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TOMOYO Linux Cross Reference
Linux/include/net/ip6_route.h

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  1 #ifndef _NET_IP6_ROUTE_H
  2 #define _NET_IP6_ROUTE_H
  3 
  4 struct route_info {
  5         __u8                    type;
  6         __u8                    length;
  7         __u8                    prefix_len;
  8 #if defined(__BIG_ENDIAN_BITFIELD)
  9         __u8                    reserved_h:3,
 10                                 route_pref:2,
 11                                 reserved_l:3;
 12 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 13         __u8                    reserved_l:3,
 14                                 route_pref:2,
 15                                 reserved_h:3;
 16 #endif
 17         __be32                  lifetime;
 18         __u8                    prefix[0];      /* 0,8 or 16 */
 19 };
 20 
 21 #include <net/flow.h>
 22 #include <net/ip6_fib.h>
 23 #include <net/sock.h>
 24 #include <linux/ip.h>
 25 #include <linux/ipv6.h>
 26 #include <linux/route.h>
 27 
 28 #define RT6_LOOKUP_F_IFACE              0x00000001
 29 #define RT6_LOOKUP_F_REACHABLE          0x00000002
 30 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
 31 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
 32 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
 33 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
 34 
 35 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
 36  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
 37  */
 38 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
 39 
 40 /*
 41  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
 42  * between IPV6_ADDR_PREFERENCES socket option values
 43  *      IPV6_PREFER_SRC_TMP    = 0x1
 44  *      IPV6_PREFER_SRC_PUBLIC = 0x2
 45  *      IPV6_PREFER_SRC_COA    = 0x4
 46  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
 47  */
 48 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
 49 {
 50         /* No need to bitmask because srcprefs have only 3 bits. */
 51         return srcprefs << 3;
 52 }
 53 
 54 static inline unsigned int rt6_flags2srcprefs(int flags)
 55 {
 56         return (flags >> 3) & 7;
 57 }
 58 
 59 static inline bool rt6_need_strict(const struct in6_addr *daddr)
 60 {
 61         return ipv6_addr_type(daddr) &
 62                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 63 }
 64 
 65 void ip6_route_input(struct sk_buff *skb);
 66 
 67 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
 68                                          struct flowi6 *fl6, int flags);
 69 
 70 static inline struct dst_entry *ip6_route_output(struct net *net,
 71                                                  const struct sock *sk,
 72                                                  struct flowi6 *fl6)
 73 {
 74         return ip6_route_output_flags(net, sk, fl6, 0);
 75 }
 76 
 77 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
 78                                    int flags);
 79 
 80 int ip6_route_init(void);
 81 void ip6_route_cleanup(void);
 82 
 83 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 84 
 85 int ip6_route_add(struct fib6_config *cfg);
 86 int ip6_ins_rt(struct rt6_info *);
 87 int ip6_del_rt(struct rt6_info *);
 88 
 89 int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
 90                         const struct in6_addr *daddr, unsigned int prefs,
 91                         struct in6_addr *saddr);
 92 
 93 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 94                             const struct in6_addr *saddr, int oif, int flags);
 95 
 96 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 97 int icmp6_dst_gc(void);
 98 
 99 void fib6_force_start_gc(struct net *net);
100 
101 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
102                                     const struct in6_addr *addr, bool anycast);
103 
104 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
105                                int flags);
106 
107 /*
108  *      support functions for ND
109  *
110  */
111 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
112                                      struct net_device *dev);
113 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
114                                      struct net_device *dev, unsigned int pref);
115 
116 void rt6_purge_dflt_routers(struct net *net);
117 
118 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
119                   const struct in6_addr *gwaddr);
120 
121 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
122                      u32 mark);
123 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
124 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
125 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
126                             u32 mark);
127 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
128 
129 struct netlink_callback;
130 
131 struct rt6_rtnl_dump_arg {
132         struct sk_buff *skb;
133         struct netlink_callback *cb;
134         struct net *net;
135 };
136 
137 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
138 void rt6_ifdown(struct net *net, struct net_device *dev);
139 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
140 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
141 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
142 
143 
144 /*
145  *      Store a destination cache entry in a socket
146  */
147 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
148                                  const struct in6_addr *daddr,
149                                  const struct in6_addr *saddr)
150 {
151         struct ipv6_pinfo *np = inet6_sk(sk);
152 
153         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
154         sk_setup_caps(sk, dst);
155         np->daddr_cache = daddr;
156 #ifdef CONFIG_IPV6_SUBTREES
157         np->saddr_cache = saddr;
158 #endif
159 }
160 
161 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
162 {
163         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
164 
165         return rt->rt6i_flags & RTF_LOCAL;
166 }
167 
168 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
169                                             const struct in6_addr *daddr)
170 {
171         struct rt6_info *rt = (struct rt6_info *)dst;
172 
173         return rt->rt6i_flags & RTF_ANYCAST ||
174                 (rt->rt6i_dst.plen != 128 &&
175                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
176 }
177 
178 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
179                  int (*output)(struct net *, struct sock *, struct sk_buff *));
180 
181 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
182 {
183         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
184                                 inet6_sk(skb->sk) : NULL;
185 
186         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
187                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
188 }
189 
190 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
191 {
192         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
193                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
194 }
195 
196 static inline bool ip6_sk_ignore_df(const struct sock *sk)
197 {
198         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
199                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
200 }
201 
202 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
203                                            struct in6_addr *daddr)
204 {
205         if (rt->rt6i_flags & RTF_GATEWAY)
206                 return &rt->rt6i_gateway;
207         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
208                 return &rt->rt6i_dst.addr;
209         else
210                 return daddr;
211 }
212 
213 #endif
214 

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