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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
32static struct tcf_common *tcf_skbedit_ht[SKBEDIT_TAB_MASK + 1];
33static u32 skbedit_idx_gen;
34static DEFINE_RWLOCK(skbedit_lock);
35
36static struct tcf_hashinfo skbedit_hash_info = {
37 .htab = tcf_skbedit_ht,
38 .hmask = SKBEDIT_TAB_MASK,
39 .lock = &skbedit_lock,
40};
41
42static int tcf_skbedit(struct sk_buff *skb, const 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 bstats_update(&d->tcf_bstats, skb);
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);
56 if (d->flags & SKBEDIT_F_MARK)
57 skb->mark = d->mark;
58
59 spin_unlock(&d->tcf_lock);
60 return d->tcf_action;
61}
62
63static 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) },
67 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
68};
69
70static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
71 struct nlattr *est, struct tc_action *a,
72 int ovr, int bind)
73{
74 struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
75 struct tc_skbedit *parm;
76 struct tcf_skbedit *d;
77 struct tcf_common *pc;
78 u32 flags = 0, *priority = NULL, *mark = NULL;
79 u16 *queue_mapping = NULL;
80 int ret = 0, err;
81
82 if (nla == NULL)
83 return -EINVAL;
84
85 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
86 if (err < 0)
87 return err;
88
89 if (tb[TCA_SKBEDIT_PARMS] == NULL)
90 return -EINVAL;
91
92 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
93 flags |= SKBEDIT_F_PRIORITY;
94 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
95 }
96
97 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
98 flags |= SKBEDIT_F_QUEUE_MAPPING;
99 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
100 }
101
102 if (tb[TCA_SKBEDIT_MARK] != NULL) {
103 flags |= SKBEDIT_F_MARK;
104 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
105 }
106
107 if (!flags)
108 return -EINVAL;
109
110 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
111
112 pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info);
113 if (!pc) {
114 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
115 &skbedit_idx_gen, &skbedit_hash_info);
116 if (IS_ERR(pc))
117 return PTR_ERR(pc);
118
119 d = to_skbedit(pc);
120 ret = ACT_P_CREATED;
121 } else {
122 d = to_skbedit(pc);
123 if (!ovr) {
124 tcf_hash_release(pc, bind, &skbedit_hash_info);
125 return -EEXIST;
126 }
127 }
128
129 spin_lock_bh(&d->tcf_lock);
130
131 d->flags = flags;
132 if (flags & SKBEDIT_F_PRIORITY)
133 d->priority = *priority;
134 if (flags & SKBEDIT_F_QUEUE_MAPPING)
135 d->queue_mapping = *queue_mapping;
136 if (flags & SKBEDIT_F_MARK)
137 d->mark = *mark;
138
139 d->tcf_action = parm->action;
140
141 spin_unlock_bh(&d->tcf_lock);
142
143 if (ret == ACT_P_CREATED)
144 tcf_hash_insert(pc, &skbedit_hash_info);
145 return ret;
146}
147
148static int tcf_skbedit_cleanup(struct tc_action *a, int bind)
149{
150 struct tcf_skbedit *d = a->priv;
151
152 if (d)
153 return tcf_hash_release(&d->common, bind, &skbedit_hash_info);
154 return 0;
155}
156
157static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
158 int bind, int ref)
159{
160 unsigned char *b = skb_tail_pointer(skb);
161 struct tcf_skbedit *d = a->priv;
162 struct tc_skbedit opt = {
163 .index = d->tcf_index,
164 .refcnt = d->tcf_refcnt - ref,
165 .bindcnt = d->tcf_bindcnt - bind,
166 .action = d->tcf_action,
167 };
168 struct tcf_t t;
169
170 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
171 goto nla_put_failure;
172 if ((d->flags & SKBEDIT_F_PRIORITY) &&
173 nla_put(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority),
174 &d->priority))
175 goto nla_put_failure;
176 if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
177 nla_put(skb, TCA_SKBEDIT_QUEUE_MAPPING,
178 sizeof(d->queue_mapping), &d->queue_mapping))
179 goto nla_put_failure;
180 if ((d->flags & SKBEDIT_F_MARK) &&
181 nla_put(skb, TCA_SKBEDIT_MARK, sizeof(d->mark),
182 &d->mark))
183 goto nla_put_failure;
184 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
185 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
186 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
187 if (nla_put(skb, TCA_SKBEDIT_TM, sizeof(t), &t))
188 goto nla_put_failure;
189 return skb->len;
190
191nla_put_failure:
192 nlmsg_trim(skb, b);
193 return -1;
194}
195
196static struct tc_action_ops act_skbedit_ops = {
197 .kind = "skbedit",
198 .hinfo = &skbedit_hash_info,
199 .type = TCA_ACT_SKBEDIT,
200 .capab = TCA_CAP_NONE,
201 .owner = THIS_MODULE,
202 .act = tcf_skbedit,
203 .dump = tcf_skbedit_dump,
204 .cleanup = tcf_skbedit_cleanup,
205 .init = tcf_skbedit_init,
206 .walk = tcf_generic_walker,
207};
208
209MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
210MODULE_DESCRIPTION("SKB Editing");
211MODULE_LICENSE("GPL");
212
213static int __init skbedit_init_module(void)
214{
215 return tcf_register_action(&act_skbedit_ops);
216}
217
218static void __exit skbedit_cleanup_module(void)
219{
220 tcf_unregister_action(&act_skbedit_ops);
221}
222
223module_init(skbedit_init_module);
224module_exit(skbedit_cleanup_module);
225
