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@xxxxxxxxx>
---
net/sctp/associola.c | 12 ++++++++++--
net/sctp/socket.c | 5 +++++
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 16ecfbc..297d9cf 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -650,8 +650,16 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
peer->sackdelay = asoc->sackdelay;
peer->sackfreq = asoc->sackfreq;
- if (addr->sa.sa_family == AF_INET6)
- peer->flowlabel = asoc->flowlabel;
+ if (addr->sa.sa_family == AF_INET6) {
+ __be32 info = addr->v6.sin6_flowinfo;
+
+ if (info) {
+ peer->flowlabel = ntohl(info & IPV6_FLOWLABEL_MASK);
+ peer->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
+ } else {
+ peer->flowlabel = asoc->flowlabel;
+ }
+ }
peer->dscp = asoc->dscp;
/* Enable/disable heartbeat, SACK delay, and path MTU discovery
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 452029f..2607b50 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -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);
--
2.1.0
--
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