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Commit | Line | Data |
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1da177e4 LT |
1 | /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */ |
2 | ||
3 | /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ | |
4 | ||
1da177e4 LT |
5 | #include <linux/module.h> |
6 | #include <linux/init.h> | |
7 | #include <linux/string.h> | |
8 | #include <linux/errno.h> | |
9 | #include <linux/skbuff.h> | |
1da177e4 LT |
10 | #include <linux/atmdev.h> |
11 | #include <linux/atmclip.h> | |
1da177e4 | 12 | #include <linux/rtnetlink.h> |
b0188d4d | 13 | #include <linux/file.h> /* for fput */ |
dc5fc579 | 14 | #include <net/netlink.h> |
1da177e4 | 15 | #include <net/pkt_sched.h> |
1da177e4 | 16 | |
b0188d4d | 17 | extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */ |
1da177e4 LT |
18 | |
19 | #if 0 /* control */ | |
20 | #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) | |
21 | #else | |
22 | #define DPRINTK(format,args...) | |
23 | #endif | |
24 | ||
25 | #if 0 /* data */ | |
26 | #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args) | |
27 | #else | |
28 | #define D2PRINTK(format,args...) | |
29 | #endif | |
30 | ||
1da177e4 LT |
31 | /* |
32 | * The ATM queuing discipline provides a framework for invoking classifiers | |
33 | * (aka "filters"), which in turn select classes of this queuing discipline. | |
34 | * Each class maps the flow(s) it is handling to a given VC. Multiple classes | |
35 | * may share the same VC. | |
36 | * | |
37 | * When creating a class, VCs are specified by passing the number of the open | |
38 | * socket descriptor by which the calling process references the VC. The kernel | |
39 | * keeps the VC open at least until all classes using it are removed. | |
40 | * | |
41 | * In this file, most functions are named atm_tc_* to avoid confusion with all | |
42 | * the atm_* in net/atm. This naming convention differs from what's used in the | |
43 | * rest of net/sched. | |
44 | * | |
45 | * Known bugs: | |
46 | * - sometimes messes up the IP stack | |
47 | * - any manipulations besides the few operations described in the README, are | |
48 | * untested and likely to crash the system | |
49 | * - should lock the flow while there is data in the queue (?) | |
50 | */ | |
51 | ||
1da177e4 LT |
52 | #define PRIV(sch) qdisc_priv(sch) |
53 | #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) | |
54 | ||
1da177e4 | 55 | struct atm_flow_data { |
b0188d4d | 56 | struct Qdisc *q; /* FIFO, TBF, etc. */ |
1da177e4 | 57 | struct tcf_proto *filter_list; |
b0188d4d PM |
58 | struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
59 | void (*old_pop)(struct atm_vcc *vcc, | |
60 | struct sk_buff * skb); /* chaining */ | |
1da177e4 LT |
61 | struct atm_qdisc_data *parent; /* parent qdisc */ |
62 | struct socket *sock; /* for closing */ | |
63 | u32 classid; /* x:y type ID */ | |
64 | int ref; /* reference count */ | |
65 | struct gnet_stats_basic bstats; | |
66 | struct gnet_stats_queue qstats; | |
1da177e4 LT |
67 | struct atm_flow_data *next; |
68 | struct atm_flow_data *excess; /* flow for excess traffic; | |
69 | NULL to set CLP instead */ | |
70 | int hdr_len; | |
71 | unsigned char hdr[0]; /* header data; MUST BE LAST */ | |
72 | }; | |
73 | ||
74 | struct atm_qdisc_data { | |
75 | struct atm_flow_data link; /* unclassified skbs go here */ | |
76 | struct atm_flow_data *flows; /* NB: "link" is also on this | |
77 | list */ | |
78 | struct tasklet_struct task; /* requeue tasklet */ | |
79 | }; | |
80 | ||
1da177e4 LT |
81 | /* ------------------------- Class/flow operations ------------------------- */ |
82 | ||
b0188d4d | 83 | static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow) |
1da177e4 LT |
84 | { |
85 | struct atm_flow_data *walk; | |
86 | ||
b0188d4d | 87 | DPRINTK("find_flow(qdisc %p,flow %p)\n", qdisc, flow); |
1da177e4 | 88 | for (walk = qdisc->flows; walk; walk = walk->next) |
b0188d4d PM |
89 | if (walk == flow) |
90 | return 1; | |
1da177e4 LT |
91 | DPRINTK("find_flow: not found\n"); |
92 | return 0; | |
93 | } | |
94 | ||
b0188d4d | 95 | static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
1da177e4 LT |
96 | { |
97 | struct atm_qdisc_data *p = PRIV(sch); | |
98 | struct atm_flow_data *flow; | |
99 | ||
10297b99 | 100 | for (flow = p->flows; flow; flow = flow->next) |
b0188d4d PM |
101 | if (flow->classid == classid) |
102 | break; | |
1da177e4 LT |
103 | return flow; |
104 | } | |
105 | ||
b0188d4d PM |
106 | static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
107 | struct Qdisc *new, struct Qdisc **old) | |
1da177e4 LT |
108 | { |
109 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d PM |
110 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
111 | ||
112 | DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", | |
113 | sch, p, flow, new, old); | |
114 | if (!find_flow(p, flow)) | |
115 | return -EINVAL; | |
116 | if (!new) | |
117 | new = &noop_qdisc; | |
118 | *old = xchg(&flow->q, new); | |
119 | if (*old) | |
120 | qdisc_reset(*old); | |
10297b99 | 121 | return 0; |
1da177e4 LT |
122 | } |
123 | ||
b0188d4d | 124 | static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 125 | { |
b0188d4d | 126 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 127 | |
b0188d4d | 128 | DPRINTK("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
1da177e4 LT |
129 | return flow ? flow->q : NULL; |
130 | } | |
131 | ||
b0188d4d | 132 | static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid) |
1da177e4 | 133 | { |
b0188d4d | 134 | struct atm_qdisc_data *p __maybe_unused = PRIV(sch); |
1da177e4 LT |
135 | struct atm_flow_data *flow; |
136 | ||
b0188d4d PM |
137 | DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); |
138 | flow = lookup_flow(sch, classid); | |
139 | if (flow) | |
140 | flow->ref++; | |
141 | DPRINTK("atm_tc_get: flow %p\n", flow); | |
142 | return (unsigned long)flow; | |
1da177e4 LT |
143 | } |
144 | ||
1da177e4 | 145 | static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
b0188d4d | 146 | unsigned long parent, u32 classid) |
1da177e4 | 147 | { |
b0188d4d | 148 | return atm_tc_get(sch, classid); |
1da177e4 LT |
149 | } |
150 | ||
1da177e4 LT |
151 | /* |
152 | * atm_tc_put handles all destructions, including the ones that are explicitly | |
153 | * requested (atm_tc_destroy, etc.). The assumption here is that we never drop | |
154 | * anything that still seems to be in use. | |
155 | */ | |
1da177e4 LT |
156 | static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
157 | { | |
158 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d | 159 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 LT |
160 | struct atm_flow_data **prev; |
161 | ||
b0188d4d PM |
162 | DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
163 | if (--flow->ref) | |
164 | return; | |
1da177e4 LT |
165 | DPRINTK("atm_tc_put: destroying\n"); |
166 | for (prev = &p->flows; *prev; prev = &(*prev)->next) | |
b0188d4d PM |
167 | if (*prev == flow) |
168 | break; | |
1da177e4 | 169 | if (!*prev) { |
b0188d4d | 170 | printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow); |
1da177e4 LT |
171 | return; |
172 | } | |
173 | *prev = flow->next; | |
b0188d4d | 174 | DPRINTK("atm_tc_put: qdisc %p\n", flow->q); |
1da177e4 | 175 | qdisc_destroy(flow->q); |
a48b5a61 | 176 | tcf_destroy_chain(flow->filter_list); |
1da177e4 LT |
177 | if (flow->sock) { |
178 | DPRINTK("atm_tc_put: f_count %d\n", | |
b0188d4d | 179 | file_count(flow->sock->file)); |
1da177e4 LT |
180 | flow->vcc->pop = flow->old_pop; |
181 | sockfd_put(flow->sock); | |
182 | } | |
b0188d4d PM |
183 | if (flow->excess) |
184 | atm_tc_put(sch, (unsigned long)flow->excess); | |
185 | if (flow != &p->link) | |
186 | kfree(flow); | |
1da177e4 LT |
187 | /* |
188 | * If flow == &p->link, the qdisc no longer works at this point and | |
189 | * needs to be removed. (By the caller of atm_tc_put.) | |
190 | */ | |
191 | } | |
192 | ||
b0188d4d | 193 | static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
194 | { |
195 | struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; | |
196 | ||
b0188d4d PM |
197 | D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
198 | VCC2FLOW(vcc)->old_pop(vcc, skb); | |
1da177e4 LT |
199 | tasklet_schedule(&p->task); |
200 | } | |
201 | ||
202 | static const u8 llc_oui_ip[] = { | |
b0188d4d PM |
203 | 0xaa, /* DSAP: non-ISO */ |
204 | 0xaa, /* SSAP: non-ISO */ | |
205 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
206 | 0x00, /* OUI: EtherType */ | |
1da177e4 | 207 | 0x00, 0x00, |
b0188d4d PM |
208 | 0x08, 0x00 |
209 | }; /* Ethertype IP (0800) */ | |
1da177e4 LT |
210 | |
211 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, | |
b0188d4d | 212 | struct rtattr **tca, unsigned long *arg) |
1da177e4 LT |
213 | { |
214 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d | 215 | struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
1da177e4 | 216 | struct atm_flow_data *excess = NULL; |
b0188d4d | 217 | struct rtattr *opt = tca[TCA_OPTIONS - 1]; |
1da177e4 LT |
218 | struct rtattr *tb[TCA_ATM_MAX]; |
219 | struct socket *sock; | |
b0188d4d | 220 | int fd, error, hdr_len; |
1da177e4 LT |
221 | void *hdr; |
222 | ||
223 | DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," | |
b0188d4d | 224 | "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
1da177e4 LT |
225 | /* |
226 | * The concept of parents doesn't apply for this qdisc. | |
227 | */ | |
228 | if (parent && parent != TC_H_ROOT && parent != sch->handle) | |
229 | return -EINVAL; | |
230 | /* | |
231 | * ATM classes cannot be changed. In order to change properties of the | |
232 | * ATM connection, that socket needs to be modified directly (via the | |
233 | * native ATM API. In order to send a flow to a different VC, the old | |
234 | * class needs to be removed and a new one added. (This may be changed | |
235 | * later.) | |
236 | */ | |
b0188d4d PM |
237 | if (flow) |
238 | return -EBUSY; | |
1da177e4 LT |
239 | if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt)) |
240 | return -EINVAL; | |
b0188d4d | 241 | if (!tb[TCA_ATM_FD - 1] || RTA_PAYLOAD(tb[TCA_ATM_FD - 1]) < sizeof(fd)) |
1da177e4 | 242 | return -EINVAL; |
b0188d4d PM |
243 | fd = *(int *)RTA_DATA(tb[TCA_ATM_FD - 1]); |
244 | DPRINTK("atm_tc_change: fd %d\n", fd); | |
245 | if (tb[TCA_ATM_HDR - 1]) { | |
246 | hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR - 1]); | |
247 | hdr = RTA_DATA(tb[TCA_ATM_HDR - 1]); | |
248 | } else { | |
1da177e4 | 249 | hdr_len = RFC1483LLC_LEN; |
b0188d4d | 250 | hdr = NULL; /* default LLC/SNAP for IP */ |
1da177e4 | 251 | } |
b0188d4d PM |
252 | if (!tb[TCA_ATM_EXCESS - 1]) |
253 | excess = NULL; | |
1da177e4 | 254 | else { |
b0188d4d | 255 | if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS - 1]) != sizeof(u32)) |
1da177e4 | 256 | return -EINVAL; |
b0188d4d PM |
257 | excess = (struct atm_flow_data *) |
258 | atm_tc_get(sch, *(u32 *)RTA_DATA(tb[TCA_ATM_EXCESS - 1])); | |
259 | if (!excess) | |
260 | return -ENOENT; | |
1da177e4 LT |
261 | } |
262 | DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n", | |
b0188d4d PM |
263 | opt->rta_type, RTA_PAYLOAD(opt), hdr_len); |
264 | if (!(sock = sockfd_lookup(fd, &error))) | |
265 | return error; /* f_count++ */ | |
266 | DPRINTK("atm_tc_change: f_count %d\n", file_count(sock->file)); | |
10297b99 | 267 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
1da177e4 | 268 | error = -EPROTOTYPE; |
10297b99 | 269 | goto err_out; |
1da177e4 LT |
270 | } |
271 | /* @@@ should check if the socket is really operational or we'll crash | |
272 | on vcc->send */ | |
273 | if (classid) { | |
274 | if (TC_H_MAJ(classid ^ sch->handle)) { | |
275 | DPRINTK("atm_tc_change: classid mismatch\n"); | |
276 | error = -EINVAL; | |
277 | goto err_out; | |
278 | } | |
b0188d4d | 279 | if (find_flow(p, flow)) { |
1da177e4 LT |
280 | error = -EEXIST; |
281 | goto err_out; | |
282 | } | |
b0188d4d | 283 | } else { |
1da177e4 LT |
284 | int i; |
285 | unsigned long cl; | |
286 | ||
287 | for (i = 1; i < 0x8000; i++) { | |
b0188d4d PM |
288 | classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
289 | if (!(cl = atm_tc_get(sch, classid))) | |
290 | break; | |
291 | atm_tc_put(sch, cl); | |
1da177e4 LT |
292 | } |
293 | } | |
b0188d4d | 294 | DPRINTK("atm_tc_change: new id %x\n", classid); |
782f7956 | 295 | flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
b0188d4d | 296 | DPRINTK("atm_tc_change: flow %p\n", flow); |
1da177e4 LT |
297 | if (!flow) { |
298 | error = -ENOBUFS; | |
299 | goto err_out; | |
300 | } | |
1da177e4 | 301 | flow->filter_list = NULL; |
b0188d4d | 302 | if (!(flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid))) |
1da177e4 | 303 | flow->q = &noop_qdisc; |
b0188d4d | 304 | DPRINTK("atm_tc_change: qdisc %p\n", flow->q); |
1da177e4 | 305 | flow->sock = sock; |
b0188d4d | 306 | flow->vcc = ATM_SD(sock); /* speedup */ |
1da177e4 | 307 | flow->vcc->user_back = flow; |
b0188d4d | 308 | DPRINTK("atm_tc_change: vcc %p\n", flow->vcc); |
1da177e4 LT |
309 | flow->old_pop = flow->vcc->pop; |
310 | flow->parent = p; | |
311 | flow->vcc->pop = sch_atm_pop; | |
312 | flow->classid = classid; | |
313 | flow->ref = 1; | |
314 | flow->excess = excess; | |
315 | flow->next = p->link.next; | |
316 | p->link.next = flow; | |
317 | flow->hdr_len = hdr_len; | |
318 | if (hdr) | |
b0188d4d | 319 | memcpy(flow->hdr, hdr, hdr_len); |
1da177e4 | 320 | else |
b0188d4d PM |
321 | memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
322 | *arg = (unsigned long)flow; | |
1da177e4 LT |
323 | return 0; |
324 | err_out: | |
b0188d4d PM |
325 | if (excess) |
326 | atm_tc_put(sch, (unsigned long)excess); | |
1da177e4 LT |
327 | sockfd_put(sock); |
328 | return error; | |
329 | } | |
330 | ||
b0188d4d | 331 | static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
1da177e4 LT |
332 | { |
333 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d | 334 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 335 | |
b0188d4d PM |
336 | DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
337 | if (!find_flow(PRIV(sch), flow)) | |
338 | return -EINVAL; | |
339 | if (flow->filter_list || flow == &p->link) | |
340 | return -EBUSY; | |
1da177e4 LT |
341 | /* |
342 | * Reference count must be 2: one for "keepalive" (set at class | |
343 | * creation), and one for the reference held when calling delete. | |
344 | */ | |
345 | if (flow->ref < 2) { | |
b0188d4d | 346 | printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref); |
1da177e4 LT |
347 | return -EINVAL; |
348 | } | |
b0188d4d PM |
349 | if (flow->ref > 2) |
350 | return -EBUSY; /* catch references via excess, etc. */ | |
351 | atm_tc_put(sch, arg); | |
1da177e4 LT |
352 | return 0; |
353 | } | |
354 | ||
b0188d4d | 355 | static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 LT |
356 | { |
357 | struct atm_qdisc_data *p = PRIV(sch); | |
358 | struct atm_flow_data *flow; | |
359 | ||
b0188d4d PM |
360 | DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
361 | if (walker->stop) | |
362 | return; | |
1da177e4 LT |
363 | for (flow = p->flows; flow; flow = flow->next) { |
364 | if (walker->count >= walker->skip) | |
b0188d4d | 365 | if (walker->fn(sch, (unsigned long)flow, walker) < 0) { |
1da177e4 LT |
366 | walker->stop = 1; |
367 | break; | |
368 | } | |
369 | walker->count++; | |
370 | } | |
371 | } | |
372 | ||
b0188d4d | 373 | static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl) |
1da177e4 LT |
374 | { |
375 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d | 376 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 377 | |
b0188d4d | 378 | DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
10297b99 | 379 | return flow ? &flow->filter_list : &p->link.filter_list; |
1da177e4 LT |
380 | } |
381 | ||
1da177e4 LT |
382 | /* --------------------------- Qdisc operations ---------------------------- */ |
383 | ||
b0188d4d | 384 | static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 LT |
385 | { |
386 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d | 387 | struct atm_flow_data *flow = NULL; /* @@@ */ |
1da177e4 LT |
388 | struct tcf_result res; |
389 | int result; | |
390 | int ret = NET_XMIT_POLICED; | |
391 | ||
b0188d4d PM |
392 | D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
393 | result = TC_POLICE_OK; /* be nice to gcc */ | |
1da177e4 | 394 | if (TC_H_MAJ(skb->priority) != sch->handle || |
b0188d4d | 395 | !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) |
1da177e4 LT |
396 | for (flow = p->flows; flow; flow = flow->next) |
397 | if (flow->filter_list) { | |
73ca4918 PM |
398 | result = tc_classify_compat(skb, |
399 | flow->filter_list, | |
400 | &res); | |
b0188d4d PM |
401 | if (result < 0) |
402 | continue; | |
403 | flow = (struct atm_flow_data *)res.class; | |
404 | if (!flow) | |
405 | flow = lookup_flow(sch, res.classid); | |
1da177e4 LT |
406 | break; |
407 | } | |
b0188d4d PM |
408 | if (!flow) |
409 | flow = &p->link; | |
1da177e4 LT |
410 | else { |
411 | if (flow->vcc) | |
412 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; | |
b0188d4d | 413 | /*@@@ looks good ... but it's not supposed to work :-) */ |
92100804 PM |
414 | #ifdef CONFIG_NET_CLS_ACT |
415 | switch (result) { | |
416 | case TC_ACT_QUEUED: | |
417 | case TC_ACT_STOLEN: | |
418 | kfree_skb(skb); | |
419 | return NET_XMIT_SUCCESS; | |
420 | case TC_ACT_SHOT: | |
421 | kfree_skb(skb); | |
422 | goto drop; | |
73ca4918 PM |
423 | case TC_POLICE_RECLASSIFY: |
424 | if (flow->excess) | |
425 | flow = flow->excess; | |
426 | else | |
427 | ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; | |
428 | break; | |
92100804 | 429 | } |
1da177e4 LT |
430 | #endif |
431 | } | |
c3bc7cff | 432 | |
92100804 PM |
433 | if ((ret = flow->q->enqueue(skb, flow->q)) != 0) { |
434 | drop: __maybe_unused | |
1da177e4 | 435 | sch->qstats.drops++; |
b0188d4d PM |
436 | if (flow) |
437 | flow->qstats.drops++; | |
1da177e4 LT |
438 | return ret; |
439 | } | |
440 | sch->bstats.bytes += skb->len; | |
441 | sch->bstats.packets++; | |
442 | flow->bstats.bytes += skb->len; | |
443 | flow->bstats.packets++; | |
444 | /* | |
445 | * Okay, this may seem weird. We pretend we've dropped the packet if | |
446 | * it goes via ATM. The reason for this is that the outer qdisc | |
447 | * expects to be able to q->dequeue the packet later on if we return | |
448 | * success at this place. Also, sch->q.qdisc needs to reflect whether | |
449 | * there is a packet egligible for dequeuing or not. Note that the | |
450 | * statistics of the outer qdisc are necessarily wrong because of all | |
451 | * this. There's currently no correct solution for this. | |
452 | */ | |
453 | if (flow == &p->link) { | |
454 | sch->q.qlen++; | |
455 | return 0; | |
456 | } | |
457 | tasklet_schedule(&p->task); | |
458 | return NET_XMIT_BYPASS; | |
459 | } | |
460 | ||
1da177e4 LT |
461 | /* |
462 | * Dequeue packets and send them over ATM. Note that we quite deliberately | |
463 | * avoid checking net_device's flow control here, simply because sch_atm | |
464 | * uses its own channels, which have nothing to do with any CLIP/LANE/or | |
465 | * non-ATM interfaces. | |
466 | */ | |
467 | ||
1da177e4 LT |
468 | static void sch_atm_dequeue(unsigned long data) |
469 | { | |
b0188d4d | 470 | struct Qdisc *sch = (struct Qdisc *)data; |
1da177e4 LT |
471 | struct atm_qdisc_data *p = PRIV(sch); |
472 | struct atm_flow_data *flow; | |
473 | struct sk_buff *skb; | |
474 | ||
b0188d4d | 475 | D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
476 | for (flow = p->link.next; flow; flow = flow->next) |
477 | /* | |
478 | * If traffic is properly shaped, this won't generate nasty | |
479 | * little bursts. Otherwise, it may ... (but that's okay) | |
480 | */ | |
481 | while ((skb = flow->q->dequeue(flow->q))) { | |
b0188d4d PM |
482 | if (!atm_may_send(flow->vcc, skb->truesize)) { |
483 | (void)flow->q->ops->requeue(skb, flow->q); | |
1da177e4 LT |
484 | break; |
485 | } | |
b0188d4d | 486 | D2PRINTK("atm_tc_dequeue: sending on class %p\n", flow); |
1da177e4 | 487 | /* remove any LL header somebody else has attached */ |
eddc9ec5 | 488 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
489 | if (skb_headroom(skb) < flow->hdr_len) { |
490 | struct sk_buff *new; | |
491 | ||
b0188d4d | 492 | new = skb_realloc_headroom(skb, flow->hdr_len); |
1da177e4 | 493 | dev_kfree_skb(skb); |
b0188d4d PM |
494 | if (!new) |
495 | continue; | |
1da177e4 LT |
496 | skb = new; |
497 | } | |
498 | D2PRINTK("sch_atm_dequeue: ip %p, data %p\n", | |
eddc9ec5 | 499 | skb_network_header(skb), skb->data); |
1da177e4 | 500 | ATM_SKB(skb)->vcc = flow->vcc; |
b0188d4d PM |
501 | memcpy(skb_push(skb, flow->hdr_len), flow->hdr, |
502 | flow->hdr_len); | |
1da177e4 LT |
503 | atomic_add(skb->truesize, |
504 | &sk_atm(flow->vcc)->sk_wmem_alloc); | |
505 | /* atm.atm_options are already set by atm_tc_enqueue */ | |
b0188d4d | 506 | flow->vcc->send(flow->vcc, skb); |
1da177e4 LT |
507 | } |
508 | } | |
509 | ||
1da177e4 LT |
510 | static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
511 | { | |
512 | struct atm_qdisc_data *p = PRIV(sch); | |
513 | struct sk_buff *skb; | |
514 | ||
b0188d4d | 515 | D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
516 | tasklet_schedule(&p->task); |
517 | skb = p->link.q->dequeue(p->link.q); | |
b0188d4d PM |
518 | if (skb) |
519 | sch->q.qlen--; | |
1da177e4 LT |
520 | return skb; |
521 | } | |
522 | ||
b0188d4d | 523 | static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 LT |
524 | { |
525 | struct atm_qdisc_data *p = PRIV(sch); | |
526 | int ret; | |
527 | ||
b0188d4d PM |
528 | D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
529 | ret = p->link.q->ops->requeue(skb, p->link.q); | |
1da177e4 | 530 | if (!ret) { |
b0188d4d PM |
531 | sch->q.qlen++; |
532 | sch->qstats.requeues++; | |
533 | } else { | |
1da177e4 LT |
534 | sch->qstats.drops++; |
535 | p->link.qstats.drops++; | |
536 | } | |
537 | return ret; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | static unsigned int atm_tc_drop(struct Qdisc *sch) |
541 | { | |
542 | struct atm_qdisc_data *p = PRIV(sch); | |
543 | struct atm_flow_data *flow; | |
544 | unsigned int len; | |
545 | ||
b0188d4d | 546 | DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
547 | for (flow = p->flows; flow; flow = flow->next) |
548 | if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q))) | |
549 | return len; | |
550 | return 0; | |
551 | } | |
552 | ||
b0188d4d | 553 | static int atm_tc_init(struct Qdisc *sch, struct rtattr *opt) |
1da177e4 LT |
554 | { |
555 | struct atm_qdisc_data *p = PRIV(sch); | |
556 | ||
b0188d4d | 557 | DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
1da177e4 | 558 | p->flows = &p->link; |
b0188d4d PM |
559 | if (!(p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
560 | sch->handle))) | |
1da177e4 | 561 | p->link.q = &noop_qdisc; |
b0188d4d | 562 | DPRINTK("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
1da177e4 LT |
563 | p->link.filter_list = NULL; |
564 | p->link.vcc = NULL; | |
565 | p->link.sock = NULL; | |
566 | p->link.classid = sch->handle; | |
567 | p->link.ref = 1; | |
568 | p->link.next = NULL; | |
b0188d4d | 569 | tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); |
1da177e4 LT |
570 | return 0; |
571 | } | |
572 | ||
1da177e4 LT |
573 | static void atm_tc_reset(struct Qdisc *sch) |
574 | { | |
575 | struct atm_qdisc_data *p = PRIV(sch); | |
576 | struct atm_flow_data *flow; | |
577 | ||
b0188d4d PM |
578 | DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
579 | for (flow = p->flows; flow; flow = flow->next) | |
580 | qdisc_reset(flow->q); | |
1da177e4 LT |
581 | sch->q.qlen = 0; |
582 | } | |
583 | ||
1da177e4 LT |
584 | static void atm_tc_destroy(struct Qdisc *sch) |
585 | { | |
586 | struct atm_qdisc_data *p = PRIV(sch); | |
587 | struct atm_flow_data *flow; | |
588 | ||
b0188d4d | 589 | DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
590 | /* races ? */ |
591 | while ((flow = p->flows)) { | |
a48b5a61 | 592 | tcf_destroy_chain(flow->filter_list); |
b00b4bf9 | 593 | flow->filter_list = NULL; |
1da177e4 | 594 | if (flow->ref > 1) |
b0188d4d PM |
595 | printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow, |
596 | flow->ref); | |
597 | atm_tc_put(sch, (unsigned long)flow); | |
1da177e4 LT |
598 | if (p->flows == flow) { |
599 | printk(KERN_ERR "atm_destroy: putting flow %p didn't " | |
b0188d4d PM |
600 | "kill it\n", flow); |
601 | p->flows = flow->next; /* brute force */ | |
1da177e4 LT |
602 | break; |
603 | } | |
604 | } | |
605 | tasklet_kill(&p->task); | |
606 | } | |
607 | ||
1da177e4 | 608 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
b0188d4d | 609 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 LT |
610 | { |
611 | struct atm_qdisc_data *p = PRIV(sch); | |
b0188d4d | 612 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
27a884dc | 613 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
614 | struct rtattr *rta; |
615 | ||
616 | DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", | |
b0188d4d PM |
617 | sch, p, flow, skb, tcm); |
618 | if (!find_flow(p, flow)) | |
619 | return -EINVAL; | |
1da177e4 | 620 | tcm->tcm_handle = flow->classid; |
cdc7f8e3 | 621 | tcm->tcm_info = flow->q->handle; |
b0188d4d PM |
622 | rta = (struct rtattr *)b; |
623 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
624 | RTA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr); | |
1da177e4 LT |
625 | if (flow->vcc) { |
626 | struct sockaddr_atmpvc pvc; | |
627 | int state; | |
628 | ||
629 | pvc.sap_family = AF_ATMPVC; | |
630 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; | |
631 | pvc.sap_addr.vpi = flow->vcc->vpi; | |
632 | pvc.sap_addr.vci = flow->vcc->vci; | |
b0188d4d | 633 | RTA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc); |
1da177e4 | 634 | state = ATM_VF2VS(flow->vcc->flags); |
b0188d4d | 635 | RTA_PUT(skb, TCA_ATM_STATE, sizeof(state), &state); |
1da177e4 LT |
636 | } |
637 | if (flow->excess) | |
b0188d4d | 638 | RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(u32), &flow->classid); |
1da177e4 LT |
639 | else { |
640 | static u32 zero; | |
641 | ||
b0188d4d | 642 | RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(zero), &zero); |
1da177e4 | 643 | } |
27a884dc | 644 | rta->rta_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
645 | return skb->len; |
646 | ||
647 | rtattr_failure: | |
dc5fc579 | 648 | nlmsg_trim(skb, b); |
1da177e4 LT |
649 | return -1; |
650 | } | |
651 | static int | |
652 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
b0188d4d | 653 | struct gnet_dump *d) |
1da177e4 | 654 | { |
b0188d4d | 655 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 LT |
656 | |
657 | flow->qstats.qlen = flow->q->q.qlen; | |
658 | ||
659 | if (gnet_stats_copy_basic(d, &flow->bstats) < 0 || | |
660 | gnet_stats_copy_queue(d, &flow->qstats) < 0) | |
661 | return -1; | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) | |
667 | { | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static struct Qdisc_class_ops atm_class_ops = { | |
b0188d4d PM |
672 | .graft = atm_tc_graft, |
673 | .leaf = atm_tc_leaf, | |
674 | .get = atm_tc_get, | |
675 | .put = atm_tc_put, | |
676 | .change = atm_tc_change, | |
677 | .delete = atm_tc_delete, | |
678 | .walk = atm_tc_walk, | |
679 | .tcf_chain = atm_tc_find_tcf, | |
680 | .bind_tcf = atm_tc_bind_filter, | |
681 | .unbind_tcf = atm_tc_put, | |
682 | .dump = atm_tc_dump_class, | |
683 | .dump_stats = atm_tc_dump_class_stats, | |
1da177e4 LT |
684 | }; |
685 | ||
686 | static struct Qdisc_ops atm_qdisc_ops = { | |
b0188d4d PM |
687 | .cl_ops = &atm_class_ops, |
688 | .id = "atm", | |
689 | .priv_size = sizeof(struct atm_qdisc_data), | |
690 | .enqueue = atm_tc_enqueue, | |
691 | .dequeue = atm_tc_dequeue, | |
692 | .requeue = atm_tc_requeue, | |
693 | .drop = atm_tc_drop, | |
694 | .init = atm_tc_init, | |
695 | .reset = atm_tc_reset, | |
696 | .destroy = atm_tc_destroy, | |
697 | .dump = atm_tc_dump, | |
698 | .owner = THIS_MODULE, | |
1da177e4 LT |
699 | }; |
700 | ||
1da177e4 LT |
701 | static int __init atm_init(void) |
702 | { | |
703 | return register_qdisc(&atm_qdisc_ops); | |
704 | } | |
705 | ||
10297b99 | 706 | static void __exit atm_exit(void) |
1da177e4 LT |
707 | { |
708 | unregister_qdisc(&atm_qdisc_ops); | |
709 | } | |
710 | ||
711 | module_init(atm_init) | |
712 | module_exit(atm_exit) | |
713 | MODULE_LICENSE("GPL"); |