366 lines
9.1 KiB
C
366 lines
9.1 KiB
C
#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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/* Basic packet classifier frontend definitions. */
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struct tcf_walker
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{
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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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extern int register_tcf_proto_ops(struct tcf_proto_ops *ops);
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extern 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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unsigned long old_cl;
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old_cl = *clp;
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*clp = cl;
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return old_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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{
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#ifdef CONFIG_NET_CLS_ACT
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struct tc_action *action;
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#endif
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};
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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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struct tcf_ext_map
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{
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int action;
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int police;
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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->action;
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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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/**
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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->action)
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return tcf_action_exec(skb, exts->action, res);
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#endif
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return 0;
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}
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extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
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struct nlattr *rate_tlv, struct tcf_exts *exts,
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const struct tcf_ext_map *map);
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extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts);
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extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
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struct tcf_exts *src);
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extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
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const struct tcf_ext_map *map);
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extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
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const struct tcf_ext_map *map);
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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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{
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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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{
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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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};
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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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{
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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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{
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int kind;
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int datalen;
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int (*change)(struct tcf_proto *, 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_proto *,
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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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extern int tcf_em_register(struct tcf_ematch_ops *);
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extern void tcf_em_unregister(struct tcf_ematch_ops *);
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extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
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struct tcf_ematch_tree *);
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extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *);
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extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
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extern 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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};
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#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
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#define tcf_em_tree_destroy(tp, 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 unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head);
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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 tcf_proto *tp, char *indev, struct nlattr *indev_tlv)
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{
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if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
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return -EINVAL;
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return 0;
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}
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static inline int
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tcf_match_indev(struct sk_buff *skb, char *indev)
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{
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struct net_device *dev;
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if (indev[0]) {
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if (!skb->iif)
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return 0;
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dev = __dev_get_by_index(dev_net(skb->dev), skb->iif);
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if (!dev || strcmp(indev, dev->name))
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return 0;
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}
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return 1;
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}
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#endif /* CONFIG_NET_CLS_IND */
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#endif
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