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 static inline void skb_clear_rxhash(struct sk_buff *skb)
  29 {
  30 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
  31         skb->rxhash = 0;
  32 #endif
  33 }
  34
  35 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,13,0)
  36 #define GROUP_ID(grp)   0
  37 #else
  38 #define GROUP_ID(grp)   ((grp)->id)
  39 #endif
  40
  41 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
  42 #define rt_dst(rt) (rt->dst)
  43 #else
  44 #define rt_dst(rt) (rt->u.dst)
  45 #endif
  46
  47 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
  48 #define inet_sport(sk)  (inet_sk(sk)->sport)
  49 #else
  50 #define inet_sport(sk)  (inet_sk(sk)->inet_sport)
  51 #endif
  52
  53 static inline struct rtable *find_route(struct net *net,
  54                                         __be32 *saddr, __be32 daddr,
  55                                         u8 ipproto, u8 tos, u32 skb_mark)
  56 {
  57         struct rtable *rt;
  58         /* Tunnel configuration keeps DSCP part of TOS bits, But Linux
  59          * router expect RT_TOS bits only. */
  60
  61 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
  62         struct flowi fl = { .nl_u = { .ip4_u = {
  63                                         .daddr = daddr,
  64                                         .saddr = *saddr,
  65                                         .tos   = RT_TOS(tos) } },
  66                                         .mark = skb_mark,
  67                                         .proto = ipproto };
  68
  69         if (unlikely(ip_route_output_key(net, &rt, &fl)))
  70                 return ERR_PTR(-EADDRNOTAVAIL);
  71         *saddr = fl.nl_u.ip4_u.saddr;
  72         return rt;
  73 #else
  74         struct flowi4 fl = { .daddr = daddr,
  75                              .saddr = *saddr,
  76                              .flowi4_tos = RT_TOS(tos),
  77                              .flowi4_mark = skb_mark,
  78                              .flowi4_proto = ipproto };
  79
  80         rt = ip_route_output_key(net, &fl);
  81         *saddr = fl.saddr;
  82         return rt;
  83 #endif
  84 }
  85 #endif /* compat.h */