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1da177e4 LT |
1 | /* |
2 | * net/sched/pedit.c Generic packet editor | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Jamal Hadi Salim (2002-4) | |
10 | */ | |
11 | ||
12 | #include <asm/uaccess.h> | |
13 | #include <asm/system.h> | |
14 | #include <asm/bitops.h> | |
15 | #include <linux/config.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/rtnetlink.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <net/sock.h> | |
33 | #include <net/pkt_sched.h> | |
34 | #include <linux/tc_act/tc_pedit.h> | |
35 | #include <net/tc_act/tc_pedit.h> | |
36 | ||
37 | ||
38 | #define PEDIT_DEB 1 | |
39 | ||
40 | /* use generic hash table */ | |
41 | #define MY_TAB_SIZE 16 | |
42 | #define MY_TAB_MASK 15 | |
43 | static u32 idx_gen; | |
44 | static struct tcf_pedit *tcf_pedit_ht[MY_TAB_SIZE]; | |
45 | static DEFINE_RWLOCK(pedit_lock); | |
46 | ||
47 | #define tcf_st tcf_pedit | |
48 | #define tc_st tc_pedit | |
49 | #define tcf_t_lock pedit_lock | |
50 | #define tcf_ht tcf_pedit_ht | |
51 | ||
52 | #define CONFIG_NET_ACT_INIT 1 | |
53 | #include <net/pkt_act.h> | |
54 | ||
55 | static int | |
56 | tcf_pedit_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a, | |
57 | int ovr, int bind) | |
58 | { | |
59 | struct rtattr *tb[TCA_PEDIT_MAX]; | |
60 | struct tc_pedit *parm; | |
61 | int ret = 0; | |
62 | struct tcf_pedit *p; | |
63 | struct tc_pedit_key *keys = NULL; | |
64 | int ksize; | |
65 | ||
66 | if (rta == NULL || rtattr_parse_nested(tb, TCA_PEDIT_MAX, rta) < 0) | |
67 | return -EINVAL; | |
68 | ||
69 | if (tb[TCA_PEDIT_PARMS - 1] == NULL || | |
70 | RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm)) | |
71 | return -EINVAL; | |
72 | parm = RTA_DATA(tb[TCA_PEDIT_PARMS-1]); | |
73 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); | |
74 | if (RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm) + ksize) | |
75 | return -EINVAL; | |
76 | ||
77 | p = tcf_hash_check(parm->index, a, ovr, bind); | |
78 | if (p == NULL) { | |
79 | if (!parm->nkeys) | |
80 | return -EINVAL; | |
81 | p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind); | |
82 | if (p == NULL) | |
83 | return -ENOMEM; | |
84 | keys = kmalloc(ksize, GFP_KERNEL); | |
85 | if (keys == NULL) { | |
86 | kfree(p); | |
87 | return -ENOMEM; | |
88 | } | |
89 | ret = ACT_P_CREATED; | |
90 | } else { | |
91 | if (!ovr) { | |
92 | tcf_hash_release(p, bind); | |
93 | return -EEXIST; | |
94 | } | |
95 | if (p->nkeys && p->nkeys != parm->nkeys) { | |
96 | keys = kmalloc(ksize, GFP_KERNEL); | |
97 | if (keys == NULL) | |
98 | return -ENOMEM; | |
99 | } | |
100 | } | |
101 | ||
102 | spin_lock_bh(&p->lock); | |
103 | p->flags = parm->flags; | |
104 | p->action = parm->action; | |
105 | if (keys) { | |
106 | kfree(p->keys); | |
107 | p->keys = keys; | |
108 | p->nkeys = parm->nkeys; | |
109 | } | |
110 | memcpy(p->keys, parm->keys, ksize); | |
111 | spin_unlock_bh(&p->lock); | |
112 | if (ret == ACT_P_CREATED) | |
113 | tcf_hash_insert(p); | |
114 | return ret; | |
115 | } | |
116 | ||
117 | static int | |
118 | tcf_pedit_cleanup(struct tc_action *a, int bind) | |
119 | { | |
120 | struct tcf_pedit *p = PRIV(a, pedit); | |
121 | ||
122 | if (p != NULL) { | |
123 | struct tc_pedit_key *keys = p->keys; | |
124 | if (tcf_hash_release(p, bind)) { | |
125 | kfree(keys); | |
126 | return 1; | |
127 | } | |
128 | } | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static int | |
133 | tcf_pedit(struct sk_buff **pskb, struct tc_action *a) | |
134 | { | |
135 | struct tcf_pedit *p = PRIV(a, pedit); | |
136 | struct sk_buff *skb = *pskb; | |
137 | int i, munged = 0; | |
138 | u8 *pptr; | |
139 | ||
140 | if (!(skb->tc_verd & TC_OK2MUNGE)) { | |
141 | /* should we set skb->cloned? */ | |
142 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { | |
143 | return p->action; | |
144 | } | |
145 | } | |
146 | ||
147 | pptr = skb->nh.raw; | |
148 | ||
149 | spin_lock(&p->lock); | |
150 | ||
151 | p->tm.lastuse = jiffies; | |
152 | ||
153 | if (p->nkeys > 0) { | |
154 | struct tc_pedit_key *tkey = p->keys; | |
155 | ||
156 | for (i = p->nkeys; i > 0; i--, tkey++) { | |
157 | u32 *ptr; | |
158 | int offset = tkey->off; | |
159 | ||
160 | if (tkey->offmask) { | |
161 | if (skb->len > tkey->at) { | |
162 | char *j = pptr + tkey->at; | |
163 | offset += ((*j & tkey->offmask) >> | |
164 | tkey->shift); | |
165 | } else { | |
166 | goto bad; | |
167 | } | |
168 | } | |
169 | ||
170 | if (offset % 4) { | |
171 | printk("offset must be on 32 bit boundaries\n"); | |
172 | goto bad; | |
173 | } | |
174 | if (skb->len < 0 || (offset > 0 && offset > skb->len)) { | |
175 | printk("offset %d cant exceed pkt length %d\n", | |
176 | offset, skb->len); | |
177 | goto bad; | |
178 | } | |
179 | ||
180 | ptr = (u32 *)(pptr+offset); | |
181 | /* just do it, baby */ | |
182 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); | |
183 | munged++; | |
184 | } | |
185 | ||
186 | if (munged) | |
187 | skb->tc_verd = SET_TC_MUNGED(skb->tc_verd); | |
188 | goto done; | |
189 | } else { | |
190 | printk("pedit BUG: index %d\n",p->index); | |
191 | } | |
192 | ||
193 | bad: | |
194 | p->qstats.overlimits++; | |
195 | done: | |
196 | p->bstats.bytes += skb->len; | |
197 | p->bstats.packets++; | |
198 | spin_unlock(&p->lock); | |
199 | return p->action; | |
200 | } | |
201 | ||
202 | static int | |
203 | tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,int bind, int ref) | |
204 | { | |
205 | unsigned char *b = skb->tail; | |
206 | struct tc_pedit *opt; | |
207 | struct tcf_pedit *p = PRIV(a, pedit); | |
208 | struct tcf_t t; | |
209 | int s; | |
210 | ||
211 | s = sizeof(*opt) + p->nkeys * sizeof(struct tc_pedit_key); | |
212 | ||
213 | /* netlink spinlocks held above us - must use ATOMIC */ | |
214 | opt = kmalloc(s, GFP_ATOMIC); | |
215 | if (opt == NULL) | |
216 | return -ENOBUFS; | |
217 | memset(opt, 0, s); | |
218 | ||
219 | memcpy(opt->keys, p->keys, p->nkeys * sizeof(struct tc_pedit_key)); | |
220 | opt->index = p->index; | |
221 | opt->nkeys = p->nkeys; | |
222 | opt->flags = p->flags; | |
223 | opt->action = p->action; | |
224 | opt->refcnt = p->refcnt - ref; | |
225 | opt->bindcnt = p->bindcnt - bind; | |
226 | ||
227 | ||
228 | #ifdef PEDIT_DEB | |
229 | { | |
230 | /* Debug - get rid of later */ | |
231 | int i; | |
232 | struct tc_pedit_key *key = opt->keys; | |
233 | ||
234 | for (i=0; i<opt->nkeys; i++, key++) { | |
235 | printk( "\n key #%d",i); | |
236 | printk( " at %d: val %08x mask %08x", | |
237 | (unsigned int)key->off, | |
238 | (unsigned int)key->val, | |
239 | (unsigned int)key->mask); | |
240 | } | |
241 | } | |
242 | #endif | |
243 | ||
244 | RTA_PUT(skb, TCA_PEDIT_PARMS, s, opt); | |
245 | t.install = jiffies_to_clock_t(jiffies - p->tm.install); | |
246 | t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse); | |
247 | t.expires = jiffies_to_clock_t(p->tm.expires); | |
248 | RTA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t); | |
249 | return skb->len; | |
250 | ||
251 | rtattr_failure: | |
252 | skb_trim(skb, b - skb->data); | |
253 | return -1; | |
254 | } | |
255 | ||
256 | static | |
257 | struct tc_action_ops act_pedit_ops = { | |
258 | .kind = "pedit", | |
259 | .type = TCA_ACT_PEDIT, | |
260 | .capab = TCA_CAP_NONE, | |
261 | .owner = THIS_MODULE, | |
262 | .act = tcf_pedit, | |
263 | .dump = tcf_pedit_dump, | |
264 | .cleanup = tcf_pedit_cleanup, | |
265 | .lookup = tcf_hash_search, | |
266 | .init = tcf_pedit_init, | |
267 | .walk = tcf_generic_walker | |
268 | }; | |
269 | ||
270 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
271 | MODULE_DESCRIPTION("Generic Packet Editor actions"); | |
272 | MODULE_LICENSE("GPL"); | |
273 | ||
274 | static int __init | |
275 | pedit_init_module(void) | |
276 | { | |
277 | return tcf_register_action(&act_pedit_ops); | |
278 | } | |
279 | ||
280 | static void __exit | |
281 | pedit_cleanup_module(void) | |
282 | { | |
283 | tcf_unregister_action(&act_pedit_ops); | |
284 | } | |
285 | ||
286 | module_init(pedit_init_module); | |
287 | module_exit(pedit_cleanup_module); | |
288 |