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ipv6: sr: add core files for SR HMAC support

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This patch adds the necessary functions to compute and check the HMAC signature
of an SR-enabled packet. Two HMAC algorithms are supported: hmac(sha1) and
hmac(sha256).

In order to avoid dynamic memory allocation for each HMAC computation,
a per-cpu ring buffer is allocated for this purpose.

A new per-interface sysctl called seg6_require_hmac is added, allowing a
user-defined policy for processing HMAC-signed SR-enabled packets.
A value of -1 means that the HMAC field will always be ignored.
A value of 0 means that if an HMAC field is present, its validity will
be enforced (the packet is dropped is the signature is incorrect).
Finally, a value of 1 means that any SR-enabled packet that does not
contain an HMAC signature or whose signature is incorrect will be dropped.

Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Lebrun
2016-11-08 14:57:42 +01:00
committed by David S. Miller
parent 6c8702c60b
commit bf355b8d2c
10 changed files with 612 additions and 0 deletions
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62
include/net/seg6_hmac.h Normal file
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/*
* SR-IPv6 implementation
*
* Author:
* David Lebrun <david.lebrun@uclouvain.be>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _NET_SEG6_HMAC_H
#define _NET_SEG6_HMAC_H
#include <net/flow.h>
#include <net/ip6_fib.h>
#include <net/sock.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/route.h>
#include <net/seg6.h>
#include <linux/seg6_hmac.h>
#include <linux/rhashtable.h>
#define SEG6_HMAC_MAX_DIGESTSIZE 160
#define SEG6_HMAC_RING_SIZE 256
struct seg6_hmac_info {
struct rhash_head node;
struct rcu_head rcu;
u32 hmackeyid;
char secret[SEG6_HMAC_SECRET_LEN];
u8 slen;
u8 alg_id;
};
struct seg6_hmac_algo {
u8 alg_id;
char name[64];
struct crypto_shash * __percpu *tfms;
struct shash_desc * __percpu *shashs;
};
extern int seg6_hmac_compute(struct seg6_hmac_info *hinfo,
struct ipv6_sr_hdr *hdr, struct in6_addr *saddr,
u8 *output);
extern struct seg6_hmac_info *seg6_hmac_info_lookup(struct net *net, u32 key);
extern int seg6_hmac_info_add(struct net *net, u32 key,
struct seg6_hmac_info *hinfo);
extern int seg6_hmac_info_del(struct net *net, u32 key);
extern int seg6_push_hmac(struct net *net, struct in6_addr *saddr,
struct ipv6_sr_hdr *srh);
extern bool seg6_hmac_validate_skb(struct sk_buff *skb);
extern int seg6_hmac_init(void);
extern void seg6_hmac_exit(void);
extern int seg6_hmac_net_init(struct net *net);
extern void seg6_hmac_net_exit(struct net *net);
#endif