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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6#ifndef DATAPATH_H
7#define DATAPATH_H 1
8
9#include <asm/page.h>
10#include <linux/kernel.h>
11#include <linux/mutex.h>
12#include <linux/netdevice.h>
13#include <linux/skbuff.h>
14#include <linux/u64_stats_sync.h>
15#include <net/ip_tunnels.h>
16
17#include "conntrack.h"
18#include "flow.h"
19#include "flow_table.h"
20#include "meter.h"
21#include "vport-internal_dev.h"
22
23#define DP_MAX_PORTS USHRT_MAX
24#define DP_VPORT_HASH_BUCKETS 1024
25
26/**
27 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
28 * datapath.
29 * @n_hit: Number of received packets for which a matching flow was found in
30 * the flow table.
31 * @n_miss: Number of received packets that had no matching flow in the flow
32 * table. The sum of @n_hit and @n_miss is the number of packets that have
33 * been received by the datapath.
34 * @n_lost: Number of received packets that had no matching flow in the flow
35 * table that could not be sent to userspace (normally due to an overflow in
36 * one of the datapath's queues).
37 * @n_mask_hit: Number of masks looked up for flow match.
38 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
39 * up per packet.
40 */
41struct dp_stats_percpu {
42 u64 n_hit;
43 u64 n_missed;
44 u64 n_lost;
45 u64 n_mask_hit;
46 struct u64_stats_sync syncp;
47};
48
49/**
50 * struct datapath - datapath for flow-based packet switching
51 * @rcu: RCU callback head for deferred destruction.
52 * @list_node: Element in global 'dps' list.
53 * @table: flow table.
54 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
55 * ovs_mutex and RCU.
56 * @stats_percpu: Per-CPU datapath statistics.
57 * @net: Reference to net namespace.
58 * @max_headroom: the maximum headroom of all vports in this datapath; it will
59 * be used by all the internal vports in this dp.
60 *
61 * Context: See the comment on locking at the top of datapath.c for additional
62 * locking information.
63 */
64struct datapath {
65 struct rcu_head rcu;
66 struct list_head list_node;
67
68 /* Flow table. */
69 struct flow_table table;
70
71 /* Switch ports. */
72 struct hlist_head *ports;
73
74 /* Stats. */
75 struct dp_stats_percpu __percpu *stats_percpu;
76
77 /* Network namespace ref. */
78 possible_net_t net;
79
80 u32 user_features;
81
82 u32 max_headroom;
83
84 /* Switch meters. */
85 struct hlist_head *meters;
86};
87
88/**
89 * struct ovs_skb_cb - OVS data in skb CB
90 * @input_vport: The original vport packet came in on. This value is cached
91 * when a packet is received by OVS.
92 * @mru: The maximum received fragement size; 0 if the packet is not
93 * fragmented.
94 * @acts_origlen: The netlink size of the flow actions applied to this skb.
95 * @cutlen: The number of bytes from the packet end to be removed.
96 */
97struct ovs_skb_cb {
98 struct vport *input_vport;
99 u16 mru;
100 u16 acts_origlen;
101 u32 cutlen;
102};
103#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
104
105/**
106 * struct dp_upcall - metadata to include with a packet to send to userspace
107 * @cmd: One of %OVS_PACKET_CMD_*.
108 * @userdata: If nonnull, its variable-length value is passed to userspace as
109 * %OVS_PACKET_ATTR_USERDATA.
110 * @portid: Netlink portid to which packet should be sent. If @portid is 0
111 * then no packet is sent and the packet is accounted in the datapath's @n_lost
112 * counter.
113 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
114 * @mru: If not zero, Maximum received IP fragment size.
115 */
116struct dp_upcall_info {
117 struct ip_tunnel_info *egress_tun_info;
118 const struct nlattr *userdata;
119 const struct nlattr *actions;
120 int actions_len;
121 u32 portid;
122 u8 cmd;
123 u16 mru;
124};
125
126/**
127 * struct ovs_net - Per net-namespace data for ovs.
128 * @dps: List of datapaths to enable dumping them all out.
129 * Protected by genl_mutex.
130 */
131struct ovs_net {
132 struct list_head dps;
133 struct work_struct dp_notify_work;
134#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
135 struct ovs_ct_limit_info *ct_limit_info;
136#endif
137
138 /* Module reference for configuring conntrack. */
139 bool xt_label;
140};
141
142extern unsigned int ovs_net_id;
143void ovs_lock(void);
144void ovs_unlock(void);
145
146#ifdef CONFIG_LOCKDEP
147int lockdep_ovsl_is_held(void);
148#else
149#define lockdep_ovsl_is_held() 1
150#endif
151
152#define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())
153#define ovsl_dereference(p) \
154 rcu_dereference_protected(p, lockdep_ovsl_is_held())
155#define rcu_dereference_ovsl(p) \
156 rcu_dereference_check(p, lockdep_ovsl_is_held())
157
158static inline struct net *ovs_dp_get_net(const struct datapath *dp)
159{
160 return read_pnet(&dp->net);
161}
162
163static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
164{
165 write_pnet(&dp->net, net);
166}
167
168struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
169
170static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
171{
172 WARN_ON_ONCE(!rcu_read_lock_held());
173 return ovs_lookup_vport(dp, port_no);
174}
175
176static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
177{
178 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
179 return ovs_lookup_vport(dp, port_no);
180}
181
182static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
183{
184 ASSERT_OVSL();
185 return ovs_lookup_vport(dp, port_no);
186}
187
188/* Must be called with rcu_read_lock. */
189static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
190{
191 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
192
193 if (dev) {
194 struct vport *vport = ovs_internal_dev_get_vport(dev);
195
196 if (vport)
197 return vport->dp;
198 }
199
200 return NULL;
201}
202
203/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
204 * returned dp pointer valid.
205 */
206static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
207{
208 struct datapath *dp;
209
210 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
211 rcu_read_lock();
212 dp = get_dp_rcu(net, dp_ifindex);
213 rcu_read_unlock();
214
215 return dp;
216}
217
218extern struct notifier_block ovs_dp_device_notifier;
219extern struct genl_family dp_vport_genl_family;
220
221void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
222void ovs_dp_detach_port(struct vport *);
223int ovs_dp_upcall(struct datapath *, struct sk_buff *,
224 const struct sw_flow_key *, const struct dp_upcall_info *,
225 uint32_t cutlen);
226
227const char *ovs_dp_name(const struct datapath *dp);
228struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
229 u32 portid, u32 seq, u8 cmd);
230
231int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
232 const struct sw_flow_actions *, struct sw_flow_key *);
233
234void ovs_dp_notify_wq(struct work_struct *work);
235
236int action_fifos_init(void);
237void action_fifos_exit(void);
238
239/* 'KEY' must not have any bits set outside of the 'MASK' */
240#define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
241#define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
242
243#define OVS_NLERR(logging_allowed, fmt, ...) \
244do { \
245 if (logging_allowed && net_ratelimit()) \
246 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \
247} while (0)
248#endif /* datapath.h */