Commit | Line | Data |
---|---|---|
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); |
ff31ab56 | 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 | 197 | |
27a3421e PM |
198 | static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = { |
199 | [TCA_ATM_FD] = { .type = NLA_U32 }, | |
200 | [TCA_ATM_EXCESS] = { .type = NLA_U32 }, | |
201 | }; | |
202 | ||
1da177e4 | 203 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
1e90474c | 204 | struct nlattr **tca, unsigned long *arg) |
1da177e4 | 205 | { |
786a9036 | 206 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 207 | struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
1da177e4 | 208 | struct atm_flow_data *excess = NULL; |
1e90474c PM |
209 | struct nlattr *opt = tca[TCA_OPTIONS]; |
210 | struct nlattr *tb[TCA_ATM_MAX + 1]; | |
1da177e4 | 211 | struct socket *sock; |
b0188d4d | 212 | int fd, error, hdr_len; |
1da177e4 LT |
213 | void *hdr; |
214 | ||
786a9036 | 215 | pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
b0188d4d | 216 | "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
1da177e4 LT |
217 | /* |
218 | * The concept of parents doesn't apply for this qdisc. | |
219 | */ | |
220 | if (parent && parent != TC_H_ROOT && parent != sch->handle) | |
221 | return -EINVAL; | |
222 | /* | |
223 | * ATM classes cannot be changed. In order to change properties of the | |
224 | * ATM connection, that socket needs to be modified directly (via the | |
225 | * native ATM API. In order to send a flow to a different VC, the old | |
226 | * class needs to be removed and a new one added. (This may be changed | |
227 | * later.) | |
228 | */ | |
b0188d4d PM |
229 | if (flow) |
230 | return -EBUSY; | |
cee63723 | 231 | if (opt == NULL) |
1da177e4 | 232 | return -EINVAL; |
27a3421e PM |
233 | |
234 | error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy); | |
cee63723 PM |
235 | if (error < 0) |
236 | return error; | |
237 | ||
27a3421e | 238 | if (!tb[TCA_ATM_FD]) |
1da177e4 | 239 | return -EINVAL; |
1587bac4 | 240 | fd = nla_get_u32(tb[TCA_ATM_FD]); |
786a9036 | 241 | pr_debug("atm_tc_change: fd %d\n", fd); |
1e90474c PM |
242 | if (tb[TCA_ATM_HDR]) { |
243 | hdr_len = nla_len(tb[TCA_ATM_HDR]); | |
244 | hdr = nla_data(tb[TCA_ATM_HDR]); | |
b0188d4d | 245 | } else { |
1da177e4 | 246 | hdr_len = RFC1483LLC_LEN; |
b0188d4d | 247 | hdr = NULL; /* default LLC/SNAP for IP */ |
1da177e4 | 248 | } |
1e90474c | 249 | if (!tb[TCA_ATM_EXCESS]) |
b0188d4d | 250 | excess = NULL; |
1da177e4 | 251 | else { |
b0188d4d | 252 | excess = (struct atm_flow_data *) |
1587bac4 | 253 | atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS])); |
b0188d4d PM |
254 | if (!excess) |
255 | return -ENOENT; | |
1da177e4 | 256 | } |
f5e5cb75 | 257 | pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
1e90474c | 258 | opt->nla_type, nla_len(opt), hdr_len); |
786a9036 SH |
259 | sock = sockfd_lookup(fd, &error); |
260 | if (!sock) | |
b0188d4d | 261 | return error; /* f_count++ */ |
786a9036 | 262 | pr_debug("atm_tc_change: f_count %d\n", file_count(sock->file)); |
10297b99 | 263 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
1da177e4 | 264 | error = -EPROTOTYPE; |
10297b99 | 265 | goto err_out; |
1da177e4 LT |
266 | } |
267 | /* @@@ should check if the socket is really operational or we'll crash | |
268 | on vcc->send */ | |
269 | if (classid) { | |
270 | if (TC_H_MAJ(classid ^ sch->handle)) { | |
786a9036 | 271 | pr_debug("atm_tc_change: classid mismatch\n"); |
1da177e4 LT |
272 | error = -EINVAL; |
273 | goto err_out; | |
274 | } | |
b0188d4d | 275 | if (find_flow(p, flow)) { |
1da177e4 LT |
276 | error = -EEXIST; |
277 | goto err_out; | |
278 | } | |
b0188d4d | 279 | } else { |
1da177e4 LT |
280 | int i; |
281 | unsigned long cl; | |
282 | ||
283 | for (i = 1; i < 0x8000; i++) { | |
b0188d4d | 284 | classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
786a9036 SH |
285 | cl = atm_tc_get(sch, classid); |
286 | if (!cl) | |
b0188d4d PM |
287 | break; |
288 | atm_tc_put(sch, cl); | |
1da177e4 LT |
289 | } |
290 | } | |
786a9036 | 291 | pr_debug("atm_tc_change: new id %x\n", classid); |
782f7956 | 292 | flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
786a9036 | 293 | pr_debug("atm_tc_change: flow %p\n", flow); |
1da177e4 LT |
294 | if (!flow) { |
295 | error = -ENOBUFS; | |
296 | goto err_out; | |
297 | } | |
1da177e4 | 298 | flow->filter_list = NULL; |
5ce2d488 | 299 | flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 300 | &pfifo_qdisc_ops, classid); |
786a9036 | 301 | if (!flow->q) |
1da177e4 | 302 | flow->q = &noop_qdisc; |
786a9036 | 303 | pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
1da177e4 | 304 | flow->sock = sock; |
b0188d4d | 305 | flow->vcc = ATM_SD(sock); /* speedup */ |
1da177e4 | 306 | flow->vcc->user_back = flow; |
786a9036 | 307 | pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
1da177e4 LT |
308 | flow->old_pop = flow->vcc->pop; |
309 | flow->parent = p; | |
310 | flow->vcc->pop = sch_atm_pop; | |
311 | flow->classid = classid; | |
312 | flow->ref = 1; | |
313 | flow->excess = excess; | |
314 | flow->next = p->link.next; | |
315 | p->link.next = flow; | |
316 | flow->hdr_len = hdr_len; | |
317 | if (hdr) | |
b0188d4d | 318 | memcpy(flow->hdr, hdr, hdr_len); |
1da177e4 | 319 | else |
b0188d4d PM |
320 | memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
321 | *arg = (unsigned long)flow; | |
1da177e4 LT |
322 | return 0; |
323 | err_out: | |
b0188d4d PM |
324 | if (excess) |
325 | atm_tc_put(sch, (unsigned long)excess); | |
1da177e4 LT |
326 | sockfd_put(sock); |
327 | return error; | |
328 | } | |
329 | ||
b0188d4d | 330 | static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
1da177e4 | 331 | { |
786a9036 | 332 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 333 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 334 | |
786a9036 SH |
335 | pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
336 | if (!find_flow(qdisc_priv(sch), flow)) | |
b0188d4d PM |
337 | return -EINVAL; |
338 | if (flow->filter_list || flow == &p->link) | |
339 | return -EBUSY; | |
1da177e4 LT |
340 | /* |
341 | * Reference count must be 2: one for "keepalive" (set at class | |
342 | * creation), and one for the reference held when calling delete. | |
343 | */ | |
344 | if (flow->ref < 2) { | |
b0188d4d | 345 | printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref); |
1da177e4 LT |
346 | return -EINVAL; |
347 | } | |
b0188d4d PM |
348 | if (flow->ref > 2) |
349 | return -EBUSY; /* catch references via excess, etc. */ | |
350 | atm_tc_put(sch, arg); | |
1da177e4 LT |
351 | return 0; |
352 | } | |
353 | ||
b0188d4d | 354 | static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 | 355 | { |
786a9036 | 356 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
357 | struct atm_flow_data *flow; |
358 | ||
786a9036 | 359 | pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
b0188d4d PM |
360 | if (walker->stop) |
361 | return; | |
1da177e4 LT |
362 | for (flow = p->flows; flow; flow = flow->next) { |
363 | if (walker->count >= walker->skip) | |
b0188d4d | 364 | if (walker->fn(sch, (unsigned long)flow, walker) < 0) { |
1da177e4 LT |
365 | walker->stop = 1; |
366 | break; | |
367 | } | |
368 | walker->count++; | |
369 | } | |
370 | } | |
371 | ||
b0188d4d | 372 | static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 373 | { |
786a9036 | 374 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 375 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 376 | |
786a9036 | 377 | pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
10297b99 | 378 | return flow ? &flow->filter_list : &p->link.filter_list; |
1da177e4 LT |
379 | } |
380 | ||
1da177e4 LT |
381 | /* --------------------------- Qdisc operations ---------------------------- */ |
382 | ||
b0188d4d | 383 | static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 384 | { |
786a9036 | 385 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 386 | struct atm_flow_data *flow = NULL; /* @@@ */ |
1da177e4 LT |
387 | struct tcf_result res; |
388 | int result; | |
389 | int ret = NET_XMIT_POLICED; | |
390 | ||
786a9036 | 391 | pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
b0188d4d | 392 | result = TC_POLICE_OK; /* be nice to gcc */ |
1da177e4 | 393 | if (TC_H_MAJ(skb->priority) != sch->handle || |
b0188d4d | 394 | !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) |
1da177e4 LT |
395 | for (flow = p->flows; flow; flow = flow->next) |
396 | if (flow->filter_list) { | |
73ca4918 PM |
397 | result = tc_classify_compat(skb, |
398 | flow->filter_list, | |
399 | &res); | |
b0188d4d PM |
400 | if (result < 0) |
401 | continue; | |
402 | flow = (struct atm_flow_data *)res.class; | |
403 | if (!flow) | |
404 | flow = lookup_flow(sch, res.classid); | |
1da177e4 LT |
405 | break; |
406 | } | |
b0188d4d PM |
407 | if (!flow) |
408 | flow = &p->link; | |
1da177e4 LT |
409 | else { |
410 | if (flow->vcc) | |
411 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; | |
b0188d4d | 412 | /*@@@ looks good ... but it's not supposed to work :-) */ |
92100804 PM |
413 | #ifdef CONFIG_NET_CLS_ACT |
414 | switch (result) { | |
415 | case TC_ACT_QUEUED: | |
416 | case TC_ACT_STOLEN: | |
417 | kfree_skb(skb); | |
418 | return NET_XMIT_SUCCESS; | |
419 | case TC_ACT_SHOT: | |
420 | kfree_skb(skb); | |
421 | goto drop; | |
73ca4918 PM |
422 | case TC_POLICE_RECLASSIFY: |
423 | if (flow->excess) | |
424 | flow = flow->excess; | |
425 | else | |
426 | ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; | |
427 | break; | |
92100804 | 428 | } |
1da177e4 LT |
429 | #endif |
430 | } | |
c3bc7cff | 431 | |
5f86173b | 432 | ret = qdisc_enqueue(skb, flow->q); |
786a9036 | 433 | if (ret != 0) { |
92100804 | 434 | drop: __maybe_unused |
1da177e4 | 435 | sch->qstats.drops++; |
b0188d4d PM |
436 | if (flow) |
437 | flow->qstats.drops++; | |
1da177e4 LT |
438 | return ret; |
439 | } | |
0abf77e5 | 440 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 | 441 | sch->bstats.packets++; |
0abf77e5 | 442 | flow->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 LT |
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; |
786a9036 | 471 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
472 | struct atm_flow_data *flow; |
473 | struct sk_buff *skb; | |
474 | ||
786a9036 | 475 | pr_debug("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 | } | |
786a9036 | 486 | pr_debug("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 | } | |
786a9036 | 498 | pr_debug("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 | { | |
786a9036 | 512 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
513 | struct sk_buff *skb; |
514 | ||
786a9036 | 515 | pr_debug("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 | 524 | { |
786a9036 | 525 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
526 | int ret; |
527 | ||
786a9036 | 528 | pr_debug("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
b0188d4d | 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 | { | |
786a9036 | 542 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
543 | struct atm_flow_data *flow; |
544 | unsigned int len; | |
545 | ||
786a9036 | 546 | pr_debug("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 | ||
1e90474c | 553 | static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 554 | { |
786a9036 | 555 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 | 556 | |
786a9036 | 557 | pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
1da177e4 | 558 | p->flows = &p->link; |
5ce2d488 | 559 | p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 560 | &pfifo_qdisc_ops, sch->handle); |
786a9036 | 561 | if (!p->link.q) |
1da177e4 | 562 | p->link.q = &noop_qdisc; |
786a9036 | 563 | pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
1da177e4 LT |
564 | p->link.filter_list = NULL; |
565 | p->link.vcc = NULL; | |
566 | p->link.sock = NULL; | |
567 | p->link.classid = sch->handle; | |
568 | p->link.ref = 1; | |
569 | p->link.next = NULL; | |
b0188d4d | 570 | tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); |
1da177e4 LT |
571 | return 0; |
572 | } | |
573 | ||
1da177e4 LT |
574 | static void atm_tc_reset(struct Qdisc *sch) |
575 | { | |
786a9036 | 576 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
577 | struct atm_flow_data *flow; |
578 | ||
786a9036 | 579 | pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
b0188d4d PM |
580 | for (flow = p->flows; flow; flow = flow->next) |
581 | qdisc_reset(flow->q); | |
1da177e4 LT |
582 | sch->q.qlen = 0; |
583 | } | |
584 | ||
1da177e4 LT |
585 | static void atm_tc_destroy(struct Qdisc *sch) |
586 | { | |
786a9036 | 587 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
588 | struct atm_flow_data *flow; |
589 | ||
786a9036 | 590 | pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
a4aebb83 PM |
591 | for (flow = p->flows; flow; flow = flow->next) |
592 | tcf_destroy_chain(&flow->filter_list); | |
593 | ||
1da177e4 LT |
594 | /* races ? */ |
595 | while ((flow = p->flows)) { | |
1da177e4 | 596 | if (flow->ref > 1) |
b0188d4d PM |
597 | printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow, |
598 | flow->ref); | |
599 | atm_tc_put(sch, (unsigned long)flow); | |
1da177e4 LT |
600 | if (p->flows == flow) { |
601 | printk(KERN_ERR "atm_destroy: putting flow %p didn't " | |
b0188d4d PM |
602 | "kill it\n", flow); |
603 | p->flows = flow->next; /* brute force */ | |
1da177e4 LT |
604 | break; |
605 | } | |
606 | } | |
607 | tasklet_kill(&p->task); | |
608 | } | |
609 | ||
1da177e4 | 610 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
b0188d4d | 611 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 | 612 | { |
786a9036 | 613 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 614 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
4b3550ef | 615 | struct nlattr *nest; |
1da177e4 | 616 | |
786a9036 | 617 | pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
b0188d4d PM |
618 | sch, p, flow, skb, tcm); |
619 | if (!find_flow(p, flow)) | |
620 | return -EINVAL; | |
1da177e4 | 621 | tcm->tcm_handle = flow->classid; |
cdc7f8e3 | 622 | tcm->tcm_info = flow->q->handle; |
4b3550ef PM |
623 | |
624 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
625 | if (nest == NULL) | |
626 | goto nla_put_failure; | |
627 | ||
1e90474c | 628 | NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr); |
1da177e4 LT |
629 | if (flow->vcc) { |
630 | struct sockaddr_atmpvc pvc; | |
631 | int state; | |
632 | ||
633 | pvc.sap_family = AF_ATMPVC; | |
634 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; | |
635 | pvc.sap_addr.vpi = flow->vcc->vpi; | |
636 | pvc.sap_addr.vci = flow->vcc->vci; | |
1e90474c | 637 | NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc); |
1da177e4 | 638 | state = ATM_VF2VS(flow->vcc->flags); |
24beeab5 | 639 | NLA_PUT_U32(skb, TCA_ATM_STATE, state); |
1da177e4 LT |
640 | } |
641 | if (flow->excess) | |
24beeab5 | 642 | NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid); |
1da177e4 | 643 | else { |
24beeab5 | 644 | NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0); |
1da177e4 | 645 | } |
4b3550ef PM |
646 | |
647 | nla_nest_end(skb, nest); | |
1da177e4 LT |
648 | return skb->len; |
649 | ||
1e90474c | 650 | nla_put_failure: |
4b3550ef | 651 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
652 | return -1; |
653 | } | |
654 | static int | |
655 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
b0188d4d | 656 | struct gnet_dump *d) |
1da177e4 | 657 | { |
b0188d4d | 658 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 LT |
659 | |
660 | flow->qstats.qlen = flow->q->q.qlen; | |
661 | ||
662 | if (gnet_stats_copy_basic(d, &flow->bstats) < 0 || | |
663 | gnet_stats_copy_queue(d, &flow->qstats) < 0) | |
664 | return -1; | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) | |
670 | { | |
671 | return 0; | |
672 | } | |
673 | ||
20fea08b | 674 | static const struct Qdisc_class_ops atm_class_ops = { |
b0188d4d PM |
675 | .graft = atm_tc_graft, |
676 | .leaf = atm_tc_leaf, | |
677 | .get = atm_tc_get, | |
678 | .put = atm_tc_put, | |
679 | .change = atm_tc_change, | |
680 | .delete = atm_tc_delete, | |
681 | .walk = atm_tc_walk, | |
682 | .tcf_chain = atm_tc_find_tcf, | |
683 | .bind_tcf = atm_tc_bind_filter, | |
684 | .unbind_tcf = atm_tc_put, | |
685 | .dump = atm_tc_dump_class, | |
686 | .dump_stats = atm_tc_dump_class_stats, | |
1da177e4 LT |
687 | }; |
688 | ||
20fea08b | 689 | static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
b0188d4d PM |
690 | .cl_ops = &atm_class_ops, |
691 | .id = "atm", | |
692 | .priv_size = sizeof(struct atm_qdisc_data), | |
693 | .enqueue = atm_tc_enqueue, | |
694 | .dequeue = atm_tc_dequeue, | |
695 | .requeue = atm_tc_requeue, | |
696 | .drop = atm_tc_drop, | |
697 | .init = atm_tc_init, | |
698 | .reset = atm_tc_reset, | |
699 | .destroy = atm_tc_destroy, | |
700 | .dump = atm_tc_dump, | |
701 | .owner = THIS_MODULE, | |
1da177e4 LT |
702 | }; |
703 | ||
1da177e4 LT |
704 | static int __init atm_init(void) |
705 | { | |
706 | return register_qdisc(&atm_qdisc_ops); | |
707 | } | |
708 | ||
10297b99 | 709 | static void __exit atm_exit(void) |
1da177e4 LT |
710 | { |
711 | unregister_qdisc(&atm_qdisc_ops); | |
712 | } | |
713 | ||
714 | module_init(atm_init) | |
715 | module_exit(atm_exit) | |
716 | MODULE_LICENSE("GPL"); |