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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 | 18 | |
1da177e4 LT |
19 | /* |
20 | * The ATM queuing discipline provides a framework for invoking classifiers | |
21 | * (aka "filters"), which in turn select classes of this queuing discipline. | |
22 | * Each class maps the flow(s) it is handling to a given VC. Multiple classes | |
23 | * may share the same VC. | |
24 | * | |
25 | * When creating a class, VCs are specified by passing the number of the open | |
26 | * socket descriptor by which the calling process references the VC. The kernel | |
27 | * keeps the VC open at least until all classes using it are removed. | |
28 | * | |
29 | * In this file, most functions are named atm_tc_* to avoid confusion with all | |
30 | * the atm_* in net/atm. This naming convention differs from what's used in the | |
31 | * rest of net/sched. | |
32 | * | |
33 | * Known bugs: | |
34 | * - sometimes messes up the IP stack | |
35 | * - any manipulations besides the few operations described in the README, are | |
36 | * untested and likely to crash the system | |
37 | * - should lock the flow while there is data in the queue (?) | |
38 | */ | |
39 | ||
1da177e4 LT |
40 | #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) |
41 | ||
1da177e4 | 42 | struct atm_flow_data { |
b0188d4d | 43 | struct Qdisc *q; /* FIFO, TBF, etc. */ |
1da177e4 | 44 | struct tcf_proto *filter_list; |
b0188d4d PM |
45 | struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
46 | void (*old_pop)(struct atm_vcc *vcc, | |
786a9036 | 47 | struct sk_buff *skb); /* chaining */ |
1da177e4 LT |
48 | struct atm_qdisc_data *parent; /* parent qdisc */ |
49 | struct socket *sock; /* for closing */ | |
50 | u32 classid; /* x:y type ID */ | |
51 | int ref; /* reference count */ | |
52 | struct gnet_stats_basic bstats; | |
53 | struct gnet_stats_queue qstats; | |
1da177e4 LT |
54 | struct atm_flow_data *next; |
55 | struct atm_flow_data *excess; /* flow for excess traffic; | |
56 | NULL to set CLP instead */ | |
57 | int hdr_len; | |
58 | unsigned char hdr[0]; /* header data; MUST BE LAST */ | |
59 | }; | |
60 | ||
61 | struct atm_qdisc_data { | |
62 | struct atm_flow_data link; /* unclassified skbs go here */ | |
63 | struct atm_flow_data *flows; /* NB: "link" is also on this | |
64 | list */ | |
65 | struct tasklet_struct task; /* requeue tasklet */ | |
66 | }; | |
67 | ||
1da177e4 LT |
68 | /* ------------------------- Class/flow operations ------------------------- */ |
69 | ||
b0188d4d | 70 | static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow) |
1da177e4 LT |
71 | { |
72 | struct atm_flow_data *walk; | |
73 | ||
786a9036 | 74 | pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow); |
1da177e4 | 75 | for (walk = qdisc->flows; walk; walk = walk->next) |
b0188d4d PM |
76 | if (walk == flow) |
77 | return 1; | |
786a9036 | 78 | pr_debug("find_flow: not found\n"); |
1da177e4 LT |
79 | return 0; |
80 | } | |
81 | ||
b0188d4d | 82 | static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
1da177e4 | 83 | { |
786a9036 | 84 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
85 | struct atm_flow_data *flow; |
86 | ||
10297b99 | 87 | for (flow = p->flows; flow; flow = flow->next) |
b0188d4d PM |
88 | if (flow->classid == classid) |
89 | break; | |
1da177e4 LT |
90 | return flow; |
91 | } | |
92 | ||
b0188d4d PM |
93 | static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
94 | struct Qdisc *new, struct Qdisc **old) | |
1da177e4 | 95 | { |
786a9036 | 96 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d PM |
97 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
98 | ||
786a9036 | 99 | pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", |
b0188d4d PM |
100 | sch, p, flow, new, old); |
101 | if (!find_flow(p, flow)) | |
102 | return -EINVAL; | |
103 | if (!new) | |
104 | new = &noop_qdisc; | |
105 | *old = xchg(&flow->q, new); | |
106 | if (*old) | |
107 | qdisc_reset(*old); | |
10297b99 | 108 | return 0; |
1da177e4 LT |
109 | } |
110 | ||
b0188d4d | 111 | static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 112 | { |
b0188d4d | 113 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 114 | |
786a9036 | 115 | pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
1da177e4 LT |
116 | return flow ? flow->q : NULL; |
117 | } | |
118 | ||
b0188d4d | 119 | static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid) |
1da177e4 | 120 | { |
786a9036 | 121 | struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
1da177e4 LT |
122 | struct atm_flow_data *flow; |
123 | ||
786a9036 | 124 | pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); |
b0188d4d PM |
125 | flow = lookup_flow(sch, classid); |
126 | if (flow) | |
127 | flow->ref++; | |
786a9036 | 128 | pr_debug("atm_tc_get: flow %p\n", flow); |
b0188d4d | 129 | return (unsigned long)flow; |
1da177e4 LT |
130 | } |
131 | ||
1da177e4 | 132 | static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
b0188d4d | 133 | unsigned long parent, u32 classid) |
1da177e4 | 134 | { |
b0188d4d | 135 | return atm_tc_get(sch, classid); |
1da177e4 LT |
136 | } |
137 | ||
1da177e4 LT |
138 | /* |
139 | * atm_tc_put handles all destructions, including the ones that are explicitly | |
140 | * requested (atm_tc_destroy, etc.). The assumption here is that we never drop | |
141 | * anything that still seems to be in use. | |
142 | */ | |
1da177e4 LT |
143 | static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
144 | { | |
786a9036 | 145 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 146 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 LT |
147 | struct atm_flow_data **prev; |
148 | ||
786a9036 | 149 | pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
b0188d4d PM |
150 | if (--flow->ref) |
151 | return; | |
786a9036 | 152 | pr_debug("atm_tc_put: destroying\n"); |
1da177e4 | 153 | for (prev = &p->flows; *prev; prev = &(*prev)->next) |
b0188d4d PM |
154 | if (*prev == flow) |
155 | break; | |
1da177e4 | 156 | if (!*prev) { |
b0188d4d | 157 | printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow); |
1da177e4 LT |
158 | return; |
159 | } | |
160 | *prev = flow->next; | |
786a9036 | 161 | pr_debug("atm_tc_put: qdisc %p\n", flow->q); |
1da177e4 | 162 | qdisc_destroy(flow->q); |
a48b5a61 | 163 | tcf_destroy_chain(flow->filter_list); |
1da177e4 | 164 | if (flow->sock) { |
786a9036 | 165 | pr_debug("atm_tc_put: f_count %d\n", |
b0188d4d | 166 | file_count(flow->sock->file)); |
1da177e4 LT |
167 | flow->vcc->pop = flow->old_pop; |
168 | sockfd_put(flow->sock); | |
169 | } | |
b0188d4d PM |
170 | if (flow->excess) |
171 | atm_tc_put(sch, (unsigned long)flow->excess); | |
172 | if (flow != &p->link) | |
173 | kfree(flow); | |
1da177e4 LT |
174 | /* |
175 | * If flow == &p->link, the qdisc no longer works at this point and | |
176 | * needs to be removed. (By the caller of atm_tc_put.) | |
177 | */ | |
178 | } | |
179 | ||
b0188d4d | 180 | static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
181 | { |
182 | struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; | |
183 | ||
786a9036 | 184 | pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
b0188d4d | 185 | VCC2FLOW(vcc)->old_pop(vcc, skb); |
1da177e4 LT |
186 | tasklet_schedule(&p->task); |
187 | } | |
188 | ||
189 | static const u8 llc_oui_ip[] = { | |
b0188d4d PM |
190 | 0xaa, /* DSAP: non-ISO */ |
191 | 0xaa, /* SSAP: non-ISO */ | |
192 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
193 | 0x00, /* OUI: EtherType */ | |
1da177e4 | 194 | 0x00, 0x00, |
b0188d4d PM |
195 | 0x08, 0x00 |
196 | }; /* Ethertype IP (0800) */ | |
1da177e4 LT |
197 | |
198 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, | |
b0188d4d | 199 | struct rtattr **tca, unsigned long *arg) |
1da177e4 | 200 | { |
786a9036 | 201 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 202 | struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
1da177e4 | 203 | struct atm_flow_data *excess = NULL; |
b0188d4d | 204 | struct rtattr *opt = tca[TCA_OPTIONS - 1]; |
1da177e4 LT |
205 | struct rtattr *tb[TCA_ATM_MAX]; |
206 | struct socket *sock; | |
b0188d4d | 207 | int fd, error, hdr_len; |
1da177e4 LT |
208 | void *hdr; |
209 | ||
786a9036 | 210 | pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
b0188d4d | 211 | "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
1da177e4 LT |
212 | /* |
213 | * The concept of parents doesn't apply for this qdisc. | |
214 | */ | |
215 | if (parent && parent != TC_H_ROOT && parent != sch->handle) | |
216 | return -EINVAL; | |
217 | /* | |
218 | * ATM classes cannot be changed. In order to change properties of the | |
219 | * ATM connection, that socket needs to be modified directly (via the | |
220 | * native ATM API. In order to send a flow to a different VC, the old | |
221 | * class needs to be removed and a new one added. (This may be changed | |
222 | * later.) | |
223 | */ | |
b0188d4d PM |
224 | if (flow) |
225 | return -EBUSY; | |
1da177e4 LT |
226 | if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt)) |
227 | return -EINVAL; | |
b0188d4d | 228 | if (!tb[TCA_ATM_FD - 1] || RTA_PAYLOAD(tb[TCA_ATM_FD - 1]) < sizeof(fd)) |
1da177e4 | 229 | return -EINVAL; |
b0188d4d | 230 | fd = *(int *)RTA_DATA(tb[TCA_ATM_FD - 1]); |
786a9036 | 231 | pr_debug("atm_tc_change: fd %d\n", fd); |
b0188d4d PM |
232 | if (tb[TCA_ATM_HDR - 1]) { |
233 | hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR - 1]); | |
234 | hdr = RTA_DATA(tb[TCA_ATM_HDR - 1]); | |
235 | } else { | |
1da177e4 | 236 | hdr_len = RFC1483LLC_LEN; |
b0188d4d | 237 | hdr = NULL; /* default LLC/SNAP for IP */ |
1da177e4 | 238 | } |
b0188d4d PM |
239 | if (!tb[TCA_ATM_EXCESS - 1]) |
240 | excess = NULL; | |
1da177e4 | 241 | else { |
b0188d4d | 242 | if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS - 1]) != sizeof(u32)) |
1da177e4 | 243 | return -EINVAL; |
b0188d4d PM |
244 | excess = (struct atm_flow_data *) |
245 | atm_tc_get(sch, *(u32 *)RTA_DATA(tb[TCA_ATM_EXCESS - 1])); | |
246 | if (!excess) | |
247 | return -ENOENT; | |
1da177e4 | 248 | } |
786a9036 SH |
249 | pr_debug("atm_tc_change: type %d, payload %lu, hdr_len %d\n", |
250 | opt->rta_type, RTA_PAYLOAD(opt), hdr_len); | |
251 | sock = sockfd_lookup(fd, &error); | |
252 | if (!sock) | |
b0188d4d | 253 | return error; /* f_count++ */ |
786a9036 | 254 | pr_debug("atm_tc_change: f_count %d\n", file_count(sock->file)); |
10297b99 | 255 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
1da177e4 | 256 | error = -EPROTOTYPE; |
10297b99 | 257 | goto err_out; |
1da177e4 LT |
258 | } |
259 | /* @@@ should check if the socket is really operational or we'll crash | |
260 | on vcc->send */ | |
261 | if (classid) { | |
262 | if (TC_H_MAJ(classid ^ sch->handle)) { | |
786a9036 | 263 | pr_debug("atm_tc_change: classid mismatch\n"); |
1da177e4 LT |
264 | error = -EINVAL; |
265 | goto err_out; | |
266 | } | |
b0188d4d | 267 | if (find_flow(p, flow)) { |
1da177e4 LT |
268 | error = -EEXIST; |
269 | goto err_out; | |
270 | } | |
b0188d4d | 271 | } else { |
1da177e4 LT |
272 | int i; |
273 | unsigned long cl; | |
274 | ||
275 | for (i = 1; i < 0x8000; i++) { | |
b0188d4d | 276 | classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
786a9036 SH |
277 | cl = atm_tc_get(sch, classid); |
278 | if (!cl) | |
b0188d4d PM |
279 | break; |
280 | atm_tc_put(sch, cl); | |
1da177e4 LT |
281 | } |
282 | } | |
786a9036 | 283 | pr_debug("atm_tc_change: new id %x\n", classid); |
782f7956 | 284 | flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
786a9036 | 285 | pr_debug("atm_tc_change: flow %p\n", flow); |
1da177e4 LT |
286 | if (!flow) { |
287 | error = -ENOBUFS; | |
288 | goto err_out; | |
289 | } | |
1da177e4 | 290 | flow->filter_list = NULL; |
786a9036 SH |
291 | flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid); |
292 | if (!flow->q) | |
1da177e4 | 293 | flow->q = &noop_qdisc; |
786a9036 | 294 | pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
1da177e4 | 295 | flow->sock = sock; |
b0188d4d | 296 | flow->vcc = ATM_SD(sock); /* speedup */ |
1da177e4 | 297 | flow->vcc->user_back = flow; |
786a9036 | 298 | pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
1da177e4 LT |
299 | flow->old_pop = flow->vcc->pop; |
300 | flow->parent = p; | |
301 | flow->vcc->pop = sch_atm_pop; | |
302 | flow->classid = classid; | |
303 | flow->ref = 1; | |
304 | flow->excess = excess; | |
305 | flow->next = p->link.next; | |
306 | p->link.next = flow; | |
307 | flow->hdr_len = hdr_len; | |
308 | if (hdr) | |
b0188d4d | 309 | memcpy(flow->hdr, hdr, hdr_len); |
1da177e4 | 310 | else |
b0188d4d PM |
311 | memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
312 | *arg = (unsigned long)flow; | |
1da177e4 LT |
313 | return 0; |
314 | err_out: | |
b0188d4d PM |
315 | if (excess) |
316 | atm_tc_put(sch, (unsigned long)excess); | |
1da177e4 LT |
317 | sockfd_put(sock); |
318 | return error; | |
319 | } | |
320 | ||
b0188d4d | 321 | static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
1da177e4 | 322 | { |
786a9036 | 323 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 324 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 325 | |
786a9036 SH |
326 | pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
327 | if (!find_flow(qdisc_priv(sch), flow)) | |
b0188d4d PM |
328 | return -EINVAL; |
329 | if (flow->filter_list || flow == &p->link) | |
330 | return -EBUSY; | |
1da177e4 LT |
331 | /* |
332 | * Reference count must be 2: one for "keepalive" (set at class | |
333 | * creation), and one for the reference held when calling delete. | |
334 | */ | |
335 | if (flow->ref < 2) { | |
b0188d4d | 336 | printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref); |
1da177e4 LT |
337 | return -EINVAL; |
338 | } | |
b0188d4d PM |
339 | if (flow->ref > 2) |
340 | return -EBUSY; /* catch references via excess, etc. */ | |
341 | atm_tc_put(sch, arg); | |
1da177e4 LT |
342 | return 0; |
343 | } | |
344 | ||
b0188d4d | 345 | static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 | 346 | { |
786a9036 | 347 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
348 | struct atm_flow_data *flow; |
349 | ||
786a9036 | 350 | pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
b0188d4d PM |
351 | if (walker->stop) |
352 | return; | |
1da177e4 LT |
353 | for (flow = p->flows; flow; flow = flow->next) { |
354 | if (walker->count >= walker->skip) | |
b0188d4d | 355 | if (walker->fn(sch, (unsigned long)flow, walker) < 0) { |
1da177e4 LT |
356 | walker->stop = 1; |
357 | break; | |
358 | } | |
359 | walker->count++; | |
360 | } | |
361 | } | |
362 | ||
b0188d4d | 363 | static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 364 | { |
786a9036 | 365 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 366 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 367 | |
786a9036 | 368 | pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
10297b99 | 369 | return flow ? &flow->filter_list : &p->link.filter_list; |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 LT |
372 | /* --------------------------- Qdisc operations ---------------------------- */ |
373 | ||
b0188d4d | 374 | static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 375 | { |
786a9036 | 376 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 377 | struct atm_flow_data *flow = NULL; /* @@@ */ |
1da177e4 LT |
378 | struct tcf_result res; |
379 | int result; | |
380 | int ret = NET_XMIT_POLICED; | |
381 | ||
786a9036 | 382 | pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
b0188d4d | 383 | result = TC_POLICE_OK; /* be nice to gcc */ |
1da177e4 | 384 | if (TC_H_MAJ(skb->priority) != sch->handle || |
b0188d4d | 385 | !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) |
1da177e4 LT |
386 | for (flow = p->flows; flow; flow = flow->next) |
387 | if (flow->filter_list) { | |
73ca4918 PM |
388 | result = tc_classify_compat(skb, |
389 | flow->filter_list, | |
390 | &res); | |
b0188d4d PM |
391 | if (result < 0) |
392 | continue; | |
393 | flow = (struct atm_flow_data *)res.class; | |
394 | if (!flow) | |
395 | flow = lookup_flow(sch, res.classid); | |
1da177e4 LT |
396 | break; |
397 | } | |
b0188d4d PM |
398 | if (!flow) |
399 | flow = &p->link; | |
1da177e4 LT |
400 | else { |
401 | if (flow->vcc) | |
402 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; | |
b0188d4d | 403 | /*@@@ looks good ... but it's not supposed to work :-) */ |
92100804 PM |
404 | #ifdef CONFIG_NET_CLS_ACT |
405 | switch (result) { | |
406 | case TC_ACT_QUEUED: | |
407 | case TC_ACT_STOLEN: | |
408 | kfree_skb(skb); | |
409 | return NET_XMIT_SUCCESS; | |
410 | case TC_ACT_SHOT: | |
411 | kfree_skb(skb); | |
412 | goto drop; | |
73ca4918 PM |
413 | case TC_POLICE_RECLASSIFY: |
414 | if (flow->excess) | |
415 | flow = flow->excess; | |
416 | else | |
417 | ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; | |
418 | break; | |
92100804 | 419 | } |
1da177e4 LT |
420 | #endif |
421 | } | |
c3bc7cff | 422 | |
786a9036 SH |
423 | ret = flow->q->enqueue(skb, flow->q); |
424 | if (ret != 0) { | |
92100804 | 425 | drop: __maybe_unused |
1da177e4 | 426 | sch->qstats.drops++; |
b0188d4d PM |
427 | if (flow) |
428 | flow->qstats.drops++; | |
1da177e4 LT |
429 | return ret; |
430 | } | |
431 | sch->bstats.bytes += skb->len; | |
432 | sch->bstats.packets++; | |
433 | flow->bstats.bytes += skb->len; | |
434 | flow->bstats.packets++; | |
435 | /* | |
436 | * Okay, this may seem weird. We pretend we've dropped the packet if | |
437 | * it goes via ATM. The reason for this is that the outer qdisc | |
438 | * expects to be able to q->dequeue the packet later on if we return | |
439 | * success at this place. Also, sch->q.qdisc needs to reflect whether | |
440 | * there is a packet egligible for dequeuing or not. Note that the | |
441 | * statistics of the outer qdisc are necessarily wrong because of all | |
442 | * this. There's currently no correct solution for this. | |
443 | */ | |
444 | if (flow == &p->link) { | |
445 | sch->q.qlen++; | |
446 | return 0; | |
447 | } | |
448 | tasklet_schedule(&p->task); | |
449 | return NET_XMIT_BYPASS; | |
450 | } | |
451 | ||
1da177e4 LT |
452 | /* |
453 | * Dequeue packets and send them over ATM. Note that we quite deliberately | |
454 | * avoid checking net_device's flow control here, simply because sch_atm | |
455 | * uses its own channels, which have nothing to do with any CLIP/LANE/or | |
456 | * non-ATM interfaces. | |
457 | */ | |
458 | ||
1da177e4 LT |
459 | static void sch_atm_dequeue(unsigned long data) |
460 | { | |
b0188d4d | 461 | struct Qdisc *sch = (struct Qdisc *)data; |
786a9036 | 462 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
463 | struct atm_flow_data *flow; |
464 | struct sk_buff *skb; | |
465 | ||
786a9036 | 466 | pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
467 | for (flow = p->link.next; flow; flow = flow->next) |
468 | /* | |
469 | * If traffic is properly shaped, this won't generate nasty | |
470 | * little bursts. Otherwise, it may ... (but that's okay) | |
471 | */ | |
472 | while ((skb = flow->q->dequeue(flow->q))) { | |
b0188d4d PM |
473 | if (!atm_may_send(flow->vcc, skb->truesize)) { |
474 | (void)flow->q->ops->requeue(skb, flow->q); | |
1da177e4 LT |
475 | break; |
476 | } | |
786a9036 | 477 | pr_debug("atm_tc_dequeue: sending on class %p\n", flow); |
1da177e4 | 478 | /* remove any LL header somebody else has attached */ |
eddc9ec5 | 479 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
480 | if (skb_headroom(skb) < flow->hdr_len) { |
481 | struct sk_buff *new; | |
482 | ||
b0188d4d | 483 | new = skb_realloc_headroom(skb, flow->hdr_len); |
1da177e4 | 484 | dev_kfree_skb(skb); |
b0188d4d PM |
485 | if (!new) |
486 | continue; | |
1da177e4 LT |
487 | skb = new; |
488 | } | |
786a9036 | 489 | pr_debug("sch_atm_dequeue: ip %p, data %p\n", |
eddc9ec5 | 490 | skb_network_header(skb), skb->data); |
1da177e4 | 491 | ATM_SKB(skb)->vcc = flow->vcc; |
b0188d4d PM |
492 | memcpy(skb_push(skb, flow->hdr_len), flow->hdr, |
493 | flow->hdr_len); | |
1da177e4 LT |
494 | atomic_add(skb->truesize, |
495 | &sk_atm(flow->vcc)->sk_wmem_alloc); | |
496 | /* atm.atm_options are already set by atm_tc_enqueue */ | |
b0188d4d | 497 | flow->vcc->send(flow->vcc, skb); |
1da177e4 LT |
498 | } |
499 | } | |
500 | ||
1da177e4 LT |
501 | static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
502 | { | |
786a9036 | 503 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
504 | struct sk_buff *skb; |
505 | ||
786a9036 | 506 | pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
507 | tasklet_schedule(&p->task); |
508 | skb = p->link.q->dequeue(p->link.q); | |
b0188d4d PM |
509 | if (skb) |
510 | sch->q.qlen--; | |
1da177e4 LT |
511 | return skb; |
512 | } | |
513 | ||
b0188d4d | 514 | static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 515 | { |
786a9036 | 516 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
517 | int ret; |
518 | ||
786a9036 | 519 | pr_debug("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
b0188d4d | 520 | ret = p->link.q->ops->requeue(skb, p->link.q); |
1da177e4 | 521 | if (!ret) { |
b0188d4d PM |
522 | sch->q.qlen++; |
523 | sch->qstats.requeues++; | |
524 | } else { | |
1da177e4 LT |
525 | sch->qstats.drops++; |
526 | p->link.qstats.drops++; | |
527 | } | |
528 | return ret; | |
529 | } | |
530 | ||
1da177e4 LT |
531 | static unsigned int atm_tc_drop(struct Qdisc *sch) |
532 | { | |
786a9036 | 533 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
534 | struct atm_flow_data *flow; |
535 | unsigned int len; | |
536 | ||
786a9036 | 537 | pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
538 | for (flow = p->flows; flow; flow = flow->next) |
539 | if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q))) | |
540 | return len; | |
541 | return 0; | |
542 | } | |
543 | ||
b0188d4d | 544 | static int atm_tc_init(struct Qdisc *sch, struct rtattr *opt) |
1da177e4 | 545 | { |
786a9036 | 546 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 | 547 | |
786a9036 | 548 | pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
1da177e4 | 549 | p->flows = &p->link; |
786a9036 SH |
550 | p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle); |
551 | if (!p->link.q) | |
1da177e4 | 552 | p->link.q = &noop_qdisc; |
786a9036 | 553 | pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
1da177e4 LT |
554 | p->link.filter_list = NULL; |
555 | p->link.vcc = NULL; | |
556 | p->link.sock = NULL; | |
557 | p->link.classid = sch->handle; | |
558 | p->link.ref = 1; | |
559 | p->link.next = NULL; | |
b0188d4d | 560 | tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); |
1da177e4 LT |
561 | return 0; |
562 | } | |
563 | ||
1da177e4 LT |
564 | static void atm_tc_reset(struct Qdisc *sch) |
565 | { | |
786a9036 | 566 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
567 | struct atm_flow_data *flow; |
568 | ||
786a9036 | 569 | pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
b0188d4d PM |
570 | for (flow = p->flows; flow; flow = flow->next) |
571 | qdisc_reset(flow->q); | |
1da177e4 LT |
572 | sch->q.qlen = 0; |
573 | } | |
574 | ||
1da177e4 LT |
575 | static void atm_tc_destroy(struct Qdisc *sch) |
576 | { | |
786a9036 | 577 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
578 | struct atm_flow_data *flow; |
579 | ||
786a9036 | 580 | pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
581 | /* races ? */ |
582 | while ((flow = p->flows)) { | |
a48b5a61 | 583 | tcf_destroy_chain(flow->filter_list); |
b00b4bf9 | 584 | flow->filter_list = NULL; |
1da177e4 | 585 | if (flow->ref > 1) |
b0188d4d PM |
586 | printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow, |
587 | flow->ref); | |
588 | atm_tc_put(sch, (unsigned long)flow); | |
1da177e4 LT |
589 | if (p->flows == flow) { |
590 | printk(KERN_ERR "atm_destroy: putting flow %p didn't " | |
b0188d4d PM |
591 | "kill it\n", flow); |
592 | p->flows = flow->next; /* brute force */ | |
1da177e4 LT |
593 | break; |
594 | } | |
595 | } | |
596 | tasklet_kill(&p->task); | |
597 | } | |
598 | ||
1da177e4 | 599 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
b0188d4d | 600 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 | 601 | { |
786a9036 | 602 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 603 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
27a884dc | 604 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
605 | struct rtattr *rta; |
606 | ||
786a9036 | 607 | pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
b0188d4d PM |
608 | sch, p, flow, skb, tcm); |
609 | if (!find_flow(p, flow)) | |
610 | return -EINVAL; | |
1da177e4 | 611 | tcm->tcm_handle = flow->classid; |
cdc7f8e3 | 612 | tcm->tcm_info = flow->q->handle; |
b0188d4d PM |
613 | rta = (struct rtattr *)b; |
614 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
615 | RTA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr); | |
1da177e4 LT |
616 | if (flow->vcc) { |
617 | struct sockaddr_atmpvc pvc; | |
618 | int state; | |
619 | ||
620 | pvc.sap_family = AF_ATMPVC; | |
621 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; | |
622 | pvc.sap_addr.vpi = flow->vcc->vpi; | |
623 | pvc.sap_addr.vci = flow->vcc->vci; | |
b0188d4d | 624 | RTA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc); |
1da177e4 | 625 | state = ATM_VF2VS(flow->vcc->flags); |
b0188d4d | 626 | RTA_PUT(skb, TCA_ATM_STATE, sizeof(state), &state); |
1da177e4 LT |
627 | } |
628 | if (flow->excess) | |
b0188d4d | 629 | RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(u32), &flow->classid); |
1da177e4 LT |
630 | else { |
631 | static u32 zero; | |
632 | ||
b0188d4d | 633 | RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(zero), &zero); |
1da177e4 | 634 | } |
27a884dc | 635 | rta->rta_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
636 | return skb->len; |
637 | ||
638 | rtattr_failure: | |
dc5fc579 | 639 | nlmsg_trim(skb, b); |
1da177e4 LT |
640 | return -1; |
641 | } | |
642 | static int | |
643 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
b0188d4d | 644 | struct gnet_dump *d) |
1da177e4 | 645 | { |
b0188d4d | 646 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 LT |
647 | |
648 | flow->qstats.qlen = flow->q->q.qlen; | |
649 | ||
650 | if (gnet_stats_copy_basic(d, &flow->bstats) < 0 || | |
651 | gnet_stats_copy_queue(d, &flow->qstats) < 0) | |
652 | return -1; | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) | |
658 | { | |
659 | return 0; | |
660 | } | |
661 | ||
20fea08b | 662 | static const struct Qdisc_class_ops atm_class_ops = { |
b0188d4d PM |
663 | .graft = atm_tc_graft, |
664 | .leaf = atm_tc_leaf, | |
665 | .get = atm_tc_get, | |
666 | .put = atm_tc_put, | |
667 | .change = atm_tc_change, | |
668 | .delete = atm_tc_delete, | |
669 | .walk = atm_tc_walk, | |
670 | .tcf_chain = atm_tc_find_tcf, | |
671 | .bind_tcf = atm_tc_bind_filter, | |
672 | .unbind_tcf = atm_tc_put, | |
673 | .dump = atm_tc_dump_class, | |
674 | .dump_stats = atm_tc_dump_class_stats, | |
1da177e4 LT |
675 | }; |
676 | ||
20fea08b | 677 | static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
b0188d4d PM |
678 | .cl_ops = &atm_class_ops, |
679 | .id = "atm", | |
680 | .priv_size = sizeof(struct atm_qdisc_data), | |
681 | .enqueue = atm_tc_enqueue, | |
682 | .dequeue = atm_tc_dequeue, | |
683 | .requeue = atm_tc_requeue, | |
684 | .drop = atm_tc_drop, | |
685 | .init = atm_tc_init, | |
686 | .reset = atm_tc_reset, | |
687 | .destroy = atm_tc_destroy, | |
688 | .dump = atm_tc_dump, | |
689 | .owner = THIS_MODULE, | |
1da177e4 LT |
690 | }; |
691 | ||
1da177e4 LT |
692 | static int __init atm_init(void) |
693 | { | |
694 | return register_qdisc(&atm_qdisc_ops); | |
695 | } | |
696 | ||
10297b99 | 697 | static void __exit atm_exit(void) |
1da177e4 LT |
698 | { |
699 | unregister_qdisc(&atm_qdisc_ops); | |
700 | } | |
701 | ||
702 | module_init(atm_init) | |
703 | module_exit(atm_exit) | |
704 | MODULE_LICENSE("GPL"); |