From ef11ce24875a8a540adc185e7bce3d7d49c8296f Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 12 May 2014 11:22:47 +1000 Subject: SUNRPC: track whether a request is coming from a loop-back interface. If an incoming NFS request is coming from the local host, then nfsd will need to perform some special handling. So detect that possibility and make the source visible in rq_local. Signed-off-by: NeilBrown Signed-off-by: J. Bruce Fields --- net/sunrpc/sunrpc.h | 13 +++++++++++++ net/sunrpc/svcsock.c | 5 +++++ 2 files changed, 18 insertions(+) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sunrpc.h b/net/sunrpc/sunrpc.h index 14c9f6d1c5ff..f2b7cb540e61 100644 --- a/net/sunrpc/sunrpc.h +++ b/net/sunrpc/sunrpc.h @@ -43,6 +43,19 @@ static inline int rpc_reply_expected(struct rpc_task *task) (task->tk_msg.rpc_proc->p_decode != NULL); } +static inline int sock_is_loopback(struct sock *sk) +{ + struct dst_entry *dst; + int loopback = 0; + rcu_read_lock(); + dst = rcu_dereference(sk->sk_dst_cache); + if (dst && dst->dev && + (dst->dev->features & NETIF_F_LOOPBACK)) + loopback = 1; + rcu_read_unlock(); + return loopback; +} + int svc_send_common(struct socket *sock, struct xdr_buf *xdr, struct page *headpage, unsigned long headoffset, struct page *tailpage, unsigned long tailoffset); diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 0cb34f5d58dc..f3b8eb309d01 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -874,6 +874,10 @@ static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) } svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); + if (sock_is_loopback(newsock->sk)) + set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); + else + clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); if (serv->sv_stats) serv->sv_stats->nettcpconn++; @@ -1119,6 +1123,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) rqstp->rq_xprt_ctxt = NULL; rqstp->rq_prot = IPPROTO_TCP; + rqstp->rq_local = !!test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags); p = (__be32 *)rqstp->rq_arg.head[0].iov_base; calldir = p[1]; -- cgit v1.2.1