1 /* uipc_socket.c 4.22 82/01/07 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/dir.h" 6 #include "../h/user.h" 7 #include "../h/proc.h" 8 #include "../h/file.h" 9 #include "../h/inode.h" 10 #include "../h/buf.h" 11 #include "../h/mbuf.h" 12 #include "../h/protosw.h" 13 #include "../h/socket.h" 14 #include "../h/socketvar.h" 15 #include "../h/stat.h" 16 #include "../h/ioctl.h" 17 #include "../net/in.h" 18 #include "../net/in_systm.h" 19 20 /* 21 * Socket support routines. 22 * 23 * DEAL WITH INTERRUPT NOTIFICATION. 24 */ 25 26 /* 27 * Create a socket. 28 */ 29 socreate(aso, type, asp, asa, options) 30 struct socket **aso; 31 int type; 32 struct sockproto *asp; 33 struct sockaddr *asa; 34 int options; 35 { 36 register struct protosw *prp; 37 register struct socket *so; 38 struct mbuf *m; 39 int pf, proto, error; 40 COUNT(SOCREATE); 41 42 /* 43 * Use process standard protocol/protocol family if none 44 * specified by address argument. 45 */ 46 if (asp == 0) { 47 pf = PF_INET; /* should be u.u_protof */ 48 proto = 0; 49 } else { 50 pf = asp->sp_family; 51 proto = asp->sp_protocol; 52 } 53 54 /* 55 * If protocol specified, look for it, otherwise 56 * for a protocol of the correct type in the right family. 57 */ 58 if (proto) 59 prp = pffindproto(pf, proto); 60 else 61 prp = pffindtype(pf, type); 62 if (prp == 0) 63 return (EPROTONOSUPPORT); 64 65 /* 66 * Get a socket structure. 67 */ 68 m = m_getclr(M_WAIT); 69 if (m == 0) 70 return (ENOBUFS); 71 so = mtod(m, struct socket *); 72 so->so_options = options; 73 74 /* 75 * Attach protocol to socket, initializing 76 * and reserving resources. 77 */ 78 so->so_proto = prp; 79 error = (*prp->pr_usrreq)(so, PRU_ATTACH, 0, asa); 80 if (error) { 81 (void) m_free(dtom(so)); 82 return (error); 83 } 84 *aso = so; 85 return (0); 86 } 87 88 sofree(so) 89 struct socket *so; 90 { 91 92 COUNT(SOFREE); 93 if (so->so_pcb || (so->so_state & SS_USERGONE) == 0) 94 return; 95 sbrelease(&so->so_snd); 96 sbrelease(&so->so_rcv); 97 (void) m_free(dtom(so)); 98 } 99 100 /* 101 * Close a socket on last file table reference removal. 102 * Initiate disconnect if connected. 103 * Free socket when disconnect complete. 104 */ 105 soclose(so) 106 register struct socket *so; 107 { 108 int s = splnet(); /* conservative */ 109 110 COUNT(SOCLOSE); 111 if (so->so_pcb == 0) 112 goto discard; 113 if (so->so_state & SS_ISCONNECTED) { 114 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 115 u.u_error = sodisconnect(so, (struct sockaddr *)0); 116 if (u.u_error) { 117 splx(s); 118 return; 119 } 120 } 121 if (so->so_options & SO_LETDATADRAIN) { 122 if ((so->so_state & SS_ISDISCONNECTING) && 123 (so->so_options & SO_NBIO)) { 124 u.u_error = EINPROGRESS; 125 splx(s); 126 return; 127 } 128 while (so->so_state & SS_ISCONNECTED) 129 sleep((caddr_t)&so->so_timeo, PZERO+1); 130 } 131 } 132 u.u_error = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 0, 0); 133 discard: 134 so->so_state |= SS_USERGONE; 135 sofree(so); 136 splx(s); 137 } 138 139 sosplice(pso, so) 140 struct socket *pso, *so; 141 { 142 143 COUNT(SOSPLICE); 144 if (pso->so_proto->pr_family != PF_UNIX) { 145 struct socket *tso; 146 tso = pso; pso = so; so = tso; 147 } 148 if (pso->so_proto->pr_family != PF_UNIX) 149 return (EOPNOTSUPP); 150 /* check types and buffer space */ 151 /* merge buffers */ 152 return (0); 153 } 154 155 /*ARGSUSED*/ 156 sostat(so, sb) 157 struct socket *so; 158 struct stat *sb; 159 { 160 161 COUNT(SOSTAT); 162 bzero((caddr_t)sb, sizeof (*sb)); /* XXX */ 163 return (0); /* XXX */ 164 } 165 166 /* 167 * Accept connection on a socket. 168 */ 169 soaccept(so, asa) 170 struct socket *so; 171 struct sockaddr *asa; 172 { 173 int s = splnet(); 174 int error; 175 176 COUNT(SOACCEPT); 177 if ((so->so_options & SO_ACCEPTCONN) == 0) { 178 error = EINVAL; /* XXX */ 179 goto bad; 180 } 181 if ((so->so_state & SS_CONNAWAITING) == 0) { 182 error = ENOTCONN; 183 goto bad; 184 } 185 so->so_state &= ~SS_CONNAWAITING; 186 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 0, (caddr_t)asa); 187 bad: 188 splx(s); 189 return (error); 190 } 191 192 /* 193 * Connect socket to a specified address. 194 * If already connected or connecting, then avoid 195 * the protocol entry, to keep its job simpler. 196 */ 197 soconnect(so, asa) 198 struct socket *so; 199 struct sockaddr *asa; 200 { 201 int s = splnet(); 202 int error; 203 204 COUNT(SOCONNECT); 205 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) { 206 error = EISCONN; 207 goto bad; 208 } 209 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 0, (caddr_t)asa); 210 bad: 211 splx(s); 212 return (error); 213 } 214 215 /* 216 * Disconnect from a socket. 217 * Address parameter is from system call for later multicast 218 * protocols. Check to make sure that connected and no disconnect 219 * in progress (for protocol's sake), and then invoke protocol. 220 */ 221 sodisconnect(so, asa) 222 struct socket *so; 223 struct sockaddr *asa; 224 { 225 int s = splnet(); 226 int error; 227 228 COUNT(SODISCONNECT); 229 if ((so->so_state & SS_ISCONNECTED) == 0) { 230 error = ENOTCONN; 231 goto bad; 232 } 233 if (so->so_state & SS_ISDISCONNECTING) { 234 error = EALREADY; 235 goto bad; 236 } 237 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 0, asa); 238 bad: 239 splx(s); 240 return (error); 241 } 242 243 /* 244 * Send on a socket. 245 * If send must go all at once and message is larger than 246 * send buffering, then hard error. 247 * Lock against other senders. 248 * If must go all at once and not enough room now, then 249 * inform user that this would block and do nothing. 250 */ 251 sosend(so, asa) 252 register struct socket *so; 253 struct sockaddr *asa; 254 { 255 struct mbuf *top = 0; 256 register struct mbuf *m, **mp = ⊤ 257 register u_int len; 258 int error = 0, space, s; 259 260 COUNT(SOSEND); 261 if (so->so_state & SS_CANTSENDMORE) 262 return (EPIPE); 263 if (sosendallatonce(so) && u.u_count > so->so_snd.sb_hiwat) 264 return (EMSGSIZE); 265 if ((so->so_snd.sb_flags & SB_LOCK) && (so->so_options & SO_NBIO)) 266 return (EWOULDBLOCK); 267 sblock(&so->so_snd); 268 #define snderr(errno) { error = errno; splx(s); goto release; } 269 270 s = splnet(); 271 again: 272 if (so->so_error) { 273 error = so->so_error; 274 so->so_error = 0; 275 splx(s); 276 goto release; 277 } 278 if ((so->so_state & SS_ISCONNECTED) == 0) { 279 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 280 snderr(ENOTCONN); 281 if (asa == 0) 282 snderr(EDESTADDRREQ); 283 } 284 if (top) { 285 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, top, asa); 286 if (error) { 287 splx(s); 288 goto release; 289 } 290 top = 0; 291 mp = ⊤ 292 } 293 if (u.u_count == 0) { 294 splx(s); 295 goto release; 296 } 297 space = sbspace(&so->so_snd); 298 if (space == 0 || sosendallatonce(so) && space < u.u_count) { 299 if (so->so_options & SO_NBIO) 300 snderr(EWOULDBLOCK); 301 sbunlock(&so->so_snd); 302 sbwait(&so->so_snd); 303 splx(s); 304 goto again; 305 } 306 splx(s); 307 while (u.u_count && space > 0) { 308 MGET(m, 1); 309 if (m == NULL) { 310 error = ENOBUFS; 311 m_freem(top); 312 goto release; 313 } 314 if (u.u_count >= CLBYTES && space >= CLBYTES) { 315 register struct mbuf *p; 316 MCLGET(p, 1); 317 if (p == 0) 318 goto nopages; 319 m->m_off = (int)p - (int)m; 320 len = CLBYTES; 321 } else { 322 nopages: 323 m->m_off = MMINOFF; 324 len = MIN(MLEN, u.u_count); 325 } 326 iomove(mtod(m, caddr_t), len, B_WRITE); 327 m->m_len = len; 328 *mp = m; 329 mp = &m->m_next; 330 space = sbspace(&so->so_snd); 331 } 332 s = splnet(); 333 goto again; 334 335 release: 336 sbunlock(&so->so_snd); 337 return (error); 338 } 339 340 soreceive(so, asa) 341 register struct socket *so; 342 struct sockaddr *asa; 343 { 344 register struct mbuf *m, *n; 345 u_int len; 346 int eor, s, error = 0; 347 348 COUNT(SORECEIVE); 349 restart: 350 sblock(&so->so_rcv); 351 s = splnet(); 352 353 #define rcverr(errno) { error = errno; splx(s); goto release; } 354 if (so->so_rcv.sb_cc == 0) { 355 if (so->so_error) { 356 error = so->so_error; 357 so->so_error = 0; 358 splx(s); 359 goto release; 360 } 361 if (so->so_state & SS_CANTRCVMORE) { 362 splx(s); 363 goto release; 364 } 365 if ((so->so_state & SS_ISCONNECTED) == 0 && 366 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 367 rcverr(ENOTCONN); 368 if (so->so_options & SO_NBIO) 369 rcverr(EWOULDBLOCK); 370 sbunlock(&so->so_rcv); 371 sbwait(&so->so_rcv); 372 splx(s); 373 goto restart; 374 } 375 m = so->so_rcv.sb_mb; 376 if (m == 0) 377 panic("receive"); 378 if (so->so_proto->pr_flags & PR_ADDR) { 379 if (m->m_len != sizeof (struct sockaddr)) 380 panic("soreceive addr"); 381 if (asa) 382 bcopy(mtod(m, caddr_t), (caddr_t)asa, sizeof (*asa)); 383 so->so_rcv.sb_cc -= m->m_len; 384 so->so_rcv.sb_mbcnt -= MSIZE; 385 m = m_free(m); 386 if (m == 0) 387 panic("receive 2"); 388 so->so_rcv.sb_mb = m; 389 } 390 eor = 0; 391 do { 392 len = MIN(m->m_len, u.u_count); 393 if (len == m->m_len) { 394 eor = (int)m->m_act; 395 sbfree(&so->so_rcv, m); 396 so->so_rcv.sb_mb = m->m_next; 397 } 398 splx(s); 399 iomove(mtod(m, caddr_t), len, B_READ); 400 s = splnet(); 401 if (len == m->m_len) { 402 MFREE(m, n); 403 } else { 404 m->m_off += len; 405 m->m_len -= len; 406 so->so_rcv.sb_cc -= len; 407 } 408 } while ((m = so->so_rcv.sb_mb) && u.u_count && !eor); 409 if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0) 410 do { 411 if (m == 0) 412 panic("receive 3"); 413 sbfree(&so->so_rcv, m); 414 eor = (int)m->m_act; 415 so->so_rcv.sb_mb = m->m_next; 416 MFREE(m, n); 417 m = n; 418 } while (eor == 0); 419 if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb) 420 (*so->so_proto->pr_usrreq)(so, PRU_RCVD, 0, 0); 421 release: 422 sbunlock(&so->so_rcv); 423 splx(s); 424 return (error); 425 } 426 427 /*ARGSUSED*/ 428 soioctl(so, cmd, cmdp) 429 register struct socket *so; 430 int cmd; 431 register caddr_t cmdp; 432 { 433 434 COUNT(SOIOCTL); 435 switch (cmd) { 436 437 case SIOCDONE: { 438 int flags; 439 if (copyin(cmdp, (caddr_t)&flags, sizeof (flags))) { 440 u.u_error = EFAULT; 441 return; 442 } 443 if (flags & FREAD) { 444 int s = splimp(); 445 socantrcvmore(so); 446 sbflush(&so->so_rcv); 447 } 448 if (flags & FWRITE) 449 u.u_error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, (struct mbuf *)0, 0); 450 return; 451 } 452 453 } 454 switch (so->so_type) { 455 456 case SOCK_STREAM: 457 break; 458 459 case SOCK_DGRAM: 460 break; 461 462 case SOCK_RDM: 463 break; 464 465 case SOCK_RAW: 466 break; 467 468 } 469 } 470