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, see <http://www.gnu.org/licenses/>.
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 static unsigned int skbedit_net_id;
31 static struct tc_action_ops act_skbedit_ops;
32
tcf_skbedit(struct sk_buff * skb,const struct tc_action * a,struct tcf_result * res)33 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
34 struct tcf_result *res)
35 {
36 struct tcf_skbedit *d = to_skbedit(a);
37
38 spin_lock(&d->tcf_lock);
39 tcf_lastuse_update(&d->tcf_tm);
40 bstats_update(&d->tcf_bstats, skb);
41
42 if (d->flags & SKBEDIT_F_PRIORITY)
43 skb->priority = d->priority;
44 if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
45 skb->dev->real_num_tx_queues > d->queue_mapping)
46 skb_set_queue_mapping(skb, d->queue_mapping);
47 if (d->flags & SKBEDIT_F_MARK) {
48 skb->mark &= ~d->mask;
49 skb->mark |= d->mark & d->mask;
50 }
51 if (d->flags & SKBEDIT_F_PTYPE)
52 skb->pkt_type = d->ptype;
53
54 spin_unlock(&d->tcf_lock);
55 return d->tcf_action;
56 }
57
58 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
59 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
60 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
61 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
62 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
63 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
64 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
65 };
66
tcf_skbedit_init(struct net * net,struct nlattr * nla,struct nlattr * est,struct tc_action ** a,int ovr,int bind)67 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
68 struct nlattr *est, struct tc_action **a,
69 int ovr, int bind)
70 {
71 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
72 struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
73 struct tc_skbedit *parm;
74 struct tcf_skbedit *d;
75 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
76 u16 *queue_mapping = NULL, *ptype = NULL;
77 bool exists = false;
78 int ret = 0, err;
79
80 if (nla == NULL)
81 return -EINVAL;
82
83 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy, NULL);
84 if (err < 0)
85 return err;
86
87 if (tb[TCA_SKBEDIT_PARMS] == NULL)
88 return -EINVAL;
89
90 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
91 flags |= SKBEDIT_F_PRIORITY;
92 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
93 }
94
95 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
96 flags |= SKBEDIT_F_QUEUE_MAPPING;
97 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
98 }
99
100 if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
101 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
102 if (!skb_pkt_type_ok(*ptype))
103 return -EINVAL;
104 flags |= SKBEDIT_F_PTYPE;
105 }
106
107 if (tb[TCA_SKBEDIT_MARK] != NULL) {
108 flags |= SKBEDIT_F_MARK;
109 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
110 }
111
112 if (tb[TCA_SKBEDIT_MASK] != NULL) {
113 flags |= SKBEDIT_F_MASK;
114 mask = nla_data(tb[TCA_SKBEDIT_MASK]);
115 }
116
117 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
118
119 exists = tcf_idr_check(tn, parm->index, a, bind);
120 if (exists && bind)
121 return 0;
122
123 if (!flags) {
124 if (exists)
125 tcf_idr_release(*a, bind);
126 return -EINVAL;
127 }
128
129 if (!exists) {
130 ret = tcf_idr_create(tn, parm->index, est, a,
131 &act_skbedit_ops, bind, false);
132 if (ret)
133 return ret;
134
135 d = to_skbedit(*a);
136 ret = ACT_P_CREATED;
137 } else {
138 d = to_skbedit(*a);
139 tcf_idr_release(*a, bind);
140 if (!ovr)
141 return -EEXIST;
142 }
143
144 spin_lock_bh(&d->tcf_lock);
145
146 d->flags = flags;
147 if (flags & SKBEDIT_F_PRIORITY)
148 d->priority = *priority;
149 if (flags & SKBEDIT_F_QUEUE_MAPPING)
150 d->queue_mapping = *queue_mapping;
151 if (flags & SKBEDIT_F_MARK)
152 d->mark = *mark;
153 if (flags & SKBEDIT_F_PTYPE)
154 d->ptype = *ptype;
155 /* default behaviour is to use all the bits */
156 d->mask = 0xffffffff;
157 if (flags & SKBEDIT_F_MASK)
158 d->mask = *mask;
159
160 d->tcf_action = parm->action;
161
162 spin_unlock_bh(&d->tcf_lock);
163
164 if (ret == ACT_P_CREATED)
165 tcf_idr_insert(tn, *a);
166 return ret;
167 }
168
tcf_skbedit_dump(struct sk_buff * skb,struct tc_action * a,int bind,int ref)169 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
170 int bind, int ref)
171 {
172 unsigned char *b = skb_tail_pointer(skb);
173 struct tcf_skbedit *d = to_skbedit(a);
174 struct tc_skbedit opt = {
175 .index = d->tcf_index,
176 .refcnt = d->tcf_refcnt - ref,
177 .bindcnt = d->tcf_bindcnt - bind,
178 .action = d->tcf_action,
179 };
180 struct tcf_t t;
181
182 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
183 goto nla_put_failure;
184 if ((d->flags & SKBEDIT_F_PRIORITY) &&
185 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority))
186 goto nla_put_failure;
187 if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
188 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping))
189 goto nla_put_failure;
190 if ((d->flags & SKBEDIT_F_MARK) &&
191 nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark))
192 goto nla_put_failure;
193 if ((d->flags & SKBEDIT_F_PTYPE) &&
194 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype))
195 goto nla_put_failure;
196 if ((d->flags & SKBEDIT_F_MASK) &&
197 nla_put_u32(skb, TCA_SKBEDIT_MASK, d->mask))
198 goto nla_put_failure;
199
200 tcf_tm_dump(&t, &d->tcf_tm);
201 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
202 goto nla_put_failure;
203 return skb->len;
204
205 nla_put_failure:
206 nlmsg_trim(skb, b);
207 return -1;
208 }
209
tcf_skbedit_walker(struct net * net,struct sk_buff * skb,struct netlink_callback * cb,int type,const struct tc_action_ops * ops)210 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
211 struct netlink_callback *cb, int type,
212 const struct tc_action_ops *ops)
213 {
214 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
215
216 return tcf_generic_walker(tn, skb, cb, type, ops);
217 }
218
tcf_skbedit_search(struct net * net,struct tc_action ** a,u32 index)219 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
220 {
221 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
222
223 return tcf_idr_search(tn, a, index);
224 }
225
226 static struct tc_action_ops act_skbedit_ops = {
227 .kind = "skbedit",
228 .type = TCA_ACT_SKBEDIT,
229 .owner = THIS_MODULE,
230 .act = tcf_skbedit,
231 .dump = tcf_skbedit_dump,
232 .init = tcf_skbedit_init,
233 .walk = tcf_skbedit_walker,
234 .lookup = tcf_skbedit_search,
235 .size = sizeof(struct tcf_skbedit),
236 };
237
skbedit_init_net(struct net * net)238 static __net_init int skbedit_init_net(struct net *net)
239 {
240 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
241
242 return tc_action_net_init(net, tn, &act_skbedit_ops);
243 }
244
skbedit_exit_net(struct net * net)245 static void __net_exit skbedit_exit_net(struct net *net)
246 {
247 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
248
249 tc_action_net_exit(tn);
250 }
251
252 static struct pernet_operations skbedit_net_ops = {
253 .init = skbedit_init_net,
254 .exit = skbedit_exit_net,
255 .id = &skbedit_net_id,
256 .size = sizeof(struct tc_action_net),
257 };
258
259 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
260 MODULE_DESCRIPTION("SKB Editing");
261 MODULE_LICENSE("GPL");
262
skbedit_init_module(void)263 static int __init skbedit_init_module(void)
264 {
265 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
266 }
267
skbedit_cleanup_module(void)268 static void __exit skbedit_cleanup_module(void)
269 {
270 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
271 }
272
273 module_init(skbedit_init_module);
274 module_exit(skbedit_cleanup_module);
275