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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 "genl4_stream_udp.h"
#include "mbuf_utils.h"
int stream_udp_is_ended(struct stream_ctx *ctx)
{
return ctx->cur_action == ctx->stream_cfg->n_actions;
}
static void update_token_times(struct stream_ctx *ctx)
{
uint64_t now = rte_rdtsc();
token_time_update(&ctx->token_time_other, now);
token_time_update(&ctx->token_time, now);
}
int stream_udp_proc(struct stream_ctx *ctx, struct rte_mbuf *mbuf, struct l4_meta *l4_meta, uint64_t *next_tsc)
{
update_token_times(ctx);
if (l4_meta) {
enum l4gen_peer peer = ctx->stream_cfg->actions[ctx->cur_action].peer;
plogx_dbg("Consuming UDP data\n");
/* data should come from the other side */
if (peer == ctx->peer) {
plogx_err("Wrong peer\n");
return -1;
}
/* Fixed length data expected */
if (ctx->stream_cfg->actions[ctx->cur_action].len != l4_meta->len) {
plogx_dbg("unexpected UDP len (expected = %u, got = %u, action = %u)\n",
ctx->stream_cfg->actions[ctx->cur_action].len,
l4_meta->len,
ctx->cur_action);
return -1;
}
/* With specific payload */
if (memcmp(ctx->stream_cfg->data[peer].content + ctx->stream_cfg->actions[ctx->cur_action].beg, l4_meta->payload, l4_meta->len) != 0) {
plogx_dbg("Bad payload at action_id %d, with peer = %d and pos = %d and len=%d\n", ctx->cur_action, peer, ctx->cur_pos[peer], l4_meta->len);
return -1;
}
ctx->cur_pos[peer] += l4_meta->len;
ctx->cur_action++;
if (stream_udp_is_ended(ctx))
return -1;
token_time_take(&ctx->token_time_other, mbuf_wire_size(mbuf));
/* Time before next packet is expected to
arrive. Note, addition amount of time is accounted
for due to rate limiting. */
uint64_t wait = token_time_tsc_until_full(&ctx->token_time_other);
*next_tsc = wait + ctx->stream_cfg->tsc_timeout;
}
if (ctx->stream_cfg->actions[ctx->cur_action].peer != ctx->peer) {
const char *other_peer_str = ctx->peer != PEER_SERVER? "server" : "client";
plogx_dbg("Expecting more UDP data from %s, will expire = %s\n", other_peer_str, l4_meta == NULL? "yes" : "no");
if (!l4_meta) {
ctx->flags |= STREAM_CTX_F_EXPIRED;
}
return -1;
}
uint64_t wait_tsc = token_time_tsc_until_full(&ctx->token_time);
if (wait_tsc != 0) {
plogx_dbg("Wait = %"PRIu64"\n", wait_tsc);
*next_tsc = wait_tsc;
return -1;
}
const struct stream_cfg *stream_cfg = ctx->stream_cfg;
uint8_t *pkt = rte_pktmbuf_mtod(mbuf, uint8_t *);
const struct peer_action *act = &stream_cfg->actions[ctx->cur_action];
uint16_t pkt_len = stream_cfg->data[act->peer].hdr_len + sizeof(struct udp_hdr) + act->len;
rte_pktmbuf_pkt_len(mbuf) = pkt_len;
rte_pktmbuf_data_len(mbuf) = pkt_len;
plogx_dbg("Creating UDP data (peer = %s, payload len = %u)\n", act->peer == PEER_CLIENT? "client" : "server", act->len);
/* Construct the packet. The template is used up to L4 header,
a gap of sizeof(l4_hdr) is skipped, followed by the payload. */
rte_memcpy(pkt, stream_cfg->data[act->peer].hdr, stream_cfg->data[act->peer].hdr_len);
rte_memcpy(pkt + stream_cfg->data[act->peer].hdr_len + sizeof(struct udp_hdr), stream_cfg->data[act->peer].content + act->beg, act->len);
struct ipv4_hdr *l3_hdr = (struct ipv4_hdr*)&pkt[stream_cfg->data[act->peer].hdr_len - sizeof(struct ipv4_hdr)];
struct udp_hdr *l4_hdr = (struct udp_hdr*)&pkt[stream_cfg->data[act->peer].hdr_len];
l3_hdr->src_addr = ctx->tuple->dst_addr;
l3_hdr->dst_addr = ctx->tuple->src_addr;
l3_hdr->next_proto_id = IPPROTO_UDP;
l4_hdr->src_port = ctx->tuple->dst_port;
l4_hdr->dst_port = ctx->tuple->src_port;
l4_hdr->dgram_len = rte_bswap16(sizeof(struct udp_hdr) + act->len);
/* TODO: UDP checksum calculation */
l3_hdr->total_length = rte_bswap16(sizeof(struct ipv4_hdr) + sizeof(struct udp_hdr) + act->len);
ctx->cur_pos[ctx->peer] += act->len;
ctx->cur_action++;
/* When the stream has ended, there is no need to schedule
another timeout (which will be unscheduled at the end of
the stream). */
if (stream_udp_is_ended(ctx))
return 0;
token_time_take(&ctx->token_time, mbuf_wire_size(mbuf));
/* Send next packet as soon as possible */
if (ctx->stream_cfg->actions[ctx->cur_action].peer == ctx->peer) {
*next_tsc = token_time_tsc_until_full(&ctx->token_time);
}
else {
uint64_t wait = token_time_tsc_until_full(&ctx->token_time_other);
*next_tsc = wait + ctx->stream_cfg->tsc_timeout;
}
return 0;
}
uint16_t stream_udp_reply_len(struct stream_ctx *ctx)
{
if (stream_udp_is_ended(ctx))
return 0;
else if (ctx->stream_cfg->actions[ctx->cur_action].peer == ctx->peer)
return 0;
else
return ctx->stream_cfg->data[ctx->stream_cfg->actions[ctx->cur_action].peer].hdr_len + sizeof(struct udp_hdr) +
ctx->stream_cfg->actions[ctx->cur_action].len;
}
void stream_udp_calc_len(struct stream_cfg *cfg, uint32_t *n_pkts, uint32_t *n_bytes)
{
const uint32_t client_hdr_len = cfg->data[PEER_CLIENT].hdr_len;
const uint32_t server_hdr_len = cfg->data[PEER_SERVER].hdr_len;
*n_pkts = 0;
*n_bytes = 0;
for (uint32_t i = 0; i < cfg->n_actions; ++i) {
const uint32_t send_hdr_len = cfg->actions[i].peer == PEER_CLIENT? client_hdr_len : server_hdr_len;
uint32_t len = send_hdr_len + sizeof(struct udp_hdr) + cfg->actions[i].len;
*n_bytes += (len < 60? 60 : len) + 24;
(*n_pkts)++;
}
}
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