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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 | 5 | #include <linux/module.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
1da177e4 LT |
7 | #include <linux/init.h> |
8 | #include <linux/string.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/skbuff.h> | |
1da177e4 LT |
11 | #include <linux/atmdev.h> |
12 | #include <linux/atmclip.h> | |
1da177e4 | 13 | #include <linux/rtnetlink.h> |
b0188d4d | 14 | #include <linux/file.h> /* for fput */ |
dc5fc579 | 15 | #include <net/netlink.h> |
1da177e4 | 16 | #include <net/pkt_sched.h> |
1da177e4 | 17 | |
b0188d4d | 18 | extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */ |
1da177e4 | 19 | |
1da177e4 LT |
20 | /* |
21 | * The ATM queuing discipline provides a framework for invoking classifiers | |
22 | * (aka "filters"), which in turn select classes of this queuing discipline. | |
23 | * Each class maps the flow(s) it is handling to a given VC. Multiple classes | |
24 | * may share the same VC. | |
25 | * | |
26 | * When creating a class, VCs are specified by passing the number of the open | |
27 | * socket descriptor by which the calling process references the VC. The kernel | |
28 | * keeps the VC open at least until all classes using it are removed. | |
29 | * | |
30 | * In this file, most functions are named atm_tc_* to avoid confusion with all | |
31 | * the atm_* in net/atm. This naming convention differs from what's used in the | |
32 | * rest of net/sched. | |
33 | * | |
34 | * Known bugs: | |
35 | * - sometimes messes up the IP stack | |
36 | * - any manipulations besides the few operations described in the README, are | |
37 | * untested and likely to crash the system | |
38 | * - should lock the flow while there is data in the queue (?) | |
39 | */ | |
40 | ||
1da177e4 LT |
41 | #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) |
42 | ||
1da177e4 | 43 | struct atm_flow_data { |
b0188d4d | 44 | struct Qdisc *q; /* FIFO, TBF, etc. */ |
1da177e4 | 45 | struct tcf_proto *filter_list; |
b0188d4d PM |
46 | struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
47 | void (*old_pop)(struct atm_vcc *vcc, | |
786a9036 | 48 | struct sk_buff *skb); /* chaining */ |
1da177e4 LT |
49 | struct atm_qdisc_data *parent; /* parent qdisc */ |
50 | struct socket *sock; /* for closing */ | |
51 | u32 classid; /* x:y type ID */ | |
52 | int ref; /* reference count */ | |
c1a8f1f1 | 53 | struct gnet_stats_basic_packed bstats; |
1da177e4 | 54 | struct gnet_stats_queue qstats; |
1da177e4 LT |
55 | struct atm_flow_data *next; |
56 | struct atm_flow_data *excess; /* flow for excess traffic; | |
57 | NULL to set CLP instead */ | |
58 | int hdr_len; | |
59 | unsigned char hdr[0]; /* header data; MUST BE LAST */ | |
60 | }; | |
61 | ||
62 | struct atm_qdisc_data { | |
63 | struct atm_flow_data link; /* unclassified skbs go here */ | |
64 | struct atm_flow_data *flows; /* NB: "link" is also on this | |
65 | list */ | |
f30ab418 | 66 | struct tasklet_struct task; /* dequeue tasklet */ |
1da177e4 LT |
67 | }; |
68 | ||
1da177e4 LT |
69 | /* ------------------------- Class/flow operations ------------------------- */ |
70 | ||
b0188d4d | 71 | static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow) |
1da177e4 LT |
72 | { |
73 | struct atm_flow_data *walk; | |
74 | ||
786a9036 | 75 | pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow); |
1da177e4 | 76 | for (walk = qdisc->flows; walk; walk = walk->next) |
b0188d4d PM |
77 | if (walk == flow) |
78 | return 1; | |
786a9036 | 79 | pr_debug("find_flow: not found\n"); |
1da177e4 LT |
80 | return 0; |
81 | } | |
82 | ||
b0188d4d | 83 | static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
1da177e4 | 84 | { |
786a9036 | 85 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
86 | struct atm_flow_data *flow; |
87 | ||
10297b99 | 88 | for (flow = p->flows; flow; flow = flow->next) |
b0188d4d PM |
89 | if (flow->classid == classid) |
90 | break; | |
1da177e4 LT |
91 | return flow; |
92 | } | |
93 | ||
b0188d4d PM |
94 | static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
95 | struct Qdisc *new, struct Qdisc **old) | |
1da177e4 | 96 | { |
786a9036 | 97 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d PM |
98 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
99 | ||
786a9036 | 100 | pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", |
b0188d4d PM |
101 | sch, p, flow, new, old); |
102 | if (!find_flow(p, flow)) | |
103 | return -EINVAL; | |
104 | if (!new) | |
105 | new = &noop_qdisc; | |
b94c8afc PM |
106 | *old = flow->q; |
107 | flow->q = new; | |
b0188d4d PM |
108 | if (*old) |
109 | qdisc_reset(*old); | |
10297b99 | 110 | return 0; |
1da177e4 LT |
111 | } |
112 | ||
b0188d4d | 113 | static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 114 | { |
b0188d4d | 115 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 116 | |
786a9036 | 117 | pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
1da177e4 LT |
118 | return flow ? flow->q : NULL; |
119 | } | |
120 | ||
b0188d4d | 121 | static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid) |
1da177e4 | 122 | { |
786a9036 | 123 | struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
1da177e4 LT |
124 | struct atm_flow_data *flow; |
125 | ||
786a9036 | 126 | pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); |
b0188d4d PM |
127 | flow = lookup_flow(sch, classid); |
128 | if (flow) | |
129 | flow->ref++; | |
786a9036 | 130 | pr_debug("atm_tc_get: flow %p\n", flow); |
b0188d4d | 131 | return (unsigned long)flow; |
1da177e4 LT |
132 | } |
133 | ||
1da177e4 | 134 | static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
b0188d4d | 135 | unsigned long parent, u32 classid) |
1da177e4 | 136 | { |
b0188d4d | 137 | return atm_tc_get(sch, classid); |
1da177e4 LT |
138 | } |
139 | ||
1da177e4 LT |
140 | /* |
141 | * atm_tc_put handles all destructions, including the ones that are explicitly | |
142 | * requested (atm_tc_destroy, etc.). The assumption here is that we never drop | |
143 | * anything that still seems to be in use. | |
144 | */ | |
1da177e4 LT |
145 | static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
146 | { | |
786a9036 | 147 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 148 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 LT |
149 | struct atm_flow_data **prev; |
150 | ||
786a9036 | 151 | pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
b0188d4d PM |
152 | if (--flow->ref) |
153 | return; | |
786a9036 | 154 | pr_debug("atm_tc_put: destroying\n"); |
1da177e4 | 155 | for (prev = &p->flows; *prev; prev = &(*prev)->next) |
b0188d4d PM |
156 | if (*prev == flow) |
157 | break; | |
1da177e4 | 158 | if (!*prev) { |
b0188d4d | 159 | printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow); |
1da177e4 LT |
160 | return; |
161 | } | |
162 | *prev = flow->next; | |
786a9036 | 163 | pr_debug("atm_tc_put: qdisc %p\n", flow->q); |
1da177e4 | 164 | qdisc_destroy(flow->q); |
ff31ab56 | 165 | tcf_destroy_chain(&flow->filter_list); |
1da177e4 | 166 | if (flow->sock) { |
516e0cc5 | 167 | pr_debug("atm_tc_put: f_count %ld\n", |
b0188d4d | 168 | file_count(flow->sock->file)); |
1da177e4 LT |
169 | flow->vcc->pop = flow->old_pop; |
170 | sockfd_put(flow->sock); | |
171 | } | |
b0188d4d PM |
172 | if (flow->excess) |
173 | atm_tc_put(sch, (unsigned long)flow->excess); | |
174 | if (flow != &p->link) | |
175 | kfree(flow); | |
1da177e4 LT |
176 | /* |
177 | * If flow == &p->link, the qdisc no longer works at this point and | |
178 | * needs to be removed. (By the caller of atm_tc_put.) | |
179 | */ | |
180 | } | |
181 | ||
b0188d4d | 182 | static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
183 | { |
184 | struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; | |
185 | ||
786a9036 | 186 | pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
b0188d4d | 187 | VCC2FLOW(vcc)->old_pop(vcc, skb); |
1da177e4 LT |
188 | tasklet_schedule(&p->task); |
189 | } | |
190 | ||
191 | static const u8 llc_oui_ip[] = { | |
b0188d4d PM |
192 | 0xaa, /* DSAP: non-ISO */ |
193 | 0xaa, /* SSAP: non-ISO */ | |
194 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
195 | 0x00, /* OUI: EtherType */ | |
1da177e4 | 196 | 0x00, 0x00, |
b0188d4d PM |
197 | 0x08, 0x00 |
198 | }; /* Ethertype IP (0800) */ | |
1da177e4 | 199 | |
27a3421e PM |
200 | static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = { |
201 | [TCA_ATM_FD] = { .type = NLA_U32 }, | |
202 | [TCA_ATM_EXCESS] = { .type = NLA_U32 }, | |
203 | }; | |
204 | ||
1da177e4 | 205 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
1e90474c | 206 | struct nlattr **tca, unsigned long *arg) |
1da177e4 | 207 | { |
786a9036 | 208 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 209 | struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
1da177e4 | 210 | struct atm_flow_data *excess = NULL; |
1e90474c PM |
211 | struct nlattr *opt = tca[TCA_OPTIONS]; |
212 | struct nlattr *tb[TCA_ATM_MAX + 1]; | |
1da177e4 | 213 | struct socket *sock; |
b0188d4d | 214 | int fd, error, hdr_len; |
1da177e4 LT |
215 | void *hdr; |
216 | ||
786a9036 | 217 | pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
b0188d4d | 218 | "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
1da177e4 LT |
219 | /* |
220 | * The concept of parents doesn't apply for this qdisc. | |
221 | */ | |
222 | if (parent && parent != TC_H_ROOT && parent != sch->handle) | |
223 | return -EINVAL; | |
224 | /* | |
225 | * ATM classes cannot be changed. In order to change properties of the | |
226 | * ATM connection, that socket needs to be modified directly (via the | |
227 | * native ATM API. In order to send a flow to a different VC, the old | |
228 | * class needs to be removed and a new one added. (This may be changed | |
229 | * later.) | |
230 | */ | |
b0188d4d PM |
231 | if (flow) |
232 | return -EBUSY; | |
cee63723 | 233 | if (opt == NULL) |
1da177e4 | 234 | return -EINVAL; |
27a3421e PM |
235 | |
236 | error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy); | |
cee63723 PM |
237 | if (error < 0) |
238 | return error; | |
239 | ||
27a3421e | 240 | if (!tb[TCA_ATM_FD]) |
1da177e4 | 241 | return -EINVAL; |
1587bac4 | 242 | fd = nla_get_u32(tb[TCA_ATM_FD]); |
786a9036 | 243 | pr_debug("atm_tc_change: fd %d\n", fd); |
1e90474c PM |
244 | if (tb[TCA_ATM_HDR]) { |
245 | hdr_len = nla_len(tb[TCA_ATM_HDR]); | |
246 | hdr = nla_data(tb[TCA_ATM_HDR]); | |
b0188d4d | 247 | } else { |
1da177e4 | 248 | hdr_len = RFC1483LLC_LEN; |
b0188d4d | 249 | hdr = NULL; /* default LLC/SNAP for IP */ |
1da177e4 | 250 | } |
1e90474c | 251 | if (!tb[TCA_ATM_EXCESS]) |
b0188d4d | 252 | excess = NULL; |
1da177e4 | 253 | else { |
b0188d4d | 254 | excess = (struct atm_flow_data *) |
1587bac4 | 255 | atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS])); |
b0188d4d PM |
256 | if (!excess) |
257 | return -ENOENT; | |
1da177e4 | 258 | } |
f5e5cb75 | 259 | pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
1e90474c | 260 | opt->nla_type, nla_len(opt), hdr_len); |
786a9036 SH |
261 | sock = sockfd_lookup(fd, &error); |
262 | if (!sock) | |
b0188d4d | 263 | return error; /* f_count++ */ |
516e0cc5 | 264 | pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file)); |
10297b99 | 265 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
1da177e4 | 266 | error = -EPROTOTYPE; |
10297b99 | 267 | goto err_out; |
1da177e4 LT |
268 | } |
269 | /* @@@ should check if the socket is really operational or we'll crash | |
270 | on vcc->send */ | |
271 | if (classid) { | |
272 | if (TC_H_MAJ(classid ^ sch->handle)) { | |
786a9036 | 273 | pr_debug("atm_tc_change: classid mismatch\n"); |
1da177e4 LT |
274 | error = -EINVAL; |
275 | goto err_out; | |
276 | } | |
b0188d4d | 277 | if (find_flow(p, flow)) { |
1da177e4 LT |
278 | error = -EEXIST; |
279 | goto err_out; | |
280 | } | |
b0188d4d | 281 | } else { |
1da177e4 LT |
282 | int i; |
283 | unsigned long cl; | |
284 | ||
285 | for (i = 1; i < 0x8000; i++) { | |
b0188d4d | 286 | classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
786a9036 SH |
287 | cl = atm_tc_get(sch, classid); |
288 | if (!cl) | |
b0188d4d PM |
289 | break; |
290 | atm_tc_put(sch, cl); | |
1da177e4 LT |
291 | } |
292 | } | |
786a9036 | 293 | pr_debug("atm_tc_change: new id %x\n", classid); |
782f7956 | 294 | flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
786a9036 | 295 | pr_debug("atm_tc_change: flow %p\n", flow); |
1da177e4 LT |
296 | if (!flow) { |
297 | error = -ENOBUFS; | |
298 | goto err_out; | |
299 | } | |
1da177e4 | 300 | flow->filter_list = NULL; |
5ce2d488 | 301 | flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 302 | &pfifo_qdisc_ops, classid); |
786a9036 | 303 | if (!flow->q) |
1da177e4 | 304 | flow->q = &noop_qdisc; |
786a9036 | 305 | pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
1da177e4 | 306 | flow->sock = sock; |
b0188d4d | 307 | flow->vcc = ATM_SD(sock); /* speedup */ |
1da177e4 | 308 | flow->vcc->user_back = flow; |
786a9036 | 309 | pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
1da177e4 LT |
310 | flow->old_pop = flow->vcc->pop; |
311 | flow->parent = p; | |
312 | flow->vcc->pop = sch_atm_pop; | |
313 | flow->classid = classid; | |
314 | flow->ref = 1; | |
315 | flow->excess = excess; | |
316 | flow->next = p->link.next; | |
317 | p->link.next = flow; | |
318 | flow->hdr_len = hdr_len; | |
319 | if (hdr) | |
b0188d4d | 320 | memcpy(flow->hdr, hdr, hdr_len); |
1da177e4 | 321 | else |
b0188d4d PM |
322 | memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
323 | *arg = (unsigned long)flow; | |
1da177e4 LT |
324 | return 0; |
325 | err_out: | |
b0188d4d PM |
326 | if (excess) |
327 | atm_tc_put(sch, (unsigned long)excess); | |
1da177e4 LT |
328 | sockfd_put(sock); |
329 | return error; | |
330 | } | |
331 | ||
b0188d4d | 332 | static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
1da177e4 | 333 | { |
786a9036 | 334 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 335 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 336 | |
786a9036 SH |
337 | pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
338 | if (!find_flow(qdisc_priv(sch), flow)) | |
b0188d4d PM |
339 | return -EINVAL; |
340 | if (flow->filter_list || flow == &p->link) | |
341 | return -EBUSY; | |
1da177e4 LT |
342 | /* |
343 | * Reference count must be 2: one for "keepalive" (set at class | |
344 | * creation), and one for the reference held when calling delete. | |
345 | */ | |
346 | if (flow->ref < 2) { | |
b0188d4d | 347 | printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref); |
1da177e4 LT |
348 | return -EINVAL; |
349 | } | |
b0188d4d PM |
350 | if (flow->ref > 2) |
351 | return -EBUSY; /* catch references via excess, etc. */ | |
352 | atm_tc_put(sch, arg); | |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | ||
b0188d4d | 356 | static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 | 357 | { |
786a9036 | 358 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
359 | struct atm_flow_data *flow; |
360 | ||
786a9036 | 361 | pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
b0188d4d PM |
362 | if (walker->stop) |
363 | return; | |
1da177e4 LT |
364 | for (flow = p->flows; flow; flow = flow->next) { |
365 | if (walker->count >= walker->skip) | |
b0188d4d | 366 | if (walker->fn(sch, (unsigned long)flow, walker) < 0) { |
1da177e4 LT |
367 | walker->stop = 1; |
368 | break; | |
369 | } | |
370 | walker->count++; | |
371 | } | |
372 | } | |
373 | ||
b0188d4d | 374 | static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 375 | { |
786a9036 | 376 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 377 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 378 | |
786a9036 | 379 | pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
10297b99 | 380 | return flow ? &flow->filter_list : &p->link.filter_list; |
1da177e4 LT |
381 | } |
382 | ||
1da177e4 LT |
383 | /* --------------------------- Qdisc operations ---------------------------- */ |
384 | ||
b0188d4d | 385 | static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 386 | { |
786a9036 | 387 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 388 | struct atm_flow_data *flow = NULL; /* @@@ */ |
1da177e4 LT |
389 | struct tcf_result res; |
390 | int result; | |
391 | int ret = NET_XMIT_POLICED; | |
392 | ||
786a9036 | 393 | pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
b0188d4d | 394 | result = TC_POLICE_OK; /* be nice to gcc */ |
1da177e4 | 395 | if (TC_H_MAJ(skb->priority) != sch->handle || |
b0188d4d | 396 | !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) |
1da177e4 LT |
397 | for (flow = p->flows; flow; flow = flow->next) |
398 | if (flow->filter_list) { | |
73ca4918 PM |
399 | result = tc_classify_compat(skb, |
400 | flow->filter_list, | |
401 | &res); | |
b0188d4d PM |
402 | if (result < 0) |
403 | continue; | |
404 | flow = (struct atm_flow_data *)res.class; | |
405 | if (!flow) | |
406 | flow = lookup_flow(sch, res.classid); | |
1da177e4 LT |
407 | break; |
408 | } | |
b0188d4d PM |
409 | if (!flow) |
410 | flow = &p->link; | |
1da177e4 LT |
411 | else { |
412 | if (flow->vcc) | |
413 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; | |
b0188d4d | 414 | /*@@@ looks good ... but it's not supposed to work :-) */ |
92100804 PM |
415 | #ifdef CONFIG_NET_CLS_ACT |
416 | switch (result) { | |
417 | case TC_ACT_QUEUED: | |
418 | case TC_ACT_STOLEN: | |
419 | kfree_skb(skb); | |
378a2f09 | 420 | return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
92100804 PM |
421 | case TC_ACT_SHOT: |
422 | kfree_skb(skb); | |
423 | goto drop; | |
73ca4918 PM |
424 | case TC_POLICE_RECLASSIFY: |
425 | if (flow->excess) | |
426 | flow = flow->excess; | |
427 | else | |
428 | ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; | |
429 | break; | |
92100804 | 430 | } |
1da177e4 LT |
431 | #endif |
432 | } | |
c3bc7cff | 433 | |
5f86173b | 434 | ret = qdisc_enqueue(skb, flow->q); |
786a9036 | 435 | if (ret != 0) { |
92100804 | 436 | drop: __maybe_unused |
378a2f09 JP |
437 | if (net_xmit_drop_count(ret)) { |
438 | sch->qstats.drops++; | |
439 | if (flow) | |
440 | flow->qstats.drops++; | |
441 | } | |
1da177e4 LT |
442 | return ret; |
443 | } | |
0abf77e5 | 444 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 | 445 | sch->bstats.packets++; |
0abf77e5 | 446 | flow->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 LT |
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); | |
c27f339a | 462 | return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
463 | } |
464 | ||
1da177e4 LT |
465 | /* |
466 | * Dequeue packets and send them over ATM. Note that we quite deliberately | |
467 | * avoid checking net_device's flow control here, simply because sch_atm | |
468 | * uses its own channels, which have nothing to do with any CLIP/LANE/or | |
469 | * non-ATM interfaces. | |
470 | */ | |
471 | ||
1da177e4 LT |
472 | static void sch_atm_dequeue(unsigned long data) |
473 | { | |
b0188d4d | 474 | struct Qdisc *sch = (struct Qdisc *)data; |
786a9036 | 475 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
476 | struct atm_flow_data *flow; |
477 | struct sk_buff *skb; | |
478 | ||
786a9036 | 479 | pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
480 | for (flow = p->link.next; flow; flow = flow->next) |
481 | /* | |
482 | * If traffic is properly shaped, this won't generate nasty | |
483 | * little bursts. Otherwise, it may ... (but that's okay) | |
484 | */ | |
03c05f0d JP |
485 | while ((skb = flow->q->ops->peek(flow->q))) { |
486 | if (!atm_may_send(flow->vcc, skb->truesize)) | |
1da177e4 | 487 | break; |
03c05f0d | 488 | |
77be155c | 489 | skb = qdisc_dequeue_peeked(flow->q); |
03c05f0d JP |
490 | if (unlikely(!skb)) |
491 | break; | |
492 | ||
786a9036 | 493 | pr_debug("atm_tc_dequeue: sending on class %p\n", flow); |
1da177e4 | 494 | /* remove any LL header somebody else has attached */ |
eddc9ec5 | 495 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
496 | if (skb_headroom(skb) < flow->hdr_len) { |
497 | struct sk_buff *new; | |
498 | ||
b0188d4d | 499 | new = skb_realloc_headroom(skb, flow->hdr_len); |
1da177e4 | 500 | dev_kfree_skb(skb); |
b0188d4d PM |
501 | if (!new) |
502 | continue; | |
1da177e4 LT |
503 | skb = new; |
504 | } | |
786a9036 | 505 | pr_debug("sch_atm_dequeue: ip %p, data %p\n", |
eddc9ec5 | 506 | skb_network_header(skb), skb->data); |
1da177e4 | 507 | ATM_SKB(skb)->vcc = flow->vcc; |
b0188d4d PM |
508 | memcpy(skb_push(skb, flow->hdr_len), flow->hdr, |
509 | flow->hdr_len); | |
1da177e4 LT |
510 | atomic_add(skb->truesize, |
511 | &sk_atm(flow->vcc)->sk_wmem_alloc); | |
512 | /* atm.atm_options are already set by atm_tc_enqueue */ | |
b0188d4d | 513 | flow->vcc->send(flow->vcc, skb); |
1da177e4 LT |
514 | } |
515 | } | |
516 | ||
1da177e4 LT |
517 | static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
518 | { | |
786a9036 | 519 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
520 | struct sk_buff *skb; |
521 | ||
786a9036 | 522 | pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 | 523 | tasklet_schedule(&p->task); |
77be155c | 524 | skb = qdisc_dequeue_peeked(p->link.q); |
b0188d4d PM |
525 | if (skb) |
526 | sch->q.qlen--; | |
1da177e4 LT |
527 | return skb; |
528 | } | |
529 | ||
8e3af978 JP |
530 | static struct sk_buff *atm_tc_peek(struct Qdisc *sch) |
531 | { | |
532 | struct atm_qdisc_data *p = qdisc_priv(sch); | |
533 | ||
534 | pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p); | |
535 | ||
536 | return p->link.q->ops->peek(p->link.q); | |
537 | } | |
538 | ||
1da177e4 LT |
539 | static unsigned int atm_tc_drop(struct Qdisc *sch) |
540 | { | |
786a9036 | 541 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
542 | struct atm_flow_data *flow; |
543 | unsigned int len; | |
544 | ||
786a9036 | 545 | pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 LT |
546 | for (flow = p->flows; flow; flow = flow->next) |
547 | if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q))) | |
548 | return len; | |
549 | return 0; | |
550 | } | |
551 | ||
1e90474c | 552 | static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 553 | { |
786a9036 | 554 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 | 555 | |
786a9036 | 556 | pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
1da177e4 | 557 | p->flows = &p->link; |
5ce2d488 | 558 | p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 559 | &pfifo_qdisc_ops, sch->handle); |
786a9036 | 560 | if (!p->link.q) |
1da177e4 | 561 | p->link.q = &noop_qdisc; |
786a9036 | 562 | pr_debug("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 | { | |
786a9036 | 575 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
576 | struct atm_flow_data *flow; |
577 | ||
786a9036 | 578 | pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
b0188d4d PM |
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 | { | |
786a9036 | 586 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
587 | struct atm_flow_data *flow; |
588 | ||
786a9036 | 589 | pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
a4aebb83 PM |
590 | for (flow = p->flows; flow; flow = flow->next) |
591 | tcf_destroy_chain(&flow->filter_list); | |
592 | ||
1da177e4 LT |
593 | /* races ? */ |
594 | while ((flow = p->flows)) { | |
1da177e4 | 595 | if (flow->ref > 1) |
b0188d4d PM |
596 | printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow, |
597 | flow->ref); | |
598 | atm_tc_put(sch, (unsigned long)flow); | |
1da177e4 LT |
599 | if (p->flows == flow) { |
600 | printk(KERN_ERR "atm_destroy: putting flow %p didn't " | |
b0188d4d PM |
601 | "kill it\n", flow); |
602 | p->flows = flow->next; /* brute force */ | |
1da177e4 LT |
603 | break; |
604 | } | |
605 | } | |
606 | tasklet_kill(&p->task); | |
607 | } | |
608 | ||
1da177e4 | 609 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
b0188d4d | 610 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 | 611 | { |
786a9036 | 612 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 613 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
4b3550ef | 614 | struct nlattr *nest; |
1da177e4 | 615 | |
786a9036 | 616 | pr_debug("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; |
4b3550ef PM |
622 | |
623 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
624 | if (nest == NULL) | |
625 | goto nla_put_failure; | |
626 | ||
1e90474c | 627 | NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr); |
1da177e4 LT |
628 | if (flow->vcc) { |
629 | struct sockaddr_atmpvc pvc; | |
630 | int state; | |
631 | ||
632 | pvc.sap_family = AF_ATMPVC; | |
633 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; | |
634 | pvc.sap_addr.vpi = flow->vcc->vpi; | |
635 | pvc.sap_addr.vci = flow->vcc->vci; | |
1e90474c | 636 | NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc); |
1da177e4 | 637 | state = ATM_VF2VS(flow->vcc->flags); |
24beeab5 | 638 | NLA_PUT_U32(skb, TCA_ATM_STATE, state); |
1da177e4 LT |
639 | } |
640 | if (flow->excess) | |
24beeab5 | 641 | NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid); |
1da177e4 | 642 | else { |
24beeab5 | 643 | NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0); |
1da177e4 | 644 | } |
4b3550ef PM |
645 | |
646 | nla_nest_end(skb, nest); | |
1da177e4 LT |
647 | return skb->len; |
648 | ||
1e90474c | 649 | nla_put_failure: |
4b3550ef | 650 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
651 | return -1; |
652 | } | |
653 | static int | |
654 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
b0188d4d | 655 | struct gnet_dump *d) |
1da177e4 | 656 | { |
b0188d4d | 657 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 LT |
658 | |
659 | flow->qstats.qlen = flow->q->q.qlen; | |
660 | ||
661 | if (gnet_stats_copy_basic(d, &flow->bstats) < 0 || | |
662 | gnet_stats_copy_queue(d, &flow->qstats) < 0) | |
663 | return -1; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) | |
669 | { | |
670 | return 0; | |
671 | } | |
672 | ||
20fea08b | 673 | static const struct Qdisc_class_ops atm_class_ops = { |
b0188d4d PM |
674 | .graft = atm_tc_graft, |
675 | .leaf = atm_tc_leaf, | |
676 | .get = atm_tc_get, | |
677 | .put = atm_tc_put, | |
678 | .change = atm_tc_change, | |
679 | .delete = atm_tc_delete, | |
680 | .walk = atm_tc_walk, | |
681 | .tcf_chain = atm_tc_find_tcf, | |
682 | .bind_tcf = atm_tc_bind_filter, | |
683 | .unbind_tcf = atm_tc_put, | |
684 | .dump = atm_tc_dump_class, | |
685 | .dump_stats = atm_tc_dump_class_stats, | |
1da177e4 LT |
686 | }; |
687 | ||
20fea08b | 688 | static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
b0188d4d PM |
689 | .cl_ops = &atm_class_ops, |
690 | .id = "atm", | |
691 | .priv_size = sizeof(struct atm_qdisc_data), | |
692 | .enqueue = atm_tc_enqueue, | |
693 | .dequeue = atm_tc_dequeue, | |
8e3af978 | 694 | .peek = atm_tc_peek, |
b0188d4d PM |
695 | .drop = atm_tc_drop, |
696 | .init = atm_tc_init, | |
697 | .reset = atm_tc_reset, | |
698 | .destroy = atm_tc_destroy, | |
699 | .dump = atm_tc_dump, | |
700 | .owner = THIS_MODULE, | |
1da177e4 LT |
701 | }; |
702 | ||
1da177e4 LT |
703 | static int __init atm_init(void) |
704 | { | |
705 | return register_qdisc(&atm_qdisc_ops); | |
706 | } | |
707 | ||
10297b99 | 708 | static void __exit atm_exit(void) |
1da177e4 LT |
709 | { |
710 | unregister_qdisc(&atm_qdisc_ops); | |
711 | } | |
712 | ||
713 | module_init(atm_init) | |
714 | module_exit(atm_exit) | |
715 | MODULE_LICENSE("GPL"); |