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a14bc59f | 1 | /* |
e23775f2 | 2 | * Copyright (c) 2007-2015 Nicira, Inc. |
a14bc59f | 3 | * |
a9a29d22 JG |
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 | |
a14bc59f BP |
17 | */ |
18 | ||
064af421 BP |
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> | |
064af421 | 25 | #include <linux/netdevice.h> |
064af421 | 26 | #include <linux/skbuff.h> |
821cb9fa | 27 | #include <linux/u64_stats_sync.h> |
c0cddcec | 28 | #include <net/net_namespace.h> |
e23775f2 | 29 | #include <net/ip_tunnels.h> |
dd8d6b8c | 30 | |
9cb8d24d | 31 | #include "compat.h" |
2a4999f3 | 32 | #include "flow.h" |
a097c0b2 | 33 | #include "flow_table.h" |
e02b6f81 | 34 | #include "meter.h" |
b68abe0f | 35 | #include "vport-internal_dev.h" |
f2459fe7 | 36 | |
7d16c847 PS |
37 | #define DP_MAX_PORTS USHRT_MAX |
38 | #define DP_VPORT_HASH_BUCKETS 1024 | |
95b1d73a | 39 | |
67a78abe BP |
40 | /** |
41 | * struct dp_stats_percpu - per-cpu packet processing statistics for a given | |
42 | * datapath. | |
67a78abe BP |
43 | * @n_hit: Number of received packets for which a matching flow was found in |
44 | * the flow table. | |
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). | |
4fa72a95 AZ |
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 | |
53 | * up per packet. | |
67a78abe | 54 | */ |
064af421 | 55 | struct dp_stats_percpu { |
064af421 BP |
56 | u64 n_hit; |
57 | u64 n_missed; | |
58 | u64 n_lost; | |
4fa72a95 | 59 | u64 n_mask_hit; |
b81deb15 | 60 | struct u64_stats_sync syncp; |
064af421 BP |
61 | }; |
62 | ||
72b06300 BP |
63 | /** |
64 | * struct datapath - datapath for flow-based packet switching | |
46c6a11d | 65 | * @rcu: RCU callback head for deferred destruction. |
254f2dc8 | 66 | * @list_node: Element in global 'dps' list. |
994dc286 | 67 | * @table: flow table. |
95b1d73a | 68 | * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by |
cd2a59e9 | 69 | * ovs_mutex and RCU. |
72b06300 | 70 | * @stats_percpu: Per-CPU datapath statistics. |
2a4999f3 | 71 | * @net: Reference to net namespace. |
8ce37339 PS |
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. | |
ed099e92 BP |
74 | * |
75 | * Context: See the comment on locking at the top of datapath.c for additional | |
76 | * locking information. | |
72b06300 | 77 | */ |
064af421 | 78 | struct datapath { |
46c6a11d | 79 | struct rcu_head rcu; |
254f2dc8 | 80 | struct list_head list_node; |
064af421 | 81 | |
064af421 | 82 | /* Flow table. */ |
994dc286 | 83 | struct flow_table table; |
064af421 | 84 | |
064af421 | 85 | /* Switch ports. */ |
95b1d73a | 86 | struct hlist_head *ports; |
064af421 BP |
87 | |
88 | /* Stats. */ | |
d3097eff | 89 | struct dp_stats_percpu __percpu *stats_percpu; |
2a4999f3 | 90 | |
2a4999f3 | 91 | /* Network namespace ref. */ |
c0cddcec | 92 | possible_net_t net; |
c58cc9a4 TG |
93 | |
94 | u32 user_features; | |
8ce37339 PS |
95 | |
96 | u32 max_headroom; | |
1cb57039 AZ |
97 | |
98 | /* Switch meters. */ | |
99 | struct hlist_head *meters; | |
064af421 BP |
100 | }; |
101 | ||
a063b0df JG |
102 | /** |
103 | * struct ovs_skb_cb - OVS data in skb CB | |
a6059080 AZ |
104 | * @input_vport: The original vport packet came in on. This value is cached |
105 | * when a packet is received by OVS. | |
a94ebc39 JS |
106 | * @mru: The maximum received fragement size; 0 if the packet is not |
107 | * fragmented. | |
6b330a60 | 108 | * @acts_origlen: The netlink size of the flow actions applied to this skb. |
dc154abc | 109 | * @cutlen: The number of bytes from the packet end to be removed. |
a063b0df JG |
110 | */ |
111 | struct ovs_skb_cb { | |
ad50cb60 | 112 | struct vport *input_vport; |
a94ebc39 | 113 | u16 mru; |
6b330a60 | 114 | u16 acts_origlen; |
4c7804f1 | 115 | u32 cutlen; |
a063b0df JG |
116 | }; |
117 | #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) | |
118 | ||
856081f6 BP |
119 | /** |
120 | * struct dp_upcall - metadata to include with a packet to send to userspace | |
df2c07f4 | 121 | * @cmd: One of %OVS_PACKET_CMD_*. |
e995e3df | 122 | * @userdata: If nonnull, its variable-length value is passed to userspace as |
98403001 | 123 | * %OVS_PACKET_ATTR_USERDATA. |
7d16c847 PS |
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 | |
98403001 | 126 | * counter. |
8b7ea2d4 | 127 | * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. |
a94ebc39 | 128 | * @mru: If not zero, Maximum received IP fragment size. |
6ff686f2 | 129 | */ |
856081f6 | 130 | struct dp_upcall_info { |
e23775f2 | 131 | struct ip_tunnel_info *egress_tun_info; |
98403001 | 132 | const struct nlattr *userdata; |
0e469d3b NM |
133 | const struct nlattr *actions; |
134 | int actions_len; | |
28aea917 | 135 | u32 portid; |
9b277b39 | 136 | u8 cmd; |
a94ebc39 | 137 | u16 mru; |
856081f6 BP |
138 | }; |
139 | ||
2a4999f3 PS |
140 | /** |
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. | |
2a4999f3 PS |
144 | */ |
145 | struct ovs_net { | |
146 | struct list_head dps; | |
cd2a59e9 | 147 | struct work_struct dp_notify_work; |
cb2a5486 YHW |
148 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
149 | struct ovs_ct_limit_info *ct_limit_info; | |
150 | #endif | |
038e34ab JS |
151 | |
152 | /* Module reference for configuring conntrack. */ | |
153 | bool xt_label; | |
7f4a5d68 | 154 | |
155 | #ifdef HAVE_INET_FRAG_LRU_MOVE | |
156 | struct net *net; | |
157 | struct netns_frags ipv4_frags; | |
158 | struct netns_frags nf_frags; | |
159 | #endif | |
2a4999f3 PS |
160 | }; |
161 | ||
f56f0b73 | 162 | extern unsigned int ovs_net_id; |
cd2a59e9 PS |
163 | void ovs_lock(void); |
164 | void ovs_unlock(void); | |
165 | ||
166 | #ifdef CONFIG_LOCKDEP | |
167 | int lockdep_ovsl_is_held(void); | |
168 | #else | |
169 | #define lockdep_ovsl_is_held() 1 | |
170 | #endif | |
171 | ||
a6c2d4cb | 172 | #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) |
cd2a59e9 PS |
173 | #define ovsl_dereference(p) \ |
174 | rcu_dereference_protected(p, lockdep_ovsl_is_held()) | |
780ec6ae JG |
175 | #define rcu_dereference_ovsl(p) \ |
176 | rcu_dereference_check(p, lockdep_ovsl_is_held()) | |
2a4999f3 | 177 | |
f1f60b85 | 178 | static inline struct net *ovs_dp_get_net(const struct datapath *dp) |
2a4999f3 | 179 | { |
c0cddcec | 180 | return rpl_read_pnet(&dp->net); |
2a4999f3 PS |
181 | } |
182 | ||
183 | static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) | |
184 | { | |
c0cddcec | 185 | rpl_write_pnet(&dp->net, net); |
2a4999f3 PS |
186 | } |
187 | ||
95b1d73a PS |
188 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); |
189 | ||
190 | static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) | |
191 | { | |
192 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
193 | return ovs_lookup_vport(dp, port_no); | |
194 | } | |
195 | ||
cd2a59e9 | 196 | static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) |
95b1d73a | 197 | { |
cd2a59e9 | 198 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); |
95b1d73a PS |
199 | return ovs_lookup_vport(dp, port_no); |
200 | } | |
201 | ||
cd2a59e9 | 202 | static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) |
95b1d73a | 203 | { |
cd2a59e9 | 204 | ASSERT_OVSL(); |
95b1d73a PS |
205 | return ovs_lookup_vport(dp, port_no); |
206 | } | |
207 | ||
b68abe0f AZ |
208 | /* Must be called with rcu_read_lock. */ |
209 | static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) | |
210 | { | |
211 | struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); | |
212 | ||
213 | if (dev) { | |
214 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
215 | ||
216 | if (vport) | |
217 | return vport->dp; | |
218 | } | |
219 | ||
220 | return NULL; | |
221 | } | |
222 | ||
223 | /* The caller must hold either ovs_mutex or rcu_read_lock to keep the | |
224 | * returned dp pointer valid. | |
225 | */ | |
226 | static inline struct datapath *get_dp(struct net *net, int dp_ifindex) | |
227 | { | |
228 | struct datapath *dp; | |
229 | ||
230 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); | |
231 | rcu_read_lock(); | |
232 | dp = get_dp_rcu(net, dp_ifindex); | |
233 | rcu_read_unlock(); | |
234 | ||
235 | return dp; | |
236 | } | |
237 | ||
850b6b3b | 238 | extern struct notifier_block ovs_dp_device_notifier; |
cb25142c | 239 | extern struct genl_family dp_vport_genl_family; |
18fd3a52 | 240 | extern struct genl_multicast_group ovs_dp_vport_multicast_group; |
064af421 | 241 | |
7d16c847 | 242 | void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); |
850b6b3b JG |
243 | void ovs_dp_detach_port(struct vport *); |
244 | int ovs_dp_upcall(struct datapath *, struct sk_buff *, | |
4c7804f1 WT |
245 | const struct sw_flow_key *, const struct dp_upcall_info *, |
246 | uint32_t cutlen); | |
064af421 | 247 | |
850b6b3b | 248 | const char *ovs_dp_name(const struct datapath *dp); |
b147f2e9 JB |
249 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, |
250 | u32 portid, u32 seq, u8 cmd); | |
064af421 | 251 | |
ad50cb60 | 252 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
7d16c847 PS |
253 | const struct sw_flow_actions *, struct sw_flow_key *); |
254 | ||
cd2a59e9 | 255 | void ovs_dp_notify_wq(struct work_struct *work); |
1b936472 | 256 | |
2c8c4fb7 AZ |
257 | int action_fifos_init(void); |
258 | void action_fifos_exit(void); | |
259 | ||
e281bb23 JS |
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)) | |
263 | ||
9233cef7 | 264 | #define OVS_NLERR(logging_allowed, fmt, ...) \ |
13fe6842 | 265 | do { \ |
9233cef7 JR |
266 | if (logging_allowed && net_ratelimit()) \ |
267 | pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ | |
13fe6842 | 268 | } while (0) |
064af421 | 269 | #endif /* datapath.h */ |