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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 | 7 | #include <linux/init.h> |
a6b7a407 | 8 | #include <linux/interrupt.h> |
1da177e4 LT |
9 | #include <linux/string.h> |
10 | #include <linux/errno.h> | |
11 | #include <linux/skbuff.h> | |
1da177e4 LT |
12 | #include <linux/atmdev.h> |
13 | #include <linux/atmclip.h> | |
1da177e4 | 14 | #include <linux/rtnetlink.h> |
b0188d4d | 15 | #include <linux/file.h> /* for fput */ |
dc5fc579 | 16 | #include <net/netlink.h> |
1da177e4 | 17 | #include <net/pkt_sched.h> |
cf1facda | 18 | #include <net/pkt_cls.h> |
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. */ |
25d8c0d5 | 45 | struct tcf_proto __rcu *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; |
6accec76 | 55 | struct list_head list; |
1da177e4 LT |
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 */ | |
6accec76 | 64 | struct list_head flows; /* NB: "link" is also on this |
1da177e4 | 65 | list */ |
f30ab418 | 66 | struct tasklet_struct task; /* dequeue tasklet */ |
1da177e4 LT |
67 | }; |
68 | ||
1da177e4 LT |
69 | /* ------------------------- Class/flow operations ------------------------- */ |
70 | ||
b0188d4d | 71 | static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
1da177e4 | 72 | { |
786a9036 | 73 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
74 | struct atm_flow_data *flow; |
75 | ||
6accec76 | 76 | list_for_each_entry(flow, &p->flows, list) { |
b0188d4d | 77 | if (flow->classid == classid) |
6accec76 DM |
78 | return flow; |
79 | } | |
80 | return NULL; | |
1da177e4 LT |
81 | } |
82 | ||
b0188d4d PM |
83 | static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
84 | struct Qdisc *new, struct Qdisc **old) | |
1da177e4 | 85 | { |
786a9036 | 86 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d PM |
87 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
88 | ||
786a9036 | 89 | pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", |
b0188d4d | 90 | sch, p, flow, new, old); |
6accec76 | 91 | if (list_empty(&flow->list)) |
b0188d4d PM |
92 | return -EINVAL; |
93 | if (!new) | |
94 | new = &noop_qdisc; | |
b94c8afc PM |
95 | *old = flow->q; |
96 | flow->q = new; | |
b0188d4d PM |
97 | if (*old) |
98 | qdisc_reset(*old); | |
10297b99 | 99 | return 0; |
1da177e4 LT |
100 | } |
101 | ||
b0188d4d | 102 | static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 103 | { |
b0188d4d | 104 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 105 | |
786a9036 | 106 | pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
1da177e4 LT |
107 | return flow ? flow->q : NULL; |
108 | } | |
109 | ||
b0188d4d | 110 | static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid) |
1da177e4 | 111 | { |
786a9036 | 112 | struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
1da177e4 LT |
113 | struct atm_flow_data *flow; |
114 | ||
786a9036 | 115 | pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); |
b0188d4d PM |
116 | flow = lookup_flow(sch, classid); |
117 | if (flow) | |
118 | flow->ref++; | |
786a9036 | 119 | pr_debug("atm_tc_get: flow %p\n", flow); |
b0188d4d | 120 | return (unsigned long)flow; |
1da177e4 LT |
121 | } |
122 | ||
1da177e4 | 123 | static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
b0188d4d | 124 | unsigned long parent, u32 classid) |
1da177e4 | 125 | { |
b0188d4d | 126 | return atm_tc_get(sch, classid); |
1da177e4 LT |
127 | } |
128 | ||
1da177e4 LT |
129 | /* |
130 | * atm_tc_put handles all destructions, including the ones that are explicitly | |
131 | * requested (atm_tc_destroy, etc.). The assumption here is that we never drop | |
132 | * anything that still seems to be in use. | |
133 | */ | |
1da177e4 LT |
134 | static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
135 | { | |
786a9036 | 136 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 137 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 138 | |
786a9036 | 139 | pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
b0188d4d PM |
140 | if (--flow->ref) |
141 | return; | |
786a9036 | 142 | pr_debug("atm_tc_put: destroying\n"); |
6accec76 | 143 | list_del_init(&flow->list); |
786a9036 | 144 | pr_debug("atm_tc_put: qdisc %p\n", flow->q); |
1da177e4 | 145 | qdisc_destroy(flow->q); |
ff31ab56 | 146 | tcf_destroy_chain(&flow->filter_list); |
1da177e4 | 147 | if (flow->sock) { |
516e0cc5 | 148 | pr_debug("atm_tc_put: f_count %ld\n", |
b0188d4d | 149 | file_count(flow->sock->file)); |
1da177e4 LT |
150 | flow->vcc->pop = flow->old_pop; |
151 | sockfd_put(flow->sock); | |
152 | } | |
b0188d4d PM |
153 | if (flow->excess) |
154 | atm_tc_put(sch, (unsigned long)flow->excess); | |
155 | if (flow != &p->link) | |
156 | kfree(flow); | |
1da177e4 LT |
157 | /* |
158 | * If flow == &p->link, the qdisc no longer works at this point and | |
159 | * needs to be removed. (By the caller of atm_tc_put.) | |
160 | */ | |
161 | } | |
162 | ||
b0188d4d | 163 | static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
164 | { |
165 | struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; | |
166 | ||
786a9036 | 167 | pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
b0188d4d | 168 | VCC2FLOW(vcc)->old_pop(vcc, skb); |
1da177e4 LT |
169 | tasklet_schedule(&p->task); |
170 | } | |
171 | ||
172 | static const u8 llc_oui_ip[] = { | |
b0188d4d PM |
173 | 0xaa, /* DSAP: non-ISO */ |
174 | 0xaa, /* SSAP: non-ISO */ | |
175 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
176 | 0x00, /* OUI: EtherType */ | |
1da177e4 | 177 | 0x00, 0x00, |
b0188d4d PM |
178 | 0x08, 0x00 |
179 | }; /* Ethertype IP (0800) */ | |
1da177e4 | 180 | |
27a3421e PM |
181 | static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = { |
182 | [TCA_ATM_FD] = { .type = NLA_U32 }, | |
183 | [TCA_ATM_EXCESS] = { .type = NLA_U32 }, | |
184 | }; | |
185 | ||
1da177e4 | 186 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
1e90474c | 187 | struct nlattr **tca, unsigned long *arg) |
1da177e4 | 188 | { |
786a9036 | 189 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 190 | struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
1da177e4 | 191 | struct atm_flow_data *excess = NULL; |
1e90474c PM |
192 | struct nlattr *opt = tca[TCA_OPTIONS]; |
193 | struct nlattr *tb[TCA_ATM_MAX + 1]; | |
1da177e4 | 194 | struct socket *sock; |
b0188d4d | 195 | int fd, error, hdr_len; |
1da177e4 LT |
196 | void *hdr; |
197 | ||
786a9036 | 198 | pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
b0188d4d | 199 | "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
1da177e4 LT |
200 | /* |
201 | * The concept of parents doesn't apply for this qdisc. | |
202 | */ | |
203 | if (parent && parent != TC_H_ROOT && parent != sch->handle) | |
204 | return -EINVAL; | |
205 | /* | |
206 | * ATM classes cannot be changed. In order to change properties of the | |
207 | * ATM connection, that socket needs to be modified directly (via the | |
208 | * native ATM API. In order to send a flow to a different VC, the old | |
209 | * class needs to be removed and a new one added. (This may be changed | |
210 | * later.) | |
211 | */ | |
b0188d4d PM |
212 | if (flow) |
213 | return -EBUSY; | |
cee63723 | 214 | if (opt == NULL) |
1da177e4 | 215 | return -EINVAL; |
27a3421e | 216 | |
fceb6435 | 217 | error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy, NULL); |
cee63723 PM |
218 | if (error < 0) |
219 | return error; | |
220 | ||
27a3421e | 221 | if (!tb[TCA_ATM_FD]) |
1da177e4 | 222 | return -EINVAL; |
1587bac4 | 223 | fd = nla_get_u32(tb[TCA_ATM_FD]); |
786a9036 | 224 | pr_debug("atm_tc_change: fd %d\n", fd); |
1e90474c PM |
225 | if (tb[TCA_ATM_HDR]) { |
226 | hdr_len = nla_len(tb[TCA_ATM_HDR]); | |
227 | hdr = nla_data(tb[TCA_ATM_HDR]); | |
b0188d4d | 228 | } else { |
1da177e4 | 229 | hdr_len = RFC1483LLC_LEN; |
b0188d4d | 230 | hdr = NULL; /* default LLC/SNAP for IP */ |
1da177e4 | 231 | } |
1e90474c | 232 | if (!tb[TCA_ATM_EXCESS]) |
b0188d4d | 233 | excess = NULL; |
1da177e4 | 234 | else { |
b0188d4d | 235 | excess = (struct atm_flow_data *) |
1587bac4 | 236 | atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS])); |
b0188d4d PM |
237 | if (!excess) |
238 | return -ENOENT; | |
1da177e4 | 239 | } |
f5e5cb75 | 240 | pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
1e90474c | 241 | opt->nla_type, nla_len(opt), hdr_len); |
786a9036 SH |
242 | sock = sockfd_lookup(fd, &error); |
243 | if (!sock) | |
b0188d4d | 244 | return error; /* f_count++ */ |
516e0cc5 | 245 | pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file)); |
10297b99 | 246 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
1da177e4 | 247 | error = -EPROTOTYPE; |
10297b99 | 248 | goto err_out; |
1da177e4 LT |
249 | } |
250 | /* @@@ should check if the socket is really operational or we'll crash | |
251 | on vcc->send */ | |
252 | if (classid) { | |
253 | if (TC_H_MAJ(classid ^ sch->handle)) { | |
786a9036 | 254 | pr_debug("atm_tc_change: classid mismatch\n"); |
1da177e4 LT |
255 | error = -EINVAL; |
256 | goto err_out; | |
257 | } | |
b0188d4d | 258 | } else { |
1da177e4 LT |
259 | int i; |
260 | unsigned long cl; | |
261 | ||
262 | for (i = 1; i < 0x8000; i++) { | |
b0188d4d | 263 | classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
786a9036 SH |
264 | cl = atm_tc_get(sch, classid); |
265 | if (!cl) | |
b0188d4d PM |
266 | break; |
267 | atm_tc_put(sch, cl); | |
1da177e4 LT |
268 | } |
269 | } | |
786a9036 | 270 | pr_debug("atm_tc_change: new id %x\n", classid); |
782f7956 | 271 | flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
786a9036 | 272 | pr_debug("atm_tc_change: flow %p\n", flow); |
1da177e4 LT |
273 | if (!flow) { |
274 | error = -ENOBUFS; | |
275 | goto err_out; | |
276 | } | |
25d8c0d5 | 277 | RCU_INIT_POINTER(flow->filter_list, NULL); |
3511c913 | 278 | flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid); |
786a9036 | 279 | if (!flow->q) |
1da177e4 | 280 | flow->q = &noop_qdisc; |
786a9036 | 281 | pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
1da177e4 | 282 | flow->sock = sock; |
b0188d4d | 283 | flow->vcc = ATM_SD(sock); /* speedup */ |
1da177e4 | 284 | flow->vcc->user_back = flow; |
786a9036 | 285 | pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
1da177e4 LT |
286 | flow->old_pop = flow->vcc->pop; |
287 | flow->parent = p; | |
288 | flow->vcc->pop = sch_atm_pop; | |
289 | flow->classid = classid; | |
290 | flow->ref = 1; | |
291 | flow->excess = excess; | |
6accec76 | 292 | list_add(&flow->list, &p->link.list); |
1da177e4 LT |
293 | flow->hdr_len = hdr_len; |
294 | if (hdr) | |
b0188d4d | 295 | memcpy(flow->hdr, hdr, hdr_len); |
1da177e4 | 296 | else |
b0188d4d PM |
297 | memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
298 | *arg = (unsigned long)flow; | |
1da177e4 LT |
299 | return 0; |
300 | err_out: | |
b0188d4d PM |
301 | if (excess) |
302 | atm_tc_put(sch, (unsigned long)excess); | |
1da177e4 LT |
303 | sockfd_put(sock); |
304 | return error; | |
305 | } | |
306 | ||
b0188d4d | 307 | static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
1da177e4 | 308 | { |
786a9036 | 309 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 310 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 311 | |
786a9036 | 312 | pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
6accec76 | 313 | if (list_empty(&flow->list)) |
b0188d4d | 314 | return -EINVAL; |
25d8c0d5 | 315 | if (rcu_access_pointer(flow->filter_list) || flow == &p->link) |
b0188d4d | 316 | return -EBUSY; |
1da177e4 LT |
317 | /* |
318 | * Reference count must be 2: one for "keepalive" (set at class | |
319 | * creation), and one for the reference held when calling delete. | |
320 | */ | |
321 | if (flow->ref < 2) { | |
cc7ec456 | 322 | pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref); |
1da177e4 LT |
323 | return -EINVAL; |
324 | } | |
b0188d4d PM |
325 | if (flow->ref > 2) |
326 | return -EBUSY; /* catch references via excess, etc. */ | |
327 | atm_tc_put(sch, arg); | |
1da177e4 LT |
328 | return 0; |
329 | } | |
330 | ||
b0188d4d | 331 | static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 | 332 | { |
786a9036 | 333 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
334 | struct atm_flow_data *flow; |
335 | ||
786a9036 | 336 | pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
b0188d4d PM |
337 | if (walker->stop) |
338 | return; | |
6accec76 DM |
339 | list_for_each_entry(flow, &p->flows, list) { |
340 | if (walker->count >= walker->skip && | |
341 | walker->fn(sch, (unsigned long)flow, walker) < 0) { | |
342 | walker->stop = 1; | |
343 | break; | |
344 | } | |
1da177e4 LT |
345 | walker->count++; |
346 | } | |
347 | } | |
348 | ||
25d8c0d5 JF |
349 | static struct tcf_proto __rcu **atm_tc_find_tcf(struct Qdisc *sch, |
350 | unsigned long cl) | |
1da177e4 | 351 | { |
786a9036 | 352 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 353 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 354 | |
786a9036 | 355 | pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
10297b99 | 356 | return flow ? &flow->filter_list : &p->link.filter_list; |
1da177e4 LT |
357 | } |
358 | ||
1da177e4 LT |
359 | /* --------------------------- Qdisc operations ---------------------------- */ |
360 | ||
520ac30f ED |
361 | static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
362 | struct sk_buff **to_free) | |
1da177e4 | 363 | { |
786a9036 | 364 | struct atm_qdisc_data *p = qdisc_priv(sch); |
6accec76 | 365 | struct atm_flow_data *flow; |
1da177e4 LT |
366 | struct tcf_result res; |
367 | int result; | |
99860208 | 368 | int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 | 369 | |
786a9036 | 370 | pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
95df1b16 | 371 | result = TC_ACT_OK; /* be nice to gcc */ |
6accec76 | 372 | flow = NULL; |
1da177e4 | 373 | if (TC_H_MAJ(skb->priority) != sch->handle || |
6accec76 | 374 | !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) { |
25d8c0d5 JF |
375 | struct tcf_proto *fl; |
376 | ||
6accec76 | 377 | list_for_each_entry(flow, &p->flows, list) { |
25d8c0d5 JF |
378 | fl = rcu_dereference_bh(flow->filter_list); |
379 | if (fl) { | |
3b3ae880 | 380 | result = tc_classify(skb, fl, &res, true); |
b0188d4d PM |
381 | if (result < 0) |
382 | continue; | |
383 | flow = (struct atm_flow_data *)res.class; | |
384 | if (!flow) | |
385 | flow = lookup_flow(sch, res.classid); | |
6accec76 | 386 | goto done; |
1da177e4 | 387 | } |
6accec76 DM |
388 | } |
389 | flow = NULL; | |
cc7ec456 ED |
390 | done: |
391 | ; | |
6accec76 | 392 | } |
cc7ec456 | 393 | if (!flow) { |
b0188d4d | 394 | flow = &p->link; |
cc7ec456 | 395 | } else { |
1da177e4 LT |
396 | if (flow->vcc) |
397 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; | |
b0188d4d | 398 | /*@@@ looks good ... but it's not supposed to work :-) */ |
92100804 PM |
399 | #ifdef CONFIG_NET_CLS_ACT |
400 | switch (result) { | |
401 | case TC_ACT_QUEUED: | |
402 | case TC_ACT_STOLEN: | |
520ac30f | 403 | __qdisc_drop(skb, to_free); |
378a2f09 | 404 | return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
92100804 | 405 | case TC_ACT_SHOT: |
520ac30f | 406 | __qdisc_drop(skb, to_free); |
92100804 | 407 | goto drop; |
95df1b16 | 408 | case TC_ACT_RECLASSIFY: |
73ca4918 PM |
409 | if (flow->excess) |
410 | flow = flow->excess; | |
411 | else | |
412 | ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; | |
413 | break; | |
92100804 | 414 | } |
1da177e4 LT |
415 | #endif |
416 | } | |
c3bc7cff | 417 | |
520ac30f | 418 | ret = qdisc_enqueue(skb, flow->q, to_free); |
9871e50e | 419 | if (ret != NET_XMIT_SUCCESS) { |
92100804 | 420 | drop: __maybe_unused |
378a2f09 | 421 | if (net_xmit_drop_count(ret)) { |
25331d6c | 422 | qdisc_qstats_drop(sch); |
378a2f09 JP |
423 | if (flow) |
424 | flow->qstats.drops++; | |
425 | } | |
1da177e4 LT |
426 | return ret; |
427 | } | |
1da177e4 LT |
428 | /* |
429 | * Okay, this may seem weird. We pretend we've dropped the packet if | |
430 | * it goes via ATM. The reason for this is that the outer qdisc | |
431 | * expects to be able to q->dequeue the packet later on if we return | |
432 | * success at this place. Also, sch->q.qdisc needs to reflect whether | |
433 | * there is a packet egligible for dequeuing or not. Note that the | |
434 | * statistics of the outer qdisc are necessarily wrong because of all | |
435 | * this. There's currently no correct solution for this. | |
436 | */ | |
437 | if (flow == &p->link) { | |
438 | sch->q.qlen++; | |
9871e50e | 439 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
440 | } |
441 | tasklet_schedule(&p->task); | |
c27f339a | 442 | return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
443 | } |
444 | ||
1da177e4 LT |
445 | /* |
446 | * Dequeue packets and send them over ATM. Note that we quite deliberately | |
447 | * avoid checking net_device's flow control here, simply because sch_atm | |
448 | * uses its own channels, which have nothing to do with any CLIP/LANE/or | |
449 | * non-ATM interfaces. | |
450 | */ | |
451 | ||
1da177e4 LT |
452 | static void sch_atm_dequeue(unsigned long data) |
453 | { | |
b0188d4d | 454 | struct Qdisc *sch = (struct Qdisc *)data; |
786a9036 | 455 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
456 | struct atm_flow_data *flow; |
457 | struct sk_buff *skb; | |
458 | ||
786a9036 | 459 | pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
6accec76 DM |
460 | list_for_each_entry(flow, &p->flows, list) { |
461 | if (flow == &p->link) | |
462 | continue; | |
1da177e4 LT |
463 | /* |
464 | * If traffic is properly shaped, this won't generate nasty | |
465 | * little bursts. Otherwise, it may ... (but that's okay) | |
466 | */ | |
03c05f0d JP |
467 | while ((skb = flow->q->ops->peek(flow->q))) { |
468 | if (!atm_may_send(flow->vcc, skb->truesize)) | |
1da177e4 | 469 | break; |
03c05f0d | 470 | |
77be155c | 471 | skb = qdisc_dequeue_peeked(flow->q); |
03c05f0d JP |
472 | if (unlikely(!skb)) |
473 | break; | |
474 | ||
2dd875ff ED |
475 | qdisc_bstats_update(sch, skb); |
476 | bstats_update(&flow->bstats, skb); | |
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 | 498 | } |
6accec76 | 499 | } |
1da177e4 LT |
500 | } |
501 | ||
1da177e4 LT |
502 | static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
503 | { | |
786a9036 | 504 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
505 | struct sk_buff *skb; |
506 | ||
786a9036 | 507 | pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 | 508 | tasklet_schedule(&p->task); |
77be155c | 509 | skb = qdisc_dequeue_peeked(p->link.q); |
b0188d4d PM |
510 | if (skb) |
511 | sch->q.qlen--; | |
1da177e4 LT |
512 | return skb; |
513 | } | |
514 | ||
8e3af978 JP |
515 | static struct sk_buff *atm_tc_peek(struct Qdisc *sch) |
516 | { | |
517 | struct atm_qdisc_data *p = qdisc_priv(sch); | |
518 | ||
519 | pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p); | |
520 | ||
521 | return p->link.q->ops->peek(p->link.q); | |
522 | } | |
523 | ||
1e90474c | 524 | static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 525 | { |
786a9036 | 526 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 | 527 | |
786a9036 | 528 | pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
6accec76 DM |
529 | INIT_LIST_HEAD(&p->flows); |
530 | INIT_LIST_HEAD(&p->link.list); | |
531 | list_add(&p->link.list, &p->flows); | |
3511c913 | 532 | p->link.q = qdisc_create_dflt(sch->dev_queue, |
bb949fbd | 533 | &pfifo_qdisc_ops, sch->handle); |
786a9036 | 534 | if (!p->link.q) |
1da177e4 | 535 | p->link.q = &noop_qdisc; |
786a9036 | 536 | pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
25d8c0d5 | 537 | RCU_INIT_POINTER(p->link.filter_list, NULL); |
1da177e4 LT |
538 | p->link.vcc = NULL; |
539 | p->link.sock = NULL; | |
540 | p->link.classid = sch->handle; | |
541 | p->link.ref = 1; | |
b0188d4d | 542 | tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); |
1da177e4 LT |
543 | return 0; |
544 | } | |
545 | ||
1da177e4 LT |
546 | static void atm_tc_reset(struct Qdisc *sch) |
547 | { | |
786a9036 | 548 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
549 | struct atm_flow_data *flow; |
550 | ||
786a9036 | 551 | pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
6accec76 | 552 | list_for_each_entry(flow, &p->flows, list) |
b0188d4d | 553 | qdisc_reset(flow->q); |
1da177e4 LT |
554 | sch->q.qlen = 0; |
555 | } | |
556 | ||
1da177e4 LT |
557 | static void atm_tc_destroy(struct Qdisc *sch) |
558 | { | |
786a9036 | 559 | struct atm_qdisc_data *p = qdisc_priv(sch); |
6accec76 | 560 | struct atm_flow_data *flow, *tmp; |
1da177e4 | 561 | |
786a9036 | 562 | pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
6accec76 | 563 | list_for_each_entry(flow, &p->flows, list) |
a4aebb83 PM |
564 | tcf_destroy_chain(&flow->filter_list); |
565 | ||
6accec76 | 566 | list_for_each_entry_safe(flow, tmp, &p->flows, list) { |
1da177e4 | 567 | if (flow->ref > 1) |
cc7ec456 | 568 | pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref); |
b0188d4d | 569 | atm_tc_put(sch, (unsigned long)flow); |
1da177e4 LT |
570 | } |
571 | tasklet_kill(&p->task); | |
572 | } | |
573 | ||
1da177e4 | 574 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
b0188d4d | 575 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 | 576 | { |
786a9036 | 577 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 578 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
4b3550ef | 579 | struct nlattr *nest; |
1da177e4 | 580 | |
786a9036 | 581 | pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
b0188d4d | 582 | sch, p, flow, skb, tcm); |
6accec76 | 583 | if (list_empty(&flow->list)) |
b0188d4d | 584 | return -EINVAL; |
1da177e4 | 585 | tcm->tcm_handle = flow->classid; |
cdc7f8e3 | 586 | tcm->tcm_info = flow->q->handle; |
4b3550ef PM |
587 | |
588 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
589 | if (nest == NULL) | |
590 | goto nla_put_failure; | |
591 | ||
1b34ec43 DM |
592 | if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr)) |
593 | goto nla_put_failure; | |
1da177e4 LT |
594 | if (flow->vcc) { |
595 | struct sockaddr_atmpvc pvc; | |
596 | int state; | |
597 | ||
8cb3b9c3 | 598 | memset(&pvc, 0, sizeof(pvc)); |
1da177e4 LT |
599 | pvc.sap_family = AF_ATMPVC; |
600 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; | |
601 | pvc.sap_addr.vpi = flow->vcc->vpi; | |
602 | pvc.sap_addr.vci = flow->vcc->vci; | |
1b34ec43 DM |
603 | if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc)) |
604 | goto nla_put_failure; | |
1da177e4 | 605 | state = ATM_VF2VS(flow->vcc->flags); |
1b34ec43 DM |
606 | if (nla_put_u32(skb, TCA_ATM_STATE, state)) |
607 | goto nla_put_failure; | |
608 | } | |
609 | if (flow->excess) { | |
610 | if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->classid)) | |
611 | goto nla_put_failure; | |
612 | } else { | |
613 | if (nla_put_u32(skb, TCA_ATM_EXCESS, 0)) | |
614 | goto nla_put_failure; | |
1da177e4 | 615 | } |
d59b7d80 | 616 | return nla_nest_end(skb, nest); |
1da177e4 | 617 | |
1e90474c | 618 | nla_put_failure: |
4b3550ef | 619 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
620 | return -1; |
621 | } | |
622 | static int | |
623 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
b0188d4d | 624 | struct gnet_dump *d) |
1da177e4 | 625 | { |
b0188d4d | 626 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 627 | |
edb09eb1 ED |
628 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
629 | d, NULL, &flow->bstats) < 0 || | |
b0ab6f92 | 630 | gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0) |
1da177e4 LT |
631 | return -1; |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) | |
637 | { | |
638 | return 0; | |
639 | } | |
640 | ||
20fea08b | 641 | static const struct Qdisc_class_ops atm_class_ops = { |
b0188d4d PM |
642 | .graft = atm_tc_graft, |
643 | .leaf = atm_tc_leaf, | |
644 | .get = atm_tc_get, | |
645 | .put = atm_tc_put, | |
646 | .change = atm_tc_change, | |
647 | .delete = atm_tc_delete, | |
648 | .walk = atm_tc_walk, | |
649 | .tcf_chain = atm_tc_find_tcf, | |
650 | .bind_tcf = atm_tc_bind_filter, | |
651 | .unbind_tcf = atm_tc_put, | |
652 | .dump = atm_tc_dump_class, | |
653 | .dump_stats = atm_tc_dump_class_stats, | |
1da177e4 LT |
654 | }; |
655 | ||
20fea08b | 656 | static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
b0188d4d PM |
657 | .cl_ops = &atm_class_ops, |
658 | .id = "atm", | |
659 | .priv_size = sizeof(struct atm_qdisc_data), | |
660 | .enqueue = atm_tc_enqueue, | |
661 | .dequeue = atm_tc_dequeue, | |
8e3af978 | 662 | .peek = atm_tc_peek, |
b0188d4d PM |
663 | .init = atm_tc_init, |
664 | .reset = atm_tc_reset, | |
665 | .destroy = atm_tc_destroy, | |
666 | .dump = atm_tc_dump, | |
667 | .owner = THIS_MODULE, | |
1da177e4 LT |
668 | }; |
669 | ||
1da177e4 LT |
670 | static int __init atm_init(void) |
671 | { | |
672 | return register_qdisc(&atm_qdisc_ops); | |
673 | } | |
674 | ||
10297b99 | 675 | static void __exit atm_exit(void) |
1da177e4 LT |
676 | { |
677 | unregister_qdisc(&atm_qdisc_ops); | |
678 | } | |
679 | ||
680 | module_init(atm_init) | |
681 | module_exit(atm_exit) | |
682 | MODULE_LICENSE("GPL"); |