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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * net/sched/act_api.c  Packet action API.
0004  *
0005  * Author:  Jamal Hadi Salim
0006  */
0007 
0008 #include <linux/types.h>
0009 #include <linux/kernel.h>
0010 #include <linux/string.h>
0011 #include <linux/errno.h>
0012 #include <linux/slab.h>
0013 #include <linux/skbuff.h>
0014 #include <linux/init.h>
0015 #include <linux/kmod.h>
0016 #include <linux/err.h>
0017 #include <linux/module.h>
0018 #include <net/net_namespace.h>
0019 #include <net/sock.h>
0020 #include <net/sch_generic.h>
0021 #include <net/pkt_cls.h>
0022 #include <net/tc_act/tc_pedit.h>
0023 #include <net/act_api.h>
0024 #include <net/netlink.h>
0025 #include <net/flow_offload.h>
0026 
0027 #ifdef CONFIG_INET
0028 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
0029 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
0030 #endif
0031 
0032 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
0033 {
0034 #ifdef CONFIG_INET
0035     if (static_branch_unlikely(&tcf_frag_xmit_count))
0036         return sch_frag_xmit_hook(skb, xmit);
0037 #endif
0038 
0039     return xmit(skb);
0040 }
0041 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
0042 
0043 static void tcf_action_goto_chain_exec(const struct tc_action *a,
0044                        struct tcf_result *res)
0045 {
0046     const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
0047 
0048     res->goto_tp = rcu_dereference_bh(chain->filter_chain);
0049 }
0050 
0051 static void tcf_free_cookie_rcu(struct rcu_head *p)
0052 {
0053     struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
0054 
0055     kfree(cookie->data);
0056     kfree(cookie);
0057 }
0058 
0059 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
0060                   struct tc_cookie *new_cookie)
0061 {
0062     struct tc_cookie *old;
0063 
0064     old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
0065     if (old)
0066         call_rcu(&old->rcu, tcf_free_cookie_rcu);
0067 }
0068 
0069 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
0070                  struct tcf_chain **newchain,
0071                  struct netlink_ext_ack *extack)
0072 {
0073     int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
0074     u32 chain_index;
0075 
0076     if (!opcode)
0077         ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
0078     else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
0079         ret = 0;
0080     if (ret) {
0081         NL_SET_ERR_MSG(extack, "invalid control action");
0082         goto end;
0083     }
0084 
0085     if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
0086         chain_index = action & TC_ACT_EXT_VAL_MASK;
0087         if (!tp || !newchain) {
0088             ret = -EINVAL;
0089             NL_SET_ERR_MSG(extack,
0090                        "can't goto NULL proto/chain");
0091             goto end;
0092         }
0093         *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
0094         if (!*newchain) {
0095             ret = -ENOMEM;
0096             NL_SET_ERR_MSG(extack,
0097                        "can't allocate goto_chain");
0098         }
0099     }
0100 end:
0101     return ret;
0102 }
0103 EXPORT_SYMBOL(tcf_action_check_ctrlact);
0104 
0105 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
0106                      struct tcf_chain *goto_chain)
0107 {
0108     a->tcfa_action = action;
0109     goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
0110     return goto_chain;
0111 }
0112 EXPORT_SYMBOL(tcf_action_set_ctrlact);
0113 
0114 /* XXX: For standalone actions, we don't need a RCU grace period either, because
0115  * actions are always connected to filters and filters are already destroyed in
0116  * RCU callbacks, so after a RCU grace period actions are already disconnected
0117  * from filters. Readers later can not find us.
0118  */
0119 static void free_tcf(struct tc_action *p)
0120 {
0121     struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
0122 
0123     free_percpu(p->cpu_bstats);
0124     free_percpu(p->cpu_bstats_hw);
0125     free_percpu(p->cpu_qstats);
0126 
0127     tcf_set_action_cookie(&p->act_cookie, NULL);
0128     if (chain)
0129         tcf_chain_put_by_act(chain);
0130 
0131     kfree(p);
0132 }
0133 
0134 static void offload_action_hw_count_set(struct tc_action *act,
0135                     u32 hw_count)
0136 {
0137     act->in_hw_count = hw_count;
0138 }
0139 
0140 static void offload_action_hw_count_inc(struct tc_action *act,
0141                     u32 hw_count)
0142 {
0143     act->in_hw_count += hw_count;
0144 }
0145 
0146 static void offload_action_hw_count_dec(struct tc_action *act,
0147                     u32 hw_count)
0148 {
0149     act->in_hw_count = act->in_hw_count > hw_count ?
0150                act->in_hw_count - hw_count : 0;
0151 }
0152 
0153 static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
0154 {
0155     if (is_tcf_pedit(act))
0156         return tcf_pedit_nkeys(act);
0157     else
0158         return 1;
0159 }
0160 
0161 static bool tc_act_skip_hw(u32 flags)
0162 {
0163     return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
0164 }
0165 
0166 static bool tc_act_skip_sw(u32 flags)
0167 {
0168     return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
0169 }
0170 
0171 static bool tc_act_in_hw(struct tc_action *act)
0172 {
0173     return !!act->in_hw_count;
0174 }
0175 
0176 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
0177 static bool tc_act_flags_valid(u32 flags)
0178 {
0179     flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
0180 
0181     return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
0182 }
0183 
0184 static int offload_action_init(struct flow_offload_action *fl_action,
0185                    struct tc_action *act,
0186                    enum offload_act_command  cmd,
0187                    struct netlink_ext_ack *extack)
0188 {
0189     int err;
0190 
0191     fl_action->extack = extack;
0192     fl_action->command = cmd;
0193     fl_action->index = act->tcfa_index;
0194 
0195     if (act->ops->offload_act_setup) {
0196         spin_lock_bh(&act->tcfa_lock);
0197         err = act->ops->offload_act_setup(act, fl_action, NULL,
0198                           false, extack);
0199         spin_unlock_bh(&act->tcfa_lock);
0200         return err;
0201     }
0202 
0203     return -EOPNOTSUPP;
0204 }
0205 
0206 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
0207                      u32 *hw_count)
0208 {
0209     int err;
0210 
0211     err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
0212                       fl_act, NULL, NULL);
0213     if (err < 0)
0214         return err;
0215 
0216     if (hw_count)
0217         *hw_count = err;
0218 
0219     return 0;
0220 }
0221 
0222 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
0223                     u32 *hw_count,
0224                     flow_indr_block_bind_cb_t *cb,
0225                     void *cb_priv)
0226 {
0227     int err;
0228 
0229     err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
0230     if (err < 0)
0231         return err;
0232 
0233     if (hw_count)
0234         *hw_count = 1;
0235 
0236     return 0;
0237 }
0238 
0239 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
0240                   u32 *hw_count,
0241                   flow_indr_block_bind_cb_t *cb,
0242                   void *cb_priv)
0243 {
0244     return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
0245                          cb, cb_priv) :
0246             tcf_action_offload_cmd_ex(fl_act, hw_count);
0247 }
0248 
0249 static int tcf_action_offload_add_ex(struct tc_action *action,
0250                      struct netlink_ext_ack *extack,
0251                      flow_indr_block_bind_cb_t *cb,
0252                      void *cb_priv)
0253 {
0254     bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
0255     struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
0256         [0] = action,
0257     };
0258     struct flow_offload_action *fl_action;
0259     u32 in_hw_count = 0;
0260     int num, err = 0;
0261 
0262     if (tc_act_skip_hw(action->tcfa_flags))
0263         return 0;
0264 
0265     num = tcf_offload_act_num_actions_single(action);
0266     fl_action = offload_action_alloc(num);
0267     if (!fl_action)
0268         return -ENOMEM;
0269 
0270     err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
0271     if (err)
0272         goto fl_err;
0273 
0274     err = tc_setup_action(&fl_action->action, actions, extack);
0275     if (err) {
0276         NL_SET_ERR_MSG_MOD(extack,
0277                    "Failed to setup tc actions for offload");
0278         goto fl_err;
0279     }
0280 
0281     err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
0282     if (!err)
0283         cb ? offload_action_hw_count_inc(action, in_hw_count) :
0284              offload_action_hw_count_set(action, in_hw_count);
0285 
0286     if (skip_sw && !tc_act_in_hw(action))
0287         err = -EINVAL;
0288 
0289     tc_cleanup_offload_action(&fl_action->action);
0290 
0291 fl_err:
0292     kfree(fl_action);
0293 
0294     return err;
0295 }
0296 
0297 /* offload the tc action after it is inserted */
0298 static int tcf_action_offload_add(struct tc_action *action,
0299                   struct netlink_ext_ack *extack)
0300 {
0301     return tcf_action_offload_add_ex(action, extack, NULL, NULL);
0302 }
0303 
0304 int tcf_action_update_hw_stats(struct tc_action *action)
0305 {
0306     struct flow_offload_action fl_act = {};
0307     int err;
0308 
0309     if (!tc_act_in_hw(action))
0310         return -EOPNOTSUPP;
0311 
0312     err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
0313     if (err)
0314         return err;
0315 
0316     err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
0317     if (!err) {
0318         preempt_disable();
0319         tcf_action_stats_update(action, fl_act.stats.bytes,
0320                     fl_act.stats.pkts,
0321                     fl_act.stats.drops,
0322                     fl_act.stats.lastused,
0323                     true);
0324         preempt_enable();
0325         action->used_hw_stats = fl_act.stats.used_hw_stats;
0326         action->used_hw_stats_valid = true;
0327     } else {
0328         return -EOPNOTSUPP;
0329     }
0330 
0331     return 0;
0332 }
0333 EXPORT_SYMBOL(tcf_action_update_hw_stats);
0334 
0335 static int tcf_action_offload_del_ex(struct tc_action *action,
0336                      flow_indr_block_bind_cb_t *cb,
0337                      void *cb_priv)
0338 {
0339     struct flow_offload_action fl_act = {};
0340     u32 in_hw_count = 0;
0341     int err = 0;
0342 
0343     if (!tc_act_in_hw(action))
0344         return 0;
0345 
0346     err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
0347     if (err)
0348         return err;
0349 
0350     err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
0351     if (err < 0)
0352         return err;
0353 
0354     if (!cb && action->in_hw_count != in_hw_count)
0355         return -EINVAL;
0356 
0357     /* do not need to update hw state when deleting action */
0358     if (cb && in_hw_count)
0359         offload_action_hw_count_dec(action, in_hw_count);
0360 
0361     return 0;
0362 }
0363 
0364 static int tcf_action_offload_del(struct tc_action *action)
0365 {
0366     return tcf_action_offload_del_ex(action, NULL, NULL);
0367 }
0368 
0369 static void tcf_action_cleanup(struct tc_action *p)
0370 {
0371     tcf_action_offload_del(p);
0372     if (p->ops->cleanup)
0373         p->ops->cleanup(p);
0374 
0375     gen_kill_estimator(&p->tcfa_rate_est);
0376     free_tcf(p);
0377 }
0378 
0379 static int __tcf_action_put(struct tc_action *p, bool bind)
0380 {
0381     struct tcf_idrinfo *idrinfo = p->idrinfo;
0382 
0383     if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
0384         if (bind)
0385             atomic_dec(&p->tcfa_bindcnt);
0386         idr_remove(&idrinfo->action_idr, p->tcfa_index);
0387         mutex_unlock(&idrinfo->lock);
0388 
0389         tcf_action_cleanup(p);
0390         return 1;
0391     }
0392 
0393     if (bind)
0394         atomic_dec(&p->tcfa_bindcnt);
0395 
0396     return 0;
0397 }
0398 
0399 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
0400 {
0401     int ret = 0;
0402 
0403     /* Release with strict==1 and bind==0 is only called through act API
0404      * interface (classifiers always bind). Only case when action with
0405      * positive reference count and zero bind count can exist is when it was
0406      * also created with act API (unbinding last classifier will destroy the
0407      * action if it was created by classifier). So only case when bind count
0408      * can be changed after initial check is when unbound action is
0409      * destroyed by act API while classifier binds to action with same id
0410      * concurrently. This result either creation of new action(same behavior
0411      * as before), or reusing existing action if concurrent process
0412      * increments reference count before action is deleted. Both scenarios
0413      * are acceptable.
0414      */
0415     if (p) {
0416         if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
0417             return -EPERM;
0418 
0419         if (__tcf_action_put(p, bind))
0420             ret = ACT_P_DELETED;
0421     }
0422 
0423     return ret;
0424 }
0425 
0426 int tcf_idr_release(struct tc_action *a, bool bind)
0427 {
0428     const struct tc_action_ops *ops = a->ops;
0429     int ret;
0430 
0431     ret = __tcf_idr_release(a, bind, false);
0432     if (ret == ACT_P_DELETED)
0433         module_put(ops->owner);
0434     return ret;
0435 }
0436 EXPORT_SYMBOL(tcf_idr_release);
0437 
0438 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
0439 {
0440     struct tc_cookie *act_cookie;
0441     u32 cookie_len = 0;
0442 
0443     rcu_read_lock();
0444     act_cookie = rcu_dereference(act->act_cookie);
0445 
0446     if (act_cookie)
0447         cookie_len = nla_total_size(act_cookie->len);
0448     rcu_read_unlock();
0449 
0450     return  nla_total_size(0) /* action number nested */
0451         + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
0452         + cookie_len /* TCA_ACT_COOKIE */
0453         + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
0454         + nla_total_size(0) /* TCA_ACT_STATS nested */
0455         + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
0456         /* TCA_STATS_BASIC */
0457         + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
0458         /* TCA_STATS_PKT64 */
0459         + nla_total_size_64bit(sizeof(u64))
0460         /* TCA_STATS_QUEUE */
0461         + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
0462         + nla_total_size(0) /* TCA_OPTIONS nested */
0463         + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
0464 }
0465 
0466 static size_t tcf_action_full_attrs_size(size_t sz)
0467 {
0468     return NLMSG_HDRLEN                     /* struct nlmsghdr */
0469         + sizeof(struct tcamsg)
0470         + nla_total_size(0)             /* TCA_ACT_TAB nested */
0471         + sz;
0472 }
0473 
0474 static size_t tcf_action_fill_size(const struct tc_action *act)
0475 {
0476     size_t sz = tcf_action_shared_attrs_size(act);
0477 
0478     if (act->ops->get_fill_size)
0479         return act->ops->get_fill_size(act) + sz;
0480     return sz;
0481 }
0482 
0483 static int
0484 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
0485 {
0486     unsigned char *b = skb_tail_pointer(skb);
0487     struct tc_cookie *cookie;
0488 
0489     if (nla_put_string(skb, TCA_KIND, a->ops->kind))
0490         goto nla_put_failure;
0491     if (tcf_action_copy_stats(skb, a, 0))
0492         goto nla_put_failure;
0493     if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
0494         goto nla_put_failure;
0495 
0496     rcu_read_lock();
0497     cookie = rcu_dereference(a->act_cookie);
0498     if (cookie) {
0499         if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
0500             rcu_read_unlock();
0501             goto nla_put_failure;
0502         }
0503     }
0504     rcu_read_unlock();
0505 
0506     return 0;
0507 
0508 nla_put_failure:
0509     nlmsg_trim(skb, b);
0510     return -1;
0511 }
0512 
0513 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
0514                struct netlink_callback *cb)
0515 {
0516     int err = 0, index = -1, s_i = 0, n_i = 0;
0517     u32 act_flags = cb->args[2];
0518     unsigned long jiffy_since = cb->args[3];
0519     struct nlattr *nest;
0520     struct idr *idr = &idrinfo->action_idr;
0521     struct tc_action *p;
0522     unsigned long id = 1;
0523     unsigned long tmp;
0524 
0525     mutex_lock(&idrinfo->lock);
0526 
0527     s_i = cb->args[0];
0528 
0529     idr_for_each_entry_ul(idr, p, tmp, id) {
0530         index++;
0531         if (index < s_i)
0532             continue;
0533         if (IS_ERR(p))
0534             continue;
0535 
0536         if (jiffy_since &&
0537             time_after(jiffy_since,
0538                    (unsigned long)p->tcfa_tm.lastuse))
0539             continue;
0540 
0541         nest = nla_nest_start_noflag(skb, n_i);
0542         if (!nest) {
0543             index--;
0544             goto nla_put_failure;
0545         }
0546         err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
0547             tcf_action_dump_terse(skb, p, true) :
0548             tcf_action_dump_1(skb, p, 0, 0);
0549         if (err < 0) {
0550             index--;
0551             nlmsg_trim(skb, nest);
0552             goto done;
0553         }
0554         nla_nest_end(skb, nest);
0555         n_i++;
0556         if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
0557             n_i >= TCA_ACT_MAX_PRIO)
0558             goto done;
0559     }
0560 done:
0561     if (index >= 0)
0562         cb->args[0] = index + 1;
0563 
0564     mutex_unlock(&idrinfo->lock);
0565     if (n_i) {
0566         if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
0567             cb->args[1] = n_i;
0568     }
0569     return n_i;
0570 
0571 nla_put_failure:
0572     nla_nest_cancel(skb, nest);
0573     goto done;
0574 }
0575 
0576 static int tcf_idr_release_unsafe(struct tc_action *p)
0577 {
0578     if (atomic_read(&p->tcfa_bindcnt) > 0)
0579         return -EPERM;
0580 
0581     if (refcount_dec_and_test(&p->tcfa_refcnt)) {
0582         idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
0583         tcf_action_cleanup(p);
0584         return ACT_P_DELETED;
0585     }
0586 
0587     return 0;
0588 }
0589 
0590 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
0591               const struct tc_action_ops *ops,
0592               struct netlink_ext_ack *extack)
0593 {
0594     struct nlattr *nest;
0595     int n_i = 0;
0596     int ret = -EINVAL;
0597     struct idr *idr = &idrinfo->action_idr;
0598     struct tc_action *p;
0599     unsigned long id = 1;
0600     unsigned long tmp;
0601 
0602     nest = nla_nest_start_noflag(skb, 0);
0603     if (nest == NULL)
0604         goto nla_put_failure;
0605     if (nla_put_string(skb, TCA_KIND, ops->kind))
0606         goto nla_put_failure;
0607 
0608     ret = 0;
0609     mutex_lock(&idrinfo->lock);
0610     idr_for_each_entry_ul(idr, p, tmp, id) {
0611         if (IS_ERR(p))
0612             continue;
0613         ret = tcf_idr_release_unsafe(p);
0614         if (ret == ACT_P_DELETED)
0615             module_put(ops->owner);
0616         else if (ret < 0)
0617             break;
0618         n_i++;
0619     }
0620     mutex_unlock(&idrinfo->lock);
0621     if (ret < 0) {
0622         if (n_i)
0623             NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
0624         else
0625             goto nla_put_failure;
0626     }
0627 
0628     ret = nla_put_u32(skb, TCA_FCNT, n_i);
0629     if (ret)
0630         goto nla_put_failure;
0631     nla_nest_end(skb, nest);
0632 
0633     return n_i;
0634 nla_put_failure:
0635     nla_nest_cancel(skb, nest);
0636     return ret;
0637 }
0638 
0639 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
0640                struct netlink_callback *cb, int type,
0641                const struct tc_action_ops *ops,
0642                struct netlink_ext_ack *extack)
0643 {
0644     struct tcf_idrinfo *idrinfo = tn->idrinfo;
0645 
0646     if (type == RTM_DELACTION) {
0647         return tcf_del_walker(idrinfo, skb, ops, extack);
0648     } else if (type == RTM_GETACTION) {
0649         return tcf_dump_walker(idrinfo, skb, cb);
0650     } else {
0651         WARN(1, "tcf_generic_walker: unknown command %d\n", type);
0652         NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
0653         return -EINVAL;
0654     }
0655 }
0656 EXPORT_SYMBOL(tcf_generic_walker);
0657 
0658 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
0659 {
0660     struct tcf_idrinfo *idrinfo = tn->idrinfo;
0661     struct tc_action *p;
0662 
0663     mutex_lock(&idrinfo->lock);
0664     p = idr_find(&idrinfo->action_idr, index);
0665     if (IS_ERR(p))
0666         p = NULL;
0667     else if (p)
0668         refcount_inc(&p->tcfa_refcnt);
0669     mutex_unlock(&idrinfo->lock);
0670 
0671     if (p) {
0672         *a = p;
0673         return true;
0674     }
0675     return false;
0676 }
0677 EXPORT_SYMBOL(tcf_idr_search);
0678 
0679 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
0680 {
0681     struct tc_action *p;
0682     int ret = 0;
0683 
0684     mutex_lock(&idrinfo->lock);
0685     p = idr_find(&idrinfo->action_idr, index);
0686     if (!p) {
0687         mutex_unlock(&idrinfo->lock);
0688         return -ENOENT;
0689     }
0690 
0691     if (!atomic_read(&p->tcfa_bindcnt)) {
0692         if (refcount_dec_and_test(&p->tcfa_refcnt)) {
0693             struct module *owner = p->ops->owner;
0694 
0695             WARN_ON(p != idr_remove(&idrinfo->action_idr,
0696                         p->tcfa_index));
0697             mutex_unlock(&idrinfo->lock);
0698 
0699             tcf_action_cleanup(p);
0700             module_put(owner);
0701             return 0;
0702         }
0703         ret = 0;
0704     } else {
0705         ret = -EPERM;
0706     }
0707 
0708     mutex_unlock(&idrinfo->lock);
0709     return ret;
0710 }
0711 
0712 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
0713            struct tc_action **a, const struct tc_action_ops *ops,
0714            int bind, bool cpustats, u32 flags)
0715 {
0716     struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
0717     struct tcf_idrinfo *idrinfo = tn->idrinfo;
0718     int err = -ENOMEM;
0719 
0720     if (unlikely(!p))
0721         return -ENOMEM;
0722     refcount_set(&p->tcfa_refcnt, 1);
0723     if (bind)
0724         atomic_set(&p->tcfa_bindcnt, 1);
0725 
0726     if (cpustats) {
0727         p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
0728         if (!p->cpu_bstats)
0729             goto err1;
0730         p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
0731         if (!p->cpu_bstats_hw)
0732             goto err2;
0733         p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
0734         if (!p->cpu_qstats)
0735             goto err3;
0736     }
0737     gnet_stats_basic_sync_init(&p->tcfa_bstats);
0738     gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
0739     spin_lock_init(&p->tcfa_lock);
0740     p->tcfa_index = index;
0741     p->tcfa_tm.install = jiffies;
0742     p->tcfa_tm.lastuse = jiffies;
0743     p->tcfa_tm.firstuse = 0;
0744     p->tcfa_flags = flags;
0745     if (est) {
0746         err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
0747                     &p->tcfa_rate_est,
0748                     &p->tcfa_lock, false, est);
0749         if (err)
0750             goto err4;
0751     }
0752 
0753     p->idrinfo = idrinfo;
0754     __module_get(ops->owner);
0755     p->ops = ops;
0756     *a = p;
0757     return 0;
0758 err4:
0759     free_percpu(p->cpu_qstats);
0760 err3:
0761     free_percpu(p->cpu_bstats_hw);
0762 err2:
0763     free_percpu(p->cpu_bstats);
0764 err1:
0765     kfree(p);
0766     return err;
0767 }
0768 EXPORT_SYMBOL(tcf_idr_create);
0769 
0770 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
0771                   struct nlattr *est, struct tc_action **a,
0772                   const struct tc_action_ops *ops, int bind,
0773                   u32 flags)
0774 {
0775     /* Set cpustats according to actions flags. */
0776     return tcf_idr_create(tn, index, est, a, ops, bind,
0777                   !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
0778 }
0779 EXPORT_SYMBOL(tcf_idr_create_from_flags);
0780 
0781 /* Cleanup idr index that was allocated but not initialized. */
0782 
0783 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
0784 {
0785     struct tcf_idrinfo *idrinfo = tn->idrinfo;
0786 
0787     mutex_lock(&idrinfo->lock);
0788     /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
0789     WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
0790     mutex_unlock(&idrinfo->lock);
0791 }
0792 EXPORT_SYMBOL(tcf_idr_cleanup);
0793 
0794 /* Check if action with specified index exists. If actions is found, increments
0795  * its reference and bind counters, and return 1. Otherwise insert temporary
0796  * error pointer (to prevent concurrent users from inserting actions with same
0797  * index) and return 0.
0798  */
0799 
0800 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
0801             struct tc_action **a, int bind)
0802 {
0803     struct tcf_idrinfo *idrinfo = tn->idrinfo;
0804     struct tc_action *p;
0805     int ret;
0806 
0807 again:
0808     mutex_lock(&idrinfo->lock);
0809     if (*index) {
0810         p = idr_find(&idrinfo->action_idr, *index);
0811         if (IS_ERR(p)) {
0812             /* This means that another process allocated
0813              * index but did not assign the pointer yet.
0814              */
0815             mutex_unlock(&idrinfo->lock);
0816             goto again;
0817         }
0818 
0819         if (p) {
0820             refcount_inc(&p->tcfa_refcnt);
0821             if (bind)
0822                 atomic_inc(&p->tcfa_bindcnt);
0823             *a = p;
0824             ret = 1;
0825         } else {
0826             *a = NULL;
0827             ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
0828                         *index, GFP_KERNEL);
0829             if (!ret)
0830                 idr_replace(&idrinfo->action_idr,
0831                         ERR_PTR(-EBUSY), *index);
0832         }
0833     } else {
0834         *index = 1;
0835         *a = NULL;
0836         ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
0837                     UINT_MAX, GFP_KERNEL);
0838         if (!ret)
0839             idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
0840                     *index);
0841     }
0842     mutex_unlock(&idrinfo->lock);
0843     return ret;
0844 }
0845 EXPORT_SYMBOL(tcf_idr_check_alloc);
0846 
0847 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
0848              struct tcf_idrinfo *idrinfo)
0849 {
0850     struct idr *idr = &idrinfo->action_idr;
0851     struct tc_action *p;
0852     int ret;
0853     unsigned long id = 1;
0854     unsigned long tmp;
0855 
0856     idr_for_each_entry_ul(idr, p, tmp, id) {
0857         ret = __tcf_idr_release(p, false, true);
0858         if (ret == ACT_P_DELETED)
0859             module_put(ops->owner);
0860         else if (ret < 0)
0861             return;
0862     }
0863     idr_destroy(&idrinfo->action_idr);
0864 }
0865 EXPORT_SYMBOL(tcf_idrinfo_destroy);
0866 
0867 static LIST_HEAD(act_base);
0868 static DEFINE_RWLOCK(act_mod_lock);
0869 /* since act ops id is stored in pernet subsystem list,
0870  * then there is no way to walk through only all the action
0871  * subsystem, so we keep tc action pernet ops id for
0872  * reoffload to walk through.
0873  */
0874 static LIST_HEAD(act_pernet_id_list);
0875 static DEFINE_MUTEX(act_id_mutex);
0876 struct tc_act_pernet_id {
0877     struct list_head list;
0878     unsigned int id;
0879 };
0880 
0881 static int tcf_pernet_add_id_list(unsigned int id)
0882 {
0883     struct tc_act_pernet_id *id_ptr;
0884     int ret = 0;
0885 
0886     mutex_lock(&act_id_mutex);
0887     list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
0888         if (id_ptr->id == id) {
0889             ret = -EEXIST;
0890             goto err_out;
0891         }
0892     }
0893 
0894     id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
0895     if (!id_ptr) {
0896         ret = -ENOMEM;
0897         goto err_out;
0898     }
0899     id_ptr->id = id;
0900 
0901     list_add_tail(&id_ptr->list, &act_pernet_id_list);
0902 
0903 err_out:
0904     mutex_unlock(&act_id_mutex);
0905     return ret;
0906 }
0907 
0908 static void tcf_pernet_del_id_list(unsigned int id)
0909 {
0910     struct tc_act_pernet_id *id_ptr;
0911 
0912     mutex_lock(&act_id_mutex);
0913     list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
0914         if (id_ptr->id == id) {
0915             list_del(&id_ptr->list);
0916             kfree(id_ptr);
0917             break;
0918         }
0919     }
0920     mutex_unlock(&act_id_mutex);
0921 }
0922 
0923 int tcf_register_action(struct tc_action_ops *act,
0924             struct pernet_operations *ops)
0925 {
0926     struct tc_action_ops *a;
0927     int ret;
0928 
0929     if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
0930         return -EINVAL;
0931 
0932     /* We have to register pernet ops before making the action ops visible,
0933      * otherwise tcf_action_init_1() could get a partially initialized
0934      * netns.
0935      */
0936     ret = register_pernet_subsys(ops);
0937     if (ret)
0938         return ret;
0939 
0940     if (ops->id) {
0941         ret = tcf_pernet_add_id_list(*ops->id);
0942         if (ret)
0943             goto err_id;
0944     }
0945 
0946     write_lock(&act_mod_lock);
0947     list_for_each_entry(a, &act_base, head) {
0948         if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
0949             ret = -EEXIST;
0950             goto err_out;
0951         }
0952     }
0953     list_add_tail(&act->head, &act_base);
0954     write_unlock(&act_mod_lock);
0955 
0956     return 0;
0957 
0958 err_out:
0959     write_unlock(&act_mod_lock);
0960     if (ops->id)
0961         tcf_pernet_del_id_list(*ops->id);
0962 err_id:
0963     unregister_pernet_subsys(ops);
0964     return ret;
0965 }
0966 EXPORT_SYMBOL(tcf_register_action);
0967 
0968 int tcf_unregister_action(struct tc_action_ops *act,
0969               struct pernet_operations *ops)
0970 {
0971     struct tc_action_ops *a;
0972     int err = -ENOENT;
0973 
0974     write_lock(&act_mod_lock);
0975     list_for_each_entry(a, &act_base, head) {
0976         if (a == act) {
0977             list_del(&act->head);
0978             err = 0;
0979             break;
0980         }
0981     }
0982     write_unlock(&act_mod_lock);
0983     if (!err) {
0984         unregister_pernet_subsys(ops);
0985         if (ops->id)
0986             tcf_pernet_del_id_list(*ops->id);
0987     }
0988     return err;
0989 }
0990 EXPORT_SYMBOL(tcf_unregister_action);
0991 
0992 /* lookup by name */
0993 static struct tc_action_ops *tc_lookup_action_n(char *kind)
0994 {
0995     struct tc_action_ops *a, *res = NULL;
0996 
0997     if (kind) {
0998         read_lock(&act_mod_lock);
0999         list_for_each_entry(a, &act_base, head) {
1000             if (strcmp(kind, a->kind) == 0) {
1001                 if (try_module_get(a->owner))
1002                     res = a;
1003                 break;
1004             }
1005         }
1006         read_unlock(&act_mod_lock);
1007     }
1008     return res;
1009 }
1010 
1011 /* lookup by nlattr */
1012 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1013 {
1014     struct tc_action_ops *a, *res = NULL;
1015 
1016     if (kind) {
1017         read_lock(&act_mod_lock);
1018         list_for_each_entry(a, &act_base, head) {
1019             if (nla_strcmp(kind, a->kind) == 0) {
1020                 if (try_module_get(a->owner))
1021                     res = a;
1022                 break;
1023             }
1024         }
1025         read_unlock(&act_mod_lock);
1026     }
1027     return res;
1028 }
1029 
1030 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1031 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
1032 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1033             int nr_actions, struct tcf_result *res)
1034 {
1035     u32 jmp_prgcnt = 0;
1036     u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1037     int i;
1038     int ret = TC_ACT_OK;
1039 
1040     if (skb_skip_tc_classify(skb))
1041         return TC_ACT_OK;
1042 
1043 restart_act_graph:
1044     for (i = 0; i < nr_actions; i++) {
1045         const struct tc_action *a = actions[i];
1046         int repeat_ttl;
1047 
1048         if (jmp_prgcnt > 0) {
1049             jmp_prgcnt -= 1;
1050             continue;
1051         }
1052 
1053         if (tc_act_skip_sw(a->tcfa_flags))
1054             continue;
1055 
1056         repeat_ttl = 32;
1057 repeat:
1058         ret = a->ops->act(skb, a, res);
1059         if (unlikely(ret == TC_ACT_REPEAT)) {
1060             if (--repeat_ttl != 0)
1061                 goto repeat;
1062             /* suspicious opcode, stop pipeline */
1063             net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1064             return TC_ACT_OK;
1065         }
1066         if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1067             jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1068             if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1069                 /* faulty opcode, stop pipeline */
1070                 return TC_ACT_OK;
1071             } else {
1072                 jmp_ttl -= 1;
1073                 if (jmp_ttl > 0)
1074                     goto restart_act_graph;
1075                 else /* faulty graph, stop pipeline */
1076                     return TC_ACT_OK;
1077             }
1078         } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1079             if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1080                 net_warn_ratelimited("can't go to NULL chain!\n");
1081                 return TC_ACT_SHOT;
1082             }
1083             tcf_action_goto_chain_exec(a, res);
1084         }
1085 
1086         if (ret != TC_ACT_PIPE)
1087             break;
1088     }
1089 
1090     return ret;
1091 }
1092 EXPORT_SYMBOL(tcf_action_exec);
1093 
1094 int tcf_action_destroy(struct tc_action *actions[], int bind)
1095 {
1096     const struct tc_action_ops *ops;
1097     struct tc_action *a;
1098     int ret = 0, i;
1099 
1100     for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1101         a = actions[i];
1102         actions[i] = NULL;
1103         ops = a->ops;
1104         ret = __tcf_idr_release(a, bind, true);
1105         if (ret == ACT_P_DELETED)
1106             module_put(ops->owner);
1107         else if (ret < 0)
1108             return ret;
1109     }
1110     return ret;
1111 }
1112 
1113 static int tcf_action_put(struct tc_action *p)
1114 {
1115     return __tcf_action_put(p, false);
1116 }
1117 
1118 /* Put all actions in this array, skip those NULL's. */
1119 static void tcf_action_put_many(struct tc_action *actions[])
1120 {
1121     int i;
1122 
1123     for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1124         struct tc_action *a = actions[i];
1125         const struct tc_action_ops *ops;
1126 
1127         if (!a)
1128             continue;
1129         ops = a->ops;
1130         if (tcf_action_put(a))
1131             module_put(ops->owner);
1132     }
1133 }
1134 
1135 int
1136 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1137 {
1138     return a->ops->dump(skb, a, bind, ref);
1139 }
1140 
1141 int
1142 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1143 {
1144     int err = -EINVAL;
1145     unsigned char *b = skb_tail_pointer(skb);
1146     struct nlattr *nest;
1147     u32 flags;
1148 
1149     if (tcf_action_dump_terse(skb, a, false))
1150         goto nla_put_failure;
1151 
1152     if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1153         nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1154                    a->hw_stats, TCA_ACT_HW_STATS_ANY))
1155         goto nla_put_failure;
1156 
1157     if (a->used_hw_stats_valid &&
1158         nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1159                    a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1160         goto nla_put_failure;
1161 
1162     flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1163     if (flags &&
1164         nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1165                    flags, flags))
1166         goto nla_put_failure;
1167 
1168     if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1169         goto nla_put_failure;
1170 
1171     nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1172     if (nest == NULL)
1173         goto nla_put_failure;
1174     err = tcf_action_dump_old(skb, a, bind, ref);
1175     if (err > 0) {
1176         nla_nest_end(skb, nest);
1177         return err;
1178     }
1179 
1180 nla_put_failure:
1181     nlmsg_trim(skb, b);
1182     return -1;
1183 }
1184 EXPORT_SYMBOL(tcf_action_dump_1);
1185 
1186 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1187             int bind, int ref, bool terse)
1188 {
1189     struct tc_action *a;
1190     int err = -EINVAL, i;
1191     struct nlattr *nest;
1192 
1193     for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1194         a = actions[i];
1195         nest = nla_nest_start_noflag(skb, i + 1);
1196         if (nest == NULL)
1197             goto nla_put_failure;
1198         err = terse ? tcf_action_dump_terse(skb, a, false) :
1199             tcf_action_dump_1(skb, a, bind, ref);
1200         if (err < 0)
1201             goto errout;
1202         nla_nest_end(skb, nest);
1203     }
1204 
1205     return 0;
1206 
1207 nla_put_failure:
1208     err = -EINVAL;
1209 errout:
1210     nla_nest_cancel(skb, nest);
1211     return err;
1212 }
1213 
1214 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1215 {
1216     struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1217     if (!c)
1218         return NULL;
1219 
1220     c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1221     if (!c->data) {
1222         kfree(c);
1223         return NULL;
1224     }
1225     c->len = nla_len(tb[TCA_ACT_COOKIE]);
1226 
1227     return c;
1228 }
1229 
1230 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1231 {
1232     struct nla_bitfield32 hw_stats_bf;
1233 
1234     /* If the user did not pass the attr, that means he does
1235      * not care about the type. Return "any" in that case
1236      * which is setting on all supported types.
1237      */
1238     if (!hw_stats_attr)
1239         return TCA_ACT_HW_STATS_ANY;
1240     hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1241     return hw_stats_bf.value;
1242 }
1243 
1244 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1245     [TCA_ACT_KIND]      = { .type = NLA_STRING },
1246     [TCA_ACT_INDEX]     = { .type = NLA_U32 },
1247     [TCA_ACT_COOKIE]    = { .type = NLA_BINARY,
1248                     .len = TC_COOKIE_MAX_SIZE },
1249     [TCA_ACT_OPTIONS]   = { .type = NLA_NESTED },
1250     [TCA_ACT_FLAGS]     = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1251                             TCA_ACT_FLAGS_SKIP_HW |
1252                             TCA_ACT_FLAGS_SKIP_SW),
1253     [TCA_ACT_HW_STATS]  = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1254 };
1255 
1256 void tcf_idr_insert_many(struct tc_action *actions[])
1257 {
1258     int i;
1259 
1260     for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1261         struct tc_action *a = actions[i];
1262         struct tcf_idrinfo *idrinfo;
1263 
1264         if (!a)
1265             continue;
1266         idrinfo = a->idrinfo;
1267         mutex_lock(&idrinfo->lock);
1268         /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
1269          * it is just created, otherwise this is just a nop.
1270          */
1271         idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1272         mutex_unlock(&idrinfo->lock);
1273     }
1274 }
1275 
1276 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
1277                      bool rtnl_held,
1278                      struct netlink_ext_ack *extack)
1279 {
1280     struct nlattr *tb[TCA_ACT_MAX + 1];
1281     struct tc_action_ops *a_o;
1282     char act_name[IFNAMSIZ];
1283     struct nlattr *kind;
1284     int err;
1285 
1286     if (!police) {
1287         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1288                           tcf_action_policy, extack);
1289         if (err < 0)
1290             return ERR_PTR(err);
1291         err = -EINVAL;
1292         kind = tb[TCA_ACT_KIND];
1293         if (!kind) {
1294             NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1295             return ERR_PTR(err);
1296         }
1297         if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1298             NL_SET_ERR_MSG(extack, "TC action name too long");
1299             return ERR_PTR(err);
1300         }
1301     } else {
1302         if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) {
1303             NL_SET_ERR_MSG(extack, "TC action name too long");
1304             return ERR_PTR(-EINVAL);
1305         }
1306     }
1307 
1308     a_o = tc_lookup_action_n(act_name);
1309     if (a_o == NULL) {
1310 #ifdef CONFIG_MODULES
1311         if (rtnl_held)
1312             rtnl_unlock();
1313         request_module("act_%s", act_name);
1314         if (rtnl_held)
1315             rtnl_lock();
1316 
1317         a_o = tc_lookup_action_n(act_name);
1318 
1319         /* We dropped the RTNL semaphore in order to
1320          * perform the module load.  So, even if we
1321          * succeeded in loading the module we have to
1322          * tell the caller to replay the request.  We
1323          * indicate this using -EAGAIN.
1324          */
1325         if (a_o != NULL) {
1326             module_put(a_o->owner);
1327             return ERR_PTR(-EAGAIN);
1328         }
1329 #endif
1330         NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1331         return ERR_PTR(-ENOENT);
1332     }
1333 
1334     return a_o;
1335 }
1336 
1337 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1338                     struct nlattr *nla, struct nlattr *est,
1339                     struct tc_action_ops *a_o, int *init_res,
1340                     u32 flags, struct netlink_ext_ack *extack)
1341 {
1342     bool police = flags & TCA_ACT_FLAGS_POLICE;
1343     struct nla_bitfield32 userflags = { 0, 0 };
1344     u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1345     struct nlattr *tb[TCA_ACT_MAX + 1];
1346     struct tc_cookie *cookie = NULL;
1347     struct tc_action *a;
1348     int err;
1349 
1350     /* backward compatibility for policer */
1351     if (!police) {
1352         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1353                           tcf_action_policy, extack);
1354         if (err < 0)
1355             return ERR_PTR(err);
1356         if (tb[TCA_ACT_COOKIE]) {
1357             cookie = nla_memdup_cookie(tb);
1358             if (!cookie) {
1359                 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1360                 err = -ENOMEM;
1361                 goto err_out;
1362             }
1363         }
1364         hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1365         if (tb[TCA_ACT_FLAGS]) {
1366             userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1367             if (!tc_act_flags_valid(userflags.value)) {
1368                 err = -EINVAL;
1369                 goto err_out;
1370             }
1371         }
1372 
1373         err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1374                 userflags.value | flags, extack);
1375     } else {
1376         err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1377                 extack);
1378     }
1379     if (err < 0)
1380         goto err_out;
1381     *init_res = err;
1382 
1383     if (!police && tb[TCA_ACT_COOKIE])
1384         tcf_set_action_cookie(&a->act_cookie, cookie);
1385 
1386     if (!police)
1387         a->hw_stats = hw_stats;
1388 
1389     return a;
1390 
1391 err_out:
1392     if (cookie) {
1393         kfree(cookie->data);
1394         kfree(cookie);
1395     }
1396     return ERR_PTR(err);
1397 }
1398 
1399 static bool tc_act_bind(u32 flags)
1400 {
1401     return !!(flags & TCA_ACT_FLAGS_BIND);
1402 }
1403 
1404 /* Returns numbers of initialized actions or negative error. */
1405 
1406 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1407             struct nlattr *est, struct tc_action *actions[],
1408             int init_res[], size_t *attr_size,
1409             u32 flags, u32 fl_flags,
1410             struct netlink_ext_ack *extack)
1411 {
1412     struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1413     struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1414     struct tc_action *act;
1415     size_t sz = 0;
1416     int err;
1417     int i;
1418 
1419     err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1420                       extack);
1421     if (err < 0)
1422         return err;
1423 
1424     for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1425         struct tc_action_ops *a_o;
1426 
1427         a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE,
1428                      !(flags & TCA_ACT_FLAGS_NO_RTNL),
1429                      extack);
1430         if (IS_ERR(a_o)) {
1431             err = PTR_ERR(a_o);
1432             goto err_mod;
1433         }
1434         ops[i - 1] = a_o;
1435     }
1436 
1437     for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1438         act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1439                     &init_res[i - 1], flags, extack);
1440         if (IS_ERR(act)) {
1441             err = PTR_ERR(act);
1442             goto err;
1443         }
1444         sz += tcf_action_fill_size(act);
1445         /* Start from index 0 */
1446         actions[i - 1] = act;
1447         if (tc_act_bind(flags)) {
1448             bool skip_sw = tc_skip_sw(fl_flags);
1449             bool skip_hw = tc_skip_hw(fl_flags);
1450 
1451             if (tc_act_bind(act->tcfa_flags))
1452                 continue;
1453             if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1454                 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1455                 NL_SET_ERR_MSG(extack,
1456                            "Mismatch between action and filter offload flags");
1457                 err = -EINVAL;
1458                 goto err;
1459             }
1460         } else {
1461             err = tcf_action_offload_add(act, extack);
1462             if (tc_act_skip_sw(act->tcfa_flags) && err)
1463                 goto err;
1464         }
1465     }
1466 
1467     /* We have to commit them all together, because if any error happened in
1468      * between, we could not handle the failure gracefully.
1469      */
1470     tcf_idr_insert_many(actions);
1471 
1472     *attr_size = tcf_action_full_attrs_size(sz);
1473     err = i - 1;
1474     goto err_mod;
1475 
1476 err:
1477     tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1478 err_mod:
1479     for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1480         if (ops[i])
1481             module_put(ops[i]->owner);
1482     }
1483     return err;
1484 }
1485 
1486 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1487                  u64 drops, bool hw)
1488 {
1489     if (a->cpu_bstats) {
1490         _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1491 
1492         this_cpu_ptr(a->cpu_qstats)->drops += drops;
1493 
1494         if (hw)
1495             _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1496                        bytes, packets);
1497         return;
1498     }
1499 
1500     _bstats_update(&a->tcfa_bstats, bytes, packets);
1501     a->tcfa_qstats.drops += drops;
1502     if (hw)
1503         _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1504 }
1505 EXPORT_SYMBOL(tcf_action_update_stats);
1506 
1507 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1508               int compat_mode)
1509 {
1510     int err = 0;
1511     struct gnet_dump d;
1512 
1513     if (p == NULL)
1514         goto errout;
1515 
1516     /* update hw stats for this action */
1517     tcf_action_update_hw_stats(p);
1518 
1519     /* compat_mode being true specifies a call that is supposed
1520      * to add additional backward compatibility statistic TLVs.
1521      */
1522     if (compat_mode) {
1523         if (p->type == TCA_OLD_COMPAT)
1524             err = gnet_stats_start_copy_compat(skb, 0,
1525                                TCA_STATS,
1526                                TCA_XSTATS,
1527                                &p->tcfa_lock, &d,
1528                                TCA_PAD);
1529         else
1530             return 0;
1531     } else
1532         err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1533                         &p->tcfa_lock, &d, TCA_ACT_PAD);
1534 
1535     if (err < 0)
1536         goto errout;
1537 
1538     if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1539                   &p->tcfa_bstats, false) < 0 ||
1540         gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1541                      &p->tcfa_bstats_hw, false) < 0 ||
1542         gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1543         gnet_stats_copy_queue(&d, p->cpu_qstats,
1544                   &p->tcfa_qstats,
1545                   p->tcfa_qstats.qlen) < 0)
1546         goto errout;
1547 
1548     if (gnet_stats_finish_copy(&d) < 0)
1549         goto errout;
1550 
1551     return 0;
1552 
1553 errout:
1554     return -1;
1555 }
1556 
1557 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1558             u32 portid, u32 seq, u16 flags, int event, int bind,
1559             int ref)
1560 {
1561     struct tcamsg *t;
1562     struct nlmsghdr *nlh;
1563     unsigned char *b = skb_tail_pointer(skb);
1564     struct nlattr *nest;
1565 
1566     nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1567     if (!nlh)
1568         goto out_nlmsg_trim;
1569     t = nlmsg_data(nlh);
1570     t->tca_family = AF_UNSPEC;
1571     t->tca__pad1 = 0;
1572     t->tca__pad2 = 0;
1573 
1574     nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1575     if (!nest)
1576         goto out_nlmsg_trim;
1577 
1578     if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1579         goto out_nlmsg_trim;
1580 
1581     nla_nest_end(skb, nest);
1582 
1583     nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1584     return skb->len;
1585 
1586 out_nlmsg_trim:
1587     nlmsg_trim(skb, b);
1588     return -1;
1589 }
1590 
1591 static int
1592 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1593            struct tc_action *actions[], int event,
1594            struct netlink_ext_ack *extack)
1595 {
1596     struct sk_buff *skb;
1597 
1598     skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1599     if (!skb)
1600         return -ENOBUFS;
1601     if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1602              0, 1) <= 0) {
1603         NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1604         kfree_skb(skb);
1605         return -EINVAL;
1606     }
1607 
1608     return rtnl_unicast(skb, net, portid);
1609 }
1610 
1611 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1612                       struct nlmsghdr *n, u32 portid,
1613                       struct netlink_ext_ack *extack)
1614 {
1615     struct nlattr *tb[TCA_ACT_MAX + 1];
1616     const struct tc_action_ops *ops;
1617     struct tc_action *a;
1618     int index;
1619     int err;
1620 
1621     err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1622                       tcf_action_policy, extack);
1623     if (err < 0)
1624         goto err_out;
1625 
1626     err = -EINVAL;
1627     if (tb[TCA_ACT_INDEX] == NULL ||
1628         nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1629         NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1630         goto err_out;
1631     }
1632     index = nla_get_u32(tb[TCA_ACT_INDEX]);
1633 
1634     err = -EINVAL;
1635     ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1636     if (!ops) { /* could happen in batch of actions */
1637         NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1638         goto err_out;
1639     }
1640     err = -ENOENT;
1641     if (ops->lookup(net, &a, index) == 0) {
1642         NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1643         goto err_mod;
1644     }
1645 
1646     module_put(ops->owner);
1647     return a;
1648 
1649 err_mod:
1650     module_put(ops->owner);
1651 err_out:
1652     return ERR_PTR(err);
1653 }
1654 
1655 static int tca_action_flush(struct net *net, struct nlattr *nla,
1656                 struct nlmsghdr *n, u32 portid,
1657                 struct netlink_ext_ack *extack)
1658 {
1659     struct sk_buff *skb;
1660     unsigned char *b;
1661     struct nlmsghdr *nlh;
1662     struct tcamsg *t;
1663     struct netlink_callback dcb;
1664     struct nlattr *nest;
1665     struct nlattr *tb[TCA_ACT_MAX + 1];
1666     const struct tc_action_ops *ops;
1667     struct nlattr *kind;
1668     int err = -ENOMEM;
1669 
1670     skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1671     if (!skb)
1672         return err;
1673 
1674     b = skb_tail_pointer(skb);
1675 
1676     err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1677                       tcf_action_policy, extack);
1678     if (err < 0)
1679         goto err_out;
1680 
1681     err = -EINVAL;
1682     kind = tb[TCA_ACT_KIND];
1683     ops = tc_lookup_action(kind);
1684     if (!ops) { /*some idjot trying to flush unknown action */
1685         NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1686         goto err_out;
1687     }
1688 
1689     nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1690             sizeof(*t), 0);
1691     if (!nlh) {
1692         NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1693         goto out_module_put;
1694     }
1695     t = nlmsg_data(nlh);
1696     t->tca_family = AF_UNSPEC;
1697     t->tca__pad1 = 0;
1698     t->tca__pad2 = 0;
1699 
1700     nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1701     if (!nest) {
1702         NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1703         goto out_module_put;
1704     }
1705 
1706     err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1707     if (err <= 0) {
1708         nla_nest_cancel(skb, nest);
1709         goto out_module_put;
1710     }
1711 
1712     nla_nest_end(skb, nest);
1713 
1714     nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1715     nlh->nlmsg_flags |= NLM_F_ROOT;
1716     module_put(ops->owner);
1717     err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1718                  n->nlmsg_flags & NLM_F_ECHO);
1719     if (err < 0)
1720         NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1721 
1722     return err;
1723 
1724 out_module_put:
1725     module_put(ops->owner);
1726 err_out:
1727     kfree_skb(skb);
1728     return err;
1729 }
1730 
1731 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1732 {
1733     int i;
1734 
1735     for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1736         struct tc_action *a = actions[i];
1737         const struct tc_action_ops *ops = a->ops;
1738         /* Actions can be deleted concurrently so we must save their
1739          * type and id to search again after reference is released.
1740          */
1741         struct tcf_idrinfo *idrinfo = a->idrinfo;
1742         u32 act_index = a->tcfa_index;
1743 
1744         actions[i] = NULL;
1745         if (tcf_action_put(a)) {
1746             /* last reference, action was deleted concurrently */
1747             module_put(ops->owner);
1748         } else  {
1749             int ret;
1750 
1751             /* now do the delete */
1752             ret = tcf_idr_delete_index(idrinfo, act_index);
1753             if (ret < 0)
1754                 return ret;
1755         }
1756     }
1757     return 0;
1758 }
1759 
1760 static int
1761 tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1762 {
1763     size_t attr_size = tcf_action_fill_size(action);
1764     struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1765         [0] = action,
1766     };
1767     const struct tc_action_ops *ops = action->ops;
1768     struct sk_buff *skb;
1769     int ret;
1770 
1771     skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1772             GFP_KERNEL);
1773     if (!skb)
1774         return -ENOBUFS;
1775 
1776     if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1) <= 0) {
1777         kfree_skb(skb);
1778         return -EINVAL;
1779     }
1780 
1781     ret = tcf_idr_release_unsafe(action);
1782     if (ret == ACT_P_DELETED) {
1783         module_put(ops->owner);
1784         ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0);
1785     } else {
1786         kfree_skb(skb);
1787     }
1788 
1789     return ret;
1790 }
1791 
1792 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1793                 void *cb_priv, bool add)
1794 {
1795     struct tc_act_pernet_id *id_ptr;
1796     struct tcf_idrinfo *idrinfo;
1797     struct tc_action_net *tn;
1798     struct tc_action *p;
1799     unsigned int act_id;
1800     unsigned long tmp;
1801     unsigned long id;
1802     struct idr *idr;
1803     struct net *net;
1804     int ret;
1805 
1806     if (!cb)
1807         return -EINVAL;
1808 
1809     down_read(&net_rwsem);
1810     mutex_lock(&act_id_mutex);
1811 
1812     for_each_net(net) {
1813         list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1814             act_id = id_ptr->id;
1815             tn = net_generic(net, act_id);
1816             if (!tn)
1817                 continue;
1818             idrinfo = tn->idrinfo;
1819             if (!idrinfo)
1820                 continue;
1821 
1822             mutex_lock(&idrinfo->lock);
1823             idr = &idrinfo->action_idr;
1824             idr_for_each_entry_ul(idr, p, tmp, id) {
1825                 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1826                     continue;
1827                 if (add) {
1828                     tcf_action_offload_add_ex(p, NULL, cb,
1829                                   cb_priv);
1830                     continue;
1831                 }
1832 
1833                 /* cb unregister to update hw count */
1834                 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1835                 if (ret < 0)
1836                     continue;
1837                 if (tc_act_skip_sw(p->tcfa_flags) &&
1838                     !tc_act_in_hw(p))
1839                     tcf_reoffload_del_notify(net, p);
1840             }
1841             mutex_unlock(&idrinfo->lock);
1842         }
1843     }
1844     mutex_unlock(&act_id_mutex);
1845     up_read(&net_rwsem);
1846 
1847     return 0;
1848 }
1849 
1850 static int
1851 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1852            u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1853 {
1854     int ret;
1855     struct sk_buff *skb;
1856 
1857     skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1858             GFP_KERNEL);
1859     if (!skb)
1860         return -ENOBUFS;
1861 
1862     if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1863              0, 2) <= 0) {
1864         NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1865         kfree_skb(skb);
1866         return -EINVAL;
1867     }
1868 
1869     /* now do the delete */
1870     ret = tcf_action_delete(net, actions);
1871     if (ret < 0) {
1872         NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1873         kfree_skb(skb);
1874         return ret;
1875     }
1876 
1877     ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1878                  n->nlmsg_flags & NLM_F_ECHO);
1879     return ret;
1880 }
1881 
1882 static int
1883 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1884           u32 portid, int event, struct netlink_ext_ack *extack)
1885 {
1886     int i, ret;
1887     struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1888     struct tc_action *act;
1889     size_t attr_size = 0;
1890     struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1891 
1892     ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1893                       extack);
1894     if (ret < 0)
1895         return ret;
1896 
1897     if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1898         if (tb[1])
1899             return tca_action_flush(net, tb[1], n, portid, extack);
1900 
1901         NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1902         return -EINVAL;
1903     }
1904 
1905     for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1906         act = tcf_action_get_1(net, tb[i], n, portid, extack);
1907         if (IS_ERR(act)) {
1908             ret = PTR_ERR(act);
1909             goto err;
1910         }
1911         attr_size += tcf_action_fill_size(act);
1912         actions[i - 1] = act;
1913     }
1914 
1915     attr_size = tcf_action_full_attrs_size(attr_size);
1916 
1917     if (event == RTM_GETACTION)
1918         ret = tcf_get_notify(net, portid, n, actions, event, extack);
1919     else { /* delete */
1920         ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1921         if (ret)
1922             goto err;
1923         return 0;
1924     }
1925 err:
1926     tcf_action_put_many(actions);
1927     return ret;
1928 }
1929 
1930 static int
1931 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1932            u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1933 {
1934     struct sk_buff *skb;
1935 
1936     skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1937             GFP_KERNEL);
1938     if (!skb)
1939         return -ENOBUFS;
1940 
1941     if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1942              RTM_NEWACTION, 0, 0) <= 0) {
1943         NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1944         kfree_skb(skb);
1945         return -EINVAL;
1946     }
1947 
1948     return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1949                   n->nlmsg_flags & NLM_F_ECHO);
1950 }
1951 
1952 static int tcf_action_add(struct net *net, struct nlattr *nla,
1953               struct nlmsghdr *n, u32 portid, u32 flags,
1954               struct netlink_ext_ack *extack)
1955 {
1956     size_t attr_size = 0;
1957     int loop, ret, i;
1958     struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1959     int init_res[TCA_ACT_MAX_PRIO] = {};
1960 
1961     for (loop = 0; loop < 10; loop++) {
1962         ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
1963                       &attr_size, flags, 0, extack);
1964         if (ret != -EAGAIN)
1965             break;
1966     }
1967 
1968     if (ret < 0)
1969         return ret;
1970     ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1971 
1972     /* only put existing actions */
1973     for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
1974         if (init_res[i] == ACT_P_CREATED)
1975             actions[i] = NULL;
1976     tcf_action_put_many(actions);
1977 
1978     return ret;
1979 }
1980 
1981 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1982     [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
1983                          TCA_ACT_FLAG_TERSE_DUMP),
1984     [TCA_ROOT_TIME_DELTA]      = { .type = NLA_U32 },
1985 };
1986 
1987 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1988              struct netlink_ext_ack *extack)
1989 {
1990     struct net *net = sock_net(skb->sk);
1991     struct nlattr *tca[TCA_ROOT_MAX + 1];
1992     u32 portid = NETLINK_CB(skb).portid;
1993     u32 flags = 0;
1994     int ret = 0;
1995 
1996     if ((n->nlmsg_type != RTM_GETACTION) &&
1997         !netlink_capable(skb, CAP_NET_ADMIN))
1998         return -EPERM;
1999 
2000     ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2001                      TCA_ROOT_MAX, NULL, extack);
2002     if (ret < 0)
2003         return ret;
2004 
2005     if (tca[TCA_ACT_TAB] == NULL) {
2006         NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2007         return -EINVAL;
2008     }
2009 
2010     /* n->nlmsg_flags & NLM_F_CREATE */
2011     switch (n->nlmsg_type) {
2012     case RTM_NEWACTION:
2013         /* we are going to assume all other flags
2014          * imply create only if it doesn't exist
2015          * Note that CREATE | EXCL implies that
2016          * but since we want avoid ambiguity (eg when flags
2017          * is zero) then just set this
2018          */
2019         if (n->nlmsg_flags & NLM_F_REPLACE)
2020             flags = TCA_ACT_FLAGS_REPLACE;
2021         ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2022                      extack);
2023         break;
2024     case RTM_DELACTION:
2025         ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2026                     portid, RTM_DELACTION, extack);
2027         break;
2028     case RTM_GETACTION:
2029         ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2030                     portid, RTM_GETACTION, extack);
2031         break;
2032     default:
2033         BUG();
2034     }
2035 
2036     return ret;
2037 }
2038 
2039 static struct nlattr *find_dump_kind(struct nlattr **nla)
2040 {
2041     struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2042     struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2043     struct nlattr *kind;
2044 
2045     tb1 = nla[TCA_ACT_TAB];
2046     if (tb1 == NULL)
2047         return NULL;
2048 
2049     if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2050         return NULL;
2051 
2052     if (tb[1] == NULL)
2053         return NULL;
2054     if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2055         return NULL;
2056     kind = tb2[TCA_ACT_KIND];
2057 
2058     return kind;
2059 }
2060 
2061 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2062 {
2063     struct net *net = sock_net(skb->sk);
2064     struct nlmsghdr *nlh;
2065     unsigned char *b = skb_tail_pointer(skb);
2066     struct nlattr *nest;
2067     struct tc_action_ops *a_o;
2068     int ret = 0;
2069     struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2070     struct nlattr *tb[TCA_ROOT_MAX + 1];
2071     struct nlattr *count_attr = NULL;
2072     unsigned long jiffy_since = 0;
2073     struct nlattr *kind = NULL;
2074     struct nla_bitfield32 bf;
2075     u32 msecs_since = 0;
2076     u32 act_count = 0;
2077 
2078     ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2079                      TCA_ROOT_MAX, tcaa_policy, cb->extack);
2080     if (ret < 0)
2081         return ret;
2082 
2083     kind = find_dump_kind(tb);
2084     if (kind == NULL) {
2085         pr_info("tc_dump_action: action bad kind\n");
2086         return 0;
2087     }
2088 
2089     a_o = tc_lookup_action(kind);
2090     if (a_o == NULL)
2091         return 0;
2092 
2093     cb->args[2] = 0;
2094     if (tb[TCA_ROOT_FLAGS]) {
2095         bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2096         cb->args[2] = bf.value;
2097     }
2098 
2099     if (tb[TCA_ROOT_TIME_DELTA]) {
2100         msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2101     }
2102 
2103     nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2104             cb->nlh->nlmsg_type, sizeof(*t), 0);
2105     if (!nlh)
2106         goto out_module_put;
2107 
2108     if (msecs_since)
2109         jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2110 
2111     t = nlmsg_data(nlh);
2112     t->tca_family = AF_UNSPEC;
2113     t->tca__pad1 = 0;
2114     t->tca__pad2 = 0;
2115     cb->args[3] = jiffy_since;
2116     count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2117     if (!count_attr)
2118         goto out_module_put;
2119 
2120     nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2121     if (nest == NULL)
2122         goto out_module_put;
2123 
2124     ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
2125     if (ret < 0)
2126         goto out_module_put;
2127 
2128     if (ret > 0) {
2129         nla_nest_end(skb, nest);
2130         ret = skb->len;
2131         act_count = cb->args[1];
2132         memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2133         cb->args[1] = 0;
2134     } else
2135         nlmsg_trim(skb, b);
2136 
2137     nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2138     if (NETLINK_CB(cb->skb).portid && ret)
2139         nlh->nlmsg_flags |= NLM_F_MULTI;
2140     module_put(a_o->owner);
2141     return skb->len;
2142 
2143 out_module_put:
2144     module_put(a_o->owner);
2145     nlmsg_trim(skb, b);
2146     return skb->len;
2147 }
2148 
2149 static int __init tc_action_init(void)
2150 {
2151     rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2152     rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2153     rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2154               0);
2155 
2156     return 0;
2157 }
2158 
2159 subsys_initcall(tc_action_init);
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