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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 | |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/string.h> |
15 | #include <linux/errno.h> |
16 | #include <linux/skbuff.h> |
17 | #include <linux/rtnetlink.h> |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> |
20 | #include <linux/slab.h> |
21 | #include <net/netlink.h> |
22 | #include <net/pkt_sched.h> |
23 | #include <linux/tc_act/tc_pedit.h> |
24 | #include <net/tc_act/tc_pedit.h> |
25 | |
26 | #define PEDIT_TAB_MASK 15 |
27 | static struct tcf_common *tcf_pedit_ht[PEDIT_TAB_MASK + 1]; |
28 | static u32 pedit_idx_gen; |
29 | static DEFINE_RWLOCK(pedit_lock); |
30 | |
31 | static struct tcf_hashinfo pedit_hash_info = { |
32 | .htab = tcf_pedit_ht, |
33 | .hmask = PEDIT_TAB_MASK, |
34 | .lock = &pedit_lock, |
35 | }; |
36 | |
37 | static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { |
38 | [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) }, |
39 | }; |
40 | |
41 | static int tcf_pedit_init(struct nlattr *nla, struct nlattr *est, |
42 | struct tc_action *a, int ovr, int bind) |
43 | { |
44 | struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
45 | struct tc_pedit *parm; |
46 | int ret = 0, err; |
47 | struct tcf_pedit *p; |
48 | struct tcf_common *pc; |
49 | struct tc_pedit_key *keys = NULL; |
50 | int ksize; |
51 | |
52 | if (nla == NULL) |
53 | return -EINVAL; |
54 | |
55 | err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy); |
56 | if (err < 0) |
57 | return err; |
58 | |
59 | if (tb[TCA_PEDIT_PARMS] == NULL) |
60 | return -EINVAL; |
61 | parm = nla_data(tb[TCA_PEDIT_PARMS]); |
62 | ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
63 | if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize) |
64 | return -EINVAL; |
65 | |
66 | pc = tcf_hash_check(parm->index, a, bind, &pedit_hash_info); |
67 | if (!pc) { |
68 | if (!parm->nkeys) |
69 | return -EINVAL; |
70 | pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind, |
71 | &pedit_idx_gen, &pedit_hash_info); |
72 | if (IS_ERR(pc)) |
73 | return PTR_ERR(pc); |
74 | p = to_pedit(pc); |
75 | keys = kmalloc(ksize, GFP_KERNEL); |
76 | if (keys == NULL) { |
77 | kfree(pc); |
78 | return -ENOMEM; |
79 | } |
80 | ret = ACT_P_CREATED; |
81 | } else { |
82 | p = to_pedit(pc); |
83 | if (!ovr) { |
84 | tcf_hash_release(pc, bind, &pedit_hash_info); |
85 | return -EEXIST; |
86 | } |
87 | if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) { |
88 | keys = kmalloc(ksize, GFP_KERNEL); |
89 | if (keys == NULL) |
90 | return -ENOMEM; |
91 | } |
92 | } |
93 | |
94 | spin_lock_bh(&p->tcf_lock); |
95 | p->tcfp_flags = parm->flags; |
96 | p->tcf_action = parm->action; |
97 | if (keys) { |
98 | kfree(p->tcfp_keys); |
99 | p->tcfp_keys = keys; |
100 | p->tcfp_nkeys = parm->nkeys; |
101 | } |
102 | memcpy(p->tcfp_keys, parm->keys, ksize); |
103 | spin_unlock_bh(&p->tcf_lock); |
104 | if (ret == ACT_P_CREATED) |
105 | tcf_hash_insert(pc, &pedit_hash_info); |
106 | return ret; |
107 | } |
108 | |
109 | static int tcf_pedit_cleanup(struct tc_action *a, int bind) |
110 | { |
111 | struct tcf_pedit *p = a->priv; |
112 | |
113 | if (p) { |
114 | struct tc_pedit_key *keys = p->tcfp_keys; |
115 | if (tcf_hash_release(&p->common, bind, &pedit_hash_info)) { |
116 | kfree(keys); |
117 | return 1; |
118 | } |
119 | } |
120 | return 0; |
121 | } |
122 | |
123 | static int tcf_pedit(struct sk_buff *skb, struct tc_action *a, |
124 | struct tcf_result *res) |
125 | { |
126 | struct tcf_pedit *p = a->priv; |
127 | int i, munged = 0; |
128 | u8 *pptr; |
129 | |
130 | if (!(skb->tc_verd & TC_OK2MUNGE)) { |
131 | /* should we set skb->cloned? */ |
132 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { |
133 | return p->tcf_action; |
134 | } |
135 | } |
136 | |
137 | pptr = skb_network_header(skb); |
138 | |
139 | spin_lock(&p->tcf_lock); |
140 | |
141 | p->tcf_tm.lastuse = jiffies; |
142 | |
143 | if (p->tcfp_nkeys > 0) { |
144 | struct tc_pedit_key *tkey = p->tcfp_keys; |
145 | |
146 | for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
147 | u32 *ptr; |
148 | int offset = tkey->off; |
149 | |
150 | if (tkey->offmask) { |
151 | if (skb->len > tkey->at) { |
152 | char *j = pptr + tkey->at; |
153 | offset += ((*j & tkey->offmask) >> |
154 | tkey->shift); |
155 | } else { |
156 | goto bad; |
157 | } |
158 | } |
159 | |
160 | if (offset % 4) { |
161 | printk("offset must be on 32 bit boundaries\n"); |
162 | goto bad; |
163 | } |
164 | if (offset > 0 && offset > skb->len) { |
165 | printk("offset %d cant exceed pkt length %d\n", |
166 | offset, skb->len); |
167 | goto bad; |
168 | } |
169 | |
170 | ptr = (u32 *)(pptr+offset); |
171 | /* just do it, baby */ |
172 | *ptr = ((*ptr & tkey->mask) ^ tkey->val); |
173 | munged++; |
174 | } |
175 | |
176 | if (munged) |
177 | skb->tc_verd = SET_TC_MUNGED(skb->tc_verd); |
178 | goto done; |
179 | } else { |
180 | printk("pedit BUG: index %d\n", p->tcf_index); |
181 | } |
182 | |
183 | bad: |
184 | p->tcf_qstats.overlimits++; |
185 | done: |
186 | p->tcf_bstats.bytes += qdisc_pkt_len(skb); |
187 | p->tcf_bstats.packets++; |
188 | spin_unlock(&p->tcf_lock); |
189 | return p->tcf_action; |
190 | } |
191 | |
192 | static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, |
193 | int bind, int ref) |
194 | { |
195 | unsigned char *b = skb_tail_pointer(skb); |
196 | struct tcf_pedit *p = a->priv; |
197 | struct tc_pedit *opt; |
198 | struct tcf_t t; |
199 | int s; |
200 | |
201 | s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key); |
202 | |
203 | /* netlink spinlocks held above us - must use ATOMIC */ |
204 | opt = kzalloc(s, GFP_ATOMIC); |
205 | if (unlikely(!opt)) |
206 | return -ENOBUFS; |
207 | |
208 | memcpy(opt->keys, p->tcfp_keys, |
209 | p->tcfp_nkeys * sizeof(struct tc_pedit_key)); |
210 | opt->index = p->tcf_index; |
211 | opt->nkeys = p->tcfp_nkeys; |
212 | opt->flags = p->tcfp_flags; |
213 | opt->action = p->tcf_action; |
214 | opt->refcnt = p->tcf_refcnt - ref; |
215 | opt->bindcnt = p->tcf_bindcnt - bind; |
216 | |
217 | NLA_PUT(skb, TCA_PEDIT_PARMS, s, opt); |
218 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); |
219 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); |
220 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); |
221 | NLA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t); |
222 | kfree(opt); |
223 | return skb->len; |
224 | |
225 | nla_put_failure: |
226 | nlmsg_trim(skb, b); |
227 | kfree(opt); |
228 | return -1; |
229 | } |
230 | |
231 | static struct tc_action_ops act_pedit_ops = { |
232 | .kind = "pedit", |
233 | .hinfo = &pedit_hash_info, |
234 | .type = TCA_ACT_PEDIT, |
235 | .capab = TCA_CAP_NONE, |
236 | .owner = THIS_MODULE, |
237 | .act = tcf_pedit, |
238 | .dump = tcf_pedit_dump, |
239 | .cleanup = tcf_pedit_cleanup, |
240 | .lookup = tcf_hash_search, |
241 | .init = tcf_pedit_init, |
242 | .walk = tcf_generic_walker |
243 | }; |
244 | |
245 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); |
246 | MODULE_DESCRIPTION("Generic Packet Editor actions"); |
247 | MODULE_LICENSE("GPL"); |
248 | |
249 | static int __init pedit_init_module(void) |
250 | { |
251 | return tcf_register_action(&act_pedit_ops); |
252 | } |
253 | |
254 | static void __exit pedit_cleanup_module(void) |
255 | { |
256 | tcf_unregister_action(&act_pedit_ops); |
257 | } |
258 | |
259 | module_init(pedit_init_module); |
260 | module_exit(pedit_cleanup_module); |
261 | |
262 |
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