Commit | Line | Data |
---|---|---|
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 | |
ddf97ccd WC |
28 | static int pedit_net_id; |
29 | ||
53b2bf3f | 30 | static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { |
53f7e35f | 31 | [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) }, |
53b2bf3f PM |
32 | }; |
33 | ||
c1b52739 BL |
34 | static int tcf_pedit_init(struct net *net, struct nlattr *nla, |
35 | struct nlattr *est, struct tc_action *a, | |
36 | int ovr, int bind) | |
1da177e4 | 37 | { |
ddf97ccd | 38 | struct tc_action_net *tn = net_generic(net, pedit_net_id); |
7ba699c6 | 39 | struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
1da177e4 | 40 | struct tc_pedit *parm; |
cee63723 | 41 | int ret = 0, err; |
1da177e4 LT |
42 | struct tcf_pedit *p; |
43 | struct tc_pedit_key *keys = NULL; | |
44 | int ksize; | |
45 | ||
cee63723 | 46 | if (nla == NULL) |
1da177e4 LT |
47 | return -EINVAL; |
48 | ||
53b2bf3f | 49 | err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); |
cee63723 PM |
50 | if (err < 0) |
51 | return err; | |
52 | ||
53b2bf3f | 53 | if (tb[TCA_PEDIT_PARMS] == NULL) |
1da177e4 | 54 | return -EINVAL; |
7ba699c6 | 55 | parm = nla_data(tb[TCA_PEDIT_PARMS]); |
1da177e4 | 56 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
7ba699c6 | 57 | if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) |
1da177e4 LT |
58 | return -EINVAL; |
59 | ||
ddf97ccd | 60 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
1da177e4 LT |
61 | if (!parm->nkeys) |
62 | return -EINVAL; | |
ddf97ccd WC |
63 | ret = tcf_hash_create(tn, parm->index, est, a, |
64 | sizeof(*p), bind, false); | |
86062033 WC |
65 | if (ret) |
66 | return ret; | |
67 | p = to_pedit(a); | |
1da177e4 LT |
68 | keys = kmalloc(ksize, GFP_KERNEL); |
69 | if (keys == NULL) { | |
86062033 | 70 | tcf_hash_cleanup(a, est); |
1da177e4 LT |
71 | return -ENOMEM; |
72 | } | |
73 | ret = ACT_P_CREATED; | |
74 | } else { | |
1a29321e JHS |
75 | if (bind) |
76 | return 0; | |
5175f710 | 77 | tcf_hash_release(a, bind); |
1a29321e | 78 | if (!ovr) |
1da177e4 | 79 | return -EEXIST; |
5175f710 | 80 | p = to_pedit(a); |
e9ce1cd3 | 81 | if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { |
1da177e4 LT |
82 | keys = kmalloc(ksize, GFP_KERNEL); |
83 | if (keys == NULL) | |
84 | return -ENOMEM; | |
85 | } | |
86 | } | |
87 | ||
e9ce1cd3 DM |
88 | spin_lock_bh(&p->tcf_lock); |
89 | p->tcfp_flags = parm->flags; | |
90 | p->tcf_action = parm->action; | |
1da177e4 | 91 | if (keys) { |
e9ce1cd3 DM |
92 | kfree(p->tcfp_keys); |
93 | p->tcfp_keys = keys; | |
94 | p->tcfp_nkeys = parm->nkeys; | |
1da177e4 | 95 | } |
e9ce1cd3 DM |
96 | memcpy(p->tcfp_keys, parm->keys, ksize); |
97 | spin_unlock_bh(&p->tcf_lock); | |
1da177e4 | 98 | if (ret == ACT_P_CREATED) |
ddf97ccd | 99 | tcf_hash_insert(tn, a); |
1da177e4 LT |
100 | return ret; |
101 | } | |
102 | ||
a5b5c958 | 103 | static void tcf_pedit_cleanup(struct tc_action *a, int bind) |
1da177e4 | 104 | { |
e9ce1cd3 | 105 | struct tcf_pedit *p = a->priv; |
a5b5c958 WC |
106 | struct tc_pedit_key *keys = p->tcfp_keys; |
107 | kfree(keys); | |
1da177e4 LT |
108 | } |
109 | ||
dc7f9f6e | 110 | static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 111 | struct tcf_result *res) |
1da177e4 | 112 | { |
e9ce1cd3 | 113 | struct tcf_pedit *p = a->priv; |
4749c3ef | 114 | int i; |
db2c2417 | 115 | unsigned int off; |
1da177e4 | 116 | |
14bbd6a5 | 117 | if (skb_unclone(skb, GFP_ATOMIC)) |
cc7ec456 | 118 | return p->tcf_action; |
1da177e4 | 119 | |
db2c2417 | 120 | off = skb_network_offset(skb); |
1da177e4 | 121 | |
e9ce1cd3 | 122 | spin_lock(&p->tcf_lock); |
1da177e4 | 123 | |
e9ce1cd3 | 124 | p->tcf_tm.lastuse = jiffies; |
1da177e4 | 125 | |
e9ce1cd3 DM |
126 | if (p->tcfp_nkeys > 0) { |
127 | struct tc_pedit_key *tkey = p->tcfp_keys; | |
1da177e4 | 128 | |
e9ce1cd3 | 129 | for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
db2c2417 | 130 | u32 *ptr, _data; |
1da177e4 LT |
131 | int offset = tkey->off; |
132 | ||
133 | if (tkey->offmask) { | |
db2c2417 CG |
134 | char *d, _d; |
135 | ||
136 | d = skb_header_pointer(skb, off + tkey->at, 1, | |
137 | &_d); | |
138 | if (!d) | |
1da177e4 | 139 | goto bad; |
db2c2417 | 140 | offset += (*d & tkey->offmask) >> tkey->shift; |
1da177e4 LT |
141 | } |
142 | ||
143 | if (offset % 4) { | |
6ff9c364 | 144 | pr_info("tc filter pedit" |
145 | " offset must be on 32 bit boundaries\n"); | |
1da177e4 LT |
146 | goto bad; |
147 | } | |
75202e76 | 148 | if (offset > 0 && offset > skb->len) { |
6ff9c364 | 149 | pr_info("tc filter pedit" |
25985edc | 150 | " offset %d can't exceed pkt length %d\n", |
1da177e4 LT |
151 | offset, skb->len); |
152 | goto bad; | |
153 | } | |
154 | ||
db2c2417 CG |
155 | ptr = skb_header_pointer(skb, off + offset, 4, &_data); |
156 | if (!ptr) | |
157 | goto bad; | |
1da177e4 LT |
158 | /* just do it, baby */ |
159 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); | |
db2c2417 CG |
160 | if (ptr == &_data) |
161 | skb_store_bits(skb, off + offset, ptr, 4); | |
1da177e4 | 162 | } |
10297b99 | 163 | |
1da177e4 | 164 | goto done; |
6ff9c364 | 165 | } else |
166 | WARN(1, "pedit BUG: index %d\n", p->tcf_index); | |
1da177e4 LT |
167 | |
168 | bad: | |
e9ce1cd3 | 169 | p->tcf_qstats.overlimits++; |
1da177e4 | 170 | done: |
bfe0d029 | 171 | bstats_update(&p->tcf_bstats, skb); |
e9ce1cd3 DM |
172 | spin_unlock(&p->tcf_lock); |
173 | return p->tcf_action; | |
1da177e4 LT |
174 | } |
175 | ||
e9ce1cd3 DM |
176 | static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, |
177 | int bind, int ref) | |
1da177e4 | 178 | { |
27a884dc | 179 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 180 | struct tcf_pedit *p = a->priv; |
1da177e4 | 181 | struct tc_pedit *opt; |
1da177e4 | 182 | struct tcf_t t; |
10297b99 YH |
183 | int s; |
184 | ||
e9ce1cd3 | 185 | s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key); |
1da177e4 LT |
186 | |
187 | /* netlink spinlocks held above us - must use ATOMIC */ | |
0da974f4 | 188 | opt = kzalloc(s, GFP_ATOMIC); |
e9ce1cd3 | 189 | if (unlikely(!opt)) |
1da177e4 | 190 | return -ENOBUFS; |
1da177e4 | 191 | |
e9ce1cd3 DM |
192 | memcpy(opt->keys, p->tcfp_keys, |
193 | p->tcfp_nkeys * sizeof(struct tc_pedit_key)); | |
194 | opt->index = p->tcf_index; | |
195 | opt->nkeys = p->tcfp_nkeys; | |
196 | opt->flags = p->tcfp_flags; | |
197 | opt->action = p->tcf_action; | |
198 | opt->refcnt = p->tcf_refcnt - ref; | |
199 | opt->bindcnt = p->tcf_bindcnt - bind; | |
1da177e4 | 200 | |
1b34ec43 DM |
201 | if (nla_put(skb, TCA_PEDIT_PARMS, s, opt)) |
202 | goto nla_put_failure; | |
e9ce1cd3 DM |
203 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); |
204 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); | |
205 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); | |
1b34ec43 DM |
206 | if (nla_put(skb, TCA_PEDIT_TM, sizeof(t), &t)) |
207 | goto nla_put_failure; | |
541673c8 | 208 | kfree(opt); |
1da177e4 LT |
209 | return skb->len; |
210 | ||
7ba699c6 | 211 | nla_put_failure: |
dc5fc579 | 212 | nlmsg_trim(skb, b); |
541673c8 | 213 | kfree(opt); |
1da177e4 LT |
214 | return -1; |
215 | } | |
216 | ||
ddf97ccd WC |
217 | static int tcf_pedit_walker(struct net *net, struct sk_buff *skb, |
218 | struct netlink_callback *cb, int type, | |
219 | struct tc_action *a) | |
220 | { | |
221 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
222 | ||
223 | return tcf_generic_walker(tn, skb, cb, type, a); | |
224 | } | |
225 | ||
226 | static int tcf_pedit_search(struct net *net, struct tc_action *a, u32 index) | |
227 | { | |
228 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
229 | ||
230 | return tcf_hash_search(tn, a, index); | |
231 | } | |
232 | ||
e9ce1cd3 | 233 | static struct tc_action_ops act_pedit_ops = { |
1da177e4 LT |
234 | .kind = "pedit", |
235 | .type = TCA_ACT_PEDIT, | |
1da177e4 LT |
236 | .owner = THIS_MODULE, |
237 | .act = tcf_pedit, | |
238 | .dump = tcf_pedit_dump, | |
239 | .cleanup = tcf_pedit_cleanup, | |
1da177e4 | 240 | .init = tcf_pedit_init, |
ddf97ccd WC |
241 | .walk = tcf_pedit_walker, |
242 | .lookup = tcf_pedit_search, | |
243 | }; | |
244 | ||
245 | static __net_init int pedit_init_net(struct net *net) | |
246 | { | |
247 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
248 | ||
249 | return tc_action_net_init(tn, &act_pedit_ops, PEDIT_TAB_MASK); | |
250 | } | |
251 | ||
252 | static void __net_exit pedit_exit_net(struct net *net) | |
253 | { | |
254 | struct tc_action_net *tn = net_generic(net, pedit_net_id); | |
255 | ||
256 | tc_action_net_exit(tn); | |
257 | } | |
258 | ||
259 | static struct pernet_operations pedit_net_ops = { | |
260 | .init = pedit_init_net, | |
261 | .exit = pedit_exit_net, | |
262 | .id = &pedit_net_id, | |
263 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
264 | }; |
265 | ||
266 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
267 | MODULE_DESCRIPTION("Generic Packet Editor actions"); | |
268 | MODULE_LICENSE("GPL"); | |
269 | ||
e9ce1cd3 | 270 | static int __init pedit_init_module(void) |
1da177e4 | 271 | { |
ddf97ccd | 272 | return tcf_register_action(&act_pedit_ops, &pedit_net_ops); |
1da177e4 LT |
273 | } |
274 | ||
e9ce1cd3 | 275 | static void __exit pedit_cleanup_module(void) |
1da177e4 | 276 | { |
ddf97ccd | 277 | tcf_unregister_action(&act_pedit_ops, &pedit_net_ops); |
1da177e4 LT |
278 | } |
279 | ||
280 | module_init(pedit_init_module); | |
281 | module_exit(pedit_cleanup_module); | |
282 |