LXR linux/include/net/l3mdev.h

   1/*
   2 * include/net/l3mdev.h - L3 master device API
   3 * Copyright (c) 2015 Cumulus Networks
   4 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
   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_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations
  27 */
  28
  29struct l3mdev_ops {
  30        u32             (*l3mdev_fib_table)(const struct net_device *dev);
  31        struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
  32                                          struct sk_buff *skb, u16 proto);
  33        struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,
  34                                          struct sock *sk, struct sk_buff *skb,
  35                                          u16 proto);
  36
  37        /* IPv6 ops */
  38        struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,
  39                                                 struct flowi6 *fl6);
  40};
  41
  42#ifdef CONFIG_NET_L3_MASTER_DEV
  43
  44int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
  45                          struct fib_lookup_arg *arg);
  46
  47void l3mdev_update_flow(struct net *net, struct flowi *fl);
  48
  49int l3mdev_master_ifindex_rcu(const struct net_device *dev);
  50static inline int l3mdev_master_ifindex(struct net_device *dev)
  51{
  52        int ifindex;
  53
  54        rcu_read_lock();
  55        ifindex = l3mdev_master_ifindex_rcu(dev);
  56        rcu_read_unlock();
  57
  58        return ifindex;
  59}
  60
  61static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
  62{
  63        struct net_device *dev;
  64        int rc = 0;
  65
  66        if (likely(ifindex)) {
  67                rcu_read_lock();
  68
  69                dev = dev_get_by_index_rcu(net, ifindex);
  70                if (dev)
  71                        rc = l3mdev_master_ifindex_rcu(dev);
  72
  73                rcu_read_unlock();
  74        }
  75
  76        return rc;
  77}
  78
  79static inline
  80struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
  81{
  82        /* netdev_master_upper_dev_get_rcu calls
  83         * list_first_or_null_rcu to walk the upper dev list.
  84         * list_first_or_null_rcu does not handle a const arg. We aren't
  85         * making changes, just want the master device from that list so
  86         * typecast to remove the const
  87         */
  88        struct net_device *dev = (struct net_device *)_dev;
  89        struct net_device *master;
  90
  91        if (!dev)
  92                return NULL;
  93
  94        if (netif_is_l3_master(dev))
  95                master = dev;
  96        else if (netif_is_l3_slave(dev))
  97                master = netdev_master_upper_dev_get_rcu(dev);
  98        else
  99                master = NULL;
 100
 101        return master;
 102}
 103
 104u32 l3mdev_fib_table_rcu(const struct net_device *dev);
 105u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
 106static inline u32 l3mdev_fib_table(const struct net_device *dev)
 107{
 108        u32 tb_id;
 109
 110        rcu_read_lock();
 111        tb_id = l3mdev_fib_table_rcu(dev);
 112        rcu_read_unlock();
 113
 114        return tb_id;
 115}
 116
 117static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
 118{
 119        struct net_device *dev;
 120        bool rc = false;
 121
 122        if (ifindex == 0)
 123                return false;
 124
 125        rcu_read_lock();
 126
 127        dev = dev_get_by_index_rcu(net, ifindex);
 128        if (dev)
 129                rc = netif_is_l3_master(dev);
 130
 131        rcu_read_unlock();
 132
 133        return rc;
 134}
 135
 136struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
 137
 138static inline
 139struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
 140{
 141        struct net_device *master = NULL;
 142
 143        if (netif_is_l3_slave(skb->dev))
 144                master = netdev_master_upper_dev_get_rcu(skb->dev);
 145        else if (netif_is_l3_master(skb->dev))
 146                master = skb->dev;
 147
 148        if (master && master->l3mdev_ops->l3mdev_l3_rcv)
 149                skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
 150
 151        return skb;
 152}
 153
 154static inline
 155struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
 156{
 157        return l3mdev_l3_rcv(skb, AF_INET);
 158}
 159
 160static inline
 161struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
 162{
 163        return l3mdev_l3_rcv(skb, AF_INET6);
 164}
 165
 166static inline
 167struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
 168{
 169        struct net_device *dev = skb_dst(skb)->dev;
 170
 171        if (netif_is_l3_slave(dev)) {
 172                struct net_device *master;
 173
 174                master = netdev_master_upper_dev_get_rcu(dev);
 175                if (master && master->l3mdev_ops->l3mdev_l3_out)
 176                        skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
 177                                                                skb, proto);
 178        }
 179
 180        return skb;
 181}
 182
 183static inline
 184struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
 185{
 186        return l3mdev_l3_out(sk, skb, AF_INET);
 187}
 188
 189static inline
 190struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
 191{
 192        return l3mdev_l3_out(sk, skb, AF_INET6);
 193}
 194#else
 195
 196static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
 197{
 198        return 0;
 199}
 200static inline int l3mdev_master_ifindex(struct net_device *dev)
 201{
 202        return 0;
 203}
 204
 205static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
 206{
 207        return 0;
 208}
 209
 210static inline
 211struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
 212{
 213        return NULL;
 214}
 215
 216static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
 217{
 218        return 0;
 219}
 220static inline u32 l3mdev_fib_table(const struct net_device *dev)
 221{
 222        return 0;
 223}
 224static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
 225{
 226        return 0;
 227}
 228
 229static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
 230{
 231        return false;
 232}
 233
 234static inline
 235struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
 236{
 237        return NULL;
 238}
 239
 240static inline
 241struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
 242{
 243        return skb;
 244}
 245
 246static inline
 247struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
 248{
 249        return skb;
 250}
 251
 252static inline
 253struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
 254{
 255        return skb;
 256}
 257
 258static inline
 259struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
 260{
 261        return skb;
 262}
 263
 264static inline
 265int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
 266                          struct fib_lookup_arg *arg)
 267{
 268        return 1;
 269}
 270static inline
 271void l3mdev_update_flow(struct net *net, struct flowi *fl)
 272{
 273}
 274#endif
 275
 276#endif /* _NET_L3MDEV_H_ */
 277