tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
net: Introduce ife encapsulation module
This module is responsible for the ife encapsulation protocol
encode/decode logics. That module can:
- ife_encode: encode skb and reserve space for the ife meta header
- ife_decode: decode skb and extract the meta header size
- ife_tlv_meta_encode - encodes one tlv entry into the reserved ife
header space.
- ife_tlv_meta_decode - decodes one tlv entry from the packet
- ife_tlv_meta_next - advance to the next tlv
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
authored by
Yotam Gigi
and committed by
David S. Miller
1ce84604
1d5e7c85
+242
+7
MAINTAINERS
+7
MAINTAINERS
···
6250
6250
F: include/net/ieee802154_netdev.h
6251
6251
F: Documentation/networking/ieee802154.txt
6252
6252
6253
+
IFE PROTOCOL
6254
+
M: Yotam Gigi <yotamg@mellanox.com>
6255
+
M: Jamal Hadi Salim <jhs@mojatatu.com>
6256
+
F: net/ife
6257
+
F: include/net/ife.h
6258
+
F: include/uapi/linux/ife.h
6259
+
6253
6260
IGORPLUG-USB IR RECEIVER
6254
6261
M: Sean Young <sean@mess.org>
6255
6262
L: linux-media@vger.kernel.org
+51
include/net/ife.h
+51
include/net/ife.h
···
1
+
#ifndef __NET_IFE_H
2
+
#define __NET_IFE_H
3
+
4
+
#include <linux/etherdevice.h>
5
+
#include <linux/rtnetlink.h>
6
+
#include <linux/module.h>
7
+
#include <uapi/linux/ife.h>
8
+
9
+
#if IS_ENABLED(CONFIG_NET_IFE)
10
+
11
+
void *ife_encode(struct sk_buff *skb, u16 metalen);
12
+
void *ife_decode(struct sk_buff *skb, u16 *metalen);
13
+
14
+
void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen);
15
+
int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen,
16
+
const void *dval);
17
+
18
+
void *ife_tlv_meta_next(void *skbdata);
19
+
20
+
#else
21
+
22
+
static inline void *ife_encode(struct sk_buff *skb, u16 metalen)
23
+
{
24
+
return NULL;
25
+
}
26
+
27
+
static inline void *ife_decode(struct sk_buff *skb, u16 *metalen)
28
+
{
29
+
return NULL;
30
+
}
31
+
32
+
static inline void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen,
33
+
u16 *totlen)
34
+
{
35
+
return NULL;
36
+
}
37
+
38
+
static inline int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen,
39
+
const void *dval)
40
+
{
41
+
return 0;
42
+
}
43
+
44
+
static inline void *ife_tlv_meta_next(void *skbdata)
45
+
{
46
+
return NULL;
47
+
}
48
+
49
+
#endif
50
+
51
+
#endif /* __NET_IFE_H */
+1
include/uapi/linux/Kbuild
+1
include/uapi/linux/Kbuild
+18
include/uapi/linux/ife.h
+18
include/uapi/linux/ife.h
···
1
+
#ifndef __UAPI_IFE_H
2
+
#define __UAPI_IFE_H
3
+
4
+
#define IFE_METAHDRLEN 2
5
+
6
+
enum {
7
+
IFE_META_SKBMARK = 1,
8
+
IFE_META_HASHID,
9
+
IFE_META_PRIO,
10
+
IFE_META_QMAP,
11
+
IFE_META_TCINDEX,
12
+
__IFE_META_MAX
13
+
};
14
+
15
+
/*Can be overridden at runtime by module option*/
16
+
#define IFE_META_MAX (__IFE_META_MAX - 1)
17
+
18
+
#endif
+1
net/Kconfig
+1
net/Kconfig
+1
net/Makefile
+1
net/Makefile
+16
net/ife/Kconfig
+16
net/ife/Kconfig
···
1
+
#
2
+
# IFE subsystem configuration
3
+
#
4
+
5
+
menuconfig NET_IFE
6
+
depends on NET
7
+
tristate "Inter-FE based on IETF ForCES InterFE LFB"
8
+
default n
9
+
help
10
+
Say Y here to add support of IFE encapsulation protocol
11
+
For details refer to netdev01 paper:
12
+
"Distributing Linux Traffic Control Classifier-Action Subsystem"
13
+
Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
14
+
15
+
To compile this support as a module, choose M here: the module will
16
+
be called ife.
+5
net/ife/Makefile
+5
net/ife/Makefile
+142
net/ife/ife.c
+142
net/ife/ife.c
···
1
+
/*
2
+
* net/ife/ife.c - Inter-FE protocol based on ForCES WG InterFE LFB
3
+
* Copyright (c) 2015 Jamal Hadi Salim <jhs@mojatatu.com>
4
+
* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
5
+
*
6
+
* Refer to: draft-ietf-forces-interfelfb-03 and netdev01 paper:
7
+
* "Distributing Linux Traffic Control Classifier-Action Subsystem"
8
+
* Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
9
+
*
10
+
* This program is free software; you can redistribute it and/or modify
11
+
* it under the terms of the GNU General Public License as published by
12
+
* the Free Software Foundation.
13
+
*/
14
+
15
+
#include <linux/types.h>
16
+
#include <linux/kernel.h>
17
+
#include <linux/string.h>
18
+
#include <linux/errno.h>
19
+
#include <linux/skbuff.h>
20
+
#include <linux/rtnetlink.h>
21
+
#include <linux/module.h>
22
+
#include <linux/init.h>
23
+
#include <net/net_namespace.h>
24
+
#include <net/netlink.h>
25
+
#include <net/pkt_sched.h>
26
+
#include <linux/etherdevice.h>
27
+
#include <net/ife.h>
28
+
29
+
struct ifeheadr {
30
+
__be16 metalen;
31
+
u8 tlv_data[];
32
+
};
33
+
34
+
void *ife_encode(struct sk_buff *skb, u16 metalen)
35
+
{
36
+
/* OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
37
+
* where ORIGDATA = original ethernet header ...
38
+
*/
39
+
int hdrm = metalen + IFE_METAHDRLEN;
40
+
int total_push = hdrm + skb->dev->hard_header_len;
41
+
struct ifeheadr *ifehdr;
42
+
struct ethhdr *iethh; /* inner ether header */
43
+
int skboff = 0;
44
+
int err;
45
+
46
+
err = skb_cow_head(skb, total_push);
47
+
if (unlikely(err))
48
+
return NULL;
49
+
50
+
iethh = (struct ethhdr *) skb->data;
51
+
52
+
__skb_push(skb, total_push);
53
+
memcpy(skb->data, iethh, skb->dev->hard_header_len);
54
+
skb_reset_mac_header(skb);
55
+
skboff += skb->dev->hard_header_len;
56
+
57
+
/* total metadata length */
58
+
ifehdr = (struct ifeheadr *) (skb->data + skboff);
59
+
metalen += IFE_METAHDRLEN;
60
+
ifehdr->metalen = htons(metalen);
61
+
62
+
return ifehdr->tlv_data;
63
+
}
64
+
EXPORT_SYMBOL_GPL(ife_encode);
65
+
66
+
void *ife_decode(struct sk_buff *skb, u16 *metalen)
67
+
{
68
+
struct ifeheadr *ifehdr;
69
+
int total_pull;
70
+
u16 ifehdrln;
71
+
72
+
ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
73
+
ifehdrln = ntohs(ifehdr->metalen);
74
+
total_pull = skb->dev->hard_header_len + ifehdrln;
75
+
76
+
if (unlikely(ifehdrln < 2))
77
+
return NULL;
78
+
79
+
if (unlikely(!pskb_may_pull(skb, total_pull)))
80
+
return NULL;
81
+
82
+
skb_set_mac_header(skb, total_pull);
83
+
__skb_pull(skb, total_pull);
84
+
*metalen = ifehdrln - IFE_METAHDRLEN;
85
+
86
+
return &ifehdr->tlv_data;
87
+
}
88
+
EXPORT_SYMBOL_GPL(ife_decode);
89
+
90
+
struct meta_tlvhdr {
91
+
__be16 type;
92
+
__be16 len;
93
+
};
94
+
95
+
/* Caller takes care of presenting data in network order
96
+
*/
97
+
void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen)
98
+
{
99
+
struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
100
+
101
+
*dlen = ntohs(tlv->len) - NLA_HDRLEN;
102
+
*attrtype = ntohs(tlv->type);
103
+
104
+
if (totlen)
105
+
*totlen = nla_total_size(*dlen);
106
+
107
+
return skbdata + sizeof(struct meta_tlvhdr);
108
+
}
109
+
EXPORT_SYMBOL_GPL(ife_tlv_meta_decode);
110
+
111
+
void *ife_tlv_meta_next(void *skbdata)
112
+
{
113
+
struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
114
+
u16 tlvlen = ntohs(tlv->len);
115
+
116
+
tlvlen = NLA_ALIGN(tlvlen);
117
+
118
+
return skbdata + tlvlen;
119
+
}
120
+
EXPORT_SYMBOL_GPL(ife_tlv_meta_next);
121
+
122
+
/* Caller takes care of presenting data in network order
123
+
*/
124
+
int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
125
+
{
126
+
__be32 *tlv = (__be32 *) (skbdata);
127
+
u16 totlen = nla_total_size(dlen); /*alignment + hdr */
128
+
char *dptr = (char *) tlv + NLA_HDRLEN;
129
+
u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN);
130
+
131
+
*tlv = htonl(htlv);
132
+
memset(dptr, 0, totlen - NLA_HDRLEN);
133
+
memcpy(dptr, dval, dlen);
134
+
135
+
return totlen;
136
+
}
137
+
EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
138
+
139
+
MODULE_AUTHOR("Jamal Hadi Salim <jhs@mojatatu.com>");
140
+
MODULE_AUTHOR("Yotam Gigi <yotamg@mellanox.com>");
141
+
MODULE_DESCRIPTION("Inter-FE LFB action");
142
+
MODULE_LICENSE("GPL");