From 84e68e9b9b39002f4a9ae79f39fc89cca081077b Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Fri, 10 May 2024 17:12:16 +0200 Subject: [PATCH] mptcp: annotate access for msk keys JIRA: https://issues.redhat.com/browse/RHEL-28492 Tested: LNST, Tier1 Upstream commit: commit 1c09d7cbb57abcea66148923cef717cc7ab35704 Author: Paolo Abeni Date: Fri Feb 2 12:40:07 2024 +0100 mptcp: annotate access for msk keys Both the local and the remote key follow the same locking schema, put in place the proper ONCE accessors. Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: David S. Miller Signed-off-by: Paolo Abeni --- net/mptcp/options.c | 12 ++++++------ net/mptcp/protocol.c | 2 +- net/mptcp/protocol.h | 6 ++++-- net/mptcp/subflow.c | 10 ++++++---- 4 files changed, 17 insertions(+), 13 deletions(-) diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 7cf4a0c69786..8fa802f6096e 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -688,8 +688,8 @@ static bool mptcp_established_options_add_addr(struct sock *sk, struct sk_buff * opts->suboptions |= OPTION_MPTCP_ADD_ADDR; if (!echo) { MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDRTX); - opts->ahmac = add_addr_generate_hmac(msk->local_key, - msk->remote_key, + opts->ahmac = add_addr_generate_hmac(READ_ONCE(msk->local_key), + READ_ONCE(msk->remote_key), &opts->addr); } else { MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADDTX); @@ -791,7 +791,7 @@ static bool mptcp_established_options_fastclose(struct sock *sk, *size = TCPOLEN_MPTCP_FASTCLOSE; opts->suboptions |= OPTION_MPTCP_FASTCLOSE; - opts->rcvr_key = msk->remote_key; + opts->rcvr_key = READ_ONCE(msk->remote_key); pr_debug("FASTCLOSE key=%llu", opts->rcvr_key); MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFASTCLOSETX); @@ -1099,8 +1099,8 @@ static bool add_addr_hmac_valid(struct mptcp_sock *msk, if (mp_opt->echo) return true; - hmac = add_addr_generate_hmac(msk->remote_key, - msk->local_key, + hmac = add_addr_generate_hmac(READ_ONCE(msk->remote_key), + READ_ONCE(msk->local_key), &mp_opt->addr); pr_debug("msk=%p, ahmac=%llu, mp_opt->ahmac=%llu\n", @@ -1147,7 +1147,7 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb) if (unlikely(mp_opt.suboptions != OPTION_MPTCP_DSS)) { if ((mp_opt.suboptions & OPTION_MPTCP_FASTCLOSE) && - msk->local_key == mp_opt.rcvr_key) { + READ_ONCE(msk->local_key) == mp_opt.rcvr_key) { WRITE_ONCE(msk->rcv_fastclose, true); mptcp_schedule_work((struct sock *)msk); MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFASTCLOSERX); diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 75b3501361c2..ecb9ac322172 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3251,7 +3251,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk, mptcp_copy_ip_options(nsk, sk); msk = mptcp_sk(nsk); - msk->local_key = subflow_req->local_key; + WRITE_ONCE(msk->local_key, subflow_req->local_key); msk->token = subflow_req->token; msk->in_accept_queue = 1; WRITE_ONCE(msk->fully_established, false); diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 07f6242afc1a..9227c8a591af 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -260,8 +260,10 @@ struct mptcp_data_frag { struct mptcp_sock { /* inet_connection_sock must be the first member */ struct inet_connection_sock sk; - u64 local_key; - u64 remote_key; + u64 local_key; /* protected by the first subflow socket lock + * lockless access read + */ + u64 remote_key; /* same as above */ u64 write_seq; u64 bytes_sent; u64 snd_nxt; diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 22084a5686f6..0944690ce09c 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -75,7 +75,8 @@ static void subflow_req_create_thmac(struct mptcp_subflow_request_sock *subflow_ get_random_bytes(&subflow_req->local_nonce, sizeof(u32)); - subflow_generate_hmac(msk->local_key, msk->remote_key, + subflow_generate_hmac(READ_ONCE(msk->local_key), + READ_ONCE(msk->remote_key), subflow_req->local_nonce, subflow_req->remote_nonce, hmac); @@ -714,7 +715,8 @@ static bool subflow_hmac_valid(const struct request_sock *req, if (!msk) return false; - subflow_generate_hmac(msk->remote_key, msk->local_key, + subflow_generate_hmac(READ_ONCE(msk->remote_key), + READ_ONCE(msk->local_key), subflow_req->remote_nonce, subflow_req->local_nonce, hmac); @@ -1550,8 +1552,8 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, mptcp_pm_get_flags_and_ifindex_by_id(msk, local_id, &flags, &ifindex); subflow->remote_key_valid = 1; - subflow->remote_key = msk->remote_key; - subflow->local_key = msk->local_key; + subflow->remote_key = READ_ONCE(msk->remote_key); + subflow->local_key = READ_ONCE(msk->local_key); subflow->token = msk->token; mptcp_info2sockaddr(loc, &addr, ssk->sk_family);