| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _NET_IP6_ROUTE_H |
| #define _NET_IP6_ROUTE_H |
| |
| struct route_info { |
| __u8 type; |
| __u8 length; |
| __u8 prefix_len; |
| #if defined(__BIG_ENDIAN_BITFIELD) |
| __u8 reserved_h:3, |
| route_pref:2, |
| reserved_l:3; |
| #elif defined(__LITTLE_ENDIAN_BITFIELD) |
| __u8 reserved_l:3, |
| route_pref:2, |
| reserved_h:3; |
| #endif |
| __be32 lifetime; |
| __u8 prefix[0]; /* 0,8 or 16 */ |
| }; |
| |
| #include <net/addrconf.h> |
| #include <net/flow.h> |
| #include <net/ip6_fib.h> |
| #include <net/sock.h> |
| #include <net/lwtunnel.h> |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/route.h> |
| |
| #define RT6_LOOKUP_F_IFACE 0x00000001 |
| #define RT6_LOOKUP_F_REACHABLE 0x00000002 |
| #define RT6_LOOKUP_F_HAS_SADDR 0x00000004 |
| #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008 |
| #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 |
| #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 |
| #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040 |
| |
| /* We do not (yet ?) support IPv6 jumbograms (RFC 2675) |
| * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header |
| */ |
| #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) |
| |
| /* |
| * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate |
| * between IPV6_ADDR_PREFERENCES socket option values |
| * IPV6_PREFER_SRC_TMP = 0x1 |
| * IPV6_PREFER_SRC_PUBLIC = 0x2 |
| * IPV6_PREFER_SRC_COA = 0x4 |
| * and above RT6_LOOKUP_F_SRCPREF_xxx flags. |
| */ |
| static inline int rt6_srcprefs2flags(unsigned int srcprefs) |
| { |
| /* No need to bitmask because srcprefs have only 3 bits. */ |
| return srcprefs << 3; |
| } |
| |
| static inline unsigned int rt6_flags2srcprefs(int flags) |
| { |
| return (flags >> 3) & 7; |
| } |
| |
| static inline bool rt6_need_strict(const struct in6_addr *daddr) |
| { |
| return ipv6_addr_type(daddr) & |
| (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); |
| } |
| |
| static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i) |
| { |
| return (f6i->fib6_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) == |
| RTF_GATEWAY; |
| } |
| |
| void ip6_route_input(struct sk_buff *skb); |
| struct dst_entry *ip6_route_input_lookup(struct net *net, |
| struct net_device *dev, |
| struct flowi6 *fl6, |
| const struct sk_buff *skb, int flags); |
| |
| struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
| struct flowi6 *fl6, int flags); |
| |
| static inline struct dst_entry *ip6_route_output(struct net *net, |
| const struct sock *sk, |
| struct flowi6 *fl6) |
| { |
| return ip6_route_output_flags(net, sk, fl6, 0); |
| } |
| |
| struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
| const struct sk_buff *skb, int flags); |
| struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
| int ifindex, struct flowi6 *fl6, |
| const struct sk_buff *skb, int flags); |
| |
| void ip6_route_init_special_entries(void); |
| int ip6_route_init(void); |
| void ip6_route_cleanup(void); |
| |
| int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
| |
| int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
| struct netlink_ext_ack *extack); |
| int ip6_ins_rt(struct net *net, struct fib6_info *f6i); |
| int ip6_del_rt(struct net *net, struct fib6_info *f6i); |
| |
| void rt6_flush_exceptions(struct fib6_info *f6i); |
| void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args, |
| unsigned long now); |
| |
| static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i, |
| const struct in6_addr *daddr, |
| unsigned int prefs, |
| struct in6_addr *saddr) |
| { |
| int err = 0; |
| |
| if (f6i && f6i->fib6_prefsrc.plen) { |
| *saddr = f6i->fib6_prefsrc.addr; |
| } else { |
| struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL; |
| |
| err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr); |
| } |
| |
| return err; |
| } |
| |
| struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
| const struct in6_addr *saddr, int oif, |
| const struct sk_buff *skb, int flags); |
| u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
| const struct sk_buff *skb, struct flow_keys *hkeys); |
| |
| struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); |
| |
| void fib6_force_start_gc(struct net *net); |
| |
| struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev, |
| const struct in6_addr *addr, bool anycast, |
| gfp_t gfp_flags); |
| |
| struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
| int flags); |
| |
| /* |
| * support functions for ND |
| * |
| */ |
| struct fib6_info *rt6_get_dflt_router(struct net *net, |
| const struct in6_addr *addr, |
| struct net_device *dev); |
| struct fib6_info *rt6_add_dflt_router(struct net *net, |
| const struct in6_addr *gwaddr, |
| struct net_device *dev, unsigned int pref); |
| |
| void rt6_purge_dflt_routers(struct net *net); |
| |
| int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, |
| const struct in6_addr *gwaddr); |
| |
| void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, |
| u32 mark, kuid_t uid); |
| void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); |
| void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
| kuid_t uid); |
| void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
| u32 mark); |
| void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); |
| |
| struct netlink_callback; |
| |
| struct rt6_rtnl_dump_arg { |
| struct sk_buff *skb; |
| struct netlink_callback *cb; |
| struct net *net; |
| }; |
| |
| int rt6_dump_route(struct fib6_info *f6i, void *p_arg); |
| void rt6_mtu_change(struct net_device *dev, unsigned int mtu); |
| void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); |
| void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); |
| void rt6_sync_up(struct net_device *dev, unsigned int nh_flags); |
| void rt6_disable_ip(struct net_device *dev, unsigned long event); |
| void rt6_sync_down_dev(struct net_device *dev, unsigned long event); |
| void rt6_multipath_rebalance(struct fib6_info *f6i); |
| |
| void rt6_uncached_list_add(struct rt6_info *rt); |
| void rt6_uncached_list_del(struct rt6_info *rt); |
| |
| static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb) |
| { |
| const struct dst_entry *dst = skb_dst(skb); |
| const struct rt6_info *rt6 = NULL; |
| |
| if (dst) |
| rt6 = container_of(dst, struct rt6_info, dst); |
| |
| return rt6; |
| } |
| |
| /* |
| * Store a destination cache entry in a socket |
| */ |
| static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, |
| const struct in6_addr *daddr, |
| const struct in6_addr *saddr) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); |
| sk_setup_caps(sk, dst); |
| np->daddr_cache = daddr; |
| #ifdef CONFIG_IPV6_SUBTREES |
| np->saddr_cache = saddr; |
| #endif |
| } |
| |
| void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
| const struct flowi6 *fl6); |
| |
| static inline bool ipv6_unicast_destination(const struct sk_buff *skb) |
| { |
| struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); |
| |
| return rt->rt6i_flags & RTF_LOCAL; |
| } |
| |
| static inline bool ipv6_anycast_destination(const struct dst_entry *dst, |
| const struct in6_addr *daddr) |
| { |
| struct rt6_info *rt = (struct rt6_info *)dst; |
| |
| return rt->rt6i_flags & RTF_ANYCAST || |
| (rt->rt6i_dst.plen < 127 && |
| !(rt->rt6i_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) && |
| ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); |
| } |
| |
| int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
| int (*output)(struct net *, struct sock *, struct sk_buff *)); |
| |
| static inline int ip6_skb_dst_mtu(struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
| inet6_sk(skb->sk) : NULL; |
| |
| return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? |
| skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); |
| } |
| |
| static inline bool ip6_sk_accept_pmtu(const struct sock *sk) |
| { |
| return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && |
| inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; |
| } |
| |
| static inline bool ip6_sk_ignore_df(const struct sock *sk) |
| { |
| return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || |
| inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; |
| } |
| |
| static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, |
| struct in6_addr *daddr) |
| { |
| if (rt->rt6i_flags & RTF_GATEWAY) |
| return &rt->rt6i_gateway; |
| else if (unlikely(rt->rt6i_flags & RTF_CACHE)) |
| return &rt->rt6i_dst.addr; |
| else |
| return daddr; |
| } |
| |
| static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b) |
| { |
| return a->fib6_nh.nh_dev == b->fib6_nh.nh_dev && |
| ipv6_addr_equal(&a->fib6_nh.nh_gw, &b->fib6_nh.nh_gw) && |
| !lwtunnel_cmp_encap(a->fib6_nh.nh_lwtstate, b->fib6_nh.nh_lwtstate); |
| } |
| |
| static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) |
| { |
| struct inet6_dev *idev; |
| unsigned int mtu; |
| |
| if (dst_metric_locked(dst, RTAX_MTU)) { |
| mtu = dst_metric_raw(dst, RTAX_MTU); |
| if (mtu) |
| return mtu; |
| } |
| |
| mtu = IPV6_MIN_MTU; |
| rcu_read_lock(); |
| idev = __in6_dev_get(dst->dev); |
| if (idev) |
| mtu = idev->cnf.mtu6; |
| rcu_read_unlock(); |
| |
| return mtu; |
| } |
| |
| u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr, |
| struct in6_addr *saddr); |
| |
| struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
| struct net_device *dev, struct sk_buff *skb, |
| const void *daddr); |
| #endif |
