From: Yonglong Li <liyonglong@chinatelecom.cn>
To: Geliang Tang <geliangtang@gmail.com>
Cc: mptcp@lists.linux.dev,
Mat Martineau <mathew.j.martineau@linux.intel.com>,
qitiepeng@chinatelecom.cn
Subject: Re: [PATCH v4 3/4] mptcp: build ADD_ADDR/echo-ADD_ADDR option according pm.add_signal
Date: Mon, 21 Jun 2021 11:51:52 +0800 [thread overview]
Message-ID: <85720e69-d6d4-4a9b-9f1c-0898a1cf5009@chinatelecom.cn> (raw)
In-Reply-To: <CA+WQbwsSmzxw5c-pPJNYndQ99FKmFXSuKD6kxpQgwJGe9Q2kpQ@mail.gmail.com>
On 2021/6/18 19:20, Geliang Tang wrote:
> Hi Yonglong,
>
> Thanks for v4!
>
> Yonglong Li <liyonglong@chinatelecom.cn> 于2021年6月18日周五 下午4:19写道：
>>
>> according MPTCP_ADD_ADDR_SIGNAL and MPTCP_ADD_ADDR_ECHO flag build
>> ADD_ADDR/echo-ADD_ADDR option
>>
>> add a suboptions type OPTION_MPTCP_ADD_ECHO to mark as echo option
>>
>> Signed-off-by: Yonglong Li <liyonglong@chinatelecom.cn>
>> ---
>> net/mptcp/options.c | 124 +++++++++++++++++++++++++++++++--------------------
>> net/mptcp/pm.c | 30 ++++---------
>> net/mptcp/protocol.h | 13 +++---
>> 3 files changed, 92 insertions(+), 75 deletions(-)
>>
>> diff --git a/net/mptcp/options.c b/net/mptcp/options.c
>> index 1aec016..43e3241 100644
>> --- a/net/mptcp/options.c
>> +++ b/net/mptcp/options.c
>> @@ -655,41 +655,64 @@ static bool mptcp_established_options_add_addr(struct sock *sk, struct sk_buff *
>> struct mptcp_sock *msk = mptcp_sk(subflow->conn);
>> bool drop_other_suboptions = false;
>> unsigned int opt_size = *size;
>> - bool echo;
>> - bool port;
>> + struct mptcp_addr_info remote;
>> + struct mptcp_addr_info local;
>> + u8 add_addr, flags = 0xff;
>> 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;
>> - }
>> -
>> - if (!mptcp_pm_should_add_signal(msk) ||
>> - !(mptcp_pm_add_addr_signal(msk, remaining, &opts->addr, &echo, &port)))
>> - return false;
>> -
>> - len = mptcp_add_addr_len(opts->addr.family, echo, port);
>> - if (remaining < len)
>> + if (!mptcp_pm_should_add_signal(msk))
>> return false;
>>
>> - *size = len;
>> - if (drop_other_suboptions)
>> - *size -= opt_size;
>> - opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
>> - if (!echo) {
>> + *size = 0;
>> + mptcp_pm_add_addr_signal(msk, &local, &remote, &add_addr);
>> + if (mptcp_pm_should_add_signal_echo(msk)) {
>> + if (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;
> '''
>
>> + }
>> + len = mptcp_add_addr_len(remote.family, true, !!remote.port);
>> + if (remaining < len)
>> + return false;
>> + remaining -= len;
>> + *size += len;
>> + opts->remote = remote;
>> + flags = (u8)~BIT(MPTCP_ADD_ADDR_ECHO);
>> + opts->suboptions |= OPTION_MPTCP_ADD_ECHO;
>> + pr_debug("addr_id=%d, echo=1, port=%d addr_signal:%x",
>> + opts->remote.id, ntohs(opts->remote.port), add_addr);
>> + } else if (mptcp_pm_should_add_signal_addr(msk)) {
>> + if ((local.family == AF_INET6 || local.port) && 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;
> '''
>
> I think this "drop other suboptions" trunk here is still duplicated. Can
> we just use one "drop other suboptions" trunk only?
>
> Thanks.
> -Geliang
>
Hi Geliang, Thanks for you replay.
The commit "07f8252fe0e3c2b6320eeff18bdc5b7fb8845cb3" Davide said "echo-ed ADD_ADDR
carried over pure TCP ACKs, so there is no need to add a DSS element that would fit
only ADD_ADDR with IPv4 address.Drop the DSS from echo-ed ADD_ADDR, regardless of the
IP version."
ADD_ADDR option can add with DSS if the addr is IPv4. So I think it is more clear
to decide "drop other suboptions" in two trunk.
>
>
>> + }
>> + len = mptcp_add_addr_len(local.family, false, !!local.port);
>> + if (remaining < len)
>> + return false;
>> + *size += len;
>> + opts->addr = local;
>> opts->ahmac = add_addr_generate_hmac(msk->local_key,
>> msk->remote_key,
>> &opts->addr);
>> + opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
>> + flags = (u8)~BIT(MPTCP_ADD_ADDR_SIGNAL);
>> + pr_debug("addr_id=%d, ahmac=%llu, echo=0, port=%d, addr_signal:%x",
>> + opts->addr.id, opts->ahmac, ntohs(opts->addr.port), add_addr);
>> }
>> - pr_debug("addr_id=%d, ahmac=%llu, echo=%d, port=%d",
>> - opts->addr.id, opts->ahmac, echo, ntohs(opts->addr.port));
>> +
>> + if (drop_other_suboptions)
>> + *size -= opt_size;
>> + spin_lock_bh(&msk->pm.lock);
>> + WRITE_ONCE(msk->pm.addr_signal, flags & msk->pm.addr_signal);
>> + spin_unlock_bh(&msk->pm.lock);
>>
>> return true;
>> }
>> @@ -1228,45 +1251,51 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
>> }
>>
>> mp_capable_done:
>> - if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {
>> - u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
>> - u8 echo = MPTCP_ADDR_ECHO;
>> + if ((OPTION_MPTCP_ADD_ADDR | OPTION_MPTCP_ADD_ECHO) & opts->suboptions) {
>> + struct mptcp_addr_info *addr_info;
>> + u8 len = 0;
>> + u8 echo = 0;
>> +
>> + if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {
>> + len += sizeof(opts->ahmac);
>> + addr_info = &opts->addr;
>> + } else {
>> + echo = MPTCP_ADDR_ECHO;
>> + addr_info = &opts->remote;
>> + }
>>
>> #if IS_ENABLED(CONFIG_MPTCP_IPV6)
>> - if (opts->addr.family == AF_INET6)
>> - len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
>> + if (addr_info->family == AF_INET6)
>> + len += TCPOLEN_MPTCP_ADD_ADDR6_BASE;
>> + else
>> #endif
>> + len += TCPOLEN_MPTCP_ADD_ADDR_BASE;
>>
>> - if (opts->addr.port)
>> + if (addr_info->port)
>> len += TCPOLEN_MPTCP_PORT_LEN;
>>
>> - if (opts->ahmac) {
>> - len += sizeof(opts->ahmac);
>> - echo = 0;
>> - }
>> -
>> *ptr++ = mptcp_option(MPTCPOPT_ADD_ADDR,
>> - len, echo, opts->addr.id);
>> - if (opts->addr.family == AF_INET) {
>> - memcpy((u8 *)ptr, (u8 *)&opts->addr.addr.s_addr, 4);
>> + len, echo, addr_info->id);
>> + if (addr_info->family == AF_INET) {
>> + memcpy((u8 *)ptr, (u8 *)&addr_info->addr.s_addr, 4);
>> ptr += 1;
>> }
>> #if IS_ENABLED(CONFIG_MPTCP_IPV6)
>> - else if (opts->addr.family == AF_INET6) {
>> - memcpy((u8 *)ptr, opts->addr.addr6.s6_addr, 16);
>> + else if (addr_info->family == AF_INET6) {
>> + memcpy((u8 *)ptr, addr_info->addr6.s6_addr, 16);
>> ptr += 4;
>> }
>> #endif
>>
>> - if (!opts->addr.port) {
>> - if (opts->ahmac) {
>> + if (!addr_info->port) {
>> + if (!echo) {
>> put_unaligned_be64(opts->ahmac, ptr);
>> ptr += 2;
>> }
>> } else {
>> - u16 port = ntohs(opts->addr.port);
>> + u16 port = ntohs(addr_info->port);
>>
>> - if (opts->ahmac) {
>> + if (!echo) {
>> u8 *bptr = (u8 *)ptr;
>>
>> put_unaligned_be16(port, bptr);
>> @@ -1275,7 +1304,6 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
>> bptr += 8;
>> put_unaligned_be16(TCPOPT_NOP << 8 |
>> TCPOPT_NOP, bptr);
>> -
>> ptr += 3;
>> } else {
>> put_unaligned_be32(port << 16 |
>> diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
>> index 107a5a2..a62d4a5 100644
>> --- a/net/mptcp/pm.c
>> +++ b/net/mptcp/pm.c
>> @@ -22,7 +22,8 @@ int mptcp_pm_announce_addr(struct mptcp_sock *msk,
>>
>> lockdep_assert_held(&msk->pm.lock);
>>
>> - if (add_addr) {
>> + if (add_addr &
>> + (echo ? BIT(MPTCP_ADD_ADDR_ECHO) : BIT(MPTCP_ADD_ADDR_SIGNAL))) {
>> pr_warn("addr_signal error, add_addr=%d", add_addr);
>> return -EINVAL;
>> }
>> @@ -252,32 +253,19 @@ void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup)
>>
>> /* path manager helpers */
>>
>> -bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
>> - struct mptcp_addr_info *saddr, bool *echo, bool *port)
>> +void mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct mptcp_addr_info *saddr,
>> + struct mptcp_addr_info *daddr, u8 *add_addr)
>> {
>> - u8 add_addr;
>> - int ret = false;
>> -
>> spin_lock_bh(&msk->pm.lock);
>>
>> - /* double check after the lock is acquired */
>> - if (!mptcp_pm_should_add_signal(msk))
>> - goto out_unlock;
>> -
>> - *echo = mptcp_pm_should_add_signal_echo(msk);
>> - *port = mptcp_pm_should_add_signal_port(msk);
>> -
>> - if (remaining < mptcp_add_addr_len(msk->pm.local.family, *echo, *port))
>> - goto out_unlock;
>> -
>> *saddr = msk->pm.local;
>> - add_addr = msk->pm.addr_signal & ~(BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
>> - WRITE_ONCE(msk->pm.addr_signal, add_addr);
>> - ret = true;
>> + *daddr = msk->pm.remote;
>> + *add_addr = msk->pm.addr_signal;
>>
>> -out_unlock:
>> spin_unlock_bh(&msk->pm.lock);
>> - return ret;
>> +
>> + if ((mptcp_pm_should_add_signal_echo(msk)) && (mptcp_pm_should_add_signal_addr(msk)))
>> + mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_SEND_ACK);
>> }
>>
>> bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
>> diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
>> index a0b0ec0..90fb532 100644
>> --- a/net/mptcp/protocol.h
>> +++ b/net/mptcp/protocol.h
>> @@ -22,10 +22,11 @@
>> #define OPTION_MPTCP_MPJ_SYNACK BIT(4)
>> #define OPTION_MPTCP_MPJ_ACK BIT(5)
>> #define OPTION_MPTCP_ADD_ADDR BIT(6)
>> -#define OPTION_MPTCP_RM_ADDR BIT(7)
>> -#define OPTION_MPTCP_FASTCLOSE BIT(8)
>> -#define OPTION_MPTCP_PRIO BIT(9)
>> -#define OPTION_MPTCP_RST BIT(10)
>> +#define OPTION_MPTCP_ADD_ECHO BIT(7)
>> +#define OPTION_MPTCP_RM_ADDR BIT(8)
>> +#define OPTION_MPTCP_FASTCLOSE BIT(9)
>> +#define OPTION_MPTCP_PRIO BIT(10)
>> +#define OPTION_MPTCP_RST BIT(11)
>>
>> /* MPTCP option subtypes */
>> #define MPTCPOPT_MP_CAPABLE 0
>> @@ -760,8 +761,8 @@ static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
>> return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
>> }
>>
>> -bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
>> - struct mptcp_addr_info *saddr, bool *echo, bool *port);
>> +void mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct mptcp_addr_info *saddr,
>> + struct mptcp_addr_info *daddr, u8 *add_addr);
>> bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
>> struct mptcp_rm_list *rm_list);
>> int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
>> --
>> 1.8.3.1
>>
>
next prev parent reply other threads:[~2021-06-21 3:52 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-18 8:18 [PATCH v4 0/4] mptcp: fix conflicts when using pm.add_signal in ADD_ADDR/echo and RM_ADDR process Yonglong Li
2021-06-18 8:18 ` [PATCH v4 1/4] mptcp: fix ADD_ADDR and RM_ADDR maybe flush addr_signal each other Yonglong Li
2021-06-18 8:18 ` [PATCH v4 2/4] mptcp: make MPTCP_ADD_ADDR_SIGNAL and MPTCP_ADD_ADDR_ECHO separate Yonglong Li
2021-06-18 8:18 ` [PATCH v4 3/4] mptcp: build ADD_ADDR/echo-ADD_ADDR option according pm.add_signal Yonglong Li
2021-06-18 11:20 ` Geliang Tang
2021-06-21 3:51 ` Yonglong Li [this message]
2021-06-21 6:42 ` Geliang Tang
2021-06-21 7:15 ` Yonglong Li
2021-06-21 7:39 ` Geliang Tang
2021-06-21 7:49 ` Yonglong Li
2021-06-21 8:06 ` Geliang Tang
2021-06-21 7:42 ` Geliang Tang
2021-06-21 7:51 ` Yonglong Li
2021-06-21 8:29 ` Geliang Tang
2021-06-18 8:18 ` [PATCH v4 4/4] mptcp: remove MPTCP_ADD_ADDR_IPV6 and MPTCP_ADD_ADDR_PORT Yonglong Li
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