* 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;
- if (flags & MPTCP_CAP_DENY_JOIN_ID0)
- mp_opt->deny_join_id0 = 1;
+ 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;
* 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);
}
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",
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++;
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;
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);
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;
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;
if (mp_opt->addr.family == AF_INET) {
memcpy((u8 *)&mp_opt->addr.addr.s_addr, (u8 *)ptr, 4);
ptr += 4;
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++;
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;
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:
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;
break;
+ case MPTCPOPT_MP_FAIL:
+ if (opsize != TCPOLEN_MPTCP_FAIL)
+ break;
+
+ ptr += 2;
+ 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;
+
default:
break;
}
const struct sk_buff *skb,
struct mptcp_options_received *mp_opt)
{
- struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
- struct mptcp_sock *msk = mptcp_sk(subflow->conn);
const struct tcphdr *th = tcp_hdr(skb);
const unsigned char *ptr;
int length;
/* initialize option status */
- mp_opt->mp_capable = 0;
- mp_opt->mp_join = 0;
- mp_opt->add_addr = 0;
- mp_opt->ahmac = 0;
- mp_opt->fastclose = 0;
- mp_opt->addr.port = 0;
- mp_opt->rm_addr = 0;
- mp_opt->dss = 0;
- mp_opt->mp_prio = 0;
- mp_opt->reset = 0;
- mp_opt->csum_reqd = READ_ONCE(msk->csum_enabled);
- mp_opt->deny_join_id0 = 0;
+ mp_opt->suboptions = 0;
length = (th->doff * 4) - sizeof(struct tcphdr);
ptr = (const unsigned char *)(th + 1);
dss_size = map_size;
if (skb && snd_data_fin_enable)
mptcp_write_data_fin(subflow, skb, &opts->ext_copy);
+ opts->suboptions = OPTION_MPTCP_DSS;
ret = true;
}
opts->ext_copy.ack64 = 0;
}
opts->ext_copy.use_ack = 1;
+ opts->suboptions = OPTION_MPTCP_DSS;
WRITE_ONCE(msk->old_wspace, __mptcp_space((struct sock *)msk));
/* Add kind/length/subtype/flag overhead if mapping is not populated */
bool port;
int len;
- if ((mptcp_pm_should_add_signal_ipv6(msk) ||
- mptcp_pm_should_add_signal_port(msk) ||
- mptcp_pm_should_add_signal_echo(msk)) &&
- skb && skb_is_tcp_pure_ack(skb)) {
- pr_debug("drop other suboptions");
- opts->suboptions = 0;
- opts->ext_copy.use_ack = 0;
- opts->ext_copy.use_map = 0;
- remaining += opt_size;
- drop_other_suboptions = true;
- }
-
+ /* add addr will strip the existing options, be sure to avoid breaking
+ * MPC/MPJ handshakes
+ */
if (!mptcp_pm_should_add_signal(msk) ||
- !(mptcp_pm_add_addr_signal(msk, remaining, &opts->addr, &echo, &port)))
+ (opts->suboptions & (OPTION_MPTCP_MPJ_ACK | OPTION_MPTCP_MPC_ACK)) ||
+ !mptcp_pm_add_addr_signal(msk, skb, opt_size, remaining, &opts->addr,
+ &echo, &port, &drop_other_suboptions))
return false;
+ if (drop_other_suboptions)
+ remaining += opt_size;
len = mptcp_add_addr_len(opts->addr.family, echo, port);
if (remaining < len)
return false;
*size = len;
- if (drop_other_suboptions)
+ if (drop_other_suboptions) {
+ pr_debug("drop other suboptions");
+ opts->suboptions = 0;
+
+ /* note that e.g. DSS could have written into the memory
+ * aliased by ahmac, we must reset the field here
+ * to avoid appending the hmac even for ADD_ADDR echo
+ * options
+ */
+ opts->ahmac = 0;
*size -= opt_size;
+ }
opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
if (!echo) {
opts->ahmac = add_addr_generate_hmac(msk->local_key,
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
- if (!subflow->send_mp_prio)
+ /* can't send MP_PRIO with MPC, as they share the same option space:
+ * 'backup'. Also it makes no sense at all
+ */
+ if (!subflow->send_mp_prio ||
+ ((OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK |
+ OPTION_MPTCP_MPC_ACK) & opts->suboptions))
return false;
/* account for the trailing 'nop' option */
return true;
}
-static noinline void mptcp_established_options_rst(struct sock *sk, struct sk_buff *skb,
+static noinline bool mptcp_established_options_rst(struct sock *sk, struct sk_buff *skb,
unsigned int *size,
unsigned int remaining,
struct mptcp_out_options *opts)
const struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
if (remaining < TCPOLEN_MPTCP_RST)
- return;
+ return false;
*size = TCPOLEN_MPTCP_RST;
opts->suboptions |= OPTION_MPTCP_RST;
opts->reset_transient = subflow->reset_transient;
opts->reset_reason = subflow->reset_reason;
+
+ return true;
+}
+
+static bool mptcp_established_options_mp_fail(struct sock *sk,
+ unsigned int *size,
+ unsigned int remaining,
+ struct mptcp_out_options *opts)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+
+ if (likely(!subflow->send_mp_fail))
+ return false;
+
+ if (remaining < TCPOLEN_MPTCP_FAIL)
+ return false;
+
+ *size = TCPOLEN_MPTCP_FAIL;
+ opts->suboptions |= OPTION_MPTCP_FAIL;
+ opts->fail_seq = subflow->map_seq;
+
+ pr_debug("MP_FAIL fail_seq=%llu", opts->fail_seq);
+
+ return true;
}
bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
return false;
if (unlikely(skb && TCP_SKB_CB(skb)->tcp_flags & TCPHDR_RST)) {
- mptcp_established_options_rst(sk, skb, size, remaining, opts);
+ if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
+ *size += opt_size;
+ remaining -= opt_size;
+ }
+ if (mptcp_established_options_rst(sk, skb, &opt_size, remaining, opts)) {
+ *size += opt_size;
+ remaining -= opt_size;
+ }
return true;
}
snd_data_fin = mptcp_data_fin_enabled(msk);
if (mptcp_established_options_mp(sk, skb, snd_data_fin, &opt_size, remaining, opts))
ret = true;
- else if (mptcp_established_options_dss(sk, skb, snd_data_fin, &opt_size, remaining, opts))
+ else if (mptcp_established_options_dss(sk, skb, snd_data_fin, &opt_size, remaining, opts)) {
ret = true;
+ if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
+ *size += opt_size;
+ remaining -= opt_size;
+ return true;
+ }
+ }
/* we reserved enough space for the above options, and exceeding the
* TCP option space would be fatal
*/
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;
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.
*/
* 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;
old_snd_una = msk->snd_una;
new_snd_una = mptcp_expand_seq(old_snd_una, mp_opt->data_ack, mp_opt->ack64);
- /* ACK for data not even sent yet? Ignore. */
- if (after64(new_snd_una, snd_nxt))
- new_snd_una = old_snd_una;
+ /* ACK for data not even sent yet and even above recovery bound? Ignore.*/
+ if (unlikely(after64(new_snd_una, snd_nxt))) {
+ if (!msk->recovery || after64(new_snd_una, msk->recovery_snd_nxt))
+ new_snd_una = old_snd_una;
+ }
new_wnd_end = new_snd_una + tcp_sk(ssk)->snd_wnd;
if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))
return sk->sk_state != TCP_CLOSE;
- if (mp_opt.fastclose &&
- msk->local_key == mp_opt.rcvr_key) {
- WRITE_ONCE(msk->rcv_fastclose, true);
- mptcp_schedule_work((struct sock *)msk);
- }
+ if (unlikely(mp_opt.suboptions != OPTION_MPTCP_DSS)) {
+ 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.echo) {
- mptcp_pm_add_addr_received(msk, &mp_opt.addr);
- MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR);
- } else {
- mptcp_pm_add_addr_echoed(msk, &mp_opt.addr);
- mptcp_pm_del_add_timer(msk, &mp_opt.addr, true);
- MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD);
+ 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);
+ } else {
+ mptcp_pm_add_addr_echoed(msk, &mp_opt.addr);
+ mptcp_pm_del_add_timer(msk, &mp_opt.addr, true);
+ MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD);
+ }
+
+ if (mp_opt.addr.port)
+ MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_PORTADD);
}
- if (mp_opt.addr.port)
- MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_PORTADD);
+ if (mp_opt.suboptions & OPTION_MPTCP_RM_ADDR)
+ mptcp_pm_rm_addr_received(msk, &mp_opt.rm_list);
- mp_opt.add_addr = 0;
- }
+ 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);
+ }
- if (mp_opt.rm_addr) {
- mptcp_pm_rm_addr_received(msk, &mp_opt.rm_list);
- mp_opt.rm_addr = 0;
- }
+ 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);
+ }
- if (mp_opt.mp_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.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.reset) {
- subflow->reset_seen = 1;
- subflow->reset_reason = mp_opt.reset_reason;
- subflow->reset_transient = mp_opt.reset_transient;
+ if (!(mp_opt.suboptions & OPTION_MPTCP_DSS))
+ return true;
}
- if (!mp_opt.dss)
- return true;
-
/* we can't wait for recvmsg() to update the ack_seq, otherwise
* monodirectional flows will stuck
*/
memset(mpext, 0, sizeof(*mpext));
- if (mp_opt.use_map) {
+ if (likely(mp_opt.use_map)) {
if (mp_opt.mpc_map) {
/* this is an MP_CAPABLE carrying MPTCP data
* we know this map the first chunk of data
}
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;
void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
struct mptcp_out_options *opts)
{
- if ((OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK |
- OPTION_MPTCP_MPC_ACK) & opts->suboptions) {
+ if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions)) {
+ const struct sock *ssk = (const struct sock *)tp;
+ struct mptcp_subflow_context *subflow;
+
+ subflow = mptcp_subflow_ctx(ssk);
+ subflow->send_mp_fail = 0;
+
+ *ptr++ = mptcp_option(MPTCPOPT_MP_FAIL,
+ TCPOLEN_MPTCP_FAIL,
+ 0, 0);
+ put_unaligned_be64(opts->fail_seq, ptr);
+ ptr += 2;
+ }
+
+ /* RST is mutually exclusive with everything else */
+ if (unlikely(OPTION_MPTCP_RST & opts->suboptions)) {
+ *ptr++ = mptcp_option(MPTCPOPT_RST,
+ TCPOLEN_MPTCP_RST,
+ opts->reset_transient,
+ opts->reset_reason);
+ return;
+ }
+
+ /* DSS, MPC, MPJ and ADD_ADDR are mutually exclusive, see
+ * mptcp_established_options*()
+ */
+ if (likely(OPTION_MPTCP_DSS & opts->suboptions)) {
+ struct mptcp_ext *mpext = &opts->ext_copy;
+ u8 len = TCPOLEN_MPTCP_DSS_BASE;
+ u8 flags = 0;
+
+ if (mpext->use_ack) {
+ flags = MPTCP_DSS_HAS_ACK;
+ if (mpext->ack64) {
+ len += TCPOLEN_MPTCP_DSS_ACK64;
+ flags |= MPTCP_DSS_ACK64;
+ } else {
+ len += TCPOLEN_MPTCP_DSS_ACK32;
+ }
+ }
+
+ if (mpext->use_map) {
+ len += TCPOLEN_MPTCP_DSS_MAP64;
+
+ /* Use only 64-bit mapping flags for now, add
+ * support for optional 32-bit mappings later.
+ */
+ flags |= MPTCP_DSS_HAS_MAP | MPTCP_DSS_DSN64;
+ if (mpext->data_fin)
+ flags |= MPTCP_DSS_DATA_FIN;
+
+ if (opts->csum_reqd)
+ len += TCPOLEN_MPTCP_DSS_CHECKSUM;
+ }
+
+ *ptr++ = mptcp_option(MPTCPOPT_DSS, len, 0, flags);
+
+ if (mpext->use_ack) {
+ if (mpext->ack64) {
+ put_unaligned_be64(mpext->data_ack, ptr);
+ ptr += 2;
+ } else {
+ put_unaligned_be32(mpext->data_ack32, ptr);
+ ptr += 1;
+ }
+ }
+
+ if (mpext->use_map) {
+ put_unaligned_be64(mpext->data_seq, ptr);
+ ptr += 2;
+ put_unaligned_be32(mpext->subflow_seq, ptr);
+ ptr += 1;
+ if (opts->csum_reqd) {
+ put_unaligned_be32(mpext->data_len << 16 |
+ mptcp_make_csum(mpext), ptr);
+ } else {
+ put_unaligned_be32(mpext->data_len << 16 |
+ TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
+ }
+ }
+ } else if ((OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK |
+ OPTION_MPTCP_MPC_ACK) & opts->suboptions) {
u8 len, flag = MPTCP_CAP_HMAC_SHA256;
if (OPTION_MPTCP_MPC_SYN & opts->suboptions) {
TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
}
ptr += 1;
- }
-mp_capable_done:
- if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {
+ /* MPC is additionally mutually exclusive with MP_PRIO */
+ goto mp_capable_done;
+ } else 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;
+ } else 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;
+ } else 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;
+ } else if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {
u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
u8 echo = MPTCP_ADDR_ECHO;
}
}
+ if (OPTION_MPTCP_PRIO & opts->suboptions) {
+ const struct sock *ssk = (const struct sock *)tp;
+ struct mptcp_subflow_context *subflow;
+
+ subflow = mptcp_subflow_ctx(ssk);
+ subflow->send_mp_prio = 0;
+
+ *ptr++ = mptcp_option(MPTCPOPT_MP_PRIO,
+ TCPOLEN_MPTCP_PRIO,
+ opts->backup, TCPOPT_NOP);
+ }
+
+mp_capable_done:
if (OPTION_MPTCP_RM_ADDR & opts->suboptions) {
u8 i = 1;
}
}
- if (OPTION_MPTCP_PRIO & opts->suboptions) {
- const struct sock *ssk = (const struct sock *)tp;
- struct mptcp_subflow_context *subflow;
-
- subflow = mptcp_subflow_ctx(ssk);
- subflow->send_mp_prio = 0;
-
- *ptr++ = mptcp_option(MPTCPOPT_MP_PRIO,
- TCPOLEN_MPTCP_PRIO,
- opts->backup, TCPOPT_NOP);
- }
-
- 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 (OPTION_MPTCP_RST & opts->suboptions)
- *ptr++ = mptcp_option(MPTCPOPT_RST,
- TCPOLEN_MPTCP_RST,
- opts->reset_transient,
- opts->reset_reason);
-
- if (opts->ext_copy.use_ack || opts->ext_copy.use_map) {
- struct mptcp_ext *mpext = &opts->ext_copy;
- u8 len = TCPOLEN_MPTCP_DSS_BASE;
- u8 flags = 0;
-
- if (mpext->use_ack) {
- flags = MPTCP_DSS_HAS_ACK;
- if (mpext->ack64) {
- len += TCPOLEN_MPTCP_DSS_ACK64;
- flags |= MPTCP_DSS_ACK64;
- } else {
- len += TCPOLEN_MPTCP_DSS_ACK32;
- }
- }
-
- if (mpext->use_map) {
- len += TCPOLEN_MPTCP_DSS_MAP64;
-
- /* Use only 64-bit mapping flags for now, add
- * support for optional 32-bit mappings later.
- */
- flags |= MPTCP_DSS_HAS_MAP | MPTCP_DSS_DSN64;
- if (mpext->data_fin)
- flags |= MPTCP_DSS_DATA_FIN;
-
- if (opts->csum_reqd)
- len += TCPOLEN_MPTCP_DSS_CHECKSUM;
- }
-
- *ptr++ = mptcp_option(MPTCPOPT_DSS, len, 0, flags);
-
- if (mpext->use_ack) {
- if (mpext->ack64) {
- put_unaligned_be64(mpext->data_ack, ptr);
- ptr += 2;
- } else {
- put_unaligned_be32(mpext->data_ack32, ptr);
- ptr += 1;
- }
- }
-
- if (mpext->use_map) {
- put_unaligned_be64(mpext->data_seq, ptr);
- ptr += 2;
- put_unaligned_be32(mpext->subflow_seq, ptr);
- ptr += 1;
- if (opts->csum_reqd) {
- put_unaligned_be32(mpext->data_len << 16 |
- mptcp_make_csum(mpext), ptr);
- } else {
- put_unaligned_be32(mpext->data_len << 16 |
- TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
- }
- }
- }
-
if (tp)
mptcp_set_rwin(tp);
}
projects / linux-2.6-microblaze.git / blobdiff