mptcp: consolidate in_opt sub-options fields in a bitmask

This makes input options processing more consistent with
output ones and will simplify the next patch.

Also avoid clearing the suboption field after processing
it, since it's not needed.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 79b68ae..0d33c02 100644 (file)
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -81,11 +81,11 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                 * is if both hosts in their SYNs set A=0."
                 */
                if (flags & MPTCP_CAP_CHECKSUM_REQD)
-                       mp_opt->csum_reqd = 1;
+                       mp_opt->suboptions |= OPTION_MPTCP_CSUMREQD;
 
                mp_opt->deny_join_id0 = !!(flags & MPTCP_CAP_DENY_JOIN_ID0);
 
-               mp_opt->mp_capable = 1;
+               mp_opt->suboptions |= OPTIONS_MPTCP_MPC;
                if (opsize >= TCPOLEN_MPTCP_MPC_SYNACK) {
                        mp_opt->sndr_key = get_unaligned_be64(ptr);
                        ptr += 8;
@@ -100,7 +100,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                         * equivalent to those in a DSS option and can be used
                         * interchangeably."
                         */
-                       mp_opt->dss = 1;
+                       mp_opt->suboptions |= OPTION_MPTCP_DSS;
                        mp_opt->use_map = 1;
                        mp_opt->mpc_map = 1;
                        mp_opt->data_len = get_unaligned_be16(ptr);
@@ -108,7 +108,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                }
                if (opsize == TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM) {
                        mp_opt->csum = (__force __sum16)get_unaligned_be16(ptr);
-                       mp_opt->csum_reqd = 1;
+                       mp_opt->suboptions |= OPTION_MPTCP_CSUMREQD;
                        ptr += 2;
                }
                pr_debug("MP_CAPABLE version=%x, flags=%x, optlen=%d sndr=%llu, rcvr=%llu len=%d csum=%u",
@@ -117,7 +117,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                break;
 
        case MPTCPOPT_MP_JOIN:
-               mp_opt->mp_join = 1;
+               mp_opt->suboptions |= OPTIONS_MPTCP_MPJ;
                if (opsize == TCPOLEN_MPTCP_MPJ_SYN) {
                        mp_opt->backup = *ptr++ & MPTCPOPT_BACKUP;
                        mp_opt->join_id = *ptr++;
@@ -143,7 +143,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                        memcpy(mp_opt->hmac, ptr, MPTCPOPT_HMAC_LEN);
                        pr_debug("MP_JOIN hmac");
                } else {
-                       mp_opt->mp_join = 0;
+                       mp_opt->suboptions &= ~OPTIONS_MPTCP_MPJ;
                }
                break;
 
@@ -191,8 +191,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                    opsize != expected_opsize + TCPOLEN_MPTCP_DSS_CHECKSUM)
                        break;
 
-               mp_opt->dss = 1;
-
+               mp_opt->suboptions |= OPTION_MPTCP_DSS;
                if (mp_opt->use_ack) {
                        if (mp_opt->ack64) {
                                mp_opt->data_ack = get_unaligned_be64(ptr);
@@ -221,14 +220,15 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                        ptr += 2;
 
                        if (opsize == expected_opsize + TCPOLEN_MPTCP_DSS_CHECKSUM) {
-                               mp_opt->csum_reqd = 1;
+                               mp_opt->suboptions |= OPTION_MPTCP_CSUMREQD;
                                mp_opt->csum = (__force __sum16)get_unaligned_be16(ptr);
                                ptr += 2;
                        }
 
                        pr_debug("data_seq=%llu subflow_seq=%u data_len=%u csum=%d:%u",
                                 mp_opt->data_seq, mp_opt->subflow_seq,
-                                mp_opt->data_len, mp_opt->csum_reqd, mp_opt->csum);
+                                mp_opt->data_len, !!(mp_opt->suboptions & OPTION_MPTCP_CSUMREQD),
+                                mp_opt->csum);
                }
 
                break;
@@ -259,7 +259,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                                break;
                }
 
-               mp_opt->add_addr = 1;
+               mp_opt->suboptions |= OPTION_MPTCP_ADD_ADDR;
                mp_opt->addr.id = *ptr++;
                mp_opt->addr.port = 0;
                mp_opt->ahmac = 0;
@@ -299,7 +299,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 
                ptr++;
 
-               mp_opt->rm_addr = 1;
+               mp_opt->suboptions |= OPTION_MPTCP_RM_ADDR;
                mp_opt->rm_list.nr = opsize - TCPOLEN_MPTCP_RM_ADDR_BASE;
                for (i = 0; i < mp_opt->rm_list.nr; i++)
                        mp_opt->rm_list.ids[i] = *ptr++;
@@ -310,7 +310,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                if (opsize != TCPOLEN_MPTCP_PRIO)
                        break;
 
-               mp_opt->mp_prio = 1;
+               mp_opt->suboptions |= OPTION_MPTCP_PRIO;
                mp_opt->backup = *ptr++ & MPTCP_PRIO_BKUP;
                pr_debug("MP_PRIO: prio=%d", mp_opt->backup);
                break;
@@ -322,7 +322,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                ptr += 2;
                mp_opt->rcvr_key = get_unaligned_be64(ptr);
                ptr += 8;
-               mp_opt->fastclose = 1;
+               mp_opt->suboptions |= OPTION_MPTCP_FASTCLOSE;
                break;
 
        case MPTCPOPT_RST:
@@ -331,7 +331,8 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 
                if (!(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_RST))
                        break;
-               mp_opt->reset = 1;
+
+               mp_opt->suboptions |= OPTION_MPTCP_RST;
                flags = *ptr++;
                mp_opt->reset_transient = flags & MPTCP_RST_TRANSIENT;
                mp_opt->reset_reason = *ptr;
@@ -342,7 +343,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                        break;
 
                ptr += 2;
-               mp_opt->mp_fail = 1;
+               mp_opt->suboptions |= OPTION_MPTCP_FAIL;
                mp_opt->fail_seq = get_unaligned_be64(ptr);
                pr_debug("MP_FAIL: data_seq=%llu", mp_opt->fail_seq);
                break;
@@ -361,16 +362,7 @@ void mptcp_get_options(const struct sock *sk,
        int length;
 
        /* initialize option status */
-       mp_opt->mp_capable = 0;
-       mp_opt->mp_join = 0;
-       mp_opt->add_addr = 0;
-       mp_opt->fastclose = 0;
-       mp_opt->rm_addr = 0;
-       mp_opt->dss = 0;
-       mp_opt->mp_prio = 0;
-       mp_opt->reset = 0;
-       mp_opt->csum_reqd = 0;
-       mp_opt->mp_fail = 0;
+       mp_opt->suboptions = 0;
 
        length = (th->doff * 4) - sizeof(struct tcphdr);
        ptr = (const unsigned char *)(th + 1);
@@ -924,7 +916,7 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
                 */
                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 &&
+                   subflow->mp_join && (mp_opt->suboptions & OPTIONS_MPTCP_MPJ) &&
                    READ_ONCE(msk->pm.server_side))
                        tcp_send_ack(ssk);
                goto fully_established;
@@ -941,8 +933,8 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
                return subflow->mp_capable;
        }
 
-       if ((mp_opt->dss && mp_opt->use_ack) ||
-           (mp_opt->add_addr && !mp_opt->echo)) {
+       if (((mp_opt->suboptions & OPTION_MPTCP_DSS) && mp_opt->use_ack) ||
+           ((mp_opt->suboptions & OPTION_MPTCP_ADD_ADDR) && !mp_opt->echo)) {
                /* subflows are fully established as soon as we get any
                 * additional ack, including ADD_ADDR.
                 */
@@ -955,7 +947,7 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
         * then fallback to TCP. Fallback scenarios requires a reset for
         * MP_JOIN subflows.
         */
-       if (!mp_opt->mp_capable) {
+       if (!(mp_opt->suboptions & OPTIONS_MPTCP_MPC)) {
                if (subflow->mp_join)
                        goto reset;
                subflow->mp_capable = 0;
@@ -1119,13 +1111,13 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
        if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))
                return sk->sk_state != TCP_CLOSE;
 
-       if (mp_opt.fastclose &&
+       if ((mp_opt.suboptions & OPTION_MPTCP_FASTCLOSE) &&
            msk->local_key == mp_opt.rcvr_key) {
                WRITE_ONCE(msk->rcv_fastclose, true);
                mptcp_schedule_work((struct sock *)msk);
        }
 
-       if (mp_opt.add_addr && add_addr_hmac_valid(msk, &mp_opt)) {
+       if ((mp_opt.suboptions & OPTION_MPTCP_ADD_ADDR) && add_addr_hmac_valid(msk, &mp_opt)) {
                if (!mp_opt.echo) {
                        mptcp_pm_add_addr_received(msk, &mp_opt.addr);
                        MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR);
@@ -1137,34 +1129,28 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
 
                if (mp_opt.addr.port)
                        MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_PORTADD);
-
-               mp_opt.add_addr = 0;
        }
 
-       if (mp_opt.rm_addr) {
+       if (mp_opt.suboptions & OPTION_MPTCP_RM_ADDR)
                mptcp_pm_rm_addr_received(msk, &mp_opt.rm_list);
-               mp_opt.rm_addr = 0;
-       }
 
-       if (mp_opt.mp_prio) {
+       if (mp_opt.suboptions & OPTION_MPTCP_PRIO) {
                mptcp_pm_mp_prio_received(sk, mp_opt.backup);
                MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIORX);
-               mp_opt.mp_prio = 0;
        }
 
-       if (mp_opt.mp_fail) {
+       if (mp_opt.suboptions & OPTION_MPTCP_FAIL) {
                mptcp_pm_mp_fail_received(sk, mp_opt.fail_seq);
                MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFAILRX);
-               mp_opt.mp_fail = 0;
        }
 
-       if (mp_opt.reset) {
+       if (mp_opt.suboptions & OPTION_MPTCP_RST) {
                subflow->reset_seen = 1;
                subflow->reset_reason = mp_opt.reset_reason;
                subflow->reset_transient = mp_opt.reset_transient;
        }
 
-       if (!mp_opt.dss)
+       if (!(mp_opt.suboptions & OPTION_MPTCP_DSS))
                return true;
 
        /* we can't wait for recvmsg() to update the ack_seq, otherwise
@@ -1213,7 +1199,7 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
                }
                mpext->data_len = mp_opt.data_len;
                mpext->use_map = 1;
-               mpext->csum_reqd = mp_opt.csum_reqd;
+               mpext->csum_reqd = !!(mp_opt.suboptions & OPTION_MPTCP_CSUMREQD);
 
                if (mpext->csum_reqd)
                        mpext->csum = mp_opt.csum;

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 22214a5..1a40839 100644 (file)
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2832,7 +2832,7 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
        msk->token = subflow_req->token;
        msk->subflow = NULL;
        WRITE_ONCE(msk->fully_established, false);
-       if (mp_opt->csum_reqd)
+       if (mp_opt->suboptions & OPTION_MPTCP_CSUMREQD)
                WRITE_ONCE(msk->csum_enabled, true);
 
        msk->write_seq = subflow_req->idsn + 1;
@@ -2841,7 +2841,7 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
        msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd;
        msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq;
 
-       if (mp_opt->mp_capable) {
+       if (mp_opt->suboptions & OPTIONS_MPTCP_MPC) {
                msk->can_ack = true;
                msk->remote_key = mp_opt->sndr_key;
                mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq);

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 9a0d91f..d7aba1c 100644 (file)
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -29,6 +29,13 @@
 #define OPTION_MPTCP_DSS       BIT(11)
 #define OPTION_MPTCP_FAIL      BIT(12)
 
+#define OPTION_MPTCP_CSUMREQD  BIT(13)
+
+#define OPTIONS_MPTCP_MPC      (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
+                                OPTION_MPTCP_MPC_ACK)
+#define OPTIONS_MPTCP_MPJ      (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
+                                OPTION_MPTCP_MPJ_SYNACK)
+
 /* MPTCP option subtypes */
 #define MPTCPOPT_MP_CAPABLE    0
 #define MPTCPOPT_MP_JOIN       1
@@ -132,16 +139,7 @@ struct mptcp_options_received {
        u32     subflow_seq;
        u16     data_len;
        __sum16 csum;
-       u16     mp_capable : 1,
-               mp_join : 1,
-               fastclose : 1,
-               reset : 1,
-               dss : 1,
-               add_addr : 1,
-               rm_addr : 1,
-               mp_prio : 1,
-               csum_reqd : 1,
-               mp_fail : 1;
+       u16     suboptions;
        u32     token;
        u32     nonce;
        u16     use_map:1,

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 54b7ffc..1de7ce8 100644 (file)
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -141,6 +141,7 @@ static int subflow_check_req(struct request_sock *req,
        struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk_listener);
        struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
        struct mptcp_options_received mp_opt;
+       bool opt_mp_capable, opt_mp_join;
 
        pr_debug("subflow_req=%p, listener=%p", subflow_req, listener);
 
@@ -154,16 +155,18 @@ static int subflow_check_req(struct request_sock *req,
 
        mptcp_get_options(sk_listener, skb, &mp_opt);
 
-       if (mp_opt.mp_capable) {
+       opt_mp_capable = !!(mp_opt.suboptions & OPTIONS_MPTCP_MPC);
+       opt_mp_join = !!(mp_opt.suboptions & OPTIONS_MPTCP_MPJ);
+       if (opt_mp_capable) {
                SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_MPCAPABLEPASSIVE);
 
-               if (mp_opt.mp_join)
+               if (opt_mp_join)
                        return 0;
-       } else if (mp_opt.mp_join) {
+       } else if (opt_mp_join) {
                SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINSYNRX);
        }
 
-       if (mp_opt.mp_capable && listener->request_mptcp) {
+       if (opt_mp_capable && listener->request_mptcp) {
                int err, retries = MPTCP_TOKEN_MAX_RETRIES;
 
                subflow_req->ssn_offset = TCP_SKB_CB(skb)->seq;
@@ -194,7 +197,7 @@ again:
                else
                        SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_TOKENFALLBACKINIT);
 
-       } else if (mp_opt.mp_join && listener->request_mptcp) {
+       } else if (opt_mp_join && listener->request_mptcp) {
                subflow_req->ssn_offset = TCP_SKB_CB(skb)->seq;
                subflow_req->mp_join = 1;
                subflow_req->backup = mp_opt.backup;
@@ -243,15 +246,18 @@ int mptcp_subflow_init_cookie_req(struct request_sock *req,
        struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk_listener);
        struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
        struct mptcp_options_received mp_opt;
+       bool opt_mp_capable, opt_mp_join;
        int err;
 
        subflow_init_req(req, sk_listener);
        mptcp_get_options(sk_listener, skb, &mp_opt);
 
-       if (mp_opt.mp_capable && mp_opt.mp_join)
+       opt_mp_capable = !!(mp_opt.suboptions & OPTIONS_MPTCP_MPC);
+       opt_mp_join = !!(mp_opt.suboptions & OPTIONS_MPTCP_MPJ);
+       if (opt_mp_capable && opt_mp_join)
                return -EINVAL;
 
-       if (mp_opt.mp_capable && listener->request_mptcp) {
+       if (opt_mp_capable && listener->request_mptcp) {
                if (mp_opt.sndr_key == 0)
                        return -EINVAL;
 
@@ -262,7 +268,7 @@ int mptcp_subflow_init_cookie_req(struct request_sock *req,
 
                subflow_req->mp_capable = 1;
                subflow_req->ssn_offset = TCP_SKB_CB(skb)->seq - 1;
-       } else if (mp_opt.mp_join && listener->request_mptcp) {
+       } else if (opt_mp_join && listener->request_mptcp) {
                if (!mptcp_token_join_cookie_init_state(subflow_req, skb))
                        return -EINVAL;
 
@@ -394,7 +400,6 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 
        subflow->icsk_af_ops->sk_rx_dst_set(sk, skb);
 
-
        /* be sure no special action on any packet other than syn-ack */
        if (subflow->conn_finished)
                return;
@@ -407,7 +412,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 
        mptcp_get_options(sk, skb, &mp_opt);
        if (subflow->request_mptcp) {
-               if (!mp_opt.mp_capable) {
+               if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPC)) {
                        MPTCP_INC_STATS(sock_net(sk),
                                        MPTCP_MIB_MPCAPABLEACTIVEFALLBACK);
                        mptcp_do_fallback(sk);
@@ -415,7 +420,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
                        goto fallback;
                }
 
-               if (mp_opt.csum_reqd)
+               if (mp_opt.suboptions & OPTION_MPTCP_CSUMREQD)
                        WRITE_ONCE(mptcp_sk(parent)->csum_enabled, true);
                if (mp_opt.deny_join_id0)
                        WRITE_ONCE(mptcp_sk(parent)->pm.remote_deny_join_id0, true);
@@ -430,7 +435,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
        } else if (subflow->request_join) {
                u8 hmac[SHA256_DIGEST_SIZE];
 
-               if (!mp_opt.mp_join) {
+               if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPJ)) {
                        subflow->reset_reason = MPTCP_RST_EMPTCP;
                        goto do_reset;
                }
@@ -636,10 +641,10 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
 
        pr_debug("listener=%p, req=%p, conn=%p", listener, req, listener->conn);
 
-       /* After child creation we must look for 'mp_capable' even when options
+       /* After child creation we must look for MPC even when options
         * are not parsed
         */
-       mp_opt.mp_capable = 0;
+       mp_opt.suboptions = 0;
 
        /* hopefully temporary handling for MP_JOIN+syncookie */
        subflow_req = mptcp_subflow_rsk(req);
@@ -659,7 +664,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
                 * options.
                 */
                mptcp_get_options(sk, skb, &mp_opt);
-               if (!mp_opt.mp_capable) {
+               if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPC)) {
                        fallback = true;
                        goto create_child;
                }
@@ -669,7 +674,8 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
                        fallback = true;
        } else if (subflow_req->mp_join) {
                mptcp_get_options(sk, skb, &mp_opt);
-               if (!mp_opt.mp_join || !subflow_hmac_valid(req, &mp_opt) ||
+               if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPJ) ||
+                   !subflow_hmac_valid(req, &mp_opt) ||
                    !mptcp_can_accept_new_subflow(subflow_req->msk)) {
                        SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINACKMAC);
                        fallback = true;
@@ -726,7 +732,7 @@ create_child:
                        /* with OoO packets we can reach here without ingress
                         * mpc option
                         */
-                       if (mp_opt.mp_capable)
+                       if (mp_opt.suboptions & OPTIONS_MPTCP_MPC)
                                mptcp_subflow_fully_established(ctx, &mp_opt);
                } else if (ctx->mp_join) {
                        struct mptcp_sock *owner;