2 * Copyright (c) 2007-2015 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include <linux/kernel.h>
24 #include <linux/mutex.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/u64_stats_sync.h>
28 #include <net/net_namespace.h>
29 #include <net/ip_tunnels.h>
33 #include "flow_table.h"
35 #include "vport-internal_dev.h"
37 #define DP_MAX_PORTS USHRT_MAX
38 #define DP_VPORT_HASH_BUCKETS 1024
41 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
43 * @n_hit: Number of received packets for which a matching flow was found in
45 * @n_miss: Number of received packets that had no matching flow in the flow
46 * table. The sum of @n_hit and @n_miss is the number of packets that have
47 * been received by the datapath.
48 * @n_lost: Number of received packets that had no matching flow in the flow
49 * table that could not be sent to userspace (normally due to an overflow in
50 * one of the datapath's queues).
51 * @n_mask_hit: Number of masks looked up for flow match.
52 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
55 struct dp_stats_percpu
{
60 struct u64_stats_sync syncp
;
64 * struct datapath - datapath for flow-based packet switching
65 * @rcu: RCU callback head for deferred destruction.
66 * @list_node: Element in global 'dps' list.
68 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
70 * @stats_percpu: Per-CPU datapath statistics.
71 * @net: Reference to net namespace.
72 * @max_headroom: the maximum headroom of all vports in this datapath; it will
73 * be used by all the internal vports in this dp.
75 * Context: See the comment on locking at the top of datapath.c for additional
76 * locking information.
80 struct list_head list_node
;
83 struct flow_table table
;
86 struct hlist_head
*ports
;
89 struct dp_stats_percpu __percpu
*stats_percpu
;
91 /* Network namespace ref. */
99 struct hlist_head
*meters
;
103 * struct ovs_skb_cb - OVS data in skb CB
104 * @input_vport: The original vport packet came in on. This value is cached
105 * when a packet is received by OVS.
106 * @mru: The maximum received fragement size; 0 if the packet is not
108 * @acts_origlen: The netlink size of the flow actions applied to this skb.
109 * @cutlen: The number of bytes from the packet end to be removed.
112 struct vport
*input_vport
;
117 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
120 * struct dp_upcall - metadata to include with a packet to send to userspace
121 * @cmd: One of %OVS_PACKET_CMD_*.
122 * @userdata: If nonnull, its variable-length value is passed to userspace as
123 * %OVS_PACKET_ATTR_USERDATA.
124 * @portid: Netlink portid to which packet should be sent. If @portid is 0
125 * then no packet is sent and the packet is accounted in the datapath's @n_lost
127 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
128 * @mru: If not zero, Maximum received IP fragment size.
130 struct dp_upcall_info
{
131 struct ip_tunnel_info
*egress_tun_info
;
132 const struct nlattr
*userdata
;
133 const struct nlattr
*actions
;
141 * struct ovs_net - Per net-namespace data for ovs.
142 * @dps: List of datapaths to enable dumping them all out.
143 * Protected by genl_mutex.
146 struct list_head dps
;
147 struct work_struct dp_notify_work
;
148 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
149 struct ovs_ct_limit_info
*ct_limit_info
;
152 /* Module reference for configuring conntrack. */
155 #ifdef HAVE_INET_FRAG_LRU_MOVE
157 struct netns_frags ipv4_frags
;
158 struct netns_frags nf_frags
;
162 extern unsigned int ovs_net_id
;
164 void ovs_unlock(void);
166 #ifdef CONFIG_LOCKDEP
167 int lockdep_ovsl_is_held(void);
169 #define lockdep_ovsl_is_held() 1
172 #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())
173 #define ovsl_dereference(p) \
174 rcu_dereference_protected(p, lockdep_ovsl_is_held())
175 #define rcu_dereference_ovsl(p) \
176 rcu_dereference_check(p, lockdep_ovsl_is_held())
178 static inline struct net
*ovs_dp_get_net(const struct datapath
*dp
)
180 return rpl_read_pnet(&dp
->net
);
183 static inline void ovs_dp_set_net(struct datapath
*dp
, struct net
*net
)
185 rpl_write_pnet(&dp
->net
, net
);
188 struct vport
*ovs_lookup_vport(const struct datapath
*dp
, u16 port_no
);
190 static inline struct vport
*ovs_vport_rcu(const struct datapath
*dp
, int port_no
)
192 WARN_ON_ONCE(!rcu_read_lock_held());
193 return ovs_lookup_vport(dp
, port_no
);
196 static inline struct vport
*ovs_vport_ovsl_rcu(const struct datapath
*dp
, int port_no
)
198 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
199 return ovs_lookup_vport(dp
, port_no
);
202 static inline struct vport
*ovs_vport_ovsl(const struct datapath
*dp
, int port_no
)
205 return ovs_lookup_vport(dp
, port_no
);
208 /* Must be called with rcu_read_lock. */
209 static inline struct datapath
*get_dp_rcu(struct net
*net
, int dp_ifindex
)
211 struct net_device
*dev
= dev_get_by_index_rcu(net
, dp_ifindex
);
214 struct vport
*vport
= ovs_internal_dev_get_vport(dev
);
223 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
224 * returned dp pointer valid.
226 static inline struct datapath
*get_dp(struct net
*net
, int dp_ifindex
)
230 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
232 dp
= get_dp_rcu(net
, dp_ifindex
);
238 extern struct notifier_block ovs_dp_device_notifier
;
239 extern struct genl_family dp_vport_genl_family
;
240 extern struct genl_multicast_group ovs_dp_vport_multicast_group
;
242 void ovs_dp_process_packet(struct sk_buff
*skb
, struct sw_flow_key
*key
);
243 void ovs_dp_detach_port(struct vport
*);
244 int ovs_dp_upcall(struct datapath
*, struct sk_buff
*,
245 const struct sw_flow_key
*, const struct dp_upcall_info
*,
248 const char *ovs_dp_name(const struct datapath
*dp
);
249 struct sk_buff
*ovs_vport_cmd_build_info(struct vport
*vport
, struct net
*net
,
250 u32 portid
, u32 seq
, u8 cmd
);
252 int ovs_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
253 const struct sw_flow_actions
*, struct sw_flow_key
*);
255 void ovs_dp_notify_wq(struct work_struct
*work
);
257 int action_fifos_init(void);
258 void action_fifos_exit(void);
260 /* 'KEY' must not have any bits set outside of the 'MASK' */
261 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
262 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
264 #define OVS_NLERR(logging_allowed, fmt, ...) \
266 if (logging_allowed && net_ratelimit()) \
267 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \
269 #endif /* datapath.h */