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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 | |
42 | static int tcf_skbedit(struct sk_buff *skb, struct tc_action *a, |
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; |
49 | d->tcf_bstats.bytes += qdisc_pkt_len(skb); |
50 | d->tcf_bstats.packets++; |
51 | |
52 | if (d->flags & SKBEDIT_F_PRIORITY) |
53 | skb->priority = d->priority; |
54 | if (d->flags & SKBEDIT_F_QUEUE_MAPPING && |
55 | skb->dev->real_num_tx_queues > d->queue_mapping) |
56 | skb_set_queue_mapping(skb, d->queue_mapping); |
57 | |
58 | spin_unlock(&d->tcf_lock); |
59 | return d->tcf_action; |
60 | } |
61 | |
62 | static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { |
63 | [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, |
64 | [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, |
65 | [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, |
66 | }; |
67 | |
68 | static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est, |
69 | struct tc_action *a, int ovr, int bind) |
70 | { |
71 | struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; |
72 | struct tc_skbedit *parm; |
73 | struct tcf_skbedit *d; |
74 | struct tcf_common *pc; |
75 | u32 flags = 0, *priority = NULL; |
76 | u16 *queue_mapping = NULL; |
77 | int ret = 0, err; |
78 | |
79 | if (nla == NULL) |
80 | return -EINVAL; |
81 | |
82 | err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); |
83 | if (err < 0) |
84 | return err; |
85 | |
86 | if (tb[TCA_SKBEDIT_PARMS] == NULL) |
87 | return -EINVAL; |
88 | |
89 | if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { |
90 | flags |= SKBEDIT_F_PRIORITY; |
91 | priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); |
92 | } |
93 | |
94 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { |
95 | flags |= SKBEDIT_F_QUEUE_MAPPING; |
96 | queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); |
97 | } |
98 | if (!flags) |
99 | return -EINVAL; |
100 | |
101 | parm = nla_data(tb[TCA_SKBEDIT_PARMS]); |
102 | |
103 | pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info); |
104 | if (!pc) { |
105 | pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, |
106 | &skbedit_idx_gen, &skbedit_hash_info); |
107 | if (IS_ERR(pc)) |
108 | return PTR_ERR(pc); |
109 | |
110 | d = to_skbedit(pc); |
111 | ret = ACT_P_CREATED; |
112 | } else { |
113 | d = to_skbedit(pc); |
114 | if (!ovr) { |
115 | tcf_hash_release(pc, bind, &skbedit_hash_info); |
116 | return -EEXIST; |
117 | } |
118 | } |
119 | |
120 | spin_lock_bh(&d->tcf_lock); |
121 | |
122 | d->flags = flags; |
123 | if (flags & SKBEDIT_F_PRIORITY) |
124 | d->priority = *priority; |
125 | if (flags & SKBEDIT_F_QUEUE_MAPPING) |
126 | d->queue_mapping = *queue_mapping; |
127 | d->tcf_action = parm->action; |
128 | |
129 | spin_unlock_bh(&d->tcf_lock); |
130 | |
131 | if (ret == ACT_P_CREATED) |
132 | tcf_hash_insert(pc, &skbedit_hash_info); |
133 | return ret; |
134 | } |
135 | |
136 | static inline int tcf_skbedit_cleanup(struct tc_action *a, int bind) |
137 | { |
138 | struct tcf_skbedit *d = a->priv; |
139 | |
140 | if (d) |
141 | return tcf_hash_release(&d->common, bind, &skbedit_hash_info); |
142 | return 0; |
143 | } |
144 | |
145 | static inline int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
146 | int bind, int ref) |
147 | { |
148 | unsigned char *b = skb_tail_pointer(skb); |
149 | struct tcf_skbedit *d = a->priv; |
150 | struct tc_skbedit opt; |
151 | struct tcf_t t; |
152 | |
153 | opt.index = d->tcf_index; |
154 | opt.refcnt = d->tcf_refcnt - ref; |
155 | opt.bindcnt = d->tcf_bindcnt - bind; |
156 | opt.action = d->tcf_action; |
157 | NLA_PUT(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt); |
158 | if (d->flags & SKBEDIT_F_PRIORITY) |
159 | NLA_PUT(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), |
160 | &d->priority); |
161 | if (d->flags & SKBEDIT_F_QUEUE_MAPPING) |
162 | NLA_PUT(skb, TCA_SKBEDIT_QUEUE_MAPPING, |
163 | sizeof(d->queue_mapping), &d->queue_mapping); |
164 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
165 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); |
166 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); |
167 | NLA_PUT(skb, TCA_SKBEDIT_TM, sizeof(t), &t); |
168 | return skb->len; |
169 | |
170 | nla_put_failure: |
171 | nlmsg_trim(skb, b); |
172 | return -1; |
173 | } |
174 | |
175 | static struct tc_action_ops act_skbedit_ops = { |
176 | .kind = "skbedit", |
177 | .hinfo = &skbedit_hash_info, |
178 | .type = TCA_ACT_SKBEDIT, |
179 | .capab = TCA_CAP_NONE, |
180 | .owner = THIS_MODULE, |
181 | .act = tcf_skbedit, |
182 | .dump = tcf_skbedit_dump, |
183 | .cleanup = tcf_skbedit_cleanup, |
184 | .init = tcf_skbedit_init, |
185 | .walk = tcf_generic_walker, |
186 | }; |
187 | |
188 | MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); |
189 | MODULE_DESCRIPTION("SKB Editing"); |
190 | MODULE_LICENSE("GPL"); |
191 | |
192 | static int __init skbedit_init_module(void) |
193 | { |
194 | return tcf_register_action(&act_skbedit_ops); |
195 | } |
196 | |
197 | static void __exit skbedit_cleanup_module(void) |
198 | { |
199 | tcf_unregister_action(&act_skbedit_ops); |
200 | } |
201 | |
202 | module_init(skbedit_init_module); |
203 | module_exit(skbedit_cleanup_module); |
204 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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