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Linux/net/sched/act_simple.c

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  1 /*
  2  * net/sched/act_simple.c       Simple example of an action
  3  *
  4  *              This program is free software; you can redistribute it and/or
  5  *              modify it under the terms of the GNU General Public License
  6  *              as published by the Free Software Foundation; either version
  7  *              2 of the License, or (at your option) any later version.
  8  *
  9  * Authors:     Jamal Hadi Salim (2005-8)
 10  *
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/slab.h>
 15 #include <linux/init.h>
 16 #include <linux/kernel.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/rtnetlink.h>
 19 #include <net/netlink.h>
 20 #include <net/pkt_sched.h>
 21 
 22 #define TCA_ACT_SIMP 22
 23 
 24 #include <linux/tc_act/tc_defact.h>
 25 #include <net/tc_act/tc_defact.h>
 26 
 27 #define SIMP_TAB_MASK     7
 28 
 29 static int simp_net_id;
 30 
 31 #define SIMP_MAX_DATA   32
 32 static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
 33                     struct tcf_result *res)
 34 {
 35         struct tcf_defact *d = a->priv;
 36 
 37         spin_lock(&d->tcf_lock);
 38         d->tcf_tm.lastuse = jiffies;
 39         bstats_update(&d->tcf_bstats, skb);
 40 
 41         /* print policy string followed by _ then packet count
 42          * Example if this was the 3rd packet and the string was "hello"
 43          * then it would look like "hello_3" (without quotes)
 44          */
 45         pr_info("simple: %s_%d\n",
 46                (char *)d->tcfd_defdata, d->tcf_bstats.packets);
 47         spin_unlock(&d->tcf_lock);
 48         return d->tcf_action;
 49 }
 50 
 51 static void tcf_simp_release(struct tc_action *a, int bind)
 52 {
 53         struct tcf_defact *d = to_defact(a);
 54         kfree(d->tcfd_defdata);
 55 }
 56 
 57 static int alloc_defdata(struct tcf_defact *d, char *defdata)
 58 {
 59         d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
 60         if (unlikely(!d->tcfd_defdata))
 61                 return -ENOMEM;
 62         strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
 63         return 0;
 64 }
 65 
 66 static void reset_policy(struct tcf_defact *d, char *defdata,
 67                          struct tc_defact *p)
 68 {
 69         spin_lock_bh(&d->tcf_lock);
 70         d->tcf_action = p->action;
 71         memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
 72         strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
 73         spin_unlock_bh(&d->tcf_lock);
 74 }
 75 
 76 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
 77         [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
 78         [TCA_DEF_DATA]  = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
 79 };
 80 
 81 static int tcf_simp_init(struct net *net, struct nlattr *nla,
 82                          struct nlattr *est, struct tc_action *a,
 83                          int ovr, int bind)
 84 {
 85         struct tc_action_net *tn = net_generic(net, simp_net_id);
 86         struct nlattr *tb[TCA_DEF_MAX + 1];
 87         struct tc_defact *parm;
 88         struct tcf_defact *d;
 89         char *defdata;
 90         int ret = 0, err, exists = 0;
 91 
 92         if (nla == NULL)
 93                 return -EINVAL;
 94 
 95         err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
 96         if (err < 0)
 97                 return err;
 98 
 99         if (tb[TCA_DEF_PARMS] == NULL)
100                 return -EINVAL;
101 
102 
103         parm = nla_data(tb[TCA_DEF_PARMS]);
104         exists = tcf_hash_check(tn, parm->index, a, bind);
105         if (exists && bind)
106                 return 0;
107 
108         if (tb[TCA_DEF_DATA] == NULL) {
109                 if (exists)
110                         tcf_hash_release(a, bind);
111                 return -EINVAL;
112         }
113 
114         defdata = nla_data(tb[TCA_DEF_DATA]);
115 
116         if (!exists) {
117                 ret = tcf_hash_create(tn, parm->index, est, a,
118                                       sizeof(*d), bind, false);
119                 if (ret)
120                         return ret;
121 
122                 d = to_defact(a);
123                 ret = alloc_defdata(d, defdata);
124                 if (ret < 0) {
125                         tcf_hash_cleanup(a, est);
126                         return ret;
127                 }
128                 d->tcf_action = parm->action;
129                 ret = ACT_P_CREATED;
130         } else {
131                 d = to_defact(a);
132 
133                 tcf_hash_release(a, bind);
134                 if (!ovr)
135                         return -EEXIST;
136 
137                 reset_policy(d, defdata, parm);
138         }
139 
140         if (ret == ACT_P_CREATED)
141                 tcf_hash_insert(tn, a);
142         return ret;
143 }
144 
145 static int tcf_simp_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_defact *d = a->priv;
150         struct tc_defact opt = {
151                 .index   = d->tcf_index,
152                 .refcnt  = d->tcf_refcnt - ref,
153                 .bindcnt = d->tcf_bindcnt - bind,
154                 .action  = d->tcf_action,
155         };
156         struct tcf_t t;
157 
158         if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
159             nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
160                 goto nla_put_failure;
161         t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
162         t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
163         t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
164         if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
165                 goto nla_put_failure;
166         return skb->len;
167 
168 nla_put_failure:
169         nlmsg_trim(skb, b);
170         return -1;
171 }
172 
173 static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
174                            struct netlink_callback *cb, int type,
175                            struct tc_action *a)
176 {
177         struct tc_action_net *tn = net_generic(net, simp_net_id);
178 
179         return tcf_generic_walker(tn, skb, cb, type, a);
180 }
181 
182 static int tcf_simp_search(struct net *net, struct tc_action *a, u32 index)
183 {
184         struct tc_action_net *tn = net_generic(net, simp_net_id);
185 
186         return tcf_hash_search(tn, a, index);
187 }
188 
189 static struct tc_action_ops act_simp_ops = {
190         .kind           =       "simple",
191         .type           =       TCA_ACT_SIMP,
192         .owner          =       THIS_MODULE,
193         .act            =       tcf_simp,
194         .dump           =       tcf_simp_dump,
195         .cleanup        =       tcf_simp_release,
196         .init           =       tcf_simp_init,
197         .walk           =       tcf_simp_walker,
198         .lookup         =       tcf_simp_search,
199 };
200 
201 static __net_init int simp_init_net(struct net *net)
202 {
203         struct tc_action_net *tn = net_generic(net, simp_net_id);
204 
205         return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
206 }
207 
208 static void __net_exit simp_exit_net(struct net *net)
209 {
210         struct tc_action_net *tn = net_generic(net, simp_net_id);
211 
212         tc_action_net_exit(tn);
213 }
214 
215 static struct pernet_operations simp_net_ops = {
216         .init = simp_init_net,
217         .exit = simp_exit_net,
218         .id   = &simp_net_id,
219         .size = sizeof(struct tc_action_net),
220 };
221 
222 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
223 MODULE_DESCRIPTION("Simple example action");
224 MODULE_LICENSE("GPL");
225 
226 static int __init simp_init_module(void)
227 {
228         int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
229         if (!ret)
230                 pr_info("Simple TC action Loaded\n");
231         return ret;
232 }
233 
234 static void __exit simp_cleanup_module(void)
235 {
236         tcf_unregister_action(&act_simp_ops, &simp_net_ops);
237 }
238 
239 module_init(simp_init_module);
240 module_exit(simp_cleanup_module);
241 

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