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