#include <sys/param.h>
#include <sys/systm.h>
#include <netinet/in_systm.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <net/route.h>
#include <netinet/in.h>
#include <net/if.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_cache.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_fsm.h>
#include <netinet/mptcp_var.h>
#include <netinet/mptcp.h>
#include <netinet/mptcp_opt.h>
#include <netinet/mptcp_seq.h>
#include <libkern/crypto/sha1.h>
#include <netinet/mptcp_timer.h>
#include <mach/sdt.h>
static int mptcp_validate_join_hmac(struct tcpcb *, u_char*, int);
static int mptcp_snd_mpprio(struct tcpcb *tp, u_char *cp, int optlen);
static void mptcp_send_remaddr_opt(struct tcpcb *, struct mptcp_remaddr_opt *);
static unsigned
mptcp_setup_first_subflow_syn_opts(struct socket *so, u_char *opt, unsigned optlen)
{
struct mptcp_mpcapable_opt_common mptcp_opt;
struct tcpcb *tp = sototcpcb(so);
struct mptcb *mp_tp = tptomptp(tp);
mpte_lock_assert_held(mp_tp->mpt_mpte);
if (tp->t_rxtshift > mptcp_mpcap_retries) {
if (!(mp_tp->mpt_flags & (MPTCPF_FALLBACK_HEURISTIC | MPTCPF_HEURISTIC_TRAC))) {
mp_tp->mpt_flags |= MPTCPF_HEURISTIC_TRAC;
tcp_heuristic_mptcp_loss(tp);
}
return (optlen);
}
if (!tcp_heuristic_do_mptcp(tp)) {
mp_tp->mpt_flags |= MPTCPF_FALLBACK_HEURISTIC;
return (optlen);
}
bzero(&mptcp_opt, sizeof (struct mptcp_mpcapable_opt_common));
mptcp_opt.mmco_kind = TCPOPT_MULTIPATH;
mptcp_opt.mmco_len =
sizeof (struct mptcp_mpcapable_opt_common) +
sizeof (mptcp_key_t);
mptcp_opt.mmco_subtype = MPO_CAPABLE;
mptcp_opt.mmco_version = mp_tp->mpt_version;
mptcp_opt.mmco_flags |= MPCAP_PROPOSAL_SBIT;
if (mp_tp->mpt_flags & MPTCPF_CHECKSUM)
mptcp_opt.mmco_flags |= MPCAP_CHECKSUM_CBIT;
memcpy(opt + optlen, &mptcp_opt, sizeof (struct mptcp_mpcapable_opt_common));
optlen += sizeof (struct mptcp_mpcapable_opt_common);
memcpy(opt + optlen, &mp_tp->mpt_localkey, sizeof (mptcp_key_t));
optlen += sizeof (mptcp_key_t);
return (optlen);
}
static unsigned
mptcp_setup_join_subflow_syn_opts(struct socket *so, u_char *opt, unsigned optlen)
{
struct mptcp_mpjoin_opt_req mpjoin_req;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = NULL;
struct mptsub *mpts;
if (!inp)
return (optlen);
tp = intotcpcb(inp);
if (!tp)
return (optlen);
mpts = tp->t_mpsub;
VERIFY(tptomptp(tp));
mpte_lock_assert_held(tptomptp(tp)->mpt_mpte);
bzero(&mpjoin_req, sizeof (mpjoin_req));
mpjoin_req.mmjo_kind = TCPOPT_MULTIPATH;
mpjoin_req.mmjo_len = sizeof (mpjoin_req);
mpjoin_req.mmjo_subtype_bkp = MPO_JOIN << 4;
if (tp->t_mpflags & TMPF_BACKUP_PATH) {
mpjoin_req.mmjo_subtype_bkp |= MPTCP_BACKUP;
} else if (inp->inp_boundifp && IFNET_IS_CELLULAR(inp->inp_boundifp) &&
mpts->mpts_mpte->mpte_svctype != MPTCP_SVCTYPE_AGGREGATE) {
mpjoin_req.mmjo_subtype_bkp |= MPTCP_BACKUP;
tp->t_mpflags |= TMPF_BACKUP_PATH;
} else {
mpts->mpts_flags |= MPTSF_PREFERRED;
}
mpjoin_req.mmjo_addr_id = tp->t_local_aid;
mpjoin_req.mmjo_peer_token = tptomptp(tp)->mpt_remotetoken;
if (mpjoin_req.mmjo_peer_token == 0) {
mptcplog((LOG_DEBUG, "%s: peer token 0", __func__),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
}
mptcp_get_rands(tp->t_local_aid, tptomptp(tp),
&mpjoin_req.mmjo_rand, NULL);
memcpy(opt + optlen, &mpjoin_req, mpjoin_req.mmjo_len);
optlen += mpjoin_req.mmjo_len;
return (optlen);
}
unsigned
mptcp_setup_join_ack_opts(struct tcpcb *tp, u_char *opt, unsigned optlen)
{
unsigned new_optlen;
struct mptcp_mpjoin_opt_rsp2 join_rsp2;
if ((MAX_TCPOPTLEN - optlen) < sizeof (struct mptcp_mpjoin_opt_rsp2)) {
printf("%s: no space left %d \n", __func__, optlen);
return (optlen);
}
bzero(&join_rsp2, sizeof (struct mptcp_mpjoin_opt_rsp2));
join_rsp2.mmjo_kind = TCPOPT_MULTIPATH;
join_rsp2.mmjo_len = sizeof (struct mptcp_mpjoin_opt_rsp2);
join_rsp2.mmjo_subtype = MPO_JOIN;
mptcp_get_hmac(tp->t_local_aid, tptomptp(tp),
(u_char*)&join_rsp2.mmjo_mac);
memcpy(opt + optlen, &join_rsp2, join_rsp2.mmjo_len);
new_optlen = optlen + join_rsp2.mmjo_len;
return (new_optlen);
}
unsigned
mptcp_setup_syn_opts(struct socket *so, u_char *opt, unsigned optlen)
{
unsigned new_optlen;
if (!(so->so_flags & SOF_MP_SEC_SUBFLOW))
new_optlen = mptcp_setup_first_subflow_syn_opts(so, opt, optlen);
else
new_optlen = mptcp_setup_join_subflow_syn_opts(so, opt, optlen);
return (new_optlen);
}
static int
mptcp_send_mpfail(struct tcpcb *tp, u_char *opt, unsigned int optlen)
{
#pragma unused(tp, opt, optlen)
struct mptcb *mp_tp = NULL;
struct mptcp_mpfail_opt fail_opt;
uint64_t dsn;
int len = sizeof (struct mptcp_mpfail_opt);
mp_tp = tptomptp(tp);
if (mp_tp == NULL) {
tp->t_mpflags &= ~TMPF_SND_MPFAIL;
return (optlen);
}
mpte_lock_assert_held(mp_tp->mpt_mpte);
if ((MAX_TCPOPTLEN - optlen) < sizeof (struct mptcp_mpfail_opt)) {
tp->t_mpflags &= ~TMPF_SND_MPFAIL;
return (optlen);
}
dsn = mp_tp->mpt_rcvnxt;
bzero(&fail_opt, sizeof (fail_opt));
fail_opt.mfail_kind = TCPOPT_MULTIPATH;
fail_opt.mfail_len = len;
fail_opt.mfail_subtype = MPO_FAIL;
fail_opt.mfail_dsn = mptcp_hton64(dsn);
memcpy(opt + optlen, &fail_opt, len);
optlen += len;
tp->t_mpflags &= ~TMPF_SND_MPFAIL;
mptcplog((LOG_DEBUG, "%s: %d \n", __func__,
tp->t_local_aid), (MPTCP_SOCKET_DBG | MPTCP_SENDER_DBG),
MPTCP_LOGLVL_LOG);
return (optlen);
}
static int
mptcp_send_infinite_mapping(struct tcpcb *tp, u_char *opt, unsigned int optlen)
{
struct mptcp_dsn_opt infin_opt;
struct mptcb *mp_tp = NULL;
size_t len = sizeof (struct mptcp_dsn_opt);
struct socket *so = tp->t_inpcb->inp_socket;
int csum_len = 0;
if (!so)
return (optlen);
mp_tp = tptomptp(tp);
if (mp_tp == NULL)
return (optlen);
mpte_lock_assert_held(mp_tp->mpt_mpte);
if (mp_tp->mpt_flags & MPTCPF_CHECKSUM)
csum_len = 2;
if ((MAX_TCPOPTLEN - optlen) < (len + csum_len))
return (optlen);
bzero(&infin_opt, sizeof (infin_opt));
infin_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
infin_opt.mdss_copt.mdss_len = len + csum_len;
infin_opt.mdss_copt.mdss_subtype = MPO_DSS;
infin_opt.mdss_copt.mdss_flags |= MDSS_M;
if (mp_tp->mpt_flags & MPTCPF_RECVD_MPFAIL) {
infin_opt.mdss_dsn = (u_int32_t)
MPTCP_DATASEQ_LOW32(mp_tp->mpt_dsn_at_csum_fail);
infin_opt.mdss_subflow_seqn = mp_tp->mpt_ssn_at_csum_fail;
} else {
if ((tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED) &&
((mp_tp->mpt_local_idsn + 1) == mp_tp->mpt_snduna)) {
infin_opt.mdss_subflow_seqn = 1;
mptcplog((LOG_DEBUG, "%s: idsn %llu snduna %llu \n",
__func__, mp_tp->mpt_local_idsn,
mp_tp->mpt_snduna),
(MPTCP_SOCKET_DBG | MPTCP_SENDER_DBG),
MPTCP_LOGLVL_LOG);
} else {
infin_opt.mdss_subflow_seqn = tp->snd_una - tp->t_mpsub->mpts_iss;
}
infin_opt.mdss_dsn = (u_int32_t)
MPTCP_DATASEQ_LOW32(mp_tp->mpt_snduna);
}
if ((infin_opt.mdss_dsn == 0) || (infin_opt.mdss_subflow_seqn == 0)) {
return (optlen);
}
infin_opt.mdss_dsn = htonl(infin_opt.mdss_dsn);
infin_opt.mdss_subflow_seqn = htonl(infin_opt.mdss_subflow_seqn);
infin_opt.mdss_data_len = 0;
memcpy(opt + optlen, &infin_opt, len);
optlen += len;
if (csum_len != 0) {
uint16_t csum = 0;
memcpy(opt + optlen, &csum, csum_len);
optlen += csum_len;
}
mptcplog((LOG_DEBUG, "%s: dsn = %x, seq = %x len = %x\n", __func__,
ntohl(infin_opt.mdss_dsn),
ntohl(infin_opt.mdss_subflow_seqn),
ntohs(infin_opt.mdss_data_len)),
(MPTCP_SOCKET_DBG | MPTCP_SENDER_DBG),
MPTCP_LOGLVL_LOG);
tp->t_mpflags |= TMPF_INFIN_SENT;
tcpstat.tcps_estab_fallback++;
return (optlen);
}
static int
mptcp_ok_to_fin(struct tcpcb *tp, u_int64_t dsn, u_int32_t datalen)
{
struct mptcb *mp_tp = tptomptp(tp);
mpte_lock_assert_held(mp_tp->mpt_mpte);
dsn = (mp_tp->mpt_sndmax & MPTCP_DATASEQ_LOW32_MASK) | dsn;
if ((dsn + datalen) == mp_tp->mpt_sndmax)
return (1);
return (0);
}
unsigned int
mptcp_setup_opts(struct tcpcb *tp, int32_t off, u_char *opt,
unsigned int optlen, int flags, int len,
boolean_t *p_mptcp_acknow)
{
struct inpcb *inp = (struct inpcb *)tp->t_inpcb;
struct socket *so = inp->inp_socket;
struct mptcb *mp_tp = tptomptp(tp);
boolean_t do_csum = FALSE;
boolean_t send_64bit_dsn = FALSE;
boolean_t send_64bit_ack = FALSE;
u_int32_t old_mpt_flags = tp->t_mpflags & TMPF_MPTCP_SIGNALS;
if (mptcp_enable == 0 || mp_tp == NULL || tp->t_state == TCPS_CLOSED) {
goto ret_optlen;
}
mpte_lock_assert_held(mp_tp->mpt_mpte);
if (mp_tp->mpt_flags & MPTCPF_CHECKSUM) {
do_csum = TRUE;
}
if (flags & TH_SYN) {
goto ret_optlen;
}
if ((MAX_TCPOPTLEN - optlen) <
sizeof (struct mptcp_mpcapable_opt_common)) {
mptcplog((LOG_ERR, "%s: no space left %d flags %x tp->t_mpflags %x len %d\n",
__func__, optlen, flags, tp->t_mpflags, len),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
goto ret_optlen;
}
if (tp->t_mpflags & TMPF_TCP_FALLBACK) {
if (tp->t_mpflags & TMPF_SND_MPFAIL)
optlen = mptcp_send_mpfail(tp, opt, optlen);
else if (!(tp->t_mpflags & TMPF_INFIN_SENT))
optlen = mptcp_send_infinite_mapping(tp, opt, optlen);
goto ret_optlen;
}
if (tp->t_mpflags & TMPF_SND_KEYS) {
struct mptcp_mpcapable_opt_rsp1 mptcp_opt;
if ((MAX_TCPOPTLEN - optlen) <
sizeof (struct mptcp_mpcapable_opt_rsp1))
goto ret_optlen;
bzero(&mptcp_opt, sizeof (struct mptcp_mpcapable_opt_rsp1));
mptcp_opt.mmc_common.mmco_kind = TCPOPT_MULTIPATH;
mptcp_opt.mmc_common.mmco_len =
sizeof (struct mptcp_mpcapable_opt_rsp1);
mptcp_opt.mmc_common.mmco_subtype = MPO_CAPABLE;
mptcp_opt.mmc_common.mmco_version = mp_tp->mpt_version;
mptcp_opt.mmc_common.mmco_flags |= MPCAP_PROPOSAL_SBIT;
if (mp_tp->mpt_flags & MPTCPF_CHECKSUM)
mptcp_opt.mmc_common.mmco_flags |= MPCAP_CHECKSUM_CBIT;
mptcp_opt.mmc_localkey = mp_tp->mpt_localkey;
mptcp_opt.mmc_remotekey = mp_tp->mpt_remotekey;
memcpy(opt + optlen, &mptcp_opt, mptcp_opt.mmc_common.mmco_len);
optlen += mptcp_opt.mmc_common.mmco_len;
tp->t_mpflags &= ~TMPF_SND_KEYS;
if (!tp->t_mpuna) {
tp->t_mpuna = tp->snd_una;
} else {
}
goto ret_optlen;
}
if (tp->t_mpflags & TMPF_SND_JACK) {
optlen = mptcp_setup_join_ack_opts(tp, opt, optlen);
if (!tp->t_mpuna) {
tp->t_mpuna = tp->snd_una;
}
tp->t_timer[TCPT_JACK_RXMT] =
OFFSET_FROM_START(tp, tcp_jack_rxmt);
tp->t_mpflags &= ~TMPF_SND_JACK;
goto ret_optlen;
}
if (!(tp->t_mpflags & TMPF_MPTCP_TRUE))
goto ret_optlen;
if ((tp->t_mpflags & TMPF_MPTCP_TRUE) &&
(tp->t_mpflags & TMPF_SND_REM_ADDR)) {
int rem_opt_len = sizeof (struct mptcp_remaddr_opt);
if ((optlen + rem_opt_len) <= MAX_TCPOPTLEN) {
mptcp_send_remaddr_opt(tp,
(struct mptcp_remaddr_opt *)(opt + optlen));
optlen += rem_opt_len;
} else {
tp->t_mpflags &= ~TMPF_SND_REM_ADDR;
}
}
if (tp->t_mpflags & TMPF_SND_MPPRIO) {
optlen = mptcp_snd_mpprio(tp, opt, optlen);
}
if (mp_tp->mpt_flags & MPTCPF_SND_64BITDSN) {
send_64bit_dsn = TRUE;
}
if (mp_tp->mpt_flags & MPTCPF_SND_64BITACK)
send_64bit_ack = TRUE;
#define CHECK_OPTLEN { \
if ((MAX_TCPOPTLEN - optlen) < dssoptlen) { \
mptcplog((LOG_ERR, "%s: dssoptlen %d optlen %d \n", __func__, \
dssoptlen, optlen), \
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR); \
goto ret_optlen; \
} \
}
#define DO_FIN(dsn_opt) { \
int sndfin = 0; \
sndfin = mptcp_ok_to_fin(tp, dsn_opt.mdss_dsn, len); \
if (sndfin) { \
dsn_opt.mdss_copt.mdss_flags |= MDSS_F; \
dsn_opt.mdss_data_len += 1; \
} \
}
#define CHECK_DATALEN { \
\
if ((len + optlen + dssoptlen) > tp->t_maxopd) { \
mptcplog((LOG_ERR, "%s: nosp %d len %d opt %d %d %d\n", \
__func__, len, dssoptlen, optlen, \
tp->t_maxseg, tp->t_maxopd), \
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR); \
\
len = tp->t_maxopd - optlen - dssoptlen; \
} \
}
if ((tp->t_mpflags & TMPF_SEND_DSN) &&
(send_64bit_dsn)) {
struct mptcp_dss64_ack32_opt dsn_ack_opt;
unsigned int dssoptlen = sizeof (dsn_ack_opt);
uint16_t dss_csum;
if (do_csum) {
dssoptlen += 2;
}
CHECK_OPTLEN;
bzero(&dsn_ack_opt, sizeof (dsn_ack_opt));
dsn_ack_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dsn_ack_opt.mdss_copt.mdss_subtype = MPO_DSS;
dsn_ack_opt.mdss_copt.mdss_len = dssoptlen;
dsn_ack_opt.mdss_copt.mdss_flags |=
MDSS_M | MDSS_m | MDSS_A;
CHECK_DATALEN;
mptcp_output_getm_dsnmap64(so, off,
&dsn_ack_opt.mdss_dsn,
&dsn_ack_opt.mdss_subflow_seqn,
&dsn_ack_opt.mdss_data_len,
&dss_csum);
if ((dsn_ack_opt.mdss_data_len == 0) ||
(dsn_ack_opt.mdss_dsn == 0)) {
goto ret_optlen;
}
if (tp->t_mpflags & TMPF_SEND_DFIN) {
DO_FIN(dsn_ack_opt);
}
dsn_ack_opt.mdss_ack =
htonl(MPTCP_DATAACK_LOW32(mp_tp->mpt_rcvnxt));
dsn_ack_opt.mdss_dsn = mptcp_hton64(dsn_ack_opt.mdss_dsn);
dsn_ack_opt.mdss_subflow_seqn = htonl(
dsn_ack_opt.mdss_subflow_seqn);
dsn_ack_opt.mdss_data_len = htons(
dsn_ack_opt.mdss_data_len);
memcpy(opt + optlen, &dsn_ack_opt, sizeof (dsn_ack_opt));
if (do_csum)
*((uint16_t *)(void *)(opt + optlen + sizeof (dsn_ack_opt))) = dss_csum;
optlen += dssoptlen;
mptcplog((LOG_DEBUG,"%s: long DSS = %llx ACK = %llx \n", __func__,
mptcp_ntoh64(dsn_ack_opt.mdss_dsn),
mptcp_ntoh64(dsn_ack_opt.mdss_ack)),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_LOG);
tp->t_mpflags &= ~TMPF_MPTCP_ACKNOW;
goto ret_optlen;
}
if ((tp->t_mpflags & TMPF_SEND_DSN) &&
(!send_64bit_dsn) &&
!(tp->t_mpflags & TMPF_MPTCP_ACKNOW)) {
struct mptcp_dsn_opt dsn_opt;
unsigned int dssoptlen = sizeof (struct mptcp_dsn_opt);
uint16_t dss_csum;
if (do_csum) {
dssoptlen += 2;
}
CHECK_OPTLEN;
bzero(&dsn_opt, sizeof (dsn_opt));
dsn_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dsn_opt.mdss_copt.mdss_subtype = MPO_DSS;
dsn_opt.mdss_copt.mdss_len = dssoptlen;
dsn_opt.mdss_copt.mdss_flags |= MDSS_M;
CHECK_DATALEN;
mptcp_output_getm_dsnmap32(so, off, &dsn_opt.mdss_dsn,
&dsn_opt.mdss_subflow_seqn,
&dsn_opt.mdss_data_len,
&dss_csum);
if ((dsn_opt.mdss_data_len == 0) ||
(dsn_opt.mdss_dsn == 0)) {
goto ret_optlen;
}
if (tp->t_mpflags & TMPF_SEND_DFIN) {
DO_FIN(dsn_opt);
}
dsn_opt.mdss_dsn = htonl(dsn_opt.mdss_dsn);
dsn_opt.mdss_subflow_seqn = htonl(dsn_opt.mdss_subflow_seqn);
dsn_opt.mdss_data_len = htons(dsn_opt.mdss_data_len);
memcpy(opt + optlen, &dsn_opt, sizeof (dsn_opt));
if (do_csum)
*((uint16_t *)(void *)(opt + optlen + sizeof (dsn_opt))) = dss_csum;
optlen += dssoptlen;
tp->t_mpflags &= ~TMPF_MPTCP_ACKNOW;
goto ret_optlen;
}
if ((tp->t_mpflags & TMPF_MPTCP_ACKNOW) &&
(!send_64bit_ack) &&
!(tp->t_mpflags & TMPF_SEND_DSN) &&
!(tp->t_mpflags & TMPF_SEND_DFIN)) {
struct mptcp_data_ack_opt dack_opt;
unsigned int dssoptlen = 0;
do_ack32_only:
dssoptlen = sizeof (dack_opt);
CHECK_OPTLEN;
bzero(&dack_opt, dssoptlen);
dack_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dack_opt.mdss_copt.mdss_len = dssoptlen;
dack_opt.mdss_copt.mdss_subtype = MPO_DSS;
dack_opt.mdss_copt.mdss_flags |= MDSS_A;
dack_opt.mdss_ack =
htonl(MPTCP_DATAACK_LOW32(mp_tp->mpt_rcvnxt));
memcpy(opt + optlen, &dack_opt, dssoptlen);
optlen += dssoptlen;
VERIFY(optlen <= MAX_TCPOPTLEN);
tp->t_mpflags &= ~TMPF_MPTCP_ACKNOW;
goto ret_optlen;
}
if ((tp->t_mpflags & TMPF_MPTCP_ACKNOW) &&
(send_64bit_ack) &&
!(tp->t_mpflags & TMPF_SEND_DSN) &&
!(tp->t_mpflags & TMPF_SEND_DFIN)) {
struct mptcp_data_ack64_opt dack_opt;
unsigned int dssoptlen = 0;
do_ack64_only:
dssoptlen = sizeof (dack_opt);
CHECK_OPTLEN;
bzero(&dack_opt, dssoptlen);
dack_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dack_opt.mdss_copt.mdss_len = dssoptlen;
dack_opt.mdss_copt.mdss_subtype = MPO_DSS;
dack_opt.mdss_copt.mdss_flags |= (MDSS_A | MDSS_a);
dack_opt.mdss_ack = mptcp_hton64(mp_tp->mpt_rcvnxt);
mp_tp->mpt_flags &= ~MPTCPF_SND_64BITACK;
memcpy(opt + optlen, &dack_opt, dssoptlen);
optlen += dssoptlen;
VERIFY(optlen <= MAX_TCPOPTLEN);
tp->t_mpflags &= ~TMPF_MPTCP_ACKNOW;
goto ret_optlen;
}
if ((tp->t_mpflags & TMPF_SEND_DSN) &&
(!send_64bit_dsn) &&
(!send_64bit_ack) &&
(tp->t_mpflags & TMPF_MPTCP_ACKNOW)) {
struct mptcp_dss_ack_opt dss_ack_opt;
unsigned int dssoptlen = sizeof (dss_ack_opt);
uint16_t dss_csum;
if (do_csum)
dssoptlen += 2;
CHECK_OPTLEN;
bzero(&dss_ack_opt, sizeof (dss_ack_opt));
dss_ack_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dss_ack_opt.mdss_copt.mdss_len = dssoptlen;
dss_ack_opt.mdss_copt.mdss_subtype = MPO_DSS;
dss_ack_opt.mdss_copt.mdss_flags |= MDSS_A | MDSS_M;
dss_ack_opt.mdss_ack =
htonl(MPTCP_DATAACK_LOW32(mp_tp->mpt_rcvnxt));
CHECK_DATALEN;
mptcp_output_getm_dsnmap32(so, off, &dss_ack_opt.mdss_dsn,
&dss_ack_opt.mdss_subflow_seqn,
&dss_ack_opt.mdss_data_len,
&dss_csum);
if ((dss_ack_opt.mdss_data_len == 0) ||
(dss_ack_opt.mdss_dsn == 0)) {
goto do_ack32_only;
}
if (tp->t_mpflags & TMPF_SEND_DFIN) {
DO_FIN(dss_ack_opt);
}
dss_ack_opt.mdss_dsn = htonl(dss_ack_opt.mdss_dsn);
dss_ack_opt.mdss_subflow_seqn =
htonl(dss_ack_opt.mdss_subflow_seqn);
dss_ack_opt.mdss_data_len = htons(dss_ack_opt.mdss_data_len);
memcpy(opt + optlen, &dss_ack_opt, sizeof (dss_ack_opt));
if (do_csum)
*((uint16_t *)(void *)(opt + optlen + sizeof (dss_ack_opt))) = dss_csum;
optlen += dssoptlen;
if (optlen > MAX_TCPOPTLEN)
panic("optlen too large");
tp->t_mpflags &= ~TMPF_MPTCP_ACKNOW;
goto ret_optlen;
}
if ((tp->t_mpflags & TMPF_SEND_DSN) &&
(!send_64bit_dsn) &&
(send_64bit_ack) &&
(tp->t_mpflags & TMPF_MPTCP_ACKNOW)) {
struct mptcp_dss32_ack64_opt dss_ack_opt;
unsigned int dssoptlen = sizeof (dss_ack_opt);
uint16_t dss_csum;
if (do_csum)
dssoptlen += 2;
CHECK_OPTLEN;
bzero(&dss_ack_opt, sizeof (dss_ack_opt));
dss_ack_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dss_ack_opt.mdss_copt.mdss_len = dssoptlen;
dss_ack_opt.mdss_copt.mdss_subtype = MPO_DSS;
dss_ack_opt.mdss_copt.mdss_flags |= MDSS_M | MDSS_A | MDSS_a;
dss_ack_opt.mdss_ack =
mptcp_hton64(mp_tp->mpt_rcvnxt);
CHECK_DATALEN;
mptcp_output_getm_dsnmap32(so, off, &dss_ack_opt.mdss_dsn,
&dss_ack_opt.mdss_subflow_seqn,
&dss_ack_opt.mdss_data_len,
&dss_csum);
if ((dss_ack_opt.mdss_data_len == 0) ||
(dss_ack_opt.mdss_dsn == 0)) {
goto do_ack64_only;
}
if (tp->t_mpflags & TMPF_SEND_DFIN) {
DO_FIN(dss_ack_opt);
}
dss_ack_opt.mdss_dsn = htonl(dss_ack_opt.mdss_dsn);
dss_ack_opt.mdss_subflow_seqn =
htonl(dss_ack_opt.mdss_subflow_seqn);
dss_ack_opt.mdss_data_len = htons(dss_ack_opt.mdss_data_len);
memcpy(opt + optlen, &dss_ack_opt, sizeof (dss_ack_opt));
if (do_csum)
*((uint16_t *)(void *)(opt + optlen + sizeof (dss_ack_opt))) = dss_csum;
optlen += dssoptlen;
if (optlen > MAX_TCPOPTLEN)
panic("optlen too large");
tp->t_mpflags &= ~TMPF_MPTCP_ACKNOW;
goto ret_optlen;
}
if (tp->t_mpflags & TMPF_SEND_DFIN) {
struct mptcp_dss_ack_opt dss_ack_opt;
unsigned int dssoptlen = sizeof (struct mptcp_dss_ack_opt);
if (do_csum)
dssoptlen += 2;
CHECK_OPTLEN;
bzero(&dss_ack_opt, sizeof (dss_ack_opt));
if (((mp_tp->mpt_sndnxt + 1) != mp_tp->mpt_sndmax) ||
(mp_tp->mpt_snduna == mp_tp->mpt_sndmax))
goto ret_optlen;
dss_ack_opt.mdss_copt.mdss_kind = TCPOPT_MULTIPATH;
dss_ack_opt.mdss_copt.mdss_len = dssoptlen;
dss_ack_opt.mdss_copt.mdss_subtype = MPO_DSS;
dss_ack_opt.mdss_copt.mdss_flags |= MDSS_A | MDSS_M | MDSS_F;
dss_ack_opt.mdss_ack =
htonl(MPTCP_DATAACK_LOW32(mp_tp->mpt_rcvnxt));
dss_ack_opt.mdss_dsn =
htonl(MPTCP_DATASEQ_LOW32(mp_tp->mpt_sndnxt));
dss_ack_opt.mdss_subflow_seqn = 0;
dss_ack_opt.mdss_data_len = 1;
dss_ack_opt.mdss_data_len = htons(dss_ack_opt.mdss_data_len);
memcpy(opt + optlen, &dss_ack_opt, sizeof (dss_ack_opt));
optlen += dssoptlen;
}
ret_optlen:
if (TRUE == *p_mptcp_acknow ) {
VERIFY(old_mpt_flags != 0);
u_int32_t new_mpt_flags = tp->t_mpflags & TMPF_MPTCP_SIGNALS;
if (old_mpt_flags == new_mpt_flags) {
tp->t_mpflags &= ~TMPF_MPTCP_SIGNALS;
*p_mptcp_acknow = FALSE;
mptcplog((LOG_DEBUG, "%s: no action \n", __func__),
MPTCP_SENDER_DBG, MPTCP_LOGLVL_LOG);
} else {
mptcplog((LOG_DEBUG, "%s: acknow set, old flags %x new flags %x \n",
__func__, old_mpt_flags, new_mpt_flags),
MPTCP_SENDER_DBG, MPTCP_LOGLVL_LOG);
}
}
return optlen;
}
static int
mptcp_sanitize_option(struct tcpcb *tp, int mptcp_subtype)
{
struct mptcb *mp_tp = tptomptp(tp);
int ret = 1;
if (mp_tp == NULL) {
mptcplog((LOG_ERR, "%s: NULL mpsocket \n", __func__),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
return (0);
}
switch (mptcp_subtype) {
case MPO_CAPABLE:
break;
case MPO_JOIN:
case MPO_DSS:
case MPO_FASTCLOSE:
case MPO_FAIL:
case MPO_REMOVE_ADDR:
case MPO_ADD_ADDR:
case MPO_PRIO:
if (mp_tp->mpt_state < MPTCPS_ESTABLISHED)
ret = 0;
break;
default:
ret = 0;
mptcplog((LOG_ERR, "%s: type = %d \n", __func__,
mptcp_subtype),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
break;
}
return (ret);
}
static int
mptcp_valid_mpcapable_common_opt(u_char *cp)
{
struct mptcp_mpcapable_opt_common *rsp =
(struct mptcp_mpcapable_opt_common *)cp;
if (!(rsp->mmco_flags & MPCAP_PROPOSAL_SBIT))
return (0);
if (rsp->mmco_flags & (MPCAP_BBIT | MPCAP_CBIT | MPCAP_DBIT |
MPCAP_EBIT | MPCAP_FBIT | MPCAP_GBIT))
return (0);
return (1);
}
static void
mptcp_do_mpcapable_opt(struct tcpcb *tp, u_char *cp, struct tcphdr *th,
int optlen)
{
struct mptcp_mpcapable_opt_rsp *rsp = NULL;
struct mptcb *mp_tp = tptomptp(tp);
mpte_lock_assert_held(mp_tp->mpt_mpte);
if ((th->th_flags & (TH_SYN | TH_ACK)) != (TH_SYN | TH_ACK))
return;
if (mptcp_valid_mpcapable_common_opt(cp) != 1) {
tcpstat.tcps_invalid_mpcap++;
return;
}
if (mp_tp->mpt_state >= MPTCPS_ESTABLISHED)
return;
if (optlen != sizeof (struct mptcp_mpcapable_opt_rsp)) {
mptcplog((LOG_ERR, "%s: SYN_ACK optlen = %d, sizeof mp opt = %lu \n",
__func__, optlen,
sizeof (struct mptcp_mpcapable_opt_rsp)),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
tcpstat.tcps_invalid_mpcap++;
return;
}
if (((struct mptcp_mpcapable_opt_common *)cp)->mmco_flags &
MPCAP_CHECKSUM_CBIT)
mp_tp->mpt_flags |= MPTCPF_CHECKSUM;
rsp = (struct mptcp_mpcapable_opt_rsp *)cp;
mp_tp->mpt_remotekey = rsp->mmc_localkey;
mp_tp->mpt_peer_version = rsp->mmc_common.mmco_version;
if (rsp->mmc_common.mmco_version < mp_tp->mpt_version) {
mp_tp->mpt_version = rsp->mmc_common.mmco_version;
tcpstat.tcps_mp_verdowngrade++;
}
if (mptcp_init_remote_parms(mp_tp) != 0) {
tcpstat.tcps_invalid_mpcap++;
return;
}
tcp_heuristic_mptcp_success(tp);
tp->t_mpflags |= (TMPF_SND_KEYS | TMPF_MPTCP_TRUE);
tp->t_inpcb->inp_socket->so_flags |= SOF_MPTCP_TRUE;
}
static void
mptcp_do_mpjoin_opt(struct tcpcb *tp, u_char *cp, struct tcphdr *th, int optlen)
{
#define MPTCP_JOPT_ERROR_PATH(tp) { \
tp->t_mpflags |= TMPF_RESET; \
tcpstat.tcps_invalid_joins++; \
if (tp->t_inpcb->inp_socket != NULL) { \
soevent(tp->t_inpcb->inp_socket, \
SO_FILT_HINT_LOCKED | SO_FILT_HINT_MUSTRST); \
} \
}
int error = 0;
struct mptcp_mpjoin_opt_rsp *join_rsp =
(struct mptcp_mpjoin_opt_rsp *)cp;
if ((th->th_flags & (TH_SYN | TH_ACK)) != (TH_SYN | TH_ACK))
return;
if (optlen != sizeof (struct mptcp_mpjoin_opt_rsp)) {
mptcplog((LOG_ERR, "%s: SYN_ACK: unexpected optlen = %d mp "
"option = %lu\n", __func__, optlen,
sizeof (struct mptcp_mpjoin_opt_rsp)),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
tp->t_mpflags &= ~TMPF_PREESTABLISHED;
MPTCP_JOPT_ERROR_PATH(tp);
return;
}
mptcp_set_raddr_rand(tp->t_local_aid, tptomptp(tp),
join_rsp->mmjo_addr_id, join_rsp->mmjo_rand);
error = mptcp_validate_join_hmac(tp,
(u_char*)&join_rsp->mmjo_mac, SHA1_TRUNCATED);
if (error) {
mptcplog((LOG_ERR, "%s: SYN_ACK error = %d \n", __func__, error),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_ERR);
tp->t_mpflags &= ~TMPF_PREESTABLISHED;
MPTCP_JOPT_ERROR_PATH(tp);
return;
}
tp->t_mpflags |= (TMPF_SENT_JOIN | TMPF_SND_JACK);
}
static int
mptcp_validate_join_hmac(struct tcpcb *tp, u_char* hmac, int mac_len)
{
u_char digest[SHA1_RESULTLEN] = {0};
struct mptcb *mp_tp = tptomptp(tp);
u_int32_t rem_rand, loc_rand;
mpte_lock_assert_held(mp_tp->mpt_mpte);
rem_rand = loc_rand = 0;
mptcp_get_rands(tp->t_local_aid, mp_tp, &loc_rand, &rem_rand);
if ((rem_rand == 0) || (loc_rand == 0))
return (-1);
mptcp_hmac_sha1(mp_tp->mpt_remotekey, mp_tp->mpt_localkey, rem_rand, loc_rand,
digest);
if (bcmp(digest, hmac, mac_len) == 0)
return (0);
else {
printf("%s: remote key %llx local key %llx remote rand %x "
"local rand %x \n", __func__, mp_tp->mpt_remotekey, mp_tp->mpt_localkey,
rem_rand, loc_rand);
return (-1);
}
}
void
mptcp_data_ack_rcvd(struct mptcb *mp_tp, struct tcpcb *tp, u_int64_t full_dack)
{
u_int64_t acked = 0;
acked = full_dack - mp_tp->mpt_snduna;
if (acked) {
struct socket *mp_so = mptetoso(mp_tp->mpt_mpte);
if (acked > mp_so->so_snd.sb_cc) {
if (acked > mp_so->so_snd.sb_cc + 1 ||
mp_tp->mpt_state < MPTCPS_FIN_WAIT_1)
mptcplog((LOG_ERR, "%s: acked %u, sb_cc %u full %u suna %u state %u\n",
__func__, (uint32_t)acked, mp_so->so_snd.sb_cc,
(uint32_t)full_dack, (uint32_t)mp_tp->mpt_snduna,
mp_tp->mpt_state),
MPTCP_RECEIVER_DBG, MPTCP_LOGLVL_ERR);
sbdrop(&mp_so->so_snd, (int)mp_so->so_snd.sb_cc);
} else {
sbdrop(&mp_so->so_snd, acked);
}
mp_tp->mpt_snduna += acked;
if ((tp->t_mpflags & TMPF_TCP_FALLBACK) &&
!(mp_tp->mpt_flags & MPTCPF_POST_FALLBACK_SYNC) &&
MPTCP_SEQ_GT(mp_tp->mpt_sndnxt, mp_tp->mpt_snduna)) {
mp_tp->mpt_sndnxt = mp_tp->mpt_dsn_at_csum_fail;
mp_tp->mpt_flags |= MPTCPF_POST_FALLBACK_SYNC;
tp->t_inpcb->inp_socket->so_flags1 |=
SOF1_POST_FALLBACK_SYNC;
}
mptcp_clean_reinjectq(mp_tp->mpt_mpte);
sowwakeup(mp_so);
}
if (full_dack == mp_tp->mpt_sndmax &&
mp_tp->mpt_state >= MPTCPS_FIN_WAIT_1) {
mptcp_close_fsm(mp_tp, MPCE_RECV_DATA_ACK);
tp->t_mpflags &= ~TMPF_SEND_DFIN;
}
}
void
mptcp_update_window_fallback(struct tcpcb *tp)
{
struct mptcb *mp_tp = tptomptp(tp);
mpte_lock_assert_held(mp_tp->mpt_mpte);
if (!(mp_tp->mpt_flags & MPTCPF_FALLBACK_TO_TCP))
return;
mptcplog((LOG_DEBUG, "%s: update window to %u\n", __func__, tp->snd_wnd),
MPTCP_SOCKET_DBG, MPTCP_LOGLVL_VERBOSE);
mp_tp->mpt_sndwnd = tp->snd_wnd;
mp_tp->mpt_sndwl1 = mp_tp->mpt_rcvnxt;
mp_tp->mpt_sndwl2 = mp_tp->mpt_snduna;
sowwakeup(tp->t_inpcb->inp_socket);
}
static void
mptcp_update_window(struct mptcb *mp_tp, u_int64_t ack, u_int64_t seq,
u_int32_t tiwin)
{
if ((SEQ_LT(mp_tp->mpt_sndwl1, seq) ||
(mp_tp->mpt_sndwl1 == seq && (SEQ_LT(mp_tp->mpt_sndwl2, ack) ||
(mp_tp->mpt_sndwl2 == ack && tiwin > mp_tp->mpt_sndwnd))))) {
mp_tp->mpt_sndwnd = tiwin;
mp_tp->mpt_sndwl1 = seq;
mp_tp->mpt_sndwl2 = ack;
mptcplog((LOG_DEBUG, "%s: Updating window to %u\n", __func__,
mp_tp->mpt_sndwnd), MPTCP_RECEIVER_DBG, MPTCP_LOGLVL_VERBOSE);
}
}
static void
mptcp_do_dss_opt_ack_meat(u_int64_t full_dack, u_int64_t full_dsn,
struct tcpcb *tp, u_int32_t tiwin)
{
struct mptcb *mp_tp = tptomptp(tp);
int close_notify = 0;
tp->t_mpflags |= TMPF_RCVD_DACK;
if (MPTCP_SEQ_LEQ(full_dack, mp_tp->mpt_sndmax) &&
MPTCP_SEQ_GEQ(full_dack, mp_tp->mpt_snduna)) {
mptcp_data_ack_rcvd(mp_tp, tp, full_dack);
if (mp_tp->mpt_state > MPTCPS_FIN_WAIT_2)
close_notify = 1;
if (mp_tp->mpt_flags & MPTCPF_RCVD_64BITACK) {
mp_tp->mpt_flags &= ~MPTCPF_RCVD_64BITACK;
mp_tp->mpt_flags &= ~MPTCPF_SND_64BITDSN;
}
mptcp_notify_mpready(tp->t_inpcb->inp_socket);
if (close_notify)
mptcp_notify_close(tp->t_inpcb->inp_socket);
} else {
mptcplog((LOG_ERR,"%s: unexpected dack %u snduna %u sndmax %u\n", __func__,
(u_int32_t)full_dack, (u_int32_t)mp_tp->mpt_snduna,
(u_int32_t)mp_tp->mpt_sndmax),
(MPTCP_SOCKET_DBG|MPTCP_RECEIVER_DBG),
MPTCP_LOGLVL_LOG);
}
mptcp_update_window(mp_tp, full_dack, full_dsn, tiwin);
}
static void
mptcp_do_dss_opt_meat(u_char *cp, struct tcpcb *tp, struct tcphdr *th)
{
struct mptcp_dss_copt *dss_rsp = (struct mptcp_dss_copt *)cp;
u_int64_t full_dack = 0;
u_int32_t tiwin = th->th_win << tp->snd_scale;
struct mptcb *mp_tp = tptomptp(tp);
int csum_len = 0;
#define MPTCP_DSS_OPT_SZ_CHK(len, expected_len) { \
if (len != expected_len) { \
mptcplog((LOG_ERR, "%s: bad len = %d dss: %x \n", __func__, \
len, dss_rsp->mdss_flags), \
(MPTCP_SOCKET_DBG|MPTCP_RECEIVER_DBG), \
MPTCP_LOGLVL_LOG); \
return; \
} \
}
if (mp_tp->mpt_flags & MPTCPF_CHECKSUM)
csum_len = 2;
dss_rsp->mdss_flags &= (MDSS_A|MDSS_a|MDSS_M|MDSS_m);
switch (dss_rsp->mdss_flags) {
case (MDSS_M):
{
struct mptcp_dsn_opt *dss_rsp1;
dss_rsp1 = (struct mptcp_dsn_opt *)cp;
MPTCP_DSS_OPT_SZ_CHK(dss_rsp1->mdss_copt.mdss_len,
sizeof (struct mptcp_dsn_opt) + csum_len);
if (csum_len == 0)
mptcp_update_dss_rcv_state(dss_rsp1, tp, 0);
else
mptcp_update_dss_rcv_state(dss_rsp1, tp,
*(uint16_t *)(void *)(cp +
(dss_rsp1->mdss_copt.mdss_len - csum_len)));
break;
}
case (MDSS_A):
{
struct mptcp_data_ack_opt *dack_opt;
dack_opt = (struct mptcp_data_ack_opt *)cp;
MPTCP_DSS_OPT_SZ_CHK(dack_opt->mdss_copt.mdss_len,
sizeof (struct mptcp_data_ack_opt));
u_int32_t dack = dack_opt->mdss_ack;
NTOHL(dack);
MPTCP_EXTEND_DSN(mp_tp->mpt_snduna, dack, full_dack);
mptcp_do_dss_opt_ack_meat(full_dack, mp_tp->mpt_sndwl1, tp, tiwin);
break;
}
case (MDSS_M | MDSS_A):
{
struct mptcp_dss_ack_opt *dss_ack_rsp;
dss_ack_rsp = (struct mptcp_dss_ack_opt *)cp;
u_int64_t full_dsn;
uint16_t csum = 0;
MPTCP_DSS_OPT_SZ_CHK(dss_ack_rsp->mdss_copt.mdss_len,
sizeof (struct mptcp_dss_ack_opt) + csum_len);
u_int32_t dack = dss_ack_rsp->mdss_ack;
NTOHL(dack);
MPTCP_EXTEND_DSN(mp_tp->mpt_snduna, dack, full_dack);
NTOHL(dss_ack_rsp->mdss_dsn);
NTOHL(dss_ack_rsp->mdss_subflow_seqn);
NTOHS(dss_ack_rsp->mdss_data_len);
MPTCP_EXTEND_DSN(mp_tp->mpt_rcvnxt, dss_ack_rsp->mdss_dsn, full_dsn);
mptcp_do_dss_opt_ack_meat(full_dack, full_dsn, tp, tiwin);
if (csum_len != 0)
csum = *(uint16_t *)(void *)(cp + (dss_ack_rsp->mdss_copt.mdss_len - csum_len));
mptcp_update_rcv_state_meat(mp_tp, tp,
full_dsn,
dss_ack_rsp->mdss_subflow_seqn,
dss_ack_rsp->mdss_data_len,
csum);
break;
}
case (MDSS_M | MDSS_m):
{
struct mptcp_dsn64_opt *dsn64;
dsn64 = (struct mptcp_dsn64_opt *)cp;
u_int64_t full_dsn;
uint16_t csum = 0;
MPTCP_DSS_OPT_SZ_CHK(dsn64->mdss_copt.mdss_len,
sizeof (struct mptcp_dsn64_opt) + csum_len);
mp_tp->mpt_flags |= MPTCPF_SND_64BITACK;
full_dsn = mptcp_ntoh64(dsn64->mdss_dsn);
NTOHL(dsn64->mdss_subflow_seqn);
NTOHS(dsn64->mdss_data_len);
if (csum_len != 0)
csum = *(uint16_t *)(void *)(cp + dsn64->mdss_copt.mdss_len - csum_len);
mptcp_update_rcv_state_meat(mp_tp, tp, full_dsn,
dsn64->mdss_subflow_seqn,
dsn64->mdss_data_len,
csum);
break;
}
case (MDSS_A | MDSS_a):
{
struct mptcp_data_ack64_opt *dack64;
dack64 = (struct mptcp_data_ack64_opt *)cp;
MPTCP_DSS_OPT_SZ_CHK(dack64->mdss_copt.mdss_len,
sizeof (struct mptcp_data_ack64_opt));
mp_tp->mpt_flags |= MPTCPF_RCVD_64BITACK;
full_dack = mptcp_ntoh64(dack64->mdss_ack);
mptcp_do_dss_opt_ack_meat(full_dack, mp_tp->mpt_sndwl1, tp, tiwin);
break;
}
case (MDSS_M | MDSS_m | MDSS_A):
{
struct mptcp_dss64_ack32_opt *dss_ack_rsp;
dss_ack_rsp = (struct mptcp_dss64_ack32_opt *)cp;
u_int64_t full_dsn;
uint16_t csum = 0;
MPTCP_DSS_OPT_SZ_CHK(dss_ack_rsp->mdss_copt.mdss_len,
sizeof (struct mptcp_dss64_ack32_opt) + csum_len);
u_int32_t dack = dss_ack_rsp->mdss_ack;
NTOHL(dack);
mp_tp->mpt_flags |= MPTCPF_SND_64BITACK;
MPTCP_EXTEND_DSN(mp_tp->mpt_snduna, dack, full_dack);
full_dsn = mptcp_ntoh64(dss_ack_rsp->mdss_dsn);
NTOHL(dss_ack_rsp->mdss_subflow_seqn);
NTOHS(dss_ack_rsp->mdss_data_len);
mptcp_do_dss_opt_ack_meat(full_dack, full_dsn, tp, tiwin);
if (csum_len != 0)
csum = *(uint16_t *)(void *)(cp + dss_ack_rsp->mdss_copt.mdss_len - csum_len);
mptcp_update_rcv_state_meat(mp_tp, tp, full_dsn,
dss_ack_rsp->mdss_subflow_seqn,
dss_ack_rsp->mdss_data_len,
csum);
break;
}
case (MDSS_M | MDSS_A | MDSS_a):
{
struct mptcp_dss32_ack64_opt *dss32_ack64_opt;
dss32_ack64_opt = (struct mptcp_dss32_ack64_opt *)cp;
u_int64_t full_dsn;
MPTCP_DSS_OPT_SZ_CHK(
dss32_ack64_opt->mdss_copt.mdss_len,
sizeof (struct mptcp_dss32_ack64_opt) + csum_len);
full_dack = mptcp_ntoh64(dss32_ack64_opt->mdss_ack);
NTOHL(dss32_ack64_opt->mdss_dsn);
mp_tp->mpt_flags |= MPTCPF_RCVD_64BITACK;
MPTCP_EXTEND_DSN(mp_tp->mpt_rcvnxt,
dss32_ack64_opt->mdss_dsn, full_dsn);
NTOHL(dss32_ack64_opt->mdss_subflow_seqn);
NTOHS(dss32_ack64_opt->mdss_data_len);
mptcp_do_dss_opt_ack_meat(full_dack, full_dsn, tp, tiwin);
if (csum_len == 0)
mptcp_update_rcv_state_meat(mp_tp, tp, full_dsn,
dss32_ack64_opt->mdss_subflow_seqn,
dss32_ack64_opt->mdss_data_len, 0);
else
mptcp_update_rcv_state_meat(mp_tp, tp, full_dsn,
dss32_ack64_opt->mdss_subflow_seqn,
dss32_ack64_opt->mdss_data_len,
*(uint16_t *)(void *)(cp +
dss32_ack64_opt->mdss_copt.mdss_len -
csum_len));
break;
}
case (MDSS_M | MDSS_m | MDSS_A | MDSS_a):
{
struct mptcp_dss64_ack64_opt *dss64_ack64;
dss64_ack64 = (struct mptcp_dss64_ack64_opt *)cp;
u_int64_t full_dsn;
MPTCP_DSS_OPT_SZ_CHK(dss64_ack64->mdss_copt.mdss_len,
sizeof (struct mptcp_dss64_ack64_opt) + csum_len);
mp_tp->mpt_flags |= MPTCPF_RCVD_64BITACK;
mp_tp->mpt_flags |= MPTCPF_SND_64BITACK;
full_dsn = mptcp_ntoh64(dss64_ack64->mdss_dsn);
full_dack = mptcp_ntoh64(dss64_ack64->mdss_dsn);
mptcp_do_dss_opt_ack_meat(full_dack, full_dsn, tp, tiwin);
NTOHL(dss64_ack64->mdss_subflow_seqn);
NTOHS(dss64_ack64->mdss_data_len);
if (csum_len == 0)
mptcp_update_rcv_state_meat(mp_tp, tp, full_dsn,
dss64_ack64->mdss_subflow_seqn,
dss64_ack64->mdss_data_len, 0);
else
mptcp_update_rcv_state_meat(mp_tp, tp, full_dsn,
dss64_ack64->mdss_subflow_seqn,
dss64_ack64->mdss_data_len,
*(uint16_t *)(void *)(cp +
dss64_ack64->mdss_copt.mdss_len -
csum_len));
break;
}
default:
mptcplog((LOG_DEBUG,"%s: File bug, DSS flags = %x\n",
__func__, dss_rsp->mdss_flags),
(MPTCP_SOCKET_DBG|MPTCP_RECEIVER_DBG),
MPTCP_LOGLVL_LOG);
break;
}
}
static void
mptcp_do_fin_opt(struct tcpcb *tp)
{
struct mptcb *mp_tp = tptomptp(tp);
if (!(tp->t_mpflags & TMPF_RECV_DFIN)) {
if (mp_tp != NULL) {
mptcp_close_fsm(mp_tp, MPCE_RECV_DATA_FIN);
if (tp->t_inpcb->inp_socket != NULL) {
soevent(tp->t_inpcb->inp_socket,
SO_FILT_HINT_LOCKED |
SO_FILT_HINT_MPCANTRCVMORE);
}
}
tp->t_mpflags |= TMPF_RECV_DFIN;
}
tp->t_mpflags |= TMPF_MPTCP_ACKNOW;
tp->t_flags |= TF_ACKNOW;
}
static void
mptcp_do_dss_opt(struct tcpcb *tp, u_char *cp, struct tcphdr *th, int optlen)
{
#pragma unused(optlen)
struct mptcb *mp_tp = tptomptp(tp);
if (!mp_tp)
return;
if ((tp->t_mpflags & TMPF_MPTCP_TRUE) ||
(tp->t_mpflags & TMPF_TCP_FALLBACK)) {
struct mptcp_dss_copt *dss_rsp = (struct mptcp_dss_copt *)cp;
if (dss_rsp->mdss_subtype == MPO_DSS) {
if (dss_rsp->mdss_flags & MDSS_F) {
mptcp_do_fin_opt(tp);
}
mptcp_do_dss_opt_meat(cp, tp, th);
}
}
}
static void
mptcp_do_fastclose_opt(struct tcpcb *tp, u_char *cp, struct tcphdr *th)
{
struct mptcb *mp_tp = NULL;
struct mptcp_fastclose_opt *fc_opt = (struct mptcp_fastclose_opt *)cp;
if (th->th_flags != TH_ACK)
return;
if (fc_opt->mfast_len != sizeof (struct mptcp_fastclose_opt)) {
tcpstat.tcps_invalid_opt++;
return;
}
mp_tp = tptomptp(tp);
if (!mp_tp)
return;
if (fc_opt->mfast_key != mp_tp->mpt_localkey) {
tcpstat.tcps_invalid_opt++;
return;
}
if (th->th_seq != tp->rcv_nxt) {
tcpstat.tcps_invalid_opt++;
return;
}
tp->t_mpflags |= (TMPF_RESET | TMPF_FASTCLOSERCV);
if (tp->t_inpcb->inp_socket != NULL) {
soevent(tp->t_inpcb->inp_socket,
SO_FILT_HINT_LOCKED | SO_FILT_HINT_MUSTRST);
}
}
static void
mptcp_do_mpfail_opt(struct tcpcb *tp, u_char *cp, struct tcphdr *th)
{
struct mptcb *mp_tp = NULL;
struct mptcp_mpfail_opt *fail_opt = (struct mptcp_mpfail_opt *)cp;
u_int32_t mdss_subflow_seqn = 0;
int error = 0;
if (th->th_seq != tp->rcv_nxt) {
tcpstat.tcps_invalid_opt++;
return;
}
if ((th->th_flags != TH_ACK) && (th->th_flags != TH_RST))
return;
if (fail_opt->mfail_len != sizeof (struct mptcp_mpfail_opt))
return;
mp_tp = tptomptp(tp);
mp_tp->mpt_flags |= MPTCPF_RECVD_MPFAIL;
mp_tp->mpt_dsn_at_csum_fail = mptcp_hton64(fail_opt->mfail_dsn);
error = mptcp_get_map_for_dsn(tp->t_inpcb->inp_socket,
mp_tp->mpt_dsn_at_csum_fail, &mdss_subflow_seqn);
if (error == 0) {
mp_tp->mpt_ssn_at_csum_fail = mdss_subflow_seqn;
}
mptcp_notify_mpfail(tp->t_inpcb->inp_socket);
}
void
tcp_do_mptcp_options(struct tcpcb *tp, u_char *cp, struct tcphdr *th,
struct tcpopt *to, int optlen)
{
int mptcp_subtype;
struct mptcb *mp_tp = tptomptp(tp);
if (mp_tp == NULL)
return;
mpte_lock_assert_held(mp_tp->mpt_mpte);
if (optlen < 4)
return;
mptcp_subtype = (cp[2] >> 4);
if (mptcp_sanitize_option(tp, mptcp_subtype) == 0)
return;
switch (mptcp_subtype) {
case MPO_CAPABLE:
mptcp_do_mpcapable_opt(tp, cp, th, optlen);
break;
case MPO_JOIN:
mptcp_do_mpjoin_opt(tp, cp, th, optlen);
break;
case MPO_DSS:
mptcp_do_dss_opt(tp, cp, th, optlen);
break;
case MPO_FASTCLOSE:
mptcp_do_fastclose_opt(tp, cp, th);
break;
case MPO_FAIL:
mptcp_do_mpfail_opt(tp, cp, th);
break;
case MPO_ADD_ADDR:
case MPO_REMOVE_ADDR:
case MPO_PRIO:
to->to_flags |= TOF_MPTCP;
break;
default:
break;
}
return;
}
static void
mptcp_send_remaddr_opt(struct tcpcb *tp, struct mptcp_remaddr_opt *opt)
{
mptcplog((LOG_DEBUG,"%s: local id %d remove id %d \n",
__func__, tp->t_local_aid, tp->t_rem_aid),
(MPTCP_SOCKET_DBG|MPTCP_SENDER_DBG), MPTCP_LOGLVL_LOG);
bzero(opt, sizeof (*opt));
opt->mr_kind = TCPOPT_MULTIPATH;
opt->mr_len = sizeof (*opt);
opt->mr_subtype = MPO_REMOVE_ADDR;
opt->mr_addr_id = tp->t_rem_aid;
tp->t_mpflags &= ~TMPF_SND_REM_ADDR;
}
static int
mptcp_snd_mpprio(struct tcpcb *tp, u_char *cp, int optlen)
{
struct mptcp_mpprio_addr_opt mpprio;
if (tp->t_state != TCPS_ESTABLISHED) {
tp->t_mpflags &= ~TMPF_SND_MPPRIO;
return (optlen);
}
if ((MAX_TCPOPTLEN - optlen) <
(int)sizeof (mpprio))
return (optlen);
bzero(&mpprio, sizeof (mpprio));
mpprio.mpprio_kind = TCPOPT_MULTIPATH;
mpprio.mpprio_len = sizeof (mpprio);
mpprio.mpprio_subtype = MPO_PRIO;
if (tp->t_mpflags & TMPF_BACKUP_PATH)
mpprio.mpprio_flags |= MPTCP_MPPRIO_BKP;
mpprio.mpprio_addrid = tp->t_local_aid;
memcpy(cp + optlen, &mpprio, sizeof (mpprio));
optlen += sizeof (mpprio);
tp->t_mpflags &= ~TMPF_SND_MPPRIO;
mptcplog((LOG_DEBUG, "%s: aid = %d \n", __func__,
tp->t_local_aid),
(MPTCP_SOCKET_DBG|MPTCP_SENDER_DBG), MPTCP_LOGLVL_LOG);
return (optlen);
}