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sctp: add support for setting flowlabel when adding a transport

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Struct sockaddr_in6 has the member sin6_flowinfo that includes the
ipv6 flowlabel, it should also support for setting flowlabel when
adding a transport whose ipaddr is from userspace.

Note that addrinfo in sctp_sendmsg is using struct in6_addr for
the secondary addrs, which doesn't contain sin6_flowinfo, and
it needs to copy sin6_flowinfo from the primary addr.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2018-07-02 18:21:14 +08:00
committed by David S. Miller
parent 0b0dce7a36
commit 4be4139f7d
2 changed files with 15 additions and 2 deletions
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5
net/sctp/socket.c
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@@ -1697,6 +1697,7 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
struct sctp_association *asoc;
enum sctp_scope scope;
struct cmsghdr *cmsg;
__be32 flowinfo = 0;
struct sctp_af *af;
int err;
@@ -1781,6 +1782,9 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
if (!cmsgs->addrs_msg)
return 0;
if (daddr->sa.sa_family == AF_INET6)
flowinfo = daddr->v6.sin6_flowinfo;
/* sendv addr list parse */
for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
struct sctp_transport *transport;
@@ -1813,6 +1817,7 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
}
dlen = sizeof(struct in6_addr);
daddr->v6.sin6_flowinfo = flowinfo;
daddr->v6.sin6_family = AF_INET6;
daddr->v6.sin6_port = htons(asoc->peer.port);
memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);