slirp/socket.h

   1 /*
   2  * Copyright (c) 1995 Danny Gasparovski.
   3  *
   4  * Please read the file COPYRIGHT for the
   5  * terms and conditions of the copyright.
   6  */
   7
   8 #ifndef SLIRP_SOCKET_H
   9 #define SLIRP_SOCKET_H
  10
  11 #include "misc.h"
  12
  13 #define SO_EXPIRE 240000
  14 #define SO_EXPIREFAST 10000
  15
  16 /*
  17  * Our socket structure
  18  */
  19
  20 union slirp_sockaddr {
  21     struct sockaddr_storage ss;
  22     struct sockaddr_in sin;
  23     struct sockaddr_in6 sin6;
  24 };
  25
  26 struct socket {
  27   struct socket *so_next,*so_prev;      /* For a linked list of sockets */
  28
  29   int s;                           /* The actual socket */
  30   struct gfwd_list *guestfwd;
  31
  32   int pollfds_idx;                 /* GPollFD GArray index */
  33
  34   Slirp *slirp;                    /* managing slirp instance */
  35
  36                         /* XXX union these with not-yet-used sbuf params */
  37   struct mbuf *so_m;               /* Pointer to the original SYN packet,
  38                                     * for non-blocking connect()'s, and
  39                                     * PING reply's */
  40   struct tcpiphdr *so_ti;          /* Pointer to the original ti within
  41                                     * so_mconn, for non-blocking connections */
  42   uint32_t      so_urgc;
  43   union slirp_sockaddr fhost;      /* Foreign host */
  44 #define so_faddr fhost.sin.sin_addr
  45 #define so_fport fhost.sin.sin_port
  46 #define so_faddr6 fhost.sin6.sin6_addr
  47 #define so_fport6 fhost.sin6.sin6_port
  48 #define so_ffamily fhost.ss.ss_family
  49
  50   union slirp_sockaddr lhost;      /* Local host */
  51 #define so_laddr lhost.sin.sin_addr
  52 #define so_lport lhost.sin.sin_port
  53 #define so_laddr6 lhost.sin6.sin6_addr
  54 #define so_lport6 lhost.sin6.sin6_port
  55 #define so_lfamily lhost.ss.ss_family
  56
  57   uint8_t       so_iptos;       /* Type of service */
  58   uint8_t       so_emu;         /* Is the socket emulated? */
  59
  60   uint8_t       so_type;        /* Type of socket, UDP or TCP */
  61   int32_t       so_state;       /* internal state flags SS_*, below */
  62
  63   struct        tcpcb *so_tcpcb;        /* pointer to TCP protocol control block */
  64   unsigned      so_expire;              /* When the socket will expire */
  65
  66   int   so_queued;              /* Number of packets queued from this socket */
  67   int   so_nqueued;             /* Number of packets queued in a row
  68                                  * Used to determine when to "downgrade" a session
  69                                          * from fastq to batchq */
  70
  71   struct sbuf so_rcv;           /* Receive buffer */
  72   struct sbuf so_snd;           /* Send buffer */
  73 };
  74
  75
  76 /*
  77  * Socket state bits. (peer means the host on the Internet,
  78  * local host means the host on the other end of the modem)
  79  */
  80 #define SS_NOFDREF              0x001   /* No fd reference */
  81
  82 #define SS_ISFCONNECTING        0x002   /* Socket is connecting to peer (non-blocking connect()'s) */
  83 #define SS_ISFCONNECTED         0x004   /* Socket is connected to peer */
  84 #define SS_FCANTRCVMORE         0x008   /* Socket can't receive more from peer (for half-closes) */
  85 #define SS_FCANTSENDMORE        0x010   /* Socket can't send more to peer (for half-closes) */
  86 #define SS_FWDRAIN              0x040   /* We received a FIN, drain data and set SS_FCANTSENDMORE */
  87
  88 #define SS_CTL                  0x080
  89 #define SS_FACCEPTCONN          0x100   /* Socket is accepting connections from a host on the internet */
  90 #define SS_FACCEPTONCE          0x200   /* If set, the SS_FACCEPTCONN socket will die after one accept */
  91
  92 #define SS_PERSISTENT_MASK      0xf000  /* Unremovable state bits */
  93 #define SS_HOSTFWD              0x1000  /* Socket describes host->guest forwarding */
  94 #define SS_INCOMING             0x2000  /* Connection was initiated by a host on the internet */
  95
  96 static inline int sockaddr_equal(struct sockaddr_storage *a,
  97         struct sockaddr_storage *b)
  98 {
  99     if (a->ss_family != b->ss_family) {
 100         return 0;
 101     }
 102
 103     switch (a->ss_family) {
 104     case AF_INET:
 105     {
 106         struct sockaddr_in *a4 = (struct sockaddr_in *) a;
 107         struct sockaddr_in *b4 = (struct sockaddr_in *) b;
 108         return a4->sin_addr.s_addr == b4->sin_addr.s_addr
 109                && a4->sin_port == b4->sin_port;
 110     }
 111     case AF_INET6:
 112     {
 113         struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) a;
 114         struct sockaddr_in6 *b6 = (struct sockaddr_in6 *) b;
 115         return (in6_equal(&a6->sin6_addr, &b6->sin6_addr)
 116                 && a6->sin6_port == b6->sin6_port);
 117     }
 118     default:
 119         g_assert_not_reached();
 120     }
 121
 122     return 0;
 123 }
 124
 125 static inline socklen_t sockaddr_size(struct sockaddr_storage *a)
 126 {
 127     switch (a->ss_family) {
 128     case AF_INET:
 129         return sizeof(struct sockaddr_in);
 130     case AF_INET6:
 131         return sizeof(struct sockaddr_in6);
 132     default:
 133         g_assert_not_reached();
 134     }
 135 }
 136
 137 struct socket *solookup(struct socket **, struct socket *,
 138         struct sockaddr_storage *, struct sockaddr_storage *);
 139 struct socket *socreate(Slirp *);
 140 void sofree(struct socket *);
 141 int soread(struct socket *);
 142 int sorecvoob(struct socket *);
 143 int sosendoob(struct socket *);
 144 int sowrite(struct socket *);
 145 void sorecvfrom(struct socket *);
 146 int sosendto(struct socket *, struct mbuf *);
 147 struct socket * tcp_listen(Slirp *, uint32_t, unsigned, uint32_t, unsigned,
 148                                int);
 149 void soisfconnecting(register struct socket *);
 150 void soisfconnected(register struct socket *);
 151 void sofwdrain(struct socket *);
 152 struct iovec; /* For win32 */
 153 size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np);
 154 int soreadbuf(struct socket *so, const char *buf, int size);
 155
 156 void sotranslate_out(struct socket *, struct sockaddr_storage *);
 157 void sotranslate_in(struct socket *, struct sockaddr_storage *);
 158 void sotranslate_accept(struct socket *);
 159 void sodrop(struct socket *, int num);
 160
 161
 162 #endif /* SLIRP_SOCKET_H */