forked from mirrors/linux
a79d8fe2ff
There are too many ifdef in IPv6 segment routing code that may cause logic
problems. like commit 160e9d2752 ("ipv6: sr: fix invalid unregister error
path"). To avoid this, the init functions are redefined for both cases. The
code could be more clear after all fidefs are removed.
Suggested-by: Simon Horman <horms@kernel.org>
Suggested-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240529040908.3472952-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* SR-IPv6 implementation
|
|
*
|
|
* Author:
|
|
* David Lebrun <david.lebrun@uclouvain.be>
|
|
*/
|
|
|
|
#ifndef _NET_SEG6_H
|
|
#define _NET_SEG6_H
|
|
|
|
#include <linux/net.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/seg6.h>
|
|
#include <linux/rhashtable-types.h>
|
|
|
|
static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
|
|
__be32 to)
|
|
{
|
|
__be32 diff[] = { ~from, to };
|
|
|
|
skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
|
|
}
|
|
|
|
static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
|
|
__be32 *to)
|
|
{
|
|
__be32 diff[] = {
|
|
~from[0], ~from[1], ~from[2], ~from[3],
|
|
to[0], to[1], to[2], to[3],
|
|
};
|
|
|
|
skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
|
|
}
|
|
|
|
struct seg6_pernet_data {
|
|
struct mutex lock;
|
|
struct in6_addr __rcu *tun_src;
|
|
#ifdef CONFIG_IPV6_SEG6_HMAC
|
|
struct rhashtable hmac_infos;
|
|
#endif
|
|
};
|
|
|
|
static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
|
|
{
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
return net->ipv6.seg6_data;
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
extern int seg6_init(void);
|
|
extern void seg6_exit(void);
|
|
#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
|
|
extern int seg6_iptunnel_init(void);
|
|
extern void seg6_iptunnel_exit(void);
|
|
extern int seg6_local_init(void);
|
|
extern void seg6_local_exit(void);
|
|
#else
|
|
static inline int seg6_iptunnel_init(void) { return 0; }
|
|
static inline void seg6_iptunnel_exit(void) {}
|
|
static inline int seg6_local_init(void) { return 0; }
|
|
static inline void seg6_local_exit(void) {}
|
|
#endif
|
|
|
|
extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced);
|
|
extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags);
|
|
extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt);
|
|
extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
|
|
int proto);
|
|
extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
|
|
extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
|
|
u32 tbl_id);
|
|
|
|
/* If the packet which invoked an ICMP error contains an SRH return
|
|
* the true destination address from within the SRH, otherwise use the
|
|
* destination address in the IP header.
|
|
*/
|
|
static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb,
|
|
struct inet6_skb_parm *opt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
|
|
if (opt->flags & IP6SKB_SEG6) {
|
|
srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff);
|
|
return &srh->segments[0];
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
#endif
|