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10297b99 | 1 | /* net/sched/sch_ingress.c - Ingress qdisc |
1da177e4 LT |
2 | * This program is free software; you can redistribute it and/or |
3 | * modify it under the terms of the GNU General Public License | |
4 | * as published by the Free Software Foundation; either version | |
5 | * 2 of the License, or (at your option) any later version. | |
6 | * | |
7 | * Authors: Jamal Hadi Salim 1999 | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/types.h> | |
0ba48053 | 12 | #include <linux/list.h> |
1da177e4 | 13 | #include <linux/skbuff.h> |
1da177e4 LT |
14 | #include <linux/rtnetlink.h> |
15 | #include <linux/netfilter_ipv4.h> | |
16 | #include <linux/netfilter_ipv6.h> | |
17 | #include <linux/netfilter.h> | |
dc5fc579 | 18 | #include <net/netlink.h> |
1da177e4 | 19 | #include <net/pkt_sched.h> |
1da177e4 LT |
20 | |
21 | ||
22 | #undef DEBUG_INGRESS | |
23 | ||
24 | #ifdef DEBUG_INGRESS /* control */ | |
25 | #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) | |
26 | #else | |
27 | #define DPRINTK(format,args...) | |
28 | #endif | |
29 | ||
30 | #if 0 /* data */ | |
31 | #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args) | |
32 | #else | |
33 | #define D2PRINTK(format,args...) | |
34 | #endif | |
35 | ||
36 | ||
37 | #define PRIV(sch) qdisc_priv(sch) | |
38 | ||
39 | ||
40 | /* Thanks to Doron Oz for this hack | |
41 | */ | |
42 | #ifndef CONFIG_NET_CLS_ACT | |
43 | #ifdef CONFIG_NETFILTER | |
10297b99 | 44 | static int nf_registered; |
1da177e4 LT |
45 | #endif |
46 | #endif | |
47 | ||
48 | struct ingress_qdisc_data { | |
49 | struct Qdisc *q; | |
50 | struct tcf_proto *filter_list; | |
51 | }; | |
52 | ||
53 | ||
54 | /* ------------------------- Class/flow operations ------------------------- */ | |
55 | ||
56 | ||
57 | static int ingress_graft(struct Qdisc *sch,unsigned long arg, | |
58 | struct Qdisc *new,struct Qdisc **old) | |
59 | { | |
60 | #ifdef DEBUG_INGRESS | |
61 | struct ingress_qdisc_data *p = PRIV(sch); | |
62 | #endif | |
63 | ||
64 | DPRINTK("ingress_graft(sch %p,[qdisc %p],new %p,old %p)\n", | |
65 | sch, p, new, old); | |
66 | DPRINTK("\n ingress_graft: You cannot add qdiscs to classes"); | |
10297b99 | 67 | return 1; |
1da177e4 LT |
68 | } |
69 | ||
70 | ||
71 | static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) | |
72 | { | |
73 | return NULL; | |
74 | } | |
75 | ||
76 | ||
77 | static unsigned long ingress_get(struct Qdisc *sch,u32 classid) | |
78 | { | |
79 | #ifdef DEBUG_INGRESS | |
80 | struct ingress_qdisc_data *p = PRIV(sch); | |
81 | #endif | |
82 | DPRINTK("ingress_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); | |
83 | return TC_H_MIN(classid) + 1; | |
84 | } | |
85 | ||
86 | ||
87 | static unsigned long ingress_bind_filter(struct Qdisc *sch, | |
88 | unsigned long parent, u32 classid) | |
89 | { | |
90 | return ingress_get(sch, classid); | |
91 | } | |
92 | ||
93 | ||
94 | static void ingress_put(struct Qdisc *sch, unsigned long cl) | |
95 | { | |
96 | } | |
97 | ||
98 | ||
99 | static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent, | |
100 | struct rtattr **tca, unsigned long *arg) | |
101 | { | |
102 | #ifdef DEBUG_INGRESS | |
103 | struct ingress_qdisc_data *p = PRIV(sch); | |
104 | #endif | |
105 | DPRINTK("ingress_change(sch %p,[qdisc %p],classid %x,parent %x)," | |
106 | "arg 0x%lx\n", sch, p, classid, parent, *arg); | |
107 | DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment"); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | ||
112 | ||
113 | static void ingress_walk(struct Qdisc *sch,struct qdisc_walker *walker) | |
114 | { | |
115 | #ifdef DEBUG_INGRESS | |
116 | struct ingress_qdisc_data *p = PRIV(sch); | |
117 | #endif | |
118 | DPRINTK("ingress_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); | |
119 | DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment"); | |
120 | } | |
121 | ||
122 | ||
123 | static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch,unsigned long cl) | |
124 | { | |
125 | struct ingress_qdisc_data *p = PRIV(sch); | |
126 | ||
127 | return &p->filter_list; | |
128 | } | |
129 | ||
130 | ||
131 | /* --------------------------- Qdisc operations ---------------------------- */ | |
132 | ||
133 | ||
134 | static int ingress_enqueue(struct sk_buff *skb,struct Qdisc *sch) | |
135 | { | |
136 | struct ingress_qdisc_data *p = PRIV(sch); | |
137 | struct tcf_result res; | |
138 | int result; | |
139 | ||
140 | D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); | |
141 | result = tc_classify(skb, p->filter_list, &res); | |
142 | D2PRINTK("result %d class 0x%04x\n", result, res.classid); | |
143 | /* | |
144 | * Unlike normal "enqueue" functions, ingress_enqueue returns a | |
145 | * firewall FW_* code. | |
146 | */ | |
147 | #ifdef CONFIG_NET_CLS_ACT | |
148 | sch->bstats.packets++; | |
149 | sch->bstats.bytes += skb->len; | |
150 | switch (result) { | |
151 | case TC_ACT_SHOT: | |
152 | result = TC_ACT_SHOT; | |
153 | sch->qstats.drops++; | |
154 | break; | |
155 | case TC_ACT_STOLEN: | |
156 | case TC_ACT_QUEUED: | |
157 | result = TC_ACT_STOLEN; | |
158 | break; | |
10297b99 | 159 | case TC_ACT_RECLASSIFY: |
1da177e4 LT |
160 | case TC_ACT_OK: |
161 | case TC_ACT_UNSPEC: | |
162 | default: | |
163 | skb->tc_index = TC_H_MIN(res.classid); | |
164 | result = TC_ACT_OK; | |
165 | break; | |
3ff50b79 | 166 | } |
1da177e4 LT |
167 | /* backward compat */ |
168 | #else | |
10297b99 | 169 | #ifdef CONFIG_NET_CLS_POLICE |
1da177e4 LT |
170 | switch (result) { |
171 | case TC_POLICE_SHOT: | |
172 | result = NF_DROP; | |
173 | sch->qstats.drops++; | |
174 | break; | |
175 | case TC_POLICE_RECLASSIFY: /* DSCP remarking here ? */ | |
176 | case TC_POLICE_OK: | |
177 | case TC_POLICE_UNSPEC: | |
178 | default: | |
179 | sch->bstats.packets++; | |
180 | sch->bstats.bytes += skb->len; | |
181 | result = NF_ACCEPT; | |
182 | break; | |
3ff50b79 | 183 | } |
1da177e4 LT |
184 | |
185 | #else | |
186 | D2PRINTK("Overriding result to ACCEPT\n"); | |
187 | result = NF_ACCEPT; | |
188 | sch->bstats.packets++; | |
189 | sch->bstats.bytes += skb->len; | |
190 | #endif | |
191 | #endif | |
192 | ||
193 | return result; | |
194 | } | |
195 | ||
196 | ||
197 | static struct sk_buff *ingress_dequeue(struct Qdisc *sch) | |
198 | { | |
199 | /* | |
200 | struct ingress_qdisc_data *p = PRIV(sch); | |
201 | D2PRINTK("ingress_dequeue(sch %p,[qdisc %p])\n",sch,PRIV(p)); | |
202 | */ | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | ||
207 | static int ingress_requeue(struct sk_buff *skb,struct Qdisc *sch) | |
208 | { | |
209 | /* | |
210 | struct ingress_qdisc_data *p = PRIV(sch); | |
211 | D2PRINTK("ingress_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,PRIV(p)); | |
212 | */ | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static unsigned int ingress_drop(struct Qdisc *sch) | |
217 | { | |
218 | #ifdef DEBUG_INGRESS | |
219 | struct ingress_qdisc_data *p = PRIV(sch); | |
220 | #endif | |
221 | DPRINTK("ingress_drop(sch %p,[qdisc %p])\n", sch, p); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | #ifndef CONFIG_NET_CLS_ACT | |
226 | #ifdef CONFIG_NETFILTER | |
227 | static unsigned int | |
228 | ing_hook(unsigned int hook, struct sk_buff **pskb, | |
10297b99 YH |
229 | const struct net_device *indev, |
230 | const struct net_device *outdev, | |
231 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 232 | { |
10297b99 | 233 | |
1da177e4 LT |
234 | struct Qdisc *q; |
235 | struct sk_buff *skb = *pskb; | |
10297b99 | 236 | struct net_device *dev = skb->dev; |
1da177e4 LT |
237 | int fwres=NF_ACCEPT; |
238 | ||
239 | DPRINTK("ing_hook: skb %s dev=%s len=%u\n", | |
240 | skb->sk ? "(owned)" : "(unowned)", | |
241 | skb->dev ? (*pskb)->dev->name : "(no dev)", | |
242 | skb->len); | |
243 | ||
1da177e4 | 244 | if (dev->qdisc_ingress) { |
fd44de7c | 245 | spin_lock(&dev->ingress_lock); |
1da177e4 LT |
246 | if ((q = dev->qdisc_ingress) != NULL) |
247 | fwres = q->enqueue(skb, q); | |
fd44de7c | 248 | spin_unlock(&dev->ingress_lock); |
10297b99 YH |
249 | } |
250 | ||
1da177e4 LT |
251 | return fwres; |
252 | } | |
253 | ||
254 | /* after ipt_filter */ | |
255 | static struct nf_hook_ops ing_ops = { | |
256 | .hook = ing_hook, | |
257 | .owner = THIS_MODULE, | |
258 | .pf = PF_INET, | |
259 | .hooknum = NF_IP_PRE_ROUTING, | |
260 | .priority = NF_IP_PRI_FILTER + 1, | |
261 | }; | |
262 | ||
263 | static struct nf_hook_ops ing6_ops = { | |
264 | .hook = ing_hook, | |
265 | .owner = THIS_MODULE, | |
266 | .pf = PF_INET6, | |
267 | .hooknum = NF_IP6_PRE_ROUTING, | |
268 | .priority = NF_IP6_PRI_FILTER + 1, | |
269 | }; | |
270 | ||
271 | #endif | |
272 | #endif | |
273 | ||
274 | static int ingress_init(struct Qdisc *sch,struct rtattr *opt) | |
275 | { | |
276 | struct ingress_qdisc_data *p = PRIV(sch); | |
277 | ||
278 | /* Make sure either netfilter or preferably CLS_ACT is | |
279 | * compiled in */ | |
280 | #ifndef CONFIG_NET_CLS_ACT | |
281 | #ifndef CONFIG_NETFILTER | |
282 | printk("You MUST compile classifier actions into the kernel\n"); | |
283 | return -EINVAL; | |
284 | #else | |
285 | printk("Ingress scheduler: Classifier actions prefered over netfilter\n"); | |
286 | #endif | |
287 | #endif | |
10297b99 | 288 | |
1da177e4 LT |
289 | #ifndef CONFIG_NET_CLS_ACT |
290 | #ifdef CONFIG_NETFILTER | |
291 | if (!nf_registered) { | |
292 | if (nf_register_hook(&ing_ops) < 0) { | |
293 | printk("ingress qdisc registration error \n"); | |
294 | return -EINVAL; | |
295 | } | |
296 | nf_registered++; | |
297 | ||
298 | if (nf_register_hook(&ing6_ops) < 0) { | |
299 | printk("IPv6 ingress qdisc registration error, " \ | |
300 | "disabling IPv6 support.\n"); | |
301 | } else | |
302 | nf_registered++; | |
303 | } | |
304 | #endif | |
305 | #endif | |
306 | ||
307 | DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt); | |
308 | p->q = &noop_qdisc; | |
309 | return 0; | |
310 | } | |
311 | ||
312 | ||
313 | static void ingress_reset(struct Qdisc *sch) | |
314 | { | |
315 | struct ingress_qdisc_data *p = PRIV(sch); | |
316 | ||
317 | DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p); | |
318 | ||
319 | /* | |
320 | #if 0 | |
321 | */ | |
322 | /* for future use */ | |
323 | qdisc_reset(p->q); | |
324 | /* | |
325 | #endif | |
326 | */ | |
327 | } | |
328 | ||
329 | /* ------------------------------------------------------------- */ | |
330 | ||
331 | ||
332 | /* ------------------------------------------------------------- */ | |
333 | ||
334 | static void ingress_destroy(struct Qdisc *sch) | |
335 | { | |
336 | struct ingress_qdisc_data *p = PRIV(sch); | |
1da177e4 LT |
337 | |
338 | DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p); | |
a48b5a61 | 339 | tcf_destroy_chain(p->filter_list); |
1da177e4 LT |
340 | #if 0 |
341 | /* for future use */ | |
342 | qdisc_destroy(p->q); | |
343 | #endif | |
344 | } | |
345 | ||
346 | ||
347 | static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) | |
348 | { | |
27a884dc | 349 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
350 | struct rtattr *rta; |
351 | ||
352 | rta = (struct rtattr *) b; | |
353 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
27a884dc | 354 | rta->rta_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
355 | return skb->len; |
356 | ||
357 | rtattr_failure: | |
dc5fc579 | 358 | nlmsg_trim(skb, b); |
1da177e4 LT |
359 | return -1; |
360 | } | |
361 | ||
362 | static struct Qdisc_class_ops ingress_class_ops = { | |
363 | .graft = ingress_graft, | |
364 | .leaf = ingress_leaf, | |
365 | .get = ingress_get, | |
366 | .put = ingress_put, | |
367 | .change = ingress_change, | |
368 | .delete = NULL, | |
369 | .walk = ingress_walk, | |
370 | .tcf_chain = ingress_find_tcf, | |
371 | .bind_tcf = ingress_bind_filter, | |
372 | .unbind_tcf = ingress_put, | |
373 | .dump = NULL, | |
374 | }; | |
375 | ||
376 | static struct Qdisc_ops ingress_qdisc_ops = { | |
377 | .next = NULL, | |
378 | .cl_ops = &ingress_class_ops, | |
379 | .id = "ingress", | |
380 | .priv_size = sizeof(struct ingress_qdisc_data), | |
381 | .enqueue = ingress_enqueue, | |
382 | .dequeue = ingress_dequeue, | |
383 | .requeue = ingress_requeue, | |
384 | .drop = ingress_drop, | |
385 | .init = ingress_init, | |
386 | .reset = ingress_reset, | |
387 | .destroy = ingress_destroy, | |
388 | .change = NULL, | |
389 | .dump = ingress_dump, | |
390 | .owner = THIS_MODULE, | |
391 | }; | |
392 | ||
393 | static int __init ingress_module_init(void) | |
394 | { | |
395 | int ret = 0; | |
396 | ||
397 | if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) { | |
398 | printk("Unable to register Ingress qdisc\n"); | |
399 | return ret; | |
400 | } | |
401 | ||
402 | return ret; | |
403 | } | |
10297b99 | 404 | static void __exit ingress_module_exit(void) |
1da177e4 LT |
405 | { |
406 | unregister_qdisc(&ingress_qdisc_ops); | |
407 | #ifndef CONFIG_NET_CLS_ACT | |
408 | #ifdef CONFIG_NETFILTER | |
409 | if (nf_registered) { | |
410 | nf_unregister_hook(&ing_ops); | |
411 | if (nf_registered > 1) | |
412 | nf_unregister_hook(&ing6_ops); | |
413 | } | |
414 | #endif | |
415 | #endif | |
416 | } | |
417 | module_init(ingress_module_init) | |
418 | module_exit(ingress_module_exit) | |
419 | MODULE_LICENSE("GPL"); |