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Linux/net/sched/act_gact.c

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  1 /*
  2  * net/sched/act_gact.c         Generic actions
  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  * copyright    Jamal Hadi Salim (2002-4)
 10  *
 11  */
 12 
 13 #include <linux/types.h>
 14 #include <linux/kernel.h>
 15 #include <linux/string.h>
 16 #include <linux/errno.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/rtnetlink.h>
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <net/netlink.h>
 22 #include <net/pkt_sched.h>
 23 #include <linux/tc_act/tc_gact.h>
 24 #include <net/tc_act/tc_gact.h>
 25 
 26 static unsigned int gact_net_id;
 27 static struct tc_action_ops act_gact_ops;
 28 
 29 #ifdef CONFIG_GACT_PROB
 30 static int gact_net_rand(struct tcf_gact *gact)
 31 {
 32         smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 33         if (prandom_u32() % gact->tcfg_pval)
 34                 return gact->tcf_action;
 35         return gact->tcfg_paction;
 36 }
 37 
 38 static int gact_determ(struct tcf_gact *gact)
 39 {
 40         u32 pack = atomic_inc_return(&gact->packets);
 41 
 42         smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 43         if (pack % gact->tcfg_pval)
 44                 return gact->tcf_action;
 45         return gact->tcfg_paction;
 46 }
 47 
 48 typedef int (*g_rand)(struct tcf_gact *gact);
 49 static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
 50 #endif /* CONFIG_GACT_PROB */
 51 
 52 static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
 53         [TCA_GACT_PARMS]        = { .len = sizeof(struct tc_gact) },
 54         [TCA_GACT_PROB]         = { .len = sizeof(struct tc_gact_p) },
 55 };
 56 
 57 static int tcf_gact_init(struct net *net, struct nlattr *nla,
 58                          struct nlattr *est, struct tc_action **a,
 59                          int ovr, int bind, struct netlink_ext_ack *extack)
 60 {
 61         struct tc_action_net *tn = net_generic(net, gact_net_id);
 62         struct nlattr *tb[TCA_GACT_MAX + 1];
 63         struct tc_gact *parm;
 64         struct tcf_gact *gact;
 65         int ret = 0;
 66         int err;
 67 #ifdef CONFIG_GACT_PROB
 68         struct tc_gact_p *p_parm = NULL;
 69 #endif
 70 
 71         if (nla == NULL)
 72                 return -EINVAL;
 73 
 74         err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
 75         if (err < 0)
 76                 return err;
 77 
 78         if (tb[TCA_GACT_PARMS] == NULL)
 79                 return -EINVAL;
 80         parm = nla_data(tb[TCA_GACT_PARMS]);
 81 
 82 #ifndef CONFIG_GACT_PROB
 83         if (tb[TCA_GACT_PROB] != NULL)
 84                 return -EOPNOTSUPP;
 85 #else
 86         if (tb[TCA_GACT_PROB]) {
 87                 p_parm = nla_data(tb[TCA_GACT_PROB]);
 88                 if (p_parm->ptype >= MAX_RAND)
 89                         return -EINVAL;
 90         }
 91 #endif
 92 
 93         if (!tcf_idr_check(tn, parm->index, a, bind)) {
 94                 ret = tcf_idr_create(tn, parm->index, est, a,
 95                                      &act_gact_ops, bind, true);
 96                 if (ret)
 97                         return ret;
 98                 ret = ACT_P_CREATED;
 99         } else {
100                 if (bind)/* dont override defaults */
101                         return 0;
102                 tcf_idr_release(*a, bind);
103                 if (!ovr)
104                         return -EEXIST;
105         }
106 
107         gact = to_gact(*a);
108 
109         ASSERT_RTNL();
110         gact->tcf_action = parm->action;
111 #ifdef CONFIG_GACT_PROB
112         if (p_parm) {
113                 gact->tcfg_paction = p_parm->paction;
114                 gact->tcfg_pval    = max_t(u16, 1, p_parm->pval);
115                 /* Make sure tcfg_pval is written before tcfg_ptype
116                  * coupled with smp_rmb() in gact_net_rand() & gact_determ()
117                  */
118                 smp_wmb();
119                 gact->tcfg_ptype   = p_parm->ptype;
120         }
121 #endif
122         if (ret == ACT_P_CREATED)
123                 tcf_idr_insert(tn, *a);
124         return ret;
125 }
126 
127 static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
128                     struct tcf_result *res)
129 {
130         struct tcf_gact *gact = to_gact(a);
131         int action = READ_ONCE(gact->tcf_action);
132 
133 #ifdef CONFIG_GACT_PROB
134         {
135         u32 ptype = READ_ONCE(gact->tcfg_ptype);
136 
137         if (ptype)
138                 action = gact_rand[ptype](gact);
139         }
140 #endif
141         bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
142         if (action == TC_ACT_SHOT)
143                 qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
144 
145         tcf_lastuse_update(&gact->tcf_tm);
146 
147         return action;
148 }
149 
150 static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
151                                   u64 lastuse)
152 {
153         struct tcf_gact *gact = to_gact(a);
154         int action = READ_ONCE(gact->tcf_action);
155         struct tcf_t *tm = &gact->tcf_tm;
156 
157         _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
158                            packets);
159         if (action == TC_ACT_SHOT)
160                 this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
161 
162         tm->lastuse = max_t(u64, tm->lastuse, lastuse);
163 }
164 
165 static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
166                          int bind, int ref)
167 {
168         unsigned char *b = skb_tail_pointer(skb);
169         struct tcf_gact *gact = to_gact(a);
170         struct tc_gact opt = {
171                 .index   = gact->tcf_index,
172                 .refcnt  = gact->tcf_refcnt - ref,
173                 .bindcnt = gact->tcf_bindcnt - bind,
174                 .action  = gact->tcf_action,
175         };
176         struct tcf_t t;
177 
178         if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
179                 goto nla_put_failure;
180 #ifdef CONFIG_GACT_PROB
181         if (gact->tcfg_ptype) {
182                 struct tc_gact_p p_opt = {
183                         .paction = gact->tcfg_paction,
184                         .pval    = gact->tcfg_pval,
185                         .ptype   = gact->tcfg_ptype,
186                 };
187 
188                 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
189                         goto nla_put_failure;
190         }
191 #endif
192         tcf_tm_dump(&t, &gact->tcf_tm);
193         if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
194                 goto nla_put_failure;
195         return skb->len;
196 
197 nla_put_failure:
198         nlmsg_trim(skb, b);
199         return -1;
200 }
201 
202 static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
203                            struct netlink_callback *cb, int type,
204                            const struct tc_action_ops *ops,
205                            struct netlink_ext_ack *extack)
206 {
207         struct tc_action_net *tn = net_generic(net, gact_net_id);
208 
209         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
210 }
211 
212 static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index,
213                            struct netlink_ext_ack *extack)
214 {
215         struct tc_action_net *tn = net_generic(net, gact_net_id);
216 
217         return tcf_idr_search(tn, a, index);
218 }
219 
220 static size_t tcf_gact_get_fill_size(const struct tc_action *act)
221 {
222         size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
223 
224 #ifdef CONFIG_GACT_PROB
225         if (to_gact(act)->tcfg_ptype)
226                 /* TCA_GACT_PROB */
227                 sz += nla_total_size(sizeof(struct tc_gact_p));
228 #endif
229 
230         return sz;
231 }
232 
233 static struct tc_action_ops act_gact_ops = {
234         .kind           =       "gact",
235         .type           =       TCA_ACT_GACT,
236         .owner          =       THIS_MODULE,
237         .act            =       tcf_gact,
238         .stats_update   =       tcf_gact_stats_update,
239         .dump           =       tcf_gact_dump,
240         .init           =       tcf_gact_init,
241         .walk           =       tcf_gact_walker,
242         .lookup         =       tcf_gact_search,
243         .get_fill_size  =       tcf_gact_get_fill_size,
244         .size           =       sizeof(struct tcf_gact),
245 };
246 
247 static __net_init int gact_init_net(struct net *net)
248 {
249         struct tc_action_net *tn = net_generic(net, gact_net_id);
250 
251         return tc_action_net_init(tn, &act_gact_ops);
252 }
253 
254 static void __net_exit gact_exit_net(struct list_head *net_list)
255 {
256         tc_action_net_exit(net_list, gact_net_id);
257 }
258 
259 static struct pernet_operations gact_net_ops = {
260         .init = gact_init_net,
261         .exit_batch = gact_exit_net,
262         .id   = &gact_net_id,
263         .size = sizeof(struct tc_action_net),
264 };
265 
266 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
267 MODULE_DESCRIPTION("Generic Classifier actions");
268 MODULE_LICENSE("GPL");
269 
270 static int __init gact_init_module(void)
271 {
272 #ifdef CONFIG_GACT_PROB
273         pr_info("GACT probability on\n");
274 #else
275         pr_info("GACT probability NOT on\n");
276 #endif
277 
278         return tcf_register_action(&act_gact_ops, &gact_net_ops);
279 }
280 
281 static void __exit gact_cleanup_module(void)
282 {
283         tcf_unregister_action(&act_gact_ops, &gact_net_ops);
284 }
285 
286 module_init(gact_init_module);
287 module_exit(gact_cleanup_module);
288 

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