| 1 | /* |
| 2 | * ng_ksocket.c |
| 3 | */ |
| 4 | |
| 5 | /*- |
| 6 | * Copyright (c) 1996-1999 Whistle Communications, Inc. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Subject to the following obligations and disclaimer of warranty, use and |
| 10 | * redistribution of this software, in source or object code forms, with or |
| 11 | * without modifications are expressly permitted by Whistle Communications; |
| 12 | * provided, however, that: |
| 13 | * 1. Any and all reproductions of the source or object code must include the |
| 14 | * copyright notice above and the following disclaimer of warranties; and |
| 15 | * 2. No rights are granted, in any manner or form, to use Whistle |
| 16 | * Communications, Inc. trademarks, including the mark "WHISTLE |
| 17 | * COMMUNICATIONS" on advertising, endorsements, or otherwise except as |
| 18 | * such appears in the above copyright notice or in the software. |
| 19 | * |
| 20 | * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND |
| 21 | * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO |
| 22 | * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, |
| 23 | * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF |
| 24 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. |
| 25 | * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY |
| 26 | * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS |
| 27 | * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. |
| 28 | * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES |
| 29 | * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING |
| 30 | * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
| 31 | * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 32 | * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY |
| 33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 35 | * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY |
| 36 | * OF SUCH DAMAGE. |
| 37 | * |
| 38 | * Author: Archie Cobbs <archie@freebsd.org> |
| 39 | * |
| 40 | * $FreeBSD: src/sys/netgraph/ng_ksocket.c,v 1.61 2008/03/07 21:12:56 mav Exp $ |
| 41 | * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $ |
| 42 | */ |
| 43 | |
| 44 | /* |
| 45 | * Kernel socket node type. This node type is basically a kernel-mode |
| 46 | * version of a socket... kindof like the reverse of the socket node type. |
| 47 | */ |
| 48 | |
| 49 | #include <sys/param.h> |
| 50 | #include <sys/systm.h> |
| 51 | #include <sys/kernel.h> |
| 52 | #include <sys/mbuf.h> |
| 53 | #include <sys/proc.h> |
| 54 | #include <sys/malloc.h> |
| 55 | #include <sys/ctype.h> |
| 56 | #include <sys/protosw.h> |
| 57 | #include <sys/errno.h> |
| 58 | #include <sys/socket.h> |
| 59 | #include <sys/socketvar.h> |
| 60 | #include <sys/uio.h> |
| 61 | #include <sys/un.h> |
| 62 | |
| 63 | #include "ng_message.h" |
| 64 | #include "netgraph.h" |
| 65 | #include "ng_parse.h" |
| 66 | #include "ng_ksocket.h" |
| 67 | |
| 68 | #include <netinet/in.h> |
| 69 | |
| 70 | #ifdef NG_SEPARATE_MALLOC |
| 71 | MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", "netgraph ksock node "); |
| 72 | #else |
| 73 | #define M_NETGRAPH_KSOCKET M_NETGRAPH |
| 74 | #endif |
| 75 | |
| 76 | #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) |
| 77 | #define SADATA_OFFSET (OFFSETOF(struct sockaddr, sa_data)) |
| 78 | |
| 79 | /* Node private data */ |
| 80 | struct ng_ksocket_private { |
| 81 | node_p node; |
| 82 | hook_p hook; |
| 83 | struct socket *so; |
| 84 | int fn_sent; /* FN call on incoming event was sent */ |
| 85 | LIST_HEAD(, ng_ksocket_private) embryos; |
| 86 | LIST_ENTRY(ng_ksocket_private) siblings; |
| 87 | u_int32_t flags; |
| 88 | u_int32_t response_token; |
| 89 | ng_ID_t response_addr; |
| 90 | }; |
| 91 | typedef struct ng_ksocket_private *priv_p; |
| 92 | |
| 93 | /* Flags for priv_p */ |
| 94 | #define KSF_CONNECTING 0x00000001 /* Waiting for connection complete */ |
| 95 | #define KSF_ACCEPTING 0x00000002 /* Waiting for accept complete */ |
| 96 | #define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */ |
| 97 | #define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */ |
| 98 | #define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */ |
| 99 | |
| 100 | /* Netgraph node methods */ |
| 101 | static ng_constructor_t ng_ksocket_constructor; |
| 102 | static ng_rcvmsg_t ng_ksocket_rcvmsg; |
| 103 | static ng_shutdown_t ng_ksocket_shutdown; |
| 104 | static ng_newhook_t ng_ksocket_newhook; |
| 105 | static ng_rcvdata_t ng_ksocket_rcvdata; |
| 106 | static ng_connect_t ng_ksocket_connect; |
| 107 | static ng_disconnect_t ng_ksocket_disconnect; |
| 108 | |
| 109 | /* Alias structure */ |
| 110 | struct ng_ksocket_alias { |
| 111 | const char *name; |
| 112 | const int value; |
| 113 | const int family; |
| 114 | }; |
| 115 | |
| 116 | /* Protocol family aliases */ |
| 117 | static const struct ng_ksocket_alias ng_ksocket_families[] = { |
| 118 | { "local", PF_LOCAL }, |
| 119 | { "inet", PF_INET }, |
| 120 | { "inet6", PF_INET6 }, |
| 121 | { "ipx", PF_IPX }, |
| 122 | { "atm", PF_ATM }, |
| 123 | { NULL, -1 }, |
| 124 | }; |
| 125 | |
| 126 | /* Socket type aliases */ |
| 127 | static const struct ng_ksocket_alias ng_ksocket_types[] = { |
| 128 | { "stream", SOCK_STREAM }, |
| 129 | { "dgram", SOCK_DGRAM }, |
| 130 | { "raw", SOCK_RAW }, |
| 131 | { "rdm", SOCK_RDM }, |
| 132 | { "seqpacket", SOCK_SEQPACKET }, |
| 133 | { NULL, -1 }, |
| 134 | }; |
| 135 | |
| 136 | /* Protocol aliases */ |
| 137 | static const struct ng_ksocket_alias ng_ksocket_protos[] = { |
| 138 | { "ip", IPPROTO_IP, PF_INET }, |
| 139 | { "raw", IPPROTO_RAW, PF_INET }, |
| 140 | { "icmp", IPPROTO_ICMP, PF_INET }, |
| 141 | { "igmp", IPPROTO_IGMP, PF_INET }, |
| 142 | { "tcp", IPPROTO_TCP, PF_INET }, |
| 143 | { "udp", IPPROTO_UDP, PF_INET }, |
| 144 | { "gre", IPPROTO_GRE, PF_INET }, |
| 145 | { "esp", IPPROTO_ESP, PF_INET }, |
| 146 | { "ah", IPPROTO_AH, PF_INET }, |
| 147 | { "swipe", IPPROTO_SWIPE, PF_INET }, |
| 148 | { "encap", IPPROTO_ENCAP, PF_INET }, |
| 149 | { "divert", IPPROTO_DIVERT, PF_INET }, |
| 150 | { "pim", IPPROTO_PIM, PF_INET }, |
| 151 | { NULL, -1 }, |
| 152 | }; |
| 153 | |
| 154 | /* Helper functions */ |
| 155 | static int ng_ksocket_check_accept(priv_p); |
| 156 | static void ng_ksocket_finish_accept(priv_p); |
| 157 | static void ng_ksocket_incoming(struct socket *so, void *arg, int waitflag); |
| 158 | static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases, |
| 159 | const char *s, int family); |
| 160 | static void ng_ksocket_incoming2(node_p node, hook_p hook, |
| 161 | void *arg1, int arg2); |
| 162 | |
| 163 | /************************************************************************ |
| 164 | STRUCT SOCKADDR PARSE TYPE |
| 165 | ************************************************************************/ |
| 166 | |
| 167 | /* Get the length of the data portion of a generic struct sockaddr */ |
| 168 | static int |
| 169 | ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type, |
| 170 | const u_char *start, const u_char *buf) |
| 171 | { |
| 172 | const struct sockaddr *sa; |
| 173 | |
| 174 | sa = (const struct sockaddr *)(buf - SADATA_OFFSET); |
| 175 | return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET; |
| 176 | } |
| 177 | |
| 178 | /* Type for the variable length data portion of a generic struct sockaddr */ |
| 179 | static const struct ng_parse_type ng_ksocket_generic_sockdata_type = { |
| 180 | &ng_parse_bytearray_type, |
| 181 | &ng_parse_generic_sockdata_getLength |
| 182 | }; |
| 183 | |
| 184 | /* Type for a generic struct sockaddr */ |
| 185 | static const struct ng_parse_struct_field |
| 186 | ng_parse_generic_sockaddr_type_fields[] = { |
| 187 | { "len", &ng_parse_uint8_type }, |
| 188 | { "family", &ng_parse_uint8_type }, |
| 189 | { "data", &ng_ksocket_generic_sockdata_type }, |
| 190 | { NULL } |
| 191 | }; |
| 192 | static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = { |
| 193 | &ng_parse_struct_type, |
| 194 | &ng_parse_generic_sockaddr_type_fields |
| 195 | }; |
| 196 | |
| 197 | /* Convert a struct sockaddr from ASCII to binary. If its a protocol |
| 198 | family that we specially handle, do that, otherwise defer to the |
| 199 | generic parse type ng_ksocket_generic_sockaddr_type. */ |
| 200 | static int |
| 201 | ng_ksocket_sockaddr_parse(const struct ng_parse_type *type, |
| 202 | const char *s, int *off, const u_char *const start, |
| 203 | u_char *const buf, int *buflen) |
| 204 | { |
| 205 | struct sockaddr *const sa = (struct sockaddr *)buf; |
| 206 | enum ng_parse_token tok; |
| 207 | char fambuf[32]; |
| 208 | int family, len; |
| 209 | char *t; |
| 210 | |
| 211 | /* If next token is a left curly brace, use generic parse type */ |
| 212 | if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) { |
| 213 | return (*ng_ksocket_generic_sockaddr_type.supertype->parse) |
| 214 | (&ng_ksocket_generic_sockaddr_type, |
| 215 | s, off, start, buf, buflen); |
| 216 | } |
| 217 | |
| 218 | /* Get socket address family followed by a slash */ |
| 219 | while (isspace(s[*off])) |
| 220 | (*off)++; |
| 221 | if ((t = index(s + *off, '/')) == NULL) |
| 222 | return (EINVAL); |
| 223 | if ((len = t - (s + *off)) > sizeof(fambuf) - 1) |
| 224 | return (EINVAL); |
| 225 | strncpy(fambuf, s + *off, len); |
| 226 | fambuf[len] = '\0'; |
| 227 | *off += len + 1; |
| 228 | if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1) |
| 229 | return (EINVAL); |
| 230 | |
| 231 | /* Set family */ |
| 232 | if (*buflen < SADATA_OFFSET) |
| 233 | return (ERANGE); |
| 234 | sa->sa_family = family; |
| 235 | |
| 236 | /* Set family-specific data and length */ |
| 237 | switch (sa->sa_family) { |
| 238 | case PF_LOCAL: /* Get pathname */ |
| 239 | { |
| 240 | const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); |
| 241 | struct sockaddr_un *const sun = (struct sockaddr_un *)sa; |
| 242 | int toklen, pathlen; |
| 243 | char *path; |
| 244 | |
| 245 | if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL) |
| 246 | return (EINVAL); |
| 247 | pathlen = strlen(path); |
| 248 | if (pathlen > SOCK_MAXADDRLEN) { |
| 249 | kfree(path, M_NETGRAPH_KSOCKET); |
| 250 | return (E2BIG); |
| 251 | } |
| 252 | if (*buflen < pathoff + pathlen) { |
| 253 | kfree(path, M_NETGRAPH_KSOCKET); |
| 254 | return (ERANGE); |
| 255 | } |
| 256 | *off += toklen; |
| 257 | bcopy(path, sun->sun_path, pathlen); |
| 258 | sun->sun_len = pathoff + pathlen; |
| 259 | kfree(path, M_NETGRAPH_KSOCKET); |
| 260 | break; |
| 261 | } |
| 262 | |
| 263 | case PF_INET: /* Get an IP address with optional port */ |
| 264 | { |
| 265 | struct sockaddr_in *const sin = (struct sockaddr_in *)sa; |
| 266 | int i; |
| 267 | |
| 268 | /* Parse this: <ipaddress>[:port] */ |
| 269 | for (i = 0; i < 4; i++) { |
| 270 | u_long val; |
| 271 | char *eptr; |
| 272 | |
| 273 | val = strtoul(s + *off, &eptr, 10); |
| 274 | if (val > 0xff || eptr == s + *off) |
| 275 | return (EINVAL); |
| 276 | *off += (eptr - (s + *off)); |
| 277 | ((u_char *)&sin->sin_addr)[i] = (u_char)val; |
| 278 | if (i < 3) { |
| 279 | if (s[*off] != '.') |
| 280 | return (EINVAL); |
| 281 | (*off)++; |
| 282 | } else if (s[*off] == ':') { |
| 283 | (*off)++; |
| 284 | val = strtoul(s + *off, &eptr, 10); |
| 285 | if (val > 0xffff || eptr == s + *off) |
| 286 | return (EINVAL); |
| 287 | *off += (eptr - (s + *off)); |
| 288 | sin->sin_port = htons(val); |
| 289 | } else |
| 290 | sin->sin_port = 0; |
| 291 | } |
| 292 | bzero(&sin->sin_zero, sizeof(sin->sin_zero)); |
| 293 | sin->sin_len = sizeof(*sin); |
| 294 | break; |
| 295 | } |
| 296 | |
| 297 | #if 0 |
| 298 | case PF_INET6: |
| 299 | case PF_IPX: |
| 300 | #endif |
| 301 | |
| 302 | default: |
| 303 | return (EINVAL); |
| 304 | } |
| 305 | |
| 306 | /* Done */ |
| 307 | *buflen = sa->sa_len; |
| 308 | return (0); |
| 309 | } |
| 310 | |
| 311 | /* Convert a struct sockaddr from binary to ASCII */ |
| 312 | static int |
| 313 | ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type, |
| 314 | const u_char *data, int *off, char *cbuf, int cbuflen) |
| 315 | { |
| 316 | const struct sockaddr *sa = (const struct sockaddr *)(data + *off); |
| 317 | int slen = 0; |
| 318 | |
| 319 | /* Output socket address, either in special or generic format */ |
| 320 | switch (sa->sa_family) { |
| 321 | case PF_LOCAL: |
| 322 | { |
| 323 | const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); |
| 324 | const struct sockaddr_un *sun = (const struct sockaddr_un *)sa; |
| 325 | const int pathlen = sun->sun_len - pathoff; |
| 326 | char pathbuf[SOCK_MAXADDRLEN + 1]; |
| 327 | char *pathtoken; |
| 328 | |
| 329 | bcopy(sun->sun_path, pathbuf, pathlen); |
| 330 | if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL) |
| 331 | return (ENOMEM); |
| 332 | slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken); |
| 333 | kfree(pathtoken, M_NETGRAPH); |
| 334 | if (slen >= cbuflen) |
| 335 | return (ERANGE); |
| 336 | *off += sun->sun_len; |
| 337 | return (0); |
| 338 | } |
| 339 | |
| 340 | case PF_INET: |
| 341 | { |
| 342 | const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; |
| 343 | |
| 344 | slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d", |
| 345 | ((const u_char *)&sin->sin_addr)[0], |
| 346 | ((const u_char *)&sin->sin_addr)[1], |
| 347 | ((const u_char *)&sin->sin_addr)[2], |
| 348 | ((const u_char *)&sin->sin_addr)[3]); |
| 349 | if (sin->sin_port != 0) { |
| 350 | slen += snprintf(cbuf + strlen(cbuf), |
| 351 | cbuflen - strlen(cbuf), ":%d", |
| 352 | (u_int)ntohs(sin->sin_port)); |
| 353 | } |
| 354 | if (slen >= cbuflen) |
| 355 | return (ERANGE); |
| 356 | *off += sizeof(*sin); |
| 357 | return(0); |
| 358 | } |
| 359 | |
| 360 | #if 0 |
| 361 | case PF_INET6: |
| 362 | case PF_IPX: |
| 363 | #endif |
| 364 | |
| 365 | default: |
| 366 | return (*ng_ksocket_generic_sockaddr_type.supertype->unparse) |
| 367 | (&ng_ksocket_generic_sockaddr_type, |
| 368 | data, off, cbuf, cbuflen); |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /* Parse type for struct sockaddr */ |
| 373 | static const struct ng_parse_type ng_ksocket_sockaddr_type = { |
| 374 | NULL, |
| 375 | NULL, |
| 376 | NULL, |
| 377 | &ng_ksocket_sockaddr_parse, |
| 378 | &ng_ksocket_sockaddr_unparse, |
| 379 | NULL /* no such thing as a default struct sockaddr */ |
| 380 | }; |
| 381 | |
| 382 | /************************************************************************ |
| 383 | STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE |
| 384 | ************************************************************************/ |
| 385 | |
| 386 | /* Get length of the struct ng_ksocket_sockopt value field, which is the |
| 387 | just the excess of the message argument portion over the length of |
| 388 | the struct ng_ksocket_sockopt. */ |
| 389 | static int |
| 390 | ng_parse_sockoptval_getLength(const struct ng_parse_type *type, |
| 391 | const u_char *start, const u_char *buf) |
| 392 | { |
| 393 | static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value); |
| 394 | const struct ng_ksocket_sockopt *sopt; |
| 395 | const struct ng_mesg *msg; |
| 396 | |
| 397 | sopt = (const struct ng_ksocket_sockopt *)(buf - offset); |
| 398 | msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg)); |
| 399 | return msg->header.arglen - sizeof(*sopt); |
| 400 | } |
| 401 | |
| 402 | /* Parse type for the option value part of a struct ng_ksocket_sockopt |
| 403 | XXX Eventually, we should handle the different socket options specially. |
| 404 | XXX This would avoid byte order problems, eg an integer value of 1 is |
| 405 | XXX going to be "[1]" for little endian or "[3=1]" for big endian. */ |
| 406 | static const struct ng_parse_type ng_ksocket_sockoptval_type = { |
| 407 | &ng_parse_bytearray_type, |
| 408 | &ng_parse_sockoptval_getLength |
| 409 | }; |
| 410 | |
| 411 | /* Parse type for struct ng_ksocket_sockopt */ |
| 412 | static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[] |
| 413 | = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type); |
| 414 | static const struct ng_parse_type ng_ksocket_sockopt_type = { |
| 415 | &ng_parse_struct_type, |
| 416 | &ng_ksocket_sockopt_type_fields |
| 417 | }; |
| 418 | |
| 419 | /* Parse type for struct ng_ksocket_accept */ |
| 420 | static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[] |
| 421 | = NGM_KSOCKET_ACCEPT_INFO; |
| 422 | static const struct ng_parse_type ng_ksocket_accept_type = { |
| 423 | &ng_parse_struct_type, |
| 424 | &ng_ksocket_accept_type_fields |
| 425 | }; |
| 426 | |
| 427 | /* List of commands and how to convert arguments to/from ASCII */ |
| 428 | static const struct ng_cmdlist ng_ksocket_cmds[] = { |
| 429 | { |
| 430 | NGM_KSOCKET_COOKIE, |
| 431 | NGM_KSOCKET_BIND, |
| 432 | "bind", |
| 433 | &ng_ksocket_sockaddr_type, |
| 434 | NULL |
| 435 | }, |
| 436 | { |
| 437 | NGM_KSOCKET_COOKIE, |
| 438 | NGM_KSOCKET_LISTEN, |
| 439 | "listen", |
| 440 | &ng_parse_int32_type, |
| 441 | NULL |
| 442 | }, |
| 443 | { |
| 444 | NGM_KSOCKET_COOKIE, |
| 445 | NGM_KSOCKET_ACCEPT, |
| 446 | "accept", |
| 447 | NULL, |
| 448 | &ng_ksocket_accept_type |
| 449 | }, |
| 450 | { |
| 451 | NGM_KSOCKET_COOKIE, |
| 452 | NGM_KSOCKET_CONNECT, |
| 453 | "connect", |
| 454 | &ng_ksocket_sockaddr_type, |
| 455 | &ng_parse_int32_type |
| 456 | }, |
| 457 | { |
| 458 | NGM_KSOCKET_COOKIE, |
| 459 | NGM_KSOCKET_GETNAME, |
| 460 | "getname", |
| 461 | NULL, |
| 462 | &ng_ksocket_sockaddr_type |
| 463 | }, |
| 464 | { |
| 465 | NGM_KSOCKET_COOKIE, |
| 466 | NGM_KSOCKET_GETPEERNAME, |
| 467 | "getpeername", |
| 468 | NULL, |
| 469 | &ng_ksocket_sockaddr_type |
| 470 | }, |
| 471 | { |
| 472 | NGM_KSOCKET_COOKIE, |
| 473 | NGM_KSOCKET_SETOPT, |
| 474 | "setopt", |
| 475 | &ng_ksocket_sockopt_type, |
| 476 | NULL |
| 477 | }, |
| 478 | { |
| 479 | NGM_KSOCKET_COOKIE, |
| 480 | NGM_KSOCKET_GETOPT, |
| 481 | "getopt", |
| 482 | &ng_ksocket_sockopt_type, |
| 483 | &ng_ksocket_sockopt_type |
| 484 | }, |
| 485 | { 0 } |
| 486 | }; |
| 487 | |
| 488 | /* Node type descriptor */ |
| 489 | static struct ng_type ng_ksocket_typestruct = { |
| 490 | .version = NG_ABI_VERSION, |
| 491 | .name = NG_KSOCKET_NODE_TYPE, |
| 492 | .constructor = ng_ksocket_constructor, |
| 493 | .rcvmsg = ng_ksocket_rcvmsg, |
| 494 | .shutdown = ng_ksocket_shutdown, |
| 495 | .newhook = ng_ksocket_newhook, |
| 496 | .connect = ng_ksocket_connect, |
| 497 | .rcvdata = ng_ksocket_rcvdata, |
| 498 | .disconnect = ng_ksocket_disconnect, |
| 499 | .cmdlist = ng_ksocket_cmds, |
| 500 | }; |
| 501 | NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct); |
| 502 | |
| 503 | #define ERROUT(x) do { error = (x); goto done; } while (0) |
| 504 | |
| 505 | /************************************************************************ |
| 506 | NETGRAPH NODE STUFF |
| 507 | ************************************************************************/ |
| 508 | |
| 509 | /* |
| 510 | * Node type constructor |
| 511 | * The NODE part is assumed to be all set up. |
| 512 | * There is already a reference to the node for us. |
| 513 | */ |
| 514 | static int |
| 515 | ng_ksocket_constructor(node_p node) |
| 516 | { |
| 517 | priv_p priv; |
| 518 | |
| 519 | /* Allocate private structure */ |
| 520 | priv = kmalloc(sizeof(*priv), M_NETGRAPH, |
| 521 | M_WAITOK | M_NULLOK | M_ZERO); |
| 522 | if (priv == NULL) |
| 523 | return (ENOMEM); |
| 524 | |
| 525 | LIST_INIT(&priv->embryos); |
| 526 | /* cross link them */ |
| 527 | priv->node = node; |
| 528 | NG_NODE_SET_PRIVATE(node, priv); |
| 529 | |
| 530 | /* Done */ |
| 531 | return (0); |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Give our OK for a hook to be added. The hook name is of the |
| 536 | * form "<family>/<type>/<proto>" where the three components may |
| 537 | * be decimal numbers or else aliases from the above lists. |
| 538 | * |
| 539 | * Connecting a hook amounts to opening the socket. Disconnecting |
| 540 | * the hook closes the socket and destroys the node as well. |
| 541 | */ |
| 542 | static int |
| 543 | ng_ksocket_newhook(node_p node, hook_p hook, const char *name0) |
| 544 | { |
| 545 | struct thread *td = curthread; /* XXX broken */ |
| 546 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 547 | char *s1, *s2, name[NG_HOOKSIZ]; |
| 548 | int family, type, protocol, error; |
| 549 | |
| 550 | /* Check if we're already connected */ |
| 551 | if (priv->hook != NULL) |
| 552 | return (EISCONN); |
| 553 | |
| 554 | if (priv->flags & KSF_CLONED) { |
| 555 | if (priv->flags & KSF_EMBRYONIC) { |
| 556 | /* Remove ourselves from our parent's embryo list */ |
| 557 | LIST_REMOVE(priv, siblings); |
| 558 | priv->flags &= ~KSF_EMBRYONIC; |
| 559 | } |
| 560 | } else { |
| 561 | /* Extract family, type, and protocol from hook name */ |
| 562 | snprintf(name, sizeof(name), "%s", name0); |
| 563 | s1 = name; |
| 564 | if ((s2 = index(s1, '/')) == NULL) |
| 565 | return (EINVAL); |
| 566 | *s2++ = '\0'; |
| 567 | family = ng_ksocket_parse(ng_ksocket_families, s1, 0); |
| 568 | if (family == -1) |
| 569 | return (EINVAL); |
| 570 | s1 = s2; |
| 571 | if ((s2 = index(s1, '/')) == NULL) |
| 572 | return (EINVAL); |
| 573 | *s2++ = '\0'; |
| 574 | type = ng_ksocket_parse(ng_ksocket_types, s1, 0); |
| 575 | if (type == -1) |
| 576 | return (EINVAL); |
| 577 | s1 = s2; |
| 578 | protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family); |
| 579 | if (protocol == -1) |
| 580 | return (EINVAL); |
| 581 | |
| 582 | /* Create the socket */ |
| 583 | error = socreate(family, &priv->so, type, protocol, |
| 584 | td->td_ucred, td); |
| 585 | if (error != 0) |
| 586 | return (error); |
| 587 | |
| 588 | /* XXX call soreserve() ? */ |
| 589 | |
| 590 | } |
| 591 | |
| 592 | /* OK */ |
| 593 | priv->hook = hook; |
| 594 | |
| 595 | /* |
| 596 | * In case of misconfigured routing a packet may reenter |
| 597 | * ksocket node recursively. Decouple stack to avoid possible |
| 598 | * panics about sleeping with locks held. |
| 599 | */ |
| 600 | NG_HOOK_FORCE_QUEUE(hook); |
| 601 | |
| 602 | return(0); |
| 603 | } |
| 604 | |
| 605 | static int |
| 606 | ng_ksocket_connect(hook_p hook) |
| 607 | { |
| 608 | node_p node = NG_HOOK_NODE(hook); |
| 609 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 610 | struct socket *const so = priv->so; |
| 611 | |
| 612 | /* Add our hook for incoming data and other events */ |
| 613 | priv->so->so_upcallarg = (caddr_t)node; |
| 614 | priv->so->so_upcall = ng_ksocket_incoming; |
| 615 | SOCKBUF_LOCK(&priv->so->so_rcv); |
| 616 | priv->so->so_rcv.sb_flags |= SB_UPCALL; |
| 617 | SOCKBUF_UNLOCK(&priv->so->so_rcv); |
| 618 | SOCKBUF_LOCK(&priv->so->so_snd); |
| 619 | priv->so->so_snd.sb_flags |= SB_UPCALL; |
| 620 | SOCKBUF_UNLOCK(&priv->so->so_snd); |
| 621 | SOCK_LOCK(priv->so); |
| 622 | sosetstate(priv->so, SS_NBIO); |
| 623 | SOCK_UNLOCK(priv->so); |
| 624 | /* |
| 625 | * --Original comment-- |
| 626 | * On a cloned socket we may have already received one or more |
| 627 | * upcalls which we couldn't handle without a hook. Handle |
| 628 | * those now. |
| 629 | * We cannot call the upcall function directly |
| 630 | * from here, because until this function has returned our |
| 631 | * hook isn't connected. |
| 632 | * |
| 633 | * ---meta comment for -current --- |
| 634 | * XXX This is dubius. |
| 635 | * Upcalls between the time that the hook was |
| 636 | * first created and now (on another processesor) will |
| 637 | * be earlier on the queue than the request to finalise the hook. |
| 638 | * By the time the hook is finalised, |
| 639 | * The queued upcalls will have happenned and the code |
| 640 | * will have discarded them because of a lack of a hook. |
| 641 | * (socket not open). |
| 642 | * |
| 643 | * This is a bad byproduct of the complicated way in which hooks |
| 644 | * are now created (3 daisy chained async events). |
| 645 | * |
| 646 | * Since we are a netgraph operation |
| 647 | * We know that we hold a lock on this node. This forces the |
| 648 | * request we make below to be queued rather than implemented |
| 649 | * immediatly which will cause the upcall function to be called a bit |
| 650 | * later. |
| 651 | * However, as we will run any waiting queued operations immediatly |
| 652 | * after doing this one, if we have not finalised the other end |
| 653 | * of the hook, those queued operations will fail. |
| 654 | */ |
| 655 | if (priv->flags & KSF_CLONED) { |
| 656 | ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_WAITOK | M_NULLOK); |
| 657 | } |
| 658 | |
| 659 | return (0); |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Receive a control message |
| 664 | */ |
| 665 | static int |
| 666 | ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook) |
| 667 | { |
| 668 | struct thread *td = curthread; /* XXX broken */ |
| 669 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 670 | struct socket *const so = priv->so; |
| 671 | struct ng_mesg *resp = NULL; |
| 672 | int error = 0; |
| 673 | struct ng_mesg *msg; |
| 674 | ng_ID_t raddr; |
| 675 | |
| 676 | NGI_GET_MSG(item, msg); |
| 677 | switch (msg->header.typecookie) { |
| 678 | case NGM_KSOCKET_COOKIE: |
| 679 | switch (msg->header.cmd) { |
| 680 | case NGM_KSOCKET_BIND: |
| 681 | { |
| 682 | struct sockaddr *const sa |
| 683 | = (struct sockaddr *)msg->data; |
| 684 | |
| 685 | /* Sanity check */ |
| 686 | if (msg->header.arglen < SADATA_OFFSET |
| 687 | || msg->header.arglen < sa->sa_len) |
| 688 | ERROUT(EINVAL); |
| 689 | if (so == NULL) |
| 690 | ERROUT(ENXIO); |
| 691 | |
| 692 | /* Bind */ |
| 693 | error = sobind(so, sa, td); |
| 694 | break; |
| 695 | } |
| 696 | case NGM_KSOCKET_LISTEN: |
| 697 | { |
| 698 | /* Sanity check */ |
| 699 | if (msg->header.arglen != sizeof(int32_t)) |
| 700 | ERROUT(EINVAL); |
| 701 | if (so == NULL) |
| 702 | ERROUT(ENXIO); |
| 703 | |
| 704 | /* Listen */ |
| 705 | error = solisten(so, *((int32_t *)msg->data), td); |
| 706 | break; |
| 707 | } |
| 708 | |
| 709 | case NGM_KSOCKET_ACCEPT: |
| 710 | { |
| 711 | /* Sanity check */ |
| 712 | if (msg->header.arglen != 0) |
| 713 | ERROUT(EINVAL); |
| 714 | if (so == NULL) |
| 715 | ERROUT(ENXIO); |
| 716 | |
| 717 | /* Make sure the socket is capable of accepting */ |
| 718 | if (!(so->so_options & SO_ACCEPTCONN)) |
| 719 | ERROUT(EINVAL); |
| 720 | if (priv->flags & KSF_ACCEPTING) |
| 721 | ERROUT(EALREADY); |
| 722 | |
| 723 | error = ng_ksocket_check_accept(priv); |
| 724 | if (error != 0 && error != EWOULDBLOCK) |
| 725 | ERROUT(error); |
| 726 | |
| 727 | /* |
| 728 | * If a connection is already complete, take it. |
| 729 | * Otherwise let the upcall function deal with |
| 730 | * the connection when it comes in. |
| 731 | */ |
| 732 | priv->response_token = msg->header.token; |
| 733 | raddr = priv->response_addr = NGI_RETADDR(item); |
| 734 | if (error == 0) { |
| 735 | ng_ksocket_finish_accept(priv); |
| 736 | } else |
| 737 | priv->flags |= KSF_ACCEPTING; |
| 738 | break; |
| 739 | } |
| 740 | |
| 741 | case NGM_KSOCKET_CONNECT: |
| 742 | { |
| 743 | struct sockaddr *const sa |
| 744 | = (struct sockaddr *)msg->data; |
| 745 | |
| 746 | /* Sanity check */ |
| 747 | if (msg->header.arglen < SADATA_OFFSET |
| 748 | || msg->header.arglen < sa->sa_len) |
| 749 | ERROUT(EINVAL); |
| 750 | if (so == NULL) |
| 751 | ERROUT(ENXIO); |
| 752 | |
| 753 | /* Do connect */ |
| 754 | if ((so->so_state & SS_ISCONNECTING) != 0) |
| 755 | ERROUT(EALREADY); |
| 756 | if ((error = soconnect(so, sa, td)) != 0) { |
| 757 | soclrstate(so, SS_ISCONNECTING); |
| 758 | ERROUT(error); |
| 759 | } |
| 760 | if ((so->so_state & SS_ISCONNECTING) != 0) { |
| 761 | /* We will notify the sender when we connect */ |
| 762 | priv->response_token = msg->header.token; |
| 763 | raddr = priv->response_addr = NGI_RETADDR(item); |
| 764 | priv->flags |= KSF_CONNECTING; |
| 765 | ERROUT(EINPROGRESS); |
| 766 | } |
| 767 | break; |
| 768 | } |
| 769 | |
| 770 | case NGM_KSOCKET_GETNAME: |
| 771 | case NGM_KSOCKET_GETPEERNAME: |
| 772 | { |
| 773 | int (*func)(struct socket *so, struct sockaddr **nam); |
| 774 | struct sockaddr *sa = NULL; |
| 775 | int len; |
| 776 | |
| 777 | /* Sanity check */ |
| 778 | if (msg->header.arglen != 0) |
| 779 | ERROUT(EINVAL); |
| 780 | if (so == NULL) |
| 781 | ERROUT(ENXIO); |
| 782 | |
| 783 | /* Get function */ |
| 784 | if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) { |
| 785 | if ((so->so_state |
| 786 | & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) |
| 787 | ERROUT(ENOTCONN); |
| 788 | func = so->so_proto->pr_usrreqs->pru_peeraddr; |
| 789 | } else |
| 790 | func = so->so_proto->pr_usrreqs->pru_sockaddr; |
| 791 | |
| 792 | /* Get local or peer address */ |
| 793 | if ((error = (*func)(so, &sa)) != 0) |
| 794 | goto bail; |
| 795 | len = (sa == NULL) ? 0 : sa->sa_len; |
| 796 | |
| 797 | /* Send it back in a response */ |
| 798 | NG_MKRESPONSE(resp, msg, len, M_WAITOK | M_NULLOK); |
| 799 | if (resp == NULL) { |
| 800 | error = ENOMEM; |
| 801 | goto bail; |
| 802 | } |
| 803 | bcopy(sa, resp->data, len); |
| 804 | |
| 805 | bail: |
| 806 | /* Cleanup */ |
| 807 | if (sa != NULL) |
| 808 | kfree(sa, M_SONAME); |
| 809 | break; |
| 810 | } |
| 811 | |
| 812 | case NGM_KSOCKET_GETOPT: |
| 813 | { |
| 814 | struct ng_ksocket_sockopt *ksopt = |
| 815 | (struct ng_ksocket_sockopt *)msg->data; |
| 816 | struct sockopt sopt; |
| 817 | |
| 818 | /* Sanity check */ |
| 819 | if (msg->header.arglen != sizeof(*ksopt)) |
| 820 | ERROUT(EINVAL); |
| 821 | if (so == NULL) |
| 822 | ERROUT(ENXIO); |
| 823 | |
| 824 | /* Get response with room for option value */ |
| 825 | NG_MKRESPONSE(resp, msg, sizeof(*ksopt) |
| 826 | + NG_KSOCKET_MAX_OPTLEN, M_WAITOK | M_NULLOK); |
| 827 | if (resp == NULL) |
| 828 | ERROUT(ENOMEM); |
| 829 | |
| 830 | /* Get socket option, and put value in the response */ |
| 831 | sopt.sopt_dir = SOPT_GET; |
| 832 | sopt.sopt_level = ksopt->level; |
| 833 | sopt.sopt_name = ksopt->name; |
| 834 | sopt.sopt_td = NULL; |
| 835 | sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN; |
| 836 | ksopt = (struct ng_ksocket_sockopt *)resp->data; |
| 837 | sopt.sopt_val = ksopt->value; |
| 838 | if ((error = sogetopt(so, &sopt)) != 0) { |
| 839 | NG_FREE_MSG(resp); |
| 840 | break; |
| 841 | } |
| 842 | |
| 843 | /* Set actual value length */ |
| 844 | resp->header.arglen = sizeof(*ksopt) |
| 845 | + sopt.sopt_valsize; |
| 846 | break; |
| 847 | } |
| 848 | |
| 849 | case NGM_KSOCKET_SETOPT: |
| 850 | { |
| 851 | struct ng_ksocket_sockopt *const ksopt = |
| 852 | (struct ng_ksocket_sockopt *)msg->data; |
| 853 | const int valsize = msg->header.arglen - sizeof(*ksopt); |
| 854 | struct sockopt sopt; |
| 855 | |
| 856 | /* Sanity check */ |
| 857 | if (valsize < 0) |
| 858 | ERROUT(EINVAL); |
| 859 | if (so == NULL) |
| 860 | ERROUT(ENXIO); |
| 861 | |
| 862 | /* Set socket option */ |
| 863 | sopt.sopt_dir = SOPT_SET; |
| 864 | sopt.sopt_level = ksopt->level; |
| 865 | sopt.sopt_name = ksopt->name; |
| 866 | sopt.sopt_val = ksopt->value; |
| 867 | sopt.sopt_valsize = valsize; |
| 868 | sopt.sopt_td = NULL; |
| 869 | error = sosetopt(so, &sopt); |
| 870 | break; |
| 871 | } |
| 872 | |
| 873 | default: |
| 874 | error = EINVAL; |
| 875 | break; |
| 876 | } |
| 877 | break; |
| 878 | default: |
| 879 | error = EINVAL; |
| 880 | break; |
| 881 | } |
| 882 | done: |
| 883 | NG_RESPOND_MSG(error, node, item, resp); |
| 884 | NG_FREE_MSG(msg); |
| 885 | return (error); |
| 886 | } |
| 887 | |
| 888 | /* |
| 889 | * Receive incoming data on our hook. Send it out the socket. |
| 890 | */ |
| 891 | static int |
| 892 | ng_ksocket_rcvdata(hook_p hook, item_p item) |
| 893 | { |
| 894 | struct thread *td = curthread; /* XXX broken */ |
| 895 | const node_p node = NG_HOOK_NODE(hook); |
| 896 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 897 | struct socket *const so = priv->so; |
| 898 | struct sockaddr *sa = NULL; |
| 899 | int error; |
| 900 | struct mbuf *m; |
| 901 | struct sa_tag *stag; |
| 902 | |
| 903 | /* Extract data */ |
| 904 | NGI_GET_M(item, m); |
| 905 | NG_FREE_ITEM(item); |
| 906 | |
| 907 | /* |
| 908 | * Look if socket address is stored in packet tags. |
| 909 | * If sockaddr is ours, or provided by a third party (zero id), |
| 910 | * then we accept it. |
| 911 | */ |
| 912 | if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE, |
| 913 | NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) && |
| 914 | (stag->id == NG_NODE_ID(node) || stag->id == 0)) |
| 915 | sa = &stag->sa; |
| 916 | |
| 917 | /* Reset specific mbuf flags to prevent addressing problems. */ |
| 918 | m->m_flags &= ~(M_BCAST|M_MCAST); |
| 919 | |
| 920 | /* Send packet */ |
| 921 | error = sosend(so, sa, 0, m, 0, 0, td); |
| 922 | |
| 923 | return (error); |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * Destroy node |
| 928 | */ |
| 929 | static int |
| 930 | ng_ksocket_shutdown(node_p node) |
| 931 | { |
| 932 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 933 | priv_p embryo; |
| 934 | |
| 935 | /* Close our socket (if any) */ |
| 936 | if (priv->so != NULL) { |
| 937 | SOCKBUF_LOCK(&priv->so->so_rcv); |
| 938 | priv->so->so_rcv.sb_flags &= ~SB_UPCALL; |
| 939 | SOCKBUF_UNLOCK(&priv->so->so_rcv); |
| 940 | SOCKBUF_LOCK(&priv->so->so_snd); |
| 941 | priv->so->so_snd.sb_flags &= ~SB_UPCALL; |
| 942 | SOCKBUF_UNLOCK(&priv->so->so_snd); |
| 943 | priv->so->so_upcall = NULL; |
| 944 | soclose(priv->so); |
| 945 | priv->so = NULL; |
| 946 | } |
| 947 | |
| 948 | /* If we are an embryo, take ourselves out of the parent's list */ |
| 949 | if (priv->flags & KSF_EMBRYONIC) { |
| 950 | LIST_REMOVE(priv, siblings); |
| 951 | priv->flags &= ~KSF_EMBRYONIC; |
| 952 | } |
| 953 | |
| 954 | /* Remove any embryonic children we have */ |
| 955 | while (!LIST_EMPTY(&priv->embryos)) { |
| 956 | embryo = LIST_FIRST(&priv->embryos); |
| 957 | ng_rmnode_self(embryo->node); |
| 958 | } |
| 959 | |
| 960 | /* Take down netgraph node */ |
| 961 | bzero(priv, sizeof(*priv)); |
| 962 | kfree(priv, M_NETGRAPH); |
| 963 | NG_NODE_SET_PRIVATE(node, NULL); |
| 964 | NG_NODE_UNREF(node); /* let the node escape */ |
| 965 | return (0); |
| 966 | } |
| 967 | |
| 968 | /* |
| 969 | * Hook disconnection |
| 970 | */ |
| 971 | static int |
| 972 | ng_ksocket_disconnect(hook_p hook) |
| 973 | { |
| 974 | KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0, |
| 975 | ("%s: numhooks=%d?", __func__, |
| 976 | NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)))); |
| 977 | if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) |
| 978 | ng_rmnode_self(NG_HOOK_NODE(hook)); |
| 979 | return (0); |
| 980 | } |
| 981 | |
| 982 | /************************************************************************ |
| 983 | HELPER STUFF |
| 984 | ************************************************************************/ |
| 985 | /* |
| 986 | * You should not "just call" a netgraph node function from an external |
| 987 | * asynchronous event. This is because in doing so you are ignoring the |
| 988 | * locking on the netgraph nodes. Instead call your function via ng_send_fn(). |
| 989 | * This will call the function you chose, but will first do all the |
| 990 | * locking rigmarole. Your function MAY only be called at some distant future |
| 991 | * time (several millisecs away) so don't give it any arguments |
| 992 | * that may be revoked soon (e.g. on your stack). |
| 993 | * |
| 994 | * To decouple stack, we use queue version of ng_send_fn(). |
| 995 | */ |
| 996 | |
| 997 | static void |
| 998 | ng_ksocket_incoming(struct socket *so, void *arg, int waitflag) |
| 999 | { |
| 1000 | const node_p node = arg; |
| 1001 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 1002 | int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE; |
| 1003 | |
| 1004 | /* |
| 1005 | * Even if node is not locked, as soon as we are called, we assume |
| 1006 | * it exist and it's private area is valid. With some care we can |
| 1007 | * access it. Mark node that incoming event for it was sent to |
| 1008 | * avoid unneded queue trashing. |
| 1009 | */ |
| 1010 | if (atomic_cmpset_int(&priv->fn_sent, 0, 1) && |
| 1011 | ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) { |
| 1012 | atomic_store_rel_int(&priv->fn_sent, 0); |
| 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | |
| 1017 | /* |
| 1018 | * When incoming data is appended to the socket, we get notified here. |
| 1019 | * This is also called whenever a significant event occurs for the socket. |
| 1020 | * Our original caller may have queued this even some time ago and |
| 1021 | * we cannot trust that he even still exists. The node however is being |
| 1022 | * held with a reference by the queueing code and guarantied to be valid. |
| 1023 | */ |
| 1024 | static void |
| 1025 | ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2) |
| 1026 | { |
| 1027 | struct socket *so = arg1; |
| 1028 | const priv_p priv = NG_NODE_PRIVATE(node); |
| 1029 | struct mbuf *m; |
| 1030 | struct ng_mesg *response; |
| 1031 | struct uio auio; |
| 1032 | int s, flags, error; |
| 1033 | |
| 1034 | s = splnet(); |
| 1035 | |
| 1036 | /* so = priv->so; *//* XXX could have derived this like so */ |
| 1037 | KASSERT(so == priv->so, ("%s: wrong socket", __func__)); |
| 1038 | |
| 1039 | /* Allow next incoming event to be queued. */ |
| 1040 | atomic_store_rel_int(&priv->fn_sent, 0); |
| 1041 | |
| 1042 | /* Check whether a pending connect operation has completed */ |
| 1043 | if (priv->flags & KSF_CONNECTING) { |
| 1044 | if ((error = so->so_error) != 0) { |
| 1045 | so->so_error = 0; |
| 1046 | soclrstate(so, SS_ISCONNECTING); |
| 1047 | } |
| 1048 | if (!(so->so_state & SS_ISCONNECTING)) { |
| 1049 | NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE, |
| 1050 | NGM_KSOCKET_CONNECT, sizeof(int32_t), M_WAITOK | M_NULLOK); |
| 1051 | if (response != NULL) { |
| 1052 | response->header.flags |= NGF_RESP; |
| 1053 | response->header.token = priv->response_token; |
| 1054 | *(int32_t *)response->data = error; |
| 1055 | /* |
| 1056 | * send an async "response" message |
| 1057 | * to the node that set us up |
| 1058 | * (if it still exists) |
| 1059 | */ |
| 1060 | NG_SEND_MSG_ID(error, node, |
| 1061 | response, priv->response_addr, 0); |
| 1062 | } |
| 1063 | priv->flags &= ~KSF_CONNECTING; |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | /* Check whether a pending accept operation has completed */ |
| 1068 | if (priv->flags & KSF_ACCEPTING) { |
| 1069 | error = ng_ksocket_check_accept(priv); |
| 1070 | if (error != EWOULDBLOCK) |
| 1071 | priv->flags &= ~KSF_ACCEPTING; |
| 1072 | if (error == 0) |
| 1073 | ng_ksocket_finish_accept(priv); |
| 1074 | } |
| 1075 | |
| 1076 | /* |
| 1077 | * If we don't have a hook, we must handle data events later. When |
| 1078 | * the hook gets created and is connected, this upcall function |
| 1079 | * will be called again. |
| 1080 | */ |
| 1081 | if (priv->hook == NULL) { |
| 1082 | splx(s); |
| 1083 | return; |
| 1084 | } |
| 1085 | |
| 1086 | /* Read and forward available mbuf's */ |
| 1087 | auio.uio_td = NULL; |
| 1088 | auio.uio_resid = 1000000000; |
| 1089 | flags = MSG_DONTWAIT; |
| 1090 | while (1) { |
| 1091 | struct sockaddr *sa = NULL; |
| 1092 | struct mbuf *n; |
| 1093 | |
| 1094 | /* Try to get next packet from socket */ |
| 1095 | if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ? |
| 1096 | NULL : &sa, &auio, &m, NULL, &flags)) != 0) |
| 1097 | break; |
| 1098 | |
| 1099 | /* See if we got anything */ |
| 1100 | if (m == NULL) { |
| 1101 | if (sa != NULL) |
| 1102 | kfree(sa, M_SONAME); |
| 1103 | break; |
| 1104 | } |
| 1105 | |
| 1106 | /* |
| 1107 | * Don't trust the various socket layers to get the |
| 1108 | * packet header and length correct (e.g. kern/15175). |
| 1109 | * |
| 1110 | * Also, do not trust that soreceive() will clear m_nextpkt |
| 1111 | * for us (e.g. kern/84952, kern/82413). |
| 1112 | */ |
| 1113 | m->m_pkthdr.csum_flags = 0; |
| 1114 | for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) { |
| 1115 | m->m_pkthdr.len += n->m_len; |
| 1116 | n->m_nextpkt = NULL; |
| 1117 | } |
| 1118 | |
| 1119 | /* Put peer's socket address (if any) into a tag */ |
| 1120 | if (sa != NULL) { |
| 1121 | struct sa_tag *stag; |
| 1122 | |
| 1123 | stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE, |
| 1124 | NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) + |
| 1125 | sa->sa_len, MB_DONTWAIT); |
| 1126 | if (stag == NULL) { |
| 1127 | kfree(sa, M_SONAME); |
| 1128 | goto sendit; |
| 1129 | } |
| 1130 | bcopy(sa, &stag->sa, sa->sa_len); |
| 1131 | kfree(sa, M_SONAME); |
| 1132 | stag->id = NG_NODE_ID(node); |
| 1133 | m_tag_prepend(m, &stag->tag); |
| 1134 | } |
| 1135 | |
| 1136 | sendit: /* Forward data with optional peer sockaddr as packet tag */ |
| 1137 | NG_SEND_DATA_ONLY(error, priv->hook, m); |
| 1138 | } |
| 1139 | |
| 1140 | /* |
| 1141 | * If the peer has closed the connection, forward a 0-length mbuf |
| 1142 | * to indicate end-of-file. |
| 1143 | */ |
| 1144 | if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) { |
| 1145 | MGETHDR(m, MB_DONTWAIT, MT_DATA); |
| 1146 | if (m != NULL) { |
| 1147 | m->m_len = m->m_pkthdr.len = 0; |
| 1148 | NG_SEND_DATA_ONLY(error, priv->hook, m); |
| 1149 | } |
| 1150 | priv->flags |= KSF_EOFSEEN; |
| 1151 | } |
| 1152 | splx(s); |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * Check for a completed incoming connection and return 0 if one is found. |
| 1157 | * Otherwise return the appropriate error code. |
| 1158 | */ |
| 1159 | static int |
| 1160 | ng_ksocket_check_accept(priv_p priv) |
| 1161 | { |
| 1162 | struct socket *const head = priv->so; |
| 1163 | int error; |
| 1164 | |
| 1165 | if ((error = head->so_error) != 0) { |
| 1166 | head->so_error = 0; |
| 1167 | return error; |
| 1168 | } |
| 1169 | /* Unlocked read. */ |
| 1170 | if (TAILQ_EMPTY(&head->so_comp)) { |
| 1171 | if (head->so_rcv.sb_state & SBS_CANTRCVMORE) |
| 1172 | return ECONNABORTED; |
| 1173 | return EWOULDBLOCK; |
| 1174 | } |
| 1175 | return 0; |
| 1176 | } |
| 1177 | |
| 1178 | /* |
| 1179 | * Handle the first completed incoming connection, assumed to be already |
| 1180 | * on the socket's so_comp queue. |
| 1181 | */ |
| 1182 | static void |
| 1183 | ng_ksocket_finish_accept(priv_p priv) |
| 1184 | { |
| 1185 | struct socket *const head = priv->so; |
| 1186 | struct socket *so; |
| 1187 | struct sockaddr *sa = NULL; |
| 1188 | struct ng_mesg *resp; |
| 1189 | struct ng_ksocket_accept *resp_data; |
| 1190 | node_p node; |
| 1191 | priv_p priv2; |
| 1192 | int len; |
| 1193 | int error; |
| 1194 | |
| 1195 | ACCEPT_LOCK(); |
| 1196 | so = TAILQ_FIRST(&head->so_comp); |
| 1197 | if (so == NULL) { /* Should never happen */ |
| 1198 | ACCEPT_UNLOCK(); |
| 1199 | return; |
| 1200 | } |
| 1201 | TAILQ_REMOVE(&head->so_comp, so, so_list); |
| 1202 | head->so_qlen--; |
| 1203 | so->so_qstate &= ~SQ_COMP; |
| 1204 | so->so_head = NULL; |
| 1205 | SOCK_LOCK(so); |
| 1206 | soref(so); |
| 1207 | sosetstate(so, SS_NBIO); |
| 1208 | SOCK_UNLOCK(so); |
| 1209 | ACCEPT_UNLOCK(); |
| 1210 | |
| 1211 | /* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */ |
| 1212 | |
| 1213 | soaccept(so, &sa); |
| 1214 | |
| 1215 | len = OFFSETOF(struct ng_ksocket_accept, addr); |
| 1216 | if (sa != NULL) |
| 1217 | len += sa->sa_len; |
| 1218 | |
| 1219 | NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len, |
| 1220 | M_WAITOK | M_NULLOK); |
| 1221 | if (resp == NULL) { |
| 1222 | soclose(so); |
| 1223 | goto out; |
| 1224 | } |
| 1225 | resp->header.flags |= NGF_RESP; |
| 1226 | resp->header.token = priv->response_token; |
| 1227 | |
| 1228 | /* Clone a ksocket node to wrap the new socket */ |
| 1229 | error = ng_make_node_common(&ng_ksocket_typestruct, &node); |
| 1230 | if (error) { |
| 1231 | kfree(resp, M_NETGRAPH); |
| 1232 | soclose(so); |
| 1233 | goto out; |
| 1234 | } |
| 1235 | |
| 1236 | if (ng_ksocket_constructor(node) != 0) { |
| 1237 | NG_NODE_UNREF(node); |
| 1238 | kfree(resp, M_NETGRAPH); |
| 1239 | soclose(so); |
| 1240 | goto out; |
| 1241 | } |
| 1242 | |
| 1243 | priv2 = NG_NODE_PRIVATE(node); |
| 1244 | priv2->so = so; |
| 1245 | priv2->flags |= KSF_CLONED | KSF_EMBRYONIC; |
| 1246 | |
| 1247 | /* |
| 1248 | * Insert the cloned node into a list of embryonic children |
| 1249 | * on the parent node. When a hook is created on the cloned |
| 1250 | * node it will be removed from this list. When the parent |
| 1251 | * is destroyed it will destroy any embryonic children it has. |
| 1252 | */ |
| 1253 | LIST_INSERT_HEAD(&priv->embryos, priv2, siblings); |
| 1254 | |
| 1255 | so->so_upcallarg = (caddr_t)node; |
| 1256 | so->so_upcall = ng_ksocket_incoming; |
| 1257 | SOCKBUF_LOCK(&so->so_rcv); |
| 1258 | so->so_rcv.sb_flags |= SB_UPCALL; |
| 1259 | SOCKBUF_UNLOCK(&so->so_rcv); |
| 1260 | SOCKBUF_LOCK(&so->so_snd); |
| 1261 | so->so_snd.sb_flags |= SB_UPCALL; |
| 1262 | SOCKBUF_UNLOCK(&so->so_snd); |
| 1263 | |
| 1264 | /* Fill in the response data and send it or return it to the caller */ |
| 1265 | resp_data = (struct ng_ksocket_accept *)resp->data; |
| 1266 | resp_data->nodeid = NG_NODE_ID(node); |
| 1267 | if (sa != NULL) |
| 1268 | bcopy(sa, &resp_data->addr, sa->sa_len); |
| 1269 | NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0); |
| 1270 | |
| 1271 | out: |
| 1272 | if (sa != NULL) |
| 1273 | kfree(sa, M_SONAME); |
| 1274 | } |
| 1275 | |
| 1276 | /* |
| 1277 | * Parse out either an integer value or an alias. |
| 1278 | */ |
| 1279 | static int |
| 1280 | ng_ksocket_parse(const struct ng_ksocket_alias *aliases, |
| 1281 | const char *s, int family) |
| 1282 | { |
| 1283 | int k, val; |
| 1284 | char *eptr; |
| 1285 | |
| 1286 | /* Try aliases */ |
| 1287 | for (k = 0; aliases[k].name != NULL; k++) { |
| 1288 | if (strcmp(s, aliases[k].name) == 0 |
| 1289 | && aliases[k].family == family) |
| 1290 | return aliases[k].value; |
| 1291 | } |
| 1292 | |
| 1293 | /* Try parsing as a number */ |
| 1294 | val = (int)strtoul(s, &eptr, 10); |
| 1295 | if (val < 0 || *eptr != '\0') |
| 1296 | return (-1); |
| 1297 | return (val); |
| 1298 | } |
| 1299 | |