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1ce8460496
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>
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*
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* net/ife/ife.c - Inter-FE protocol based on ForCES WG InterFE LFB
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* Copyright (c) 2015 Jamal Hadi Salim <jhs@mojatatu.com>
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* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
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*
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* Refer to: draft-ietf-forces-interfelfb-03 and netdev01 paper:
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* "Distributing Linux Traffic Control Classifier-Action Subsystem"
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* Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <net/net_namespace.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/etherdevice.h>
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#include <net/ife.h>
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struct ifeheadr {
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__be16 metalen;
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u8 tlv_data[];
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};
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void *ife_encode(struct sk_buff *skb, u16 metalen)
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{
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/* OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
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* where ORIGDATA = original ethernet header ...
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*/
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int hdrm = metalen + IFE_METAHDRLEN;
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int total_push = hdrm + skb->dev->hard_header_len;
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struct ifeheadr *ifehdr;
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struct ethhdr *iethh; /* inner ether header */
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int skboff = 0;
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int err;
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err = skb_cow_head(skb, total_push);
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if (unlikely(err))
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return NULL;
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iethh = (struct ethhdr *) skb->data;
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__skb_push(skb, total_push);
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memcpy(skb->data, iethh, skb->dev->hard_header_len);
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skb_reset_mac_header(skb);
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skboff += skb->dev->hard_header_len;
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/* total metadata length */
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ifehdr = (struct ifeheadr *) (skb->data + skboff);
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metalen += IFE_METAHDRLEN;
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ifehdr->metalen = htons(metalen);
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return ifehdr->tlv_data;
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}
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EXPORT_SYMBOL_GPL(ife_encode);
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void *ife_decode(struct sk_buff *skb, u16 *metalen)
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{
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struct ifeheadr *ifehdr;
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int total_pull;
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u16 ifehdrln;
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ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
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ifehdrln = ntohs(ifehdr->metalen);
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total_pull = skb->dev->hard_header_len + ifehdrln;
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if (unlikely(ifehdrln < 2))
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return NULL;
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if (unlikely(!pskb_may_pull(skb, total_pull)))
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return NULL;
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skb_set_mac_header(skb, total_pull);
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__skb_pull(skb, total_pull);
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*metalen = ifehdrln - IFE_METAHDRLEN;
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return &ifehdr->tlv_data;
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}
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EXPORT_SYMBOL_GPL(ife_decode);
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struct meta_tlvhdr {
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__be16 type;
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__be16 len;
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};
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/* Caller takes care of presenting data in network order
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*/
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void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen)
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{
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struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
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*dlen = ntohs(tlv->len) - NLA_HDRLEN;
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*attrtype = ntohs(tlv->type);
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if (totlen)
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*totlen = nla_total_size(*dlen);
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return skbdata + sizeof(struct meta_tlvhdr);
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}
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EXPORT_SYMBOL_GPL(ife_tlv_meta_decode);
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void *ife_tlv_meta_next(void *skbdata)
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{
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struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
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u16 tlvlen = ntohs(tlv->len);
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tlvlen = NLA_ALIGN(tlvlen);
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return skbdata + tlvlen;
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}
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EXPORT_SYMBOL_GPL(ife_tlv_meta_next);
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/* Caller takes care of presenting data in network order
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*/
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int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
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{
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__be32 *tlv = (__be32 *) (skbdata);
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u16 totlen = nla_total_size(dlen); /*alignment + hdr */
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char *dptr = (char *) tlv + NLA_HDRLEN;
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u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN);
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*tlv = htonl(htlv);
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memset(dptr, 0, totlen - NLA_HDRLEN);
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memcpy(dptr, dval, dlen);
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return totlen;
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}
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EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
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MODULE_AUTHOR("Jamal Hadi Salim <jhs@mojatatu.com>");
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MODULE_AUTHOR("Yotam Gigi <yotamg@mellanox.com>");
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MODULE_DESCRIPTION("Inter-FE LFB action");
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MODULE_LICENSE("GPL");
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