[PATCH net-next 1/5] mptcp: support MPJoin with IPv4 mapped in v6 sk
From: Mat Martineau <hidden>
Date: 2021-01-26 02:14:36
Also in:
mptcp
Subsystem:
networking [general], networking [mptcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Matthieu Baerts, Mat Martineau, Linus Torvalds
From: Matthieu Baerts <redacted>
With an IPv4 mapped in v6 socket, we were trying to call inet6_bind()
with an IPv4 address resulting in a -EINVAL error because the given
addr_len -- size of the address structure -- was too short.
We now make sure to use address structures for the same family as the
MPTCP socket for both the bind() and the connect(). It means we convert
v4 addresses to v4 mapped in v6 or the opposite if needed.
Fixes: ec3edaa7ca6c ("mptcp: Add handling of outgoing MP_JOIN requests")
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/122
Co-developed-by: Geliang Tang <redacted>
Signed-off-by: Geliang Tang <redacted>
Signed-off-by: Matthieu Baerts <redacted>
Signed-off-by: Mat Martineau <redacted>
---
net/mptcp/subflow.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 721059916c96..586156281e5a 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c@@ -1085,21 +1085,31 @@ void mptcpv6_handle_mapped(struct sock *sk, bool mapped) #endif static void mptcp_info2sockaddr(const struct mptcp_addr_info *info, - struct sockaddr_storage *addr) + struct sockaddr_storage *addr, + unsigned short family) { memset(addr, 0, sizeof(*addr)); - addr->ss_family = info->family; + addr->ss_family = family; if (addr->ss_family == AF_INET) { struct sockaddr_in *in_addr = (struct sockaddr_in *)addr; - in_addr->sin_addr = info->addr; + if (info->family == AF_INET) + in_addr->sin_addr = info->addr; +#if IS_ENABLED(CONFIG_MPTCP_IPV6) + else if (ipv6_addr_v4mapped(&info->addr6)) + in_addr->sin_addr.s_addr = info->addr6.s6_addr32[3]; +#endif in_addr->sin_port = info->port; } #if IS_ENABLED(CONFIG_MPTCP_IPV6) else if (addr->ss_family == AF_INET6) { struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)addr; - in6_addr->sin6_addr = info->addr6; + if (info->family == AF_INET) + ipv6_addr_set_v4mapped(info->addr.s_addr, + &in6_addr->sin6_addr); + else + in6_addr->sin6_addr = info->addr6; in6_addr->sin6_port = info->port; } #endif
@@ -1143,11 +1153,11 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, subflow->remote_key = msk->remote_key; subflow->local_key = msk->local_key; subflow->token = msk->token; - mptcp_info2sockaddr(loc, &addr); + mptcp_info2sockaddr(loc, &addr, ssk->sk_family); addrlen = sizeof(struct sockaddr_in); #if IS_ENABLED(CONFIG_MPTCP_IPV6) - if (loc->family == AF_INET6) + if (addr.ss_family == AF_INET6) addrlen = sizeof(struct sockaddr_in6); #endif ssk->sk_bound_dev_if = loc->ifindex;
@@ -1163,7 +1173,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, subflow->remote_id = remote_id; subflow->request_join = 1; subflow->request_bkup = !!(loc->flags & MPTCP_PM_ADDR_FLAG_BACKUP); - mptcp_info2sockaddr(remote, &addr); + mptcp_info2sockaddr(remote, &addr, ssk->sk_family); mptcp_add_pending_subflow(msk, subflow); err = kernel_connect(sf, (struct sockaddr *)&addr, addrlen, O_NONBLOCK);
--
2.30.0