net/util.h

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #ifndef QEMU_NET_UTIL_H
  26 #define QEMU_NET_UTIL_H
  27
  28
  29 /*
  30  * Structure of an internet header, naked of options.
  31  */
  32 struct ip {
  33 #ifdef HOST_WORDS_BIGENDIAN
  34     uint8_t ip_v:4,         /* version */
  35             ip_hl:4;        /* header length */
  36 #else
  37     uint8_t ip_hl:4,        /* header length */
  38             ip_v:4;         /* version */
  39 #endif
  40     uint8_t ip_tos;         /* type of service */
  41     uint16_t ip_len;        /* total length */
  42     uint16_t ip_id;         /* identification */
  43     uint16_t ip_off;        /* fragment offset field */
  44 #define IP_DF 0x4000        /* don't fragment flag */
  45 #define IP_MF 0x2000        /* more fragments flag */
  46 #define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */
  47     uint8_t ip_ttl;         /* time to live */
  48     uint8_t ip_p;           /* protocol */
  49     uint16_t ip_sum;        /* checksum */
  50     struct in_addr ip_src, ip_dst;  /* source and dest address */
  51 } QEMU_PACKED;
  52
  53 static inline bool in6_equal_net(const struct in6_addr *a,
  54                                  const struct in6_addr *b,
  55                                  int prefix_len)
  56 {
  57     if (memcmp(a, b, prefix_len / 8) != 0) {
  58         return 0;
  59     }
  60
  61     if (prefix_len % 8 == 0) {
  62         return 1;
  63     }
  64
  65     return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8))
  66         == b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8));
  67 }
  68
  69 #define TCPS_CLOSED             0       /* closed */
  70 #define TCPS_LISTEN             1       /* listening for connection */
  71 #define TCPS_SYN_SENT           2       /* active, have sent syn */
  72 #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
  73 /* states < TCPS_ESTABLISHED are those where connections not established */
  74 #define TCPS_ESTABLISHED        4       /* established */
  75 #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
  76 /* states > TCPS_CLOSE_WAIT are those where user has closed */
  77 #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
  78 #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
  79 #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
  80 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
  81 #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
  82 #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
  83
  84 int net_parse_macaddr(uint8_t *macaddr, const char *p);
  85
  86 #endif /* QEMU_NET_UTIL_H */