x86/tracing: Disentangle pagefault and resched IPI tracing key
[linux-stable.git] / net / ife / ife.c
blobf360341c72eb10c05913645456f14ef1797ecff8
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>
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
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.
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>
29 struct ifeheadr {
30 __be16 metalen;
31 u8 tlv_data[];
34 void *ife_encode(struct sk_buff *skb, u16 metalen)
36 /* OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
37 * where ORIGDATA = original ethernet header ...
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;
46 err = skb_cow_head(skb, total_push);
47 if (unlikely(err))
48 return NULL;
50 iethh = (struct ethhdr *) skb->data;
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;
57 /* total metadata length */
58 ifehdr = (struct ifeheadr *) (skb->data + skboff);
59 metalen += IFE_METAHDRLEN;
60 ifehdr->metalen = htons(metalen);
62 return ifehdr->tlv_data;
64 EXPORT_SYMBOL_GPL(ife_encode);
66 void *ife_decode(struct sk_buff *skb, u16 *metalen)
68 struct ifeheadr *ifehdr;
69 int total_pull;
70 u16 ifehdrln;
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;
76 if (unlikely(ifehdrln < 2))
77 return NULL;
79 if (unlikely(!pskb_may_pull(skb, total_pull)))
80 return NULL;
82 skb_set_mac_header(skb, total_pull);
83 __skb_pull(skb, total_pull);
84 *metalen = ifehdrln - IFE_METAHDRLEN;
86 return &ifehdr->tlv_data;
88 EXPORT_SYMBOL_GPL(ife_decode);
90 struct meta_tlvhdr {
91 __be16 type;
92 __be16 len;
95 /* Caller takes care of presenting data in network order
97 void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen)
99 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
101 *dlen = ntohs(tlv->len) - NLA_HDRLEN;
102 *attrtype = ntohs(tlv->type);
104 if (totlen)
105 *totlen = nla_total_size(*dlen);
107 return skbdata + sizeof(struct meta_tlvhdr);
109 EXPORT_SYMBOL_GPL(ife_tlv_meta_decode);
111 void *ife_tlv_meta_next(void *skbdata)
113 struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
114 u16 tlvlen = ntohs(tlv->len);
116 tlvlen = NLA_ALIGN(tlvlen);
118 return skbdata + tlvlen;
120 EXPORT_SYMBOL_GPL(ife_tlv_meta_next);
122 /* Caller takes care of presenting data in network order
124 int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
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);
131 *tlv = htonl(htlv);
132 memset(dptr, 0, totlen - NLA_HDRLEN);
133 memcpy(dptr, dval, dlen);
135 return totlen;
137 EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
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");