0b95227a7b
This option has the same semantic as IP_PMTUDISC_OMIT for IPv4 which
got recently introduced. It doesn't honor the path mtu discovered by the
host but in contrary to IPV6_PMTUDISC_INTERFACE allows the generation of
fragments if the packet size exceeds the MTU of the outgoing interface
MTU.
Fixes: 93b36cf342 ("ipv6: support IPV6_PMTU_INTERFACE on sockets")
Cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
189 lines
5.2 KiB
C
189 lines
5.2 KiB
C
#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/flow.h>
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#include <net/ip6_fib.h>
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#include <net/sock.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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/*
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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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void ip6_route_input(struct sk_buff *skb);
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struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
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struct flowi6 *fl6);
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struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
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int flags);
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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);
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int ip6_ins_rt(struct rt6_info *);
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int ip6_del_rt(struct rt6_info *);
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int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
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const struct in6_addr *daddr, unsigned int prefs,
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struct in6_addr *saddr);
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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, int flags);
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struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
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int icmp6_dst_gc(void);
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void fib6_force_start_gc(struct net *net);
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struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
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const struct in6_addr *addr, bool anycast);
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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 rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
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struct net_device *dev);
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struct rt6_info *rt6_add_dflt_router(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);
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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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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 rt6_info *rt, void *p_arg);
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void rt6_ifdown(struct net *net, struct net_device *dev);
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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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/*
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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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struct rt6_info *rt = (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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np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
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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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struct in6_addr *daddr, struct in6_addr *saddr)
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{
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spin_lock(&sk->sk_dst_lock);
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__ip6_dst_store(sk, dst, daddr, saddr);
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spin_unlock(&sk->sk_dst_lock);
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}
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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 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_ANYCAST;
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}
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int ip6_fragment(struct sk_buff *skb, int (*output)(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 ? 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_local_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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{
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return &rt->rt6i_gateway;
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}
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#endif
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