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