1#ifndef _NET_IP6_ROUTE_H 2#define _NET_IP6_ROUTE_H 3 4struct 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 */ 48static 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 54static inline unsigned int rt6_flags2srcprefs(int flags) 55{ 56 return (flags >> 3) & 7; 57} 58 59static 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 65void ip6_route_input(struct sk_buff *skb); 66 67struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, 68 struct flowi6 *fl6, int flags); 69 70static inline struct dst_entry *ip6_route_output(struct net *net, 71 const struct sock *sk, 72 struct flowi6 *fl6) 73{ 74 return ip6_route_output_flags(net, sk, fl6, 0); 75} 76 77struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 78 int flags); 79 80int ip6_route_init(void); 81void ip6_route_cleanup(void); 82 83int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); 84 85int ip6_route_add(struct fib6_config *cfg); 86int ip6_ins_rt(struct rt6_info *); 87int ip6_del_rt(struct rt6_info *); 88 89int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, 90 const struct in6_addr *daddr, unsigned int prefs, 91 struct in6_addr *saddr); 92 93struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 94 const struct in6_addr *saddr, int oif, int flags); 95 96struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); 97int icmp6_dst_gc(void); 98 99void fib6_force_start_gc(struct net *net); 100 101struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 102 const struct in6_addr *addr, bool anycast); 103 104/* 105 * support functions for ND 106 * 107 */ 108struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, 109 struct net_device *dev); 110struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 111 struct net_device *dev, unsigned int pref); 112 113void rt6_purge_dflt_routers(struct net *net); 114 115int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 116 const struct in6_addr *gwaddr); 117 118void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, 119 u32 mark); 120void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); 121void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 122void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 123 u32 mark); 124void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 125 126struct netlink_callback; 127 128struct rt6_rtnl_dump_arg { 129 struct sk_buff *skb; 130 struct netlink_callback *cb; 131 struct net *net; 132}; 133 134int rt6_dump_route(struct rt6_info *rt, void *p_arg); 135void rt6_ifdown(struct net *net, struct net_device *dev); 136void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 137void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 138void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); 139 140 141/* 142 * Store a destination cache entry in a socket 143 */ 144static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 145 const struct in6_addr *daddr, 146 const struct in6_addr *saddr) 147{ 148 struct ipv6_pinfo *np = inet6_sk(sk); 149 150 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); 151 sk_setup_caps(sk, dst); 152 np->daddr_cache = daddr; 153#ifdef CONFIG_IPV6_SUBTREES 154 np->saddr_cache = saddr; 155#endif 156} 157 158static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 159{ 160 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 161 162 return rt->rt6i_flags & RTF_LOCAL; 163} 164 165static inline bool ipv6_anycast_destination(const struct dst_entry *dst, 166 const struct in6_addr *daddr) 167{ 168 struct rt6_info *rt = (struct rt6_info *)dst; 169 170 return rt->rt6i_flags & RTF_ANYCAST || 171 (rt->rt6i_dst.plen != 128 && 172 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); 173} 174 175int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 176 int (*output)(struct net *, struct sock *, struct sk_buff *)); 177 178static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 179{ 180 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? 181 inet6_sk(skb->sk) : NULL; 182 183 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? 184 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 185} 186 187static inline bool ip6_sk_accept_pmtu(const struct sock *sk) 188{ 189 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && 190 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; 191} 192 193static inline bool ip6_sk_ignore_df(const struct sock *sk) 194{ 195 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || 196 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; 197} 198 199static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, 200 struct in6_addr *daddr) 201{ 202 if (rt->rt6i_flags & RTF_GATEWAY) 203 return &rt->rt6i_gateway; 204 else if (unlikely(rt->rt6i_flags & RTF_CACHE)) 205 return &rt->rt6i_dst.addr; 206 else 207 return daddr; 208} 209 210#endif 211