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505 lines
12 KiB
505 lines
12 KiB
#ifndef __NET_PKT_CLS_H |
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#define __NET_PKT_CLS_H |
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#include <linux/pkt_cls.h> |
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#include <net/sch_generic.h> |
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#include <net/act_api.h> |
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|
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/* Basic packet classifier frontend definitions. */ |
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struct tcf_walker { |
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int stop; |
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int skip; |
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int count; |
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int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); |
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}; |
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int register_tcf_proto_ops(struct tcf_proto_ops *ops); |
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int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); |
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static inline unsigned long |
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__cls_set_class(unsigned long *clp, unsigned long cl) |
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{ |
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return xchg(clp, cl); |
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} |
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static inline unsigned long |
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cls_set_class(struct tcf_proto *tp, unsigned long *clp, |
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unsigned long cl) |
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{ |
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unsigned long old_cl; |
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tcf_tree_lock(tp); |
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old_cl = __cls_set_class(clp, cl); |
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tcf_tree_unlock(tp); |
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return old_cl; |
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} |
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static inline void |
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tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) |
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{ |
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unsigned long cl; |
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cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid); |
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cl = cls_set_class(tp, &r->class, cl); |
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if (cl) |
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tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); |
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} |
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static inline void |
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tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) |
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{ |
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unsigned long cl; |
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if ((cl = __cls_set_class(&r->class, 0)) != 0) |
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tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); |
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} |
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struct tcf_exts { |
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#ifdef CONFIG_NET_CLS_ACT |
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__u32 type; /* for backward compat(TCA_OLD_COMPAT) */ |
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int nr_actions; |
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struct tc_action **actions; |
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#endif |
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/* Map to export classifier specific extension TLV types to the |
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* generic extensions API. Unsupported extensions must be set to 0. |
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*/ |
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int action; |
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int police; |
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}; |
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static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police) |
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{ |
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#ifdef CONFIG_NET_CLS_ACT |
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exts->type = 0; |
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exts->nr_actions = 0; |
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exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *), |
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GFP_KERNEL); |
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if (!exts->actions) |
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return -ENOMEM; |
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#endif |
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exts->action = action; |
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exts->police = police; |
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return 0; |
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} |
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/** |
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* tcf_exts_is_predicative - check if a predicative extension is present |
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* @exts: tc filter extensions handle |
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* |
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* Returns 1 if a predicative extension is present, i.e. an extension which |
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* might cause further actions and thus overrule the regular tcf_result. |
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*/ |
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static inline int |
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tcf_exts_is_predicative(struct tcf_exts *exts) |
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{ |
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#ifdef CONFIG_NET_CLS_ACT |
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return exts->nr_actions; |
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#else |
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return 0; |
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#endif |
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} |
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/** |
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* tcf_exts_is_available - check if at least one extension is present |
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* @exts: tc filter extensions handle |
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* |
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* Returns 1 if at least one extension is present. |
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*/ |
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static inline int |
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tcf_exts_is_available(struct tcf_exts *exts) |
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{ |
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/* All non-predicative extensions must be added here. */ |
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return tcf_exts_is_predicative(exts); |
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} |
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static inline void tcf_exts_to_list(const struct tcf_exts *exts, |
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struct list_head *actions) |
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{ |
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#ifdef CONFIG_NET_CLS_ACT |
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int i; |
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for (i = 0; i < exts->nr_actions; i++) { |
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struct tc_action *a = exts->actions[i]; |
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list_add_tail(&a->list, actions); |
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} |
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#endif |
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} |
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/** |
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* tcf_exts_exec - execute tc filter extensions |
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* @skb: socket buffer |
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* @exts: tc filter extensions handle |
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* @res: desired result |
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* |
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* Executes all configured extensions. Returns 0 on a normal execution, |
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* a negative number if the filter must be considered unmatched or |
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* a positive action code (TC_ACT_*) which must be returned to the |
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* underlying layer. |
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*/ |
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static inline int |
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tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, |
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struct tcf_result *res) |
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{ |
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#ifdef CONFIG_NET_CLS_ACT |
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if (exts->nr_actions) |
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return tcf_action_exec(skb, exts->actions, exts->nr_actions, |
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res); |
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#endif |
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return 0; |
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} |
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#ifdef CONFIG_NET_CLS_ACT |
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#define tc_no_actions(_exts) ((_exts)->nr_actions == 0) |
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#define tc_single_action(_exts) ((_exts)->nr_actions == 1) |
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#else /* CONFIG_NET_CLS_ACT */ |
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#define tc_no_actions(_exts) true |
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#define tc_single_action(_exts) false |
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#endif /* CONFIG_NET_CLS_ACT */ |
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int tcf_exts_validate(struct net *net, struct tcf_proto *tp, |
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struct nlattr **tb, struct nlattr *rate_tlv, |
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struct tcf_exts *exts, bool ovr); |
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void tcf_exts_destroy(struct tcf_exts *exts); |
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void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
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struct tcf_exts *src); |
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int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts); |
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int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts); |
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/** |
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* struct tcf_pkt_info - packet information |
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*/ |
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struct tcf_pkt_info { |
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unsigned char * ptr; |
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int nexthdr; |
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}; |
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#ifdef CONFIG_NET_EMATCH |
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struct tcf_ematch_ops; |
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/** |
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* struct tcf_ematch - extended match (ematch) |
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* |
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* @matchid: identifier to allow userspace to reidentify a match |
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* @flags: flags specifying attributes and the relation to other matches |
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* @ops: the operations lookup table of the corresponding ematch module |
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* @datalen: length of the ematch specific configuration data |
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* @data: ematch specific data |
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*/ |
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struct tcf_ematch { |
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struct tcf_ematch_ops * ops; |
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unsigned long data; |
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unsigned int datalen; |
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u16 matchid; |
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u16 flags; |
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struct net *net; |
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}; |
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static inline int tcf_em_is_container(struct tcf_ematch *em) |
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{ |
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return !em->ops; |
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} |
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static inline int tcf_em_is_simple(struct tcf_ematch *em) |
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{ |
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return em->flags & TCF_EM_SIMPLE; |
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} |
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static inline int tcf_em_is_inverted(struct tcf_ematch *em) |
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{ |
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return em->flags & TCF_EM_INVERT; |
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} |
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static inline int tcf_em_last_match(struct tcf_ematch *em) |
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{ |
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return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; |
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} |
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static inline int tcf_em_early_end(struct tcf_ematch *em, int result) |
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{ |
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if (tcf_em_last_match(em)) |
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return 1; |
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if (result == 0 && em->flags & TCF_EM_REL_AND) |
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return 1; |
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if (result != 0 && em->flags & TCF_EM_REL_OR) |
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return 1; |
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return 0; |
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} |
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/** |
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* struct tcf_ematch_tree - ematch tree handle |
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* |
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* @hdr: ematch tree header supplied by userspace |
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* @matches: array of ematches |
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*/ |
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struct tcf_ematch_tree { |
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struct tcf_ematch_tree_hdr hdr; |
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struct tcf_ematch * matches; |
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}; |
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/** |
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* struct tcf_ematch_ops - ematch module operations |
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* |
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* @kind: identifier (kind) of this ematch module |
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* @datalen: length of expected configuration data (optional) |
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* @change: called during validation (optional) |
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* @match: called during ematch tree evaluation, must return 1/0 |
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* @destroy: called during destroyage (optional) |
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* @dump: called during dumping process (optional) |
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* @owner: owner, must be set to THIS_MODULE |
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* @link: link to previous/next ematch module (internal use) |
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*/ |
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struct tcf_ematch_ops { |
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int kind; |
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int datalen; |
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int (*change)(struct net *net, void *, |
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int, struct tcf_ematch *); |
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int (*match)(struct sk_buff *, struct tcf_ematch *, |
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struct tcf_pkt_info *); |
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void (*destroy)(struct tcf_ematch *); |
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int (*dump)(struct sk_buff *, struct tcf_ematch *); |
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struct module *owner; |
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struct list_head link; |
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}; |
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int tcf_em_register(struct tcf_ematch_ops *); |
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void tcf_em_unregister(struct tcf_ematch_ops *); |
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int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, |
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struct tcf_ematch_tree *); |
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void tcf_em_tree_destroy(struct tcf_ematch_tree *); |
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int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); |
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int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, |
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struct tcf_pkt_info *); |
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/** |
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* tcf_em_tree_change - replace ematch tree of a running classifier |
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* |
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* @tp: classifier kind handle |
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* @dst: destination ematch tree variable |
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* @src: source ematch tree (temporary tree from tcf_em_tree_validate) |
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* |
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* This functions replaces the ematch tree in @dst with the ematch |
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* tree in @src. The classifier in charge of the ematch tree may be |
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* running. |
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*/ |
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static inline void tcf_em_tree_change(struct tcf_proto *tp, |
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struct tcf_ematch_tree *dst, |
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struct tcf_ematch_tree *src) |
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{ |
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tcf_tree_lock(tp); |
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memcpy(dst, src, sizeof(*dst)); |
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tcf_tree_unlock(tp); |
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} |
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/** |
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* tcf_em_tree_match - evaulate an ematch tree |
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* |
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* @skb: socket buffer of the packet in question |
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* @tree: ematch tree to be used for evaluation |
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* @info: packet information examined by classifier |
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* |
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* This function matches @skb against the ematch tree in @tree by going |
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* through all ematches respecting their logic relations returning |
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* as soon as the result is obvious. |
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* |
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* Returns 1 if the ematch tree as-one matches, no ematches are configured |
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* or ematch is not enabled in the kernel, otherwise 0 is returned. |
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*/ |
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static inline int tcf_em_tree_match(struct sk_buff *skb, |
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struct tcf_ematch_tree *tree, |
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struct tcf_pkt_info *info) |
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{ |
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if (tree->hdr.nmatches) |
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return __tcf_em_tree_match(skb, tree, info); |
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else |
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return 1; |
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} |
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#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) |
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#else /* CONFIG_NET_EMATCH */ |
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struct tcf_ematch_tree { |
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}; |
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#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) |
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#define tcf_em_tree_destroy(t) do { (void)(t); } while(0) |
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#define tcf_em_tree_dump(skb, t, tlv) (0) |
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#define tcf_em_tree_change(tp, dst, src) do { } while(0) |
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#define tcf_em_tree_match(skb, t, info) ((void)(info), 1) |
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#endif /* CONFIG_NET_EMATCH */ |
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static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) |
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{ |
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switch (layer) { |
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case TCF_LAYER_LINK: |
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return skb->data; |
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case TCF_LAYER_NETWORK: |
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return skb_network_header(skb); |
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case TCF_LAYER_TRANSPORT: |
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return skb_transport_header(skb); |
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} |
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return NULL; |
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} |
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static inline int tcf_valid_offset(const struct sk_buff *skb, |
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const unsigned char *ptr, const int len) |
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{ |
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return likely((ptr + len) <= skb_tail_pointer(skb) && |
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ptr >= skb->head && |
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(ptr <= (ptr + len))); |
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} |
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#ifdef CONFIG_NET_CLS_IND |
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#include <net/net_namespace.h> |
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static inline int |
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tcf_change_indev(struct net *net, struct nlattr *indev_tlv) |
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{ |
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char indev[IFNAMSIZ]; |
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struct net_device *dev; |
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if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) |
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return -EINVAL; |
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dev = __dev_get_by_name(net, indev); |
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if (!dev) |
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return -ENODEV; |
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return dev->ifindex; |
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} |
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static inline bool |
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tcf_match_indev(struct sk_buff *skb, int ifindex) |
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{ |
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if (!ifindex) |
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return true; |
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if (!skb->skb_iif) |
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return false; |
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return ifindex == skb->skb_iif; |
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} |
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#endif /* CONFIG_NET_CLS_IND */ |
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struct tc_cls_u32_knode { |
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struct tcf_exts *exts; |
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struct tc_u32_sel *sel; |
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u32 handle; |
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u32 val; |
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u32 mask; |
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u32 link_handle; |
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u8 fshift; |
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}; |
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struct tc_cls_u32_hnode { |
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u32 handle; |
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u32 prio; |
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unsigned int divisor; |
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}; |
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enum tc_clsu32_command { |
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TC_CLSU32_NEW_KNODE, |
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TC_CLSU32_REPLACE_KNODE, |
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TC_CLSU32_DELETE_KNODE, |
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TC_CLSU32_NEW_HNODE, |
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TC_CLSU32_REPLACE_HNODE, |
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TC_CLSU32_DELETE_HNODE, |
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}; |
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struct tc_cls_u32_offload { |
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/* knode values */ |
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enum tc_clsu32_command command; |
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union { |
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struct tc_cls_u32_knode knode; |
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struct tc_cls_u32_hnode hnode; |
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}; |
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}; |
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static inline bool tc_should_offload(const struct net_device *dev, |
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const struct tcf_proto *tp, u32 flags) |
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{ |
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const struct Qdisc *sch = tp->q; |
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const struct Qdisc_class_ops *cops = sch->ops->cl_ops; |
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if (!(dev->features & NETIF_F_HW_TC)) |
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return false; |
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if (flags & TCA_CLS_FLAGS_SKIP_HW) |
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return false; |
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if (!dev->netdev_ops->ndo_setup_tc) |
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return false; |
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if (cops && cops->tcf_cl_offload) |
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return cops->tcf_cl_offload(tp->classid); |
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return true; |
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} |
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static inline bool tc_skip_sw(u32 flags) |
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{ |
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return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false; |
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} |
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/* SKIP_HW and SKIP_SW are mutually exclusive flags. */ |
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static inline bool tc_flags_valid(u32 flags) |
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{ |
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if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)) |
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return false; |
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if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW))) |
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return false; |
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return true; |
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} |
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enum tc_fl_command { |
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TC_CLSFLOWER_REPLACE, |
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TC_CLSFLOWER_DESTROY, |
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TC_CLSFLOWER_STATS, |
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}; |
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struct tc_cls_flower_offload { |
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enum tc_fl_command command; |
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unsigned long cookie; |
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struct flow_dissector *dissector; |
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struct fl_flow_key *mask; |
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struct fl_flow_key *key; |
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struct tcf_exts *exts; |
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}; |
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enum tc_matchall_command { |
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TC_CLSMATCHALL_REPLACE, |
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TC_CLSMATCHALL_DESTROY, |
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}; |
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struct tc_cls_matchall_offload { |
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enum tc_matchall_command command; |
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struct tcf_exts *exts; |
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unsigned long cookie; |
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}; |
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enum tc_clsbpf_command { |
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TC_CLSBPF_ADD, |
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TC_CLSBPF_REPLACE, |
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TC_CLSBPF_DESTROY, |
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TC_CLSBPF_STATS, |
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}; |
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struct tc_cls_bpf_offload { |
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enum tc_clsbpf_command command; |
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struct tcf_exts *exts; |
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struct bpf_prog *prog; |
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const char *name; |
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bool exts_integrated; |
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u32 gen_flags; |
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}; |
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#endif
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