Merge branch 'mptcp-C-flag-and-fixes'
Mat Martineau says: ==================== mptcp: Connection-time 'C' flag and two fixes Here are six more patches from the MPTCP tree. Most of them add support for the 'C' flag in the MPTCP connection-time option headers. This flag affects how the initial address and port are treated by each peer. Normally one peer may send MP_JOIN requests to the remote address and port that were used when initiating the MPTCP connection. The 'C' bit indicates that MP_JOINs should only be sent to remote addresses that have been advertised with ADD_ADDR. The other two patches are unrelated improvements. Patches 1-4: Add the 'C' flag feature, a sysctl to optionally enable it, and a selftest. Patch 5: Adjust rp_filter settings in a selftest. Patch 6: Improve rbuf cleanup for MPTCP sockets. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
Коммит
38f75922a6
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@ -32,3 +32,16 @@ checksum_enabled - BOOLEAN
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per-namespace sysctl.
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Default: 0
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allow_join_initial_addr_port - BOOLEAN
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Allow peers to send join requests to the IP address and port number used
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by the initial subflow if the value is 1. This controls a flag that is
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sent to the peer at connection time, and whether such join requests are
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accepted or denied.
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Joins to addresses advertised with ADD_ADDR are not affected by this
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value.
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This is a per-namespace sysctl.
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Default: 1
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@ -67,7 +67,8 @@ struct mptcp_out_options {
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u8 backup;
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u8 reset_reason:4,
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reset_transient:1,
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csum_reqd:1;
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csum_reqd:1,
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allow_join_id0:1;
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u32 nonce;
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u64 thmac;
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u32 token;
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@ -24,6 +24,7 @@ struct mptcp_pernet {
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u8 mptcp_enabled;
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unsigned int add_addr_timeout;
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u8 checksum_enabled;
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u8 allow_join_initial_addr_port;
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};
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static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
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@ -46,11 +47,17 @@ int mptcp_is_checksum_enabled(struct net *net)
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return mptcp_get_pernet(net)->checksum_enabled;
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}
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int mptcp_allow_join_id0(struct net *net)
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{
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return mptcp_get_pernet(net)->allow_join_initial_addr_port;
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}
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static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
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{
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pernet->mptcp_enabled = 1;
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pernet->add_addr_timeout = TCP_RTO_MAX;
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pernet->checksum_enabled = 0;
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pernet->allow_join_initial_addr_port = 1;
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}
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#ifdef CONFIG_SYSCTL
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@ -80,6 +87,14 @@ static struct ctl_table mptcp_sysctl_table[] = {
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE
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},
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{
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.procname = "allow_join_initial_addr_port",
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE
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},
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{}
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};
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@ -98,6 +113,7 @@ static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
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table[0].data = &pernet->mptcp_enabled;
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table[1].data = &pernet->add_addr_timeout;
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table[2].data = &pernet->checksum_enabled;
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table[3].data = &pernet->allow_join_initial_addr_port;
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hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
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if (!hdr)
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@ -83,6 +83,9 @@ static void mptcp_parse_option(const struct sk_buff *skb,
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if (flags & MPTCP_CAP_CHECKSUM_REQD)
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mp_opt->csum_reqd = 1;
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if (flags & MPTCP_CAP_DENY_JOIN_ID0)
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mp_opt->deny_join_id0 = 1;
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mp_opt->mp_capable = 1;
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if (opsize >= TCPOLEN_MPTCP_MPC_SYNACK) {
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mp_opt->sndr_key = get_unaligned_be64(ptr);
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@ -360,6 +363,7 @@ void mptcp_get_options(const struct sock *sk,
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mp_opt->mp_prio = 0;
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mp_opt->reset = 0;
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mp_opt->csum_reqd = READ_ONCE(msk->csum_enabled);
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mp_opt->deny_join_id0 = 0;
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length = (th->doff * 4) - sizeof(struct tcphdr);
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ptr = (const unsigned char *)(th + 1);
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@ -402,6 +406,7 @@ bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
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if (subflow->request_mptcp) {
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opts->suboptions = OPTION_MPTCP_MPC_SYN;
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opts->csum_reqd = mptcp_is_checksum_enabled(sock_net(sk));
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opts->allow_join_id0 = mptcp_allow_join_id0(sock_net(sk));
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*size = TCPOLEN_MPTCP_MPC_SYN;
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return true;
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} else if (subflow->request_join) {
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@ -490,6 +495,7 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
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opts->sndr_key = subflow->local_key;
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opts->rcvr_key = subflow->remote_key;
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opts->csum_reqd = READ_ONCE(msk->csum_enabled);
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opts->allow_join_id0 = mptcp_allow_join_id0(sock_net(sk));
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/* Section 3.1.
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* The MP_CAPABLE option is carried on the SYN, SYN/ACK, and ACK
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@ -827,6 +833,7 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
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opts->suboptions = OPTION_MPTCP_MPC_SYNACK;
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opts->sndr_key = subflow_req->local_key;
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opts->csum_reqd = subflow_req->csum_reqd;
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opts->allow_join_id0 = subflow_req->allow_join_id0;
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*size = TCPOLEN_MPTCP_MPC_SYNACK;
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pr_debug("subflow_req=%p, local_key=%llu",
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subflow_req, subflow_req->local_key);
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@ -905,6 +912,9 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
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return false;
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}
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if (mp_opt->deny_join_id0)
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WRITE_ONCE(msk->pm.remote_deny_join_id0, true);
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if (unlikely(!READ_ONCE(msk->pm.server_side)))
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pr_warn_once("bogus mpc option on established client sk");
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mptcp_subflow_fully_established(subflow, mp_opt);
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@ -1201,6 +1211,9 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
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if (opts->csum_reqd)
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flag |= MPTCP_CAP_CHECKSUM_REQD;
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if (!opts->allow_join_id0)
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flag |= MPTCP_CAP_DENY_JOIN_ID0;
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*ptr++ = mptcp_option(MPTCPOPT_MP_CAPABLE, len,
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MPTCP_SUPPORTED_VERSION,
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flag);
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@ -320,6 +320,7 @@ void mptcp_pm_data_init(struct mptcp_sock *msk)
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WRITE_ONCE(msk->pm.addr_signal, 0);
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WRITE_ONCE(msk->pm.accept_addr, false);
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WRITE_ONCE(msk->pm.accept_subflow, false);
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WRITE_ONCE(msk->pm.remote_deny_join_id0, false);
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msk->pm.status = 0;
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spin_lock_init(&msk->pm.lock);
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@ -451,7 +451,8 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
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/* check if should create a new subflow */
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if (msk->pm.local_addr_used < local_addr_max &&
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msk->pm.subflows < subflows_max) {
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msk->pm.subflows < subflows_max &&
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!READ_ONCE(msk->pm.remote_deny_join_id0)) {
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local = select_local_address(pernet, msk);
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if (local) {
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struct mptcp_addr_info remote = { 0 };
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@ -442,49 +442,46 @@ static void mptcp_send_ack(struct mptcp_sock *msk)
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}
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}
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static bool mptcp_subflow_cleanup_rbuf(struct sock *ssk)
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static void mptcp_subflow_cleanup_rbuf(struct sock *ssk)
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{
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bool slow;
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int ret;
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slow = lock_sock_fast(ssk);
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ret = tcp_can_send_ack(ssk);
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if (ret)
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if (tcp_can_send_ack(ssk))
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tcp_cleanup_rbuf(ssk, 1);
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unlock_sock_fast(ssk, slow);
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return ret;
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}
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static bool mptcp_subflow_could_cleanup(const struct sock *ssk, bool rx_empty)
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{
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const struct inet_connection_sock *icsk = inet_csk(ssk);
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bool ack_pending = READ_ONCE(icsk->icsk_ack.pending);
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const struct tcp_sock *tp = tcp_sk(ssk);
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return (ack_pending & ICSK_ACK_SCHED) &&
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((READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->rcv_wup) >
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READ_ONCE(icsk->icsk_ack.rcv_mss)) ||
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(rx_empty && ack_pending &
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(ICSK_ACK_PUSHED2 | ICSK_ACK_PUSHED)));
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}
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static void mptcp_cleanup_rbuf(struct mptcp_sock *msk)
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{
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struct sock *ack_hint = READ_ONCE(msk->ack_hint);
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int old_space = READ_ONCE(msk->old_wspace);
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struct mptcp_subflow_context *subflow;
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struct sock *sk = (struct sock *)msk;
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bool cleanup;
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int space = __mptcp_space(sk);
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bool cleanup, rx_empty;
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/* this is a simple superset of what tcp_cleanup_rbuf() implements
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* so that we don't have to acquire the ssk socket lock most of the time
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* to do actually nothing
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*/
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cleanup = __mptcp_space(sk) - old_space >= max(0, old_space);
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if (!cleanup)
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return;
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cleanup = (space > 0) && (space >= (old_space << 1));
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rx_empty = !atomic_read(&sk->sk_rmem_alloc);
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/* if the hinted ssk is still active, try to use it */
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if (likely(ack_hint)) {
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mptcp_for_each_subflow(msk, subflow) {
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struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
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mptcp_for_each_subflow(msk, subflow) {
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struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
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if (ack_hint == ssk && mptcp_subflow_cleanup_rbuf(ssk))
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return;
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}
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if (cleanup || mptcp_subflow_could_cleanup(ssk, rx_empty))
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mptcp_subflow_cleanup_rbuf(ssk);
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}
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/* otherwise pick the first active subflow */
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mptcp_for_each_subflow(msk, subflow)
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if (mptcp_subflow_cleanup_rbuf(mptcp_subflow_tcp_sock(subflow)))
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return;
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}
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static bool mptcp_check_data_fin(struct sock *sk)
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@ -629,7 +626,6 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
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break;
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}
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} while (more_data_avail);
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WRITE_ONCE(msk->ack_hint, ssk);
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*bytes += moved;
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return done;
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@ -1910,7 +1906,6 @@ static bool __mptcp_move_skbs(struct mptcp_sock *msk)
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__mptcp_update_rmem(sk);
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done = __mptcp_move_skbs_from_subflow(msk, ssk, &moved);
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mptcp_data_unlock(sk);
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tcp_cleanup_rbuf(ssk, moved);
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if (unlikely(ssk->sk_err))
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__mptcp_error_report(sk);
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@ -1926,7 +1921,6 @@ static bool __mptcp_move_skbs(struct mptcp_sock *msk)
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ret |= __mptcp_ofo_queue(msk);
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__mptcp_splice_receive_queue(sk);
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mptcp_data_unlock(sk);
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mptcp_cleanup_rbuf(msk);
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}
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if (ret)
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mptcp_check_data_fin((struct sock *)msk);
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@ -2175,9 +2169,6 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
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if (ssk == msk->last_snd)
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msk->last_snd = NULL;
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if (ssk == msk->ack_hint)
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msk->ack_hint = NULL;
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if (ssk == msk->first)
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msk->first = NULL;
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@ -2392,7 +2383,6 @@ static int __mptcp_init_sock(struct sock *sk)
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msk->rmem_released = 0;
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msk->tx_pending_data = 0;
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msk->ack_hint = NULL;
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msk->first = NULL;
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inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss;
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WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk)));
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@ -79,8 +79,9 @@
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#define MPTCP_VERSION_MASK (0x0F)
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#define MPTCP_CAP_CHECKSUM_REQD BIT(7)
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#define MPTCP_CAP_EXTENSIBILITY BIT(6)
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#define MPTCP_CAP_DENY_JOIN_ID0 BIT(5)
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#define MPTCP_CAP_HMAC_SHA256 BIT(0)
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#define MPTCP_CAP_FLAG_MASK (0x3F)
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#define MPTCP_CAP_FLAG_MASK (0x1F)
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/* MPTCP DSS flags */
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#define MPTCP_DSS_DATA_FIN BIT(4)
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@ -137,7 +138,8 @@ struct mptcp_options_received {
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mp_prio : 1,
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echo : 1,
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csum_reqd : 1,
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backup : 1;
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backup : 1,
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deny_join_id0 : 1;
|
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u32 token;
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u32 nonce;
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u64 thmac;
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|
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@ -192,6 +194,7 @@ struct mptcp_pm_data {
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bool work_pending;
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bool accept_addr;
|
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bool accept_subflow;
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bool remote_deny_join_id0;
|
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u8 add_addr_signaled;
|
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u8 add_addr_accepted;
|
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u8 local_addr_used;
|
||||
|
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@ -240,7 +243,6 @@ struct mptcp_sock {
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bool use_64bit_ack; /* Set when we received a 64-bit DSN */
|
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bool csum_enabled;
|
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spinlock_t join_list_lock;
|
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struct sock *ack_hint;
|
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struct work_struct work;
|
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struct sk_buff *ooo_last_skb;
|
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struct rb_root out_of_order_queue;
|
||||
|
|
@ -350,7 +352,8 @@ struct mptcp_subflow_request_sock {
|
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u16 mp_capable : 1,
|
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mp_join : 1,
|
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backup : 1,
|
||||
csum_reqd : 1;
|
||||
csum_reqd : 1,
|
||||
allow_join_id0 : 1;
|
||||
u8 local_id;
|
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u8 remote_id;
|
||||
u64 local_key;
|
||||
|
|
@ -540,6 +543,7 @@ static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *su
|
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int mptcp_is_enabled(struct net *net);
|
||||
unsigned int mptcp_get_add_addr_timeout(struct net *net);
|
||||
int mptcp_is_checksum_enabled(struct net *net);
|
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int mptcp_allow_join_id0(struct net *net);
|
||||
void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
|
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struct mptcp_options_received *mp_opt);
|
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bool mptcp_subflow_data_available(struct sock *sk);
|
||||
|
|
|
|||
|
|
@ -109,6 +109,7 @@ static void subflow_init_req(struct request_sock *req, const struct sock *sk_lis
|
|||
subflow_req->mp_capable = 0;
|
||||
subflow_req->mp_join = 0;
|
||||
subflow_req->csum_reqd = mptcp_is_checksum_enabled(sock_net(sk_listener));
|
||||
subflow_req->allow_join_id0 = mptcp_allow_join_id0(sock_net(sk_listener));
|
||||
subflow_req->msk = NULL;
|
||||
mptcp_token_init_request(req);
|
||||
}
|
||||
|
|
@ -407,6 +408,8 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
|
|||
|
||||
if (mp_opt.csum_reqd)
|
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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);
|
||||
subflow->mp_capable = 1;
|
||||
subflow->can_ack = 1;
|
||||
subflow->remote_key = mp_opt.sndr_key;
|
||||
|
|
|
|||
|
|
@ -139,6 +139,17 @@ reset_with_checksum()
|
|||
ip netns exec $ns2 sysctl -q net.mptcp.checksum_enabled=$ns2_enable
|
||||
}
|
||||
|
||||
reset_with_allow_join_id0()
|
||||
{
|
||||
local ns1_enable=$1
|
||||
local ns2_enable=$2
|
||||
|
||||
reset
|
||||
|
||||
ip netns exec $ns1 sysctl -q net.mptcp.allow_join_initial_addr_port=$ns1_enable
|
||||
ip netns exec $ns2 sysctl -q net.mptcp.allow_join_initial_addr_port=$ns2_enable
|
||||
}
|
||||
|
||||
ip -Version > /dev/null 2>&1
|
||||
if [ $? -ne 0 ];then
|
||||
echo "SKIP: Could not run test without ip tool"
|
||||
|
|
@ -1462,6 +1473,63 @@ checksum_tests()
|
|||
chk_csum_nr "checksum test 1 0"
|
||||
}
|
||||
|
||||
deny_join_id0_tests()
|
||||
{
|
||||
# subflow allow join id0 ns1
|
||||
reset_with_allow_join_id0 1 0
|
||||
ip netns exec $ns1 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns2 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow
|
||||
run_tests $ns1 $ns2 10.0.1.1
|
||||
chk_join_nr "single subflow allow join id0 ns1" 1 1 1
|
||||
|
||||
# subflow allow join id0 ns2
|
||||
reset_with_allow_join_id0 0 1
|
||||
ip netns exec $ns1 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns2 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow
|
||||
run_tests $ns1 $ns2 10.0.1.1
|
||||
chk_join_nr "single subflow allow join id0 ns2" 0 0 0
|
||||
|
||||
# signal address allow join id0 ns1
|
||||
# ADD_ADDRs are not affected by allow_join_id0 value.
|
||||
reset_with_allow_join_id0 1 0
|
||||
ip netns exec $ns1 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns2 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns1 ./pm_nl_ctl add 10.0.2.1 flags signal
|
||||
run_tests $ns1 $ns2 10.0.1.1
|
||||
chk_join_nr "signal address allow join id0 ns1" 1 1 1
|
||||
chk_add_nr 1 1
|
||||
|
||||
# signal address allow join id0 ns2
|
||||
# ADD_ADDRs are not affected by allow_join_id0 value.
|
||||
reset_with_allow_join_id0 0 1
|
||||
ip netns exec $ns1 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns2 ./pm_nl_ctl limits 1 1
|
||||
ip netns exec $ns1 ./pm_nl_ctl add 10.0.2.1 flags signal
|
||||
run_tests $ns1 $ns2 10.0.1.1
|
||||
chk_join_nr "signal address allow join id0 ns2" 1 1 1
|
||||
chk_add_nr 1 1
|
||||
|
||||
# subflow and address allow join id0 ns1
|
||||
reset_with_allow_join_id0 1 0
|
||||
ip netns exec $ns1 ./pm_nl_ctl limits 2 2
|
||||
ip netns exec $ns2 ./pm_nl_ctl limits 2 2
|
||||
ip netns exec $ns1 ./pm_nl_ctl add 10.0.2.1 flags signal
|
||||
ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow
|
||||
run_tests $ns1 $ns2 10.0.1.1
|
||||
chk_join_nr "subflow and address allow join id0 1" 2 2 2
|
||||
|
||||
# subflow and address allow join id0 ns2
|
||||
reset_with_allow_join_id0 0 1
|
||||
ip netns exec $ns1 ./pm_nl_ctl limits 2 2
|
||||
ip netns exec $ns2 ./pm_nl_ctl limits 2 2
|
||||
ip netns exec $ns1 ./pm_nl_ctl add 10.0.2.1 flags signal
|
||||
ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow
|
||||
run_tests $ns1 $ns2 10.0.1.1
|
||||
chk_join_nr "subflow and address allow join id0 2" 1 1 1
|
||||
}
|
||||
|
||||
all_tests()
|
||||
{
|
||||
subflows_tests
|
||||
|
|
@ -1476,6 +1544,7 @@ all_tests()
|
|||
add_addr_ports_tests
|
||||
syncookies_tests
|
||||
checksum_tests
|
||||
deny_join_id0_tests
|
||||
}
|
||||
|
||||
usage()
|
||||
|
|
@ -1493,6 +1562,7 @@ usage()
|
|||
echo " -p add_addr_ports_tests"
|
||||
echo " -k syncookies_tests"
|
||||
echo " -S checksum_tests"
|
||||
echo " -d deny_join_id0_tests"
|
||||
echo " -c capture pcap files"
|
||||
echo " -C enable data checksum"
|
||||
echo " -h help"
|
||||
|
|
@ -1528,7 +1598,7 @@ if [ $do_all_tests -eq 1 ]; then
|
|||
exit $ret
|
||||
fi
|
||||
|
||||
while getopts 'fsltra64bpkchCS' opt; do
|
||||
while getopts 'fsltra64bpkdchCS' opt; do
|
||||
case $opt in
|
||||
f)
|
||||
subflows_tests
|
||||
|
|
@ -1566,6 +1636,9 @@ while getopts 'fsltra64bpkchCS' opt; do
|
|||
S)
|
||||
checksum_tests
|
||||
;;
|
||||
d)
|
||||
deny_join_id0_tests
|
||||
;;
|
||||
c)
|
||||
;;
|
||||
C)
|
||||
|
|
|
|||
|
|
@ -60,6 +60,8 @@ setup()
|
|||
for i in "$ns1" "$ns2" "$ns3";do
|
||||
ip netns add $i || exit $ksft_skip
|
||||
ip -net $i link set lo up
|
||||
ip netns exec $i sysctl -q net.ipv4.conf.all.rp_filter=0
|
||||
ip netns exec $i sysctl -q net.ipv4.conf.default.rp_filter=0
|
||||
done
|
||||
|
||||
ip link add ns1eth1 netns "$ns1" type veth peer name ns2eth1 netns "$ns2"
|
||||
|
|
@ -80,7 +82,6 @@ setup()
|
|||
|
||||
ip netns exec "$ns1" ./pm_nl_ctl limits 1 1
|
||||
ip netns exec "$ns1" ./pm_nl_ctl add 10.0.2.1 dev ns1eth2 flags subflow
|
||||
ip netns exec "$ns1" sysctl -q net.ipv4.conf.all.rp_filter=0
|
||||
|
||||
ip -net "$ns2" addr add 10.0.1.2/24 dev ns2eth1
|
||||
ip -net "$ns2" addr add dead:beef:1::2/64 dev ns2eth1 nodad
|
||||
|
|
|
|||
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