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/*
* Copyright (c) 2016 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.
*/
#ifndef _SYNCOOKIE_H_
#define _SYNCOOKIE_H_
#include <rte_jhash.h>
#include "tcp_misc.h"
#include <tle_ctx.h>
#include <halfsiphash.h>
#ifdef __cplusplus
extern "C" {
#endif
struct sync_in4 {
uint32_t seq;
union l4_ports port;
union ipv4_addrs addr;
};
static const rte_xmm_t mss4len = {
.u32 = {
TCP4_MIN_MSS, /* 536 */
1300,
TCP4_OP_MSS, /* 1440 */
TCP4_NOP_MSS, /* 1460 */
},
};
static const rte_xmm_t mss6len = {
.u32 = {
TCP6_MIN_MSS, /* 1220 */
TCP6_OP_MSS, /* 1420 */
TCP6_NOP_MSS, /* 1440 */
8940,
},
};
#define SYNC_MSS_BITS 2
#define SYNC_MSS_MASK ((1 << SYNC_MSS_BITS) - 1)
#define SYNC_TMS_WSCALE_BITS 4
#define SYNC_TMS_WSCALE_MASK ((1 << SYNC_TMS_WSCALE_BITS) - 1)
#define SYNC_TMS_RESERVE_BITS 2
#define SYNC_TMS_OPT_BITS (SYNC_TMS_WSCALE_BITS + SYNC_TMS_RESERVE_BITS)
#define SYNC_TMS_OPT_MASK ((1 << SYNC_TMS_OPT_BITS) - 1)
/* allow around 2 minutes for 3-way handshake. */
#define SYNC_MAX_TMO 0x20000
/* ??? use SipHash as FreeBSD does. ??? */
static inline uint32_t
sync_hash4(const union pkt_info *pi, uint32_t seq, rte_xmm_t *secret_key,
uint32_t hash_alg)
{
struct sync_in4 in4;
rte_xmm_t state;
uint32_t v0, v1;
in4.seq = seq;
in4.port = pi->port;
in4.addr = pi->addr4;
if (hash_alg == TLE_JHASH) {
v0 = secret_key->u32[0];
v1 = secret_key->u32[1];
rte_jhash_32b_2hashes(&in4.seq, sizeof(in4) / sizeof(uint32_t),
&v0, &v1);
return v0 + v1;
} else {
state = *secret_key;
siphash_compression(&in4.seq, sizeof(in4) / sizeof(uint32_t),
&state);
siphash_finalization(&state);
return (state.u32[0] ^ state.u32[1] ^
state.u32[2] ^ state.u32[3]);
}
}
static inline uint32_t
sync_hash6(const union pkt_info *pi, uint32_t seq, rte_xmm_t *secret_key,
uint32_t hash_alg)
{
uint32_t port_seq[2];
rte_xmm_t state;
uint32_t v0, v1;
if (hash_alg == TLE_JHASH) {
v0 = secret_key->u32[0];
v1 = secret_key->u32[1];
rte_jhash_32b_2hashes(pi->addr6->raw.u32,
sizeof(*pi->addr6) / sizeof(uint32_t),
&v0, &v1);
return rte_jhash_3words(v0, seq, pi->port.raw, v1);
} else {
state = *secret_key;
siphash_compression(pi->addr6->raw.u32,
sizeof(*pi->addr6) / sizeof(uint32_t), &state);
port_seq[0] = pi->port.raw;
port_seq[1] = seq;
siphash_compression(port_seq, RTE_DIM(port_seq), &state);
siphash_finalization(&state);
return (state.u32[0] ^ state.u32[1] ^
state.u32[2] ^ state.u32[3]);
}
}
static inline uint32_t
sync_mss2idx(uint16_t mss, const rte_xmm_t *msl)
{
if (mss >= msl->u32[2])
return (mss >= msl->u32[3]) ? 3 : 2;
else
return (mss >= msl->u32[1]) ? 1 : 0;
}
static inline uint32_t
sync_gen_seq(const union pkt_info *pi, uint32_t seq, uint32_t ts, uint16_t mss,
uint32_t hash_alg, rte_xmm_t *secret_key)
{
uint32_t h, mi;
if (pi->tf.type == TLE_V4) {
h = sync_hash4(pi, seq, secret_key, hash_alg);
mi = sync_mss2idx(mss, &mss4len);
} else {
h = sync_hash6(pi, seq, secret_key, hash_alg);
mi = sync_mss2idx(mss, &mss6len);
}
h += (ts & ~SYNC_MSS_MASK) | mi;
return h;
}
static inline uint32_t
sync_gen_ts(uint32_t ts, uint32_t wscale)
{
ts = (ts - (SYNC_TMS_OPT_MASK + 1)) & ~SYNC_TMS_OPT_MASK;
ts |= wscale;
return ts;
}
static inline int
sync_check_ack(const union pkt_info *pi, uint32_t seq, uint32_t ack,
uint32_t ts, uint32_t hash_alg, rte_xmm_t *secret_key)
{
uint32_t h, mi, pts;
if (pi->tf.type == TLE_V4)
h = sync_hash4(pi, seq, secret_key, hash_alg);
else
h = sync_hash6(pi, seq, secret_key, hash_alg);
h = ack - h;
pts = h & ~SYNC_MSS_MASK;
mi = h & SYNC_MSS_MASK;
if (ts - pts > SYNC_MAX_TMO)
return -ERANGE;
return (pi->tf.type == TLE_V4) ? mss4len.u32[mi] : mss6len.u32[mi];
}
static inline void
sync_get_opts(struct syn_opts *so, uintptr_t p, uint32_t len)
{
so->ts = get_tms_opts(p, len);
so->wscale = so->ts.ecr & SYNC_TMS_WSCALE_MASK;
}
static inline void
sync_fill_tcb(struct tcb *tcb, const union seg_info *si,
const struct syn_opts *so)
{
tcb->rcv.nxt = si->seq;
tcb->rcv.irs = si->seq - 1;
tcb->snd.nxt = si->ack;
tcb->snd.una = si->ack;
tcb->snd.iss = si->ack - 1;
tcb->snd.rcvr = tcb->snd.iss;
tcb->snd.wu.wl1 = si->seq;
tcb->snd.wu.wl2 = si->ack;
tcb->so = *so;
tcb->snd.wscale = tcb->so.wscale;
tcb->snd.mss = tcb->so.mss;
tcb->snd.wnd = si->wnd << tcb->snd.wscale;
tcb->snd.ts = tcb->so.ts.ecr;
tcb->rcv.ts = tcb->so.ts.val;
tcb->rcv.wscale = (tcb->so.wscale == TCP_WSCALE_NONE) ?
TCP_WSCALE_NONE : TCP_WSCALE_DEFAULT;
}
#ifdef __cplusplus
}
#endif
#endif /* _STREAM_TABLE_H_ */
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