forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
287 lines
8.1 KiB
287 lines
8.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright (c) 2007-2014 Nicira, Inc. |
|
*/ |
|
|
|
#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 "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_miss: Number of received packets that had no matching flow in the flow |
|
* table. The sum of @n_hit and @n_miss 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. |
|
*/ |
|
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. |
|
* @max_headroom: the maximum headroom of all vports in this datapath; it will |
|
* be used by all the internal vports in this dp. |
|
* @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 from the packet end to be removed. |
|
*/ |
|
struct ovs_skb_cb { |
|
struct vport *input_vport; |
|
u16 mru; |
|
u16 acts_origlen; |
|
u32 cutlen; |
|
}; |
|
#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) |
|
|
|
/** |
|
* struct dp_upcall - metadata to include with a packet to send to userspace |
|
* @cmd: One of %OVS_PACKET_CMD_*. |
|
* @userdata: If nonnull, its variable-length value is passed to userspace as |
|
* %OVS_PACKET_ATTR_USERDATA. |
|
* @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. |
|
*/ |
|
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 |
|
|
|
/* Module reference for configuring conntrack. */ |
|
bool xt_label; |
|
}; |
|
|
|
/** |
|
* 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_LOCKDEP |
|
int 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; |
|
|
|
DECLARE_STATIC_KEY_FALSE(tc_recirc_sharing_support); |
|
|
|
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); |
|
|
|
int action_fifos_init(void); |
|
void action_fifos_exit(void); |
|
|
|
/* '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 */
|
|
|