#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); void tcf_destroy_chain(struct tcf_proto __rcu **fl); 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) */ int nr_actions; struct tc_action **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 int tcf_exts_init(struct tcf_exts *exts, int action, int police) { #ifdef CONFIG_NET_CLS_ACT exts->type = 0; exts->nr_actions = 0; exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *), GFP_KERNEL); if (!exts->actions) return -ENOMEM; #endif exts->action = action; exts->police = police; return 0; } /** * 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->nr_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); } static inline void tcf_exts_to_list(const struct tcf_exts *exts, struct list_head *actions) { #ifdef CONFIG_NET_CLS_ACT int i; for (i = 0; i < exts->nr_actions; i++) { struct tc_action *a = exts->actions[i]; list_add_tail(&a->list, actions); } #endif } /** * 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->nr_actions) return tcf_action_exec(skb, exts->actions, exts->nr_actions, res); #endif return 0; } #ifdef CONFIG_NET_CLS_ACT #define tc_no_actions(_exts) ((_exts)->nr_actions == 0) #define tc_single_action(_exts) ((_exts)->nr_actions == 1) #else /* CONFIG_NET_CLS_ACT */ #define tc_no_actions(_exts) true #define tc_single_action(_exts) false #endif /* CONFIG_NET_CLS_ACT */ 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); int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts, struct net_device **hw_dev); /** * 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 */ struct tc_cls_u32_knode { struct tcf_exts *exts; struct tc_u32_sel *sel; u32 handle; u32 val; u32 mask; u32 link_handle; u8 fshift; }; struct tc_cls_u32_hnode { u32 handle; u32 prio; unsigned int divisor; }; enum tc_clsu32_command { TC_CLSU32_NEW_KNODE, TC_CLSU32_REPLACE_KNODE, TC_CLSU32_DELETE_KNODE, TC_CLSU32_NEW_HNODE, TC_CLSU32_REPLACE_HNODE, TC_CLSU32_DELETE_HNODE, }; struct tc_cls_u32_offload { /* knode values */ enum tc_clsu32_command command; union { struct tc_cls_u32_knode knode; struct tc_cls_u32_hnode hnode; }; }; static inline bool tc_can_offload(const struct net_device *dev, const struct tcf_proto *tp) { const struct Qdisc *sch = tp->q; const struct Qdisc_class_ops *cops = sch->ops->cl_ops; if (!(dev->features & NETIF_F_HW_TC)) return false; if (!dev->netdev_ops->ndo_setup_tc) return false; if (cops && cops->tcf_cl_offload) return cops->tcf_cl_offload(tp->classid); return true; } static inline bool tc_skip_hw(u32 flags) { return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false; } static inline bool tc_should_offload(const struct net_device *dev, const struct tcf_proto *tp, u32 flags) { if (tc_skip_hw(flags)) return false; return tc_can_offload(dev, tp); } static inline bool tc_skip_sw(u32 flags) { return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false; } /* SKIP_HW and SKIP_SW are mutually exclusive flags. */ static inline bool tc_flags_valid(u32 flags) { if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)) return false; if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW))) return false; return true; } enum tc_fl_command { TC_CLSFLOWER_REPLACE, TC_CLSFLOWER_DESTROY, TC_CLSFLOWER_STATS, }; struct tc_cls_flower_offload { enum tc_fl_command command; u32 prio; unsigned long cookie; struct flow_dissector *dissector; struct fl_flow_key *mask; struct fl_flow_key *key; struct tcf_exts *exts; }; enum tc_matchall_command { TC_CLSMATCHALL_REPLACE, TC_CLSMATCHALL_DESTROY, }; struct tc_cls_matchall_offload { enum tc_matchall_command command; struct tcf_exts *exts; unsigned long cookie; }; enum tc_clsbpf_command { TC_CLSBPF_ADD, TC_CLSBPF_REPLACE, TC_CLSBPF_DESTROY, TC_CLSBPF_STATS, }; struct tc_cls_bpf_offload { enum tc_clsbpf_command command; struct tcf_exts *exts; struct bpf_prog *prog; const char *name; bool exts_integrated; u32 gen_flags; }; /* This structure holds cookie structure that is passed from user * to the kernel for actions and classifiers */ struct tc_cookie { u8 *data; u32 len; }; #endif