From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A922168 for ; Fri, 25 Jun 2021 11:43:39 +0000 (UTC) Received: by mail-pf1-f179.google.com with SMTP id s14so6559741pfg.0 for ; Fri, 25 Jun 2021 04:43:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=duKjyscV+OVtUVz47nGKcFkj70F/7ozxgYVUI5eGLdQ=; b=scr7XwaKfYd7hLWCaGUyfhGQPH0G5gb1IrYnjX6O0FwneiyG3Wo1jOiUip9G2CoEJP eLInQKgILFPtoE1ZNDVgkqa39tbV0f75sNBOVUXIcwHyzBYcvy1vm9sS5V3nJTttGQ7P RsALs/3XEWLQfwrnaPucGJbTIya2X0qcqrPCPzESunUEsEeoSRZyCI7FLt4ouG/Bf/1E SSZ109h4sZZbRoxIIhe//BlqLU8airJcxc4pzU23T995rxZMrHj2wpvfhdYYGvRwGcap h1e0Zqv2SQKF/bdmuigwel1tZsqSDeKYq/cskNtVZHk+ejN8VNm1fE2gBlQjkvsuCb0o pQnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=duKjyscV+OVtUVz47nGKcFkj70F/7ozxgYVUI5eGLdQ=; b=B7izKbWYtOoZphTNP5sOnIOpe1kRq5J7+70Avkd+Vi4o2/eXA6dAc1NDjEEmHjaCGm TWAzXIuznfnsGd2iEoke5pJN9rtgeBWqRujVE0GNefgnmuhzyVooWY7HEolrh8LoyFTQ y78qtNryI7AwxmNXvyZwgrVALGyPIJORBmmI7JjusfccPTBVW9nbDfS7Cg21Kea3is1A T3f2mYz4ZDe1R3l4l61jQ4GljCuwCi7OAd67Ffl+UVZv+o0gjXlb17Vvc1GYyVdlbXmN 2pSBu/cwXghdp9ZsxOd6jHbE2FC5kE2hcRRjlcMNmLgohrRW4GNw7o5ADNOZBtogKW/l NJRA== X-Gm-Message-State: AOAM530TOJcLkcvVCVg25DOJKWCdRvMdy33RQ7XLZWu3U6U1JUAb+yGH +pSLkprGAnxgHfAB+i4TlUMbhqK5PYjrH4l3mqE= X-Google-Smtp-Source: ABdhPJzvlFI4J5fetCv3n1O/GDoKgdBfbECg+BrZKerxF1MD0/7rq3kU6fkBv+eFeW0NbWcLShQoPEC39WkWAabCAZE= X-Received: by 2002:aa7:8d01:0:b029:2f0:88da:1821 with SMTP id j1-20020aa78d010000b02902f088da1821mr9989851pfe.67.1624621419060; Fri, 25 Jun 2021 04:43:39 -0700 (PDT) Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <1624337135-149084-1-git-send-email-liyonglong@chinatelecom.cn> <1624337135-149084-4-git-send-email-liyonglong@chinatelecom.cn> In-Reply-To: <1624337135-149084-4-git-send-email-liyonglong@chinatelecom.cn> From: Geliang Tang Date: Fri, 25 Jun 2021 19:43:27 +0800 Message-ID: Subject: Re: [PATCH v5 3/4] mptcp: build ADD_ADDR/echo-ADD_ADDR option according pm.add_signal To: Yonglong Li Cc: mptcp@lists.linux.dev, Mat Martineau Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yonglong Li =E4=BA=8E2021=E5=B9=B46=E6=9C=8822= =E6=97=A5=E5=91=A8=E4=BA=8C =E4=B8=8B=E5=8D=8812:46=E5=86=99=E9=81=93=EF=BC= =9A > > 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 > --- > include/net/mptcp.h | 2 +- > net/mptcp/options.c | 105 ++++++++++++++++++++++++++++++---------------= ------ > net/mptcp/pm.c | 30 +++++---------- > net/mptcp/protocol.h | 13 ++++--- > 4 files changed, 80 insertions(+), 70 deletions(-) > > diff --git a/include/net/mptcp.h b/include/net/mptcp.h > index 637e90b..d2c6ebe 100644 > --- a/include/net/mptcp.h > +++ b/include/net/mptcp.h > @@ -61,7 +61,7 @@ struct mptcp_out_options { > u64 sndr_key; > u64 rcvr_key; > u64 ahmac; > - struct mptcp_addr_info addr; > + struct mptcp_addr_info local; > struct mptcp_addr_info remote; > struct mptcp_rm_list rm_list; > u8 join_id; > diff --git a/net/mptcp/options.c b/net/mptcp/options.c > index 1aec016..a1fafed 100644 > --- a/net/mptcp/options.c > +++ b/net/mptcp/options.c > @@ -655,13 +655,19 @@ static bool mptcp_established_options_add_addr(stru= ct sock *sk, struct sk_buff * > struct mptcp_sock *msk =3D mptcp_sk(subflow->conn); > bool drop_other_suboptions =3D false; > unsigned int opt_size =3D *size; > - bool echo; > - bool port; > - int len; > + struct mptcp_addr_info remote; > + struct mptcp_addr_info local; > + u8 add_addr, flags =3D 0xff; > + int len =3D 0; > > - if ((mptcp_pm_should_add_signal_ipv6(msk) || > - mptcp_pm_should_add_signal_port(msk) || > - mptcp_pm_should_add_signal_echo(msk)) && > + if (!mptcp_pm_should_add_signal(msk)) > + return false; > + > + mptcp_pm_add_addr_signal(msk, &local, &remote, &add_addr); > + if ((mptcp_pm_should_add_signal_echo(msk) || > + (!mptcp_pm_should_add_signal_echo(msk) && I think this '!mptcp_pm_should_add_signal_echo(msk) &&' could be dropped, WDYT? -Geliang > + mptcp_pm_should_add_signal_addr(msk) && > + (local.family =3D=3D AF_INET6 || local.port))) && > skb && skb_is_tcp_pure_ack(skb)) { > pr_debug("drop other suboptions"); > opts->suboptions =3D 0; > @@ -671,25 +677,35 @@ static bool mptcp_established_options_add_addr(stru= ct sock *sk, struct sk_buff * > drop_other_suboptions =3D true; > } > > - if (!mptcp_pm_should_add_signal(msk) || > - !(mptcp_pm_add_addr_signal(msk, remaining, &opts->addr, &echo= , &port))) > - return false; > - > - len =3D mptcp_add_addr_len(opts->addr.family, echo, port); > - if (remaining < len) > - return false; > + if (mptcp_pm_should_add_signal_echo(msk)) { > + len =3D mptcp_add_addr_len(remote.family, true, !!remote.= port); > + if (remaining < len) > + return false; > + opts->remote =3D remote; > + flags =3D (u8)~BIT(MPTCP_ADD_ADDR_ECHO); > + opts->suboptions |=3D OPTION_MPTCP_ADD_ECHO; > + } else { > + len =3D mptcp_add_addr_len(local.family, false, !!local.p= ort); > + if (remaining < len) > + return false; > + opts->local =3D local; > + opts->ahmac =3D add_addr_generate_hmac(msk->local_key, > + msk->remote_key, > + &opts->local); > + opts->suboptions |=3D OPTION_MPTCP_ADD_ADDR; > + flags =3D (u8)~BIT(MPTCP_ADD_ADDR_SIGNAL); > + } > > *size =3D len; > if (drop_other_suboptions) > *size -=3D opt_size; > - opts->suboptions |=3D OPTION_MPTCP_ADD_ADDR; > - if (!echo) { > - opts->ahmac =3D add_addr_generate_hmac(msk->local_key, > - msk->remote_key, > - &opts->addr); > - } > - pr_debug("addr_id=3D%d, ahmac=3D%llu, echo=3D%d, port=3D%d", > - opts->addr.id, opts->ahmac, echo, ntohs(opts->addr.port)= ); > + spin_lock_bh(&msk->pm.lock); > + WRITE_ONCE(msk->pm.addr_signal, flags & msk->pm.addr_signal); > + spin_unlock_bh(&msk->pm.lock); > + > + pr_debug("addr_signal:%x, echo=3D%d, local_addr_id=3D%d, ahmac=3D= %llu, local_port=3D%d, remote_addr_id=3D%d, remote_port=3D%d", > + add_addr, mptcp_pm_should_add_signal_echo(msk), opts->lo= cal.id, > + opts->ahmac, ntohs(opts->local.port), opts->remote.id, n= tohs(opts->remote.port)); > > return true; > } > @@ -1228,45 +1244,51 @@ void mptcp_write_options(__be32 *ptr, const struc= t tcp_sock *tp, > } > > mp_capable_done: > - if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) { > - u8 len =3D TCPOLEN_MPTCP_ADD_ADDR_BASE; > - u8 echo =3D MPTCP_ADDR_ECHO; > + if ((OPTION_MPTCP_ADD_ADDR | OPTION_MPTCP_ADD_ECHO) & opts->subop= tions) { > + struct mptcp_addr_info *addr_info; > + u8 len =3D 0; > + u8 echo =3D 0; > + > + if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) { > + len +=3D sizeof(opts->ahmac); > + addr_info =3D &opts->local; > + } else { > + echo =3D MPTCP_ADDR_ECHO; > + addr_info =3D &opts->remote; > + } > > #if IS_ENABLED(CONFIG_MPTCP_IPV6) > - if (opts->addr.family =3D=3D AF_INET6) > - len =3D TCPOLEN_MPTCP_ADD_ADDR6_BASE; > + if (addr_info->family =3D=3D AF_INET6) > + len +=3D TCPOLEN_MPTCP_ADD_ADDR6_BASE; > + else > #endif > + len +=3D TCPOLEN_MPTCP_ADD_ADDR_BASE; > > - if (opts->addr.port) > + if (addr_info->port) > len +=3D TCPOLEN_MPTCP_PORT_LEN; > > - if (opts->ahmac) { > - len +=3D sizeof(opts->ahmac); > - echo =3D 0; > - } > - > *ptr++ =3D mptcp_option(MPTCPOPT_ADD_ADDR, > - len, echo, opts->addr.id); > - if (opts->addr.family =3D=3D AF_INET) { > - memcpy((u8 *)ptr, (u8 *)&opts->addr.addr.s_addr, = 4); > + len, echo, addr_info->id); > + if (addr_info->family =3D=3D AF_INET) { > + memcpy((u8 *)ptr, (u8 *)&addr_info->addr.s_addr, = 4); > ptr +=3D 1; > } > #if IS_ENABLED(CONFIG_MPTCP_IPV6) > - else if (opts->addr.family =3D=3D AF_INET6) { > - memcpy((u8 *)ptr, opts->addr.addr6.s6_addr, 16); > + else if (addr_info->family =3D=3D AF_INET6) { > + memcpy((u8 *)ptr, addr_info->addr6.s6_addr, 16); > ptr +=3D 4; > } > #endif > > - if (!opts->addr.port) { > - if (opts->ahmac) { > + if (!addr_info->port) { > + if (!echo) { > put_unaligned_be64(opts->ahmac, ptr); > ptr +=3D 2; > } > } else { > - u16 port =3D ntohs(opts->addr.port); > + u16 port =3D ntohs(addr_info->port); > > - if (opts->ahmac) { > + if (!echo) { > u8 *bptr =3D (u8 *)ptr; > > put_unaligned_be16(port, bptr); > @@ -1275,7 +1297,6 @@ void mptcp_write_options(__be32 *ptr, const struct = tcp_sock *tp, > bptr +=3D 8; > put_unaligned_be16(TCPOPT_NOP << 8 | > TCPOPT_NOP, bptr); > - > ptr +=3D 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=3D%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 remai= ning, > - 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 =3D 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 =3D mptcp_pm_should_add_signal_echo(msk); > - *port =3D mptcp_pm_should_add_signal_port(msk); > - > - if (remaining < mptcp_add_addr_len(msk->pm.local.family, *echo, *= port)) > - goto out_unlock; > - > *saddr =3D msk->pm.local; > - add_addr =3D msk->pm.addr_signal & ~(BIT(MPTCP_ADD_ADDR_SIGNAL) |= BIT(MPTCP_ADD_ADDR_ECHO)); > - WRITE_ONCE(msk->pm.addr_signal, add_addr); > - ret =3D true; > + *daddr =3D msk->pm.remote; > + *add_addr =3D 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_ad= d_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 remain= ing, > 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 mptc= p_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 remai= ning, > - 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 remain= ing, > struct mptcp_rm_list *rm_list); > int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *sk= c); > -- > 1.8.3.1 >