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> | |
dc5fc579 | 20 | #include <net/netlink.h> |
1da177e4 LT |
21 | #include <net/pkt_sched.h> |
22 | #include <linux/tc_act/tc_pedit.h> | |
23 | #include <net/tc_act/tc_pedit.h> | |
24 | ||
e9ce1cd3 DM |
25 | #define PEDIT_TAB_MASK 15 |
26 | static struct tcf_common *tcf_pedit_ht[PEDIT_TAB_MASK + 1]; | |
27 | static u32 pedit_idx_gen; | |
1da177e4 LT |
28 | static DEFINE_RWLOCK(pedit_lock); |
29 | ||
e9ce1cd3 DM |
30 | static struct tcf_hashinfo pedit_hash_info = { |
31 | .htab = tcf_pedit_ht, | |
32 | .hmask = PEDIT_TAB_MASK, | |
33 | .lock = &pedit_lock, | |
34 | }; | |
1da177e4 | 35 | |
53b2bf3f PM |
36 | static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { |
37 | [TCA_PEDIT_PARMS] = { .len = sizeof(struct tcf_pedit) }, | |
38 | }; | |
39 | ||
7ba699c6 | 40 | static int tcf_pedit_init(struct nlattr *nla, struct nlattr *est, |
e9ce1cd3 | 41 | struct tc_action *a, int ovr, int bind) |
1da177e4 | 42 | { |
7ba699c6 | 43 | struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
1da177e4 | 44 | struct tc_pedit *parm; |
cee63723 | 45 | int ret = 0, err; |
1da177e4 | 46 | struct tcf_pedit *p; |
e9ce1cd3 | 47 | struct tcf_common *pc; |
1da177e4 LT |
48 | struct tc_pedit_key *keys = NULL; |
49 | int ksize; | |
50 | ||
cee63723 | 51 | if (nla == NULL) |
1da177e4 LT |
52 | return -EINVAL; |
53 | ||
53b2bf3f | 54 | err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); |
cee63723 PM |
55 | if (err < 0) |
56 | return err; | |
57 | ||
53b2bf3f | 58 | if (tb[TCA_PEDIT_PARMS] == NULL) |
1da177e4 | 59 | return -EINVAL; |
7ba699c6 | 60 | parm = nla_data(tb[TCA_PEDIT_PARMS]); |
1da177e4 | 61 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
7ba699c6 | 62 | if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) |
1da177e4 LT |
63 | return -EINVAL; |
64 | ||
e9ce1cd3 DM |
65 | pc = tcf_hash_check(parm->index, a, bind, &pedit_hash_info); |
66 | if (!pc) { | |
1da177e4 LT |
67 | if (!parm->nkeys) |
68 | return -EINVAL; | |
e9ce1cd3 DM |
69 | pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind, |
70 | &pedit_idx_gen, &pedit_hash_info); | |
0e991ec6 SH |
71 | if (IS_ERR(pc)) |
72 | return PTR_ERR(pc); | |
e9ce1cd3 | 73 | p = to_pedit(pc); |
1da177e4 LT |
74 | keys = kmalloc(ksize, GFP_KERNEL); |
75 | if (keys == NULL) { | |
e9ce1cd3 | 76 | kfree(pc); |
1da177e4 LT |
77 | return -ENOMEM; |
78 | } | |
79 | ret = ACT_P_CREATED; | |
80 | } else { | |
e9ce1cd3 | 81 | p = to_pedit(pc); |
1da177e4 | 82 | if (!ovr) { |
e9ce1cd3 | 83 | tcf_hash_release(pc, bind, &pedit_hash_info); |
1da177e4 LT |
84 | return -EEXIST; |
85 | } | |
e9ce1cd3 | 86 | if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { |
1da177e4 LT |
87 | keys = kmalloc(ksize, GFP_KERNEL); |
88 | if (keys == NULL) | |
89 | return -ENOMEM; | |
90 | } | |
91 | } | |
92 | ||
e9ce1cd3 DM |
93 | spin_lock_bh(&p->tcf_lock); |
94 | p->tcfp_flags = parm->flags; | |
95 | p->tcf_action = parm->action; | |
1da177e4 | 96 | if (keys) { |
e9ce1cd3 DM |
97 | kfree(p->tcfp_keys); |
98 | p->tcfp_keys = keys; | |
99 | p->tcfp_nkeys = parm->nkeys; | |
1da177e4 | 100 | } |
e9ce1cd3 DM |
101 | memcpy(p->tcfp_keys, parm->keys, ksize); |
102 | spin_unlock_bh(&p->tcf_lock); | |
1da177e4 | 103 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 104 | tcf_hash_insert(pc, &pedit_hash_info); |
1da177e4 LT |
105 | return ret; |
106 | } | |
107 | ||
e9ce1cd3 | 108 | static int tcf_pedit_cleanup(struct tc_action *a, int bind) |
1da177e4 | 109 | { |
e9ce1cd3 | 110 | struct tcf_pedit *p = a->priv; |
1da177e4 | 111 | |
e9ce1cd3 DM |
112 | if (p) { |
113 | struct tc_pedit_key *keys = p->tcfp_keys; | |
114 | if (tcf_hash_release(&p->common, bind, &pedit_hash_info)) { | |
1da177e4 LT |
115 | kfree(keys); |
116 | return 1; | |
117 | } | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
e9ce1cd3 DM |
122 | static int tcf_pedit(struct sk_buff *skb, struct tc_action *a, |
123 | struct tcf_result *res) | |
1da177e4 | 124 | { |
e9ce1cd3 | 125 | struct tcf_pedit *p = a->priv; |
1da177e4 LT |
126 | int i, munged = 0; |
127 | u8 *pptr; | |
128 | ||
129 | if (!(skb->tc_verd & TC_OK2MUNGE)) { | |
130 | /* should we set skb->cloned? */ | |
131 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { | |
e9ce1cd3 | 132 | return p->tcf_action; |
1da177e4 LT |
133 | } |
134 | } | |
135 | ||
d56f90a7 | 136 | pptr = skb_network_header(skb); |
1da177e4 | 137 | |
e9ce1cd3 | 138 | spin_lock(&p->tcf_lock); |
1da177e4 | 139 | |
e9ce1cd3 | 140 | p->tcf_tm.lastuse = jiffies; |
1da177e4 | 141 | |
e9ce1cd3 DM |
142 | if (p->tcfp_nkeys > 0) { |
143 | struct tc_pedit_key *tkey = p->tcfp_keys; | |
1da177e4 | 144 | |
e9ce1cd3 | 145 | for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
1da177e4 LT |
146 | u32 *ptr; |
147 | int offset = tkey->off; | |
148 | ||
149 | if (tkey->offmask) { | |
150 | if (skb->len > tkey->at) { | |
151 | char *j = pptr + tkey->at; | |
10297b99 YH |
152 | offset += ((*j & tkey->offmask) >> |
153 | tkey->shift); | |
1da177e4 LT |
154 | } else { |
155 | goto bad; | |
156 | } | |
157 | } | |
158 | ||
159 | if (offset % 4) { | |
160 | printk("offset must be on 32 bit boundaries\n"); | |
161 | goto bad; | |
162 | } | |
75202e76 | 163 | if (offset > 0 && offset > skb->len) { |
1da177e4 LT |
164 | printk("offset %d cant exceed pkt length %d\n", |
165 | offset, skb->len); | |
166 | goto bad; | |
167 | } | |
168 | ||
169 | ptr = (u32 *)(pptr+offset); | |
170 | /* just do it, baby */ | |
171 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); | |
172 | munged++; | |
173 | } | |
10297b99 | 174 | |
1da177e4 LT |
175 | if (munged) |
176 | skb->tc_verd = SET_TC_MUNGED(skb->tc_verd); | |
177 | goto done; | |
178 | } else { | |
e9ce1cd3 | 179 | printk("pedit BUG: index %d\n", p->tcf_index); |
1da177e4 LT |
180 | } |
181 | ||
182 | bad: | |
e9ce1cd3 | 183 | p->tcf_qstats.overlimits++; |
1da177e4 | 184 | done: |
0abf77e5 | 185 | p->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 DM |
186 | p->tcf_bstats.packets++; |
187 | spin_unlock(&p->tcf_lock); | |
188 | return p->tcf_action; | |
1da177e4 LT |
189 | } |
190 | ||
e9ce1cd3 DM |
191 | static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, |
192 | int bind, int ref) | |
1da177e4 | 193 | { |
27a884dc | 194 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 195 | struct tcf_pedit *p = a->priv; |
1da177e4 | 196 | struct tc_pedit *opt; |
1da177e4 | 197 | struct tcf_t t; |
10297b99 YH |
198 | int s; |
199 | ||
e9ce1cd3 | 200 | s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key); |
1da177e4 LT |
201 | |
202 | /* netlink spinlocks held above us - must use ATOMIC */ | |
0da974f4 | 203 | opt = kzalloc(s, GFP_ATOMIC); |
e9ce1cd3 | 204 | if (unlikely(!opt)) |
1da177e4 | 205 | return -ENOBUFS; |
1da177e4 | 206 | |
e9ce1cd3 DM |
207 | memcpy(opt->keys, p->tcfp_keys, |
208 | p->tcfp_nkeys * sizeof(struct tc_pedit_key)); | |
209 | opt->index = p->tcf_index; | |
210 | opt->nkeys = p->tcfp_nkeys; | |
211 | opt->flags = p->tcfp_flags; | |
212 | opt->action = p->tcf_action; | |
213 | opt->refcnt = p->tcf_refcnt - ref; | |
214 | opt->bindcnt = p->tcf_bindcnt - bind; | |
1da177e4 | 215 | |
7ba699c6 | 216 | NLA_PUT(skb, TCA_PEDIT_PARMS, s, opt); |
e9ce1cd3 DM |
217 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); |
218 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); | |
219 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); | |
7ba699c6 | 220 | NLA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t); |
541673c8 | 221 | kfree(opt); |
1da177e4 LT |
222 | return skb->len; |
223 | ||
7ba699c6 | 224 | nla_put_failure: |
dc5fc579 | 225 | nlmsg_trim(skb, b); |
541673c8 | 226 | kfree(opt); |
1da177e4 LT |
227 | return -1; |
228 | } | |
229 | ||
e9ce1cd3 | 230 | static struct tc_action_ops act_pedit_ops = { |
1da177e4 | 231 | .kind = "pedit", |
e9ce1cd3 | 232 | .hinfo = &pedit_hash_info, |
1da177e4 LT |
233 | .type = TCA_ACT_PEDIT, |
234 | .capab = TCA_CAP_NONE, | |
235 | .owner = THIS_MODULE, | |
236 | .act = tcf_pedit, | |
237 | .dump = tcf_pedit_dump, | |
238 | .cleanup = tcf_pedit_cleanup, | |
239 | .lookup = tcf_hash_search, | |
240 | .init = tcf_pedit_init, | |
241 | .walk = tcf_generic_walker | |
242 | }; | |
243 | ||
244 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
245 | MODULE_DESCRIPTION("Generic Packet Editor actions"); | |
246 | MODULE_LICENSE("GPL"); | |
247 | ||
e9ce1cd3 | 248 | static int __init pedit_init_module(void) |
1da177e4 LT |
249 | { |
250 | return tcf_register_action(&act_pedit_ops); | |
251 | } | |
252 | ||
e9ce1cd3 | 253 | static void __exit pedit_cleanup_module(void) |
1da177e4 LT |
254 | { |
255 | tcf_unregister_action(&act_pedit_ops); | |
256 | } | |
257 | ||
258 | module_init(pedit_init_module); | |
259 | module_exit(pedit_cleanup_module); | |
260 |