));
    CPY_FROM_USER(namelen);

    CHECK_ASPACE(name, LEN(namelen));
    DUP_FROM_USER_NOCOPY(name, LEN(namelen));

    if (name == NULL || namelen == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = getpeername(s, name, namelen);
    }
    if (ret == -1) {
        FREE_DUP(name);
        return -get_errno();
    }

    CPY_TO_USER(namelen, FREE_DUP(name));
    DUP_TO_USER(name, LEN(namelen), FREE_DUP(name));
    FREE_DUP(name);
    return ret;
}

ssize_t SysSend(int s, const void *dataptr, size_t size, int flags)
{
    int ret;

    SOCKET_U2K(s);
    CHECK_ASPACE(dataptr, size);

    DUP_FROM_USER(dataptr, size);

    if (dataptr == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = send(s, dataptr, size, flags);
    }
    FREE_DUP(dataptr);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

ssize_t SysSendTo(int s, const void *dataptr, size_t size, int flags,
                  const struct sockaddr *to, socklen_t tolen)
{
    int ret;

    SOCKET_U2K(s);
    CHECK_ASPACE(dataptr, size);
    CHECK_ASPACE(to, tolen);

    DUP_FROM_USER(dataptr, size);
    DUP_FROM_USER(to, tolen, FREE_DUP(dataptr));

    if (dataptr == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = sendto(s, dataptr, size, flags, to, tolen);
    }
    FREE_DUP(dataptr);
    FREE_DUP(to);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

ssize_t SysRecv(int socket, void *buffer, size_t length, int flags)
{
    int ret;

    SOCKET_U2K(socket);
    CHECK_ASPACE(buffer, length);

    DUP_FROM_USER_NOCOPY(buffer, length);

    if (buffer == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = recv(socket, buffer, length, flags);
    }
    if (ret == -1) {
        FREE_DUP(buffer);
        return -get_errno();
    }

    DUP_TO_USER(buffer, ret, FREE_DUP(buffer));
    FREE_DUP(buffer);
    return ret;
}

ssize_t SysRecvFrom(int socket, void *buffer, size_t length,
                    int flags, struct sockaddr *address,
                    socklen_t *addressLen)
{
    int ret;

    SOCKET_U2K(socket);
    CHECK_ASPACE(buffer, length);

    CHECK_ASPACE(addressLen, sizeof(socklen_t));
    CPY_FROM_USER(addressLen);

    CHECK_ASPACE(address, LEN(addressLen));
    DUP_FROM_USER_NOCOPY(address, LEN(addressLen));

    DUP_FROM_USER_NOCOPY(buffer, length, FREE_DUP(address));

    if (buffer == NULL || (address != NULL && addressLen == NULL)) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = recvfrom(socket, buffer, length, flags, address, addressLen);
    }
    if (ret == -1) {
        FREE_DUP(address);
        FREE_DUP(buffer);
        return -get_errno();
    }

    CPY_TO_USER(addressLen, FREE_DUP(address); FREE_DUP(buffer));
    DUP_TO_USER(address, LEN(addressLen), FREE_DUP(address); FREE_DUP(buffer));
    DUP_TO_USER(buffer, ret, FREE_DUP(address); FREE_DUP(buffer));
    FREE_DUP(address);
    FREE_DUP(buffer);
    return ret;
}

int SysShutdown(int socket, int how)
{
    int ret;

    SOCKET_U2K(socket);
    ret = shutdown(socket, how);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

int SysSetSockOpt(int socket, int level, int optName,
                  const void *optValue, socklen_t optLen)
{
    int ret;

    SOCKET_U2K(socket);
    CHECK_ASPACE(optValue, optLen);

    DUP_FROM_USER(optValue, optLen);
    ret = setsockopt(socket, level, optName, optValue, optLen);
    FREE_DUP(optValue);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

int SysGetSockOpt(int sockfd, int level, int optName,
                  void *optValue, socklen_t *optLen)
{
    int ret;

    SOCKET_U2K(sockfd);

    CHECK_ASPACE(optLen, sizeof(socklen_t));
    CPY_FROM_USER(optLen);

    CHECK_ASPACE(optValue, LEN(optLen));
    DUP_FROM_USER_NOCOPY(optValue, LEN(optLen));

    if (optLen == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = getsockopt(sockfd, level, optName, optValue, optLen);
    }
    if (ret == -1) {
        FREE_DUP(optValue);
        return -get_errno();
    }

    CPY_TO_USER(optLen, FREE_DUP(optValue));
    DUP_TO_USER(optValue, LEN(optLen), FREE_DUP(optValue));
    FREE_DUP(optValue);
    return ret;
}

ssize_t SysSendMsg(int s, const struct msghdr *message, int flags)
{
    int ret;

    SOCKET_U2K(s);

    CHECK_ASPACE(message, sizeof(struct msghdr));
    CPY_FROM_CONST_USER(struct msghdr, message);

    if (message && message->msg_iovlen > IOV_MAX) {
        set_errno(EMSGSIZE);
        return -get_errno();
    }

    CHECK_FIELD_ASPACE(message, msg_name, message->msg_namelen);
    CHECK_FIELD_ASPACE(message, msg_iov, message->msg_iovlen * sizeof(struct iovec));
    CHECK_FIELD_ASPACE(message, msg_control, message->msg_controllen);

    DUP_FIELD_FROM_USER(message, msg_iov, message->msg_iovlen * sizeof(struct iovec));
    CHECK_ARRAY_FIELD_ASPACE(message, msg_iov, message->msg_iovlen, iov_base, iov_len,
        FREE_DUP_FIELD(message, msg_iov));
    DUP_FIELD_FROM_USER(message, msg_name, message->msg_namelen,
        FREE_DUP_FIELD(message, msg_iov));
    DUP_FIELD_FROM_USER(message, msg_control, message->msg_controllen,
        FREE_DUP_FIELD(message, msg_iov);
        FREE_DUP_FIELD(message, msg_name));
    DUP_ARRAY_FIELD_FROM_USER(message, msg_iov, message->msg_iovlen, iov_base, iov_len,
        FREE_DUP_FIELD(message, msg_control);
        FREE_DUP_FIELD(message, msg_iov);
        FREE_DUP_FIELD(message, msg_name));

    if (message == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = sendmsg(s, message, flags);
    }
    FREE_DUP_ARRAY_FIELD(message, msg_iov, message->msg_iovlen, iov_base);
    FREE_DUP_FIELD(message, msg_control);
    FREE_DUP_FIELD(message, msg_iov);
    FREE_DUP_FIELD(message, msg_name);
    if (ret == -1) {
        return -get_errno();
    }

    return ret;
}

ssize_t SysRecvMsg(int s, struct msghdr *message, int flags)
{
    int ret;

    SOCKET_U2K(s);

    CHECK_ASPACE(message, sizeof(struct msghdr));
    CPY_FROM_NONCONST_USER(message);

    if (message && message->msg_iovlen > IOV_MAX) {
        set_errno(EMSGSIZE);
        return -get_errno();
    }

    CHECK_FIELD_ASPACE(message, msg_name, message->msg_namelen);
    CHECK_FIELD_ASPACE(message, msg_iov, message->msg_iovlen * sizeof(struct iovec));
    CHECK_FIELD_ASPACE(message, msg_control, message->msg_controllen);

    DUP_FIELD_FROM_USER(message, msg_iov, message->msg_iovlen * sizeof(struct iovec));
    CHECK_ARRAY_FIELD_ASPACE(message, msg_iov, message->msg_iovlen, iov_base, iov_len,
        FREE_DUP_FIELD(message, msg_iov));
    DUP_FIELD_FROM_USER_NOCOPY(message, msg_name, message->msg_namelen,
        FREE_DUP_FIELD(message, msg_iov));
    DUP_FIELD_FROM_USER_NOCOPY(message, msg_control, message->msg_controllen,
        FREE_DUP_FIELD(message, msg_iov);
        FREE_DUP_FIELD(message, msg_name));
    DUP_ARRAY_FIELD_FROM_USER_NOCOPY(message, msg_iov, message->msg_iovlen, iov_base, iov_len,
        FREE_DUP_FIELD(message, msg_control);
        FREE_DUP_FIELD(message, msg_iov);
        FREE_DUP_FIELD(message, msg_name));

    if (message == NULL) {
        set_errno(EFAULT);
        ret = -1;
    } else {
        ret = recvmsg(s, message, flags);
    }
    if (ret == -1) {
        goto OUT;
    }

    CPY_TO_USER(message, ret = -1; goto OUT);
    DUP_FIELD_TO_USER(message, msg_control, message->msg_controllen, ret = -1; goto OUT);
    DUP_FIELD_TO_USER(message, msg_iov, message->msg_iovlen * sizeof(struct iovec), ret = -1; goto OUT);
    DUP_FIELD_TO_USER(message, msg_name, message->msg_namelen, ret = -1; goto OUT);
    DUP_ARRAY_FIELD_TO_USER(message, msg_iov, message->msg_iovlen, iov_base, iov_len, ret = -1; goto OUT);
OUT:
    FREE_DUP_ARRAY_FIELD(message, msg_iov, message->msg_iovlen, iov_base);
    FREE_DUP_FIELD(message, msg_control);
    FREE_DUP_FIELD(message, msg_iov);
    FREE_DUP_FIELD(message, msg_name);
    return (ret == -1) ? -get_errno() : ret;
}

#endif