#ifndef __NET_PKT_CLS_H #define __NET_PKT_CLS_H #include <linux/pkt_cls.h> #include <net/sch_generic.h> #include <net/act_api.h> /* Basic packet classifier frontend definitions. */ struct tcf_walker { int stop; int skip; int count; int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); }; extern int register_tcf_proto_ops(struct tcf_proto_ops *ops); extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); static inline unsigned long __cls_set_class(unsigned long *clp, unsigned long cl) { unsigned long old_cl; old_cl = *clp; *clp = cl; return old_cl; } static inline unsigned long cls_set_class(struct tcf_proto *tp, unsigned long *clp, unsigned long cl) { unsigned long old_cl; tcf_tree_lock(tp); old_cl = __cls_set_class(clp, cl); tcf_tree_unlock(tp); return old_cl; } static inline void tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) { unsigned long cl; cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid); cl = cls_set_class(tp, &r->class, cl); if (cl) tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); } static inline void tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) { unsigned long cl; if ((cl = __cls_set_class(&r->class, 0)) != 0) tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); } struct tcf_exts { #ifdef CONFIG_NET_CLS_ACT struct tc_action *action; #endif }; /* Map to export classifier specific extension TLV types to the * generic extensions API. Unsupported extensions must be set to 0. */ struct tcf_ext_map { int action; int police; }; /** * tcf_exts_is_predicative - check if a predicative extension is present * @exts: tc filter extensions handle * * Returns 1 if a predicative extension is present, i.e. an extension which * might cause further actions and thus overrule the regular tcf_result. */ static inline int tcf_exts_is_predicative(struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT return !!exts->action; #else return 0; #endif } /** * tcf_exts_is_available - check if at least one extension is present * @exts: tc filter extensions handle * * Returns 1 if at least one extension is present. */ static inline int tcf_exts_is_available(struct tcf_exts *exts) { /* All non-predicative extensions must be added here. */ return tcf_exts_is_predicative(exts); } /** * tcf_exts_exec - execute tc filter extensions * @skb: socket buffer * @exts: tc filter extensions handle * @res: desired result * * Executes all configured extensions. Returns 0 on a normal execution, * a negative number if the filter must be considered unmatched or * a positive action code (TC_ACT_*) which must be returned to the * underlying layer. */ static inline int tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, struct tcf_result *res) { #ifdef CONFIG_NET_CLS_ACT if (exts->action) return tcf_action_exec(skb, exts->action, res); #endif return 0; } extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb, struct nlattr *rate_tlv, struct tcf_exts *exts, const struct tcf_ext_map *map); extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, struct tcf_exts *src); extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, const struct tcf_ext_map *map); extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, const struct tcf_ext_map *map); /** * struct tcf_pkt_info - packet information */ struct tcf_pkt_info { unsigned char * ptr; int nexthdr; }; #ifdef CONFIG_NET_EMATCH struct tcf_ematch_ops; /** * struct tcf_ematch - extended match (ematch) * * @matchid: identifier to allow userspace to reidentify a match * @flags: flags specifying attributes and the relation to other matches * @ops: the operations lookup table of the corresponding ematch module * @datalen: length of the ematch specific configuration data * @data: ematch specific data */ struct tcf_ematch { struct tcf_ematch_ops * ops; unsigned long data; unsigned int datalen; u16 matchid; u16 flags; }; static inline int tcf_em_is_container(struct tcf_ematch *em) { return !em->ops; } static inline int tcf_em_is_simple(struct tcf_ematch *em) { return em->flags & TCF_EM_SIMPLE; } static inline int tcf_em_is_inverted(struct tcf_ematch *em) { return em->flags & TCF_EM_INVERT; } static inline int tcf_em_last_match(struct tcf_ematch *em) { return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; } static inline int tcf_em_early_end(struct tcf_ematch *em, int result) { if (tcf_em_last_match(em)) return 1; if (result == 0 && em->flags & TCF_EM_REL_AND) return 1; if (result != 0 && em->flags & TCF_EM_REL_OR) return 1; return 0; } /** * struct tcf_ematch_tree - ematch tree handle * * @hdr: ematch tree header supplied by userspace * @matches: array of ematches */ struct tcf_ematch_tree { struct tcf_ematch_tree_hdr hdr; struct tcf_ematch * matches; }; /** * struct tcf_ematch_ops - ematch module operations * * @kind: identifier (kind) of this ematch module * @datalen: length of expected configuration data (optional) * @change: called during validation (optional) * @match: called during ematch tree evaluation, must return 1/0 * @destroy: called during destroyage (optional) * @dump: called during dumping process (optional) * @owner: owner, must be set to THIS_MODULE * @link: link to previous/next ematch module (internal use) */ struct tcf_ematch_ops { int kind; int datalen; int (*change)(struct tcf_proto *, void *, int, struct tcf_ematch *); int (*match)(struct sk_buff *, struct tcf_ematch *, struct tcf_pkt_info *); void (*destroy)(struct tcf_proto *, struct tcf_ematch *); int (*dump)(struct sk_buff *, struct tcf_ematch *); struct module *owner; struct list_head link; }; extern int tcf_em_register(struct tcf_ematch_ops *); extern int tcf_em_unregister(struct tcf_ematch_ops *); extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, struct tcf_ematch_tree *); extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, struct tcf_pkt_info *); /** * tcf_em_tree_change - replace ematch tree of a running classifier * * @tp: classifier kind handle * @dst: destination ematch tree variable * @src: source ematch tree (temporary tree from tcf_em_tree_validate) * * This functions replaces the ematch tree in @dst with the ematch * tree in @src. The classifier in charge of the ematch tree may be * running. */ static inline void tcf_em_tree_change(struct tcf_proto *tp, struct tcf_ematch_tree *dst, struct tcf_ematch_tree *src) { tcf_tree_lock(tp); memcpy(dst, src, sizeof(*dst)); tcf_tree_unlock(tp); } /** * tcf_em_tree_match - evaulate an ematch tree * * @skb: socket buffer of the packet in question * @tree: ematch tree to be used for evaluation * @info: packet information examined by classifier * * This function matches @skb against the ematch tree in @tree by going * through all ematches respecting their logic relations returning * as soon as the result is obvious. * * Returns 1 if the ematch tree as-one matches, no ematches are configured * or ematch is not enabled in the kernel, otherwise 0 is returned. */ static inline int tcf_em_tree_match(struct sk_buff *skb, struct tcf_ematch_tree *tree, struct tcf_pkt_info *info) { if (tree->hdr.nmatches) return __tcf_em_tree_match(skb, tree, info); else return 1; } #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) #else /* CONFIG_NET_EMATCH */ struct tcf_ematch_tree { }; #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) #define tcf_em_tree_dump(skb, t, tlv) (0) #define tcf_em_tree_change(tp, dst, src) do { } while(0) #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) #endif /* CONFIG_NET_EMATCH */ static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) { switch (layer) { case TCF_LAYER_LINK: return skb->data; case TCF_LAYER_NETWORK: return skb_network_header(skb); case TCF_LAYER_TRANSPORT: return skb_transport_header(skb); } return NULL; } static inline int tcf_valid_offset(const struct sk_buff *skb, const unsigned char *ptr, const int len) { return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head); } #ifdef CONFIG_NET_CLS_IND #include <net/net_namespace.h> static inline int tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv) { if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) return -EINVAL; return 0; } static inline int tcf_match_indev(struct sk_buff *skb, char *indev) { struct net_device *dev; if (indev[0]) { if (!skb->iif) return 0; dev = __dev_get_by_index(dev_net(skb->dev), skb->iif); if (!dev || strcmp(indev, dev->name)) return 0; } return 1; } #endif /* CONFIG_NET_CLS_IND */ #endif