diff options
Diffstat (limited to 'include/net/pkt_cls.h')
| -rw-r--r-- | include/net/pkt_cls.h | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h new file mode 100644 index 000000000..bc49967e1 --- /dev/null +++ b/include/net/pkt_cls.h @@ -0,0 +1,361 @@ +#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 *); +}; + +int register_tcf_proto_ops(struct tcf_proto_ops *ops); +int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); + +static inline unsigned long +__cls_set_class(unsigned long *clp, unsigned long cl) +{ + return xchg(clp, 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 + __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ + struct list_head actions; +#endif + /* Map to export classifier specific extension TLV types to the + * generic extensions API. Unsupported extensions must be set to 0. + */ + int action; + int police; +}; + +static inline void tcf_exts_init(struct tcf_exts *exts, int action, int police) +{ +#ifdef CONFIG_NET_CLS_ACT + exts->type = 0; + INIT_LIST_HEAD(&exts->actions); +#endif + exts->action = action; + exts->police = 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 !list_empty(&exts->actions); +#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 (!list_empty(&exts->actions)) + return tcf_action_exec(skb, &exts->actions, res); +#endif + return 0; +} + +int tcf_exts_validate(struct net *net, struct tcf_proto *tp, + struct nlattr **tb, struct nlattr *rate_tlv, + struct tcf_exts *exts, bool ovr); +void tcf_exts_destroy(struct tcf_exts *exts); +void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, + struct tcf_exts *src); +int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts); +int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts); + +/** + * 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; + struct net *net; +}; + +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 net *net, void *, + int, struct tcf_ematch *); + int (*match)(struct sk_buff *, struct tcf_ematch *, + struct tcf_pkt_info *); + void (*destroy)(struct tcf_ematch *); + int (*dump)(struct sk_buff *, struct tcf_ematch *); + struct module *owner; + struct list_head link; +}; + +int tcf_em_register(struct tcf_ematch_ops *); +void tcf_em_unregister(struct tcf_ematch_ops *); +int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, + struct tcf_ematch_tree *); +void tcf_em_tree_destroy(struct tcf_ematch_tree *); +int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); +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(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 likely((ptr + len) <= skb_tail_pointer(skb) && + ptr >= skb->head && + (ptr <= (ptr + len))); +} + +#ifdef CONFIG_NET_CLS_IND +#include <net/net_namespace.h> + +static inline int +tcf_change_indev(struct net *net, struct nlattr *indev_tlv) +{ + char indev[IFNAMSIZ]; + struct net_device *dev; + + if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) + return -EINVAL; + dev = __dev_get_by_name(net, indev); + if (!dev) + return -ENODEV; + return dev->ifindex; +} + +static inline bool +tcf_match_indev(struct sk_buff *skb, int ifindex) +{ + if (!ifindex) + return true; + if (!skb->skb_iif) + return false; + return ifindex == skb->skb_iif; +} +#endif /* CONFIG_NET_CLS_IND */ + +#endif |