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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 <net/pkt_cls.h>
 24 #include <linux/tc_act/tc_gact.h>
 25 #include <net/tc_act/tc_gact.h>
 26 
 27 static unsigned int gact_net_id;
 28 static struct tc_action_ops act_gact_ops;
 29 
 30 #ifdef CONFIG_GACT_PROB
 31 static int gact_net_rand(struct tcf_gact *gact)
 32 {
 33         smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 34         if (prandom_u32() % gact->tcfg_pval)
 35                 return gact->tcf_action;
 36         return gact->tcfg_paction;
 37 }
 38 
 39 static int gact_determ(struct tcf_gact *gact)
 40 {
 41         u32 pack = atomic_inc_return(&gact->packets);
 42 
 43         smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 44         if (pack % gact->tcfg_pval)
 45                 return gact->tcf_action;
 46         return gact->tcfg_paction;
 47 }
 48 
 49 typedef int (*g_rand)(struct tcf_gact *gact);
 50 static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
 51 #endif /* CONFIG_GACT_PROB */
 52 
 53 static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
 54         [TCA_GACT_PARMS]        = { .len = sizeof(struct tc_gact) },
 55         [TCA_GACT_PROB]         = { .len = sizeof(struct tc_gact_p) },
 56 };
 57 
 58 static int tcf_gact_init(struct net *net, struct nlattr *nla,
 59                          struct nlattr *est, struct tc_action **a,
 60                          int ovr, int bind, bool rtnl_held,
 61                          struct tcf_proto *tp, struct netlink_ext_ack *extack)
 62 {
 63         struct tc_action_net *tn = net_generic(net, gact_net_id);
 64         struct nlattr *tb[TCA_GACT_MAX + 1];
 65         struct tcf_chain *goto_ch = NULL;
 66         struct tc_gact *parm;
 67         struct tcf_gact *gact;
 68         int ret = 0;
 69         int err;
 70 #ifdef CONFIG_GACT_PROB
 71         struct tc_gact_p *p_parm = NULL;
 72 #endif
 73 
 74         if (nla == NULL)
 75                 return -EINVAL;
 76 
 77         err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
 78         if (err < 0)
 79                 return err;
 80 
 81         if (tb[TCA_GACT_PARMS] == NULL)
 82                 return -EINVAL;
 83         parm = nla_data(tb[TCA_GACT_PARMS]);
 84 
 85 #ifndef CONFIG_GACT_PROB
 86         if (tb[TCA_GACT_PROB] != NULL)
 87                 return -EOPNOTSUPP;
 88 #else
 89         if (tb[TCA_GACT_PROB]) {
 90                 p_parm = nla_data(tb[TCA_GACT_PROB]);
 91                 if (p_parm->ptype >= MAX_RAND)
 92                         return -EINVAL;
 93                 if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
 94                         NL_SET_ERR_MSG(extack,
 95                                        "goto chain not allowed on fallback");
 96                         return -EINVAL;
 97                 }
 98         }
 99 #endif
100 
101         err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
102         if (!err) {
103                 ret = tcf_idr_create(tn, parm->index, est, a,
104                                      &act_gact_ops, bind, true);
105                 if (ret) {
106                         tcf_idr_cleanup(tn, parm->index);
107                         return ret;
108                 }
109                 ret = ACT_P_CREATED;
110         } else if (err > 0) {
111                 if (bind)/* dont override defaults */
112                         return 0;
113                 if (!ovr) {
114                         tcf_idr_release(*a, bind);
115                         return -EEXIST;
116                 }
117         } else {
118                 return err;
119         }
120 
121         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
122         if (err < 0)
123                 goto release_idr;
124         gact = to_gact(*a);
125 
126         spin_lock_bh(&gact->tcf_lock);
127         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
128 #ifdef CONFIG_GACT_PROB
129         if (p_parm) {
130                 gact->tcfg_paction = p_parm->paction;
131                 gact->tcfg_pval    = max_t(u16, 1, p_parm->pval);
132                 /* Make sure tcfg_pval is written before tcfg_ptype
133                  * coupled with smp_rmb() in gact_net_rand() & gact_determ()
134                  */
135                 smp_wmb();
136                 gact->tcfg_ptype   = p_parm->ptype;
137         }
138 #endif
139         spin_unlock_bh(&gact->tcf_lock);
140 
141         if (goto_ch)
142                 tcf_chain_put_by_act(goto_ch);
143 
144         if (ret == ACT_P_CREATED)
145                 tcf_idr_insert(tn, *a);
146         return ret;
147 release_idr:
148         tcf_idr_release(*a, bind);
149         return err;
150 }
151 
152 static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
153                         struct tcf_result *res)
154 {
155         struct tcf_gact *gact = to_gact(a);
156         int action = READ_ONCE(gact->tcf_action);
157 
158 #ifdef CONFIG_GACT_PROB
159         {
160         u32 ptype = READ_ONCE(gact->tcfg_ptype);
161 
162         if (ptype)
163                 action = gact_rand[ptype](gact);
164         }
165 #endif
166         bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
167         if (action == TC_ACT_SHOT)
168                 qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
169 
170         tcf_lastuse_update(&gact->tcf_tm);
171 
172         return action;
173 }
174 
175 static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
176                                   u64 lastuse, bool hw)
177 {
178         struct tcf_gact *gact = to_gact(a);
179         int action = READ_ONCE(gact->tcf_action);
180         struct tcf_t *tm = &gact->tcf_tm;
181 
182         _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
183                            packets);
184         if (action == TC_ACT_SHOT)
185                 this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
186 
187         if (hw)
188                 _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats_hw),
189                                    bytes, packets);
190 
191         tm->lastuse = max_t(u64, tm->lastuse, lastuse);
192 }
193 
194 static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
195                          int bind, int ref)
196 {
197         unsigned char *b = skb_tail_pointer(skb);
198         struct tcf_gact *gact = to_gact(a);
199         struct tc_gact opt = {
200                 .index   = gact->tcf_index,
201                 .refcnt  = refcount_read(&gact->tcf_refcnt) - ref,
202                 .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
203         };
204         struct tcf_t t;
205 
206         spin_lock_bh(&gact->tcf_lock);
207         opt.action = gact->tcf_action;
208         if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
209                 goto nla_put_failure;
210 #ifdef CONFIG_GACT_PROB
211         if (gact->tcfg_ptype) {
212                 struct tc_gact_p p_opt = {
213                         .paction = gact->tcfg_paction,
214                         .pval    = gact->tcfg_pval,
215                         .ptype   = gact->tcfg_ptype,
216                 };
217 
218                 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
219                         goto nla_put_failure;
220         }
221 #endif
222         tcf_tm_dump(&t, &gact->tcf_tm);
223         if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
224                 goto nla_put_failure;
225         spin_unlock_bh(&gact->tcf_lock);
226 
227         return skb->len;
228 
229 nla_put_failure:
230         spin_unlock_bh(&gact->tcf_lock);
231         nlmsg_trim(skb, b);
232         return -1;
233 }
234 
235 static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
236                            struct netlink_callback *cb, int type,
237                            const struct tc_action_ops *ops,
238                            struct netlink_ext_ack *extack)
239 {
240         struct tc_action_net *tn = net_generic(net, gact_net_id);
241 
242         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
243 }
244 
245 static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
246 {
247         struct tc_action_net *tn = net_generic(net, gact_net_id);
248 
249         return tcf_idr_search(tn, a, index);
250 }
251 
252 static size_t tcf_gact_get_fill_size(const struct tc_action *act)
253 {
254         size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
255 
256 #ifdef CONFIG_GACT_PROB
257         if (to_gact(act)->tcfg_ptype)
258                 /* TCA_GACT_PROB */
259                 sz += nla_total_size(sizeof(struct tc_gact_p));
260 #endif
261 
262         return sz;
263 }
264 
265 static struct tc_action_ops act_gact_ops = {
266         .kind           =       "gact",
267         .id             =       TCA_ID_GACT,
268         .owner          =       THIS_MODULE,
269         .act            =       tcf_gact_act,
270         .stats_update   =       tcf_gact_stats_update,
271         .dump           =       tcf_gact_dump,
272         .init           =       tcf_gact_init,
273         .walk           =       tcf_gact_walker,
274         .lookup         =       tcf_gact_search,
275         .get_fill_size  =       tcf_gact_get_fill_size,
276         .size           =       sizeof(struct tcf_gact),
277 };
278 
279 static __net_init int gact_init_net(struct net *net)
280 {
281         struct tc_action_net *tn = net_generic(net, gact_net_id);
282 
283         return tc_action_net_init(tn, &act_gact_ops);
284 }
285 
286 static void __net_exit gact_exit_net(struct list_head *net_list)
287 {
288         tc_action_net_exit(net_list, gact_net_id);
289 }
290 
291 static struct pernet_operations gact_net_ops = {
292         .init = gact_init_net,
293         .exit_batch = gact_exit_net,
294         .id   = &gact_net_id,
295         .size = sizeof(struct tc_action_net),
296 };
297 
298 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
299 MODULE_DESCRIPTION("Generic Classifier actions");
300 MODULE_LICENSE("GPL");
301 
302 static int __init gact_init_module(void)
303 {
304 #ifdef CONFIG_GACT_PROB
305         pr_info("GACT probability on\n");
306 #else
307         pr_info("GACT probability NOT on\n");
308 #endif
309 
310         return tcf_register_action(&act_gact_ops, &gact_net_ops);
311 }
312 
313 static void __exit gact_cleanup_module(void)
314 {
315         tcf_unregister_action(&act_gact_ops, &gact_net_ops);
316 }
317 
318 module_init(gact_init_module);
319 module_exit(gact_cleanup_module);
320 

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