cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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seg6.h (2237B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 *  SR-IPv6 implementation
      4 *
      5 *  Author:
      6 *  David Lebrun <david.lebrun@uclouvain.be>
      7 */
      8
      9#ifndef _NET_SEG6_H
     10#define _NET_SEG6_H
     11
     12#include <linux/net.h>
     13#include <linux/ipv6.h>
     14#include <linux/seg6.h>
     15#include <linux/rhashtable-types.h>
     16
     17static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
     18				     __be32 to)
     19{
     20	__be32 diff[] = { ~from, to };
     21
     22	skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
     23}
     24
     25static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
     26				      __be32 *to)
     27{
     28	__be32 diff[] = {
     29		~from[0], ~from[1], ~from[2], ~from[3],
     30		to[0], to[1], to[2], to[3],
     31	};
     32
     33	skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
     34}
     35
     36struct seg6_pernet_data {
     37	struct mutex lock;
     38	struct in6_addr __rcu *tun_src;
     39#ifdef CONFIG_IPV6_SEG6_HMAC
     40	struct rhashtable hmac_infos;
     41#endif
     42};
     43
     44static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
     45{
     46#if IS_ENABLED(CONFIG_IPV6)
     47	return net->ipv6.seg6_data;
     48#else
     49	return NULL;
     50#endif
     51}
     52
     53extern int seg6_init(void);
     54extern void seg6_exit(void);
     55extern int seg6_iptunnel_init(void);
     56extern void seg6_iptunnel_exit(void);
     57extern int seg6_local_init(void);
     58extern void seg6_local_exit(void);
     59
     60extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced);
     61extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags);
     62extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt);
     63extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
     64			     int proto);
     65extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
     66extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
     67			       u32 tbl_id);
     68
     69/* If the packet which invoked an ICMP error contains an SRH return
     70 * the true destination address from within the SRH, otherwise use the
     71 * destination address in the IP header.
     72 */
     73static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb,
     74						    struct inet6_skb_parm *opt)
     75{
     76	struct ipv6_sr_hdr *srh;
     77
     78	if (opt->flags & IP6SKB_SEG6) {
     79		srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff);
     80		return  &srh->segments[0];
     81	}
     82
     83	return NULL;
     84}
     85
     86
     87#endif