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Linux/net/sched/act_gact.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net/sched/act_gact.c         Generic actions
  4  *
  5  * copyright    Jamal Hadi Salim (2002-4)
  6  */
  7 
  8 #include <linux/types.h>
  9 #include <linux/kernel.h>
 10 #include <linux/string.h>
 11 #include <linux/errno.h>
 12 #include <linux/skbuff.h>
 13 #include <linux/rtnetlink.h>
 14 #include <linux/module.h>
 15 #include <linux/init.h>
 16 #include <net/netlink.h>
 17 #include <net/pkt_sched.h>
 18 #include <net/pkt_cls.h>
 19 #include <linux/tc_act/tc_gact.h>
 20 #include <net/tc_act/tc_gact.h>
 21 
 22 static unsigned int gact_net_id;
 23 static struct tc_action_ops act_gact_ops;
 24 
 25 #ifdef CONFIG_GACT_PROB
 26 static int gact_net_rand(struct tcf_gact *gact)
 27 {
 28         smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 29         if (prandom_u32() % gact->tcfg_pval)
 30                 return gact->tcf_action;
 31         return gact->tcfg_paction;
 32 }
 33 
 34 static int gact_determ(struct tcf_gact *gact)
 35 {
 36         u32 pack = atomic_inc_return(&gact->packets);
 37 
 38         smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 39         if (pack % gact->tcfg_pval)
 40                 return gact->tcf_action;
 41         return gact->tcfg_paction;
 42 }
 43 
 44 typedef int (*g_rand)(struct tcf_gact *gact);
 45 static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
 46 #endif /* CONFIG_GACT_PROB */
 47 
 48 static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
 49         [TCA_GACT_PARMS]        = { .len = sizeof(struct tc_gact) },
 50         [TCA_GACT_PROB]         = { .len = sizeof(struct tc_gact_p) },
 51 };
 52 
 53 static int tcf_gact_init(struct net *net, struct nlattr *nla,
 54                          struct nlattr *est, struct tc_action **a,
 55                          int ovr, int bind, bool rtnl_held,
 56                          struct tcf_proto *tp, u32 flags,
 57                          struct netlink_ext_ack *extack)
 58 {
 59         struct tc_action_net *tn = net_generic(net, gact_net_id);
 60         struct nlattr *tb[TCA_GACT_MAX + 1];
 61         struct tcf_chain *goto_ch = NULL;
 62         struct tc_gact *parm;
 63         struct tcf_gact *gact;
 64         int ret = 0;
 65         u32 index;
 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_deprecated(tb, TCA_GACT_MAX, nla, gact_policy,
 75                                           NULL);
 76         if (err < 0)
 77                 return err;
 78 
 79         if (tb[TCA_GACT_PARMS] == NULL)
 80                 return -EINVAL;
 81         parm = nla_data(tb[TCA_GACT_PARMS]);
 82         index = parm->index;
 83 
 84 #ifndef CONFIG_GACT_PROB
 85         if (tb[TCA_GACT_PROB] != NULL)
 86                 return -EOPNOTSUPP;
 87 #else
 88         if (tb[TCA_GACT_PROB]) {
 89                 p_parm = nla_data(tb[TCA_GACT_PROB]);
 90                 if (p_parm->ptype >= MAX_RAND)
 91                         return -EINVAL;
 92                 if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
 93                         NL_SET_ERR_MSG(extack,
 94                                        "goto chain not allowed on fallback");
 95                         return -EINVAL;
 96                 }
 97         }
 98 #endif
 99 
100         err = tcf_idr_check_alloc(tn, &index, a, bind);
101         if (!err) {
102                 ret = tcf_idr_create_from_flags(tn, index, est, a,
103                                                 &act_gact_ops, bind, flags);
104                 if (ret) {
105                         tcf_idr_cleanup(tn, index);
106                         return ret;
107                 }
108                 ret = ACT_P_CREATED;
109         } else if (err > 0) {
110                 if (bind)/* dont override defaults */
111                         return 0;
112                 if (!ovr) {
113                         tcf_idr_release(*a, bind);
114                         return -EEXIST;
115                 }
116         } else {
117                 return err;
118         }
119 
120         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
121         if (err < 0)
122                 goto release_idr;
123         gact = to_gact(*a);
124 
125         spin_lock_bh(&gact->tcf_lock);
126         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
127 #ifdef CONFIG_GACT_PROB
128         if (p_parm) {
129                 gact->tcfg_paction = p_parm->paction;
130                 gact->tcfg_pval    = max_t(u16, 1, p_parm->pval);
131                 /* Make sure tcfg_pval is written before tcfg_ptype
132                  * coupled with smp_rmb() in gact_net_rand() & gact_determ()
133                  */
134                 smp_wmb();
135                 gact->tcfg_ptype   = p_parm->ptype;
136         }
137 #endif
138         spin_unlock_bh(&gact->tcf_lock);
139 
140         if (goto_ch)
141                 tcf_chain_put_by_act(goto_ch);
142 
143         if (ret == ACT_P_CREATED)
144                 tcf_idr_insert(tn, *a);
145         return ret;
146 release_idr:
147         tcf_idr_release(*a, bind);
148         return err;
149 }
150 
151 static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
152                         struct tcf_result *res)
153 {
154         struct tcf_gact *gact = to_gact(a);
155         int action = READ_ONCE(gact->tcf_action);
156 
157 #ifdef CONFIG_GACT_PROB
158         {
159         u32 ptype = READ_ONCE(gact->tcfg_ptype);
160 
161         if (ptype)
162                 action = gact_rand[ptype](gact);
163         }
164 #endif
165         tcf_action_update_bstats(&gact->common, skb);
166         if (action == TC_ACT_SHOT)
167                 tcf_action_inc_drop_qstats(&gact->common);
168 
169         tcf_lastuse_update(&gact->tcf_tm);
170 
171         return action;
172 }
173 
174 static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
175                                   u64 lastuse, bool hw)
176 {
177         struct tcf_gact *gact = to_gact(a);
178         int action = READ_ONCE(gact->tcf_action);
179         struct tcf_t *tm = &gact->tcf_tm;
180 
181         tcf_action_update_stats(a, bytes, packets, action == TC_ACT_SHOT, hw);
182         tm->lastuse = max_t(u64, tm->lastuse, lastuse);
183 }
184 
185 static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
186                          int bind, int ref)
187 {
188         unsigned char *b = skb_tail_pointer(skb);
189         struct tcf_gact *gact = to_gact(a);
190         struct tc_gact opt = {
191                 .index   = gact->tcf_index,
192                 .refcnt  = refcount_read(&gact->tcf_refcnt) - ref,
193                 .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
194         };
195         struct tcf_t t;
196 
197         spin_lock_bh(&gact->tcf_lock);
198         opt.action = gact->tcf_action;
199         if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
200                 goto nla_put_failure;
201 #ifdef CONFIG_GACT_PROB
202         if (gact->tcfg_ptype) {
203                 struct tc_gact_p p_opt = {
204                         .paction = gact->tcfg_paction,
205                         .pval    = gact->tcfg_pval,
206                         .ptype   = gact->tcfg_ptype,
207                 };
208 
209                 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
210                         goto nla_put_failure;
211         }
212 #endif
213         tcf_tm_dump(&t, &gact->tcf_tm);
214         if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
215                 goto nla_put_failure;
216         spin_unlock_bh(&gact->tcf_lock);
217 
218         return skb->len;
219 
220 nla_put_failure:
221         spin_unlock_bh(&gact->tcf_lock);
222         nlmsg_trim(skb, b);
223         return -1;
224 }
225 
226 static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
227                            struct netlink_callback *cb, int type,
228                            const struct tc_action_ops *ops,
229                            struct netlink_ext_ack *extack)
230 {
231         struct tc_action_net *tn = net_generic(net, gact_net_id);
232 
233         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
234 }
235 
236 static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
237 {
238         struct tc_action_net *tn = net_generic(net, gact_net_id);
239 
240         return tcf_idr_search(tn, a, index);
241 }
242 
243 static size_t tcf_gact_get_fill_size(const struct tc_action *act)
244 {
245         size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
246 
247 #ifdef CONFIG_GACT_PROB
248         if (to_gact(act)->tcfg_ptype)
249                 /* TCA_GACT_PROB */
250                 sz += nla_total_size(sizeof(struct tc_gact_p));
251 #endif
252 
253         return sz;
254 }
255 
256 static struct tc_action_ops act_gact_ops = {
257         .kind           =       "gact",
258         .id             =       TCA_ID_GACT,
259         .owner          =       THIS_MODULE,
260         .act            =       tcf_gact_act,
261         .stats_update   =       tcf_gact_stats_update,
262         .dump           =       tcf_gact_dump,
263         .init           =       tcf_gact_init,
264         .walk           =       tcf_gact_walker,
265         .lookup         =       tcf_gact_search,
266         .get_fill_size  =       tcf_gact_get_fill_size,
267         .size           =       sizeof(struct tcf_gact),
268 };
269 
270 static __net_init int gact_init_net(struct net *net)
271 {
272         struct tc_action_net *tn = net_generic(net, gact_net_id);
273 
274         return tc_action_net_init(net, tn, &act_gact_ops);
275 }
276 
277 static void __net_exit gact_exit_net(struct list_head *net_list)
278 {
279         tc_action_net_exit(net_list, gact_net_id);
280 }
281 
282 static struct pernet_operations gact_net_ops = {
283         .init = gact_init_net,
284         .exit_batch = gact_exit_net,
285         .id   = &gact_net_id,
286         .size = sizeof(struct tc_action_net),
287 };
288 
289 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
290 MODULE_DESCRIPTION("Generic Classifier actions");
291 MODULE_LICENSE("GPL");
292 
293 static int __init gact_init_module(void)
294 {
295 #ifdef CONFIG_GACT_PROB
296         pr_info("GACT probability on\n");
297 #else
298         pr_info("GACT probability NOT on\n");
299 #endif
300 
301         return tcf_register_action(&act_gact_ops, &gact_net_ops);
302 }
303 
304 static void __exit gact_cleanup_module(void)
305 {
306         tcf_unregister_action(&act_gact_ops, &gact_net_ops);
307 }
308 
309 module_init(gact_init_module);
310 module_exit(gact_cleanup_module);
311 

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