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-rw-r--r--net/mptcp/options.c553
1 files changed, 492 insertions, 61 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index fd2c3150e591..bd220ee4aac9 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -96,6 +96,38 @@ void mptcp_parse_option(const struct sk_buff *skb, const unsigned char *ptr,
mp_opt->rcvr_key, mp_opt->data_len);
break;
+ case MPTCPOPT_MP_JOIN:
+ mp_opt->mp_join = 1;
+ if (opsize == TCPOLEN_MPTCP_MPJ_SYN) {
+ mp_opt->backup = *ptr++ & MPTCPOPT_BACKUP;
+ mp_opt->join_id = *ptr++;
+ mp_opt->token = get_unaligned_be32(ptr);
+ ptr += 4;
+ mp_opt->nonce = get_unaligned_be32(ptr);
+ ptr += 4;
+ pr_debug("MP_JOIN bkup=%u, id=%u, token=%u, nonce=%u",
+ mp_opt->backup, mp_opt->join_id,
+ mp_opt->token, mp_opt->nonce);
+ } else if (opsize == TCPOLEN_MPTCP_MPJ_SYNACK) {
+ mp_opt->backup = *ptr++ & MPTCPOPT_BACKUP;
+ mp_opt->join_id = *ptr++;
+ mp_opt->thmac = get_unaligned_be64(ptr);
+ ptr += 8;
+ mp_opt->nonce = get_unaligned_be32(ptr);
+ ptr += 4;
+ pr_debug("MP_JOIN bkup=%u, id=%u, thmac=%llu, nonce=%u",
+ mp_opt->backup, mp_opt->join_id,
+ mp_opt->thmac, mp_opt->nonce);
+ } else if (opsize == TCPOLEN_MPTCP_MPJ_ACK) {
+ ptr += 2;
+ memcpy(mp_opt->hmac, ptr, MPTCPOPT_HMAC_LEN);
+ pr_debug("MP_JOIN hmac");
+ } else {
+ pr_warn("MP_JOIN bad option size");
+ mp_opt->mp_join = 0;
+ }
+ break;
+
case MPTCPOPT_DSS:
pr_debug("DSS");
ptr++;
@@ -178,6 +210,71 @@ void mptcp_parse_option(const struct sk_buff *skb, const unsigned char *ptr,
break;
+ case MPTCPOPT_ADD_ADDR:
+ mp_opt->echo = (*ptr++) & MPTCP_ADDR_ECHO;
+ if (!mp_opt->echo) {
+ if (opsize == TCPOLEN_MPTCP_ADD_ADDR ||
+ opsize == TCPOLEN_MPTCP_ADD_ADDR_PORT)
+ mp_opt->family = MPTCP_ADDR_IPVERSION_4;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ else if (opsize == TCPOLEN_MPTCP_ADD_ADDR6 ||
+ opsize == TCPOLEN_MPTCP_ADD_ADDR6_PORT)
+ mp_opt->family = MPTCP_ADDR_IPVERSION_6;
+#endif
+ else
+ break;
+ } else {
+ if (opsize == TCPOLEN_MPTCP_ADD_ADDR_BASE ||
+ opsize == TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT)
+ mp_opt->family = MPTCP_ADDR_IPVERSION_4;
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ else if (opsize == TCPOLEN_MPTCP_ADD_ADDR6_BASE ||
+ opsize == TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT)
+ mp_opt->family = MPTCP_ADDR_IPVERSION_6;
+#endif
+ else
+ break;
+ }
+
+ mp_opt->add_addr = 1;
+ mp_opt->port = 0;
+ mp_opt->addr_id = *ptr++;
+ pr_debug("ADD_ADDR: id=%d", mp_opt->addr_id);
+ if (mp_opt->family == MPTCP_ADDR_IPVERSION_4) {
+ memcpy((u8 *)&mp_opt->addr.s_addr, (u8 *)ptr, 4);
+ ptr += 4;
+ if (opsize == TCPOLEN_MPTCP_ADD_ADDR_PORT ||
+ opsize == TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT) {
+ mp_opt->port = get_unaligned_be16(ptr);
+ ptr += 2;
+ }
+ }
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ else {
+ memcpy(mp_opt->addr6.s6_addr, (u8 *)ptr, 16);
+ ptr += 16;
+ if (opsize == TCPOLEN_MPTCP_ADD_ADDR6_PORT ||
+ opsize == TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT) {
+ mp_opt->port = get_unaligned_be16(ptr);
+ ptr += 2;
+ }
+ }
+#endif
+ if (!mp_opt->echo) {
+ mp_opt->ahmac = get_unaligned_be64(ptr);
+ ptr += 8;
+ }
+ break;
+
+ case MPTCPOPT_RM_ADDR:
+ if (opsize != TCPOLEN_MPTCP_RM_ADDR_BASE)
+ break;
+
+ mp_opt->rm_addr = 1;
+ mp_opt->rm_id = *ptr++;
+ pr_debug("RM_ADDR: id=%d", mp_opt->rm_id);
+ break;
+
default:
break;
}
@@ -231,6 +328,16 @@ bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
opts->sndr_key = subflow->local_key;
*size = TCPOLEN_MPTCP_MPC_SYN;
return true;
+ } else if (subflow->request_join) {
+ pr_debug("remote_token=%u, nonce=%u", subflow->remote_token,
+ subflow->local_nonce);
+ opts->suboptions = OPTION_MPTCP_MPJ_SYN;
+ opts->join_id = subflow->local_id;
+ opts->token = subflow->remote_token;
+ opts->nonce = subflow->local_nonce;
+ opts->backup = subflow->request_bkup;
+ *size = TCPOLEN_MPTCP_MPJ_SYN;
+ return true;
}
return false;
}
@@ -240,16 +347,55 @@ void mptcp_rcv_synsent(struct sock *sk)
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct tcp_sock *tp = tcp_sk(sk);
- pr_debug("subflow=%p", subflow);
if (subflow->request_mptcp && tp->rx_opt.mptcp.mp_capable) {
subflow->mp_capable = 1;
subflow->can_ack = 1;
subflow->remote_key = tp->rx_opt.mptcp.sndr_key;
- } else {
+ pr_debug("subflow=%p, remote_key=%llu", subflow,
+ subflow->remote_key);
+ } else if (subflow->request_join && tp->rx_opt.mptcp.mp_join) {
+ subflow->mp_join = 1;
+ subflow->thmac = tp->rx_opt.mptcp.thmac;
+ subflow->remote_nonce = tp->rx_opt.mptcp.nonce;
+ pr_debug("subflow=%p, thmac=%llu, remote_nonce=%u", subflow,
+ subflow->thmac, subflow->remote_nonce);
+ } else if (subflow->request_mptcp) {
tcp_sk(sk)->is_mptcp = 0;
}
}
+/* MP_JOIN client subflow must wait for 4th ack before sending any data:
+ * TCP can't schedule delack timer before the subflow is fully established.
+ * MPTCP uses the delack timer to do 3rd ack retransmissions
+ */
+static void schedule_3rdack_retransmission(struct sock *sk)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+ unsigned long timeout;
+
+ /* reschedule with a timeout above RTT, as we must look only for drop */
+ if (tp->srtt_us)
+ timeout = tp->srtt_us << 1;
+ else
+ timeout = TCP_TIMEOUT_INIT;
+
+ WARN_ON_ONCE(icsk->icsk_ack.pending & ICSK_ACK_TIMER);
+ icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER;
+ icsk->icsk_ack.timeout = timeout;
+ sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout);
+}
+
+static void clear_3rdack_retransmission(struct sock *sk)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ sk_stop_timer(sk, &icsk->icsk_delack_timer);
+ icsk->icsk_ack.timeout = 0;
+ icsk->icsk_ack.ato = 0;
+ icsk->icsk_ack.pending &= ~(ICSK_ACK_SCHED | ICSK_ACK_TIMER);
+}
+
static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
unsigned int *size,
unsigned int remaining,
@@ -259,17 +405,21 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
struct mptcp_ext *mpext;
unsigned int data_len;
- pr_debug("subflow=%p fourth_ack=%d seq=%x:%x remaining=%d", subflow,
- subflow->fourth_ack, subflow->snd_isn,
- skb ? TCP_SKB_CB(skb)->seq : 0, remaining);
+ /* When skb is not available, we better over-estimate the emitted
+ * options len. A full DSS option (28 bytes) is longer than
+ * TCPOLEN_MPTCP_MPC_ACK_DATA(22) or TCPOLEN_MPTCP_MPJ_ACK(24), so
+ * tell the caller to defer the estimate to
+ * mptcp_established_options_dss(), which will reserve enough space.
+ */
+ if (!skb)
+ return false;
- if (subflow->mp_capable && !subflow->fourth_ack && skb &&
- subflow->snd_isn == TCP_SKB_CB(skb)->seq) {
- /* When skb is not available, we better over-estimate the
- * emitted options len. A full DSS option is longer than
- * TCPOLEN_MPTCP_MPC_ACK_DATA, so let's the caller try to fit
- * that.
- */
+ /* MPC/MPJ needed only on 3rd ack packet */
+ if (subflow->fully_established ||
+ subflow->snd_isn != TCP_SKB_CB(skb)->seq)
+ return false;
+
+ if (subflow->mp_capable) {
mpext = mptcp_get_ext(skb);
data_len = mpext ? mpext->data_len : 0;
@@ -297,6 +447,14 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
data_len);
return true;
+ } else if (subflow->mp_join) {
+ opts->suboptions = OPTION_MPTCP_MPJ_ACK;
+ memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);
+ *size = TCPOLEN_MPTCP_MPJ_ACK;
+ pr_debug("subflow=%p", subflow);
+
+ schedule_3rdack_retransmission(sk);
+ return true;
}
return false;
}
@@ -304,21 +462,22 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,
struct mptcp_ext *ext)
{
- ext->data_fin = 1;
-
if (!ext->use_map) {
/* RFC6824 requires a DSS mapping with specific values
* if DATA_FIN is set but no data payload is mapped
*/
+ ext->data_fin = 1;
ext->use_map = 1;
ext->dsn64 = 1;
- ext->data_seq = mptcp_sk(subflow->conn)->write_seq;
+ ext->data_seq = subflow->data_fin_tx_seq;
ext->subflow_seq = 0;
ext->data_len = 1;
- } else {
- /* If there's an existing DSS mapping, DATA_FIN consumes
- * 1 additional byte of mapping space.
+ } else if (ext->data_seq + ext->data_len == subflow->data_fin_tx_seq) {
+ /* If there's an existing DSS mapping and it is the
+ * final mapping, DATA_FIN consumes 1 additional byte of
+ * mapping space.
*/
+ ext->data_fin = 1;
ext->data_len++;
}
}
@@ -334,8 +493,6 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
struct mptcp_sock *msk;
unsigned int ack_size;
bool ret = false;
- bool can_ack;
- u64 ack_seq;
u8 tcp_fin;
if (skb) {
@@ -356,8 +513,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
if (mpext)
opts->ext_copy = *mpext;
- if (skb && tcp_fin &&
- subflow->conn->sk_state != TCP_ESTABLISHED)
+ if (skb && tcp_fin && subflow->data_fin_tx_enable)
mptcp_write_data_fin(subflow, &opts->ext_copy);
ret = true;
}
@@ -365,19 +521,9 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
/* passive sockets msk will set the 'can_ack' after accept(), even
* if the first subflow may have the already the remote key handy
*/
- can_ack = true;
opts->ext_copy.use_ack = 0;
msk = mptcp_sk(subflow->conn);
- if (likely(msk && READ_ONCE(msk->can_ack))) {
- ack_seq = msk->ack_seq;
- } else if (subflow->can_ack) {
- mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq);
- ack_seq++;
- } else {
- can_ack = false;
- }
-
- if (unlikely(!can_ack)) {
+ if (!READ_ONCE(msk->can_ack)) {
*size = ALIGN(dss_size, 4);
return ret;
}
@@ -390,7 +536,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
dss_size += ack_size;
- opts->ext_copy.data_ack = ack_seq;
+ opts->ext_copy.data_ack = msk->ack_seq;
opts->ext_copy.ack64 = 1;
opts->ext_copy.use_ack = 1;
@@ -398,6 +544,83 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
return true;
}
+static u64 add_addr_generate_hmac(u64 key1, u64 key2, u8 addr_id,
+ struct in_addr *addr)
+{
+ u8 hmac[MPTCP_ADDR_HMAC_LEN];
+ u8 msg[7];
+
+ msg[0] = addr_id;
+ memcpy(&msg[1], &addr->s_addr, 4);
+ msg[5] = 0;
+ msg[6] = 0;
+
+ mptcp_crypto_hmac_sha(key1, key2, msg, 7, hmac);
+
+ return get_unaligned_be64(hmac);
+}
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+static u64 add_addr6_generate_hmac(u64 key1, u64 key2, u8 addr_id,
+ struct in6_addr *addr)
+{
+ u8 hmac[MPTCP_ADDR_HMAC_LEN];
+ u8 msg[19];
+
+ msg[0] = addr_id;
+ memcpy(&msg[1], &addr->s6_addr, 16);
+ msg[17] = 0;
+ msg[18] = 0;
+
+ mptcp_crypto_hmac_sha(key1, key2, msg, 19, hmac);
+
+ return get_unaligned_be64(hmac);
+}
+#endif
+
+static bool mptcp_established_options_addr(struct sock *sk,
+ unsigned int *size,
+ unsigned int remaining,
+ struct mptcp_out_options *opts)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+ struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+ struct mptcp_addr_info saddr;
+ int len;
+
+ if (!mptcp_pm_should_signal(msk) ||
+ !(mptcp_pm_addr_signal(msk, remaining, &saddr)))
+ return false;
+
+ len = mptcp_add_addr_len(saddr.family);
+ if (remaining < len)
+ return false;
+
+ *size = len;
+ opts->addr_id = saddr.id;
+ if (saddr.family == AF_INET) {
+ opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
+ opts->addr = saddr.addr;
+ opts->ahmac = add_addr_generate_hmac(msk->local_key,
+ msk->remote_key,
+ opts->addr_id,
+ &opts->addr);
+ }
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ else if (saddr.family == AF_INET6) {
+ opts->suboptions |= OPTION_MPTCP_ADD_ADDR6;
+ opts->addr6 = saddr.addr6;
+ opts->ahmac = add_addr6_generate_hmac(msk->local_key,
+ msk->remote_key,
+ opts->addr_id,
+ &opts->addr6);
+ }
+#endif
+ pr_debug("addr_id=%d, ahmac=%llu", opts->addr_id, opts->ahmac);
+
+ return true;
+}
+
bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
unsigned int *size, unsigned int remaining,
struct mptcp_out_options *opts)
@@ -405,6 +628,8 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
unsigned int opt_size = 0;
bool ret = false;
+ opts->suboptions = 0;
+
if (mptcp_established_options_mp(sk, skb, &opt_size, remaining, opts))
ret = true;
else if (mptcp_established_options_dss(sk, skb, &opt_size, remaining,
@@ -419,6 +644,11 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
*size += opt_size;
remaining -= opt_size;
+ if (mptcp_established_options_addr(sk, &opt_size, remaining, opts)) {
+ *size += opt_size;
+ remaining -= opt_size;
+ ret = true;
+ }
return ret;
}
@@ -435,54 +665,194 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
pr_debug("subflow_req=%p, local_key=%llu",
subflow_req, subflow_req->local_key);
return true;
+ } else if (subflow_req->mp_join) {
+ opts->suboptions = OPTION_MPTCP_MPJ_SYNACK;
+ opts->backup = subflow_req->backup;
+ opts->join_id = subflow_req->local_id;
+ opts->thmac = subflow_req->thmac;
+ opts->nonce = subflow_req->local_nonce;
+ pr_debug("req=%p, bkup=%u, id=%u, thmac=%llu, nonce=%u",
+ subflow_req, opts->backup, opts->join_id,
+ opts->thmac, opts->nonce);
+ *size = TCPOLEN_MPTCP_MPJ_SYNACK;
+ return true;
}
return false;
}
-static bool check_fourth_ack(struct mptcp_subflow_context *subflow,
- struct sk_buff *skb,
- struct mptcp_options_received *mp_opt)
+static bool check_fully_established(struct mptcp_sock *msk, struct sock *sk,
+ struct mptcp_subflow_context *subflow,
+ struct sk_buff *skb,
+ struct mptcp_options_received *mp_opt)
{
/* here we can process OoO, in-window pkts, only in-sequence 4th ack
- * are relevant
+ * will make the subflow fully established
*/
- if (likely(subflow->fourth_ack ||
- TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1))
- return true;
+ if (likely(subflow->fully_established)) {
+ /* on passive sockets, check for 3rd ack retransmission
+ * note that msk is always set by subflow_syn_recv_sock()
+ * for mp_join subflows
+ */
+ if (TCP_SKB_CB(skb)->seq == subflow->ssn_offset + 1 &&
+ TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq &&
+ subflow->mp_join && mp_opt->mp_join &&
+ READ_ONCE(msk->pm.server_side))
+ tcp_send_ack(sk);
+ goto fully_established;
+ }
- if (mp_opt->use_ack)
- subflow->fourth_ack = 1;
+ /* we should process OoO packets before the first subflow is fully
+ * established, but not expected for MP_JOIN subflows
+ */
+ if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1)
+ return subflow->mp_capable;
- if (subflow->can_ack)
- return true;
+ if (mp_opt->use_ack) {
+ /* subflows are fully established as soon as we get any
+ * additional ack.
+ */
+ subflow->fully_established = 1;
+ goto fully_established;
+ }
+
+ WARN_ON_ONCE(subflow->can_ack);
/* If the first established packet does not contain MP_CAPABLE + data
* then fallback to TCP
*/
if (!mp_opt->mp_capable) {
subflow->mp_capable = 0;
- tcp_sk(mptcp_subflow_tcp_sock(subflow))->is_mptcp = 0;
+ tcp_sk(sk)->is_mptcp = 0;
return false;
}
+
+ subflow->fully_established = 1;
subflow->remote_key = mp_opt->sndr_key;
subflow->can_ack = 1;
+
+fully_established:
+ if (likely(subflow->pm_notified))
+ return true;
+
+ subflow->pm_notified = 1;
+ if (subflow->mp_join) {
+ clear_3rdack_retransmission(sk);
+ mptcp_pm_subflow_established(msk, subflow);
+ } else {
+ mptcp_pm_fully_established(msk);
+ }
return true;
}
+static u64 expand_ack(u64 old_ack, u64 cur_ack, bool use_64bit)
+{
+ u32 old_ack32, cur_ack32;
+
+ if (use_64bit)
+ return cur_ack;
+
+ old_ack32 = (u32)old_ack;
+ cur_ack32 = (u32)cur_ack;
+ cur_ack = (old_ack & GENMASK_ULL(63, 32)) + cur_ack32;
+ if (unlikely(before(cur_ack32, old_ack32)))
+ return cur_ack + (1LL << 32);
+ return cur_ack;
+}
+
+static void update_una(struct mptcp_sock *msk,
+ struct mptcp_options_received *mp_opt)
+{
+ u64 new_snd_una, snd_una, old_snd_una = atomic64_read(&msk->snd_una);
+ u64 write_seq = READ_ONCE(msk->write_seq);
+
+ /* avoid ack expansion on update conflict, to reduce the risk of
+ * wrongly expanding to a future ack sequence number, which is way
+ * more dangerous than missing an ack
+ */
+ new_snd_una = expand_ack(old_snd_una, mp_opt->data_ack, mp_opt->ack64);
+
+ /* ACK for data not even sent yet? Ignore. */
+ if (after64(new_snd_una, write_seq))
+ new_snd_una = old_snd_una;
+
+ while (after64(new_snd_una, old_snd_una)) {
+ snd_una = old_snd_una;
+ old_snd_una = atomic64_cmpxchg(&msk->snd_una, snd_una,
+ new_snd_una);
+ if (old_snd_una == snd_una) {
+ mptcp_data_acked((struct sock *)msk);
+ break;
+ }
+ }
+}
+
+static bool add_addr_hmac_valid(struct mptcp_sock *msk,
+ struct mptcp_options_received *mp_opt)
+{
+ u64 hmac = 0;
+
+ if (mp_opt->echo)
+ return true;
+
+ if (mp_opt->family == MPTCP_ADDR_IPVERSION_4)
+ hmac = add_addr_generate_hmac(msk->remote_key,
+ msk->local_key,
+ mp_opt->addr_id, &mp_opt->addr);
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ else
+ hmac = add_addr6_generate_hmac(msk->remote_key,
+ msk->local_key,
+ mp_opt->addr_id, &mp_opt->addr6);
+#endif
+
+ pr_debug("msk=%p, ahmac=%llu, mp_opt->ahmac=%llu\n",
+ msk, (unsigned long long)hmac,
+ (unsigned long long)mp_opt->ahmac);
+
+ return hmac == mp_opt->ahmac;
+}
+
void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
struct tcp_options_received *opt_rx)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+ struct mptcp_sock *msk = mptcp_sk(subflow->conn);
struct mptcp_options_received *mp_opt;
struct mptcp_ext *mpext;
mp_opt = &opt_rx->mptcp;
- if (!check_fourth_ack(subflow, skb, mp_opt))
+ if (!check_fully_established(msk, sk, subflow, skb, mp_opt))
return;
+ if (mp_opt->add_addr && add_addr_hmac_valid(msk, mp_opt)) {
+ struct mptcp_addr_info addr;
+
+ addr.port = htons(mp_opt->port);
+ addr.id = mp_opt->addr_id;
+ if (mp_opt->family == MPTCP_ADDR_IPVERSION_4) {
+ addr.family = AF_INET;
+ addr.addr = mp_opt->addr;
+ }
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ else if (mp_opt->family == MPTCP_ADDR_IPVERSION_6) {
+ addr.family = AF_INET6;
+ addr.addr6 = mp_opt->addr6;
+ }
+#endif
+ if (!mp_opt->echo)
+ mptcp_pm_add_addr_received(msk, &addr);
+ mp_opt->add_addr = 0;
+ }
+
if (!mp_opt->dss)
return;
+ /* we can't wait for recvmsg() to update the ack_seq, otherwise
+ * monodirectional flows will stuck
+ */
+ if (mp_opt->use_ack)
+ update_una(msk, mp_opt);
+
mpext = skb_ext_add(skb, SKB_EXT_MPTCP);
if (!mpext)
return;
@@ -509,12 +879,6 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
mpext->use_map = 1;
}
- if (mp_opt->use_ack) {
- mpext->data_ack = mp_opt->data_ack;
- mpext->use_ack = 1;
- mpext->ack64 = mp_opt->ack64;
- }
-
mpext->data_fin = mp_opt->data_fin;
}
@@ -533,10 +897,9 @@ void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts)
else
len = TCPOLEN_MPTCP_MPC_ACK;
- *ptr++ = htonl((TCPOPT_MPTCP << 24) | (len << 16) |
- (MPTCPOPT_MP_CAPABLE << 12) |
- (MPTCP_SUPPORTED_VERSION << 8) |
- MPTCP_CAP_HMAC_SHA256);
+ *ptr++ = mptcp_option(MPTCPOPT_MP_CAPABLE, len,
+ MPTCP_SUPPORTED_VERSION,
+ MPTCP_CAP_HMAC_SHA256);
if (!((OPTION_MPTCP_MPC_SYNACK | OPTION_MPTCP_MPC_ACK) &
opts->suboptions))
@@ -558,6 +921,77 @@ void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts)
}
mp_capable_done:
+ if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {
+ if (opts->ahmac)
+ *ptr++ = mptcp_option(MPTCPOPT_ADD_ADDR,
+ TCPOLEN_MPTCP_ADD_ADDR, 0,
+ opts->addr_id);
+ else
+ *ptr++ = mptcp_option(MPTCPOPT_ADD_ADDR,
+ TCPOLEN_MPTCP_ADD_ADDR_BASE,
+ MPTCP_ADDR_ECHO,
+ opts->addr_id);
+ memcpy((u8 *)ptr, (u8 *)&opts->addr.s_addr, 4);
+ ptr += 1;
+ if (opts->ahmac) {
+ put_unaligned_be64(opts->ahmac, ptr);
+ ptr += 2;
+ }
+ }
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if (OPTION_MPTCP_ADD_ADDR6 & opts->suboptions) {
+ if (opts->ahmac)
+ *ptr++ = mptcp_option(MPTCPOPT_ADD_ADDR,
+ TCPOLEN_MPTCP_ADD_ADDR6, 0,
+ opts->addr_id);
+ else
+ *ptr++ = mptcp_option(MPTCPOPT_ADD_ADDR,
+ TCPOLEN_MPTCP_ADD_ADDR6_BASE,
+ MPTCP_ADDR_ECHO,
+ opts->addr_id);
+ memcpy((u8 *)ptr, opts->addr6.s6_addr, 16);
+ ptr += 4;
+ if (opts->ahmac) {
+ put_unaligned_be64(opts->ahmac, ptr);
+ ptr += 2;
+ }
+ }
+#endif
+
+ if (OPTION_MPTCP_RM_ADDR & opts->suboptions) {
+ *ptr++ = mptcp_option(MPTCPOPT_RM_ADDR,
+ TCPOLEN_MPTCP_RM_ADDR_BASE,
+ 0, opts->rm_id);
+ }
+
+ if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) {
+ *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
+ TCPOLEN_MPTCP_MPJ_SYN,
+ opts->backup, opts->join_id);
+ put_unaligned_be32(opts->token, ptr);
+ ptr += 1;
+ put_unaligned_be32(opts->nonce, ptr);
+ ptr += 1;
+ }
+
+ if (OPTION_MPTCP_MPJ_SYNACK & opts->suboptions) {
+ *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
+ TCPOLEN_MPTCP_MPJ_SYNACK,
+ opts->backup, opts->join_id);
+ put_unaligned_be64(opts->thmac, ptr);
+ ptr += 2;
+ put_unaligned_be32(opts->nonce, ptr);
+ ptr += 1;
+ }
+
+ if (OPTION_MPTCP_MPJ_ACK & opts->suboptions) {
+ *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
+ TCPOLEN_MPTCP_MPJ_ACK, 0, 0);
+ memcpy(ptr, opts->hmac, MPTCPOPT_HMAC_LEN);
+ ptr += 5;
+ }
+
if (opts->ext_copy.use_ack || opts->ext_copy.use_map) {
struct mptcp_ext *mpext = &opts->ext_copy;
u8 len = TCPOLEN_MPTCP_DSS_BASE;
@@ -579,10 +1013,7 @@ mp_capable_done:
flags |= MPTCP_DSS_DATA_FIN;
}
- *ptr++ = htonl((TCPOPT_MPTCP << 24) |
- (len << 16) |
- (MPTCPOPT_DSS << 12) |
- (flags));
+ *ptr++ = mptcp_option(MPTCPOPT_DSS, len, 0, flags);
if (mpext->use_ack) {
put_unaligned_be64(mpext->data_ack, ptr);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 08:37:45 +0000