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1da177e4 LT |
1 | #ifndef _NET_IP6_ROUTE_H |
2 | #define _NET_IP6_ROUTE_H | |
3 | ||
70ceb4f5 YH |
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 | |
e69a4adc | 17 | __be32 lifetime; |
70ceb4f5 YH |
18 | __u8 prefix[0]; /* 0,8 or 16 */ |
19 | }; | |
20 | ||
a2e2ff56 | 21 | #include <net/addrconf.h> |
1da177e4 LT |
22 | #include <net/flow.h> |
23 | #include <net/ip6_fib.h> | |
24 | #include <net/sock.h> | |
f06b7549 | 25 | #include <net/lwtunnel.h> |
1da177e4 LT |
26 | #include <linux/ip.h> |
27 | #include <linux/ipv6.h> | |
9bb5a148 | 28 | #include <linux/route.h> |
1da177e4 | 29 | |
7cbca67c YH |
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 | |
d5d32e4b | 36 | #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040 |
77d16f45 | 37 | |
30f78d8e ED |
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 | ||
0c9a2ac1 YH |
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 | } | |
1da177e4 | 61 | |
60ea37f7 WY |
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 | } | |
fbfe95a4 | 67 | |
5c3a0fd7 | 68 | void ip6_route_input(struct sk_buff *skb); |
d409b847 MB |
69 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
70 | struct net_device *dev, | |
71 | struct flowi6 *fl6, int flags); | |
1da177e4 | 72 | |
6f21c96a PA |
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 | ||
5c3a0fd7 JP |
83 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
84 | int flags); | |
9ff74384 DA |
85 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
86 | int ifindex, struct flowi6 *fl6, int flags); | |
1da177e4 | 87 | |
2f460933 | 88 | void ip6_route_init_special_entries(void); |
5c3a0fd7 JP |
89 | int ip6_route_init(void); |
90 | void ip6_route_cleanup(void); | |
1da177e4 | 91 | |
5c3a0fd7 | 92 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
1da177e4 | 93 | |
333c4301 | 94 | int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack); |
5c3a0fd7 JP |
95 | int ip6_ins_rt(struct rt6_info *); |
96 | int ip6_del_rt(struct rt6_info *); | |
1da177e4 | 97 | |
a2e2ff56 DA |
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 | } | |
c3968a85 | 115 | |
5c3a0fd7 JP |
116 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
117 | const struct in6_addr *saddr, int oif, int flags); | |
23aebdac | 118 | u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb); |
1da177e4 | 119 | |
5c3a0fd7 | 120 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); |
3b00944c | 121 | |
5c3a0fd7 | 122 | void fib6_force_start_gc(struct net *net); |
1da177e4 | 123 | |
5c3a0fd7 JP |
124 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, |
125 | const struct in6_addr *addr, bool anycast); | |
1da177e4 | 126 | |
9ab179d8 DA |
127 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
128 | int flags); | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * support functions for ND | |
132 | * | |
133 | */ | |
5c3a0fd7 JP |
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, | |
e2d118a1 | 145 | u32 mark, kuid_t uid); |
5c3a0fd7 | 146 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); |
e2d118a1 LC |
147 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
148 | kuid_t uid); | |
5c3a0fd7 JP |
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); | |
1da177e4 | 152 | |
1da177e4 | 153 | struct netlink_callback; |
1da177e4 | 154 | |
fd2c3ef7 | 155 | struct rt6_rtnl_dump_arg { |
1b43af54 PM |
156 | struct sk_buff *skb; |
157 | struct netlink_callback *cb; | |
191cd582 | 158 | struct net *net; |
1b43af54 PM |
159 | }; |
160 | ||
5c3a0fd7 JP |
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); | |
be7a010d | 165 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); |
1da177e4 | 166 | |
1b70d792 DA |
167 | static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb) |
168 | { | |
169 | const struct dst_entry *dst = skb_dst(skb); | |
170 | const struct rt6_info *rt6 = NULL; | |
171 | ||
172 | if (dst) | |
173 | rt6 = container_of(dst, struct rt6_info, dst); | |
174 | ||
175 | return rt6; | |
176 | } | |
1da177e4 LT |
177 | |
178 | /* | |
179 | * Store a destination cache entry in a socket | |
180 | */ | |
6bd4f355 ED |
181 | static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, |
182 | const struct in6_addr *daddr, | |
183 | const struct in6_addr *saddr) | |
1da177e4 LT |
184 | { |
185 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1da177e4 | 186 | |
6bd4f355 | 187 | np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); |
f83ef8c0 | 188 | sk_setup_caps(sk, dst); |
1da177e4 | 189 | np->daddr_cache = daddr; |
8e1ef0a9 YH |
190 | #ifdef CONFIG_IPV6_SUBTREES |
191 | np->saddr_cache = saddr; | |
192 | #endif | |
1da177e4 LT |
193 | } |
194 | ||
a50feda5 | 195 | static inline bool ipv6_unicast_destination(const struct sk_buff *skb) |
1da177e4 | 196 | { |
adf30907 | 197 | struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
198 | |
199 | return rt->rt6i_flags & RTF_LOCAL; | |
200 | } | |
201 | ||
2647a9b0 MKL |
202 | static inline bool ipv6_anycast_destination(const struct dst_entry *dst, |
203 | const struct in6_addr *daddr) | |
509aba3b | 204 | { |
2647a9b0 | 205 | struct rt6_info *rt = (struct rt6_info *)dst; |
509aba3b | 206 | |
2647a9b0 | 207 | return rt->rt6i_flags & RTF_ANYCAST || |
ccdb2d17 | 208 | (rt->rt6i_dst.plen < 127 && |
2647a9b0 | 209 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); |
509aba3b FLB |
210 | } |
211 | ||
7d8c6e39 EB |
212 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
213 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
ad0081e4 DS |
214 | |
215 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) | |
216 | { | |
f60e5990 | 217 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
218 | inet6_sk(skb->sk) : NULL; | |
ad0081e4 | 219 | |
93b36cf3 | 220 | return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? |
ad0081e4 DS |
221 | skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); |
222 | } | |
223 | ||
93b36cf3 HFS |
224 | static inline bool ip6_sk_accept_pmtu(const struct sock *sk) |
225 | { | |
0b95227a HFS |
226 | return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && |
227 | inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; | |
228 | } | |
229 | ||
60ff7467 | 230 | static inline bool ip6_sk_ignore_df(const struct sock *sk) |
0b95227a HFS |
231 | { |
232 | return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || | |
233 | inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; | |
93b36cf3 HFS |
234 | } |
235 | ||
2647a9b0 MKL |
236 | static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, |
237 | struct in6_addr *daddr) | |
9bb5a148 | 238 | { |
2647a9b0 MKL |
239 | if (rt->rt6i_flags & RTF_GATEWAY) |
240 | return &rt->rt6i_gateway; | |
45e4fd26 | 241 | else if (unlikely(rt->rt6i_flags & RTF_CACHE)) |
2647a9b0 MKL |
242 | return &rt->rt6i_dst.addr; |
243 | else | |
244 | return daddr; | |
9bb5a148 YH |
245 | } |
246 | ||
f06b7549 DA |
247 | static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b) |
248 | { | |
249 | return a->dst.dev == b->dst.dev && | |
250 | a->rt6i_idev == b->rt6i_idev && | |
251 | ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) && | |
252 | !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate); | |
253 | } | |
1da177e4 | 254 | #endif |