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 #define DP_MASKS_REBALANCE_INTERVAL 4000 26 27 /** 28 * struct dp_stats_percpu - per-cpu packet processing statistics for a given 29 * datapath. 30 * @n_hit: Number of received packets for which a matching flow was found in 31 * the flow table. 32 * @n_miss: Number of received packets that had no matching flow in the flow 33 * table. The sum of @n_hit and @n_miss is the number of packets that have 34 * been received by the datapath. 35 * @n_lost: Number of received packets that had no matching flow in the flow 36 * table that could not be sent to userspace (normally due to an overflow in 37 * one of the datapath's queues). 38 * @n_mask_hit: Number of masks looked up for flow match. 39 * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked 40 * up per packet. 41 * @n_cache_hit: The number of received packets that had their mask found using 42 * the mask cache. 43 */ 44 struct dp_stats_percpu { 45 u64 n_hit; 46 u64 n_missed; 47 u64 n_lost; 48 u64 n_mask_hit; 49 u64 n_cache_hit; 50 struct u64_stats_sync syncp; 51 }; 52 53 /** 54 * struct dp_nlsk_pids - array of netlink portids of for a datapath. 55 * This is used when OVS_DP_F_DISPATCH_UPCALL_PER_CPU 56 * is enabled and must be protected by rcu. 57 * @rcu: RCU callback head for deferred destruction. 58 * @n_pids: Size of @pids array. 59 * @pids: Array storing the Netlink socket PIDs indexed by CPU ID for packets 60 * that miss the flow table. 61 */ 62 struct dp_nlsk_pids { 63 struct rcu_head rcu; 64 u32 n_pids; 65 u32 pids[]; 66 }; 67 68 /** 69 * struct datapath - datapath for flow-based packet switching 70 * @rcu: RCU callback head for deferred destruction. 71 * @list_node: Element in global 'dps' list. 72 * @table: flow table. 73 * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by 74 * ovs_mutex and RCU. 75 * @stats_percpu: Per-CPU datapath statistics. 76 * @net: Reference to net namespace. 77 * @max_headroom: the maximum headroom of all vports in this datapath; it will 78 * be used by all the internal vports in this dp. 79 * @upcall_portids: RCU protected 'struct dp_nlsk_pids'. 80 * 81 * Context: See the comment on locking at the top of datapath.c for additional 82 * locking information. 83 */ 84 struct datapath { 85 struct rcu_head rcu; 86 struct list_head list_node; 87 88 /* Flow table. */ 89 struct flow_table table; 90 91 /* Switch ports. */ 92 struct hlist_head *ports; 93 94 /* Stats. */ 95 struct dp_stats_percpu __percpu *stats_percpu; 96 97 /* Network namespace ref. */ 98 possible_net_t net; 99 100 u32 user_features; 101 102 u32 max_headroom; 103 104 /* Switch meters. */ 105 struct dp_meter_table meter_tbl; 106 107 struct dp_nlsk_pids __rcu *upcall_portids; 108 }; 109 110 /** 111 * struct ovs_skb_cb - OVS data in skb CB 112 * @input_vport: The original vport packet came in on. This value is cached 113 * when a packet is received by OVS. 114 * @mru: The maximum received fragement size; 0 if the packet is not 115 * fragmented. 116 * @acts_origlen: The netlink size of the flow actions applied to this skb. 117 * @cutlen: The number of bytes from the packet end to be removed. 118 * @probability: The sampling probability that was applied to this skb; 0 means 119 * no sampling has occurred; U32_MAX means 100% probability. 120 */ 121 struct ovs_skb_cb { 122 struct vport *input_vport; 123 u16 mru; 124 u16 acts_origlen; 125 u32 cutlen; 126 u32 probability; 127 }; 128 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) 129 130 /** 131 * struct dp_upcall - metadata to include with a packet to send to userspace 132 * @cmd: One of %OVS_PACKET_CMD_*. 133 * @userdata: If nonnull, its variable-length value is passed to userspace as 134 * %OVS_PACKET_ATTR_USERDATA. 135 * @portid: Netlink portid to which packet should be sent. If @portid is 0 136 * then no packet is sent and the packet is accounted in the datapath's @n_lost 137 * counter. 138 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY. 139 * @mru: If not zero, Maximum received IP fragment size. 140 */ 141 struct dp_upcall_info { 142 struct ip_tunnel_info *egress_tun_info; 143 const struct nlattr *userdata; 144 const struct nlattr *actions; 145 int actions_len; 146 u32 portid; 147 u8 cmd; 148 u16 mru; 149 }; 150 151 /** 152 * struct ovs_net - Per net-namespace data for ovs. 153 * @dps: List of datapaths to enable dumping them all out. 154 * Protected by genl_mutex. 155 */ 156 struct ovs_net { 157 struct list_head dps; 158 struct work_struct dp_notify_work; 159 struct delayed_work masks_rebalance; 160 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 161 struct ovs_ct_limit_info *ct_limit_info; 162 #endif 163 }; 164 165 /** 166 * enum ovs_pkt_hash_types - hash info to include with a packet 167 * to send to userspace. 168 * @OVS_PACKET_HASH_SW_BIT: indicates hash was computed in software stack. 169 * @OVS_PACKET_HASH_L4_BIT: indicates hash is a canonical 4-tuple hash 170 * over transport ports. 171 */ 172 enum ovs_pkt_hash_types { 173 OVS_PACKET_HASH_SW_BIT = (1ULL << 32), 174 OVS_PACKET_HASH_L4_BIT = (1ULL << 33), 175 }; 176 177 extern unsigned int ovs_net_id; 178 void ovs_lock(void); 179 void ovs_unlock(void); 180 181 #ifdef CONFIG_LOCKDEP 182 int lockdep_ovsl_is_held(void); 183 #else 184 #define lockdep_ovsl_is_held() 1 185 #endif 186 187 #define ASSERT_OVSL() WARN_ON(!lockdep_ovsl_is_held()) 188 #define ovsl_dereference(p) \ 189 rcu_dereference_protected(p, lockdep_ovsl_is_held()) 190 #define rcu_dereference_ovsl(p) \ 191 rcu_dereference_check(p, lockdep_ovsl_is_held()) 192 193 static inline struct net *ovs_dp_get_net(const struct datapath *dp) 194 { 195 return read_pnet(&dp->net); 196 } 197 198 static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) 199 { 200 write_pnet(&dp->net, net); 201 } 202 203 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); 204 205 static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) 206 { 207 WARN_ON_ONCE(!rcu_read_lock_held()); 208 return ovs_lookup_vport(dp, port_no); 209 } 210 211 static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) 212 { 213 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 214 return ovs_lookup_vport(dp, port_no); 215 } 216 217 static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) 218 { 219 ASSERT_OVSL(); 220 return ovs_lookup_vport(dp, port_no); 221 } 222 223 /* Must be called with rcu_read_lock. */ 224 static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) 225 { 226 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); 227 228 if (dev) { 229 struct vport *vport = ovs_internal_dev_get_vport(dev); 230 231 if (vport) 232 return vport->dp; 233 } 234 235 return NULL; 236 } 237 238 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the 239 * returned dp pointer valid. 240 */ 241 static inline struct datapath *get_dp(struct net *net, int dp_ifindex) 242 { 243 struct datapath *dp; 244 245 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); 246 rcu_read_lock(); 247 dp = get_dp_rcu(net, dp_ifindex); 248 rcu_read_unlock(); 249 250 return dp; 251 } 252 253 extern struct notifier_block ovs_dp_device_notifier; 254 extern struct genl_family dp_vport_genl_family; 255 256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); 257 void ovs_dp_detach_port(struct vport *); 258 int ovs_dp_upcall(struct datapath *, struct sk_buff *, 259 const struct sw_flow_key *, const struct dp_upcall_info *, 260 uint32_t cutlen); 261 262 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id); 263 264 const char *ovs_dp_name(const struct datapath *dp); 265 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net, 266 u32 portid, u32 seq, u8 cmd); 267 268 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, 269 const struct sw_flow_actions *, struct sw_flow_key *); 270 271 void ovs_dp_notify_wq(struct work_struct *work); 272 273 int action_fifos_init(void); 274 void action_fifos_exit(void); 275 276 /* 'KEY' must not have any bits set outside of the 'MASK' */ 277 #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) 278 #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) 279 280 #define OVS_NLERR(logging_allowed, fmt, ...) \ 281 do { \ 282 if (logging_allowed && net_ratelimit()) \ 283 pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ 284 } while (0) 285 #endif /* datapath.h */ 286