net/cor/kpacket_parse.c

   1 /*
   2  *      Connection oriented routing
   3  *      Copyright (C) 2007-2008 Michael Blizek
   4  *
   5  *      This program is free software; you can redistribute it and/or
   6  *      modify it under the terms of the GNU General Public License
   7  *      as published by the Free Software Foundation; either version 2
   8  *      of the License, or (at your option) any later version.
   9  *
  10  *      This program is distributed in the hope that it will be useful,
  11  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *      GNU General Public License for more details.
  14  *
  15  *      You should have received a copy of the GNU General Public License
  16  *      along with this program; if not, write to the Free Software
  17  *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  *      02110-1301, USA.
  19  */
  20
  21 #include <asm/byteorder.h>
  22
  23 #include "cor.h"
  24
  25 static __u64 pull_u64(struct sk_buff *skb, int convbo)
  26 {
  27         char *ptr = cor_pull_skb(skb, 8);
  28
  29         __u64 ret = 0;
  30
  31         BUG_ON(0 == ptr);
  32
  33         ((char *)&ret)[0] = ptr[0];
  34         ((char *)&ret)[1] = ptr[1];
  35         ((char *)&ret)[2] = ptr[2];
  36         ((char *)&ret)[3] = ptr[3];
  37         ((char *)&ret)[4] = ptr[4];
  38         ((char *)&ret)[5] = ptr[5];
  39         ((char *)&ret)[6] = ptr[6];
  40         ((char *)&ret)[7] = ptr[7];
  41
  42         if (convbo)
  43                 return be64_to_cpu(ret);
  44         return ret;
  45 }
  46
  47 static __u32 pull_u32(struct sk_buff *skb, int convbo)
  48 {
  49         char *ptr = cor_pull_skb(skb, 4);
  50
  51         __u32 ret = 0;
  52
  53         BUG_ON(0 == ptr);
  54
  55         ((char *)&ret)[0] = ptr[0];
  56         ((char *)&ret)[1] = ptr[1];
  57         ((char *)&ret)[2] = ptr[2];
  58         ((char *)&ret)[3] = ptr[3];
  59
  60         if (convbo)
  61                 return be32_to_cpu(ret);
  62         return ret;
  63 }
  64
  65 static __u16 pull_u16(struct sk_buff *skb, int convbo)
  66 {
  67         char *ptr = cor_pull_skb(skb, 2);
  68
  69         __u16 ret = 0;
  70
  71         BUG_ON(0 == ptr);
  72
  73         ((char *)&ret)[0] = ptr[0];
  74         ((char *)&ret)[1] = ptr[1];
  75
  76         if (convbo)
  77                 return be16_to_cpu(ret);
  78         return ret;
  79 }
  80
  81 static __u8 pull_u8(struct sk_buff *skb)
  82 {
  83         char *ptr = cor_pull_skb(skb, 1);
  84         BUG_ON(0 == ptr);
  85         return *ptr;
  86 }
  87
  88 static void pong_rcvd(struct conn *rconn)
  89 {
  90         struct neighbor *nb = rconn->source.in.nb;
  91         if (atomic_read(&(rconn->source.in.pong_awaiting)) != 0) {
  92                 mutex_lock(&(nb->conn_list_lock));
  93                 if (atomic_read(&(rconn->source.in.pong_awaiting)) == 0)
  94                         goto unlock;
  95
  96                 atomic_set(&(rconn->source.in.pong_awaiting), 0);
  97                 nb->pong_conns_expected--;
  98 unlock:
  99                 mutex_unlock(&(nb->conn_list_lock));
 100         }
 101 }
 102
 103 static void ping_all_conns(struct neighbor *nb)
 104 {
 105         struct conn *rconn;
 106
 107         mutex_lock(&(nb->conn_list_lock));
 108
 109         if (list_empty(&(nb->snd_conn_list))) {
 110                 BUG_ON(nb->num_send_conns != 0);
 111                 goto out;
 112         }
 113
 114         rconn = container_of(nb->snd_conn_list.next, struct conn,
 115                         target.out.nb_list);
 116
 117         BUG_ON(rconn->targettype != TARGET_OUT);
 118
 119         nb->next_ping_conn = rconn;
 120         nb->ping_conns_remaining = nb->num_send_conns;
 121         kref_get(&(rconn->ref));
 122
 123 out:
 124         mutex_unlock(&(nb->conn_list_lock));
 125 }
 126
 127 static void discard_ack_conn(struct neighbor *nb, struct sk_buff *skb)
 128 {
 129         pull_u32(skb, 1); /* seqno */
 130         pull_u8(skb); /* window */
 131 }
 132
 133 static void discard_set_conn_credits(struct neighbor *nb, struct sk_buff *skb)
 134 {
 135         pull_u32(skb, 1); /* credit_rate */
 136 }
 137
 138 static void parse_ack_conn(struct neighbor *nb, struct sk_buff *skb,
 139                 __u32 kpacket_seqno, struct conn *rconn)
 140 {
 141         __u32 seqno = pull_u32(skb, 1);
 142         __u8 window = pull_u8(skb);
 143
 144         pong_rcvd(rconn);
 145
 146         conn_ack_rcvd(kpacket_seqno, rconn->reversedir, seqno, window, 0, 0);
 147 }
 148
 149 static void discard_ack_conn_ooo(struct neighbor *nb, struct sk_buff *skb)
 150 {
 151         pull_u32(skb, 1); /* seqno */
 152         pull_u8(skb); /* window */
 153         pull_u32(skb, 1); /* seqno_ooo */
 154         pull_u32(skb, 1); /* length */
 155 }
 156
 157 static void parse_ack_conn_ooo(struct neighbor *nb, struct sk_buff *skb,
 158                 __u32 kpacket_seqno, struct conn *rconn)
 159 {
 160         __u32 seqno = pull_u32(skb, 1);
 161         __u8 window = pull_u8(skb);
 162         __u32 seqno_ooo = pull_u32(skb, 1);
 163         __u32 length = pull_u32(skb, 1);
 164
 165         pong_rcvd(rconn);
 166
 167         conn_ack_rcvd(kpacket_seqno, rconn->reversedir, seqno, window,
 168                         seqno_ooo, length);
 169 }
 170
 171 static void discard_conn_success(struct neighbor *nb, struct sk_buff *skb)
 172 {
 173         __u32 conn_id = pull_u32(skb, 1);
 174         struct control_msg_out *cm = alloc_control_msg(nb, ACM_PRIORITY_HIGH);
 175
 176         if (unlikely(cm == 0))
 177                 send_ping_all_conns(nb);
 178         else
 179                 send_reset_conn(cm, conn_id);
 180 }
 181
 182 static void parse_conn_success(struct neighbor *nb, struct sk_buff *skb,
 183                 __u32 seqno, struct conn *rconn)
 184 {
 185         struct conn *sconn = rconn->reversedir;
 186
 187         __u32 conn_id = pull_u32(skb, 1);
 188
 189         BUG_ON(sconn == 0);
 190
 191         mutex_lock(&(sconn->rcv_lock));
 192
 193         if (unlikely(unlikely(sconn->targettype != TARGET_OUT) ||
 194                         unlikely(sconn->target.out.nb != nb) ||
 195                         unlikely(sconn->target.out.conn_id != 0 &&
 196                         sconn->target.out.conn_id != conn_id))) {
 197                 goto reset;
 198         }
 199
 200         if (likely(sconn->target.out.conn_id == 0)) {
 201                 sconn->target.out.conn_id = conn_id;
 202
 203                 if (unlikely(atomic_read(&(sconn->isreset)) != 0))
 204                         goto reset;
 205
 206                 insert_reverse_connid(sconn);
 207         }
 208
 209         flush_out(sconn);
 210
 211         if (0) {
 212                 struct control_msg_out *cm;
 213 reset:
 214                 cm = alloc_control_msg(nb, ACM_PRIORITY_HIGH);
 215                 if (unlikely(cm == 0))
 216                         send_ping_all_conns(nb);
 217                 else
 218                         send_reset_conn(cm, conn_id);
 219         }
 220         mutex_unlock(&(sconn->rcv_lock));
 221 }
 222
 223 static void parse_reset(struct neighbor *nb, struct sk_buff *skb, __u32 seqno,
 224                 struct conn *rconn)
 225 {
 226         #warning todo ping conn waiting?
 227         atomic_cmpxchg(&(rconn->reversedir->isreset), 0, 1);
 228         reset_conn(rconn);
 229 }
 230
 231 static void parse_ping_conn(struct neighbor *nb, struct sk_buff *skb,
 232                 __u32 seqno, struct conn *rconn)
 233 {
 234         struct control_msg_out *cm = alloc_control_msg(nb, ACM_PRIORITY_MED);
 235
 236         if (unlikely(cm == 0))
 237                 return;
 238
 239         mutex_lock(&(rconn->rcv_lock));
 240         #warning todo set window
 241         send_ack_conn(cm, rconn->reversedir->target.out.conn_id,
 242                                 rconn->source.in.next_seqno, enc_window(65536));
 243         mutex_unlock(&(rconn->rcv_lock));
 244 }
 245
 246 static void parse_set_conn_credits(struct neighbor *nb, struct sk_buff *skb,
 247                 __u32 seqno, struct conn *rconn)
 248 {
 249         __u32 crate_in = pull_u32(skb, 1);
 250         set_conn_in_crate(rconn, crate_in);
 251 }
 252
 253 static void conn_cmd(struct neighbor *nb, struct sk_buff *skb, __u32 seqno,
 254                 __u8 code, void (*parsefunc)(struct neighbor *nb,
 255                 struct sk_buff *skb, __u32 seqno, struct conn *rconn),
 256                 void (*readdiscardfunc)(struct neighbor *nb,
 257                 struct sk_buff *skb))
 258 {
 259         __u32 conn_id = pull_u32(skb, 1);
 260         struct conn *rconn = get_conn(conn_id);
 261
 262         if (unlikely(rconn == 0))
 263                 goto err;
 264
 265         BUG_ON(rconn->sourcetype != SOURCE_IN);
 266         BUG_ON(rconn->reversedir == 0);
 267
 268         if (unlikely(rconn->source.in.nb != nb))
 269                 goto err;
 270
 271         parsefunc(nb, skb, seqno, rconn);
 272         if (0) {
 273                 struct control_msg_out *cm;
 274 err:
 275                 cm = alloc_control_msg(nb, ACM_PRIORITY_MED);
 276                 if (likely(cm != 0))
 277                         send_connid_unknown(cm, conn_id);
 278
 279                 if (readdiscardfunc != 0)
 280                         readdiscardfunc(nb, skb);
 281         }
 282         if (likely(rconn != 0))
 283                 kref_put(&(rconn->ref), free_conn);
 284 }
 285
 286 static void parse_conndata(struct neighbor *nb, struct sk_buff *skb)
 287 {
 288         __u32 conn_id = pull_u32(skb, 1);
 289         __u32 seqno = pull_u32(skb, 1);
 290         __u16 datalength = pull_u16(skb, 1);
 291         char *data = cor_pull_skb(skb, datalength);
 292
 293         BUG_ON(data == 0);
 294
 295         conn_rcv_buildskb(data, datalength, conn_id, seqno);
 296 }
 297
 298 static void parse_connect(struct neighbor *nb, struct sk_buff *skb)
 299 {
 300         struct conn *rconn;
 301         __u32 conn_id = pull_u32(skb, 1);
 302         struct control_msg_out *cm = alloc_control_msg(nb, ACM_PRIORITY_HIGH);
 303
 304         if (unlikely(cm == 0))
 305                 return;
 306
 307         rconn = alloc_conn(GFP_KERNEL);
 308
 309         if (unlikely(rconn == 0))
 310                 goto err;
 311
 312         if (unlikely(conn_init_out(rconn->reversedir, nb)))
 313                 goto err;
 314
 315         rconn->reversedir->target.out.conn_id = conn_id;
 316         insert_reverse_connid(rconn->reversedir);
 317
 318         send_connect_success(cm, rconn->reversedir->target.out.conn_id,
 319                         rconn->source.in.conn_id);
 320
 321         if (0) {
 322 err:
 323                 send_reset_conn(cm, conn_id);
 324         }
 325 }
 326
 327 static void parse_set_credits(struct neighbor *nb, struct sk_buff *skb)
 328 {
 329         __u64 credits = pull_u64(skb, 1);
 330         __s32 creditrate_initial = pull_u32(skb, 1);
 331         __u32 creditrate_earning = pull_u32(skb, 1);
 332         __u32 creditrate_spending = pull_u32(skb, 1);
 333
 334         set_credits(nb, credits, creditrate_initial, creditrate_earning,
 335                         creditrate_spending);
 336 }
 337
 338 #warning todo set window on connect/connect_success
 339 static void kernel_packet2(struct neighbor *nb, struct sk_buff *skb,
 340                 __u32 seqno1)
 341 {
 342         int ack = 0;
 343
 344         while (1) {
 345                 struct conn *conn;
 346                 __u32 seqno2;
 347
 348                 __u32 conn_id;
 349
 350                 __u32 cookie;
 351                 __u32 respdelay;
 352
 353                 __u32 max_cmsg_dly;
 354
 355                 __u8 *codeptr = cor_pull_skb(skb, 1);
 356                 __u8 code;
 357
 358                 if (codeptr == 0)
 359                         break;
 360
 361                 code = *codeptr;
 362
 363                 switch (code) {
 364                 case KP_PADDING:
 365                         break;
 366                 case KP_PING:
 367                         cookie = pull_u32(skb, 0);
 368                         send_pong(nb, cookie);
 369                         break;
 370                 case KP_PONG:
 371                         cookie = pull_u32(skb, 0);
 372                         respdelay = pull_u32(skb, 1);
 373                         ping_resp(nb, cookie, respdelay);
 374                         ack = 1;
 375                         break;
 376                 case KP_ACK:
 377                         seqno2 = pull_u32(skb, 1);
 378                         kern_ack_rcvd(nb, seqno2);
 379                         break;
 380                 case KP_ACK_CONN:
 381                         conn_cmd(nb, skb, seqno1, code, parse_ack_conn,
 382                                         discard_ack_conn);
 383                         ack = 1;
 384                         break;
 385                 case KP_ACK_CONN_OOO:
 386                         conn_cmd(nb, skb, seqno1, code, parse_ack_conn_ooo,
 387                                         discard_ack_conn_ooo);
 388                         ack = 1;
 389                         break;
 390                 case KP_CONNECT:
 391                         parse_connect(nb, skb);
 392                         ack = 1;
 393                         break;
 394                 case KP_CONNECT_SUCCESS:
 395                         conn_cmd(nb, skb, seqno1, code, parse_conn_success,
 396                                         discard_conn_success);
 397                         ack = 1;
 398                         break;
 399                 case KP_CONN_DATA:
 400                         parse_conndata(nb, skb);
 401                         break;
 402                 case KP_PING_CONN:
 403                         conn_id = pull_u32(skb, 1);
 404                         conn_cmd(nb, skb, seqno1, code, parse_ping_conn, 0);
 405                         ack = 1;
 406                         break;
 407                 case KP_RESET_CONN:
 408                         conn_cmd(nb, skb, seqno1, code, parse_reset, 0);
 409                         ack = 1;
 410                         break;
 411                 case KP_CONNID_UNKNOWN:
 412                         conn_id = pull_u32(skb, 1);
 413                         conn = get_conn_reverse(nb, conn_id);
 414                         if (conn != 0) {
 415                                 BUG_ON(conn->reversedir->sourcetype !=
 416                                                 SOURCE_IN);
 417                                 pong_rcvd(conn->reversedir);
 418                                 atomic_cmpxchg(&(conn->isreset), 0, 1);
 419                                 reset_conn(conn);
 420                                 conn = 0;
 421                         }
 422                         ack = 1;
 423                         break;
 424                 case KP_PING_ALL_CONNS:
 425                         ping_all_conns(nb);
 426                         ack = 1;
 427                         break;
 428                 case KP_SET_MAX_CMSG_DELAY:
 429                         max_cmsg_dly = pull_u32(skb, 1);
 430                         if (((__u64) max_cmsg_dly) * 1000 > ((__u64)
 431                                         (max_cmsg_dly * 1000)))
 432                                 max_cmsg_dly = 400000000;
 433                         else
 434                                 max_cmsg_dly *= 100;
 435                         atomic_set(&(nb->max_remote_cmsg_delay), max_cmsg_dly);
 436                         ack = 1;
 437                         break;
 438                 case KP_SET_CREDITS:
 439                         parse_set_credits(nb, skb);
 440                         ack = 1;
 441                         break;
 442                 case KP_SET_CONN_CREDITS:
 443                         conn_cmd(nb, skb, seqno1, code, parse_set_conn_credits,
 444                                 discard_set_conn_credits);
 445                         ack = 1;
 446                         break;
 447                 default:
 448                         BUG();
 449                 }
 450         }
 451
 452         if (ack)
 453                 send_ack(nb, seqno1);
 454 }
 455
 456 void kernel_packet(struct neighbor *nb, struct sk_buff *skb, __u32 seqno)
 457 {
 458         struct sk_buff *skb2 = skb_clone(skb, __GFP_DMA | GFP_KERNEL);
 459
 460         while (1) {
 461                 __u8 *codeptr = cor_pull_skb(skb2, 1);
 462                 __u8 code;
 463
 464                 char *lengthptr;
 465                 __u32 length;
 466
 467                 if (codeptr == 0)
 468                         break;
 469                 code = *codeptr;
 470
 471                 switch (code) {
 472                 case KP_PADDING:
 473                         break;
 474                 case KP_PING:
 475                         if (cor_pull_skb(skb2, 4) == 0)
 476                                 goto discard;
 477                         break;
 478                 case KP_PONG:
 479                         if (cor_pull_skb(skb2, 8) == 0)
 480                                 goto discard;
 481                         break;
 482                 case KP_ACK:
 483                         if (cor_pull_skb(skb2, 4) == 0)
 484                                 goto discard;
 485                         break;
 486                 case KP_ACK_CONN:
 487                         if (cor_pull_skb(skb2, 9) == 0)
 488                                 goto discard;
 489                         break;
 490                 case KP_ACK_CONN_OOO:
 491                         if (cor_pull_skb(skb2, 17) == 0)
 492                                 goto discard;
 493                         break;
 494                 case KP_CONNECT:
 495                         if (cor_pull_skb(skb2, 4) == 0)
 496                                 goto discard;
 497                         break;
 498                 case KP_CONNECT_SUCCESS:
 499                         if (cor_pull_skb(skb2, 8) == 0)
 500                                 goto discard;
 501                         break;
 502                 case KP_CONN_DATA:
 503                         if (cor_pull_skb(skb2, 8) == 0)
 504                                 goto discard;
 505                         lengthptr = cor_pull_skb(skb2, 2);
 506                         if (lengthptr == 0)
 507                                 goto discard;
 508                         length = ntohs(*((__u16 *)lengthptr));
 509                         if (cor_pull_skb(skb2, length) == 0)
 510                                 goto discard;
 511                         break;
 512                 case KP_PING_CONN:
 513                 case KP_RESET_CONN:
 514                 case KP_CONNID_UNKNOWN:
 515                         if (cor_pull_skb(skb2, 4) == 0)
 516                                 goto discard;
 517                         break;
 518                 case KP_PING_ALL_CONNS:
 519                         break;
 520                 case KP_SET_MAX_CMSG_DELAY:
 521                         if (cor_pull_skb(skb2, 4) == 0)
 522                                 goto discard;
 523                         break;
 524                 case KP_SET_CREDITS:
 525                         if (cor_pull_skb(skb2, 20) == 0)
 526                                 goto discard;
 527                         break;
 528                 case KP_SET_CONN_CREDITS:
 529                         if (cor_pull_skb(skb2, 8) == 0)
 530                                 goto discard;
 531                         break;
 532                 default:
 533                         goto discard;
 534                 }
 535         }
 536         kfree_skb(skb2);
 537         kernel_packet2(nb, skb, seqno);
 538         kfree_skb(skb);
 539         return;
 540 discard:
 541         kfree_skb(skb2);
 542         kfree_skb(skb);
 543 }