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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/addrconf.h>
 22 #include <net/flow.h>
 23 #include <net/ip6_fib.h>
 24 #include <net/sock.h>
 25 #include <net/lwtunnel.h>
 26 #include <linux/ip.h>
 27 #include <linux/ipv6.h>
 28 #include <linux/route.h>
 29 
 30 #define RT6_LOOKUP_F_IFACE              0x00000001
 31 #define RT6_LOOKUP_F_REACHABLE          0x00000002
 32 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
 33 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
 34 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
 35 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
 36 #define RT6_LOOKUP_F_IGNORE_LINKSTATE   0x00000040
 37 
 38 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
 39  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
 40  */
 41 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
 42 
 43 /*
 44  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
 45  * between IPV6_ADDR_PREFERENCES socket option values
 46  *      IPV6_PREFER_SRC_TMP    = 0x1
 47  *      IPV6_PREFER_SRC_PUBLIC = 0x2
 48  *      IPV6_PREFER_SRC_COA    = 0x4
 49  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
 50  */
 51 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
 52 {
 53         /* No need to bitmask because srcprefs have only 3 bits. */
 54         return srcprefs << 3;
 55 }
 56 
 57 static inline unsigned int rt6_flags2srcprefs(int flags)
 58 {
 59         return (flags >> 3) & 7;
 60 }
 61 
 62 static inline bool rt6_need_strict(const struct in6_addr *daddr)
 63 {
 64         return ipv6_addr_type(daddr) &
 65                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 66 }
 67 
 68 void ip6_route_input(struct sk_buff *skb);
 69 struct dst_entry *ip6_route_input_lookup(struct net *net,
 70                                          struct net_device *dev,
 71                                          struct flowi6 *fl6, int flags);
 72 
 73 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
 74                                          struct flowi6 *fl6, int flags);
 75 
 76 static inline struct dst_entry *ip6_route_output(struct net *net,
 77                                                  const struct sock *sk,
 78                                                  struct flowi6 *fl6)
 79 {
 80         return ip6_route_output_flags(net, sk, fl6, 0);
 81 }
 82 
 83 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
 84                                    int flags);
 85 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 86                                int ifindex, struct flowi6 *fl6, int flags);
 87 
 88 void ip6_route_init_special_entries(void);
 89 int ip6_route_init(void);
 90 void ip6_route_cleanup(void);
 91 
 92 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 93 
 94 int ip6_route_add(struct fib6_config *cfg);
 95 int ip6_ins_rt(struct rt6_info *);
 96 int ip6_del_rt(struct rt6_info *);
 97 
 98 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
 99                                       const struct in6_addr *daddr,
100                                       unsigned int prefs,
101                                       struct in6_addr *saddr)
102 {
103         struct inet6_dev *idev =
104                         rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
105         int err = 0;
106 
107         if (rt && rt->rt6i_prefsrc.plen)
108                 *saddr = rt->rt6i_prefsrc.addr;
109         else
110                 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
111                                          daddr, prefs, saddr);
112 
113         return err;
114 }
115 
116 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
117                             const struct in6_addr *saddr, int oif, int flags);
118 
119 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
120 int icmp6_dst_gc(void);
121 
122 void fib6_force_start_gc(struct net *net);
123 
124 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
125                                     const struct in6_addr *addr, bool anycast);
126 
127 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
128                                int flags);
129 
130 /*
131  *      support functions for ND
132  *
133  */
134 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
135                                      struct net_device *dev);
136 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
137                                      struct net_device *dev, unsigned int pref);
138 
139 void rt6_purge_dflt_routers(struct net *net);
140 
141 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
142                   const struct in6_addr *gwaddr);
143 
144 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
145                      u32 mark, kuid_t uid);
146 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
147 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
148                   kuid_t uid);
149 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
150                             u32 mark);
151 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
152 
153 struct netlink_callback;
154 
155 struct rt6_rtnl_dump_arg {
156         struct sk_buff *skb;
157         struct netlink_callback *cb;
158         struct net *net;
159 };
160 
161 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
162 void rt6_ifdown(struct net *net, struct net_device *dev);
163 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
164 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
165 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
166 
167 
168 /*
169  *      Store a destination cache entry in a socket
170  */
171 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
172                                  const struct in6_addr *daddr,
173                                  const struct in6_addr *saddr)
174 {
175         struct ipv6_pinfo *np = inet6_sk(sk);
176 
177         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
178         sk_setup_caps(sk, dst);
179         np->daddr_cache = daddr;
180 #ifdef CONFIG_IPV6_SUBTREES
181         np->saddr_cache = saddr;
182 #endif
183 }
184 
185 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
186 {
187         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
188 
189         return rt->rt6i_flags & RTF_LOCAL;
190 }
191 
192 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
193                                             const struct in6_addr *daddr)
194 {
195         struct rt6_info *rt = (struct rt6_info *)dst;
196 
197         return rt->rt6i_flags & RTF_ANYCAST ||
198                 (rt->rt6i_dst.plen != 128 &&
199                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
200 }
201 
202 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
203                  int (*output)(struct net *, struct sock *, struct sk_buff *));
204 
205 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
206 {
207         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
208                                 inet6_sk(skb->sk) : NULL;
209 
210         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
211                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
212 }
213 
214 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
215 {
216         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
217                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
218 }
219 
220 static inline bool ip6_sk_ignore_df(const struct sock *sk)
221 {
222         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
223                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
224 }
225 
226 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
227                                            struct in6_addr *daddr)
228 {
229         if (rt->rt6i_flags & RTF_GATEWAY)
230                 return &rt->rt6i_gateway;
231         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
232                 return &rt->rt6i_dst.addr;
233         else
234                 return daddr;
235 }
236 
237 static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
238 {
239         return a->dst.dev == b->dst.dev &&
240                a->rt6i_idev == b->rt6i_idev &&
241                ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
242                !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
243 }
244 #endif
245 

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