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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 | |
c057b190 | 14 | * this program; if not, see <http://www.gnu.org/licenses/>. |
ca9b0e27 AD |
15 | * |
16 | * Author: Alexander Duyck <alexander.h.duyck@intel.com> | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/rtnetlink.h> | |
24 | #include <net/netlink.h> | |
25 | #include <net/pkt_sched.h> | |
26 | ||
27 | #include <linux/tc_act/tc_skbedit.h> | |
28 | #include <net/tc_act/tc_skbedit.h> | |
29 | ||
30 | #define SKBEDIT_TAB_MASK 15 | |
ca9b0e27 | 31 | |
ddf97ccd WC |
32 | static int skbedit_net_id; |
33 | ||
dc7f9f6e | 34 | static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a, |
ca9b0e27 AD |
35 | struct tcf_result *res) |
36 | { | |
37 | struct tcf_skbedit *d = a->priv; | |
38 | ||
39 | spin_lock(&d->tcf_lock); | |
40 | d->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 41 | bstats_update(&d->tcf_bstats, skb); |
ca9b0e27 AD |
42 | |
43 | if (d->flags & SKBEDIT_F_PRIORITY) | |
44 | skb->priority = d->priority; | |
45 | if (d->flags & SKBEDIT_F_QUEUE_MAPPING && | |
46 | skb->dev->real_num_tx_queues > d->queue_mapping) | |
47 | skb_set_queue_mapping(skb, d->queue_mapping); | |
1c55d62e | 48 | if (d->flags & SKBEDIT_F_MARK) |
49 | skb->mark = d->mark; | |
ca9b0e27 AD |
50 | |
51 | spin_unlock(&d->tcf_lock); | |
52 | return d->tcf_action; | |
53 | } | |
54 | ||
55 | static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { | |
56 | [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, | |
57 | [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, | |
58 | [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, | |
1c55d62e | 59 | [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, |
ca9b0e27 AD |
60 | }; |
61 | ||
c1b52739 BL |
62 | static int tcf_skbedit_init(struct net *net, struct nlattr *nla, |
63 | struct nlattr *est, struct tc_action *a, | |
64 | int ovr, int bind) | |
ca9b0e27 | 65 | { |
ddf97ccd | 66 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); |
ca9b0e27 AD |
67 | struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; |
68 | struct tc_skbedit *parm; | |
69 | struct tcf_skbedit *d; | |
1c55d62e | 70 | u32 flags = 0, *priority = NULL, *mark = NULL; |
ca9b0e27 AD |
71 | u16 *queue_mapping = NULL; |
72 | int ret = 0, err; | |
73 | ||
74 | if (nla == NULL) | |
75 | return -EINVAL; | |
76 | ||
77 | err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); | |
78 | if (err < 0) | |
79 | return err; | |
80 | ||
81 | if (tb[TCA_SKBEDIT_PARMS] == NULL) | |
82 | return -EINVAL; | |
83 | ||
84 | if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { | |
85 | flags |= SKBEDIT_F_PRIORITY; | |
86 | priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); | |
87 | } | |
88 | ||
89 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { | |
90 | flags |= SKBEDIT_F_QUEUE_MAPPING; | |
91 | queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); | |
92 | } | |
1c55d62e | 93 | |
94 | if (tb[TCA_SKBEDIT_MARK] != NULL) { | |
95 | flags |= SKBEDIT_F_MARK; | |
96 | mark = nla_data(tb[TCA_SKBEDIT_MARK]); | |
97 | } | |
98 | ||
ca9b0e27 AD |
99 | if (!flags) |
100 | return -EINVAL; | |
101 | ||
102 | parm = nla_data(tb[TCA_SKBEDIT_PARMS]); | |
103 | ||
ddf97ccd WC |
104 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
105 | ret = tcf_hash_create(tn, parm->index, est, a, | |
106 | sizeof(*d), bind, false); | |
86062033 WC |
107 | if (ret) |
108 | return ret; | |
ca9b0e27 | 109 | |
86062033 | 110 | d = to_skbedit(a); |
ca9b0e27 AD |
111 | ret = ACT_P_CREATED; |
112 | } else { | |
86062033 | 113 | d = to_skbedit(a); |
1a29321e JHS |
114 | if (bind) |
115 | return 0; | |
86062033 | 116 | tcf_hash_release(a, bind); |
1a29321e | 117 | if (!ovr) |
ca9b0e27 | 118 | return -EEXIST; |
ca9b0e27 AD |
119 | } |
120 | ||
121 | spin_lock_bh(&d->tcf_lock); | |
122 | ||
123 | d->flags = flags; | |
124 | if (flags & SKBEDIT_F_PRIORITY) | |
125 | d->priority = *priority; | |
126 | if (flags & SKBEDIT_F_QUEUE_MAPPING) | |
127 | d->queue_mapping = *queue_mapping; | |
1c55d62e | 128 | if (flags & SKBEDIT_F_MARK) |
129 | d->mark = *mark; | |
130 | ||
ca9b0e27 AD |
131 | d->tcf_action = parm->action; |
132 | ||
133 | spin_unlock_bh(&d->tcf_lock); | |
134 | ||
135 | if (ret == ACT_P_CREATED) | |
ddf97ccd | 136 | tcf_hash_insert(tn, a); |
ca9b0e27 AD |
137 | return ret; |
138 | } | |
139 | ||
cc7ec456 ED |
140 | static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
141 | int bind, int ref) | |
ca9b0e27 AD |
142 | { |
143 | unsigned char *b = skb_tail_pointer(skb); | |
144 | struct tcf_skbedit *d = a->priv; | |
1c40be12 ED |
145 | struct tc_skbedit opt = { |
146 | .index = d->tcf_index, | |
147 | .refcnt = d->tcf_refcnt - ref, | |
148 | .bindcnt = d->tcf_bindcnt - bind, | |
149 | .action = d->tcf_action, | |
150 | }; | |
ca9b0e27 AD |
151 | struct tcf_t t; |
152 | ||
1b34ec43 DM |
153 | if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) |
154 | goto nla_put_failure; | |
155 | if ((d->flags & SKBEDIT_F_PRIORITY) && | |
156 | nla_put(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), | |
157 | &d->priority)) | |
158 | goto nla_put_failure; | |
159 | if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && | |
160 | nla_put(skb, TCA_SKBEDIT_QUEUE_MAPPING, | |
161 | sizeof(d->queue_mapping), &d->queue_mapping)) | |
162 | goto nla_put_failure; | |
163 | if ((d->flags & SKBEDIT_F_MARK) && | |
164 | nla_put(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), | |
165 | &d->mark)) | |
166 | goto nla_put_failure; | |
ca9b0e27 AD |
167 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
168 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
169 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
1b34ec43 DM |
170 | if (nla_put(skb, TCA_SKBEDIT_TM, sizeof(t), &t)) |
171 | goto nla_put_failure; | |
ca9b0e27 AD |
172 | return skb->len; |
173 | ||
174 | nla_put_failure: | |
175 | nlmsg_trim(skb, b); | |
176 | return -1; | |
177 | } | |
178 | ||
ddf97ccd WC |
179 | static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb, |
180 | struct netlink_callback *cb, int type, | |
181 | struct tc_action *a) | |
182 | { | |
183 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
184 | ||
185 | return tcf_generic_walker(tn, skb, cb, type, a); | |
186 | } | |
187 | ||
188 | static int tcf_skbedit_search(struct net *net, struct tc_action *a, u32 index) | |
189 | { | |
190 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
191 | ||
192 | return tcf_hash_search(tn, a, index); | |
193 | } | |
194 | ||
ca9b0e27 AD |
195 | static struct tc_action_ops act_skbedit_ops = { |
196 | .kind = "skbedit", | |
ca9b0e27 | 197 | .type = TCA_ACT_SKBEDIT, |
ca9b0e27 AD |
198 | .owner = THIS_MODULE, |
199 | .act = tcf_skbedit, | |
200 | .dump = tcf_skbedit_dump, | |
ca9b0e27 | 201 | .init = tcf_skbedit_init, |
ddf97ccd WC |
202 | .walk = tcf_skbedit_walker, |
203 | .lookup = tcf_skbedit_search, | |
204 | }; | |
205 | ||
206 | static __net_init int skbedit_init_net(struct net *net) | |
207 | { | |
208 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
209 | ||
210 | return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK); | |
211 | } | |
212 | ||
213 | static void __net_exit skbedit_exit_net(struct net *net) | |
214 | { | |
215 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
216 | ||
217 | tc_action_net_exit(tn); | |
218 | } | |
219 | ||
220 | static struct pernet_operations skbedit_net_ops = { | |
221 | .init = skbedit_init_net, | |
222 | .exit = skbedit_exit_net, | |
223 | .id = &skbedit_net_id, | |
224 | .size = sizeof(struct tc_action_net), | |
ca9b0e27 AD |
225 | }; |
226 | ||
227 | MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); | |
228 | MODULE_DESCRIPTION("SKB Editing"); | |
229 | MODULE_LICENSE("GPL"); | |
230 | ||
231 | static int __init skbedit_init_module(void) | |
232 | { | |
ddf97ccd | 233 | return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); |
ca9b0e27 AD |
234 | } |
235 | ||
236 | static void __exit skbedit_cleanup_module(void) | |
237 | { | |
ddf97ccd | 238 | tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); |
ca9b0e27 AD |
239 | } |
240 | ||
241 | module_init(skbedit_init_module); | |
242 | module_exit(skbedit_cleanup_module); |