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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  */
rt6_srcprefs2flags(unsigned int srcprefs)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 
rt6_flags2srcprefs(int flags)54 static inline unsigned int rt6_flags2srcprefs(int flags)
55 {
56 	return (flags >> 3) & 7;
57 }
58 
rt6_need_strict(const struct in6_addr * daddr)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(struct net *net, const struct sock *sk,
68 				   struct flowi6 *fl6);
69 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
70 				   int flags);
71 
72 void ip6_route_init_special_entries(void);
73 int ip6_route_init(void);
74 void ip6_route_cleanup(void);
75 
76 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
77 
78 int ip6_route_add(struct fib6_config *cfg);
79 int ip6_ins_rt(struct rt6_info *);
80 int ip6_del_rt(struct rt6_info *);
81 
82 int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
83 			const struct in6_addr *daddr, unsigned int prefs,
84 			struct in6_addr *saddr);
85 
86 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
87 			    const struct in6_addr *saddr, int oif, int flags);
88 
89 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
90 int icmp6_dst_gc(void);
91 
92 void fib6_force_start_gc(struct net *net);
93 
94 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
95 				    const struct in6_addr *addr, bool anycast);
96 
97 /*
98  *	support functions for ND
99  *
100  */
101 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
102 				     struct net_device *dev);
103 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
104 				     struct net_device *dev, unsigned int pref);
105 
106 void rt6_purge_dflt_routers(struct net *net);
107 
108 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
109 		  const struct in6_addr *gwaddr);
110 
111 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
112 		     u32 mark, kuid_t uid);
113 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
114 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
115 		  kuid_t uid);
116 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
117 			    u32 mark);
118 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
119 
120 struct netlink_callback;
121 
122 struct rt6_rtnl_dump_arg {
123 	struct sk_buff *skb;
124 	struct netlink_callback *cb;
125 	struct net *net;
126 };
127 
128 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
129 void rt6_ifdown(struct net *net, struct net_device *dev);
130 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
131 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
132 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
133 
134 
135 /*
136  *	Store a destination cache entry in a socket
137  */
__ip6_dst_store(struct sock * sk,struct dst_entry * dst,const struct in6_addr * daddr,const struct in6_addr * saddr)138 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
139 				   const struct in6_addr *daddr,
140 				   const struct in6_addr *saddr)
141 {
142 	struct ipv6_pinfo *np = inet6_sk(sk);
143 	struct rt6_info *rt = (struct rt6_info *) dst;
144 
145 	sk_setup_caps(sk, dst);
146 	np->daddr_cache = daddr;
147 #ifdef CONFIG_IPV6_SUBTREES
148 	np->saddr_cache = saddr;
149 #endif
150 	np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
151 }
152 
ip6_dst_store(struct sock * sk,struct dst_entry * dst,struct in6_addr * daddr,struct in6_addr * saddr)153 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
154 				 struct in6_addr *daddr, struct in6_addr *saddr)
155 {
156 	spin_lock(&sk->sk_dst_lock);
157 	__ip6_dst_store(sk, dst, daddr, saddr);
158 	spin_unlock(&sk->sk_dst_lock);
159 }
160 
ipv6_unicast_destination(const struct sk_buff * skb)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 
ipv6_anycast_destination(const struct sk_buff * skb)168 static inline bool ipv6_anycast_destination(const struct sk_buff *skb)
169 {
170 	struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
171 
172 	return rt->rt6i_flags & RTF_ANYCAST;
173 }
174 
175 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
176 
ip6_skb_dst_mtu(struct sk_buff * skb)177 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
178 {
179 	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
180 				inet6_sk(skb->sk) : NULL;
181 
182 	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
183 	       skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
184 }
185 
ip6_sk_accept_pmtu(const struct sock * sk)186 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
187 {
188 	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
189 	       inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
190 }
191 
ip6_sk_ignore_df(const struct sock * sk)192 static inline bool ip6_sk_ignore_df(const struct sock *sk)
193 {
194 	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
195 	       inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
196 }
197 
rt6_nexthop(struct rt6_info * rt)198 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt)
199 {
200 	return &rt->rt6i_gateway;
201 }
202 
203 #endif
204