Author: asomers
Date: Thu Mar 6 20:24:15 2014
New Revision: 262867
URL: http://svnweb.freebsd.org/changeset/base/262867
Log:
Fix PR kern/185813 "SOCK_SEQPACKET AF_UNIX sockets with asymmetrical
buffers drop packets". It was caused by a check for the space available
in a sockbuf, but it was checking the wrong sockbuf.
sys/sys/sockbuf.h
sys/kern/uipc_sockbuf.c
Add sbappendaddr_nospacecheck_locked(), which is just like
sbappendaddr_locked but doesn't validate the receiving socket's
space. Factor out common code into sbappendaddr_locked_internal().
We shouldn't simply make sbappendaddr_locked check the space and
then call sbappendaddr_nospacecheck_locked, because that would cause
the O(n) function m_length to be called twice.
sys/kern/uipc_usrreq.c
Use sbappendaddr_nospacecheck_locked for SOCK_SEQPACKET sockets,
because the receiving sockbuf's size limit is irrelevant.
tests/sys/kern/unix_seqpacket_test.c
Now that 185813 is fixed, pipe_128k_8k fails intermittently due to
185812. Make it fail every time by adding a usleep after starting
the writer thread and before starting the reader thread in
test_pipe. That gives the writer time to fill up its send buffer.
Also, clear the expected failure message due to 185813. It actually
said "185812", but that was a typo.
PR: kern/185813
Reviewed by: silence from freebsd-net@ and rwatson@
MFC after: 3 weeks
Sponsored by: Spectra Logic Corporation
Modified:
head/sys/kern/uipc_sockbuf.c
head/sys/kern/uipc_usrreq.c
head/sys/sys/sockbuf.h
head/tests/sys/kern/unix_seqpacket_test.c
Modified: head/sys/kern/uipc_sockbuf.c
==============================================================================
--- head/sys/kern/uipc_sockbuf.c Thu Mar 6 20:05:13 2014
(r262866)
+++ head/sys/kern/uipc_sockbuf.c Thu Mar 6 20:24:15 2014
(r262867)
@@ -620,29 +620,12 @@ sbappendrecord(struct sockbuf *sb, struc
SOCKBUF_UNLOCK(sb);
}
-/*
- * Append address and data, and optionally, control (ancillary) data to the
- * receive queue of a socket. If present, m0 must include a packet header
- * with total length. Returns 0 if no space in sockbuf or insufficient
- * mbufs.
- */
-int
-sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
- struct mbuf *m0, struct mbuf *control)
+/* Helper routine that appends data, control, and address to a sockbuf. */
+static int
+sbappendaddr_locked_internal(struct sockbuf *sb, const struct sockaddr *asa,
+ struct mbuf *m0, struct mbuf *control, struct mbuf *ctrl_last)
{
struct mbuf *m, *n, *nlast;
- int space = asa->sa_len;
-
- SOCKBUF_LOCK_ASSERT(sb);
-
- if (m0 && (m0->m_flags & M_PKTHDR) == 0)
- panic("sbappendaddr_locked");
- if (m0)
- space += m0->m_pkthdr.len;
- space += m_length(control, &n);
-
- if (space > sbspace(sb))
- return (0);
#if MSIZE <= 256
if (asa->sa_len > MLEN)
return (0);
@@ -652,8 +635,8 @@ sbappendaddr_locked(struct sockbuf *sb,
return (0);
m->m_len = asa->sa_len;
bcopy(asa, mtod(m, caddr_t), asa->sa_len);
- if (n)
- n->m_next = m0; /* concatenate data to control */
+ if (ctrl_last)
+ ctrl_last->m_next = m0; /* concatenate data to control */
else
control = m0;
m->m_next = control;
@@ -677,6 +660,50 @@ sbappendaddr_locked(struct sockbuf *sb,
* mbufs.
*/
int
+sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
+ struct mbuf *m0, struct mbuf *control)
+{
+ struct mbuf *ctrl_last;
+ int space = asa->sa_len;
+
+ SOCKBUF_LOCK_ASSERT(sb);
+
+ if (m0 && (m0->m_flags & M_PKTHDR) == 0)
+ panic("sbappendaddr_locked");
+ if (m0)
+ space += m0->m_pkthdr.len;
+ space += m_length(control, &ctrl_last);
+
+ if (space > sbspace(sb))
+ return (0);
+ return (sbappendaddr_locked_internal(sb, asa, m0, control, ctrl_last));
+}
+
+/*
+ * Append address and data, and optionally, control (ancillary) data to the
+ * receive queue of a socket. If present, m0 must include a packet header
+ * with total length. Returns 0 if insufficient mbufs. Does not validate
space
+ * on the receiving sockbuf.
+ */
+int
+sbappendaddr_nospacecheck_locked(struct sockbuf *sb, const struct sockaddr
*asa,
+ struct mbuf *m0, struct mbuf *control)
+{
+ struct mbuf *ctrl_last;
+
+ SOCKBUF_LOCK_ASSERT(sb);
+
+ ctrl_last = (control == NULL) ? NULL : m_last(control);
+ return (sbappendaddr_locked_internal(sb, asa, m0, control, ctrl_last));
+}
+
+/*
+ * Append address and data, and optionally, control (ancillary) data to the
+ * receive queue of a socket. If present, m0 must include a packet header
+ * with total length. Returns 0 if no space in sockbuf or insufficient
+ * mbufs.
+ */
+int
sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
struct mbuf *m0, struct mbuf *control)
{
Modified: head/sys/kern/uipc_usrreq.c
==============================================================================
--- head/sys/kern/uipc_usrreq.c Thu Mar 6 20:05:13 2014 (r262866)
+++ head/sys/kern/uipc_usrreq.c Thu Mar 6 20:24:15 2014 (r262867)
@@ -892,7 +892,8 @@ uipc_send(struct socket *so, int flags,
from = &sun_noname;
so2 = unp2->unp_socket;
SOCKBUF_LOCK(&so2->so_rcv);
- if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
+ if (sbappendaddr_nospacecheck_locked(&so2->so_rcv, from, m,
+ control)) {
sorwakeup_locked(so2);
m = NULL;
control = NULL;
@@ -977,8 +978,14 @@ uipc_send(struct socket *so, int flags,
const struct sockaddr *from;
from = &sun_noname;
- if (sbappendaddr_locked(&so2->so_rcv, from, m,
- control))
+ /*
+ * Don't check for space available in so2->so_rcv.
+ * Unix domain sockets only check for space in the
+ * sending sockbuf, and that check is performed one
+ * level up the stack.
+ */
+ if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
+ from, m, control))
control = NULL;
break;
}
Modified: head/sys/sys/sockbuf.h
==============================================================================
--- head/sys/sys/sockbuf.h Thu Mar 6 20:05:13 2014 (r262866)
+++ head/sys/sys/sockbuf.h Thu Mar 6 20:24:15 2014 (r262867)
@@ -127,6 +127,8 @@ int sbappendaddr(struct sockbuf *sb, con
struct mbuf *m0, struct mbuf *control);
int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
struct mbuf *m0, struct mbuf *control);
+int sbappendaddr_nospacecheck_locked(struct sockbuf *sb,
+ const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control);
int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
struct mbuf *control);
int sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
Modified: head/tests/sys/kern/unix_seqpacket_test.c
==============================================================================
--- head/tests/sys/kern/unix_seqpacket_test.c Thu Mar 6 20:05:13 2014
(r262866)
+++ head/tests/sys/kern/unix_seqpacket_test.c Thu Mar 6 20:24:15 2014
(r262867)
@@ -361,6 +361,12 @@ test_pipe(size_t sndbufsize, size_t rcvb
reader_data.so = sv[1];
ATF_REQUIRE_EQ(0, pthread_create(&writer, NULL, test_pipe_writer,
(void*)&writer_data));
+ /*
+ * Give the writer time to start writing, and hopefully block, before
+ * starting the reader. This increases the likelihood of the test case
+ * failing due to PR kern/185812
+ */
+ usleep(1000);
ATF_REQUIRE_EQ(0, pthread_create(&reader, NULL, test_pipe_reader,
(void*)&reader_data));
@@ -951,7 +957,6 @@ ATF_TC_BODY(pipe_simulator_8k_128k, tc)
ATF_TC_WITHOUT_HEAD(pipe_simulator_128k_8k);
ATF_TC_BODY(pipe_simulator_128k_8k, tc)
{
- atf_tc_expect_fail("PR kern/185812 SOCK_SEQPACKET AF_UNIX sockets with
asymmetrical buffers drop packets");
test_pipe_simulator(131072, 8192);
}
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