summaryrefslogtreecommitdiffstats
path: root/VNFs/DPPD-PROX/handle_nsh.c
blob: 6d67f99d8b35b28a16aec962bea78cd05e1c3b47 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/*
// 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_ethdev.h>
#include <rte_ether.h>
#include <rte_ip.h>
#include <rte_udp.h>
#include <rte_version.h>
#if RTE_VERSION >= RTE_VERSION_NUM(19,11,0,0)
#include <rte_vxlan.h>
#endif

#include "vxlangpe_nsh.h"
#include "task_base.h"
#include "tx_pkt.h"
#include "task_init.h"
#include "thread_generic.h"
#include "prefetch.h"
#include "log.h"

#define VXLAN_GPE_HDR_SZ sizeof(prox_rte_ether_hdr) + sizeof(prox_rte_ipv4_hdr) + sizeof(prox_rte_udp_hdr) + sizeof(prox_rte_vxlan_gpe_hdr) + sizeof(struct nsh_hdr)
#define ETHER_NSH_TYPE 0x4F89 /* 0x894F in little endian */
#define VXLAN_GPE_NSH_TYPE 0xB612 /* 4790 in little endian */
#define VXLAN_GPE_NP 0x4

uint16_t decap_nsh_packets(struct rte_mbuf **mbufs, uint16_t n_pkts);
uint16_t encap_nsh_packets(struct rte_mbuf **mbufs, uint16_t n_pkts);

struct task_decap_nsh {
	struct task_base base;
};

struct task_encap_nsh {
	struct task_base base;
};

static void init_task_decap_nsh(__attribute__((unused)) struct task_base *tbase,
			     __attribute__((unused)) struct task_args *targ)
{
	return;
}

static inline uint8_t handle_decap_nsh(__attribute__((unused)) struct task_decap_nsh *task, struct rte_mbuf *mbuf)
{
	prox_rte_ether_hdr *eth_hdr = NULL;
	prox_rte_udp_hdr *udp_hdr = NULL;
	prox_rte_vxlan_gpe_hdr *vxlan_gpe_hdr = NULL;
	uint16_t hdr_len;

	eth_hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *);
	if (eth_hdr->ether_type == ETHER_NSH_TYPE) {
		/* "decapsulate" Ethernet + NSH header by moving packet pointer */
		hdr_len = sizeof(prox_rte_ether_hdr) + sizeof(struct nsh_hdr);

		mbuf->data_len = (uint16_t)(mbuf->data_len - hdr_len);
		mbuf->data_off += hdr_len;
		mbuf->pkt_len = (uint32_t)(mbuf->pkt_len - hdr_len);
		/* save length of header in reserved 16bits of rte_mbuf */
		mbuf->udata64 = hdr_len;
	}
	else {
		if (mbuf->data_len < VXLAN_GPE_HDR_SZ) {
			mbuf->udata64 = 0;
			return 0;
		}

		/* check the UDP destination port */
		udp_hdr = (prox_rte_udp_hdr *)(((unsigned char *)eth_hdr) + sizeof(prox_rte_ether_hdr) + sizeof(prox_rte_ipv4_hdr));
		if (udp_hdr->dst_port != VXLAN_GPE_NSH_TYPE) {
			mbuf->udata64 = 0;
			return 0;
		}

		/* check the Next Protocol field in VxLAN-GPE header */
		vxlan_gpe_hdr = (prox_rte_vxlan_gpe_hdr *)(((unsigned char *)eth_hdr) + sizeof(prox_rte_ether_hdr) + sizeof(prox_rte_ipv4_hdr) + sizeof(prox_rte_udp_hdr));
		if (vxlan_gpe_hdr->proto != VXLAN_GPE_NP) {
			mbuf->udata64 = 0;
			return 0;
		}

		/* "decapsulate" VxLAN-GPE + NSH header by moving packet pointer */
		hdr_len = VXLAN_GPE_HDR_SZ;

		mbuf->data_len = (uint16_t)(mbuf->data_len - hdr_len);
		mbuf->data_off += hdr_len;
		mbuf->pkt_len  = (uint32_t)(mbuf->pkt_len - hdr_len);
		/* save length of header in reserved 16bits of rte_mbuf */
		mbuf->udata64 = hdr_len;
	}

	return 0;
}

static int handle_decap_nsh_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
	struct task_decap_nsh *task = (struct task_decap_nsh *)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_decap_nsh(task, mbufs[j]);
	}
#ifdef PROX_PREFETCH_OFFSET
	PREFETCH0(rte_pktmbuf_mtod(mbufs[n_pkts - 1], void *));
	for (; j < n_pkts; ++j) {
		out[j] = handle_decap_nsh(task, mbufs[j]);
	}
#endif
	return task->base.tx_pkt(&task->base, mbufs, n_pkts, out);
}

static void init_task_encap_nsh(__attribute__((unused)) struct task_base *tbase,
			      __attribute__((unused)) struct task_args *targ)
{
	return;
}

static inline uint8_t handle_encap_nsh(__attribute__((unused)) struct task_encap_nsh *task, struct rte_mbuf *mbuf)
{
	prox_rte_ether_hdr *eth_hdr = NULL;
	struct nsh_hdr *nsh_hdr = NULL;
	prox_rte_udp_hdr *udp_hdr = NULL;
	prox_rte_vxlan_gpe_hdr *vxlan_gpe_hdr = NULL;
	uint16_t hdr_len;

	if (mbuf == NULL)
		return 0;
	if (mbuf->udata64 == 0)
		return 0;

	/* use header length saved in reserved 16bits of rte_mbuf to
	   "encapsulate" transport + NSH header by moving packet pointer */
	mbuf->data_len = (uint16_t)(mbuf->data_len + mbuf->udata64);
	mbuf->data_off -= mbuf->udata64;
	mbuf->pkt_len  = (uint32_t)(mbuf->pkt_len + mbuf->udata64);

	eth_hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *);
	if (eth_hdr->ether_type == ETHER_NSH_TYPE) {
		nsh_hdr = (struct nsh_hdr *) (((unsigned char *)eth_hdr) + sizeof(prox_rte_ether_hdr));

		/* decrement Service Index in NSH header */
		if (nsh_hdr->sf_index > 0)
			nsh_hdr->sf_index -= 1;
	}
	else {
		/* "encapsulate" VxLAN-GPE + NSH header by moving packet pointer */
		if (mbuf->data_len < VXLAN_GPE_HDR_SZ)
			return 0;

		/* check the UDP destination port */
		udp_hdr = (prox_rte_udp_hdr *)(((unsigned char *)eth_hdr) + sizeof(prox_rte_ether_hdr) + sizeof(prox_rte_ipv4_hdr));
		if (udp_hdr->dst_port != VXLAN_GPE_NSH_TYPE)
			return 0;

		/* check the Next Protocol field in VxLAN-GPE header */
		vxlan_gpe_hdr = (prox_rte_vxlan_gpe_hdr *)(((unsigned char *)eth_hdr) + sizeof(prox_rte_ether_hdr) + sizeof(prox_rte_ipv4_hdr) + sizeof(prox_rte_udp_hdr));
		if (vxlan_gpe_hdr->proto != VXLAN_GPE_NP)
			return 0;

		/* decrement Service Index in NSH header */
		nsh_hdr = (struct nsh_hdr *)(((unsigned char *)vxlan_gpe_hdr) + sizeof(prox_rte_vxlan_gpe_hdr));
		if (nsh_hdr->sf_index > 0)
			nsh_hdr->sf_index -= 1;
	}

	return 0;
}

static int handle_encap_nsh_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
	struct task_encap_nsh *task = (struct task_encap_nsh *)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_encap_nsh(task, mbufs[j]);
	}
#ifdef PROX_PREFETCH_OFFSET
	PREFETCH0(rte_pktmbuf_mtod(mbufs[n_pkts - 1], void *));
	for (; j < n_pkts; ++j) {
		out[j] = handle_encap_nsh(task, mbufs[j]);
	}
#endif
	return task->base.tx_pkt(&task->base, mbufs, n_pkts, out);
}

static struct task_init task_init_decap_nsh = {
	.mode_str = "decapnsh",
	.init = init_task_decap_nsh,
	.handle = handle_decap_nsh_bulk,
	.thread_x = thread_generic,
	.size = sizeof(struct task_decap_nsh)
};

static struct task_init task_init_encap_nsh = {
	.mode_str = "encapnsh",
	.init = init_task_encap_nsh,
	.handle = handle_encap_nsh_bulk,
	.size = sizeof(struct task_encap_nsh)
};

__attribute__((constructor)) static void reg_task_nshtag(void)
{
	reg_task(&task_init_decap_nsh);
	reg_task(&task_init_encap_nsh);
}