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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NET_IP6_ROUTE_H
  3 #define _NET_IP6_ROUTE_H
  4 
  5 struct route_info {
  6         __u8                    type;
  7         __u8                    length;
  8         __u8                    prefix_len;
  9 #if defined(__BIG_ENDIAN_BITFIELD)
 10         __u8                    reserved_h:3,
 11                                 route_pref:2,
 12                                 reserved_l:3;
 13 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 14         __u8                    reserved_l:3,
 15                                 route_pref:2,
 16                                 reserved_h:3;
 17 #endif
 18         __be32                  lifetime;
 19         __u8                    prefix[0];      /* 0,8 or 16 */
 20 };
 21 
 22 #include <net/addrconf.h>
 23 #include <net/flow.h>
 24 #include <net/ip6_fib.h>
 25 #include <net/sock.h>
 26 #include <net/lwtunnel.h>
 27 #include <linux/ip.h>
 28 #include <linux/ipv6.h>
 29 #include <linux/route.h>
 30 
 31 #define RT6_LOOKUP_F_IFACE              0x00000001
 32 #define RT6_LOOKUP_F_REACHABLE          0x00000002
 33 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
 34 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
 35 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
 36 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
 37 #define RT6_LOOKUP_F_IGNORE_LINKSTATE   0x00000040
 38 
 39 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
 40  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
 41  */
 42 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
 43 
 44 /*
 45  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
 46  * between IPV6_ADDR_PREFERENCES socket option values
 47  *      IPV6_PREFER_SRC_TMP    = 0x1
 48  *      IPV6_PREFER_SRC_PUBLIC = 0x2
 49  *      IPV6_PREFER_SRC_COA    = 0x4
 50  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
 51  */
 52 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
 53 {
 54         /* No need to bitmask because srcprefs have only 3 bits. */
 55         return srcprefs << 3;
 56 }
 57 
 58 static inline unsigned int rt6_flags2srcprefs(int flags)
 59 {
 60         return (flags >> 3) & 7;
 61 }
 62 
 63 static inline bool rt6_need_strict(const struct in6_addr *daddr)
 64 {
 65         return ipv6_addr_type(daddr) &
 66                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 67 }
 68 
 69 static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
 70 {
 71         return (f6i->fib6_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) ==
 72                RTF_GATEWAY;
 73 }
 74 
 75 void ip6_route_input(struct sk_buff *skb);
 76 struct dst_entry *ip6_route_input_lookup(struct net *net,
 77                                          struct net_device *dev,
 78                                          struct flowi6 *fl6,
 79                                          const struct sk_buff *skb, int flags);
 80 
 81 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
 82                                          struct flowi6 *fl6, int flags);
 83 
 84 static inline struct dst_entry *ip6_route_output(struct net *net,
 85                                                  const struct sock *sk,
 86                                                  struct flowi6 *fl6)
 87 {
 88         return ip6_route_output_flags(net, sk, fl6, 0);
 89 }
 90 
 91 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
 92                                    const struct sk_buff *skb, int flags);
 93 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 94                                int ifindex, struct flowi6 *fl6,
 95                                const struct sk_buff *skb, int flags);
 96 
 97 void ip6_route_init_special_entries(void);
 98 int ip6_route_init(void);
 99 void ip6_route_cleanup(void);
100 
101 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
102 
103 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
104                   struct netlink_ext_ack *extack);
105 int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
106 int ip6_del_rt(struct net *net, struct fib6_info *f6i);
107 
108 void rt6_flush_exceptions(struct fib6_info *f6i);
109 void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
110                         unsigned long now);
111 
112 static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
113                                       const struct in6_addr *daddr,
114                                       unsigned int prefs,
115                                       struct in6_addr *saddr)
116 {
117         int err = 0;
118 
119         if (f6i && f6i->fib6_prefsrc.plen) {
120                 *saddr = f6i->fib6_prefsrc.addr;
121         } else {
122                 struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
123 
124                 err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
125         }
126 
127         return err;
128 }
129 
130 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
131                             const struct in6_addr *saddr, int oif,
132                             const struct sk_buff *skb, int flags);
133 u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
134                        const struct sk_buff *skb, struct flow_keys *hkeys);
135 
136 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
137 
138 void fib6_force_start_gc(struct net *net);
139 
140 struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,
141                                      const struct in6_addr *addr, bool anycast,
142                                      gfp_t gfp_flags);
143 
144 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
145                                int flags);
146 
147 /*
148  *      support functions for ND
149  *
150  */
151 struct fib6_info *rt6_get_dflt_router(struct net *net,
152                                      const struct in6_addr *addr,
153                                      struct net_device *dev);
154 struct fib6_info *rt6_add_dflt_router(struct net *net,
155                                      const struct in6_addr *gwaddr,
156                                      struct net_device *dev, unsigned int pref);
157 
158 void rt6_purge_dflt_routers(struct net *net);
159 
160 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
161                   const struct in6_addr *gwaddr);
162 
163 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
164                      u32 mark, kuid_t uid);
165 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
166 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
167                   kuid_t uid);
168 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif);
169 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
170 
171 struct netlink_callback;
172 
173 struct rt6_rtnl_dump_arg {
174         struct sk_buff *skb;
175         struct netlink_callback *cb;
176         struct net *net;
177         struct fib_dump_filter filter;
178 };
179 
180 int rt6_dump_route(struct fib6_info *f6i, void *p_arg);
181 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
182 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
183 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
184 void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
185 void rt6_disable_ip(struct net_device *dev, unsigned long event);
186 void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
187 void rt6_multipath_rebalance(struct fib6_info *f6i);
188 
189 void rt6_uncached_list_add(struct rt6_info *rt);
190 void rt6_uncached_list_del(struct rt6_info *rt);
191 
192 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
193 {
194         const struct dst_entry *dst = skb_dst(skb);
195         const struct rt6_info *rt6 = NULL;
196 
197         if (dst)
198                 rt6 = container_of(dst, struct rt6_info, dst);
199 
200         return rt6;
201 }
202 
203 /*
204  *      Store a destination cache entry in a socket
205  */
206 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
207                                  const struct in6_addr *daddr,
208                                  const struct in6_addr *saddr)
209 {
210         struct ipv6_pinfo *np = inet6_sk(sk);
211 
212         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
213         sk_setup_caps(sk, dst);
214         np->daddr_cache = daddr;
215 #ifdef CONFIG_IPV6_SUBTREES
216         np->saddr_cache = saddr;
217 #endif
218 }
219 
220 void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
221                            const struct flowi6 *fl6);
222 
223 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
224 {
225         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
226 
227         return rt->rt6i_flags & RTF_LOCAL;
228 }
229 
230 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
231                                             const struct in6_addr *daddr)
232 {
233         struct rt6_info *rt = (struct rt6_info *)dst;
234 
235         return rt->rt6i_flags & RTF_ANYCAST ||
236                 (rt->rt6i_dst.plen < 127 &&
237                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
238 }
239 
240 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
241                  int (*output)(struct net *, struct sock *, struct sk_buff *));
242 
243 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
244 {
245         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
246                                 inet6_sk(skb->sk) : NULL;
247 
248         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
249                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
250 }
251 
252 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
253 {
254         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
255                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
256 }
257 
258 static inline bool ip6_sk_ignore_df(const struct sock *sk)
259 {
260         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
261                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
262 }
263 
264 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
265                                            struct in6_addr *daddr)
266 {
267         if (rt->rt6i_flags & RTF_GATEWAY)
268                 return &rt->rt6i_gateway;
269         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
270                 return &rt->rt6i_dst.addr;
271         else
272                 return daddr;
273 }
274 
275 static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
276 {
277         return a->fib6_nh.nh_dev == b->fib6_nh.nh_dev &&
278                ipv6_addr_equal(&a->fib6_nh.nh_gw, &b->fib6_nh.nh_gw) &&
279                !lwtunnel_cmp_encap(a->fib6_nh.nh_lwtstate, b->fib6_nh.nh_lwtstate);
280 }
281 
282 static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
283 {
284         struct inet6_dev *idev;
285         unsigned int mtu;
286 
287         if (dst_metric_locked(dst, RTAX_MTU)) {
288                 mtu = dst_metric_raw(dst, RTAX_MTU);
289                 if (mtu)
290                         return mtu;
291         }
292 
293         mtu = IPV6_MIN_MTU;
294         rcu_read_lock();
295         idev = __in6_dev_get(dst->dev);
296         if (idev)
297                 mtu = idev->cnf.mtu6;
298         rcu_read_unlock();
299 
300         return mtu;
301 }
302 
303 u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
304                       struct in6_addr *saddr);
305 
306 struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
307                                    struct net_device *dev, struct sk_buff *skb,
308                                    const void *daddr);
309 #endif
310 

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