diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sched/ipt.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/sched/ipt.c')
-rw-r--r-- | net/sched/ipt.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/net/sched/ipt.c b/net/sched/ipt.c new file mode 100644 index 000000000000..b114d994d523 --- /dev/null +++ b/net/sched/ipt.c | |||
@@ -0,0 +1,326 @@ | |||
1 | /* | ||
2 | * net/sched/ipt.c iptables target interface | ||
3 | * | ||
4 | *TODO: Add other tables. For now we only support the ipv4 table targets | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or | ||
7 | * modify it under the terms of the GNU General Public License | ||
8 | * as published by the Free Software Foundation; either version | ||
9 | * 2 of the License, or (at your option) any later version. | ||
10 | * | ||
11 | * Copyright: Jamal Hadi Salim (2002-4) | ||
12 | */ | ||
13 | |||
14 | #include <asm/uaccess.h> | ||
15 | #include <asm/system.h> | ||
16 | #include <asm/bitops.h> | ||
17 | #include <linux/config.h> | ||
18 | #include <linux/types.h> | ||
19 | #include <linux/kernel.h> | ||
20 | #include <linux/sched.h> | ||
21 | #include <linux/string.h> | ||
22 | #include <linux/mm.h> | ||
23 | #include <linux/socket.h> | ||
24 | #include <linux/sockios.h> | ||
25 | #include <linux/in.h> | ||
26 | #include <linux/errno.h> | ||
27 | #include <linux/interrupt.h> | ||
28 | #include <linux/netdevice.h> | ||
29 | #include <linux/skbuff.h> | ||
30 | #include <linux/rtnetlink.h> | ||
31 | #include <linux/module.h> | ||
32 | #include <linux/init.h> | ||
33 | #include <linux/proc_fs.h> | ||
34 | #include <linux/kmod.h> | ||
35 | #include <net/sock.h> | ||
36 | #include <net/pkt_sched.h> | ||
37 | #include <linux/tc_act/tc_ipt.h> | ||
38 | #include <net/tc_act/tc_ipt.h> | ||
39 | |||
40 | #include <linux/netfilter_ipv4/ip_tables.h> | ||
41 | |||
42 | /* use generic hash table */ | ||
43 | #define MY_TAB_SIZE 16 | ||
44 | #define MY_TAB_MASK 15 | ||
45 | |||
46 | static u32 idx_gen; | ||
47 | static struct tcf_ipt *tcf_ipt_ht[MY_TAB_SIZE]; | ||
48 | /* ipt hash table lock */ | ||
49 | static DEFINE_RWLOCK(ipt_lock); | ||
50 | |||
51 | /* ovewrride the defaults */ | ||
52 | #define tcf_st tcf_ipt | ||
53 | #define tcf_t_lock ipt_lock | ||
54 | #define tcf_ht tcf_ipt_ht | ||
55 | |||
56 | #define CONFIG_NET_ACT_INIT | ||
57 | #include <net/pkt_act.h> | ||
58 | |||
59 | static int | ||
60 | ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook) | ||
61 | { | ||
62 | struct ipt_target *target; | ||
63 | int ret = 0; | ||
64 | |||
65 | target = ipt_find_target(t->u.user.name, t->u.user.revision); | ||
66 | if (!target) | ||
67 | return -ENOENT; | ||
68 | |||
69 | DPRINTK("ipt_init_target: found %s\n", target->name); | ||
70 | t->u.kernel.target = target; | ||
71 | |||
72 | if (t->u.kernel.target->checkentry | ||
73 | && !t->u.kernel.target->checkentry(table, NULL, t->data, | ||
74 | t->u.target_size - sizeof(*t), | ||
75 | hook)) { | ||
76 | DPRINTK("ipt_init_target: check failed for `%s'.\n", | ||
77 | t->u.kernel.target->name); | ||
78 | module_put(t->u.kernel.target->me); | ||
79 | ret = -EINVAL; | ||
80 | } | ||
81 | |||
82 | return ret; | ||
83 | } | ||
84 | |||
85 | static void | ||
86 | ipt_destroy_target(struct ipt_entry_target *t) | ||
87 | { | ||
88 | if (t->u.kernel.target->destroy) | ||
89 | t->u.kernel.target->destroy(t->data, | ||
90 | t->u.target_size - sizeof(*t)); | ||
91 | module_put(t->u.kernel.target->me); | ||
92 | } | ||
93 | |||
94 | static int | ||
95 | tcf_ipt_release(struct tcf_ipt *p, int bind) | ||
96 | { | ||
97 | int ret = 0; | ||
98 | if (p) { | ||
99 | if (bind) | ||
100 | p->bindcnt--; | ||
101 | p->refcnt--; | ||
102 | if (p->bindcnt <= 0 && p->refcnt <= 0) { | ||
103 | ipt_destroy_target(p->t); | ||
104 | kfree(p->tname); | ||
105 | kfree(p->t); | ||
106 | tcf_hash_destroy(p); | ||
107 | ret = ACT_P_DELETED; | ||
108 | } | ||
109 | } | ||
110 | return ret; | ||
111 | } | ||
112 | |||
113 | static int | ||
114 | tcf_ipt_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a, | ||
115 | int ovr, int bind) | ||
116 | { | ||
117 | struct rtattr *tb[TCA_IPT_MAX]; | ||
118 | struct tcf_ipt *p; | ||
119 | struct ipt_entry_target *td, *t; | ||
120 | char *tname; | ||
121 | int ret = 0, err; | ||
122 | u32 hook = 0; | ||
123 | u32 index = 0; | ||
124 | |||
125 | if (rta == NULL || rtattr_parse_nested(tb, TCA_IPT_MAX, rta) < 0) | ||
126 | return -EINVAL; | ||
127 | |||
128 | if (tb[TCA_IPT_HOOK-1] == NULL || | ||
129 | RTA_PAYLOAD(tb[TCA_IPT_HOOK-1]) < sizeof(u32)) | ||
130 | return -EINVAL; | ||
131 | if (tb[TCA_IPT_TARG-1] == NULL || | ||
132 | RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < sizeof(*t)) | ||
133 | return -EINVAL; | ||
134 | td = (struct ipt_entry_target *)RTA_DATA(tb[TCA_IPT_TARG-1]); | ||
135 | if (RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < td->u.target_size) | ||
136 | return -EINVAL; | ||
137 | |||
138 | if (tb[TCA_IPT_INDEX-1] != NULL && | ||
139 | RTA_PAYLOAD(tb[TCA_IPT_INDEX-1]) >= sizeof(u32)) | ||
140 | index = *(u32 *)RTA_DATA(tb[TCA_IPT_INDEX-1]); | ||
141 | |||
142 | p = tcf_hash_check(index, a, ovr, bind); | ||
143 | if (p == NULL) { | ||
144 | p = tcf_hash_create(index, est, a, sizeof(*p), ovr, bind); | ||
145 | if (p == NULL) | ||
146 | return -ENOMEM; | ||
147 | ret = ACT_P_CREATED; | ||
148 | } else { | ||
149 | if (!ovr) { | ||
150 | tcf_ipt_release(p, bind); | ||
151 | return -EEXIST; | ||
152 | } | ||
153 | } | ||
154 | |||
155 | hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]); | ||
156 | |||
157 | err = -ENOMEM; | ||
158 | tname = kmalloc(IFNAMSIZ, GFP_KERNEL); | ||
159 | if (tname == NULL) | ||
160 | goto err1; | ||
161 | if (tb[TCA_IPT_TABLE - 1] == NULL || | ||
162 | rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ) | ||
163 | strcpy(tname, "mangle"); | ||
164 | |||
165 | t = kmalloc(td->u.target_size, GFP_KERNEL); | ||
166 | if (t == NULL) | ||
167 | goto err2; | ||
168 | memcpy(t, td, td->u.target_size); | ||
169 | |||
170 | if ((err = ipt_init_target(t, tname, hook)) < 0) | ||
171 | goto err3; | ||
172 | |||
173 | spin_lock_bh(&p->lock); | ||
174 | if (ret != ACT_P_CREATED) { | ||
175 | ipt_destroy_target(p->t); | ||
176 | kfree(p->tname); | ||
177 | kfree(p->t); | ||
178 | } | ||
179 | p->tname = tname; | ||
180 | p->t = t; | ||
181 | p->hook = hook; | ||
182 | spin_unlock_bh(&p->lock); | ||
183 | if (ret == ACT_P_CREATED) | ||
184 | tcf_hash_insert(p); | ||
185 | return ret; | ||
186 | |||
187 | err3: | ||
188 | kfree(t); | ||
189 | err2: | ||
190 | kfree(tname); | ||
191 | err1: | ||
192 | kfree(p); | ||
193 | return err; | ||
194 | } | ||
195 | |||
196 | static int | ||
197 | tcf_ipt_cleanup(struct tc_action *a, int bind) | ||
198 | { | ||
199 | struct tcf_ipt *p = PRIV(a, ipt); | ||
200 | return tcf_ipt_release(p, bind); | ||
201 | } | ||
202 | |||
203 | static int | ||
204 | tcf_ipt(struct sk_buff **pskb, struct tc_action *a) | ||
205 | { | ||
206 | int ret = 0, result = 0; | ||
207 | struct tcf_ipt *p = PRIV(a, ipt); | ||
208 | struct sk_buff *skb = *pskb; | ||
209 | |||
210 | if (skb_cloned(skb)) { | ||
211 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | ||
212 | return TC_ACT_UNSPEC; | ||
213 | } | ||
214 | |||
215 | spin_lock(&p->lock); | ||
216 | |||
217 | p->tm.lastuse = jiffies; | ||
218 | p->bstats.bytes += skb->len; | ||
219 | p->bstats.packets++; | ||
220 | |||
221 | /* yes, we have to worry about both in and out dev | ||
222 | worry later - danger - this API seems to have changed | ||
223 | from earlier kernels */ | ||
224 | |||
225 | ret = p->t->u.kernel.target->target(&skb, skb->dev, NULL, | ||
226 | p->hook, p->t->data, NULL); | ||
227 | switch (ret) { | ||
228 | case NF_ACCEPT: | ||
229 | result = TC_ACT_OK; | ||
230 | break; | ||
231 | case NF_DROP: | ||
232 | result = TC_ACT_SHOT; | ||
233 | p->qstats.drops++; | ||
234 | break; | ||
235 | case IPT_CONTINUE: | ||
236 | result = TC_ACT_PIPE; | ||
237 | break; | ||
238 | default: | ||
239 | if (net_ratelimit()) | ||
240 | printk("Bogus netfilter code %d assume ACCEPT\n", ret); | ||
241 | result = TC_POLICE_OK; | ||
242 | break; | ||
243 | } | ||
244 | spin_unlock(&p->lock); | ||
245 | return result; | ||
246 | |||
247 | } | ||
248 | |||
249 | static int | ||
250 | tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | ||
251 | { | ||
252 | struct ipt_entry_target *t; | ||
253 | struct tcf_t tm; | ||
254 | struct tc_cnt c; | ||
255 | unsigned char *b = skb->tail; | ||
256 | struct tcf_ipt *p = PRIV(a, ipt); | ||
257 | |||
258 | /* for simple targets kernel size == user size | ||
259 | ** user name = target name | ||
260 | ** for foolproof you need to not assume this | ||
261 | */ | ||
262 | |||
263 | t = kmalloc(p->t->u.user.target_size, GFP_ATOMIC); | ||
264 | if (t == NULL) | ||
265 | goto rtattr_failure; | ||
266 | |||
267 | c.bindcnt = p->bindcnt - bind; | ||
268 | c.refcnt = p->refcnt - ref; | ||
269 | memcpy(t, p->t, p->t->u.user.target_size); | ||
270 | strcpy(t->u.user.name, p->t->u.kernel.target->name); | ||
271 | |||
272 | DPRINTK("\ttcf_ipt_dump tablename %s length %d\n", p->tname, | ||
273 | strlen(p->tname)); | ||
274 | DPRINTK("\tdump target name %s size %d size user %d " | ||
275 | "data[0] %x data[1] %x\n", p->t->u.kernel.target->name, | ||
276 | p->t->u.target_size, p->t->u.user.target_size, | ||
277 | p->t->data[0], p->t->data[1]); | ||
278 | RTA_PUT(skb, TCA_IPT_TARG, p->t->u.user.target_size, t); | ||
279 | RTA_PUT(skb, TCA_IPT_INDEX, 4, &p->index); | ||
280 | RTA_PUT(skb, TCA_IPT_HOOK, 4, &p->hook); | ||
281 | RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c); | ||
282 | RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, p->tname); | ||
283 | tm.install = jiffies_to_clock_t(jiffies - p->tm.install); | ||
284 | tm.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse); | ||
285 | tm.expires = jiffies_to_clock_t(p->tm.expires); | ||
286 | RTA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm); | ||
287 | kfree(t); | ||
288 | return skb->len; | ||
289 | |||
290 | rtattr_failure: | ||
291 | skb_trim(skb, b - skb->data); | ||
292 | kfree(t); | ||
293 | return -1; | ||
294 | } | ||
295 | |||
296 | static struct tc_action_ops act_ipt_ops = { | ||
297 | .kind = "ipt", | ||
298 | .type = TCA_ACT_IPT, | ||
299 | .capab = TCA_CAP_NONE, | ||
300 | .owner = THIS_MODULE, | ||
301 | .act = tcf_ipt, | ||
302 | .dump = tcf_ipt_dump, | ||
303 | .cleanup = tcf_ipt_cleanup, | ||
304 | .lookup = tcf_hash_search, | ||
305 | .init = tcf_ipt_init, | ||
306 | .walk = tcf_generic_walker | ||
307 | }; | ||
308 | |||
309 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | ||
310 | MODULE_DESCRIPTION("Iptables target actions"); | ||
311 | MODULE_LICENSE("GPL"); | ||
312 | |||
313 | static int __init | ||
314 | ipt_init_module(void) | ||
315 | { | ||
316 | return tcf_register_action(&act_ipt_ops); | ||
317 | } | ||
318 | |||
319 | static void __exit | ||
320 | ipt_cleanup_module(void) | ||
321 | { | ||
322 | tcf_unregister_action(&act_ipt_ops); | ||
323 | } | ||
324 | |||
325 | module_init(ipt_init_module); | ||
326 | module_exit(ipt_cleanup_module); | ||