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Commit | Line | Data |
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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 | ||
1da177e4 LT |
22 | #define PRIV(sch) qdisc_priv(sch) |
23 | ||
58f4df42 | 24 | /* Thanks to Doron Oz for this hack */ |
1da177e4 LT |
25 | #ifndef CONFIG_NET_CLS_ACT |
26 | #ifdef CONFIG_NETFILTER | |
10297b99 | 27 | static int nf_registered; |
1da177e4 LT |
28 | #endif |
29 | #endif | |
30 | ||
31 | struct ingress_qdisc_data { | |
32 | struct Qdisc *q; | |
33 | struct tcf_proto *filter_list; | |
34 | }; | |
35 | ||
1da177e4 LT |
36 | /* ------------------------- Class/flow operations ------------------------- */ |
37 | ||
58f4df42 PM |
38 | static int ingress_graft(struct Qdisc *sch, unsigned long arg, |
39 | struct Qdisc *new, struct Qdisc **old) | |
1da177e4 | 40 | { |
10297b99 | 41 | return 1; |
1da177e4 LT |
42 | } |
43 | ||
1da177e4 LT |
44 | static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) |
45 | { | |
46 | return NULL; | |
47 | } | |
48 | ||
58f4df42 | 49 | static unsigned long ingress_get(struct Qdisc *sch, u32 classid) |
1da177e4 | 50 | { |
1da177e4 LT |
51 | return TC_H_MIN(classid) + 1; |
52 | } | |
53 | ||
1da177e4 | 54 | static unsigned long ingress_bind_filter(struct Qdisc *sch, |
58f4df42 | 55 | unsigned long parent, u32 classid) |
1da177e4 LT |
56 | { |
57 | return ingress_get(sch, classid); | |
58 | } | |
59 | ||
1da177e4 LT |
60 | static void ingress_put(struct Qdisc *sch, unsigned long cl) |
61 | { | |
62 | } | |
63 | ||
1da177e4 | 64 | static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent, |
58f4df42 | 65 | struct rtattr **tca, unsigned long *arg) |
1da177e4 | 66 | { |
1da177e4 LT |
67 | return 0; |
68 | } | |
69 | ||
58f4df42 | 70 | static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 | 71 | { |
a4781221 | 72 | return; |
1da177e4 LT |
73 | } |
74 | ||
58f4df42 | 75 | static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl) |
1da177e4 LT |
76 | { |
77 | struct ingress_qdisc_data *p = PRIV(sch); | |
78 | ||
79 | return &p->filter_list; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | /* --------------------------- Qdisc operations ---------------------------- */ |
83 | ||
58f4df42 | 84 | static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 LT |
85 | { |
86 | struct ingress_qdisc_data *p = PRIV(sch); | |
87 | struct tcf_result res; | |
88 | int result; | |
89 | ||
1da177e4 | 90 | result = tc_classify(skb, p->filter_list, &res); |
a4781221 | 91 | |
1da177e4 LT |
92 | /* |
93 | * Unlike normal "enqueue" functions, ingress_enqueue returns a | |
94 | * firewall FW_* code. | |
95 | */ | |
96 | #ifdef CONFIG_NET_CLS_ACT | |
97 | sch->bstats.packets++; | |
98 | sch->bstats.bytes += skb->len; | |
99 | switch (result) { | |
58f4df42 PM |
100 | case TC_ACT_SHOT: |
101 | result = TC_ACT_SHOT; | |
102 | sch->qstats.drops++; | |
103 | break; | |
104 | case TC_ACT_STOLEN: | |
105 | case TC_ACT_QUEUED: | |
106 | result = TC_ACT_STOLEN; | |
107 | break; | |
108 | case TC_ACT_RECLASSIFY: | |
109 | case TC_ACT_OK: | |
110 | skb->tc_index = TC_H_MIN(res.classid); | |
111 | default: | |
112 | result = TC_ACT_OK; | |
113 | break; | |
3ff50b79 | 114 | } |
1da177e4 | 115 | #else |
1da177e4 LT |
116 | result = NF_ACCEPT; |
117 | sch->bstats.packets++; | |
118 | sch->bstats.bytes += skb->len; | |
1da177e4 LT |
119 | #endif |
120 | ||
121 | return result; | |
122 | } | |
123 | ||
1da177e4 LT |
124 | static struct sk_buff *ingress_dequeue(struct Qdisc *sch) |
125 | { | |
1da177e4 LT |
126 | return NULL; |
127 | } | |
128 | ||
58f4df42 | 129 | static int ingress_requeue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 130 | { |
1da177e4 LT |
131 | return 0; |
132 | } | |
133 | ||
134 | static unsigned int ingress_drop(struct Qdisc *sch) | |
135 | { | |
1da177e4 LT |
136 | return 0; |
137 | } | |
138 | ||
139 | #ifndef CONFIG_NET_CLS_ACT | |
140 | #ifdef CONFIG_NETFILTER | |
58f4df42 | 141 | static unsigned int ing_hook(unsigned int hook, struct sk_buff *skb, |
10297b99 YH |
142 | const struct net_device *indev, |
143 | const struct net_device *outdev, | |
144 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 145 | { |
10297b99 | 146 | |
1da177e4 | 147 | struct Qdisc *q; |
10297b99 | 148 | struct net_device *dev = skb->dev; |
58f4df42 | 149 | int fwres = NF_ACCEPT; |
1da177e4 | 150 | |
1da177e4 | 151 | if (dev->qdisc_ingress) { |
fd44de7c | 152 | spin_lock(&dev->ingress_lock); |
1da177e4 LT |
153 | if ((q = dev->qdisc_ingress) != NULL) |
154 | fwres = q->enqueue(skb, q); | |
fd44de7c | 155 | spin_unlock(&dev->ingress_lock); |
10297b99 YH |
156 | } |
157 | ||
1da177e4 LT |
158 | return fwres; |
159 | } | |
160 | ||
161 | /* after ipt_filter */ | |
1999414a | 162 | static struct nf_hook_ops ing_ops[] __read_mostly = { |
41c5b317 PM |
163 | { |
164 | .hook = ing_hook, | |
165 | .owner = THIS_MODULE, | |
166 | .pf = PF_INET, | |
167 | .hooknum = NF_INET_PRE_ROUTING, | |
168 | .priority = NF_IP_PRI_FILTER + 1, | |
169 | }, | |
170 | { | |
171 | .hook = ing_hook, | |
172 | .owner = THIS_MODULE, | |
173 | .pf = PF_INET6, | |
174 | .hooknum = NF_INET_PRE_ROUTING, | |
175 | .priority = NF_IP6_PRI_FILTER + 1, | |
176 | }, | |
1da177e4 | 177 | }; |
1da177e4 LT |
178 | #endif |
179 | #endif | |
180 | ||
58f4df42 | 181 | static int ingress_init(struct Qdisc *sch, struct rtattr *opt) |
1da177e4 LT |
182 | { |
183 | struct ingress_qdisc_data *p = PRIV(sch); | |
184 | ||
58f4df42 PM |
185 | /* Make sure either netfilter or preferably CLS_ACT is |
186 | * compiled in */ | |
1da177e4 LT |
187 | #ifndef CONFIG_NET_CLS_ACT |
188 | #ifndef CONFIG_NETFILTER | |
189 | printk("You MUST compile classifier actions into the kernel\n"); | |
190 | return -EINVAL; | |
191 | #else | |
192 | printk("Ingress scheduler: Classifier actions prefered over netfilter\n"); | |
193 | #endif | |
194 | #endif | |
10297b99 | 195 | |
1da177e4 LT |
196 | #ifndef CONFIG_NET_CLS_ACT |
197 | #ifdef CONFIG_NETFILTER | |
198 | if (!nf_registered) { | |
41c5b317 | 199 | if (nf_register_hooks(ing_ops, ARRAY_SIZE(ing_ops)) < 0) { |
1da177e4 LT |
200 | printk("ingress qdisc registration error \n"); |
201 | return -EINVAL; | |
202 | } | |
203 | nf_registered++; | |
1da177e4 LT |
204 | } |
205 | #endif | |
206 | #endif | |
1da177e4 LT |
207 | p->q = &noop_qdisc; |
208 | return 0; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | static void ingress_reset(struct Qdisc *sch) |
212 | { | |
a4781221 | 213 | return; |
1da177e4 LT |
214 | } |
215 | ||
1da177e4 LT |
216 | /* ------------------------------------------------------------- */ |
217 | ||
218 | static void ingress_destroy(struct Qdisc *sch) | |
219 | { | |
220 | struct ingress_qdisc_data *p = PRIV(sch); | |
1da177e4 | 221 | |
a48b5a61 | 222 | tcf_destroy_chain(p->filter_list); |
1da177e4 LT |
223 | } |
224 | ||
1da177e4 LT |
225 | static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) |
226 | { | |
27a884dc | 227 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
228 | struct rtattr *rta; |
229 | ||
58f4df42 | 230 | rta = (struct rtattr *)b; |
1da177e4 | 231 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
27a884dc | 232 | rta->rta_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
233 | return skb->len; |
234 | ||
235 | rtattr_failure: | |
dc5fc579 | 236 | nlmsg_trim(skb, b); |
1da177e4 LT |
237 | return -1; |
238 | } | |
239 | ||
20fea08b | 240 | static const struct Qdisc_class_ops ingress_class_ops = { |
1da177e4 LT |
241 | .graft = ingress_graft, |
242 | .leaf = ingress_leaf, | |
243 | .get = ingress_get, | |
244 | .put = ingress_put, | |
245 | .change = ingress_change, | |
1da177e4 LT |
246 | .walk = ingress_walk, |
247 | .tcf_chain = ingress_find_tcf, | |
248 | .bind_tcf = ingress_bind_filter, | |
249 | .unbind_tcf = ingress_put, | |
1da177e4 LT |
250 | }; |
251 | ||
20fea08b | 252 | static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { |
1da177e4 LT |
253 | .cl_ops = &ingress_class_ops, |
254 | .id = "ingress", | |
255 | .priv_size = sizeof(struct ingress_qdisc_data), | |
256 | .enqueue = ingress_enqueue, | |
257 | .dequeue = ingress_dequeue, | |
258 | .requeue = ingress_requeue, | |
259 | .drop = ingress_drop, | |
260 | .init = ingress_init, | |
261 | .reset = ingress_reset, | |
262 | .destroy = ingress_destroy, | |
1da177e4 LT |
263 | .dump = ingress_dump, |
264 | .owner = THIS_MODULE, | |
265 | }; | |
266 | ||
267 | static int __init ingress_module_init(void) | |
268 | { | |
269 | int ret = 0; | |
270 | ||
271 | if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) { | |
272 | printk("Unable to register Ingress qdisc\n"); | |
273 | return ret; | |
274 | } | |
275 | ||
276 | return ret; | |
277 | } | |
58f4df42 | 278 | |
10297b99 | 279 | static void __exit ingress_module_exit(void) |
1da177e4 LT |
280 | { |
281 | unregister_qdisc(&ingress_qdisc_ops); | |
282 | #ifndef CONFIG_NET_CLS_ACT | |
283 | #ifdef CONFIG_NETFILTER | |
41c5b317 PM |
284 | if (nf_registered) |
285 | nf_unregister_hooks(ing_ops, ARRAY_SIZE(ing_ops)); | |
1da177e4 LT |
286 | #endif |
287 | #endif | |
288 | } | |
58f4df42 | 289 | |
1da177e4 LT |
290 | module_init(ingress_module_init) |
291 | module_exit(ingress_module_exit) | |
292 | MODULE_LICENSE("GPL"); |