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         __u16 speed = pull_u32(skb, 1);
  95 }
  96
  97 static void parse_conn_success(struct neighbor *nb, struct sk_buff *skb,
  98                 __u8 code, struct conn *rconn)
  99 {
 100         struct conn *sconn = rconn->reversedir;
 101
 102         BUG_ON(sconn == 0);
 103
 104         if (unlikely(unlikely(TARGET_OUT != sconn->targettype) ||
 105                         unlikely(nb != sconn->target.out.nb) ||
 106                         unlikely(rconn->target.out.conn_id != 0))) {
 107                 int conn_id = pull_u32(skb, 1);
 108                 struct control_msg_out *cm = alloc_control_msg();
 109                 if (likely(cm != 0))
 110                         send_reset_conn(cm, nb, conn_id);
 111                 return;
 112         }
 113
 114         mutex_lock(&(sconn->rcv_lock));
 115         sconn->target.out.conn_id = pull_u32(skb, 1);
 116         flush_out(sconn);
 117         mutex_unlock(&(sconn->rcv_lock));
 118 }
 119
 120 static void parse_reset(struct neighbor *nb, struct sk_buff *skb,
 121                 __u8 code, struct conn *rconn)
 122 {
 123         rconn->isreset = 1;
 124         reset_conn(rconn);
 125 }
 126
 127 static void conn_cmd(struct neighbor *nb, struct sk_buff *skb, __u8 code,
 128                 void (*parsefunc)(struct neighbor *nb, struct sk_buff *skb,
 129                 __u8 code, struct conn *rconn))
 130 {
 131         __u32 conn_id = pull_u32(skb, 1);
 132         struct conn *rconn = get_conn(conn_id);
 133
 134         if (unlikely(rconn == 0))
 135                 return;
 136
 137         BUG_ON(SOURCE_IN != rconn->sourcetype);
 138         BUG_ON(0 == rconn->reversedir);
 139
 140         if (unlikely(rconn->source.in.nb != nb))
 141                 return;
 142
 143         parsefunc(nb, skb, code, rconn);
 144 }
 145
 146 static void parse_conndata(struct neighbor *nb, struct sk_buff *skb)
 147 {
 148         __u32 conn_id = pull_u32(skb, 1);
 149         __u32 seqno = pull_u32(skb, 1);
 150         __u32 datalength = pull_u32(skb, 1);
 151         char *data = cor_pull_skb(skb, datalength);
 152
 153         BUG_ON(data == 0);
 154
 155         conn_rcv_buildskb(data, datalength, conn_id, seqno);
 156 }
 157
 158 static void parse_connect(struct neighbor *nb, struct sk_buff *skb)
 159 {
 160         struct conn *rconn;
 161         printk(KERN_ERR "pc 1");
 162         __u32 conn_id = pull_u32(skb, 1);
 163         struct control_msg_out *cm = alloc_control_msg();
 164
 165         if (unlikely(cm == 0))
 166                 return;
 167
 168         printk(KERN_ERR "pc 2");
 169         rconn = alloc_conn(GFP_KERNEL);
 170         printk(KERN_ERR "pc 3");
 171
 172         if (unlikely(rconn == 0))
 173                 goto err;
 174
 175         if (conn_init_out(rconn->reversedir, nb)) {
 176                 goto err;
 177         }
 178         printk(KERN_ERR "pc 4");
 179         rconn->reversedir->target.out.conn_id = conn_id;
 180
 181         send_connect_success(cm, nb, rconn->reversedir->target.out.conn_id,
 182                         rconn->source.in.conn_id);
 183         printk(KERN_ERR "pc 5");
 184
 185         if (0) {
 186 err:
 187                 printk(KERN_ERR "pc 6");
 188                 send_reset_conn(cm, nb, conn_id);
 189         }
 190 }
 191
 192 static void kernel_packet2(struct neighbor *nb, struct sk_buff *skb,
 193                 __u32 seqno)
 194 {
 195         struct control_msg_out *cm = alloc_control_msg();
 196         int ack = 0;
 197
 198         if (unlikely(cm == 0))
 199                 return;
 200
 201         while (1) {
 202                 __u32 conn_id;
 203                 __u32 seqno;
 204
 205                 __u8 *codeptr = cor_pull_skb(skb, 1);
 206                 __u8 code;
 207
 208                 if (codeptr == 0)
 209                         break;
 210
 211                 code = *codeptr;
 212
 213                 printk(KERN_ERR "parse2_1 %d", code);
 214
 215                 switch (code) {
 216                 case KP_PADDING:
 217                         break;
 218                 case KP_ACK:
 219                         conn_id = pull_u32(skb, 0);
 220                         seqno = pull_u32(skb, 0);
 221                         ack_received(nb, conn_id, seqno);
 222                         if (conn_id != 0)
 223                                 ack = 1;
 224                         break;
 225                 case KP_SPEED:
 226                         conn_cmd(nb, skb, code, parse_speed);
 227                         ack = 1;
 228                         break;
 229                 case KP_CONNECT:
 230                         parse_connect(nb, skb);
 231                         ack = 1;
 232                         break;
 233                 case KP_CONNECT_SUCCESS:
 234                         conn_cmd(nb, skb, code, parse_conn_success);
 235                         ack = 1;
 236                         break;
 237                 case KP_CONN_DATA:
 238                         parse_conndata(nb, skb);
 239                         ack = 1;
 240                         break;
 241                 case KP_RESET_CONN:
 242                         conn_cmd(nb, skb, code, parse_reset);
 243                         ack = 1;
 244                         break;
 245                 default:
 246                         BUG();
 247                 }
 248         }
 249
 250         if (ack)
 251                 send_ack(cm, nb, 0, seqno);
 252         else
 253                 free_control_msg(cm);
 254 }
 255
 256 void kernel_packet(struct neighbor *nb, struct sk_buff *skb, __u32 seqno)
 257 {
 258         struct sk_buff *skb2 = skb_clone(skb, __GFP_DMA | GFP_KERNEL);
 259
 260         while (1) {
 261                 __u8 *codeptr = cor_pull_skb(skb2, 1);
 262                 __u8 code;
 263
 264                 char *lengthptr;
 265                 __u32 length;
 266
 267                 if (codeptr == 0)
 268                         break;
 269                 code = *codeptr;
 270                 switch (code) {
 271                 case KP_PADDING:
 272                         break;
 273                 case KP_ACK:
 274                         if (cor_pull_skb(skb2, 8) == 0)
 275                                 goto discard;
 276                         break;
 277                 case KP_SPEED:
 278                         if (cor_pull_skb(skb2, 6) == 0)
 279                                 goto discard;
 280                         break;
 281                 case KP_CONNECT:
 282                         if (cor_pull_skb(skb2, 4) == 0)
 283                                 goto discard;
 284                         break;
 285                 case KP_CONNECT_SUCCESS:
 286                         if (cor_pull_skb(skb2, 8) == 0)
 287                                 goto discard;
 288                         break;
 289                 case KP_CONN_DATA:
 290                         if (cor_pull_skb(skb2, 8) == 0)
 291                                 goto discard;
 292                         lengthptr = cor_pull_skb(skb2, 4);
 293                         if (lengthptr == 0)
 294                                 goto discard;
 295                         length = ntohl(*((__u32 *)lengthptr));
 296                         if (cor_pull_skb(skb, length) == 0)
 297                                 goto discard;
 298                         break;
 299                 case KP_RESET_CONN:
 300                         if (cor_pull_skb(skb2, 4) == 0)
 301                                 goto discard;
 302                         break;
 303                 default:
 304                         goto discard;
 305                 }
 306         }
 307         kfree_skb(skb2);
 308         kernel_packet2(nb, skb, seqno);
 309         kfree_skb(skb);
 310         return;
 311 discard:
 312         kfree_skb(skb2);
 313         kfree_skb(skb);
 314 }