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