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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>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*/
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#ifndef _NET_SEG6_H
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#define _NET_SEG6_H
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/seg6.h>
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#include <linux/rhashtable-types.h>
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static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
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__be32 to)
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{
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__be32 diff[] = { ~from, to };
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skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
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}
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static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
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__be32 *to)
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{
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__be32 diff[] = {
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~from[0], ~from[1], ~from[2], ~from[3],
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to[0], to[1], to[2], to[3],
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};
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skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
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}
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struct seg6_pernet_data {
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struct mutex lock;
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struct in6_addr __rcu *tun_src;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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struct rhashtable hmac_infos;
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#endif
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};
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static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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return net->ipv6.seg6_data;
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#else
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return NULL;
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#endif
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}
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extern int seg6_init(void);
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extern void seg6_exit(void);
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#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
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extern int seg6_iptunnel_init(void);
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extern void seg6_iptunnel_exit(void);
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extern int seg6_local_init(void);
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extern void seg6_local_exit(void);
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#else
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static inline int seg6_iptunnel_init(void) { return 0; }
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static inline void seg6_iptunnel_exit(void) {}
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static inline int seg6_local_init(void) { return 0; }
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static inline void seg6_local_exit(void) {}
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#endif
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extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced);
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extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags);
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extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt);
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extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
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int proto);
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extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
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extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
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u32 tbl_id);
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/* If the packet which invoked an ICMP error contains an SRH return
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* the true destination address from within the SRH, otherwise use the
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* destination address in the IP header.
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*/
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static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb,
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struct inet6_skb_parm *opt)
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{
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struct ipv6_sr_hdr *srh;
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if (opt->flags & IP6SKB_SEG6) {
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srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff);
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return &srh->segments[0];
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}
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return NULL;
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}
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#endif
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