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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include <rte_ip.h>
#include "log.h"
#include "tx_pkt.h"
#include "task_base.h"
#include "task_init.h"
#include "mpls.h"
#include "defines.h"
#include "prefetch.h"
#include "qinq.h"
#include "prox_assert.h"
#include "etypes.h"
struct task_untag {
struct task_base base;
uint16_t etype;
};
static void init_task_untag(struct task_base *tbase, __attribute__((unused)) struct task_args *targ)
{
struct task_untag *task = (struct task_untag *)tbase;
task->etype = targ->etype;
}
static inline uint8_t handle_untag(struct task_untag *task, struct rte_mbuf *mbuf);
static int handle_untag_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
struct task_untag *task = (struct task_untag *)tbase;
uint8_t out[MAX_PKT_BURST];
uint16_t j;
prefetch_first(mbufs, n_pkts);
for (j = 0; j + PREFETCH_OFFSET < n_pkts; ++j) {
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(mbufs[j + PREFETCH_OFFSET]);
PREFETCH0(rte_pktmbuf_mtod(mbufs[j + PREFETCH_OFFSET - 1], void *));
#endif
out[j] = handle_untag(task, mbufs[j]);
}
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(rte_pktmbuf_mtod(mbufs[n_pkts - 1], void *));
for (; j < n_pkts; ++j) {
out[j] = handle_untag(task, mbufs[j]);
}
#endif
return task->base.tx_pkt(&task->base, mbufs, n_pkts, out);
}
static inline uint8_t untag_mpls(struct rte_mbuf *mbuf, prox_rte_ether_hdr *peth)
{
prox_rte_ether_hdr *pneweth = (prox_rte_ether_hdr *)rte_pktmbuf_adj(mbuf, 4);
const struct mpls_hdr *mpls = (const struct mpls_hdr *)(peth + 1);
const prox_rte_ipv4_hdr *pip = (const prox_rte_ipv4_hdr *)(mpls + 1);
PROX_ASSERT(pneweth);
if (mpls->bos == 0) {
// Double MPLS tag
pneweth = (prox_rte_ether_hdr *)rte_pktmbuf_adj(mbuf, 4);
PROX_ASSERT(pneweth);
}
if ((pip->version_ihl >> 4) == 4) {
pneweth->ether_type = ETYPE_IPv4;
return 0;
}
else if ((pip->version_ihl >> 4) == 6) {
pneweth->ether_type = ETYPE_IPv6;
return 0;
}
plog_warn("Failed Decoding MPLS Packet - neither IPv4 neither IPv6: version %u\n", pip->version_ihl);
return OUT_DISCARD;
}
static uint8_t untag_qinq(struct rte_mbuf *mbuf, struct qinq_hdr *qinq)
{
if ((qinq->cvlan.eth_proto != ETYPE_VLAN)) {
plog_warn("Unexpected proto in QinQ = %#04x\n", qinq->cvlan.eth_proto);
return OUT_DISCARD;
}
rte_pktmbuf_adj(mbuf, sizeof(struct qinq_hdr) - sizeof(prox_rte_ether_hdr));
return 0;
}
static inline uint8_t handle_untag(struct task_untag *task, struct rte_mbuf *mbuf)
{
prox_rte_ether_hdr *peth = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *);
const uint16_t etype = peth->ether_type;
if (etype != task->etype) {
plog_warn("Failed Removing %04x tag: ether_type = %#06x\n", task->etype, peth->ether_type);
return OUT_DISCARD;
}
switch (etype) {
case ETYPE_MPLSU:
/* MPLS Decapsulation */
return untag_mpls(mbuf, peth);
case ETYPE_LLDP:
return OUT_DISCARD;
case ETYPE_IPv6:
return 0;
case ETYPE_IPv4:
return 0;
case ETYPE_8021ad:
case ETYPE_VLAN:
return untag_qinq(mbuf, (struct qinq_hdr *)peth);
default:
plog_warn("Failed untagging header: ether_type = %#06x is not supported\n", peth->ether_type);
return OUT_DISCARD;
}
}
static struct task_init task_init_untag = {
.mode_str = "untag",
.init = init_task_untag,
.handle = handle_untag_bulk,
.size = sizeof(struct task_untag)
};
__attribute__((constructor)) static void reg_task_untag(void)
{
reg_task(&task_init_untag);
}
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