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TOMOYO Linux Cross Reference
Linux/net/openvswitch/datapath.h

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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  */
 54 struct 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  */
 77 struct 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  */
110 struct 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  */
129 struct 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  */
144 struct ovs_net {
145         struct list_head dps;
146         struct work_struct dp_notify_work;
147 
148         /* Module reference for configuring conntrack. */
149         bool xt_label;
150 };
151 
152 extern unsigned int ovs_net_id;
153 void ovs_lock(void);
154 void ovs_unlock(void);
155 
156 #ifdef CONFIG_LOCKDEP
157 int lockdep_ovsl_is_held(void);
158 #else
159 #define lockdep_ovsl_is_held()  1
160 #endif
161 
162 #define ASSERT_OVSL()           WARN_ON(!lockdep_ovsl_is_held())
163 #define ovsl_dereference(p)                                     \
164         rcu_dereference_protected(p, lockdep_ovsl_is_held())
165 #define rcu_dereference_ovsl(p)                                 \
166         rcu_dereference_check(p, lockdep_ovsl_is_held())
167 
168 static inline struct net *ovs_dp_get_net(const struct datapath *dp)
169 {
170         return read_pnet(&dp->net);
171 }
172 
173 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
174 {
175         write_pnet(&dp->net, net);
176 }
177 
178 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
179 
180 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no)
181 {
182         WARN_ON_ONCE(!rcu_read_lock_held());
183         return ovs_lookup_vport(dp, port_no);
184 }
185 
186 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
187 {
188         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
189         return ovs_lookup_vport(dp, port_no);
190 }
191 
192 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
193 {
194         ASSERT_OVSL();
195         return ovs_lookup_vport(dp, port_no);
196 }
197 
198 /* Must be called with rcu_read_lock. */
199 static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
200 {
201         struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
202 
203         if (dev) {
204                 struct vport *vport = ovs_internal_dev_get_vport(dev);
205 
206                 if (vport)
207                         return vport->dp;
208         }
209 
210         return NULL;
211 }
212 
213 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
214  * returned dp pointer valid.
215  */
216 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
217 {
218         struct datapath *dp;
219 
220         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
221         rcu_read_lock();
222         dp = get_dp_rcu(net, dp_ifindex);
223         rcu_read_unlock();
224 
225         return dp;
226 }
227 
228 extern struct notifier_block ovs_dp_device_notifier;
229 extern struct genl_family dp_vport_genl_family;
230 
231 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
232 void ovs_dp_detach_port(struct vport *);
233 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
234                   const struct sw_flow_key *, const struct dp_upcall_info *,
235                   uint32_t cutlen);
236 
237 const char *ovs_dp_name(const struct datapath *dp);
238 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
239                                          u32 portid, u32 seq, u8 cmd);
240 
241 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
242                         const struct sw_flow_actions *, struct sw_flow_key *);
243 
244 void ovs_dp_notify_wq(struct work_struct *work);
245 
246 int action_fifos_init(void);
247 void action_fifos_exit(void);
248 
249 /* 'KEY' must not have any bits set outside of the 'MASK' */
250 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
251 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
252 
253 #define OVS_NLERR(logging_allowed, fmt, ...)                    \
254 do {                                                            \
255         if (logging_allowed && net_ratelimit())                 \
256                 pr_info("netlink: " fmt "\n", ##__VA_ARGS__);   \
257 } while (0)
258 #endif /* datapath.h */
259 

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