LXR linux/include/net/l3mdev.h

   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_ */
 335