diff options
Diffstat (limited to 'include/net/ip6_route.h')
| -rw-r--r-- | include/net/ip6_route.h | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h new file mode 100644 index 0000000000..b32539bb0f --- /dev/null +++ b/include/net/ip6_route.h @@ -0,0 +1,345 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NET_IP6_ROUTE_H +#define _NET_IP6_ROUTE_H + +#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> +#include <net/nexthop.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[]; /* 0,8 or 16 */ +}; + +#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 +#define RT6_LOOKUP_F_DST_NOREF 0x00000080 + +/* 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); +} + +/* fib entries using a nexthop object can not be coalesced into + * a multipath route + */ +static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i) +{ + /* the RTF_ADDRCONF flag filters out RA's */ + return !(f6i->fib6_flags & RTF_ADDRCONF) && !f6i->nh && + f6i->fib6_nh->fib_nh_gw_family; +} + +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); +} + +/* Only conditionally release dst if flags indicates + * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list. + */ +static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags) +{ + if (!(flags & RT6_LOOKUP_F_DST_NOREF) || + !list_empty(&rt->dst.rt_uncached)) + ip6_rt_put(rt); +} + +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, + struct in6_rtmsg *rtmsg); + +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, bool skip_notify); + +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 netlink_ext_ack *extack); + +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, + u32 defrtr_usr_metric); + +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); +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; + struct fib_dump_filter filter; +}; + +int rt6_dump_route(struct fib6_info *f6i, void *p_arg, unsigned int skip); +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 char 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 unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb) +{ + const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? + inet6_sk(skb->sk) : NULL; + const struct dst_entry *dst = skb_dst(skb); + unsigned int mtu; + + if (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) { + mtu = READ_ONCE(dst->dev->mtu); + mtu -= lwtunnel_headroom(dst->lwtstate, mtu); + } else { + mtu = dst_mtu(dst); + } + return mtu; +} + +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 const struct in6_addr *rt6_nexthop(const struct rt6_info *rt, + const 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) +{ + struct fib6_nh *nha, *nhb; + + if (a->nh || b->nh) + return nexthop_cmp(a->nh, b->nh); + + nha = a->fib6_nh; + nhb = b->fib6_nh; + return nha->fib_nh_dev == nhb->fib_nh_dev && + ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) && + !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws); +} + +static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst, + bool forwarding) +{ + struct inet6_dev *idev; + unsigned int mtu; + + if (!forwarding || dst_metric_locked(dst, RTAX_MTU)) { + mtu = dst_metric_raw(dst, RTAX_MTU); + if (mtu) + goto out; + } + + mtu = IPV6_MIN_MTU; + rcu_read_lock(); + idev = __in6_dev_get(dst->dev); + if (idev) + mtu = idev->cnf.mtu6; + rcu_read_unlock(); + +out: + return mtu - lwtunnel_headroom(dst->lwtstate, mtu); +} + +u32 ip6_mtu_from_fib6(const struct fib6_result *res, + const struct in6_addr *daddr, + const 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 |