1 /* uipc_socket.c 4.12 81/11/22 */ 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 "../net/inet.h" 17 #include "../net/inet_systm.h" 18 19 /* 20 * Socket support routines. 21 * 22 * DEAL WITH INTERRUPT NOTIFICATION. 23 */ 24 25 /* 26 * Create a socket. 27 */ 28 socreate(aso, type, asp, asa, options) 29 struct socket **aso; 30 int type; 31 struct sockproto *asp; 32 struct sockaddr *asa; 33 int options; 34 { 35 register struct protosw *prp; 36 register struct socket *so; 37 struct mbuf *m; 38 int pf, proto, error; 39 COUNT(SOCREATE); 40 41 /* 42 * Use process standard protocol/protocol family if none 43 * specified by address argument. 44 */ 45 if (asp == 0) { 46 pf = PF_INET; /* should be u.u_protof */ 47 proto = 0; 48 } else { 49 pf = asp->sp_family; 50 proto = asp->sp_protocol; 51 } 52 53 /* 54 * If protocol specified, look for it, otherwise 55 * for a protocol of the correct type in the right family. 56 */ 57 if (proto) 58 prp = pffindproto(pf, proto); 59 else 60 prp = pffindtype(pf, type); 61 if (prp == 0) 62 return (EPROTONOSUPPORT); 63 64 /* 65 * Get a socket structure. 66 */ 67 m = m_getclr(M_WAIT); 68 if (m == 0) 69 return (ENOBUFS); 70 so = mtod(m, struct socket *); 71 so->so_options = options; 72 73 /* 74 * Attach protocol to socket, initializing 75 * and reserving resources. 76 */ 77 so->so_proto = prp; 78 error = (*prp->pr_usrreq)(so, PRU_ATTACH, 0, asa); 79 if (error) { 80 (void) m_free(dtom(so)); 81 return (error); 82 } 83 *aso = so; 84 return (0); 85 } 86 87 sofree(so) 88 struct socket *so; 89 { 90 91 COUNT(SOFREE); 92 if (so->so_pcb || (so->so_state & SS_USERGONE) == 0) 93 return; 94 sbrelease(&so->so_snd); 95 sbrelease(&so->so_rcv); 96 (void) m_free(dtom(so)); 97 } 98 99 /* 100 * Close a socket on last file table reference removal. 101 * Initiate disconnect if connected. 102 * Free socket when disconnect complete. 103 */ 104 soclose(so) 105 register struct socket *so; 106 { 107 int s = splnet(); /* conservative */ 108 109 COUNT(SOCLOSE); 110 if (so->so_pcb == 0) 111 goto discard; 112 if (so->so_state & SS_ISCONNECTED) { 113 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 114 u.u_error = sodisconnect(so, (struct sockaddr *)0); 115 if (u.u_error) { 116 splx(s); 117 return; 118 } 119 } 120 if ((so->so_state & SS_ISDISCONNECTING) && 121 (so->so_options & SO_NBIO)) { 122 u.u_error = EINPROGRESS; 123 splx(s); 124 return; 125 } 126 while (so->so_state & SS_ISCONNECTED) 127 sleep((caddr_t)&so->so_timeo, PZERO+1); 128 } 129 u.u_error = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 0, 0); 130 discard: 131 so->so_state |= SS_USERGONE; 132 sofree(so); 133 splx(s); 134 } 135 136 sosplice(pso, so) 137 struct socket *pso, *so; 138 { 139 140 COUNT(SOSPLICE); 141 if (pso->so_proto->pr_family != PF_LOCAL) { 142 struct socket *tso; 143 tso = pso; pso = so; so = tso; 144 } 145 if (pso->so_proto->pr_family != PF_LOCAL) 146 return (EOPNOTSUPP); 147 /* check types and buffer space */ 148 /* merge buffers */ 149 return (0); 150 } 151 152 /*ARGSUSED*/ 153 sostat(so, sb) 154 struct socket *so; 155 struct stat *sb; 156 { 157 158 COUNT(SOSTAT); 159 return (EOPNOTSUPP); 160 } 161 162 /* 163 * Accept connection on a socket. 164 */ 165 soaccept(so, asa) 166 struct socket *so; 167 struct sockaddr *asa; 168 { 169 int s = splnet(); 170 int error; 171 172 COUNT(SOACCEPT); 173 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) { 174 error = EISCONN; 175 goto bad; 176 } 177 if ((so->so_options & SO_ACCEPTCONN) == 0) { 178 error = EINVAL; /* XXX */ 179 goto bad; 180 } 181 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 0, (caddr_t)asa); 182 bad: 183 splx(s); 184 return (error); 185 } 186 187 /* 188 * Connect socket to a specified address. 189 * If already connected or connecting, then avoid 190 * the protocol entry, to keep its job simpler. 191 */ 192 soconnect(so, asa) 193 struct socket *so; 194 struct sockaddr *asa; 195 { 196 int s = splnet(); 197 int error; 198 199 COUNT(SOCONNECT); 200 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) { 201 error = EISCONN; 202 goto bad; 203 } 204 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 0, (caddr_t)asa); 205 bad: 206 splx(s); 207 return (error); 208 } 209 210 /* 211 * Disconnect from a socket. 212 * Address parameter is from system call for later multicast 213 * protocols. Check to make sure that connected and no disconnect 214 * in progress (for protocol's sake), and then invoke protocol. 215 */ 216 sodisconnect(so, asa) 217 struct socket *so; 218 struct sockaddr *asa; 219 { 220 int s = splnet(); 221 int error; 222 223 COUNT(SODISCONNECT); 224 if ((so->so_state & SS_ISCONNECTED) == 0) { 225 error = ENOTCONN; 226 goto bad; 227 } 228 if (so->so_state & SS_ISDISCONNECTING) { 229 error = EALREADY; 230 goto bad; 231 } 232 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 0, asa); 233 bad: 234 splx(s); 235 return (error); 236 } 237 238 /* 239 * Send on a socket. 240 * If send must go all at once and message is larger than 241 * send buffering, then hard error. 242 * Lock against other senders. 243 * If must go all at once and not enough room now, then 244 * inform user that this would block and do nothing. 245 */ 246 sosend(so, asa) 247 register struct socket *so; 248 struct sockaddr *asa; 249 { 250 struct mbuf *top = 0; 251 register struct mbuf *m, **mp = ⊤ 252 register u_int len; 253 int error = 0, space, s; 254 255 COUNT(SOSEND); 256 if (so->so_state & SS_CANTSENDMORE) 257 return (EPIPE); 258 if (sosendallatonce(so) && u.u_count > so->so_snd.sb_hiwat) 259 return (EMSGSIZE); 260 if ((so->so_snd.sb_flags & SB_LOCK) && (so->so_options & SO_NBIO)) 261 return (EWOULDBLOCK); 262 sblock(&so->so_snd); 263 #define snderr(errno) { error = errno; splx(s); goto release; } 264 265 s = splnet(); 266 again: 267 if ((so->so_state & SS_ISCONNECTED) == 0) { 268 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 269 snderr(ENOTCONN); 270 if (asa == 0) 271 snderr(EDESTADDRREQ); 272 } 273 if (so->so_error) 274 snderr(so->so_error); 275 if (top) { 276 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, top, asa); 277 if (error) { 278 splx(s); 279 goto release; 280 } 281 top = 0; 282 mp = ⊤ 283 } 284 if (u.u_count == 0) { 285 splx(s); 286 goto release; 287 } 288 space = sbspace(&so->so_snd); 289 if (space == 0 || sosendallatonce(so) && space < u.u_count) { 290 if (so->so_options & SO_NBIO) 291 snderr(EWOULDBLOCK); 292 sbunlock(&so->so_snd); 293 sbwait(&so->so_snd); 294 splx(s); 295 goto again; 296 } 297 splx(s); 298 while (u.u_count && space > 0) { 299 MGET(m, 1); 300 if (m == NULL) { 301 error = ENOBUFS; 302 m_freem(top); 303 goto release; 304 } 305 if (u.u_count >= PGSIZE && space >= NMBPG) { 306 register struct mbuf *p; 307 MPGET(p, 1); 308 if (p == 0) 309 goto nopages; 310 m->m_off = (int)p - (int)m; 311 len = PGSIZE; 312 } else { 313 nopages: 314 m->m_off = MMINOFF; 315 len = MIN(MLEN, u.u_count); 316 } 317 iomove(mtod(m, caddr_t), len, B_WRITE); 318 m->m_len = len; 319 *mp = m; 320 mp = &m->m_next; 321 space = sbspace(&so->so_snd); 322 } 323 s = splnet(); 324 goto again; 325 326 release: 327 sbunlock(&so->so_snd); 328 return (error); 329 } 330 331 soreceive(so, asa) 332 register struct socket *so; 333 struct sockaddr *asa; 334 { 335 register struct mbuf *m, *n; 336 u_int len; 337 int eor, s, error = 0; 338 339 COUNT(SORECEIVE); 340 restart: 341 sblock(&so->so_rcv); 342 s = splnet(); 343 344 #define rcverr(errno) { error = errno; splx(s); goto release; } 345 if (so->so_rcv.sb_cc == 0) { 346 if (so->so_state & SS_CANTRCVMORE) { 347 splx(s); 348 goto release; 349 } 350 if ((so->so_state & SS_ISCONNECTED) == 0 && 351 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 352 rcverr(ENOTCONN); 353 if (so->so_options & SO_NBIO) 354 rcverr (EWOULDBLOCK); 355 sbunlock(&so->so_rcv); 356 sbwait(&so->so_rcv); 357 splx(s); 358 goto restart; 359 } 360 m = so->so_rcv.sb_mb; 361 if (m == 0) 362 panic("receive"); 363 if ((so->so_proto->pr_flags & PR_ADDR)) { 364 if (asa) { 365 so->so_rcv.sb_cc -= m->m_len; 366 len = MIN(m->m_len, sizeof (struct sockaddr)); 367 bcopy(mtod(m, caddr_t), (caddr_t)asa, len); 368 } else 369 bzero((caddr_t)asa, sizeof (*asa)); 370 m = m_free(m); 371 if (m == 0) 372 panic("receive 2"); 373 so->so_rcv.sb_mb = m; 374 } 375 eor = 0; 376 do { 377 len = MIN(m->m_len, u.u_count); 378 if (len == m->m_len) { 379 eor = (int)m->m_act; 380 sbfree(&so->so_rcv, m); 381 } 382 splx(s); 383 iomove(mtod(m, caddr_t), len, B_READ); 384 s = splnet(); 385 if (len == m->m_len) { 386 MFREE(m, n); 387 so->so_rcv.sb_mb = n; 388 } else { 389 m->m_off += len; 390 m->m_len -= len; 391 so->so_rcv.sb_cc -= len; 392 } 393 } while ((m = so->so_rcv.sb_mb) && u.u_count && !eor); 394 if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0) 395 do { 396 if (m == 0) 397 panic("receive 3"); 398 sbfree(&so->so_rcv, m); 399 eor = (int)m->m_act; 400 so->so_rcv.sb_mb = m->m_next; 401 MFREE(m, n); 402 m = n; 403 } while (eor == 0); 404 if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb) 405 (*so->so_proto->pr_usrreq)(so, PRU_RCVD, 0, 0); 406 release: 407 sbunlock(&so->so_rcv); 408 splx(s); 409 return (error); 410 } 411 412 /*ARGSUSED*/ 413 soioctl(so, cmd, cmdp) 414 register struct socket *so; 415 int cmd; 416 register caddr_t cmdp; 417 { 418 419 COUNT(SOIOCTL); 420 switch (cmdp) { 421 422 } 423 switch (so->so_type) { 424 425 case SOCK_STREAM: 426 break; 427 428 case SOCK_DGRAM: 429 break; 430 431 case SOCK_RDM: 432 break; 433 434 case SOCK_RAW: 435 break; 436 437 } 438 } 439