cregit-Linux how code gets into the kernel

Release 4.16 include/net/pkt_cls.h

Directory: include/net
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_PKT_CLS_H

#define __NET_PKT_CLS_H

#include <linux/pkt_cls.h>
#include <linux/workqueue.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 *, void *node, struct tcf_walker *);
};

int register_tcf_proto_ops(struct tcf_proto_ops *ops);
int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);


enum tcf_block_binder_type {
	
TCF_BLOCK_BINDER_TYPE_UNSPEC,
	
TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
	
TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
};


struct tcf_block_ext_info {
	
enum tcf_block_binder_type binder_type;
	
tcf_chain_head_change_t *chain_head_change;
	
void *chain_head_change_priv;
	
u32 block_index;
};

struct tcf_block_cb;
bool tcf_queue_work(struct work_struct *work);

#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
				bool create);
void tcf_chain_put(struct tcf_chain *chain);
void tcf_block_netif_keep_dst(struct tcf_block *block);
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
		  struct netlink_ext_ack *extack);
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
		      struct tcf_block_ext_info *ei,
		      struct netlink_ext_ack *extack);
void tcf_block_put(struct tcf_block *block);
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
		       struct tcf_block_ext_info *ei);


static inline bool tcf_block_shared(struct tcf_block *block) { return block->index; }

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static inline struct Qdisc *tcf_block_q(struct tcf_block *block) { WARN_ON(tcf_block_shared(block)); return block->q; }

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static inline struct net_device *tcf_block_dev(struct tcf_block *block) { return tcf_block_q(block)->dev_queue->dev; }

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void *tcf_block_cb_priv(struct tcf_block_cb *block_cb); struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident); void tcf_block_cb_incref(struct tcf_block_cb *block_cb); unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb); struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident, void *cb_priv); int tcf_block_cb_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident, void *cb_priv); void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb); void tcf_block_cb_unregister(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident); int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res, bool compat_mode); #else
static inline int tcf_block_get(struct tcf_block **p_block, struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, struct netlink_ext_ack *extack) { return 0; }

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static inline int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, struct tcf_block_ext_info *ei, struct netlink_ext_ack *extack) { return 0; }

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static inline void tcf_block_put(struct tcf_block *block) { }

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static inline void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, struct tcf_block_ext_info *ei) { }

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static inline struct Qdisc *tcf_block_q(struct tcf_block *block) { return NULL; }

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static inline struct net_device *tcf_block_dev(struct tcf_block *block) { return NULL; }

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static inline int tc_setup_cb_block_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_priv) { return 0; }

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static inline void tc_setup_cb_block_unregister(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_priv) { }

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static inline void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) { return NULL; }

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static inline struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident) { return NULL; }

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static inline void tcf_block_cb_incref(struct tcf_block_cb *block_cb) { }

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static inline unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) { return 0; }

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static inline struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident, void *cb_priv) { return NULL; }

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static inline int tcf_block_cb_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident, void *cb_priv) { return 0; }

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static inline void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb) { }

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static inline void tcf_block_cb_unregister(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident) { }

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static inline int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res, bool compat_mode) { return TC_ACT_UNSPEC; }

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#endif
static inline unsigned long __cls_set_class(unsigned long *clp, unsigned long cl) { return xchg(clp, cl); }

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static inline unsigned long cls_set_class(struct Qdisc *q, unsigned long *clp, unsigned long cl) { unsigned long old_cl; sch_tree_lock(q); old_cl = __cls_set_class(clp, cl); sch_tree_unlock(q); return old_cl; }

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static inline void tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) { struct Qdisc *q = tp->chain->block->q; unsigned long cl; /* Check q as it is not set for shared blocks. In that case, * setting class is not supported. */ if (!q) return; cl = q->ops->cl_ops->bind_tcf(q, base, r->classid); cl = cls_set_class(q, &r->class, cl); if (cl) q->ops->cl_ops->unbind_tcf(q, cl); }

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static inline void tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) { struct Qdisc *q = tp->chain->block->q; unsigned long cl; if (!q) return; if ((cl = __cls_set_class(&r->class, 0)) != 0) q->ops->cl_ops->unbind_tcf(q, cl); }

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struct tcf_exts { #ifdef CONFIG_NET_CLS_ACT __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ int nr_actions; struct tc_action **actions; struct net *net; #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->net = NULL; 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; }

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/* Return false if the netns is being destroyed in cleanup_net(). Callers * need to do cleanup synchronously in this case, otherwise may race with * tc_action_net_exit(). Return true for other cases. */
static inline bool tcf_exts_get_net(struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT exts->net = maybe_get_net(exts->net); return exts->net != NULL; #else return true; #endif }

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static inline void tcf_exts_put_net(struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT if (exts->net) put_net(exts->net); #endif }

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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 }

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static inline void tcf_exts_stats_update(const struct tcf_exts *exts, u64 bytes, u64 packets, u64 lastuse) { #ifdef CONFIG_NET_CLS_ACT int i; preempt_disable(); for (i = 0; i < exts->nr_actions; i++) { struct tc_action *a = exts->actions[i]; tcf_action_stats_update(a, bytes, packets, lastuse); } preempt_enable(); #endif }

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/** * tcf_exts_has_actions - check if at least one action is present * @exts: tc filter extensions handle * * Returns true if at least one action is present. */
static inline bool tcf_exts_has_actions(struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT return exts->nr_actions; #else return false; #endif }

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/** * tcf_exts_has_one_action - check if exactly one action is present * @exts: tc filter extensions handle * * Returns true if exactly one action is present. */
static inline bool tcf_exts_has_one_action(struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT return exts->nr_actions == 1; #else return false; #endif }

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/** * tcf_exts_exec - execute tc filter extensions * @skb: socket buffer * @exts: tc filter extensions handle * @res: desired result * * Executes all configured extensions. Returns TC_ACT_OK 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 return tcf_action_exec(skb, exts->actions, exts->nr_actions, res); #endif return TC_ACT_OK; }

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int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, struct netlink_ext_ack *extack); void tcf_exts_destroy(struct tcf_exts *exts); void tcf_exts_change(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; }

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static inline int tcf_em_is_simple(struct tcf_ematch *em) { return em->flags & TCF_EM_SIMPLE; }

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static inline int tcf_em_is_inverted(struct tcf_ematch *em) { return em->flags & TCF_EM_INVERT; }

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static inline int tcf_em_last_match(struct tcf_ematch *em) { return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; }

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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; }

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/** * 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_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; }

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#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_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_mac_header(skb); case TCF_LAYER_NETWORK: return skb_network_header(skb); case TCF_LAYER_TRANSPORT: return skb_transport_header(skb); } return NULL; }

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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))); }

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#ifdef CONFIG_NET_CLS_IND #include <net/net_namespace.h>
static inline int tcf_change_indev(struct net *net, struct nlattr *indev_tlv, struct netlink_ext_ack *extack) { char indev[IFNAMSIZ]; struct net_device *dev; if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) { NL_SET_ERR_MSG(extack, "Interface name too long"); return -EINVAL; } dev = __dev_get_by_name(net, indev); if (!dev) return -ENODEV; return dev->ifindex; }

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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; }

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#endif /* CONFIG_NET_CLS_IND */ int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, enum tc_setup_type type, void *type_data, bool err_stop); enum tc_block_command { TC_BLOCK_BIND, TC_BLOCK_UNBIND, }; struct tc_block_offload { enum tc_block_command command; enum tcf_block_binder_type binder_type; struct tcf_block *block; }; struct tc_cls_common_offload { u32 chain_index; __be16 protocol; u32 prio; struct netlink_ext_ack *extack; }; 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 { struct tc_cls_common_offload common; /* 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) { return dev->features & NETIF_F_HW_TC; }

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static inline bool tc_can_offload_extack(const struct net_device *dev, struct netlink_ext_ack *extack) { bool can = tc_can_offload(dev); if (!can) NL_SET_ERR_MSG(extack, "TC offload is disabled on net device"); return can; }

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static inline bool tc_cls_can_offload_and_chain0(const struct net_device *dev, struct tc_cls_common_offload *common) { if (!tc_can_offload_extack(dev, common->extack)) return false; if (common->chain_index) { NL_SET_ERR_MSG(common->extack, "Driver supports only offload of chain 0"); return false; } return true; }

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static inline bool tc_skip_hw(u32 flags) { return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false; }

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static inline bool tc_skip_sw(u32 flags) { return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false; }

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/* 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; }

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static inline bool tc_in_hw(u32 flags) { return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false; }

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Or Gerlitz21100.00%1100.00%
Total21100.00%1100.00%


static inline void tc_cls_common_offload_init(struct tc_cls_common_offload *cls_common, const struct tcf_proto *tp, u32 flags, struct netlink_ext_ack *extack) { cls_common->chain_index = tp->chain->index; cls_common->protocol = tp->protocol; cls_common->prio = tp->prio; if (tc_skip_sw(flags)) cls_common->extack = extack; }

Contributors

PersonTokensPropCommitsCommitProp
Jakub Kiciński65100.00%1100.00%
Total65100.00%1100.00%

enum tc_fl_command { TC_CLSFLOWER_REPLACE, TC_CLSFLOWER_DESTROY, TC_CLSFLOWER_STATS, }; struct tc_cls_flower_offload { struct tc_cls_common_offload common; enum tc_fl_command command; unsigned long cookie; struct flow_dissector *dissector; struct fl_flow_key *mask; struct fl_flow_key *key; struct tcf_exts *exts; u32 classid; }; enum tc_matchall_command { TC_CLSMATCHALL_REPLACE, TC_CLSMATCHALL_DESTROY, }; struct tc_cls_matchall_offload { struct tc_cls_common_offload common; enum tc_matchall_command command; struct tcf_exts *exts; unsigned long cookie; }; enum tc_clsbpf_command { TC_CLSBPF_OFFLOAD, TC_CLSBPF_STATS, }; struct tc_cls_bpf_offload { struct tc_cls_common_offload common; enum tc_clsbpf_command command; struct tcf_exts *exts; struct bpf_prog *prog; struct bpf_prog *oldprog; const char *name; bool exts_integrated; }; struct tc_mqprio_qopt_offload { /* struct tc_mqprio_qopt must always be the first element */ struct tc_mqprio_qopt qopt; u16 mode; u16 shaper; u32 flags; u64 min_rate[TC_QOPT_MAX_QUEUE]; u64 max_rate[TC_QOPT_MAX_QUEUE]; }; /* This structure holds cookie structure that is passed from user * to the kernel for actions and classifiers */ struct tc_cookie { u8 *data; u32 len; }; struct tc_qopt_offload_stats { struct gnet_stats_basic_packed *bstats; struct gnet_stats_queue *qstats; }; enum tc_red_command { TC_RED_REPLACE, TC_RED_DESTROY, TC_RED_STATS, TC_RED_XSTATS, }; struct tc_red_qopt_offload_params { u32 min; u32 max; u32 probability; bool is_ecn; struct gnet_stats_queue *qstats; }; struct tc_red_qopt_offload { enum tc_red_command command; u32 handle; u32 parent; union { struct tc_red_qopt_offload_params set; struct tc_qopt_offload_stats stats; struct red_stats *xstats; }; }; enum tc_prio_command { TC_PRIO_REPLACE, TC_PRIO_DESTROY, TC_PRIO_STATS, }; struct tc_prio_qopt_offload_params { int bands; u8 priomap[TC_PRIO_MAX + 1]; /* In case that a prio qdisc is offloaded and now is changed to a * non-offloadedable config, it needs to update the backlog & qlen * values to negate the HW backlog & qlen values (and only them). */ struct gnet_stats_queue *qstats; }; struct tc_prio_qopt_offload { enum tc_prio_command command; u32 handle; u32 parent; union { struct tc_prio_qopt_offload_params replace_params; struct tc_qopt_offload_stats stats; }; }; #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Jiri Pirko90129.84%2223.66%
David S. Miller53817.82%55.38%
Thomas Graf36011.92%55.38%
Américo Wang31610.47%1111.83%
Jakub Kiciński2428.02%77.53%
Nogah Frankel1354.47%33.23%
John Fastabend1073.54%55.38%
Sridhar Samudrala652.15%11.08%
Linus Torvalds (pre-git)612.02%11.08%
Quentin Monnet511.69%33.23%
Amir Vadai431.42%33.23%
Amritha Nambiar341.13%22.15%
Alexander Aring290.96%33.23%
Yotam Gigi260.86%11.08%
Hadar Hen Zion230.76%22.15%
Or Gerlitz210.70%11.08%
Patrick McHardy180.60%44.30%
Jamal Hadi Salim130.43%11.08%
Arnaldo Carvalho de Melo120.40%44.30%
Sudip Mukherjee50.17%11.08%
Benjamin LaHaise50.17%11.08%
Wolfgang Bumiller30.10%11.08%
Denis V. Lunev30.10%11.08%
Cong Wang30.10%11.08%
Eric Dumazet20.07%11.08%
Alexey Dobriyan10.03%11.08%
Daniel Borkmann10.03%11.08%
Greg Kroah-Hartman10.03%11.08%
Total3019100.00%93100.00%
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