Linux kernel mirror (for testing)
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1/*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
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.
7 *
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.
12 *
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
16 * 02110-1301, USA
17 */
18
19#ifndef DATAPATH_H
20#define DATAPATH_H 1
21
22#include <asm/page.h>
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/ip_tunnels.h>
29
30#include "conntrack.h"
31#include "flow.h"
32#include "flow_table.h"
33#include "meter.h"
34#include "vport-internal_dev.h"
35
36#define DP_MAX_PORTS USHRT_MAX
37#define DP_VPORT_HASH_BUCKETS 1024
38
39/**
40 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
41 * datapath.
42 * @n_hit: Number of received packets for which a matching flow was found in
43 * the flow table.
44 * @n_miss: Number of received packets that had no matching flow in the flow
45 * table. The sum of @n_hit and @n_miss is the number of packets that have
46 * been received by the datapath.
47 * @n_lost: Number of received packets that had no matching flow in the flow
48 * table that could not be sent to userspace (normally due to an overflow in
49 * one of the datapath's queues).
50 * @n_mask_hit: Number of masks looked up for flow match.
51 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
52 * up per packet.
53 */
54struct dp_stats_percpu {
55 u64 n_hit;
56 u64 n_missed;
57 u64 n_lost;
58 u64 n_mask_hit;
59 struct u64_stats_sync syncp;
60};
61
62/**
63 * struct datapath - datapath for flow-based packet switching
64 * @rcu: RCU callback head for deferred destruction.
65 * @list_node: Element in global 'dps' list.
66 * @table: flow table.
67 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by
68 * ovs_mutex and RCU.
69 * @stats_percpu: Per-CPU datapath statistics.
70 * @net: Reference to net namespace.
71 * @max_headroom: the maximum headroom of all vports in this datapath; it will
72 * be used by all the internal vports in this dp.
73 *
74 * Context: See the comment on locking at the top of datapath.c for additional
75 * locking information.
76 */
77struct datapath {
78 struct rcu_head rcu;
79 struct list_head list_node;
80
81 /* Flow table. */
82 struct flow_table table;
83
84 /* Switch ports. */
85 struct hlist_head *ports;
86
87 /* Stats. */
88 struct dp_stats_percpu __percpu *stats_percpu;
89
90 /* Network namespace ref. */
91 possible_net_t net;
92
93 u32 user_features;
94
95 u32 max_headroom;
96
97 /* Switch meters. */
98 struct hlist_head *meters;
99};
100
101/**
102 * struct ovs_skb_cb - OVS data in skb CB
103 * @input_vport: The original vport packet came in on. This value is cached
104 * when a packet is received by OVS.
105 * @mru: The maximum received fragement size; 0 if the packet is not
106 * fragmented.
107 * @acts_origlen: The netlink size of the flow actions applied to this skb.
108 * @cutlen: The number of bytes from the packet end to be removed.
109 */
110struct ovs_skb_cb {
111 struct vport *input_vport;
112 u16 mru;
113 u16 acts_origlen;
114 u32 cutlen;
115};
116#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
117
118/**
119 * struct dp_upcall - metadata to include with a packet to send to userspace
120 * @cmd: One of %OVS_PACKET_CMD_*.
121 * @userdata: If nonnull, its variable-length value is passed to userspace as
122 * %OVS_PACKET_ATTR_USERDATA.
123 * @portid: Netlink portid to which packet should be sent. If @portid is 0
124 * then no packet is sent and the packet is accounted in the datapath's @n_lost
125 * counter.
126 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
127 * @mru: If not zero, Maximum received IP fragment size.
128 */
129struct dp_upcall_info {
130 struct ip_tunnel_info *egress_tun_info;
131 const struct nlattr *userdata;
132 const struct nlattr *actions;
133 int actions_len;
134 u32 portid;
135 u8 cmd;
136 u16 mru;
137};
138
139/**
140 * struct ovs_net - Per net-namespace data for ovs.
141 * @dps: List of datapaths to enable dumping them all out.
142 * Protected by genl_mutex.
143 */
144struct ovs_net {
145 struct list_head dps;
146 struct work_struct dp_notify_work;
147#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
148 struct ovs_ct_limit_info *ct_limit_info;
149#endif
150
151 /* Module reference for configuring conntrack. */
152 bool xt_label;
153};
154
155extern unsigned int ovs_net_id;
156void ovs_lock(void);
157void ovs_unlock(void);
158
159#ifdef CONFIG_LOCKDEP
160int lockdep_ovsl_is_held(void);
161#else
162#define lockdep_ovsl_is_held() 1
163#endif
164
165#define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held())
166#define ovsl_dereference(p) \
167 rcu_dereference_protected(p, lockdep_ovsl_is_held())
168#define rcu_dereference_ovsl(p) \
169 rcu_dereference_check(p, lockdep_ovsl_is_held())
170
171static inline struct net *ovs_dp_get_net(const struct datapath *dp)
172{
173 return read_pnet(&dp->net);
174}
175
176static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
177{
178 write_pnet(&dp->net, net);
179}
180
181struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
182
183static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
184{
185 WARN_ON_ONCE(!rcu_read_lock_held());
186 return ovs_lookup_vport(dp, port_no);
187}
188
189static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
190{
191 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
192 return ovs_lookup_vport(dp, port_no);
193}
194
195static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
196{
197 ASSERT_OVSL();
198 return ovs_lookup_vport(dp, port_no);
199}
200
201/* Must be called with rcu_read_lock. */
202static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
203{
204 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
205
206 if (dev) {
207 struct vport *vport = ovs_internal_dev_get_vport(dev);
208
209 if (vport)
210 return vport->dp;
211 }
212
213 return NULL;
214}
215
216/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
217 * returned dp pointer valid.
218 */
219static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
220{
221 struct datapath *dp;
222
223 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
224 rcu_read_lock();
225 dp = get_dp_rcu(net, dp_ifindex);
226 rcu_read_unlock();
227
228 return dp;
229}
230
231extern struct notifier_block ovs_dp_device_notifier;
232extern struct genl_family dp_vport_genl_family;
233
234void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
235void ovs_dp_detach_port(struct vport *);
236int ovs_dp_upcall(struct datapath *, struct sk_buff *,
237 const struct sw_flow_key *, const struct dp_upcall_info *,
238 uint32_t cutlen);
239
240const char *ovs_dp_name(const struct datapath *dp);
241struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
242 u32 portid, u32 seq, u8 cmd);
243
244int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
245 const struct sw_flow_actions *, struct sw_flow_key *);
246
247void ovs_dp_notify_wq(struct work_struct *work);
248
249int action_fifos_init(void);
250void action_fifos_exit(void);
251
252/* 'KEY' must not have any bits set outside of the 'MASK' */
253#define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
254#define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
255
256#define OVS_NLERR(logging_allowed, fmt, ...) \
257do { \
258 if (logging_allowed && net_ratelimit()) \
259 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \
260} while (0)
261#endif /* datapath.h */