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Commit d1df6fd8 authored by David Lebrun's avatar David Lebrun Committed by David S. Miller
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ipv6: sr: define core operations for seg6local lightweight tunnel 

This patch implements a new type of lightweight tunnel named seg6local.
A seg6local lwt is defined by a type of action and a set of parameters.
The action represents the operation to perform on the packets matching the
lwt's route, and is not necessarily an encapsulation. The set of parameters
are arguments for the processing function.

Each action is defined in a struct seg6_action_desc within
seg6_action_table[]. This structure contains the action, mandatory
attributes, the processing function, and a static headroom size required by
the action. The mandatory attributes are encoded as a bitmask field. The
static headroom is set to a non-zero value when the processing function
always add a constant number of bytes to the skb (e.g. the header size for
encapsulations).

To facilitate rtnetlink-related operations such as parsing, fill_encap,
and cmp_encap, each type of action parameter is associated to three
function pointers, in seg6_action_params[].

All actions defined in seg6_local.h are detailed in [1].

[1] https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-01



Signed-off-by: default avatarDavid Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b04c80d3

include/linux/seg6_local.h

0 → 100644
+6 −0
Original line number Diff line number Diff line 
#ifndef _LINUX_SEG6_LOCAL_H

#define _LINUX_SEG6_LOCAL_H



#include <uapi/linux/seg6_local.h>



#endif

include/net/seg6.h

+2 −0
Original line number Diff line number Diff line
@@ -56,6 +56,8 @@ extern int seg6_init(void); 
extern void seg6_exit(void);

extern int seg6_iptunnel_init(void);

extern void seg6_iptunnel_exit(void);

extern int seg6_local_init(void);

extern void seg6_local_exit(void);



extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);

extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);

include/uapi/linux/lwtunnel.h

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ enum lwtunnel_encap_types { 
	LWTUNNEL_ENCAP_IP6,

	LWTUNNEL_ENCAP_SEG6,

	LWTUNNEL_ENCAP_BPF,

	LWTUNNEL_ENCAP_SEG6_LOCAL,

	__LWTUNNEL_ENCAP_MAX,

};

include/uapi/linux/seg6_local.h

0 → 100644
+68 −0
Original line number Diff line number Diff line 
/*

 *  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 _UAPI_LINUX_SEG6_LOCAL_H

#define _UAPI_LINUX_SEG6_LOCAL_H



#include <linux/seg6.h>



enum {

	SEG6_LOCAL_UNSPEC,

	SEG6_LOCAL_ACTION,

	SEG6_LOCAL_SRH,

	SEG6_LOCAL_TABLE,

	SEG6_LOCAL_NH4,

	SEG6_LOCAL_NH6,

	SEG6_LOCAL_IIF,

	SEG6_LOCAL_OIF,

	__SEG6_LOCAL_MAX,

};

#define SEG6_LOCAL_MAX (__SEG6_LOCAL_MAX - 1)



enum {

	SEG6_LOCAL_ACTION_UNSPEC	= 0,

	/* node segment */

	SEG6_LOCAL_ACTION_END		= 1,

	/* adjacency segment (IPv6 cross-connect) */

	SEG6_LOCAL_ACTION_END_X		= 2,

	/* lookup of next seg NH in table */

	SEG6_LOCAL_ACTION_END_T		= 3,

	/* decap and L2 cross-connect */

	SEG6_LOCAL_ACTION_END_DX2	= 4,

	/* decap and IPv6 cross-connect */

	SEG6_LOCAL_ACTION_END_DX6	= 5,

	/* decap and IPv4 cross-connect */

	SEG6_LOCAL_ACTION_END_DX4	= 6,

	/* decap and lookup of DA in v6 table */

	SEG6_LOCAL_ACTION_END_DT6	= 7,

	/* decap and lookup of DA in v4 table */

	SEG6_LOCAL_ACTION_END_DT4	= 8,

	/* binding segment with insertion */

	SEG6_LOCAL_ACTION_END_B6	= 9,

	/* binding segment with encapsulation */

	SEG6_LOCAL_ACTION_END_B6_ENCAP	= 10,

	/* binding segment with MPLS encap */

	SEG6_LOCAL_ACTION_END_BM	= 11,

	/* lookup last seg in table */

	SEG6_LOCAL_ACTION_END_S		= 12,

	/* forward to SR-unaware VNF with static proxy */

	SEG6_LOCAL_ACTION_END_AS	= 13,

	/* forward to SR-unaware VNF with masquerading */

	SEG6_LOCAL_ACTION_END_AM	= 14,



	__SEG6_LOCAL_ACTION_MAX,

};



#define SEG6_LOCAL_ACTION_MAX (__SEG6_LOCAL_ACTION_MAX - 1)



#endif

net/core/lwtunnel.c

+2 −0
Original line number Diff line number Diff line
@@ -44,6 +44,8 @@ static const char *lwtunnel_encap_str(enum lwtunnel_encap_types encap_type) 
		return "SEG6";

	case LWTUNNEL_ENCAP_BPF:

		return "BPF";

	case LWTUNNEL_ENCAP_SEG6_LOCAL:

		return "SEG6LOCAL";

	case LWTUNNEL_ENCAP_IP6:

	case LWTUNNEL_ENCAP_IP:

	case LWTUNNEL_ENCAP_NONE: