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ca9b0e27 AD |
1 | /* |
2 | * Copyright (c) 2008, Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Author: Alexander Duyck <alexander.h.duyck@intel.com> | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/netlink.h> | |
26 | #include <net/pkt_sched.h> | |
27 | ||
28 | #include <linux/tc_act/tc_skbedit.h> | |
29 | #include <net/tc_act/tc_skbedit.h> | |
30 | ||
31 | #define SKBEDIT_TAB_MASK 15 | |
32 | static struct tcf_common *tcf_skbedit_ht[SKBEDIT_TAB_MASK + 1]; | |
33 | static u32 skbedit_idx_gen; | |
34 | static DEFINE_RWLOCK(skbedit_lock); | |
35 | ||
36 | static struct tcf_hashinfo skbedit_hash_info = { | |
37 | .htab = tcf_skbedit_ht, | |
38 | .hmask = SKBEDIT_TAB_MASK, | |
39 | .lock = &skbedit_lock, | |
40 | }; | |
41 | ||
dc7f9f6e | 42 | static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a, |
ca9b0e27 AD |
43 | struct tcf_result *res) |
44 | { | |
45 | struct tcf_skbedit *d = a->priv; | |
46 | ||
47 | spin_lock(&d->tcf_lock); | |
48 | d->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 49 | bstats_update(&d->tcf_bstats, skb); |
ca9b0e27 AD |
50 | |
51 | if (d->flags & SKBEDIT_F_PRIORITY) | |
52 | skb->priority = d->priority; | |
53 | if (d->flags & SKBEDIT_F_QUEUE_MAPPING && | |
54 | skb->dev->real_num_tx_queues > d->queue_mapping) | |
55 | skb_set_queue_mapping(skb, d->queue_mapping); | |
1c55d62e | 56 | if (d->flags & SKBEDIT_F_MARK) |
57 | skb->mark = d->mark; | |
ca9b0e27 AD |
58 | |
59 | spin_unlock(&d->tcf_lock); | |
60 | return d->tcf_action; | |
61 | } | |
62 | ||
63 | static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { | |
64 | [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, | |
65 | [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, | |
66 | [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, | |
1c55d62e | 67 | [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, |
ca9b0e27 AD |
68 | }; |
69 | ||
70 | static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est, | |
71 | struct tc_action *a, int ovr, int bind) | |
72 | { | |
73 | struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; | |
74 | struct tc_skbedit *parm; | |
75 | struct tcf_skbedit *d; | |
76 | struct tcf_common *pc; | |
1c55d62e | 77 | u32 flags = 0, *priority = NULL, *mark = NULL; |
ca9b0e27 AD |
78 | u16 *queue_mapping = NULL; |
79 | int ret = 0, err; | |
80 | ||
81 | if (nla == NULL) | |
82 | return -EINVAL; | |
83 | ||
84 | err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); | |
85 | if (err < 0) | |
86 | return err; | |
87 | ||
88 | if (tb[TCA_SKBEDIT_PARMS] == NULL) | |
89 | return -EINVAL; | |
90 | ||
91 | if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { | |
92 | flags |= SKBEDIT_F_PRIORITY; | |
93 | priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); | |
94 | } | |
95 | ||
96 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { | |
97 | flags |= SKBEDIT_F_QUEUE_MAPPING; | |
98 | queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); | |
99 | } | |
1c55d62e | 100 | |
101 | if (tb[TCA_SKBEDIT_MARK] != NULL) { | |
102 | flags |= SKBEDIT_F_MARK; | |
103 | mark = nla_data(tb[TCA_SKBEDIT_MARK]); | |
104 | } | |
105 | ||
ca9b0e27 AD |
106 | if (!flags) |
107 | return -EINVAL; | |
108 | ||
109 | parm = nla_data(tb[TCA_SKBEDIT_PARMS]); | |
110 | ||
111 | pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info); | |
112 | if (!pc) { | |
113 | pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, | |
114 | &skbedit_idx_gen, &skbedit_hash_info); | |
0e991ec6 | 115 | if (IS_ERR(pc)) |
cc7ec456 | 116 | return PTR_ERR(pc); |
ca9b0e27 AD |
117 | |
118 | d = to_skbedit(pc); | |
119 | ret = ACT_P_CREATED; | |
120 | } else { | |
121 | d = to_skbedit(pc); | |
122 | if (!ovr) { | |
123 | tcf_hash_release(pc, bind, &skbedit_hash_info); | |
124 | return -EEXIST; | |
125 | } | |
126 | } | |
127 | ||
128 | spin_lock_bh(&d->tcf_lock); | |
129 | ||
130 | d->flags = flags; | |
131 | if (flags & SKBEDIT_F_PRIORITY) | |
132 | d->priority = *priority; | |
133 | if (flags & SKBEDIT_F_QUEUE_MAPPING) | |
134 | d->queue_mapping = *queue_mapping; | |
1c55d62e | 135 | if (flags & SKBEDIT_F_MARK) |
136 | d->mark = *mark; | |
137 | ||
ca9b0e27 AD |
138 | d->tcf_action = parm->action; |
139 | ||
140 | spin_unlock_bh(&d->tcf_lock); | |
141 | ||
142 | if (ret == ACT_P_CREATED) | |
143 | tcf_hash_insert(pc, &skbedit_hash_info); | |
144 | return ret; | |
145 | } | |
146 | ||
cc7ec456 | 147 | static int tcf_skbedit_cleanup(struct tc_action *a, int bind) |
ca9b0e27 AD |
148 | { |
149 | struct tcf_skbedit *d = a->priv; | |
150 | ||
151 | if (d) | |
152 | return tcf_hash_release(&d->common, bind, &skbedit_hash_info); | |
153 | return 0; | |
154 | } | |
155 | ||
cc7ec456 ED |
156 | static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
157 | int bind, int ref) | |
ca9b0e27 AD |
158 | { |
159 | unsigned char *b = skb_tail_pointer(skb); | |
160 | struct tcf_skbedit *d = a->priv; | |
1c40be12 ED |
161 | struct tc_skbedit opt = { |
162 | .index = d->tcf_index, | |
163 | .refcnt = d->tcf_refcnt - ref, | |
164 | .bindcnt = d->tcf_bindcnt - bind, | |
165 | .action = d->tcf_action, | |
166 | }; | |
ca9b0e27 AD |
167 | struct tcf_t t; |
168 | ||
1b34ec43 DM |
169 | if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) |
170 | goto nla_put_failure; | |
171 | if ((d->flags & SKBEDIT_F_PRIORITY) && | |
172 | nla_put(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), | |
173 | &d->priority)) | |
174 | goto nla_put_failure; | |
175 | if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && | |
176 | nla_put(skb, TCA_SKBEDIT_QUEUE_MAPPING, | |
177 | sizeof(d->queue_mapping), &d->queue_mapping)) | |
178 | goto nla_put_failure; | |
179 | if ((d->flags & SKBEDIT_F_MARK) && | |
180 | nla_put(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), | |
181 | &d->mark)) | |
182 | goto nla_put_failure; | |
ca9b0e27 AD |
183 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
184 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
185 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
1b34ec43 DM |
186 | if (nla_put(skb, TCA_SKBEDIT_TM, sizeof(t), &t)) |
187 | goto nla_put_failure; | |
ca9b0e27 AD |
188 | return skb->len; |
189 | ||
190 | nla_put_failure: | |
191 | nlmsg_trim(skb, b); | |
192 | return -1; | |
193 | } | |
194 | ||
195 | static struct tc_action_ops act_skbedit_ops = { | |
196 | .kind = "skbedit", | |
197 | .hinfo = &skbedit_hash_info, | |
198 | .type = TCA_ACT_SKBEDIT, | |
199 | .capab = TCA_CAP_NONE, | |
200 | .owner = THIS_MODULE, | |
201 | .act = tcf_skbedit, | |
202 | .dump = tcf_skbedit_dump, | |
203 | .cleanup = tcf_skbedit_cleanup, | |
204 | .init = tcf_skbedit_init, | |
205 | .walk = tcf_generic_walker, | |
206 | }; | |
207 | ||
208 | MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); | |
209 | MODULE_DESCRIPTION("SKB Editing"); | |
210 | MODULE_LICENSE("GPL"); | |
211 | ||
212 | static int __init skbedit_init_module(void) | |
213 | { | |
214 | return tcf_register_action(&act_skbedit_ops); | |
215 | } | |
216 | ||
217 | static void __exit skbedit_cleanup_module(void) | |
218 | { | |
219 | tcf_unregister_action(&act_skbedit_ops); | |
220 | } | |
221 | ||
222 | module_init(skbedit_init_module); | |
223 | module_exit(skbedit_cleanup_module); |