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Release 4.11 net/ife/ife.c

Directory: net/ife
/*
 * 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; }

Contributors

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Yotam Gigi151100.00%1100.00%
Total151100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Yotam Gigi119100.00%1100.00%
Total119100.00%1100.00%

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); }

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PersonTokensPropCommitsCommitProp
Yotam Gigi78100.00%1100.00%
Total78100.00%1100.00%

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; }

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PersonTokensPropCommitsCommitProp
Yotam Gigi44100.00%1100.00%
Total44100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Yotam Gigi97100.00%1100.00%
Total97100.00%1100.00%

EXPORT_SYMBOL_GPL(ife_tlv_meta_encode); MODULE_AUTHOR("Jamal Hadi Salim <jhs@mojatatu.com>"); MODULE_AUTHOR("Yotam Gigi <yotamg@mellanox.com>"); MODULE_DESCRIPTION("Inter-FE LFB action"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Yotam Gigi599100.00%1100.00%
Total599100.00%1100.00%
Directory: net/ife
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