1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * include/net/l3mdev.h - L3 master device API 4 * Copyright (c) 2015 Cumulus Networks 5 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> 6 */ 7 #ifndef _NET_L3MDEV_H_ 8 #define _NET_L3MDEV_H_ 9 10 #include <net/dst.h> 11 #include <net/fib_rules.h> 12 13 enum l3mdev_type { 14 L3MDEV_TYPE_UNSPEC, 15 L3MDEV_TYPE_VRF, 16 __L3MDEV_TYPE_MAX 17 }; 18 19 #define L3MDEV_TYPE_MAX (__L3MDEV_TYPE_MAX - 1) 20 21 typedef int (*lookup_by_table_id_t)(struct net *net, u32 table_d); 22 23 /** 24 * struct l3mdev_ops - l3mdev operations 25 * 26 * @l3mdev_fib_table: Get FIB table id to use for lookups 27 * 28 * @l3mdev_l3_rcv: Hook in L3 receive path 29 * 30 * @l3mdev_l3_out: Hook in L3 output path 31 * 32 * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations 33 */ 34 35 struct l3mdev_ops { 36 u32 (*l3mdev_fib_table)(const struct net_device *dev); 37 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, 38 struct sk_buff *skb, u16 proto); 39 struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev, 40 struct sock *sk, struct sk_buff *skb, 41 u16 proto); 42 43 /* IPv6 ops */ 44 struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev, 45 struct flowi6 *fl6); 46 }; 47 48 #ifdef CONFIG_NET_L3_MASTER_DEV 49 50 int l3mdev_table_lookup_register(enum l3mdev_type l3type, 51 lookup_by_table_id_t fn); 52 53 void l3mdev_table_lookup_unregister(enum l3mdev_type l3type, 54 lookup_by_table_id_t fn); 55 56 int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net, 57 u32 table_id); 58 59 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, 60 struct fib_lookup_arg *arg); 61 62 void l3mdev_update_flow(struct net *net, struct flowi *fl); 63 64 int l3mdev_master_ifindex_rcu(const struct net_device *dev); 65 static inline int l3mdev_master_ifindex(struct net_device *dev) 66 { 67 int ifindex; 68 69 rcu_read_lock(); 70 ifindex = l3mdev_master_ifindex_rcu(dev); 71 rcu_read_unlock(); 72 73 return ifindex; 74 } 75 76 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) 77 { 78 struct net_device *dev; 79 int rc = 0; 80 81 if (ifindex) { 82 rcu_read_lock(); 83 84 dev = dev_get_by_index_rcu(net, ifindex); 85 if (dev) 86 rc = l3mdev_master_ifindex_rcu(dev); 87 88 rcu_read_unlock(); 89 } 90 91 return rc; 92 } 93 94 static inline 95 struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev) 96 { 97 /* netdev_master_upper_dev_get_rcu calls 98 * list_first_or_null_rcu to walk the upper dev list. 99 * list_first_or_null_rcu does not handle a const arg. We aren't 100 * making changes, just want the master device from that list so 101 * typecast to remove the const 102 */ 103 struct net_device *dev = (struct net_device *)_dev; 104 struct net_device *master; 105 106 if (!dev) 107 return NULL; 108 109 if (netif_is_l3_master(dev)) 110 master = dev; 111 else if (netif_is_l3_slave(dev)) 112 master = netdev_master_upper_dev_get_rcu(dev); 113 else 114 master = NULL; 115 116 return master; 117 } 118 119 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex); 120 static inline 121 int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) 122 { 123 rcu_read_lock(); 124 ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex); 125 rcu_read_unlock(); 126 127 return ifindex; 128 } 129 130 u32 l3mdev_fib_table_rcu(const struct net_device *dev); 131 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); 132 static inline u32 l3mdev_fib_table(const struct net_device *dev) 133 { 134 u32 tb_id; 135 136 rcu_read_lock(); 137 tb_id = l3mdev_fib_table_rcu(dev); 138 rcu_read_unlock(); 139 140 return tb_id; 141 } 142 143 static inline bool netif_index_is_l3_master(struct net *net, int ifindex) 144 { 145 struct net_device *dev; 146 bool rc = false; 147 148 if (ifindex == 0) 149 return false; 150 151 rcu_read_lock(); 152 153 dev = dev_get_by_index_rcu(net, ifindex); 154 if (dev) 155 rc = netif_is_l3_master(dev); 156 157 rcu_read_unlock(); 158 159 return rc; 160 } 161 162 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6); 163 164 static inline 165 struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) 166 { 167 struct net_device *master = NULL; 168 169 if (netif_is_l3_slave(skb->dev)) 170 master = netdev_master_upper_dev_get_rcu(skb->dev); 171 else if (netif_is_l3_master(skb->dev) || 172 netif_has_l3_rx_handler(skb->dev)) 173 master = skb->dev; 174 175 if (master && master->l3mdev_ops->l3mdev_l3_rcv) 176 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); 177 178 return skb; 179 } 180 181 static inline 182 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) 183 { 184 return l3mdev_l3_rcv(skb, AF_INET); 185 } 186 187 static inline 188 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) 189 { 190 return l3mdev_l3_rcv(skb, AF_INET6); 191 } 192 193 static inline 194 struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto) 195 { 196 struct net_device *dev = skb_dst(skb)->dev; 197 198 if (netif_is_l3_slave(dev)) { 199 struct net_device *master; 200 201 rcu_read_lock(); 202 master = netdev_master_upper_dev_get_rcu(dev); 203 if (master && master->l3mdev_ops->l3mdev_l3_out) 204 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk, 205 skb, proto); 206 rcu_read_unlock(); 207 } 208 209 return skb; 210 } 211 212 static inline 213 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) 214 { 215 return l3mdev_l3_out(sk, skb, AF_INET); 216 } 217 218 static inline 219 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) 220 { 221 return l3mdev_l3_out(sk, skb, AF_INET6); 222 } 223 #else 224 225 static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) 226 { 227 return 0; 228 } 229 static inline int l3mdev_master_ifindex(struct net_device *dev) 230 { 231 return 0; 232 } 233 234 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) 235 { 236 return 0; 237 } 238 239 static inline 240 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex) 241 { 242 return 0; 243 } 244 static inline 245 int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) 246 { 247 return 0; 248 } 249 250 static inline 251 struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) 252 { 253 return NULL; 254 } 255 256 static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) 257 { 258 return 0; 259 } 260 static inline u32 l3mdev_fib_table(const struct net_device *dev) 261 { 262 return 0; 263 } 264 static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) 265 { 266 return 0; 267 } 268 269 static inline bool netif_index_is_l3_master(struct net *net, int ifindex) 270 { 271 return false; 272 } 273 274 static inline 275 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6) 276 { 277 return NULL; 278 } 279 280 static inline 281 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) 282 { 283 return skb; 284 } 285 286 static inline 287 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) 288 { 289 return skb; 290 } 291 292 static inline 293 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) 294 { 295 return skb; 296 } 297 298 static inline 299 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) 300 { 301 return skb; 302 } 303 304 static inline 305 int l3mdev_table_lookup_register(enum l3mdev_type l3type, 306 lookup_by_table_id_t fn) 307 { 308 return -EOPNOTSUPP; 309 } 310 311 static inline 312 void l3mdev_table_lookup_unregister(enum l3mdev_type l3type, 313 lookup_by_table_id_t fn) 314 { 315 } 316 317 static inline 318 int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net, 319 u32 table_id) 320 { 321 return -ENODEV; 322 } 323 324 static inline 325 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, 326 struct fib_lookup_arg *arg) 327 { 328 return 1; 329 } 330 static inline 331 void l3mdev_update_flow(struct net *net, struct flowi *fl) 332 { 333 } 334 #endif 335 336 #endif /* _NET_L3MDEV_H_ */ 337