Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */ |
| 2 | |
| 3 | /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ |
| 4 | |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/module.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/string.h> |
| 9 | #include <linux/errno.h> |
| 10 | #include <linux/skbuff.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/atmdev.h> |
| 13 | #include <linux/atmclip.h> |
| 14 | #include <linux/netdevice.h> |
| 15 | #include <linux/rtnetlink.h> |
| 16 | #include <linux/file.h> /* for fput */ |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 17 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <net/pkt_sched.h> |
| 19 | #include <net/sock.h> |
| 20 | |
| 21 | |
| 22 | extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */ |
| 23 | |
| 24 | #if 0 /* control */ |
| 25 | #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) |
| 26 | #else |
| 27 | #define DPRINTK(format,args...) |
| 28 | #endif |
| 29 | |
| 30 | #if 0 /* data */ |
| 31 | #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args) |
| 32 | #else |
| 33 | #define D2PRINTK(format,args...) |
| 34 | #endif |
| 35 | |
| 36 | |
| 37 | /* |
| 38 | * The ATM queuing discipline provides a framework for invoking classifiers |
| 39 | * (aka "filters"), which in turn select classes of this queuing discipline. |
| 40 | * Each class maps the flow(s) it is handling to a given VC. Multiple classes |
| 41 | * may share the same VC. |
| 42 | * |
| 43 | * When creating a class, VCs are specified by passing the number of the open |
| 44 | * socket descriptor by which the calling process references the VC. The kernel |
| 45 | * keeps the VC open at least until all classes using it are removed. |
| 46 | * |
| 47 | * In this file, most functions are named atm_tc_* to avoid confusion with all |
| 48 | * the atm_* in net/atm. This naming convention differs from what's used in the |
| 49 | * rest of net/sched. |
| 50 | * |
| 51 | * Known bugs: |
| 52 | * - sometimes messes up the IP stack |
| 53 | * - any manipulations besides the few operations described in the README, are |
| 54 | * untested and likely to crash the system |
| 55 | * - should lock the flow while there is data in the queue (?) |
| 56 | */ |
| 57 | |
| 58 | |
| 59 | #define PRIV(sch) qdisc_priv(sch) |
| 60 | #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) |
| 61 | |
| 62 | |
| 63 | struct atm_flow_data { |
| 64 | struct Qdisc *q; /* FIFO, TBF, etc. */ |
| 65 | struct tcf_proto *filter_list; |
| 66 | struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
| 67 | void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */ |
| 68 | struct atm_qdisc_data *parent; /* parent qdisc */ |
| 69 | struct socket *sock; /* for closing */ |
| 70 | u32 classid; /* x:y type ID */ |
| 71 | int ref; /* reference count */ |
| 72 | struct gnet_stats_basic bstats; |
| 73 | struct gnet_stats_queue qstats; |
| 74 | spinlock_t *stats_lock; |
| 75 | struct atm_flow_data *next; |
| 76 | struct atm_flow_data *excess; /* flow for excess traffic; |
| 77 | NULL to set CLP instead */ |
| 78 | int hdr_len; |
| 79 | unsigned char hdr[0]; /* header data; MUST BE LAST */ |
| 80 | }; |
| 81 | |
| 82 | struct atm_qdisc_data { |
| 83 | struct atm_flow_data link; /* unclassified skbs go here */ |
| 84 | struct atm_flow_data *flows; /* NB: "link" is also on this |
| 85 | list */ |
| 86 | struct tasklet_struct task; /* requeue tasklet */ |
| 87 | }; |
| 88 | |
| 89 | |
| 90 | /* ------------------------- Class/flow operations ------------------------- */ |
| 91 | |
| 92 | |
| 93 | static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow) |
| 94 | { |
| 95 | struct atm_flow_data *walk; |
| 96 | |
| 97 | DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow); |
| 98 | for (walk = qdisc->flows; walk; walk = walk->next) |
| 99 | if (walk == flow) return 1; |
| 100 | DPRINTK("find_flow: not found\n"); |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch, |
| 106 | u32 classid) |
| 107 | { |
| 108 | struct atm_qdisc_data *p = PRIV(sch); |
| 109 | struct atm_flow_data *flow; |
| 110 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 111 | for (flow = p->flows; flow; flow = flow->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | if (flow->classid == classid) break; |
| 113 | return flow; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | static int atm_tc_graft(struct Qdisc *sch,unsigned long arg, |
| 118 | struct Qdisc *new,struct Qdisc **old) |
| 119 | { |
| 120 | struct atm_qdisc_data *p = PRIV(sch); |
| 121 | struct atm_flow_data *flow = (struct atm_flow_data *) arg; |
| 122 | |
| 123 | DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch, |
| 124 | p,flow,new,old); |
| 125 | if (!find_flow(p,flow)) return -EINVAL; |
| 126 | if (!new) new = &noop_qdisc; |
| 127 | *old = xchg(&flow->q,new); |
| 128 | if (*old) qdisc_reset(*old); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 129 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | |
| 133 | static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl) |
| 134 | { |
| 135 | struct atm_flow_data *flow = (struct atm_flow_data *) cl; |
| 136 | |
| 137 | DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow); |
| 138 | return flow ? flow->q : NULL; |
| 139 | } |
| 140 | |
| 141 | |
| 142 | static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid) |
| 143 | { |
| 144 | struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch); |
| 145 | struct atm_flow_data *flow; |
| 146 | |
| 147 | DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid); |
| 148 | flow = lookup_flow(sch,classid); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 149 | if (flow) flow->ref++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | DPRINTK("atm_tc_get: flow %p\n",flow); |
| 151 | return (unsigned long) flow; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
| 156 | unsigned long parent, u32 classid) |
| 157 | { |
| 158 | return atm_tc_get(sch,classid); |
| 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* |
| 162 | * atm_tc_put handles all destructions, including the ones that are explicitly |
| 163 | * requested (atm_tc_destroy, etc.). The assumption here is that we never drop |
| 164 | * anything that still seems to be in use. |
| 165 | */ |
| 166 | |
| 167 | static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
| 168 | { |
| 169 | struct atm_qdisc_data *p = PRIV(sch); |
| 170 | struct atm_flow_data *flow = (struct atm_flow_data *) cl; |
| 171 | struct atm_flow_data **prev; |
| 172 | |
| 173 | DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow); |
| 174 | if (--flow->ref) return; |
| 175 | DPRINTK("atm_tc_put: destroying\n"); |
| 176 | for (prev = &p->flows; *prev; prev = &(*prev)->next) |
| 177 | if (*prev == flow) break; |
| 178 | if (!*prev) { |
| 179 | printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow); |
| 180 | return; |
| 181 | } |
| 182 | *prev = flow->next; |
| 183 | DPRINTK("atm_tc_put: qdisc %p\n",flow->q); |
| 184 | qdisc_destroy(flow->q); |
Patrick McHardy | a48b5a6 | 2007-03-23 11:29:43 -0700 | [diff] [blame] | 185 | tcf_destroy_chain(flow->filter_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (flow->sock) { |
| 187 | DPRINTK("atm_tc_put: f_count %d\n", |
| 188 | file_count(flow->sock->file)); |
| 189 | flow->vcc->pop = flow->old_pop; |
| 190 | sockfd_put(flow->sock); |
| 191 | } |
| 192 | if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess); |
| 193 | if (flow != &p->link) kfree(flow); |
| 194 | /* |
| 195 | * If flow == &p->link, the qdisc no longer works at this point and |
| 196 | * needs to be removed. (By the caller of atm_tc_put.) |
| 197 | */ |
| 198 | } |
| 199 | |
| 200 | |
| 201 | static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb) |
| 202 | { |
| 203 | struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; |
| 204 | |
| 205 | D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p); |
| 206 | VCC2FLOW(vcc)->old_pop(vcc,skb); |
| 207 | tasklet_schedule(&p->task); |
| 208 | } |
| 209 | |
| 210 | static const u8 llc_oui_ip[] = { |
| 211 | 0xaa, /* DSAP: non-ISO */ |
| 212 | 0xaa, /* SSAP: non-ISO */ |
| 213 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ |
| 214 | 0x00, /* OUI: EtherType */ |
| 215 | 0x00, 0x00, |
| 216 | 0x08, 0x00 }; /* Ethertype IP (0800) */ |
| 217 | |
| 218 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
| 219 | struct rtattr **tca, unsigned long *arg) |
| 220 | { |
| 221 | struct atm_qdisc_data *p = PRIV(sch); |
| 222 | struct atm_flow_data *flow = (struct atm_flow_data *) *arg; |
| 223 | struct atm_flow_data *excess = NULL; |
| 224 | struct rtattr *opt = tca[TCA_OPTIONS-1]; |
| 225 | struct rtattr *tb[TCA_ATM_MAX]; |
| 226 | struct socket *sock; |
| 227 | int fd,error,hdr_len; |
| 228 | void *hdr; |
| 229 | |
| 230 | DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
| 231 | "flow %p,opt %p)\n",sch,p,classid,parent,flow,opt); |
| 232 | /* |
| 233 | * The concept of parents doesn't apply for this qdisc. |
| 234 | */ |
| 235 | if (parent && parent != TC_H_ROOT && parent != sch->handle) |
| 236 | return -EINVAL; |
| 237 | /* |
| 238 | * ATM classes cannot be changed. In order to change properties of the |
| 239 | * ATM connection, that socket needs to be modified directly (via the |
| 240 | * native ATM API. In order to send a flow to a different VC, the old |
| 241 | * class needs to be removed and a new one added. (This may be changed |
| 242 | * later.) |
| 243 | */ |
| 244 | if (flow) return -EBUSY; |
| 245 | if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt)) |
| 246 | return -EINVAL; |
| 247 | if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd)) |
| 248 | return -EINVAL; |
| 249 | fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]); |
| 250 | DPRINTK("atm_tc_change: fd %d\n",fd); |
| 251 | if (tb[TCA_ATM_HDR-1]) { |
| 252 | hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]); |
| 253 | hdr = RTA_DATA(tb[TCA_ATM_HDR-1]); |
| 254 | } |
| 255 | else { |
| 256 | hdr_len = RFC1483LLC_LEN; |
| 257 | hdr = NULL; /* default LLC/SNAP for IP */ |
| 258 | } |
| 259 | if (!tb[TCA_ATM_EXCESS-1]) excess = NULL; |
| 260 | else { |
| 261 | if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32)) |
| 262 | return -EINVAL; |
| 263 | excess = (struct atm_flow_data *) atm_tc_get(sch, |
| 264 | *(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1])); |
| 265 | if (!excess) return -ENOENT; |
| 266 | } |
| 267 | DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
| 268 | opt->rta_type,RTA_PAYLOAD(opt),hdr_len); |
| 269 | if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */ |
| 270 | DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file)); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 271 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | error = -EPROTOTYPE; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 273 | goto err_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | } |
| 275 | /* @@@ should check if the socket is really operational or we'll crash |
| 276 | on vcc->send */ |
| 277 | if (classid) { |
| 278 | if (TC_H_MAJ(classid ^ sch->handle)) { |
| 279 | DPRINTK("atm_tc_change: classid mismatch\n"); |
| 280 | error = -EINVAL; |
| 281 | goto err_out; |
| 282 | } |
| 283 | if (find_flow(p,flow)) { |
| 284 | error = -EEXIST; |
| 285 | goto err_out; |
| 286 | } |
| 287 | } |
| 288 | else { |
| 289 | int i; |
| 290 | unsigned long cl; |
| 291 | |
| 292 | for (i = 1; i < 0x8000; i++) { |
| 293 | classid = TC_H_MAKE(sch->handle,0x8000 | i); |
| 294 | if (!(cl = atm_tc_get(sch,classid))) break; |
| 295 | atm_tc_put(sch,cl); |
| 296 | } |
| 297 | } |
| 298 | DPRINTK("atm_tc_change: new id %x\n",classid); |
| 299 | flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL); |
| 300 | DPRINTK("atm_tc_change: flow %p\n",flow); |
| 301 | if (!flow) { |
| 302 | error = -ENOBUFS; |
| 303 | goto err_out; |
| 304 | } |
| 305 | memset(flow,0,sizeof(*flow)); |
| 306 | flow->filter_list = NULL; |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 307 | if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,classid))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | flow->q = &noop_qdisc; |
| 309 | DPRINTK("atm_tc_change: qdisc %p\n",flow->q); |
| 310 | flow->sock = sock; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 311 | flow->vcc = ATM_SD(sock); /* speedup */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | flow->vcc->user_back = flow; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 313 | DPRINTK("atm_tc_change: vcc %p\n",flow->vcc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | flow->old_pop = flow->vcc->pop; |
| 315 | flow->parent = p; |
| 316 | flow->vcc->pop = sch_atm_pop; |
| 317 | flow->classid = classid; |
| 318 | flow->ref = 1; |
| 319 | flow->excess = excess; |
| 320 | flow->next = p->link.next; |
| 321 | p->link.next = flow; |
| 322 | flow->hdr_len = hdr_len; |
| 323 | if (hdr) |
| 324 | memcpy(flow->hdr,hdr,hdr_len); |
| 325 | else |
| 326 | memcpy(flow->hdr,llc_oui_ip,sizeof(llc_oui_ip)); |
| 327 | *arg = (unsigned long) flow; |
| 328 | return 0; |
| 329 | err_out: |
| 330 | if (excess) atm_tc_put(sch,(unsigned long) excess); |
| 331 | sockfd_put(sock); |
| 332 | return error; |
| 333 | } |
| 334 | |
| 335 | |
| 336 | static int atm_tc_delete(struct Qdisc *sch,unsigned long arg) |
| 337 | { |
| 338 | struct atm_qdisc_data *p = PRIV(sch); |
| 339 | struct atm_flow_data *flow = (struct atm_flow_data *) arg; |
| 340 | |
| 341 | DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow); |
| 342 | if (!find_flow(PRIV(sch),flow)) return -EINVAL; |
| 343 | if (flow->filter_list || flow == &p->link) return -EBUSY; |
| 344 | /* |
| 345 | * Reference count must be 2: one for "keepalive" (set at class |
| 346 | * creation), and one for the reference held when calling delete. |
| 347 | */ |
| 348 | if (flow->ref < 2) { |
| 349 | printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref); |
| 350 | return -EINVAL; |
| 351 | } |
| 352 | if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/ |
| 353 | atm_tc_put(sch,arg); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | |
| 358 | static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker) |
| 359 | { |
| 360 | struct atm_qdisc_data *p = PRIV(sch); |
| 361 | struct atm_flow_data *flow; |
| 362 | |
| 363 | DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker); |
| 364 | if (walker->stop) return; |
| 365 | for (flow = p->flows; flow; flow = flow->next) { |
| 366 | if (walker->count >= walker->skip) |
| 367 | if (walker->fn(sch,(unsigned long) flow,walker) < 0) { |
| 368 | walker->stop = 1; |
| 369 | break; |
| 370 | } |
| 371 | walker->count++; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | |
| 376 | static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl) |
| 377 | { |
| 378 | struct atm_qdisc_data *p = PRIV(sch); |
| 379 | struct atm_flow_data *flow = (struct atm_flow_data *) cl; |
| 380 | |
| 381 | DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 382 | return flow ? &flow->filter_list : &p->link.filter_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | |
| 386 | /* --------------------------- Qdisc operations ---------------------------- */ |
| 387 | |
| 388 | |
| 389 | static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch) |
| 390 | { |
| 391 | struct atm_qdisc_data *p = PRIV(sch); |
| 392 | struct atm_flow_data *flow = NULL ; /* @@@ */ |
| 393 | struct tcf_result res; |
| 394 | int result; |
| 395 | int ret = NET_XMIT_POLICED; |
| 396 | |
| 397 | D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p); |
| 398 | result = TC_POLICE_OK; /* be nice to gcc */ |
| 399 | if (TC_H_MAJ(skb->priority) != sch->handle || |
| 400 | !(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority))) |
| 401 | for (flow = p->flows; flow; flow = flow->next) |
| 402 | if (flow->filter_list) { |
| 403 | result = tc_classify(skb,flow->filter_list, |
| 404 | &res); |
| 405 | if (result < 0) continue; |
| 406 | flow = (struct atm_flow_data *) res.class; |
| 407 | if (!flow) flow = lookup_flow(sch,res.classid); |
| 408 | break; |
| 409 | } |
| 410 | if (!flow) flow = &p->link; |
| 411 | else { |
| 412 | if (flow->vcc) |
| 413 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; |
| 414 | /*@@@ looks good ... but it's not supposed to work :-)*/ |
| 415 | #ifdef CONFIG_NET_CLS_POLICE |
| 416 | switch (result) { |
| 417 | case TC_POLICE_SHOT: |
| 418 | kfree_skb(skb); |
| 419 | break; |
| 420 | case TC_POLICE_RECLASSIFY: |
| 421 | if (flow->excess) flow = flow->excess; |
| 422 | else { |
| 423 | ATM_SKB(skb)->atm_options |= |
| 424 | ATM_ATMOPT_CLP; |
| 425 | break; |
| 426 | } |
| 427 | /* fall through */ |
| 428 | case TC_POLICE_OK: |
| 429 | /* fall through */ |
| 430 | default: |
| 431 | break; |
| 432 | } |
| 433 | #endif |
| 434 | } |
| 435 | if ( |
| 436 | #ifdef CONFIG_NET_CLS_POLICE |
| 437 | result == TC_POLICE_SHOT || |
| 438 | #endif |
| 439 | (ret = flow->q->enqueue(skb,flow->q)) != 0) { |
| 440 | sch->qstats.drops++; |
| 441 | if (flow) flow->qstats.drops++; |
| 442 | return ret; |
| 443 | } |
| 444 | sch->bstats.bytes += skb->len; |
| 445 | sch->bstats.packets++; |
| 446 | flow->bstats.bytes += skb->len; |
| 447 | flow->bstats.packets++; |
| 448 | /* |
| 449 | * Okay, this may seem weird. We pretend we've dropped the packet if |
| 450 | * it goes via ATM. The reason for this is that the outer qdisc |
| 451 | * expects to be able to q->dequeue the packet later on if we return |
| 452 | * success at this place. Also, sch->q.qdisc needs to reflect whether |
| 453 | * there is a packet egligible for dequeuing or not. Note that the |
| 454 | * statistics of the outer qdisc are necessarily wrong because of all |
| 455 | * this. There's currently no correct solution for this. |
| 456 | */ |
| 457 | if (flow == &p->link) { |
| 458 | sch->q.qlen++; |
| 459 | return 0; |
| 460 | } |
| 461 | tasklet_schedule(&p->task); |
| 462 | return NET_XMIT_BYPASS; |
| 463 | } |
| 464 | |
| 465 | |
| 466 | /* |
| 467 | * Dequeue packets and send them over ATM. Note that we quite deliberately |
| 468 | * avoid checking net_device's flow control here, simply because sch_atm |
| 469 | * uses its own channels, which have nothing to do with any CLIP/LANE/or |
| 470 | * non-ATM interfaces. |
| 471 | */ |
| 472 | |
| 473 | |
| 474 | static void sch_atm_dequeue(unsigned long data) |
| 475 | { |
| 476 | struct Qdisc *sch = (struct Qdisc *) data; |
| 477 | struct atm_qdisc_data *p = PRIV(sch); |
| 478 | struct atm_flow_data *flow; |
| 479 | struct sk_buff *skb; |
| 480 | |
| 481 | D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p); |
| 482 | for (flow = p->link.next; flow; flow = flow->next) |
| 483 | /* |
| 484 | * If traffic is properly shaped, this won't generate nasty |
| 485 | * little bursts. Otherwise, it may ... (but that's okay) |
| 486 | */ |
| 487 | while ((skb = flow->q->dequeue(flow->q))) { |
| 488 | if (!atm_may_send(flow->vcc,skb->truesize)) { |
| 489 | (void) flow->q->ops->requeue(skb,flow->q); |
| 490 | break; |
| 491 | } |
| 492 | D2PRINTK("atm_tc_dequeue: sending on class %p\n",flow); |
| 493 | /* remove any LL header somebody else has attached */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 494 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | if (skb_headroom(skb) < flow->hdr_len) { |
| 496 | struct sk_buff *new; |
| 497 | |
| 498 | new = skb_realloc_headroom(skb,flow->hdr_len); |
| 499 | dev_kfree_skb(skb); |
| 500 | if (!new) continue; |
| 501 | skb = new; |
| 502 | } |
| 503 | D2PRINTK("sch_atm_dequeue: ip %p, data %p\n", |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 504 | skb_network_header(skb), skb->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | ATM_SKB(skb)->vcc = flow->vcc; |
| 506 | memcpy(skb_push(skb,flow->hdr_len),flow->hdr, |
| 507 | flow->hdr_len); |
| 508 | atomic_add(skb->truesize, |
| 509 | &sk_atm(flow->vcc)->sk_wmem_alloc); |
| 510 | /* atm.atm_options are already set by atm_tc_enqueue */ |
| 511 | (void) flow->vcc->send(flow->vcc,skb); |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | |
| 516 | static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
| 517 | { |
| 518 | struct atm_qdisc_data *p = PRIV(sch); |
| 519 | struct sk_buff *skb; |
| 520 | |
| 521 | D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p); |
| 522 | tasklet_schedule(&p->task); |
| 523 | skb = p->link.q->dequeue(p->link.q); |
| 524 | if (skb) sch->q.qlen--; |
| 525 | return skb; |
| 526 | } |
| 527 | |
| 528 | |
| 529 | static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch) |
| 530 | { |
| 531 | struct atm_qdisc_data *p = PRIV(sch); |
| 532 | int ret; |
| 533 | |
| 534 | D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p); |
| 535 | ret = p->link.q->ops->requeue(skb,p->link.q); |
| 536 | if (!ret) { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 537 | sch->q.qlen++; |
| 538 | sch->qstats.requeues++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } else { |
| 540 | sch->qstats.drops++; |
| 541 | p->link.qstats.drops++; |
| 542 | } |
| 543 | return ret; |
| 544 | } |
| 545 | |
| 546 | |
| 547 | static unsigned int atm_tc_drop(struct Qdisc *sch) |
| 548 | { |
| 549 | struct atm_qdisc_data *p = PRIV(sch); |
| 550 | struct atm_flow_data *flow; |
| 551 | unsigned int len; |
| 552 | |
| 553 | DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p); |
| 554 | for (flow = p->flows; flow; flow = flow->next) |
| 555 | if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q))) |
| 556 | return len; |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | |
| 561 | static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt) |
| 562 | { |
| 563 | struct atm_qdisc_data *p = PRIV(sch); |
| 564 | |
| 565 | DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt); |
| 566 | p->flows = &p->link; |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 567 | if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops, |
| 568 | sch->handle))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | p->link.q = &noop_qdisc; |
| 570 | DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q); |
| 571 | p->link.filter_list = NULL; |
| 572 | p->link.vcc = NULL; |
| 573 | p->link.sock = NULL; |
| 574 | p->link.classid = sch->handle; |
| 575 | p->link.ref = 1; |
| 576 | p->link.next = NULL; |
| 577 | tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch); |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | |
| 582 | static void atm_tc_reset(struct Qdisc *sch) |
| 583 | { |
| 584 | struct atm_qdisc_data *p = PRIV(sch); |
| 585 | struct atm_flow_data *flow; |
| 586 | |
| 587 | DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p); |
| 588 | for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q); |
| 589 | sch->q.qlen = 0; |
| 590 | } |
| 591 | |
| 592 | |
| 593 | static void atm_tc_destroy(struct Qdisc *sch) |
| 594 | { |
| 595 | struct atm_qdisc_data *p = PRIV(sch); |
| 596 | struct atm_flow_data *flow; |
| 597 | |
| 598 | DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p); |
| 599 | /* races ? */ |
| 600 | while ((flow = p->flows)) { |
Patrick McHardy | a48b5a6 | 2007-03-23 11:29:43 -0700 | [diff] [blame] | 601 | tcf_destroy_chain(flow->filter_list); |
Patrick McHardy | b00b4bf | 2007-06-05 16:06:59 -0700 | [diff] [blame] | 602 | flow->filter_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | if (flow->ref > 1) |
| 604 | printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow, |
| 605 | flow->ref); |
| 606 | atm_tc_put(sch,(unsigned long) flow); |
| 607 | if (p->flows == flow) { |
| 608 | printk(KERN_ERR "atm_destroy: putting flow %p didn't " |
| 609 | "kill it\n",flow); |
| 610 | p->flows = flow->next; /* brute force */ |
| 611 | break; |
| 612 | } |
| 613 | } |
| 614 | tasklet_kill(&p->task); |
| 615 | } |
| 616 | |
| 617 | |
| 618 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
| 619 | struct sk_buff *skb, struct tcmsg *tcm) |
| 620 | { |
| 621 | struct atm_qdisc_data *p = PRIV(sch); |
| 622 | struct atm_flow_data *flow = (struct atm_flow_data *) cl; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 623 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | struct rtattr *rta; |
| 625 | |
| 626 | DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
| 627 | sch,p,flow,skb,tcm); |
| 628 | if (!find_flow(p,flow)) return -EINVAL; |
| 629 | tcm->tcm_handle = flow->classid; |
Patrick McHardy | cdc7f8e | 2006-03-20 19:01:06 -0800 | [diff] [blame] | 630 | tcm->tcm_info = flow->q->handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | rta = (struct rtattr *) b; |
| 632 | RTA_PUT(skb,TCA_OPTIONS,0,NULL); |
| 633 | RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr); |
| 634 | if (flow->vcc) { |
| 635 | struct sockaddr_atmpvc pvc; |
| 636 | int state; |
| 637 | |
| 638 | pvc.sap_family = AF_ATMPVC; |
| 639 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; |
| 640 | pvc.sap_addr.vpi = flow->vcc->vpi; |
| 641 | pvc.sap_addr.vci = flow->vcc->vci; |
| 642 | RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc); |
| 643 | state = ATM_VF2VS(flow->vcc->flags); |
| 644 | RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state); |
| 645 | } |
| 646 | if (flow->excess) |
| 647 | RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid); |
| 648 | else { |
| 649 | static u32 zero; |
| 650 | |
| 651 | RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero); |
| 652 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 653 | rta->rta_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | return skb->len; |
| 655 | |
| 656 | rtattr_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 657 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | return -1; |
| 659 | } |
| 660 | static int |
| 661 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, |
| 662 | struct gnet_dump *d) |
| 663 | { |
| 664 | struct atm_flow_data *flow = (struct atm_flow_data *) arg; |
| 665 | |
| 666 | flow->qstats.qlen = flow->q->q.qlen; |
| 667 | |
| 668 | if (gnet_stats_copy_basic(d, &flow->bstats) < 0 || |
| 669 | gnet_stats_copy_queue(d, &flow->qstats) < 0) |
| 670 | return -1; |
| 671 | |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 676 | { |
| 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | static struct Qdisc_class_ops atm_class_ops = { |
| 681 | .graft = atm_tc_graft, |
| 682 | .leaf = atm_tc_leaf, |
| 683 | .get = atm_tc_get, |
| 684 | .put = atm_tc_put, |
| 685 | .change = atm_tc_change, |
| 686 | .delete = atm_tc_delete, |
| 687 | .walk = atm_tc_walk, |
| 688 | .tcf_chain = atm_tc_find_tcf, |
| 689 | .bind_tcf = atm_tc_bind_filter, |
| 690 | .unbind_tcf = atm_tc_put, |
| 691 | .dump = atm_tc_dump_class, |
| 692 | .dump_stats = atm_tc_dump_class_stats, |
| 693 | }; |
| 694 | |
| 695 | static struct Qdisc_ops atm_qdisc_ops = { |
| 696 | .next = NULL, |
| 697 | .cl_ops = &atm_class_ops, |
| 698 | .id = "atm", |
| 699 | .priv_size = sizeof(struct atm_qdisc_data), |
| 700 | .enqueue = atm_tc_enqueue, |
| 701 | .dequeue = atm_tc_dequeue, |
| 702 | .requeue = atm_tc_requeue, |
| 703 | .drop = atm_tc_drop, |
| 704 | .init = atm_tc_init, |
| 705 | .reset = atm_tc_reset, |
| 706 | .destroy = atm_tc_destroy, |
| 707 | .change = NULL, |
| 708 | .dump = atm_tc_dump, |
| 709 | .owner = THIS_MODULE, |
| 710 | }; |
| 711 | |
| 712 | |
| 713 | static int __init atm_init(void) |
| 714 | { |
| 715 | return register_qdisc(&atm_qdisc_ops); |
| 716 | } |
| 717 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 718 | static void __exit atm_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
| 720 | unregister_qdisc(&atm_qdisc_ops); |
| 721 | } |
| 722 | |
| 723 | module_init(atm_init) |
| 724 | module_exit(atm_exit) |
| 725 | MODULE_LICENSE("GPL"); |