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Commit | Line | Data |
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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 | ||
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 | |
369ba567 | 28 | static struct tcf_hashinfo pedit_hash_info; |
1da177e4 | 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 | { |
7ba699c6 | 38 | struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
1da177e4 | 39 | struct tc_pedit *parm; |
cee63723 | 40 | int ret = 0, err; |
1da177e4 LT |
41 | struct tcf_pedit *p; |
42 | struct tc_pedit_key *keys = NULL; | |
43 | int ksize; | |
44 | ||
cee63723 | 45 | if (nla == NULL) |
1da177e4 LT |
46 | return -EINVAL; |
47 | ||
53b2bf3f | 48 | err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); |
cee63723 PM |
49 | if (err < 0) |
50 | return err; | |
51 | ||
53b2bf3f | 52 | if (tb[TCA_PEDIT_PARMS] == NULL) |
1da177e4 | 53 | return -EINVAL; |
7ba699c6 | 54 | parm = nla_data(tb[TCA_PEDIT_PARMS]); |
1da177e4 | 55 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
7ba699c6 | 56 | if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) |
1da177e4 LT |
57 | return -EINVAL; |
58 | ||
86062033 | 59 | if (!tcf_hash_check(parm->index, a, bind)) { |
1da177e4 LT |
60 | if (!parm->nkeys) |
61 | return -EINVAL; | |
86062033 WC |
62 | ret = tcf_hash_create(parm->index, est, a, sizeof(*p), bind); |
63 | if (ret) | |
64 | return ret; | |
65 | p = to_pedit(a); | |
1da177e4 LT |
66 | keys = kmalloc(ksize, GFP_KERNEL); |
67 | if (keys == NULL) { | |
86062033 | 68 | tcf_hash_cleanup(a, est); |
1da177e4 LT |
69 | return -ENOMEM; |
70 | } | |
71 | ret = ACT_P_CREATED; | |
72 | } else { | |
86062033 WC |
73 | p = to_pedit(a); |
74 | tcf_hash_release(a, bind); | |
1a29321e JHS |
75 | if (bind) |
76 | return 0; | |
77 | if (!ovr) | |
1da177e4 | 78 | return -EEXIST; |
1a29321e | 79 | |
e9ce1cd3 | 80 | if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { |
1da177e4 LT |
81 | keys = kmalloc(ksize, GFP_KERNEL); |
82 | if (keys == NULL) | |
83 | return -ENOMEM; | |
84 | } | |
85 | } | |
86 | ||
e9ce1cd3 DM |
87 | spin_lock_bh(&p->tcf_lock); |
88 | p->tcfp_flags = parm->flags; | |
89 | p->tcf_action = parm->action; | |
1da177e4 | 90 | if (keys) { |
e9ce1cd3 DM |
91 | kfree(p->tcfp_keys); |
92 | p->tcfp_keys = keys; | |
93 | p->tcfp_nkeys = parm->nkeys; | |
1da177e4 | 94 | } |
e9ce1cd3 DM |
95 | memcpy(p->tcfp_keys, parm->keys, ksize); |
96 | spin_unlock_bh(&p->tcf_lock); | |
1da177e4 | 97 | if (ret == ACT_P_CREATED) |
86062033 | 98 | tcf_hash_insert(a); |
1da177e4 LT |
99 | return ret; |
100 | } | |
101 | ||
e9ce1cd3 | 102 | static int tcf_pedit_cleanup(struct tc_action *a, int bind) |
1da177e4 | 103 | { |
e9ce1cd3 | 104 | struct tcf_pedit *p = a->priv; |
1da177e4 | 105 | |
e9ce1cd3 DM |
106 | if (p) { |
107 | struct tc_pedit_key *keys = p->tcfp_keys; | |
86062033 | 108 | if (tcf_hash_release(a, bind)) { |
1da177e4 LT |
109 | kfree(keys); |
110 | return 1; | |
111 | } | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
dc7f9f6e | 116 | static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 117 | struct tcf_result *res) |
1da177e4 | 118 | { |
e9ce1cd3 | 119 | struct tcf_pedit *p = a->priv; |
1da177e4 | 120 | int i, munged = 0; |
db2c2417 | 121 | unsigned int off; |
1da177e4 | 122 | |
14bbd6a5 | 123 | if (skb_unclone(skb, GFP_ATOMIC)) |
cc7ec456 | 124 | return p->tcf_action; |
1da177e4 | 125 | |
db2c2417 | 126 | off = skb_network_offset(skb); |
1da177e4 | 127 | |
e9ce1cd3 | 128 | spin_lock(&p->tcf_lock); |
1da177e4 | 129 | |
e9ce1cd3 | 130 | p->tcf_tm.lastuse = jiffies; |
1da177e4 | 131 | |
e9ce1cd3 DM |
132 | if (p->tcfp_nkeys > 0) { |
133 | struct tc_pedit_key *tkey = p->tcfp_keys; | |
1da177e4 | 134 | |
e9ce1cd3 | 135 | for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
db2c2417 | 136 | u32 *ptr, _data; |
1da177e4 LT |
137 | int offset = tkey->off; |
138 | ||
139 | if (tkey->offmask) { | |
db2c2417 CG |
140 | char *d, _d; |
141 | ||
142 | d = skb_header_pointer(skb, off + tkey->at, 1, | |
143 | &_d); | |
144 | if (!d) | |
1da177e4 | 145 | goto bad; |
db2c2417 | 146 | offset += (*d & tkey->offmask) >> tkey->shift; |
1da177e4 LT |
147 | } |
148 | ||
149 | if (offset % 4) { | |
6ff9c364 | 150 | pr_info("tc filter pedit" |
151 | " offset must be on 32 bit boundaries\n"); | |
1da177e4 LT |
152 | goto bad; |
153 | } | |
75202e76 | 154 | if (offset > 0 && offset > skb->len) { |
6ff9c364 | 155 | pr_info("tc filter pedit" |
25985edc | 156 | " offset %d can't exceed pkt length %d\n", |
1da177e4 LT |
157 | offset, skb->len); |
158 | goto bad; | |
159 | } | |
160 | ||
db2c2417 CG |
161 | ptr = skb_header_pointer(skb, off + offset, 4, &_data); |
162 | if (!ptr) | |
163 | goto bad; | |
1da177e4 LT |
164 | /* just do it, baby */ |
165 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); | |
db2c2417 CG |
166 | if (ptr == &_data) |
167 | skb_store_bits(skb, off + offset, ptr, 4); | |
1da177e4 LT |
168 | munged++; |
169 | } | |
10297b99 | 170 | |
1da177e4 LT |
171 | if (munged) |
172 | skb->tc_verd = SET_TC_MUNGED(skb->tc_verd); | |
173 | goto done; | |
6ff9c364 | 174 | } else |
175 | WARN(1, "pedit BUG: index %d\n", p->tcf_index); | |
1da177e4 LT |
176 | |
177 | bad: | |
e9ce1cd3 | 178 | p->tcf_qstats.overlimits++; |
1da177e4 | 179 | done: |
bfe0d029 | 180 | bstats_update(&p->tcf_bstats, skb); |
e9ce1cd3 DM |
181 | spin_unlock(&p->tcf_lock); |
182 | return p->tcf_action; | |
1da177e4 LT |
183 | } |
184 | ||
e9ce1cd3 DM |
185 | static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, |
186 | int bind, int ref) | |
1da177e4 | 187 | { |
27a884dc | 188 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 189 | struct tcf_pedit *p = a->priv; |
1da177e4 | 190 | struct tc_pedit *opt; |
1da177e4 | 191 | struct tcf_t t; |
10297b99 YH |
192 | int s; |
193 | ||
e9ce1cd3 | 194 | s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key); |
1da177e4 LT |
195 | |
196 | /* netlink spinlocks held above us - must use ATOMIC */ | |
0da974f4 | 197 | opt = kzalloc(s, GFP_ATOMIC); |
e9ce1cd3 | 198 | if (unlikely(!opt)) |
1da177e4 | 199 | return -ENOBUFS; |
1da177e4 | 200 | |
e9ce1cd3 DM |
201 | memcpy(opt->keys, p->tcfp_keys, |
202 | p->tcfp_nkeys * sizeof(struct tc_pedit_key)); | |
203 | opt->index = p->tcf_index; | |
204 | opt->nkeys = p->tcfp_nkeys; | |
205 | opt->flags = p->tcfp_flags; | |
206 | opt->action = p->tcf_action; | |
207 | opt->refcnt = p->tcf_refcnt - ref; | |
208 | opt->bindcnt = p->tcf_bindcnt - bind; | |
1da177e4 | 209 | |
1b34ec43 DM |
210 | if (nla_put(skb, TCA_PEDIT_PARMS, s, opt)) |
211 | goto nla_put_failure; | |
e9ce1cd3 DM |
212 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); |
213 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); | |
214 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); | |
1b34ec43 DM |
215 | if (nla_put(skb, TCA_PEDIT_TM, sizeof(t), &t)) |
216 | goto nla_put_failure; | |
541673c8 | 217 | kfree(opt); |
1da177e4 LT |
218 | return skb->len; |
219 | ||
7ba699c6 | 220 | nla_put_failure: |
dc5fc579 | 221 | nlmsg_trim(skb, b); |
541673c8 | 222 | kfree(opt); |
1da177e4 LT |
223 | return -1; |
224 | } | |
225 | ||
e9ce1cd3 | 226 | static struct tc_action_ops act_pedit_ops = { |
1da177e4 | 227 | .kind = "pedit", |
e9ce1cd3 | 228 | .hinfo = &pedit_hash_info, |
1da177e4 | 229 | .type = TCA_ACT_PEDIT, |
1da177e4 LT |
230 | .owner = THIS_MODULE, |
231 | .act = tcf_pedit, | |
232 | .dump = tcf_pedit_dump, | |
233 | .cleanup = tcf_pedit_cleanup, | |
1da177e4 | 234 | .init = tcf_pedit_init, |
1da177e4 LT |
235 | }; |
236 | ||
237 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
238 | MODULE_DESCRIPTION("Generic Packet Editor actions"); | |
239 | MODULE_LICENSE("GPL"); | |
240 | ||
e9ce1cd3 | 241 | static int __init pedit_init_module(void) |
1da177e4 | 242 | { |
568a153a | 243 | int err = tcf_hashinfo_init(&pedit_hash_info, PEDIT_TAB_MASK); |
369ba567 WC |
244 | if (err) |
245 | return err; | |
1da177e4 LT |
246 | return tcf_register_action(&act_pedit_ops); |
247 | } | |
248 | ||
e9ce1cd3 | 249 | static void __exit pedit_cleanup_module(void) |
1da177e4 | 250 | { |
369ba567 | 251 | tcf_hashinfo_destroy(&pedit_hash_info); |
1da177e4 LT |
252 | tcf_unregister_action(&act_pedit_ops); |
253 | } | |
254 | ||
255 | module_init(pedit_init_module); | |
256 | module_exit(pedit_cleanup_module); | |
257 |