summaryrefslogtreecommitdiff
path: root/net/mptcp/options.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/mptcp/options.c')
-rw-r--r--net/mptcp/options.c107
1 files changed, 95 insertions, 12 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index a3661318a7af..8e2b2dbadf6d 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++;
@@ -572,37 +604,80 @@ 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_fully_established(struct mptcp_subflow_context *subflow,
+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->fully_established ||
- 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;
+ }
+
+ /* 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 (mp_opt->use_ack)
+ if (mp_opt->use_ack) {
+ /* subflows are fully established as soon as we get any
+ * additional ack.
+ */
subflow->fully_established = 1;
+ goto fully_established;
+ }
- if (subflow->can_ack)
- return true;
+ 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)
+ mptcp_pm_subflow_established(msk, subflow);
+ else
+ mptcp_pm_fully_established(msk);
return true;
}
@@ -641,7 +716,7 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
struct mptcp_ext *mpext;
mp_opt = &opt_rx->mptcp;
- if (!check_fully_established(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)) {
@@ -700,8 +775,6 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
}
mpext->data_fin = mp_opt->data_fin;
-
- mptcp_pm_fully_established(msk);
}
void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts)
@@ -787,6 +860,16 @@ mp_capable_done:
0, opts->rm_id);
}
+ 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 (opts->ext_copy.use_ack || opts->ext_copy.use_map) {
struct mptcp_ext *mpext = &opts->ext_copy;
u8 len = TCPOLEN_MPTCP_DSS_BASE;