| 1 | /* uipc_usrreq.c 1.5 82/12/14 */ |
| 2 | |
| 3 | #include "../h/param.h" |
| 4 | #include "../h/dir.h" |
| 5 | #include "../h/user.h" |
| 6 | #include "../h/mbuf.h" |
| 7 | #include "../h/protosw.h" |
| 8 | #include "../h/socket.h" |
| 9 | #include "../h/socketvar.h" |
| 10 | #include "../h/unpcb.h" |
| 11 | #include "../h/un.h" |
| 12 | #include "../h/inode.h" |
| 13 | #include "../h/nami.h" |
| 14 | |
| 15 | /* |
| 16 | * Unix communications domain. |
| 17 | */ |
| 18 | |
| 19 | /*ARGSUSED*/ |
| 20 | uipc_usrreq(so, req, m, nam, opt) |
| 21 | struct socket *so; |
| 22 | int req; |
| 23 | struct mbuf *m, *nam; |
| 24 | struct socketopt *opt; |
| 25 | { |
| 26 | struct unpcb *unp = sotounpcb(so); |
| 27 | register struct socket *so2; |
| 28 | int error = 0; |
| 29 | |
| 30 | if (unp == 0 && req != PRU_ATTACH) |
| 31 | return (EINVAL); /* XXX */ |
| 32 | switch (req) { |
| 33 | |
| 34 | case PRU_ATTACH: |
| 35 | if (unp) { |
| 36 | error = EISCONN; |
| 37 | break; |
| 38 | } |
| 39 | error = unp_attach(so); |
| 40 | break; |
| 41 | |
| 42 | case PRU_DETACH: |
| 43 | unp_detach(unp); |
| 44 | break; |
| 45 | |
| 46 | case PRU_BIND: |
| 47 | error = unp_bind(unp, nam); |
| 48 | break; |
| 49 | |
| 50 | case PRU_LISTEN: |
| 51 | if (unp->unp_inode == 0) |
| 52 | error = EINVAL; |
| 53 | break; |
| 54 | |
| 55 | case PRU_CONNECT: |
| 56 | error = unp_connect(so, nam); |
| 57 | break; |
| 58 | |
| 59 | case PRU_DISCONNECT: |
| 60 | unp_disconnect(unp); |
| 61 | break; |
| 62 | |
| 63 | case PRU_ACCEPT: |
| 64 | nam->m_len = unp->unp_remaddr->m_len; |
| 65 | bcopy(mtod(unp->unp_remaddr, caddr_t), |
| 66 | mtod(nam, caddr_t), (unsigned)nam->m_len); |
| 67 | break; |
| 68 | |
| 69 | case PRU_SHUTDOWN: |
| 70 | socantsendmore(so); |
| 71 | unp_usrclosed(unp); |
| 72 | break; |
| 73 | |
| 74 | case PRU_RCVD: |
| 75 | switch (so->so_type) { |
| 76 | |
| 77 | case SOCK_DGRAM: |
| 78 | panic("uipc 1"); |
| 79 | |
| 80 | case SOCK_STREAM: { |
| 81 | #define rcv (&so->so_rcv) |
| 82 | #define snd (&so2->so_snd) |
| 83 | if (unp->unp_conn == 0) |
| 84 | break; |
| 85 | so2 = unp->unp_conn->unp_socket; |
| 86 | /* |
| 87 | * Transfer resources back to send port |
| 88 | * and wakeup any waiting to write. |
| 89 | */ |
| 90 | snd->sb_mbmax += rcv->sb_mbmax - rcv->sb_mbcnt; |
| 91 | rcv->sb_mbmax = rcv->sb_mbcnt; |
| 92 | snd->sb_hiwat += rcv->sb_hiwat - rcv->sb_cc; |
| 93 | rcv->sb_hiwat = rcv->sb_cc; |
| 94 | sbwakeup(snd); |
| 95 | #undef snd |
| 96 | #undef rcv |
| 97 | } |
| 98 | break; |
| 99 | |
| 100 | default: |
| 101 | panic("uipc 2"); |
| 102 | } |
| 103 | break; |
| 104 | |
| 105 | case PRU_SEND: |
| 106 | switch (so->so_type) { |
| 107 | |
| 108 | case SOCK_DGRAM: |
| 109 | if (nam) { |
| 110 | if (unp->unp_conn) { |
| 111 | error = EISCONN; |
| 112 | break; |
| 113 | } |
| 114 | error = unp_connect(so, nam); |
| 115 | if (error) |
| 116 | break; |
| 117 | } else { |
| 118 | if (unp->unp_conn == 0) { |
| 119 | error = ENOTCONN; |
| 120 | break; |
| 121 | } |
| 122 | } |
| 123 | so2 = unp->unp_conn->unp_socket; |
| 124 | /* BEGIN XXX */ |
| 125 | if (sbspace(&so2->so_rcv) > 0) |
| 126 | (void) sbappendaddr(&so2->so_rcv, |
| 127 | mtod(nam, struct sockaddr *), m); |
| 128 | /* END XXX */ |
| 129 | if (nam) |
| 130 | unp_disconnect(unp); |
| 131 | break; |
| 132 | |
| 133 | case SOCK_STREAM: |
| 134 | #define rcv (&so2->so_rcv) |
| 135 | #define snd (&so->so_snd) |
| 136 | if (unp->unp_conn == 0) |
| 137 | panic("uipc 3"); |
| 138 | so2 = unp->unp_conn->unp_socket; |
| 139 | /* |
| 140 | * Send to paired receive port, and then |
| 141 | * give it enough resources to hold what it already has. |
| 142 | * Wake up readers. |
| 143 | */ |
| 144 | sbappend(rcv, m); |
| 145 | snd->sb_mbmax -= rcv->sb_mbcnt - rcv->sb_mbmax; |
| 146 | rcv->sb_mbmax = rcv->sb_mbcnt; |
| 147 | snd->sb_hiwat -= rcv->sb_cc - rcv->sb_hiwat; |
| 148 | rcv->sb_hiwat = rcv->sb_cc; |
| 149 | sbwakeup(rcv); |
| 150 | #undef snd |
| 151 | #undef rcv |
| 152 | break; |
| 153 | |
| 154 | default: |
| 155 | panic("uipc 4"); |
| 156 | } |
| 157 | break; |
| 158 | |
| 159 | case PRU_ABORT: |
| 160 | unp_drop(unp, ECONNABORTED); |
| 161 | break; |
| 162 | |
| 163 | /* SOME AS YET UNIMPLEMENTED HOOKS */ |
| 164 | case PRU_CONTROL: |
| 165 | error = EOPNOTSUPP; |
| 166 | break; |
| 167 | |
| 168 | case PRU_SENSE: |
| 169 | error = EOPNOTSUPP; |
| 170 | break; |
| 171 | /* END UNIMPLEMENTED HOOKS */ |
| 172 | |
| 173 | case PRU_RCVOOB: |
| 174 | break; |
| 175 | |
| 176 | case PRU_SENDOOB: |
| 177 | break; |
| 178 | |
| 179 | case PRU_SOCKADDR: |
| 180 | break; |
| 181 | |
| 182 | case PRU_SLOWTIMO: |
| 183 | break; |
| 184 | |
| 185 | default: |
| 186 | panic("piusrreq"); |
| 187 | } |
| 188 | return (0); |
| 189 | } |
| 190 | |
| 191 | int unp_sendspace = 1024*2; |
| 192 | int unp_recvspace = 1024*2; |
| 193 | |
| 194 | unp_attach(so) |
| 195 | struct socket *so; |
| 196 | { |
| 197 | register struct mbuf *m; |
| 198 | register struct unpcb *unp; |
| 199 | int error; |
| 200 | |
| 201 | error = soreserve(so, unp_sendspace, unp_recvspace); |
| 202 | if (error) |
| 203 | goto bad; |
| 204 | m = m_getclr(M_DONTWAIT, MT_PCB); |
| 205 | if (m == 0) { |
| 206 | error = ENOBUFS; |
| 207 | goto bad; |
| 208 | } |
| 209 | unp = mtod(m, struct unpcb *); |
| 210 | so->so_pcb = (caddr_t)unp; |
| 211 | unp->unp_socket = so; |
| 212 | return (0); |
| 213 | bad: |
| 214 | return (error); |
| 215 | } |
| 216 | |
| 217 | unp_detach(unp) |
| 218 | register struct unpcb *unp; |
| 219 | { |
| 220 | |
| 221 | if (unp->unp_inode) { |
| 222 | irele(unp->unp_inode); |
| 223 | unp->unp_inode = 0; |
| 224 | } |
| 225 | if (unp->unp_conn) |
| 226 | unp_disconnect(unp); |
| 227 | while (unp->unp_refs) |
| 228 | unp_drop(unp->unp_refs, ECONNRESET); |
| 229 | soisdisconnected(unp->unp_socket); |
| 230 | unp->unp_socket->so_pcb = 0; |
| 231 | m_freem(unp->unp_remaddr); |
| 232 | (void) m_free(dtom(unp)); |
| 233 | } |
| 234 | |
| 235 | unp_bind(unp, nam) |
| 236 | struct unpcb *unp; |
| 237 | struct mbuf *nam; |
| 238 | { |
| 239 | struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); |
| 240 | register struct inode *ip; |
| 241 | extern schar(); |
| 242 | int error; |
| 243 | |
| 244 | u.u_dirp = soun->sun_path; |
| 245 | soun->sun_path[sizeof(soun->sun_path)-1] = 0; |
| 246 | ip = namei(schar, CREATE, 1); |
| 247 | if (ip) { |
| 248 | iput(ip); |
| 249 | return (EEXIST); |
| 250 | } |
| 251 | ip = maknode(IFSOCK | 0777); |
| 252 | if (ip == NULL) { |
| 253 | error = u.u_error; /* XXX */ |
| 254 | u.u_error = 0; /* XXX */ |
| 255 | return (error); |
| 256 | } |
| 257 | ip->i_socket = unp->unp_socket; |
| 258 | unp->unp_inode = ip; |
| 259 | iunlock(ip); /* but keep reference */ |
| 260 | return (0); |
| 261 | } |
| 262 | |
| 263 | unp_connect(so, nam) |
| 264 | struct socket *so; |
| 265 | struct mbuf *nam; |
| 266 | { |
| 267 | register struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); |
| 268 | struct unpcb *unp = sotounpcb(so); |
| 269 | register struct inode *ip; |
| 270 | int error; |
| 271 | struct socket *so2; |
| 272 | struct unpcb *unp2; |
| 273 | |
| 274 | u.u_dirp = soun->sun_path; |
| 275 | soun->sun_path[sizeof(soun->sun_path)-1] = 0; |
| 276 | ip = namei(schar, LOOKUP, 1); |
| 277 | if (ip == 0) { |
| 278 | error = u.u_error; |
| 279 | u.u_error = 0; |
| 280 | return (ENOENT); |
| 281 | } |
| 282 | if ((ip->i_mode&IFMT) != IFSOCK) { |
| 283 | error = ENOTSOCK; |
| 284 | goto bad; |
| 285 | } |
| 286 | so2 = ip->i_socket; |
| 287 | if (so2 == 0) { |
| 288 | error = ECONNREFUSED; |
| 289 | goto bad; |
| 290 | } |
| 291 | if (so2->so_type != so->so_type) { |
| 292 | error = EPROTOTYPE; |
| 293 | goto bad; |
| 294 | } |
| 295 | switch (so->so_type) { |
| 296 | |
| 297 | case SOCK_DGRAM: |
| 298 | unp->unp_conn = sotounpcb(so2); |
| 299 | unp2 = sotounpcb(so2); |
| 300 | unp->unp_nextref = unp2->unp_refs; |
| 301 | unp2->unp_refs = unp; |
| 302 | break; |
| 303 | |
| 304 | case SOCK_STREAM: |
| 305 | if ((so2->so_options&SO_ACCEPTCONN) == 0 || |
| 306 | (so2 = sonewconn(so2)) == 0) { |
| 307 | error = ECONNREFUSED; |
| 308 | goto bad; |
| 309 | } |
| 310 | unp2 = sotounpcb(so2); |
| 311 | unp->unp_conn = unp2; |
| 312 | unp2->unp_conn = unp; |
| 313 | unp2->unp_remaddr = m_copy(nam, 0, (int)M_COPYALL); |
| 314 | break; |
| 315 | |
| 316 | default: |
| 317 | panic("uipc connip"); |
| 318 | } |
| 319 | soisconnected(so2); |
| 320 | soisconnected(so); |
| 321 | iput(ip); |
| 322 | return (0); |
| 323 | bad: |
| 324 | iput(ip); |
| 325 | return (error); |
| 326 | } |
| 327 | |
| 328 | unp_disconnect(unp) |
| 329 | struct unpcb *unp; |
| 330 | { |
| 331 | register struct unpcb *unp2 = unp->unp_conn; |
| 332 | |
| 333 | if (unp2 == 0) |
| 334 | return; |
| 335 | unp->unp_conn = 0; |
| 336 | soisdisconnected(unp->unp_socket); |
| 337 | switch (unp->unp_socket->so_type) { |
| 338 | |
| 339 | case SOCK_DGRAM: |
| 340 | if (unp2->unp_refs == unp) |
| 341 | unp2->unp_refs = unp->unp_nextref; |
| 342 | else { |
| 343 | unp2 = unp2->unp_refs; |
| 344 | for (;;) { |
| 345 | if (unp2 == 0) |
| 346 | panic("unp_disconnect"); |
| 347 | if (unp2->unp_nextref == unp) |
| 348 | break; |
| 349 | unp2 = unp2->unp_nextref; |
| 350 | } |
| 351 | unp2->unp_nextref = unp->unp_nextref; |
| 352 | } |
| 353 | unp->unp_nextref = 0; |
| 354 | break; |
| 355 | |
| 356 | case SOCK_STREAM: |
| 357 | unp2->unp_conn = 0; |
| 358 | soisdisconnected(unp2->unp_socket); |
| 359 | break; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | unp_abort(unp) |
| 364 | struct unpcb *unp; |
| 365 | { |
| 366 | |
| 367 | unp_detach(unp); |
| 368 | } |
| 369 | |
| 370 | /*ARGSUSED*/ |
| 371 | unp_usrclosed(unp) |
| 372 | struct unpcb *unp; |
| 373 | { |
| 374 | |
| 375 | } |
| 376 | |
| 377 | unp_drop(unp, errno) |
| 378 | struct unpcb *unp; |
| 379 | int errno; |
| 380 | { |
| 381 | |
| 382 | unp->unp_socket->so_error = errno; |
| 383 | unp_disconnect(unp); |
| 384 | } |
| 385 | |
| 386 | unp_drain() |
| 387 | { |
| 388 | |
| 389 | } |