244 lines
6.9 KiB
C
244 lines
6.9 KiB
C
#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);
|
|
}
|
|
|
|
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, 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,
|
|
int flags);
|
|
struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
|
|
int ifindex, struct flowi6 *fl6, 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, struct netlink_ext_ack *extack);
|
|
int ip6_ins_rt(struct rt6_info *);
|
|
int ip6_del_rt(struct rt6_info *);
|
|
|
|
static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
|
|
const struct in6_addr *daddr,
|
|
unsigned int prefs,
|
|
struct in6_addr *saddr)
|
|
{
|
|
struct inet6_dev *idev =
|
|
rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
|
|
int err = 0;
|
|
|
|
if (rt && rt->rt6i_prefsrc.plen)
|
|
*saddr = rt->rt6i_prefsrc.addr;
|
|
else
|
|
err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
|
|
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, int flags);
|
|
|
|
struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
|
|
|
|
void fib6_force_start_gc(struct net *net);
|
|
|
|
struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
|
|
const struct in6_addr *addr, bool anycast);
|
|
|
|
struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
|
|
int flags);
|
|
|
|
/*
|
|
* support functions for ND
|
|
*
|
|
*/
|
|
struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
|
|
struct net_device *dev);
|
|
struct rt6_info *rt6_add_dflt_router(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 rt6_info *rt, void *p_arg);
|
|
void rt6_ifdown(struct net *net, struct net_device *dev);
|
|
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);
|
|
|
|
|
|
/*
|
|
* 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
|
|
}
|
|
|
|
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 != 128 &&
|
|
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 rt6_info *a, struct rt6_info *b)
|
|
{
|
|
return a->dst.dev == b->dst.dev &&
|
|
a->rt6i_idev == b->rt6i_idev &&
|
|
ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
|
|
!lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
|
|
}
|
|
#endif
|