143 строки
3.6 KiB
C
143 строки
3.6 KiB
C
/*
|
|
* net/ife/ife.c - Inter-FE protocol based on ForCES WG InterFE LFB
|
|
* Copyright (c) 2015 Jamal Hadi Salim <jhs@mojatatu.com>
|
|
* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
|
|
*
|
|
* Refer to: draft-ietf-forces-interfelfb-03 and netdev01 paper:
|
|
* "Distributing Linux Traffic Control Classifier-Action Subsystem"
|
|
* Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/netlink.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <net/ife.h>
|
|
|
|
struct ifeheadr {
|
|
__be16 metalen;
|
|
u8 tlv_data[];
|
|
};
|
|
|
|
void *ife_encode(struct sk_buff *skb, u16 metalen)
|
|
{
|
|
/* OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
|
|
* where ORIGDATA = original ethernet header ...
|
|
*/
|
|
int hdrm = metalen + IFE_METAHDRLEN;
|
|
int total_push = hdrm + skb->dev->hard_header_len;
|
|
struct ifeheadr *ifehdr;
|
|
struct ethhdr *iethh; /* inner ether header */
|
|
int skboff = 0;
|
|
int err;
|
|
|
|
err = skb_cow_head(skb, total_push);
|
|
if (unlikely(err))
|
|
return NULL;
|
|
|
|
iethh = (struct ethhdr *) skb->data;
|
|
|
|
__skb_push(skb, total_push);
|
|
memcpy(skb->data, iethh, skb->dev->hard_header_len);
|
|
skb_reset_mac_header(skb);
|
|
skboff += skb->dev->hard_header_len;
|
|
|
|
/* total metadata length */
|
|
ifehdr = (struct ifeheadr *) (skb->data + skboff);
|
|
metalen += IFE_METAHDRLEN;
|
|
ifehdr->metalen = htons(metalen);
|
|
|
|
return ifehdr->tlv_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ife_encode);
|
|
|
|
void *ife_decode(struct sk_buff *skb, u16 *metalen)
|
|
{
|
|
struct ifeheadr *ifehdr;
|
|
int total_pull;
|
|
u16 ifehdrln;
|
|
|
|
ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
|
|
ifehdrln = ntohs(ifehdr->metalen);
|
|
total_pull = skb->dev->hard_header_len + ifehdrln;
|
|
|
|
if (unlikely(ifehdrln < 2))
|
|
return NULL;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, total_pull)))
|
|
return NULL;
|
|
|
|
skb_set_mac_header(skb, total_pull);
|
|
__skb_pull(skb, total_pull);
|
|
*metalen = ifehdrln - IFE_METAHDRLEN;
|
|
|
|
return &ifehdr->tlv_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ife_decode);
|
|
|
|
struct meta_tlvhdr {
|
|
__be16 type;
|
|
__be16 len;
|
|
};
|
|
|
|
/* Caller takes care of presenting data in network order
|
|
*/
|
|
void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen)
|
|
{
|
|
struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
|
|
|
|
*dlen = ntohs(tlv->len) - NLA_HDRLEN;
|
|
*attrtype = ntohs(tlv->type);
|
|
|
|
if (totlen)
|
|
*totlen = nla_total_size(*dlen);
|
|
|
|
return skbdata + sizeof(struct meta_tlvhdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ife_tlv_meta_decode);
|
|
|
|
void *ife_tlv_meta_next(void *skbdata)
|
|
{
|
|
struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
|
|
u16 tlvlen = ntohs(tlv->len);
|
|
|
|
tlvlen = NLA_ALIGN(tlvlen);
|
|
|
|
return skbdata + tlvlen;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ife_tlv_meta_next);
|
|
|
|
/* Caller takes care of presenting data in network order
|
|
*/
|
|
int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
|
|
{
|
|
__be32 *tlv = (__be32 *) (skbdata);
|
|
u16 totlen = nla_total_size(dlen); /*alignment + hdr */
|
|
char *dptr = (char *) tlv + NLA_HDRLEN;
|
|
u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN);
|
|
|
|
*tlv = htonl(htlv);
|
|
memset(dptr, 0, totlen - NLA_HDRLEN);
|
|
memcpy(dptr, dval, dlen);
|
|
|
|
return totlen;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim <jhs@mojatatu.com>");
|
|
MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
|
|
MODULE_DESCRIPTION("Inter-FE LFB action");
|
|
MODULE_LICENSE("GPL");
|