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 */ 41 struct 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 */ 64 struct 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 */ 97 struct 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 */ 116 struct 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 */ 131 struct 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 }; 141 142 extern unsigned int ovs_net_id; 143 void ovs_lock(void); 144 void ovs_unlock(void); 145 146 #ifdef CONFIG_LOCKDEP 147 int 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()) 157 158 static inline struct net *ovs_dp_get_net(const struct datapath *dp) 159 { 160 return read_pnet(&dp->net); 161 } 162 163 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) 164 { 165 write_pnet(&dp->net, net); 166 } 167 168 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); 169 170 static 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 } 175 176 static 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 } 181 182 static 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. */ 189 static 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 */ 206 static 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 } 217 218 extern struct notifier_block ovs_dp_device_notifier; 219 extern struct genl_family dp_vport_genl_family; 220 221 DECLARE_STATIC_KEY_FALSE(tc_recirc_sharing_support); 222 223 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); 224 void ovs_dp_detach_port(struct vport *); 225 int ovs_dp_upcall(struct datapath *, struct sk_buff *, 226 const struct sw_flow_key *, const struct dp_upcall_info *, 227 uint32_t cutlen); 228 229 const char *ovs_dp_name(const struct datapath *dp); 230 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 231 u32 portid, u32 seq, u8 cmd); 232 233 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, 234 const struct sw_flow_actions *, struct sw_flow_key *); 235 236 void ovs_dp_notify_wq(struct work_struct *work); 237 238 int action_fifos_init(void); 239 void action_fifos_exit(void); 240 241 /* 'KEY' must not have any bits set outside of the 'MASK' */ 242 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) 243 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) 244 245 #define OVS_NLERR(logging_allowed, fmt, ...) \ 246 do { \ 247 if (logging_allowed && net_ratelimit()) \ 248 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ 249 } while (0) 250 #endif /* datapath.h */ 251