mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
340 lines
9.8 KiB
340 lines
9.8 KiB
/* 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[]; /* 0,8 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> |
|
#include <net/nexthop.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 |
|
#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_noref(struct net *net, |
|
const struct sock *sk, |
|
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); |
|
} |
|
|
|
/* 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->rt6i_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 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 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 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_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(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
|
|
|