datapath/compat.h

   1 /*
   2  * Copyright (c) 2007-2012 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #ifndef COMPAT_H
  20 #define COMPAT_H 1
  21
  22 #include <linux/in.h>
  23 #include <linux/in_route.h>
  24 #include <linux/netlink.h>
  25 #include <net/route.h>
  26 #include <net/xfrm.h>
  27
  28 #ifdef HAVE_GENL_MULTICAST_GROUP_WITH_ID
  29 #define GROUP_ID(grp)   ((grp)->id)
  30 #else
  31 #define GROUP_ID(grp)   0
  32 #endif
  33
  34 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
  35 #define rt_dst(rt) (rt->dst)
  36 #else
  37 #define rt_dst(rt) (rt->u.dst)
  38 #endif
  39
  40 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
  41 #define inet_sport(sk)  (inet_sk(sk)->sport)
  42 #else
  43 #define inet_sport(sk)  (inet_sk(sk)->inet_sport)
  44 #endif
  45
  46 static inline struct rtable *find_route(struct net *net,
  47                                         __be32 *saddr, __be32 daddr,
  48                                         u8 ipproto, u8 tos, u32 skb_mark)
  49 {
  50         struct rtable *rt;
  51         /* Tunnel configuration keeps DSCP part of TOS bits, But Linux
  52          * router expect RT_TOS bits only.
  53          */
  54
  55 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
  56         struct flowi fl = { .nl_u = { .ip4_u = {
  57                                         .daddr = daddr,
  58                                         .saddr = *saddr,
  59                                         .tos   = RT_TOS(tos) } },
  60                                         .mark = skb_mark,
  61                                         .proto = ipproto };
  62
  63         if (unlikely(ip_route_output_key(net, &rt, &fl)))
  64                 return ERR_PTR(-EADDRNOTAVAIL);
  65         *saddr = fl.nl_u.ip4_u.saddr;
  66         return rt;
  67 #else
  68         struct flowi4 fl = { .daddr = daddr,
  69                              .saddr = *saddr,
  70                              .flowi4_tos = RT_TOS(tos),
  71                              .flowi4_mark = skb_mark,
  72                              .flowi4_proto = ipproto };
  73
  74         rt = ip_route_output_key(net, &fl);
  75         *saddr = fl.saddr;
  76         return rt;
  77 #endif
  78 }
  79
  80 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
  81 static inline bool skb_encapsulation(struct sk_buff *skb)
  82 {
  83         return skb->encapsulation;
  84 }
  85 #else
  86 #define skb_encapsulation(skb) false
  87 #endif
  88
  89 #endif /* compat.h */