diff options
Diffstat (limited to 'net/mptcp/options.c')
| -rw-r--r-- | net/mptcp/options.c | 553 |
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); |