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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); | |
9c4a4e48 | 40 | tcf_lastuse_update(&d->tcf_tm); |
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 | 71 | u16 *queue_mapping = NULL; |
b2313077 WC |
72 | bool exists = false; |
73 | int ret = 0, err; | |
ca9b0e27 AD |
74 | |
75 | if (nla == NULL) | |
76 | return -EINVAL; | |
77 | ||
78 | err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); | |
79 | if (err < 0) | |
80 | return err; | |
81 | ||
82 | if (tb[TCA_SKBEDIT_PARMS] == NULL) | |
83 | return -EINVAL; | |
84 | ||
85 | if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { | |
86 | flags |= SKBEDIT_F_PRIORITY; | |
87 | priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); | |
88 | } | |
89 | ||
90 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { | |
91 | flags |= SKBEDIT_F_QUEUE_MAPPING; | |
92 | queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); | |
93 | } | |
1c55d62e | 94 | |
95 | if (tb[TCA_SKBEDIT_MARK] != NULL) { | |
96 | flags |= SKBEDIT_F_MARK; | |
97 | mark = nla_data(tb[TCA_SKBEDIT_MARK]); | |
98 | } | |
99 | ||
ca9b0e27 AD |
100 | parm = nla_data(tb[TCA_SKBEDIT_PARMS]); |
101 | ||
5e1567ae JHS |
102 | exists = tcf_hash_check(tn, parm->index, a, bind); |
103 | if (exists && bind) | |
104 | return 0; | |
105 | ||
106 | if (!flags) { | |
107 | tcf_hash_release(a, bind); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | if (!exists) { | |
ddf97ccd WC |
112 | ret = tcf_hash_create(tn, parm->index, est, a, |
113 | sizeof(*d), bind, false); | |
86062033 WC |
114 | if (ret) |
115 | return ret; | |
ca9b0e27 | 116 | |
86062033 | 117 | d = to_skbedit(a); |
ca9b0e27 AD |
118 | ret = ACT_P_CREATED; |
119 | } else { | |
86062033 | 120 | d = to_skbedit(a); |
86062033 | 121 | tcf_hash_release(a, bind); |
1a29321e | 122 | if (!ovr) |
ca9b0e27 | 123 | return -EEXIST; |
ca9b0e27 AD |
124 | } |
125 | ||
126 | spin_lock_bh(&d->tcf_lock); | |
127 | ||
128 | d->flags = flags; | |
129 | if (flags & SKBEDIT_F_PRIORITY) | |
130 | d->priority = *priority; | |
131 | if (flags & SKBEDIT_F_QUEUE_MAPPING) | |
132 | d->queue_mapping = *queue_mapping; | |
1c55d62e | 133 | if (flags & SKBEDIT_F_MARK) |
134 | d->mark = *mark; | |
135 | ||
ca9b0e27 AD |
136 | d->tcf_action = parm->action; |
137 | ||
138 | spin_unlock_bh(&d->tcf_lock); | |
139 | ||
140 | if (ret == ACT_P_CREATED) | |
ddf97ccd | 141 | tcf_hash_insert(tn, a); |
ca9b0e27 AD |
142 | return ret; |
143 | } | |
144 | ||
cc7ec456 ED |
145 | static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
146 | int bind, int ref) | |
ca9b0e27 AD |
147 | { |
148 | unsigned char *b = skb_tail_pointer(skb); | |
149 | struct tcf_skbedit *d = a->priv; | |
1c40be12 ED |
150 | struct tc_skbedit opt = { |
151 | .index = d->tcf_index, | |
152 | .refcnt = d->tcf_refcnt - ref, | |
153 | .bindcnt = d->tcf_bindcnt - bind, | |
154 | .action = d->tcf_action, | |
155 | }; | |
ca9b0e27 AD |
156 | struct tcf_t t; |
157 | ||
1b34ec43 DM |
158 | if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) |
159 | goto nla_put_failure; | |
160 | if ((d->flags & SKBEDIT_F_PRIORITY) && | |
161 | nla_put(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), | |
162 | &d->priority)) | |
163 | goto nla_put_failure; | |
164 | if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && | |
165 | nla_put(skb, TCA_SKBEDIT_QUEUE_MAPPING, | |
166 | sizeof(d->queue_mapping), &d->queue_mapping)) | |
167 | goto nla_put_failure; | |
168 | if ((d->flags & SKBEDIT_F_MARK) && | |
169 | nla_put(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), | |
170 | &d->mark)) | |
171 | goto nla_put_failure; | |
48d8ee16 JHS |
172 | |
173 | tcf_tm_dump(&t, &d->tcf_tm); | |
9854518e | 174 | if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) |
1b34ec43 | 175 | goto nla_put_failure; |
ca9b0e27 AD |
176 | return skb->len; |
177 | ||
178 | nla_put_failure: | |
179 | nlmsg_trim(skb, b); | |
180 | return -1; | |
181 | } | |
182 | ||
ddf97ccd WC |
183 | static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb, |
184 | struct netlink_callback *cb, int type, | |
185 | struct tc_action *a) | |
186 | { | |
187 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
188 | ||
189 | return tcf_generic_walker(tn, skb, cb, type, a); | |
190 | } | |
191 | ||
192 | static int tcf_skbedit_search(struct net *net, struct tc_action *a, u32 index) | |
193 | { | |
194 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
195 | ||
196 | return tcf_hash_search(tn, a, index); | |
197 | } | |
198 | ||
ca9b0e27 AD |
199 | static struct tc_action_ops act_skbedit_ops = { |
200 | .kind = "skbedit", | |
ca9b0e27 | 201 | .type = TCA_ACT_SKBEDIT, |
ca9b0e27 AD |
202 | .owner = THIS_MODULE, |
203 | .act = tcf_skbedit, | |
204 | .dump = tcf_skbedit_dump, | |
ca9b0e27 | 205 | .init = tcf_skbedit_init, |
ddf97ccd WC |
206 | .walk = tcf_skbedit_walker, |
207 | .lookup = tcf_skbedit_search, | |
208 | }; | |
209 | ||
210 | static __net_init int skbedit_init_net(struct net *net) | |
211 | { | |
212 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
213 | ||
214 | return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK); | |
215 | } | |
216 | ||
217 | static void __net_exit skbedit_exit_net(struct net *net) | |
218 | { | |
219 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
220 | ||
221 | tc_action_net_exit(tn); | |
222 | } | |
223 | ||
224 | static struct pernet_operations skbedit_net_ops = { | |
225 | .init = skbedit_init_net, | |
226 | .exit = skbedit_exit_net, | |
227 | .id = &skbedit_net_id, | |
228 | .size = sizeof(struct tc_action_net), | |
ca9b0e27 AD |
229 | }; |
230 | ||
231 | MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); | |
232 | MODULE_DESCRIPTION("SKB Editing"); | |
233 | MODULE_LICENSE("GPL"); | |
234 | ||
235 | static int __init skbedit_init_module(void) | |
236 | { | |
ddf97ccd | 237 | return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); |
ca9b0e27 AD |
238 | } |
239 | ||
240 | static void __exit skbedit_cleanup_module(void) | |
241 | { | |
ddf97ccd | 242 | tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); |
ca9b0e27 AD |
243 | } |
244 | ||
245 | module_init(skbedit_init_module); | |
246 | module_exit(skbedit_cleanup_module); |