l3mdev.h (7162B)
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 13enum 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 21typedef 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 35struct 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 50int l3mdev_table_lookup_register(enum l3mdev_type l3type, 51 lookup_by_table_id_t fn); 52 53void l3mdev_table_lookup_unregister(enum l3mdev_type l3type, 54 lookup_by_table_id_t fn); 55 56int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net, 57 u32 table_id); 58 59int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, 60 struct fib_lookup_arg *arg); 61 62void l3mdev_update_flow(struct net *net, struct flowi *fl); 63 64int l3mdev_master_ifindex_rcu(const struct net_device *dev); 65static 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 76static 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 (likely(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 94static inline 95struct 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 119int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex); 120static inline 121int 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 130u32 l3mdev_fib_table_rcu(const struct net_device *dev); 131u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); 132static 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 143static 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 162struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6); 163 164static inline 165struct 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 181static inline 182struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) 183{ 184 return l3mdev_l3_rcv(skb, AF_INET); 185} 186 187static inline 188struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) 189{ 190 return l3mdev_l3_rcv(skb, AF_INET6); 191} 192 193static inline 194struct 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 master = netdev_master_upper_dev_get_rcu(dev); 202 if (master && master->l3mdev_ops->l3mdev_l3_out) 203 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk, 204 skb, proto); 205 } 206 207 return skb; 208} 209 210static inline 211struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) 212{ 213 return l3mdev_l3_out(sk, skb, AF_INET); 214} 215 216static inline 217struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) 218{ 219 return l3mdev_l3_out(sk, skb, AF_INET6); 220} 221#else 222 223static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) 224{ 225 return 0; 226} 227static inline int l3mdev_master_ifindex(struct net_device *dev) 228{ 229 return 0; 230} 231 232static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) 233{ 234 return 0; 235} 236 237static inline 238int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex) 239{ 240 return 0; 241} 242static inline 243int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) 244{ 245 return 0; 246} 247 248static inline 249struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) 250{ 251 return NULL; 252} 253 254static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) 255{ 256 return 0; 257} 258static inline u32 l3mdev_fib_table(const struct net_device *dev) 259{ 260 return 0; 261} 262static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) 263{ 264 return 0; 265} 266 267static inline bool netif_index_is_l3_master(struct net *net, int ifindex) 268{ 269 return false; 270} 271 272static inline 273struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6) 274{ 275 return NULL; 276} 277 278static inline 279struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) 280{ 281 return skb; 282} 283 284static inline 285struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) 286{ 287 return skb; 288} 289 290static inline 291struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) 292{ 293 return skb; 294} 295 296static inline 297struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) 298{ 299 return skb; 300} 301 302static inline 303int l3mdev_table_lookup_register(enum l3mdev_type l3type, 304 lookup_by_table_id_t fn) 305{ 306 return -EOPNOTSUPP; 307} 308 309static inline 310void l3mdev_table_lookup_unregister(enum l3mdev_type l3type, 311 lookup_by_table_id_t fn) 312{ 313} 314 315static inline 316int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net, 317 u32 table_id) 318{ 319 return -ENODEV; 320} 321 322static inline 323int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, 324 struct fib_lookup_arg *arg) 325{ 326 return 1; 327} 328static inline 329void l3mdev_update_flow(struct net *net, struct flowi *fl) 330{ 331} 332#endif 333 334#endif /* _NET_L3MDEV_H_ */