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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, 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
62static 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
68static 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
136static 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
145static 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
170nla_put_failure:
171 nlmsg_trim(skb, b);
172 return -1;
173}
174
175static 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
188MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
189MODULE_DESCRIPTION("SKB Editing");
190MODULE_LICENSE("GPL");
191
192static int __init skbedit_init_module(void)
193{
194 return tcf_register_action(&act_skbedit_ops);
195}
196
197static void __exit skbedit_cleanup_module(void)
198{
199 tcf_unregister_action(&act_skbedit_ops);
200}
201
202module_init(skbedit_init_module);
203module_exit(skbedit_cleanup_module);
204
