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 /* not used, avoid compiler warning
  26  * static __u64 pull_u64(struct sk_buff *skb, int convbo)
  27 {
  28         char *ptr = cor_pull_skb(skb, 8);
  29
  30         __u64 ret = 0;
  31
  32         BUG_ON(0 == ptr);
  33
  34         ((char *)&ret)[0] = ptr[0];
  35         ((char *)&ret)[1] = ptr[1];
  36         ((char *)&ret)[2] = ptr[2];
  37         ((char *)&ret)[3] = ptr[3];
  38         ((char *)&ret)[4] = ptr[4];
  39         ((char *)&ret)[5] = ptr[5];
  40         ((char *)&ret)[6] = ptr[6];
  41         ((char *)&ret)[7] = ptr[7];
  42
  43         if (convbo)
  44                 return be64_to_cpu(ret);
  45         return ret;
  46 } */
  47
  48 static __u32 pull_u32(struct sk_buff *skb, int convbo)
  49 {
  50         char *ptr = cor_pull_skb(skb, 4);
  51
  52         __u32 ret = 0;
  53
  54         BUG_ON(0 == ptr);
  55
  56         ((char *)&ret)[0] = ptr[0];
  57         ((char *)&ret)[1] = ptr[1];
  58         ((char *)&ret)[2] = ptr[2];
  59         ((char *)&ret)[3] = ptr[3];
  60
  61         if (convbo)
  62                 return be32_to_cpu(ret);
  63         return ret;
  64 }
  65
  66 /* not used, avoid compiler warning
  67 static __u16 pull_u16(struct sk_buff *skb, int convbo)
  68 {
  69         char *ptr = cor_pull_skb(skb, 2);
  70
  71         __u16 ret = 0;
  72
  73         BUG_ON(0 == ptr);
  74
  75         ((char *)&ret)[0] = ptr[0];
  76         ((char *)&ret)[1] = ptr[1];
  77
  78         if (convbo)
  79                 return be16_to_cpu(ret);
  80         return ret;
  81 } */
  82
  83 static __u8 pull_u8(struct sk_buff *skb)
  84 {
  85         char *ptr = cor_pull_skb(skb, 1);
  86         BUG_ON(0 == ptr);
  87         return *ptr;
  88 }
  89
  90 #warning todo
  91 static void parse_speed(struct neighbor *nb, struct sk_buff *skb,
  92                 __u8 code, struct conn *rconn)
  93 {
  94 }
  95
  96 static void parse_conn_success(struct neighbor *nb, struct sk_buff *skb,
  97                 __u8 code, struct conn *rconn)
  98 {
  99         struct conn *sconn = rconn->reversedir;
 100
 101         BUG_ON(sconn == 0);
 102
 103         if (unlikely(unlikely(TARGET_OUT != sconn->targettype) ||
 104                         unlikely(nb != sconn->target.out.nb) ||
 105                         unlikely(rconn->target.out.conn_id != 0))) {
 106                 int conn_id = pull_u32(skb, 1);
 107                 struct control_msg_out *cm = alloc_control_msg();
 108                 if (likely(cm != 0))
 109                         send_reset_conn(cm, nb, conn_id);
 110                 return;
 111         }
 112
 113         rconn->target.out.conn_id = pull_u32(skb, 1);
 114
 115         drain_ooo_queue(sconn);
 116 }
 117
 118 static void parse_conn_failed(struct neighbor *nb, struct sk_buff *skb,
 119                 __u8 code, struct conn *rconn)
 120 {
 121         rconn->isreset = 1;
 122         reset_conn(rconn);
 123 }
 124
 125 static void parse_reset(struct neighbor *nb, struct sk_buff *skb,
 126                 __u8 code, struct conn *rconn)
 127 {
 128         rconn->isreset = 1;
 129         reset_conn(rconn);
 130 }
 131
 132 static void conn_cmd(struct neighbor *nb, struct sk_buff *skb, __u8 code,
 133                 void (*parsefunc)(struct neighbor *nb, struct sk_buff *skb,
 134                 __u8 code, struct conn *rconn))
 135 {
 136         __u32 conn_id = pull_u32(skb, 1);
 137         struct conn *rconn = get_conn(conn_id);
 138
 139         if (unlikely(rconn == 0))
 140                 goto reset;
 141
 142         BUG_ON(SOURCE_IN != rconn->sourcetype);
 143         BUG_ON(0 == rconn->reversedir);
 144
 145         if (unlikely(rconn->source.in.nb != nb))
 146                 goto reset;
 147
 148         parsefunc(nb, skb, code, rconn);
 149
 150         if (0) {
 151 reset:
 152                 #warning todo reset backwards
 153                 return;
 154
 155         }
 156 }
 157
 158 static void parse_conndata(struct neighbor *nb, struct sk_buff *skb)
 159 {
 160         __u32 conn_id = pull_u32(skb, 1);
 161         __u32 seqno = pull_u32(skb, 1);
 162         __u32 datalength = pull_u32(skb, 1);
 163         char *data = cor_pull_skb(skb, datalength);
 164
 165         BUG_ON(data == 0);
 166
 167         conn_rcv_buildskb(data, datalength, conn_id, seqno);
 168 }
 169
 170 static void parse_connect(struct neighbor *nb, struct sk_buff *skb)
 171 {
 172         struct conn *rconn;
 173         __u32 conn_id = pull_u32(skb, 1);
 174         struct control_msg_out *cm = alloc_control_msg();
 175
 176         if (unlikely(cm == 0))
 177                 return;
 178
 179         rconn = alloc_conn(GFP_KERNEL);
 180
 181         if (unlikely(rconn == 0))
 182                 goto err;
 183
 184         if (conn_init_out(rconn->reversedir, nb)) {
 185                 goto err;
 186         }
 187         rconn->target.out.conn_id = conn_id;
 188
 189         send_connect_success(cm, rconn);
 190 err:
 191         send_connect_failed_temp(cm, nb, conn_id);
 192         return;
 193 }
 194
 195 static void kernel_packet2(struct neighbor *nb, struct sk_buff *skb,
 196                 __u32 seqno)
 197 {
 198         struct control_msg_out *cm = alloc_control_msg();
 199         int ack = 0;
 200
 201         if (unlikely(cm == 0))
 202                 return;
 203
 204         while (1) {
 205                 __u32 conn_id;
 206                 __u32 seqno;
 207
 208                 __u8 code = pull_u8(skb);
 209
 210                 switch (code) {
 211                 case KP_PADDING:
 212                         break;
 213                 case KP_ACK:
 214                         conn_id = pull_u32(skb, 0);
 215                         seqno = pull_u32(skb, 0);
 216                         ack_received(nb, conn_id, seqno, 0);
 217                         break;
 218                 case KP_NACK:
 219                         conn_id = pull_u32(skb, 0);
 220                         seqno = pull_u32(skb, 0);
 221                         ack_received(nb, conn_id, seqno, 1);
 222                         break;
 223                 case KP_SPEED:
 224                         conn_cmd(nb, skb, code, parse_speed);
 225                         break;
 226                 case KP_CONNECT:
 227                         parse_connect(nb, skb);
 228                         break;
 229                 case KP_CONNECT_SUCCESS:
 230                         conn_cmd(nb, skb, code, parse_conn_success);
 231                         break;
 232                 case KP_CONNECT_FAILED_TEMP:
 233                 case KP_CONNECT_FAILED_PERM:
 234                         conn_cmd(nb, skb, code, parse_conn_failed);
 235                         break;
 236                 case KP_CONN_DATA:
 237                         parse_conndata(nb, skb);
 238                         break;
 239                         /*
 240                         #warning todo is next packet?
 241                         #warning todo move to next packet
 242                         packet_id = pull_u32(skb);
 243                         struc packet_id *pid = search_packet_id(packet_id);
 244                         if (code == KP_FLUSH_CONN_BUF)
 245                                 #warning todo offset, timeout
 246                                 flush(pid->conn, 0, 10);
 247                         else if (code == KP_CONN_DATA) {
 248                                 #warning todo
 249                                 //skb_trim(skb, len);
 250                         } else if (code == KP_CONN_EOF)
 251                                 #warning todo timeout
 252                                 eof(pid->conn, 10);
 253                         else if (code == KP_CONN_RESET_FW)
 254                                 reset(pid->conn)
 255                         else
 256                                 BUG();
 257                         break;*/
 258                 case KP_RESET_CONN:
 259                         conn_cmd(nb, skb, code, parse_reset);
 260                         break;
 261                 default:
 262                         BUG();
 263                 }
 264         }
 265
 266         if (ack)
 267                 send_ack(cm, nb, 0, seqno);
 268         else
 269                 free_control_msg(cm);
 270 }
 271
 272 void kernel_packet(struct neighbor *nb, struct sk_buff *skb, __u32 seqno)
 273 {
 274         struct sk_buff *skb2 = skb_clone(skb, __GFP_DMA | GFP_KERNEL);
 275
 276         while (1) {
 277                 __u8 *codeptr = cor_pull_skb(skb2, 1);
 278                 __u8 code;
 279
 280                 char *lengthptr;
 281                 __u32 length;
 282
 283                 if (codeptr == 0)
 284                         goto discard;
 285                 code = *codeptr;
 286                 switch (code) {
 287                 case KP_PADDING:
 288                         break;
 289                 case KP_ACK:
 290                 case KP_NACK:
 291                         if (cor_pull_skb(skb2, 4) == 0)
 292                                 goto discard;
 293                         break;
 294                 case KP_SPEED:
 295                 case KP_CONNECT:
 296                         if (cor_pull_skb(skb2, 5) == 0)
 297                                 goto discard;
 298                         break;
 299                 case KP_CONNECT_SUCCESS:
 300                         if (cor_pull_skb(skb2, 4) == 0)
 301                                 goto discard;
 302                         break;
 303                 case KP_CONNECT_FAILED_TEMP:
 304                 case KP_CONNECT_FAILED_PERM:
 305                         if (cor_pull_skb(skb2, 4) == 0)
 306                                 goto discard;
 307                         break;
 308                 case KP_CONN_DATA:
 309                         if (cor_pull_skb(skb2, 4) == 0)
 310                                 goto discard;
 311                         lengthptr = cor_pull_skb(skb2, 4);
 312                         if (lengthptr == 0)
 313                                 goto discard;
 314                         length = ntohl(*((__u32 *)lengthptr));
 315                         if (cor_pull_skb(skb, length) == 0)
 316                                 goto discard;
 317                         break;
 318                 case KP_RESET_CONN:
 319                         if (cor_pull_skb(skb2, 4) == 0)
 320                                 goto discard;
 321                         break;
 322                 default:
 323                         goto discard;
 324                 }
 325         }
 326         kfree_skb(skb2);
 327         kernel_packet2(nb, skb, seqno);
 328         kfree_skb(skb);
 329         return;
 330 discard:
 331         kfree_skb(skb2);
 332         kfree_skb(skb);
 333 }