1 /* 2 * include/net/l3mdev.h - L3 master device API 3 * Copyright (c) 2015 Cumulus Networks 4 * Copyright (c) 2015 David Ahern <[email protected]> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 #ifndef _NET_L3MDEV_H_ 12 #define _NET_L3MDEV_H_ 13 14 #include <net/dst.h> 15 #include <net/fib_rules.h> 16 17 /** 18 * struct l3mdev_ops - l3mdev operations 19 * 20 * @l3mdev_fib_table: Get FIB table id to use for lookups 21 * 22 * @l3mdev_l3_rcv: Hook in L3 receive path 23 * 24 * @l3mdev_l3_out: Hook in L3 output path 25 * 26 * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device 27 * 28 * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations 29 */ 30 31 struct l3mdev_ops { 32 u32 (*l3mdev_fib_table)(const struct net_device *dev); 33 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, 34 struct sk_buff *skb, u16 proto); 35 struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev, 36 struct sock *sk, struct sk_buff *skb, 37 u16 proto); 38 39 /* IPv4 ops */ 40 struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev, 41 const struct flowi4 *fl4); 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_fib_rule_match(struct net *net, struct flowi *fl, 51 struct fib_lookup_arg *arg); 52 53 void l3mdev_update_flow(struct net *net, struct flowi *fl); 54 55 int l3mdev_master_ifindex_rcu(const struct net_device *dev); 56 static inline int l3mdev_master_ifindex(struct net_device *dev) 57 { 58 int ifindex; 59 60 rcu_read_lock(); 61 ifindex = l3mdev_master_ifindex_rcu(dev); 62 rcu_read_unlock(); 63 64 return ifindex; 65 } 66 67 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) 68 { 69 struct net_device *dev; 70 int rc = 0; 71 72 if (likely(ifindex)) { 73 rcu_read_lock(); 74 75 dev = dev_get_by_index_rcu(net, ifindex); 76 if (dev) 77 rc = l3mdev_master_ifindex_rcu(dev); 78 79 rcu_read_unlock(); 80 } 81 82 return rc; 83 } 84 85 static inline 86 struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev) 87 { 88 /* netdev_master_upper_dev_get_rcu calls 89 * list_first_or_null_rcu to walk the upper dev list. 90 * list_first_or_null_rcu does not handle a const arg. We aren't 91 * making changes, just want the master device from that list so 92 * typecast to remove the const 93 */ 94 struct net_device *dev = (struct net_device *)_dev; 95 struct net_device *master; 96 97 if (!dev) 98 return NULL; 99 100 if (netif_is_l3_master(dev)) 101 master = dev; 102 else if (netif_is_l3_slave(dev)) 103 master = netdev_master_upper_dev_get_rcu(dev); 104 else 105 master = NULL; 106 107 return master; 108 } 109 110 u32 l3mdev_fib_table_rcu(const struct net_device *dev); 111 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); 112 static inline u32 l3mdev_fib_table(const struct net_device *dev) 113 { 114 u32 tb_id; 115 116 rcu_read_lock(); 117 tb_id = l3mdev_fib_table_rcu(dev); 118 rcu_read_unlock(); 119 120 return tb_id; 121 } 122 123 static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, 124 const struct flowi4 *fl4) 125 { 126 if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable) 127 return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4); 128 129 return NULL; 130 } 131 132 static inline bool netif_index_is_l3_master(struct net *net, int ifindex) 133 { 134 struct net_device *dev; 135 bool rc = false; 136 137 if (ifindex == 0) 138 return false; 139 140 rcu_read_lock(); 141 142 dev = dev_get_by_index_rcu(net, ifindex); 143 if (dev) 144 rc = netif_is_l3_master(dev); 145 146 rcu_read_unlock(); 147 148 return rc; 149 } 150 151 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6); 152 153 static inline 154 struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) 155 { 156 struct net_device *master = NULL; 157 158 if (netif_is_l3_slave(skb->dev)) 159 master = netdev_master_upper_dev_get_rcu(skb->dev); 160 else if (netif_is_l3_master(skb->dev)) 161 master = skb->dev; 162 163 if (master && master->l3mdev_ops->l3mdev_l3_rcv) 164 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); 165 166 return skb; 167 } 168 169 static inline 170 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) 171 { 172 return l3mdev_l3_rcv(skb, AF_INET); 173 } 174 175 static inline 176 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) 177 { 178 return l3mdev_l3_rcv(skb, AF_INET6); 179 } 180 181 static inline 182 struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto) 183 { 184 struct net_device *dev = skb_dst(skb)->dev; 185 186 if (netif_is_l3_slave(dev)) { 187 struct net_device *master; 188 189 master = netdev_master_upper_dev_get_rcu(dev); 190 if (master && master->l3mdev_ops->l3mdev_l3_out) 191 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk, 192 skb, proto); 193 } 194 195 return skb; 196 } 197 198 static inline 199 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) 200 { 201 return l3mdev_l3_out(sk, skb, AF_INET); 202 } 203 204 static inline 205 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) 206 { 207 return l3mdev_l3_out(sk, skb, AF_INET6); 208 } 209 #else 210 211 static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) 212 { 213 return 0; 214 } 215 static inline int l3mdev_master_ifindex(struct net_device *dev) 216 { 217 return 0; 218 } 219 220 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) 221 { 222 return 0; 223 } 224 225 static inline 226 struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) 227 { 228 return NULL; 229 } 230 231 static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) 232 { 233 return 0; 234 } 235 static inline u32 l3mdev_fib_table(const struct net_device *dev) 236 { 237 return 0; 238 } 239 static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) 240 { 241 return 0; 242 } 243 244 static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, 245 const struct flowi4 *fl4) 246 { 247 return NULL; 248 } 249 250 static inline bool netif_index_is_l3_master(struct net *net, int ifindex) 251 { 252 return false; 253 } 254 255 static inline 256 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6) 257 { 258 return NULL; 259 } 260 261 static inline 262 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) 263 { 264 return skb; 265 } 266 267 static inline 268 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) 269 { 270 return skb; 271 } 272 273 static inline 274 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) 275 { 276 return skb; 277 } 278 279 static inline 280 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) 281 { 282 return skb; 283 } 284 285 static inline 286 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, 287 struct fib_lookup_arg *arg) 288 { 289 return 1; 290 } 291 static inline 292 void l3mdev_update_flow(struct net *net, struct flowi *fl) 293 { 294 } 295 #endif 296 297 #endif /* _NET_L3MDEV_H_ */ 298