Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* net/sched/sch_dsmark.c - Differentiated Services field marker */ |
| 2 | |
| 3 | /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ |
| 4 | |
| 5 | |
| 6 | #include <linux/config.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/string.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/skbuff.h> |
| 13 | #include <linux/netdevice.h> /* for pkt_sched */ |
| 14 | #include <linux/rtnetlink.h> |
| 15 | #include <net/pkt_sched.h> |
| 16 | #include <net/dsfield.h> |
| 17 | #include <net/inet_ecn.h> |
| 18 | #include <asm/byteorder.h> |
| 19 | |
| 20 | |
| 21 | #if 1 /* control */ |
| 22 | #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) |
| 23 | #else |
| 24 | #define DPRINTK(format,args...) |
| 25 | #endif |
| 26 | |
| 27 | #if 0 /* data */ |
| 28 | #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args) |
| 29 | #else |
| 30 | #define D2PRINTK(format,args...) |
| 31 | #endif |
| 32 | |
| 33 | |
| 34 | #define PRIV(sch) qdisc_priv(sch) |
| 35 | |
| 36 | |
| 37 | /* |
| 38 | * classid class marking |
| 39 | * ------- ----- ------- |
| 40 | * n/a 0 n/a |
| 41 | * x:0 1 use entry [0] |
| 42 | * ... ... ... |
| 43 | * x:y y>0 y+1 use entry [y] |
| 44 | * ... ... ... |
| 45 | * x:indices-1 indices use entry [indices-1] |
| 46 | * ... ... ... |
| 47 | * x:y y+1 use entry [y & (indices-1)] |
| 48 | * ... ... ... |
| 49 | * 0xffff 0x10000 use entry [indices-1] |
| 50 | */ |
| 51 | |
| 52 | |
| 53 | #define NO_DEFAULT_INDEX (1 << 16) |
| 54 | |
| 55 | struct dsmark_qdisc_data { |
| 56 | struct Qdisc *q; |
| 57 | struct tcf_proto *filter_list; |
| 58 | __u8 *mask; /* "owns" the array */ |
| 59 | __u8 *value; |
| 60 | __u16 indices; |
| 61 | __u32 default_index; /* index range is 0...0xffff */ |
| 62 | int set_tc_index; |
| 63 | }; |
| 64 | |
| 65 | |
| 66 | /* ------------------------- Class/flow operations ------------------------- */ |
| 67 | |
| 68 | |
| 69 | static int dsmark_graft(struct Qdisc *sch,unsigned long arg, |
| 70 | struct Qdisc *new,struct Qdisc **old) |
| 71 | { |
| 72 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 73 | |
| 74 | DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",sch,p,new, |
| 75 | old); |
Thomas Graf | 486b53e | 2005-05-31 15:16:52 -0700 | [diff] [blame^] | 76 | |
| 77 | if (new == NULL) { |
| 78 | new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops); |
| 79 | if (new == NULL) |
| 80 | new = &noop_qdisc; |
| 81 | } |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | sch_tree_lock(sch); |
| 84 | *old = xchg(&p->q,new); |
| 85 | if (*old) |
| 86 | qdisc_reset(*old); |
| 87 | sch->q.qlen = 0; |
| 88 | sch_tree_unlock(sch); /* @@@ move up ? */ |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg) |
| 94 | { |
| 95 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 96 | |
| 97 | return p->q; |
| 98 | } |
| 99 | |
| 100 | |
| 101 | static unsigned long dsmark_get(struct Qdisc *sch,u32 classid) |
| 102 | { |
| 103 | struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch); |
| 104 | |
| 105 | DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid); |
| 106 | return TC_H_MIN(classid)+1; |
| 107 | } |
| 108 | |
| 109 | |
| 110 | static unsigned long dsmark_bind_filter(struct Qdisc *sch, |
| 111 | unsigned long parent, u32 classid) |
| 112 | { |
| 113 | return dsmark_get(sch,classid); |
| 114 | } |
| 115 | |
| 116 | |
| 117 | static void dsmark_put(struct Qdisc *sch, unsigned long cl) |
| 118 | { |
| 119 | } |
| 120 | |
| 121 | |
| 122 | static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent, |
| 123 | struct rtattr **tca, unsigned long *arg) |
| 124 | { |
| 125 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 126 | struct rtattr *opt = tca[TCA_OPTIONS-1]; |
| 127 | struct rtattr *tb[TCA_DSMARK_MAX]; |
| 128 | |
| 129 | DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x)," |
| 130 | "arg 0x%lx\n",sch,p,classid,parent,*arg); |
| 131 | if (*arg > p->indices) |
| 132 | return -ENOENT; |
| 133 | if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt)) |
| 134 | return -EINVAL; |
| 135 | if (tb[TCA_DSMARK_MASK-1]) { |
| 136 | if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1])) |
| 137 | return -EINVAL; |
| 138 | p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]); |
| 139 | } |
| 140 | if (tb[TCA_DSMARK_VALUE-1]) { |
| 141 | if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1])) |
| 142 | return -EINVAL; |
| 143 | p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]); |
| 144 | } |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | |
| 149 | static int dsmark_delete(struct Qdisc *sch,unsigned long arg) |
| 150 | { |
| 151 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 152 | |
| 153 | if (!arg || arg > p->indices) |
| 154 | return -EINVAL; |
| 155 | p->mask[arg-1] = 0xff; |
| 156 | p->value[arg-1] = 0; |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker) |
| 162 | { |
| 163 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 164 | int i; |
| 165 | |
| 166 | DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker); |
| 167 | if (walker->stop) |
| 168 | return; |
| 169 | for (i = 0; i < p->indices; i++) { |
| 170 | if (p->mask[i] == 0xff && !p->value[i]) |
Thomas Graf | 0451eb0 | 2005-05-31 15:15:58 -0700 | [diff] [blame] | 171 | goto ignore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | if (walker->count >= walker->skip) { |
| 173 | if (walker->fn(sch, i+1, walker) < 0) { |
| 174 | walker->stop = 1; |
| 175 | break; |
| 176 | } |
| 177 | } |
Thomas Graf | 0451eb0 | 2005-05-31 15:15:58 -0700 | [diff] [blame] | 178 | ignore: |
| 179 | walker->count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | } |
| 182 | |
| 183 | |
| 184 | static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl) |
| 185 | { |
| 186 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 187 | |
| 188 | return &p->filter_list; |
| 189 | } |
| 190 | |
| 191 | |
| 192 | /* --------------------------- Qdisc operations ---------------------------- */ |
| 193 | |
| 194 | |
| 195 | static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch) |
| 196 | { |
| 197 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 198 | struct tcf_result res; |
| 199 | int result; |
| 200 | int ret = NET_XMIT_POLICED; |
| 201 | |
| 202 | D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p); |
| 203 | if (p->set_tc_index) { |
| 204 | /* FIXME: Safe with non-linear skbs? --RR */ |
| 205 | switch (skb->protocol) { |
| 206 | case __constant_htons(ETH_P_IP): |
| 207 | skb->tc_index = ipv4_get_dsfield(skb->nh.iph) |
| 208 | & ~INET_ECN_MASK; |
| 209 | break; |
| 210 | case __constant_htons(ETH_P_IPV6): |
| 211 | skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h) |
| 212 | & ~INET_ECN_MASK; |
| 213 | break; |
| 214 | default: |
| 215 | skb->tc_index = 0; |
| 216 | break; |
| 217 | }; |
| 218 | } |
| 219 | result = TC_POLICE_OK; /* be nice to gcc */ |
| 220 | if (TC_H_MAJ(skb->priority) == sch->handle) { |
| 221 | skb->tc_index = TC_H_MIN(skb->priority); |
| 222 | } else { |
| 223 | result = tc_classify(skb,p->filter_list,&res); |
| 224 | D2PRINTK("result %d class 0x%04x\n",result,res.classid); |
| 225 | switch (result) { |
| 226 | #ifdef CONFIG_NET_CLS_POLICE |
| 227 | case TC_POLICE_SHOT: |
| 228 | kfree_skb(skb); |
| 229 | break; |
| 230 | #if 0 |
| 231 | case TC_POLICE_RECLASSIFY: |
| 232 | /* FIXME: what to do here ??? */ |
| 233 | #endif |
| 234 | #endif |
| 235 | case TC_POLICE_OK: |
| 236 | skb->tc_index = TC_H_MIN(res.classid); |
| 237 | break; |
| 238 | case TC_POLICE_UNSPEC: |
| 239 | /* fall through */ |
| 240 | default: |
| 241 | if (p->default_index != NO_DEFAULT_INDEX) |
| 242 | skb->tc_index = p->default_index; |
| 243 | break; |
| 244 | }; |
| 245 | } |
| 246 | if ( |
| 247 | #ifdef CONFIG_NET_CLS_POLICE |
| 248 | result == TC_POLICE_SHOT || |
| 249 | #endif |
| 250 | |
| 251 | ((ret = p->q->enqueue(skb,p->q)) != 0)) { |
| 252 | sch->qstats.drops++; |
| 253 | return ret; |
| 254 | } |
| 255 | sch->bstats.bytes += skb->len; |
| 256 | sch->bstats.packets++; |
| 257 | sch->q.qlen++; |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | |
| 262 | static struct sk_buff *dsmark_dequeue(struct Qdisc *sch) |
| 263 | { |
| 264 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 265 | struct sk_buff *skb; |
| 266 | int index; |
| 267 | |
| 268 | D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p); |
| 269 | skb = p->q->ops->dequeue(p->q); |
| 270 | if (!skb) |
| 271 | return NULL; |
| 272 | sch->q.qlen--; |
| 273 | index = skb->tc_index & (p->indices-1); |
| 274 | D2PRINTK("index %d->%d\n",skb->tc_index,index); |
| 275 | switch (skb->protocol) { |
| 276 | case __constant_htons(ETH_P_IP): |
| 277 | ipv4_change_dsfield(skb->nh.iph, |
| 278 | p->mask[index],p->value[index]); |
| 279 | break; |
| 280 | case __constant_htons(ETH_P_IPV6): |
| 281 | ipv6_change_dsfield(skb->nh.ipv6h, |
| 282 | p->mask[index],p->value[index]); |
| 283 | break; |
| 284 | default: |
| 285 | /* |
| 286 | * Only complain if a change was actually attempted. |
| 287 | * This way, we can send non-IP traffic through dsmark |
| 288 | * and don't need yet another qdisc as a bypass. |
| 289 | */ |
| 290 | if (p->mask[index] != 0xff || p->value[index]) |
| 291 | printk(KERN_WARNING "dsmark_dequeue: " |
| 292 | "unsupported protocol %d\n", |
| 293 | htons(skb->protocol)); |
| 294 | break; |
| 295 | }; |
| 296 | return skb; |
| 297 | } |
| 298 | |
| 299 | |
| 300 | static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch) |
| 301 | { |
| 302 | int ret; |
| 303 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 304 | |
| 305 | D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p); |
| 306 | if ((ret = p->q->ops->requeue(skb, p->q)) == 0) { |
| 307 | sch->q.qlen++; |
| 308 | sch->qstats.requeues++; |
| 309 | return 0; |
| 310 | } |
| 311 | sch->qstats.drops++; |
| 312 | return ret; |
| 313 | } |
| 314 | |
| 315 | |
| 316 | static unsigned int dsmark_drop(struct Qdisc *sch) |
| 317 | { |
| 318 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 319 | unsigned int len; |
| 320 | |
| 321 | DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p); |
| 322 | if (!p->q->ops->drop) |
| 323 | return 0; |
| 324 | if (!(len = p->q->ops->drop(p->q))) |
| 325 | return 0; |
| 326 | sch->q.qlen--; |
| 327 | return len; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | static int dsmark_init(struct Qdisc *sch,struct rtattr *opt) |
| 332 | { |
| 333 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 334 | struct rtattr *tb[TCA_DSMARK_MAX]; |
| 335 | __u16 tmp; |
| 336 | |
| 337 | DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt); |
| 338 | if (!opt || |
| 339 | rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 || |
| 340 | !tb[TCA_DSMARK_INDICES-1] || |
| 341 | RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16)) |
| 342 | return -EINVAL; |
| 343 | p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]); |
| 344 | if (!p->indices) |
| 345 | return -EINVAL; |
| 346 | for (tmp = p->indices; tmp != 1; tmp >>= 1) { |
| 347 | if (tmp & 1) |
| 348 | return -EINVAL; |
| 349 | } |
| 350 | p->default_index = NO_DEFAULT_INDEX; |
| 351 | if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) { |
| 352 | if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16)) |
| 353 | return -EINVAL; |
| 354 | p->default_index = |
| 355 | *(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]); |
| 356 | } |
| 357 | p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1]; |
| 358 | p->mask = kmalloc(p->indices*2,GFP_KERNEL); |
| 359 | if (!p->mask) |
| 360 | return -ENOMEM; |
| 361 | p->value = p->mask+p->indices; |
| 362 | memset(p->mask,0xff,p->indices); |
| 363 | memset(p->value,0,p->indices); |
| 364 | if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops))) |
| 365 | p->q = &noop_qdisc; |
| 366 | DPRINTK("dsmark_init: qdisc %p\n",&p->q); |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | |
| 371 | static void dsmark_reset(struct Qdisc *sch) |
| 372 | { |
| 373 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 374 | |
| 375 | DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p); |
| 376 | qdisc_reset(p->q); |
| 377 | sch->q.qlen = 0; |
| 378 | } |
| 379 | |
| 380 | |
| 381 | static void dsmark_destroy(struct Qdisc *sch) |
| 382 | { |
| 383 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 384 | struct tcf_proto *tp; |
| 385 | |
| 386 | DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p); |
| 387 | while (p->filter_list) { |
| 388 | tp = p->filter_list; |
| 389 | p->filter_list = tp->next; |
| 390 | tcf_destroy(tp); |
| 391 | } |
| 392 | qdisc_destroy(p->q); |
| 393 | kfree(p->mask); |
| 394 | } |
| 395 | |
| 396 | |
| 397 | static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl, |
| 398 | struct sk_buff *skb, struct tcmsg *tcm) |
| 399 | { |
| 400 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 401 | unsigned char *b = skb->tail; |
| 402 | struct rtattr *rta; |
| 403 | |
| 404 | DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl); |
| 405 | if (!cl || cl > p->indices) |
| 406 | return -EINVAL; |
| 407 | tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1); |
| 408 | rta = (struct rtattr *) b; |
| 409 | RTA_PUT(skb,TCA_OPTIONS,0,NULL); |
| 410 | RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]); |
| 411 | RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]); |
| 412 | rta->rta_len = skb->tail-b; |
| 413 | return skb->len; |
| 414 | |
| 415 | rtattr_failure: |
| 416 | skb_trim(skb,b-skb->data); |
| 417 | return -1; |
| 418 | } |
| 419 | |
| 420 | static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 421 | { |
| 422 | struct dsmark_qdisc_data *p = PRIV(sch); |
| 423 | unsigned char *b = skb->tail; |
| 424 | struct rtattr *rta; |
| 425 | |
| 426 | rta = (struct rtattr *) b; |
| 427 | RTA_PUT(skb,TCA_OPTIONS,0,NULL); |
| 428 | RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices); |
| 429 | if (p->default_index != NO_DEFAULT_INDEX) { |
| 430 | __u16 tmp = p->default_index; |
| 431 | |
| 432 | RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp); |
| 433 | } |
| 434 | if (p->set_tc_index) |
| 435 | RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL); |
| 436 | rta->rta_len = skb->tail-b; |
| 437 | return skb->len; |
| 438 | |
| 439 | rtattr_failure: |
| 440 | skb_trim(skb,b-skb->data); |
| 441 | return -1; |
| 442 | } |
| 443 | |
| 444 | static struct Qdisc_class_ops dsmark_class_ops = { |
| 445 | .graft = dsmark_graft, |
| 446 | .leaf = dsmark_leaf, |
| 447 | .get = dsmark_get, |
| 448 | .put = dsmark_put, |
| 449 | .change = dsmark_change, |
| 450 | .delete = dsmark_delete, |
| 451 | .walk = dsmark_walk, |
| 452 | .tcf_chain = dsmark_find_tcf, |
| 453 | .bind_tcf = dsmark_bind_filter, |
| 454 | .unbind_tcf = dsmark_put, |
| 455 | .dump = dsmark_dump_class, |
| 456 | }; |
| 457 | |
| 458 | static struct Qdisc_ops dsmark_qdisc_ops = { |
| 459 | .next = NULL, |
| 460 | .cl_ops = &dsmark_class_ops, |
| 461 | .id = "dsmark", |
| 462 | .priv_size = sizeof(struct dsmark_qdisc_data), |
| 463 | .enqueue = dsmark_enqueue, |
| 464 | .dequeue = dsmark_dequeue, |
| 465 | .requeue = dsmark_requeue, |
| 466 | .drop = dsmark_drop, |
| 467 | .init = dsmark_init, |
| 468 | .reset = dsmark_reset, |
| 469 | .destroy = dsmark_destroy, |
| 470 | .change = NULL, |
| 471 | .dump = dsmark_dump, |
| 472 | .owner = THIS_MODULE, |
| 473 | }; |
| 474 | |
| 475 | static int __init dsmark_module_init(void) |
| 476 | { |
| 477 | return register_qdisc(&dsmark_qdisc_ops); |
| 478 | } |
| 479 | static void __exit dsmark_module_exit(void) |
| 480 | { |
| 481 | unregister_qdisc(&dsmark_qdisc_ops); |
| 482 | } |
| 483 | module_init(dsmark_module_init) |
| 484 | module_exit(dsmark_module_exit) |
| 485 | MODULE_LICENSE("GPL"); |