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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 #include <net/nexthop.h>
 31 
 32 #define RT6_LOOKUP_F_IFACE              0x00000001
 33 #define RT6_LOOKUP_F_REACHABLE          0x00000002
 34 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
 35 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
 36 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
 37 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
 38 #define RT6_LOOKUP_F_IGNORE_LINKSTATE   0x00000040
 39 #define RT6_LOOKUP_F_DST_NOREF          0x00000080
 40 
 41 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
 42  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
 43  */
 44 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
 45 
 46 /*
 47  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
 48  * between IPV6_ADDR_PREFERENCES socket option values
 49  *      IPV6_PREFER_SRC_TMP    = 0x1
 50  *      IPV6_PREFER_SRC_PUBLIC = 0x2
 51  *      IPV6_PREFER_SRC_COA    = 0x4
 52  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
 53  */
 54 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
 55 {
 56         /* No need to bitmask because srcprefs have only 3 bits. */
 57         return srcprefs << 3;
 58 }
 59 
 60 static inline unsigned int rt6_flags2srcprefs(int flags)
 61 {
 62         return (flags >> 3) & 7;
 63 }
 64 
 65 static inline bool rt6_need_strict(const struct in6_addr *daddr)
 66 {
 67         return ipv6_addr_type(daddr) &
 68                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 69 }
 70 
 71 /* fib entries using a nexthop object can not be coalesced into
 72  * a multipath route
 73  */
 74 static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
 75 {
 76         /* the RTF_ADDRCONF flag filters out RA's */
 77         return !(f6i->fib6_flags & RTF_ADDRCONF) && !f6i->nh &&
 78                 f6i->fib6_nh->fib_nh_gw_family;
 79 }
 80 
 81 void ip6_route_input(struct sk_buff *skb);
 82 struct dst_entry *ip6_route_input_lookup(struct net *net,
 83                                          struct net_device *dev,
 84                                          struct flowi6 *fl6,
 85                                          const struct sk_buff *skb, int flags);
 86 
 87 struct dst_entry *ip6_route_output_flags_noref(struct net *net,
 88                                                const struct sock *sk,
 89                                                struct flowi6 *fl6, int flags);
 90 
 91 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
 92                                          struct flowi6 *fl6, int flags);
 93 
 94 static inline struct dst_entry *ip6_route_output(struct net *net,
 95                                                  const struct sock *sk,
 96                                                  struct flowi6 *fl6)
 97 {
 98         return ip6_route_output_flags(net, sk, fl6, 0);
 99 }
100 
101 /* Only conditionally release dst if flags indicates
102  * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list.
103  */
104 static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags)
105 {
106         if (!(flags & RT6_LOOKUP_F_DST_NOREF) ||
107             !list_empty(&rt->rt6i_uncached))
108                 ip6_rt_put(rt);
109 }
110 
111 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
112                                    const struct sk_buff *skb, int flags);
113 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
114                                int ifindex, struct flowi6 *fl6,
115                                const struct sk_buff *skb, int flags);
116 
117 void ip6_route_init_special_entries(void);
118 int ip6_route_init(void);
119 void ip6_route_cleanup(void);
120 
121 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
122 
123 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
124                   struct netlink_ext_ack *extack);
125 int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
126 int ip6_del_rt(struct net *net, struct fib6_info *f6i);
127 
128 void rt6_flush_exceptions(struct fib6_info *f6i);
129 void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
130                         unsigned long now);
131 
132 static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
133                                       const struct in6_addr *daddr,
134                                       unsigned int prefs,
135                                       struct in6_addr *saddr)
136 {
137         int err = 0;
138 
139         if (f6i && f6i->fib6_prefsrc.plen) {
140                 *saddr = f6i->fib6_prefsrc.addr;
141         } else {
142                 struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
143 
144                 err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
145         }
146 
147         return err;
148 }
149 
150 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
151                             const struct in6_addr *saddr, int oif,
152                             const struct sk_buff *skb, int flags);
153 u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
154                        const struct sk_buff *skb, struct flow_keys *hkeys);
155 
156 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
157 
158 void fib6_force_start_gc(struct net *net);
159 
160 struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,
161                                      const struct in6_addr *addr, bool anycast,
162                                      gfp_t gfp_flags);
163 
164 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
165                                int flags);
166 
167 /*
168  *      support functions for ND
169  *
170  */
171 struct fib6_info *rt6_get_dflt_router(struct net *net,
172                                      const struct in6_addr *addr,
173                                      struct net_device *dev);
174 struct fib6_info *rt6_add_dflt_router(struct net *net,
175                                      const struct in6_addr *gwaddr,
176                                      struct net_device *dev, unsigned int pref);
177 
178 void rt6_purge_dflt_routers(struct net *net);
179 
180 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
181                   const struct in6_addr *gwaddr);
182 
183 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
184                      u32 mark, kuid_t uid);
185 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
186 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
187                   kuid_t uid);
188 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif);
189 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
190 
191 struct netlink_callback;
192 
193 struct rt6_rtnl_dump_arg {
194         struct sk_buff *skb;
195         struct netlink_callback *cb;
196         struct net *net;
197         struct fib_dump_filter filter;
198 };
199 
200 int rt6_dump_route(struct fib6_info *f6i, void *p_arg, unsigned int skip);
201 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
202 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
203 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
204 void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);
205 void rt6_disable_ip(struct net_device *dev, unsigned long event);
206 void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
207 void rt6_multipath_rebalance(struct fib6_info *f6i);
208 
209 void rt6_uncached_list_add(struct rt6_info *rt);
210 void rt6_uncached_list_del(struct rt6_info *rt);
211 
212 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
213 {
214         const struct dst_entry *dst = skb_dst(skb);
215         const struct rt6_info *rt6 = NULL;
216 
217         if (dst)
218                 rt6 = container_of(dst, struct rt6_info, dst);
219 
220         return rt6;
221 }
222 
223 /*
224  *      Store a destination cache entry in a socket
225  */
226 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
227                                  const struct in6_addr *daddr,
228                                  const struct in6_addr *saddr)
229 {
230         struct ipv6_pinfo *np = inet6_sk(sk);
231 
232         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
233         sk_setup_caps(sk, dst);
234         np->daddr_cache = daddr;
235 #ifdef CONFIG_IPV6_SUBTREES
236         np->saddr_cache = saddr;
237 #endif
238 }
239 
240 void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
241                            const struct flowi6 *fl6);
242 
243 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
244 {
245         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
246 
247         return rt->rt6i_flags & RTF_LOCAL;
248 }
249 
250 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
251                                             const struct in6_addr *daddr)
252 {
253         struct rt6_info *rt = (struct rt6_info *)dst;
254 
255         return rt->rt6i_flags & RTF_ANYCAST ||
256                 (rt->rt6i_dst.plen < 127 &&
257                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
258 }
259 
260 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
261                  int (*output)(struct net *, struct sock *, struct sk_buff *));
262 
263 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
264 {
265         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
266                                 inet6_sk(skb->sk) : NULL;
267 
268         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
269                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
270 }
271 
272 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
273 {
274         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
275                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
276 }
277 
278 static inline bool ip6_sk_ignore_df(const struct sock *sk)
279 {
280         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
281                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
282 }
283 
284 static inline const struct in6_addr *rt6_nexthop(const struct rt6_info *rt,
285                                                  const struct in6_addr *daddr)
286 {
287         if (rt->rt6i_flags & RTF_GATEWAY)
288                 return &rt->rt6i_gateway;
289         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
290                 return &rt->rt6i_dst.addr;
291         else
292                 return daddr;
293 }
294 
295 static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
296 {
297         struct fib6_nh *nha, *nhb;
298 
299         if (a->nh || b->nh)
300                 return nexthop_cmp(a->nh, b->nh);
301 
302         nha = a->fib6_nh;
303         nhb = b->fib6_nh;
304         return nha->fib_nh_dev == nhb->fib_nh_dev &&
305                ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) &&
306                !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws);
307 }
308 
309 static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
310 {
311         struct inet6_dev *idev;
312         unsigned int mtu;
313 
314         if (dst_metric_locked(dst, RTAX_MTU)) {
315                 mtu = dst_metric_raw(dst, RTAX_MTU);
316                 if (mtu)
317                         return mtu;
318         }
319 
320         mtu = IPV6_MIN_MTU;
321         rcu_read_lock();
322         idev = __in6_dev_get(dst->dev);
323         if (idev)
324                 mtu = idev->cnf.mtu6;
325         rcu_read_unlock();
326 
327         return mtu;
328 }
329 
330 u32 ip6_mtu_from_fib6(const struct fib6_result *res,
331                       const struct in6_addr *daddr,
332                       const struct in6_addr *saddr);
333 
334 struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
335                                    struct net_device *dev, struct sk_buff *skb,
336                                    const void *daddr);
337 #endif
338 

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