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#ifndef DATAPATH_H#define DATAPATH_H 1
#include <asm/page.h>#include <linux/kernel.h>#include <linux/mutex.h>#include <linux/netdevice.h>#include <linux/skbuff.h>#include <linux/u64_stats_sync.h>#include <net/ip_tunnels.h>#include <net/mpls.h>
#include "conntrack.h"#include "flow.h"#include "flow_table.h"#include "meter.h"#include "vport-internal_dev.h"
#define DP_MAX_PORTS USHRT_MAX#define DP_VPORT_HASH_BUCKETS 1024#define DP_MASKS_REBALANCE_INTERVAL 4000
/** * struct dp_stats_percpu - per-cpu packet processing statistics for a given * datapath. * @n_hit: Number of received packets for which a matching flow was found in * the flow table. * @n_missed: Number of received packets that had no matching flow in the flow * table. The sum of @n_hit and @n_missed is the number of packets that have * been received by the datapath. * @n_lost: Number of received packets that had no matching flow in the flow * table that could not be sent to userspace (normally due to an overflow in * one of the datapath's queues). * @n_mask_hit: Number of masks looked up for flow match. * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked * up per packet. * @n_cache_hit: The number of received packets that had their mask found using * the mask cache. * @syncp: Synchronization point for 64bit counters. */struct dp_stats_percpu { u64 n_hit; u64 n_missed; u64 n_lost; u64 n_mask_hit; u64 n_cache_hit; struct u64_stats_sync syncp;};
/** * struct dp_nlsk_pids - array of netlink portids of for a datapath. * This is used when OVS_DP_F_DISPATCH_UPCALL_PER_CPU * is enabled and must be protected by rcu. * @rcu: RCU callback head for deferred destruction. * @n_pids: Size of @pids array. * @pids: Array storing the Netlink socket PIDs indexed by CPU ID for packets * that miss the flow table. */struct dp_nlsk_pids { struct rcu_head rcu; u32 n_pids; u32 pids[];};
/** * struct datapath - datapath for flow-based packet switching * @rcu: RCU callback head for deferred destruction. * @list_node: Element in global 'dps' list. * @table: flow table. * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by * ovs_mutex and RCU. * @stats_percpu: Per-CPU datapath statistics. * @net: Reference to net namespace. * @user_features: Bitmap of enabled %OVS_DP_F_* features. * @max_headroom: The maximum headroom of all vports in this datapath; it will * be used by all the internal vports in this dp. * @meter_tbl: Meter table. * @upcall_portids: RCU protected 'struct dp_nlsk_pids'. * * Context: See the comment on locking at the top of datapath.c for additional * locking information. */struct datapath { struct rcu_head rcu; struct list_head list_node;
/* Flow table. */ struct flow_table table;
/* Switch ports. */ struct hlist_head *ports;
/* Stats. */ struct dp_stats_percpu __percpu *stats_percpu;
/* Network namespace ref. */ possible_net_t net;
u32 user_features;
u32 max_headroom;
/* Switch meters. */ struct dp_meter_table meter_tbl;
struct dp_nlsk_pids __rcu *upcall_portids;};
/** * struct ovs_skb_cb - OVS data in skb CB * @input_vport: The original vport packet came in on. This value is cached * when a packet is received by OVS. * @mru: The maximum received fragement size; 0 if the packet is not * fragmented. * @acts_origlen: The netlink size of the flow actions applied to this skb. * @cutlen: The number of bytes in the packet to preserve on output. * @probability: The sampling probability that was applied to this skb; 0 means * no sampling has occurred; U32_MAX means 100% probability. * @upcall_pid: Netlink socket PID to use for sending this packet to userspace; * 0 means "not set" and default per-CPU or per-vport dispatch should be used. */struct ovs_skb_cb { struct vport *input_vport; u16 mru; u16 acts_origlen; u32 cutlen; u32 probability; u32 upcall_pid;};#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
/** * struct dp_upcall_info - metadata to include with a packet sent to userspace * @cmd: One of %OVS_PACKET_CMD_*. * @userdata: If nonnull, its variable-length value is passed to userspace as * %OVS_PACKET_ATTR_USERDATA. * @actions: If nonnull, its variable-length value is passed to userspace as * %OVS_PACKET_ATTR_ACTIONS. * @actions_len: The length of the @actions. * @portid: Netlink portid to which packet should be sent. If @portid is 0 * then no packet is sent and the packet is accounted in the datapath's @n_lost * counter. * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. * @mru: If not zero, Maximum received IP fragment size. */struct dp_upcall_info { struct ip_tunnel_info *egress_tun_info; const struct nlattr *userdata; const struct nlattr *actions; int actions_len; u32 portid; u8 cmd; u16 mru;};
/** * struct ovs_net - Per net-namespace data for ovs. * @dps: List of datapaths to enable dumping them all out. * Protected by genl_mutex. * @dp_notify_work: A work notifier to handle port unregistering. * @masks_rebalance: A work to periodically optimize flow table caches. * @ct_limit_info: A hash table of conntrack zone connection limits. * @xt_label: Whether connlables are configured for the network or not. */struct ovs_net { struct list_head dps; struct work_struct dp_notify_work; struct delayed_work masks_rebalance;#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) struct ovs_ct_limit_info *ct_limit_info;#endif bool xt_label;};
#define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)struct ovs_frag_data { unsigned long dst; struct vport *vport; struct ovs_skb_cb cb; __be16 inner_protocol; u16 network_offset; /* valid only for MPLS */ u16 vlan_tci; __be16 vlan_proto; unsigned int l2_len; u8 mac_proto; u8 l2_data[MAX_L2_LEN];};
struct deferred_action { struct sk_buff *skb; const struct nlattr *actions; int actions_len;
/* Store pkt_key clone when creating deferred action. */ struct sw_flow_key pkt_key;};
#define DEFERRED_ACTION_FIFO_SIZE 10#define OVS_RECURSION_LIMIT 5#define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
struct action_fifo { int head; int tail; /* Deferred action fifo queue storage. */ struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];};
struct action_flow_keys { struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];};
struct ovs_pcpu_storage { struct action_fifo action_fifos; struct action_flow_keys flow_keys; struct ovs_frag_data frag_data; int exec_level; struct task_struct *owner; local_lock_t bh_lock;};
extern struct ovs_pcpu_storage __percpu *ovs_pcpu_storage;
/** * enum ovs_pkt_hash_types - hash info to include with a packet * to send to userspace. * @OVS_PACKET_HASH_SW_BIT: indicates hash was computed in software stack. * @OVS_PACKET_HASH_L4_BIT: indicates hash is a canonical 4-tuple hash * over transport ports. */enum ovs_pkt_hash_types { OVS_PACKET_HASH_SW_BIT = (1ULL << 32), OVS_PACKET_HASH_L4_BIT = (1ULL << 33),};
extern unsigned int ovs_net_id;void ovs_lock(void);void ovs_unlock(void);
#ifdef CONFIG_LOCKDEPint lockdep_ovsl_is_held(void);#else#define lockdep_ovsl_is_held() 1#endif
#define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())#define ovsl_dereference(p) \ rcu_dereference_protected(p, lockdep_ovsl_is_held())#define rcu_dereference_ovsl(p) \ rcu_dereference_check(p, lockdep_ovsl_is_held())
static inline struct net *ovs_dp_get_net(const struct datapath *dp){ return read_pnet(&dp->net);}
static inline void ovs_dp_set_net(struct datapath *dp, struct net *net){ write_pnet(&dp->net, net);}
struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no){ WARN_ON_ONCE(!rcu_read_lock_held()); return ovs_lookup_vport(dp, port_no);}
static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no){ WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); return ovs_lookup_vport(dp, port_no);}
static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no){ ASSERT_OVSL(); return ovs_lookup_vport(dp, port_no);}
/* Must be called with rcu_read_lock. */static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex){ struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
if (dev) { struct vport *vport = ovs_internal_dev_get_vport(dev);
if (vport) return vport->dp; }
return NULL;}
/* The caller must hold either ovs_mutex or rcu_read_lock to keep the * returned dp pointer valid. */static inline struct datapath *get_dp(struct net *net, int dp_ifindex){ struct datapath *dp;
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); rcu_read_lock(); dp = get_dp_rcu(net, dp_ifindex); rcu_read_unlock();
return dp;}
extern struct notifier_block ovs_dp_device_notifier;extern struct genl_family dp_vport_genl_family;
void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);void ovs_dp_detach_port(struct vport *);int ovs_dp_upcall(struct datapath *, struct sk_buff *, const struct sw_flow_key *, const struct dp_upcall_info *, uint32_t cutlen);
u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id);
const char *ovs_dp_name(const struct datapath *dp);struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, u32 portid, u32 seq, u8 cmd);
int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, const struct sw_flow_actions *, struct sw_flow_key *);
void ovs_dp_notify_wq(struct work_struct *work);
/* 'KEY' must not have any bits set outside of the 'MASK' */#define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))#define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
#define OVS_NLERR(logging_allowed, fmt, ...) \do { \ if (logging_allowed && net_ratelimit()) \ pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \} while (0)#endif /* datapath.h */