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Commit | Line | Data |
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1da177e4 | 1 | /* |
0c6965dd | 2 | * net/sched/act_pedit.c Generic packet editor |
1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> | |
1da177e4 | 14 | #include <linux/string.h> |
1da177e4 | 15 | #include <linux/errno.h> |
1da177e4 LT |
16 | #include <linux/skbuff.h> |
17 | #include <linux/rtnetlink.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
dc5fc579 | 21 | #include <net/netlink.h> |
1da177e4 LT |
22 | #include <net/pkt_sched.h> |
23 | #include <linux/tc_act/tc_pedit.h> | |
24 | #include <net/tc_act/tc_pedit.h> | |
25 | ||
e9ce1cd3 | 26 | #define PEDIT_TAB_MASK 15 |
1da177e4 | 27 | |
c7d03a00 | 28 | static unsigned int pedit_net_id; |
a85a970a | 29 | static struct tc_action_ops act_pedit_ops; |
ddf97ccd | 30 | |
53b2bf3f | 31 | static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { |
53f7e35f | 32 | [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) }, |
53b2bf3f PM |
33 | }; |
34 | ||
c1b52739 | 35 | static int tcf_pedit_init(struct net *net, struct nlattr *nla, |
a85a970a | 36 | struct nlattr *est, struct tc_action **a, |
c1b52739 | 37 | int ovr, int bind) |
1da177e4 | 38 | { |
ddf97ccd | 39 | struct tc_action_net *tn = net_generic(net, pedit_net_id); |
7ba699c6 | 40 | struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
1da177e4 | 41 | struct tc_pedit *parm; |
cee63723 | 42 | int ret = 0, err; |
1da177e4 LT |
43 | struct tcf_pedit *p; |
44 | struct tc_pedit_key *keys = NULL; | |
45 | int ksize; | |
46 | ||
cee63723 | 47 | if (nla == NULL) |
1da177e4 LT |
48 | return -EINVAL; |
49 | ||
53b2bf3f | 50 | err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); |
cee63723 PM |
51 | if (err < 0) |
52 | return err; | |
53 | ||
53b2bf3f | 54 | if (tb[TCA_PEDIT_PARMS] == NULL) |
1da177e4 | 55 | return -EINVAL; |
7ba699c6 | 56 | parm = nla_data(tb[TCA_PEDIT_PARMS]); |
1da177e4 | 57 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
7ba699c6 | 58 | if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) |
1da177e4 LT |
59 | return -EINVAL; |
60 | ||
ddf97ccd | 61 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
1da177e4 LT |
62 | if (!parm->nkeys) |
63 | return -EINVAL; | |
ddf97ccd | 64 | ret = tcf_hash_create(tn, parm->index, est, a, |
a85a970a | 65 | &act_pedit_ops, bind, false); |
86062033 WC |
66 | if (ret) |
67 | return ret; | |
a85a970a | 68 | p = to_pedit(*a); |
1da177e4 LT |
69 | keys = kmalloc(ksize, GFP_KERNEL); |
70 | if (keys == NULL) { | |
a85a970a | 71 | tcf_hash_cleanup(*a, est); |
1da177e4 LT |
72 | return -ENOMEM; |
73 | } | |
74 | ret = ACT_P_CREATED; | |
75 | } else { | |
1a29321e JHS |
76 | if (bind) |
77 | return 0; | |
a85a970a | 78 | tcf_hash_release(*a, bind); |
1a29321e | 79 | if (!ovr) |
1da177e4 | 80 | return -EEXIST; |
a85a970a | 81 | p = to_pedit(*a); |
e9ce1cd3 | 82 | if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { |
1da177e4 LT |
83 | keys = kmalloc(ksize, GFP_KERNEL); |
84 | if (keys == NULL) | |
85 | return -ENOMEM; | |
86 | } | |
87 | } | |
88 | ||
e9ce1cd3 DM |
89 | spin_lock_bh(&p->tcf_lock); |
90 | p->tcfp_flags = parm->flags; | |
91 | p->tcf_action = parm->action; | |
1da177e4 | 92 | if (keys) { |
e9ce1cd3 DM |
93 | kfree(p->tcfp_keys); |
94 | p->tcfp_keys = keys; | |
95 | p->tcfp_nkeys = parm->nkeys; | |
1da177e4 | 96 | } |
e9ce1cd3 DM |
97 | memcpy(p->tcfp_keys, parm->keys, ksize); |
98 | spin_unlock_bh(&p->tcf_lock); | |
1da177e4 | 99 | if (ret == ACT_P_CREATED) |
a85a970a | 100 | tcf_hash_insert(tn, *a); |
1da177e4 LT |
101 | return ret; |
102 | } | |
103 | ||
a5b5c958 | 104 | static void tcf_pedit_cleanup(struct tc_action *a, int bind) |
1da177e4 | 105 | { |
a85a970a | 106 | struct tcf_pedit *p = to_pedit(a); |
a5b5c958 WC |
107 | struct tc_pedit_key *keys = p->tcfp_keys; |
108 | kfree(keys); | |
1da177e4 LT |
109 | } |
110 | ||
95c2027b AV |
111 | static bool offset_valid(struct sk_buff *skb, int offset) |
112 | { | |
113 | if (offset > 0 && offset > skb->len) | |
114 | return false; | |
115 | ||
116 | if (offset < 0 && -offset > skb_headroom(skb)) | |
117 | return false; | |
118 | ||
119 | return true; | |
120 | } | |
121 | ||
dc7f9f6e | 122 | static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 123 | struct tcf_result *res) |
1da177e4 | 124 | { |
a85a970a | 125 | struct tcf_pedit *p = to_pedit(a); |
4749c3ef | 126 | int i; |
db2c2417 | 127 | unsigned int off; |
1da177e4 | 128 | |
14bbd6a5 | 129 | if (skb_unclone(skb, GFP_ATOMIC)) |
cc7ec456 | 130 | return p->tcf_action; |
1da177e4 | 131 | |
db2c2417 | 132 | off = skb_network_offset(skb); |
1da177e4 | 133 | |
e9ce1cd3 | 134 | spin_lock(&p->tcf_lock); |
1da177e4 | 135 | |
9c4a4e48 | 136 | tcf_lastuse_update(&p->tcf_tm); |
1da177e4 | 137 | |
e9ce1cd3 DM |
138 | if (p->tcfp_nkeys > 0) { |
139 | struct tc_pedit_key *tkey = p->tcfp_keys; | |
1da177e4 | 140 | |
e9ce1cd3 | 141 | for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
db2c2417 | 142 | u32 *ptr, _data; |
1da177e4 LT |
143 | int offset = tkey->off; |
144 | ||
145 | if (tkey->offmask) { | |
db2c2417 CG |
146 | char *d, _d; |
147 | ||
95c2027b AV |
148 | if (!offset_valid(skb, off + tkey->at)) { |
149 | pr_info("tc filter pedit 'at' offset %d out of bounds\n", | |
150 | off + tkey->at); | |
151 | goto bad; | |
152 | } | |
db2c2417 CG |
153 | d = skb_header_pointer(skb, off + tkey->at, 1, |
154 | &_d); | |
155 | if (!d) | |
1da177e4 | 156 | goto bad; |
db2c2417 | 157 | offset += (*d & tkey->offmask) >> tkey->shift; |
1da177e4 LT |
158 | } |
159 | ||
160 | if (offset % 4) { | |
6ff9c364 | 161 | pr_info("tc filter pedit" |
162 | " offset must be on 32 bit boundaries\n"); | |
1da177e4 LT |
163 | goto bad; |
164 | } | |
95c2027b AV |
165 | |
166 | if (!offset_valid(skb, off + offset)) { | |
167 | pr_info("tc filter pedit offset %d out of bounds\n", | |
168 | offset); | |
1da177e4 LT |
169 | goto bad; |
170 | } | |
171 | ||
db2c2417 CG |
172 | ptr = skb_header_pointer(skb, off + offset, 4, &_data); |
173 | if (!ptr) | |
174 | goto bad; | |
1da177e4 LT |
175 | /* just do it, baby */ |
176 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); | |
db2c2417 CG |
177 | if (ptr == &_data) |
178 | skb_store_bits(skb, off + offset, ptr, 4); | |
1da177e4 | 179 | } |
10297b99 | 180 | |
1da177e4 | 181 | goto done; |
6ff9c364 | 182 | } else |
183 | WARN(1, "pedit BUG: index %d\n", p->tcf_index); | |
1da177e4 LT |
184 | |
185 | bad: | |
e9ce1cd3 | 186 | p->tcf_qstats.overlimits++; |
1da177e4 | 187 | done: |
bfe0d029 | 188 | bstats_update(&p->tcf_bstats, skb); |
e9ce1cd3 DM |
189 | spin_unlock(&p->tcf_lock); |
190 | return p->tcf_action; | |
1da177e4 LT |
191 | } |
192 | ||
e9ce1cd3 DM |
193 | static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, |
194 | int bind, int ref) | |
1da177e4 | 195 | { |
27a884dc | 196 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 197 | struct tcf_pedit *p = to_pedit(a); |
1da177e4 | 198 | struct tc_pedit *opt; |
1da177e4 | 199 | struct tcf_t t; |
10297b99 YH |
200 | int s; |
201 | ||
e9ce1cd3 | 202 | s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key); |
1da177e4 LT |
203 | |
204 | /* netlink spinlocks held above us - must use ATOMIC */ | |
0da974f4 | 205 | opt = kzalloc(s, GFP_ATOMIC); |
e9ce1cd3 | 206 | if (unlikely(!opt)) |
1da177e4 | 207 | return -ENOBUFS; |
1da177e4 | 208 | |
e9ce1cd3 DM |
209 | memcpy(opt->keys, p->tcfp_keys, |
210 | p->tcfp_nkeys * sizeof(struct tc_pedit_key)); | |
211 | opt->index = p->tcf_index; | |
212 | opt->nkeys = p->tcfp_nkeys; | |
213 | opt->flags = p->tcfp_flags; | |
214 | opt->action = p->tcf_action; | |
215 | opt->refcnt = p->tcf_refcnt - ref; | |
216 | opt->bindcnt = p->tcf_bindcnt - bind; | |
1da177e4 | 217 | |
1b34ec43 DM |
218 | if (nla_put(skb, TCA_PEDIT_PARMS, s, opt)) |
219 | goto nla_put_failure; | |
48d8ee16 JHS |
220 | |
221 | tcf_tm_dump(&t, &p->tcf_tm); | |
9854518e | 222 | if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD)) |
1b34ec43 | 223 | goto nla_put_failure; |
48d8ee16 | 224 | |
541673c8 | 225 | kfree(opt); |
1da177e4 LT |
226 | return skb->len; |
227 | ||
7ba699c6 | 228 | nla_put_failure: |
dc5fc579 | 229 | nlmsg_trim(skb, b); |
541673c8 | 230 | kfree(opt); |
1da177e4 LT |
231 | return -1; |
232 | } | |
233 | ||
ddf97ccd WC |
234 | static int tcf_pedit_walker(struct net *net, struct sk_buff *skb, |
235 | struct netlink_callback *cb, int type, | |
a85a970a | 236 | const struct tc_action_ops *ops) |
ddf97ccd WC |
237 | { |
238 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
239 | ||
a85a970a | 240 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
241 | } |
242 | ||
a85a970a | 243 | static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
244 | { |
245 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
246 | ||
247 | return tcf_hash_search(tn, a, index); | |
248 | } | |
249 | ||
e9ce1cd3 | 250 | static struct tc_action_ops act_pedit_ops = { |
1da177e4 LT |
251 | .kind = "pedit", |
252 | .type = TCA_ACT_PEDIT, | |
1da177e4 LT |
253 | .owner = THIS_MODULE, |
254 | .act = tcf_pedit, | |
255 | .dump = tcf_pedit_dump, | |
256 | .cleanup = tcf_pedit_cleanup, | |
1da177e4 | 257 | .init = tcf_pedit_init, |
ddf97ccd WC |
258 | .walk = tcf_pedit_walker, |
259 | .lookup = tcf_pedit_search, | |
a85a970a | 260 | .size = sizeof(struct tcf_pedit), |
ddf97ccd WC |
261 | }; |
262 | ||
263 | static __net_init int pedit_init_net(struct net *net) | |
264 | { | |
265 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
266 | ||
267 | return tc_action_net_init(tn, &act_pedit_ops, PEDIT_TAB_MASK); | |
268 | } | |
269 | ||
270 | static void __net_exit pedit_exit_net(struct net *net) | |
271 | { | |
272 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
273 | ||
274 | tc_action_net_exit(tn); | |
275 | } | |
276 | ||
277 | static struct pernet_operations pedit_net_ops = { | |
278 | .init = pedit_init_net, | |
279 | .exit = pedit_exit_net, | |
280 | .id = &pedit_net_id, | |
281 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
282 | }; |
283 | ||
284 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
285 | MODULE_DESCRIPTION("Generic Packet Editor actions"); | |
286 | MODULE_LICENSE("GPL"); | |
287 | ||
e9ce1cd3 | 288 | static int __init pedit_init_module(void) |
1da177e4 | 289 | { |
ddf97ccd | 290 | return tcf_register_action(&act_pedit_ops, &pedit_net_ops); |
1da177e4 LT |
291 | } |
292 | ||
e9ce1cd3 | 293 | static void __exit pedit_cleanup_module(void) |
1da177e4 | 294 | { |
ddf97ccd | 295 | tcf_unregister_action(&act_pedit_ops, &pedit_net_ops); |
1da177e4 LT |
296 | } |
297 | ||
298 | module_init(pedit_init_module); | |
299 | module_exit(pedit_cleanup_module); | |
300 |