Commit | Line | Data |
---|---|---|
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 | ||
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 | |
53b2bf3f | 28 | static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { |
53f7e35f | 29 | [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) }, |
53b2bf3f PM |
30 | }; |
31 | ||
c1b52739 BL |
32 | static int tcf_pedit_init(struct net *net, struct nlattr *nla, |
33 | struct nlattr *est, struct tc_action *a, | |
34 | int ovr, int bind) | |
1da177e4 | 35 | { |
7ba699c6 | 36 | struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
1da177e4 | 37 | struct tc_pedit *parm; |
cee63723 | 38 | int ret = 0, err; |
1da177e4 LT |
39 | struct tcf_pedit *p; |
40 | struct tc_pedit_key *keys = NULL; | |
41 | int ksize; | |
42 | ||
cee63723 | 43 | if (nla == NULL) |
1da177e4 LT |
44 | return -EINVAL; |
45 | ||
53b2bf3f | 46 | err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); |
cee63723 PM |
47 | if (err < 0) |
48 | return err; | |
49 | ||
53b2bf3f | 50 | if (tb[TCA_PEDIT_PARMS] == NULL) |
1da177e4 | 51 | return -EINVAL; |
7ba699c6 | 52 | parm = nla_data(tb[TCA_PEDIT_PARMS]); |
1da177e4 | 53 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
7ba699c6 | 54 | if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) |
1da177e4 LT |
55 | return -EINVAL; |
56 | ||
86062033 | 57 | if (!tcf_hash_check(parm->index, a, bind)) { |
1da177e4 LT |
58 | if (!parm->nkeys) |
59 | return -EINVAL; | |
86062033 WC |
60 | ret = tcf_hash_create(parm->index, est, a, sizeof(*p), bind); |
61 | if (ret) | |
62 | return ret; | |
63 | p = to_pedit(a); | |
1da177e4 LT |
64 | keys = kmalloc(ksize, GFP_KERNEL); |
65 | if (keys == NULL) { | |
86062033 | 66 | tcf_hash_cleanup(a, est); |
1da177e4 LT |
67 | return -ENOMEM; |
68 | } | |
69 | ret = ACT_P_CREATED; | |
70 | } else { | |
86062033 WC |
71 | p = to_pedit(a); |
72 | tcf_hash_release(a, bind); | |
1a29321e JHS |
73 | if (bind) |
74 | return 0; | |
75 | if (!ovr) | |
1da177e4 | 76 | return -EEXIST; |
1a29321e | 77 | |
e9ce1cd3 | 78 | if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { |
1da177e4 LT |
79 | keys = kmalloc(ksize, GFP_KERNEL); |
80 | if (keys == NULL) | |
81 | return -ENOMEM; | |
82 | } | |
83 | } | |
84 | ||
e9ce1cd3 DM |
85 | spin_lock_bh(&p->tcf_lock); |
86 | p->tcfp_flags = parm->flags; | |
87 | p->tcf_action = parm->action; | |
1da177e4 | 88 | if (keys) { |
e9ce1cd3 DM |
89 | kfree(p->tcfp_keys); |
90 | p->tcfp_keys = keys; | |
91 | p->tcfp_nkeys = parm->nkeys; | |
1da177e4 | 92 | } |
e9ce1cd3 DM |
93 | memcpy(p->tcfp_keys, parm->keys, ksize); |
94 | spin_unlock_bh(&p->tcf_lock); | |
1da177e4 | 95 | if (ret == ACT_P_CREATED) |
86062033 | 96 | tcf_hash_insert(a); |
1da177e4 LT |
97 | return ret; |
98 | } | |
99 | ||
a5b5c958 | 100 | static void tcf_pedit_cleanup(struct tc_action *a, int bind) |
1da177e4 | 101 | { |
e9ce1cd3 | 102 | struct tcf_pedit *p = a->priv; |
a5b5c958 WC |
103 | struct tc_pedit_key *keys = p->tcfp_keys; |
104 | kfree(keys); | |
1da177e4 LT |
105 | } |
106 | ||
dc7f9f6e | 107 | static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 108 | struct tcf_result *res) |
1da177e4 | 109 | { |
e9ce1cd3 | 110 | struct tcf_pedit *p = a->priv; |
1da177e4 | 111 | int i, munged = 0; |
db2c2417 | 112 | unsigned int off; |
1da177e4 | 113 | |
14bbd6a5 | 114 | if (skb_unclone(skb, GFP_ATOMIC)) |
cc7ec456 | 115 | return p->tcf_action; |
1da177e4 | 116 | |
db2c2417 | 117 | off = skb_network_offset(skb); |
1da177e4 | 118 | |
e9ce1cd3 | 119 | spin_lock(&p->tcf_lock); |
1da177e4 | 120 | |
e9ce1cd3 | 121 | p->tcf_tm.lastuse = jiffies; |
1da177e4 | 122 | |
e9ce1cd3 DM |
123 | if (p->tcfp_nkeys > 0) { |
124 | struct tc_pedit_key *tkey = p->tcfp_keys; | |
1da177e4 | 125 | |
e9ce1cd3 | 126 | for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
db2c2417 | 127 | u32 *ptr, _data; |
1da177e4 LT |
128 | int offset = tkey->off; |
129 | ||
130 | if (tkey->offmask) { | |
db2c2417 CG |
131 | char *d, _d; |
132 | ||
133 | d = skb_header_pointer(skb, off + tkey->at, 1, | |
134 | &_d); | |
135 | if (!d) | |
1da177e4 | 136 | goto bad; |
db2c2417 | 137 | offset += (*d & tkey->offmask) >> tkey->shift; |
1da177e4 LT |
138 | } |
139 | ||
140 | if (offset % 4) { | |
6ff9c364 | 141 | pr_info("tc filter pedit" |
142 | " offset must be on 32 bit boundaries\n"); | |
1da177e4 LT |
143 | goto bad; |
144 | } | |
75202e76 | 145 | if (offset > 0 && offset > skb->len) { |
6ff9c364 | 146 | pr_info("tc filter pedit" |
25985edc | 147 | " offset %d can't exceed pkt length %d\n", |
1da177e4 LT |
148 | offset, skb->len); |
149 | goto bad; | |
150 | } | |
151 | ||
db2c2417 CG |
152 | ptr = skb_header_pointer(skb, off + offset, 4, &_data); |
153 | if (!ptr) | |
154 | goto bad; | |
1da177e4 LT |
155 | /* just do it, baby */ |
156 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); | |
db2c2417 CG |
157 | if (ptr == &_data) |
158 | skb_store_bits(skb, off + offset, ptr, 4); | |
1da177e4 LT |
159 | munged++; |
160 | } | |
10297b99 | 161 | |
1da177e4 LT |
162 | if (munged) |
163 | skb->tc_verd = SET_TC_MUNGED(skb->tc_verd); | |
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 | ||
e9ce1cd3 | 217 | static struct tc_action_ops act_pedit_ops = { |
1da177e4 LT |
218 | .kind = "pedit", |
219 | .type = TCA_ACT_PEDIT, | |
1da177e4 LT |
220 | .owner = THIS_MODULE, |
221 | .act = tcf_pedit, | |
222 | .dump = tcf_pedit_dump, | |
223 | .cleanup = tcf_pedit_cleanup, | |
1da177e4 | 224 | .init = tcf_pedit_init, |
1da177e4 LT |
225 | }; |
226 | ||
227 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
228 | MODULE_DESCRIPTION("Generic Packet Editor actions"); | |
229 | MODULE_LICENSE("GPL"); | |
230 | ||
e9ce1cd3 | 231 | static int __init pedit_init_module(void) |
1da177e4 | 232 | { |
4f1e9d89 | 233 | return tcf_register_action(&act_pedit_ops, PEDIT_TAB_MASK); |
1da177e4 LT |
234 | } |
235 | ||
e9ce1cd3 | 236 | static void __exit pedit_cleanup_module(void) |
1da177e4 LT |
237 | { |
238 | tcf_unregister_action(&act_pedit_ops); | |
239 | } | |
240 | ||
241 | module_init(pedit_init_module); | |
242 | module_exit(pedit_cleanup_module); | |
243 |