1 /* uipc_socket.c 4.9 81/11/21 */ 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 if (sosendallatonce(so) && sbspace(&so->so_snd) < u.u_count) { 289 if (so->so_options & SO_NBIO) 290 snderr(EWOULDBLOCK); 291 sbunlock(&so->so_snd); 292 sbwait(&so->so_snd); 293 splx(s); 294 goto again; 295 } 296 splx(s); 297 while (u.u_count && (space = sbspace(&so->so_snd)) > 0) { 298 MGET(m, 1); 299 if (m == NULL) { 300 error = ENOBUFS; 301 m_freem(top); 302 goto release; 303 } 304 if (u.u_count >= PGSIZE && space >= NMBPG) { 305 register struct mbuf *p; 306 MPGET(p, 1); 307 if (p == 0) 308 goto nopages; 309 m->m_off = (int)p - (int)m; 310 len = PGSIZE; 311 } else { 312 nopages: 313 m->m_off = MMINOFF; 314 len = MIN(MLEN, u.u_count); 315 } 316 iomove(mtod(m, caddr_t), len, B_WRITE); 317 m->m_len = len; 318 *mp = m; 319 mp = &m->m_next; 320 } 321 s = splnet(); 322 goto again; 323 324 release: 325 sbunlock(&so->so_snd); 326 return (error); 327 } 328 329 soreceive(so, asa) 330 register struct socket *so; 331 struct sockaddr *asa; 332 { 333 register struct mbuf *m, *n; 334 u_int len; 335 int eor, s, error = 0; 336 337 COUNT(SORECEIVE); 338 restart: 339 sblock(&so->so_rcv); 340 s = splnet(); 341 342 #define rcverr(errno) { error = errno; splx(s); goto release; } 343 if (so->so_rcv.sb_cc == 0) { 344 if ((so->so_state & SS_ISCONNECTED) == 0 && 345 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 346 rcverr(ENOTCONN); 347 if (so->so_state & SS_CANTRCVMORE) { 348 splx(s); 349 goto release; 350 } 351 if (so->so_options & SO_NBIO) 352 rcverr (EWOULDBLOCK); 353 sbunlock(&so->so_rcv); 354 sbwait(&so->so_rcv); 355 goto restart; 356 } 357 m = so->so_rcv.sb_mb; 358 if (m == 0) 359 panic("receive"); 360 if ((so->so_proto->pr_flags & PR_ADDR)) { 361 so->so_rcv.sb_mb = m->m_next; 362 if (asa) { 363 so->so_rcv.sb_cc -= m->m_len; 364 len = MIN(m->m_len, sizeof (struct sockaddr)); 365 bcopy(mtod(m, caddr_t), (caddr_t)asa, len); 366 } else 367 bzero((caddr_t)asa, sizeof (*asa)); 368 m = so->so_rcv.sb_mb; 369 if (m == 0) 370 panic("receive 2"); 371 } 372 eor = 0; 373 do { 374 len = MIN(m->m_len, u.u_count); 375 if (len == m->m_len) { 376 eor = (int)m->m_act; 377 sbfree(&so->so_rcv, m); 378 } 379 splx(s); 380 iomove(mtod(m, caddr_t), len, B_READ); 381 s = splnet(); 382 if (len == m->m_len) { 383 MFREE(m, n); 384 } else { 385 m->m_off += len; 386 m->m_len -= len; 387 so->so_rcv.sb_cc -= len; 388 } 389 } while ((m = so->so_rcv.sb_mb) && u.u_count && !eor); 390 if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0) 391 do { 392 if (m == 0) 393 panic("receive 3"); 394 sbfree(&so->so_rcv, m); 395 eor = (int)m->m_act; 396 so->so_rcv.sb_mb = m->m_next; 397 MFREE(m, n); 398 m = n; 399 } while (eor == 0); 400 if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb) 401 (*so->so_proto->pr_usrreq)(so, PRU_RCVD, 0, 0); 402 release: 403 sbunlock(&so->so_rcv); 404 splx(s); 405 return (error); 406 } 407 408 /*ARGSUSED*/ 409 soioctl(so, cmd, cmdp) 410 register struct socket *so; 411 int cmd; 412 register caddr_t cmdp; 413 { 414 415 COUNT(SOIOCTL); 416 switch (cmdp) { 417 418 } 419 switch (so->so_type) { 420 421 case SOCK_STREAM: 422 break; 423 424 case SOCK_DGRAM: 425 break; 426 427 case SOCK_RDM: 428 break; 429 430 case SOCK_RAW: 431 break; 432 433 } 434 } 435