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1c1e761ef1
The function lookup_nexthop is essential to implement most of the seg6local actions. As we want to provide a BPF helper allowing to apply some of these actions on the packet being processed, the helper should be able to call this function, hence the need to make it public. Moreover, if one argument is incorrect or if the next hop can not be found, an error should be returned by the BPF helper so the BPF program can adapt its processing of the packet (return an error, properly force the drop, ...). This patch hence makes this function return dst->error to indicate a possible error. Signed-off-by: Mathieu Xhonneux <m.xhonneux@gmail.com> Acked-by: David Lebrun <dlebrun@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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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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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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 <net/lwtunnel.h>
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#include <linux/seg6.h>
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#include <linux/rhashtable.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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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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extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
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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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#endif
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