slirp/util.h

   1 /*
   2  * Copyright (c) 2003-2008 Fabrice Bellard
   3  * Copyright (c) 2010-2019 Red Hat, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21  * THE SOFTWARE.
  22  */
  23 #ifndef UTIL_H_
  24 #define UTIL_H_
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <assert.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <unistd.h>
  34 #include <inttypes.h>
  35
  36 #ifdef _WIN32
  37 #include <winsock2.h>
  38 #include <windows.h>
  39 #else
  40 #include <sys/socket.h>
  41 #include <netinet/tcp.h>
  42 #include <netinet/in.h>
  43 #endif
  44
  45 #if defined(_WIN32)
  46 # define SLIRP_PACKED __attribute__((gcc_struct, packed))
  47 #else
  48 # define SLIRP_PACKED __attribute__((packed))
  49 #endif
  50
  51 #ifndef DIV_ROUND_UP
  52 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
  53 #endif
  54
  55 #ifndef container_of
  56 #define container_of(ptr, type, member) __extension__ ({    \
  57     void *__mptr = (void *)(ptr);               \
  58     ((type *)(__mptr - offsetof(type, member))); })
  59 #endif
  60
  61 #if defined(_WIN32) /* CONFIG_IOVEC */
  62 # if !defined(IOV_MAX) /* XXX: to avoid duplicate with QEMU osdep.h */
  63 struct iovec {
  64     void *iov_base;
  65     size_t iov_len;
  66 };
  67 # endif
  68 #else
  69 #include <sys/uio.h>
  70 #endif
  71
  72 #define SCALE_MS 1000000
  73
  74 #define ETH_ALEN    6
  75 #define ETH_HLEN    14
  76 #define ETH_P_IP                  (0x0800)      /* Internet Protocol packet  */
  77 #define ETH_P_ARP                 (0x0806)      /* Address Resolution packet */
  78 #define ETH_P_IPV6                (0x86dd)
  79 #define ETH_P_VLAN                (0x8100)
  80 #define ETH_P_DVLAN               (0x88a8)
  81 #define ETH_P_NCSI                (0x88f8)
  82 #define ETH_P_UNKNOWN             (0xffff)
  83
  84 #ifdef _WIN32
  85 int slirp_closesocket(int fd);
  86 int slirp_ioctlsocket(int fd, int req, void *val);
  87 int inet_aton(const char *cp, struct in_addr *ia);
  88 #define slirp_getsockopt(sockfd, level, optname, optval, optlen) \
  89     getsockopt(sockfd, level, optname, (void *)optval, optlen)
  90 #define slirp_setsockopt(sockfd, level, optname, optval, optlen)        \
  91     setsockopt(sockfd, level, optname, (const void *)optval, optlen)
  92 #define slirp_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
  93 #else
  94 #define slirp_setsockopt setsockopt
  95 #define slirp_getsockopt getsockopt
  96 #define slirp_recv recv
  97 #define slirp_closesocket close
  98 #define slirp_ioctlsocket ioctl
  99 #endif
 100
 101 int slirp_socket(int domain, int type, int protocol);
 102 void slirp_set_nonblock(int fd);
 103
 104 static inline int slirp_socket_set_nodelay(int fd)
 105 {
 106     int v = 1;
 107     return slirp_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v));
 108 }
 109
 110 static inline int slirp_socket_set_fast_reuse(int fd)
 111 {
 112 #ifndef _WIN32
 113     int v = 1;
 114     return slirp_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v));
 115 #else
 116     /* Enabling the reuse of an endpoint that was used by a socket still in
 117      * TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
 118      * fast reuse is the default and SO_REUSEADDR does strange things. So we
 119      * don't have to do anything here. More info can be found at:
 120      * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
 121     return 0;
 122 #endif
 123 }
 124
 125 void slirp_pstrcpy(char *buf, int buf_size, const char *str);
 126
 127 #endif