git: fd9de12a7110 - stable/14 - sctp: Various fixes for loader tunables

The branch stable/14 has been updated by zlei:

URL: https://cgit.FreeBSD.org/src/commit/?id=fd9de12a71109d1e3bb4b20e7d040fc9a1784dc2

commit fd9de12a71109d1e3bb4b20e7d040fc9a1784dc2
Author:     Zhenlei Huang <zlei@FreeBSD.org>
AuthorDate: 2023-10-09 04:36:48 +0000
Commit:     Zhenlei Huang <zlei@FreeBSD.org>
CommitDate: 2023-10-16 15:15:37 +0000

    sctp: Various fixes for loader tunables
    
    The following sysctl variables are actually loader tunables. Add sysctl
    flag CTLFLAG_TUN to them so that `sysctl -T` will report them correctly.
    
     1. net.inet.sctp.tcbhashsize
     2. net.inet.sctp.pcbhashsize
     3. net.inet.sctp.chunkscale
    
    The loader tunable 'net.inet.sctp.tcbhashsize' and 'net.inet.sctp.chunkscale'
    are only used during vnet initializing, thus it make no senses to make them
    writable tunable.
    
    Validate the values of loader tunables on vnet initialize, reset them to
    theirs defaults if invalid to prevent potential kernel panics.
    
    Reviewed by:    tuexen, #transport, #network
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D42007
    
    (cherry picked from commit dac91eb7660324677d8a2f71bd6f192422355ba1)
---
 sys/netinet/sctp_pcb.c    |  8 ++++++++
 sys/netinet/sctp_sysctl.c | 24 ++++++++++++++++++------
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/sys/netinet/sctp_pcb.c b/sys/netinet/sctp_pcb.c
index 16cde18c4c1d..a1742b2fffca 100644
--- a/sys/netinet/sctp_pcb.c
+++ b/sys/netinet/sctp_pcb.c
@@ -5676,6 +5676,11 @@ sctp_startup_mcore_threads(void)
 }
 #endif
 
+#define VALIDATE_LOADER_TUNABLE(var_name, prefix)		\
+	if (SCTP_BASE_SYSCTL(var_name) < prefix##_MIN ||	\
+	    SCTP_BASE_SYSCTL(var_name) > prefix##_MAX)		\
+		SCTP_BASE_SYSCTL(var_name) = prefix##_DEFAULT
+
 void
 sctp_pcb_init(void)
 {
@@ -5717,6 +5722,9 @@ sctp_pcb_init(void)
 	TUNABLE_INT_FETCH("net.inet.sctp.tcbhashsize", &SCTP_BASE_SYSCTL(sctp_hashtblsize));
 	TUNABLE_INT_FETCH("net.inet.sctp.pcbhashsize", &SCTP_BASE_SYSCTL(sctp_pcbtblsize));
 	TUNABLE_INT_FETCH("net.inet.sctp.chunkscale", &SCTP_BASE_SYSCTL(sctp_chunkscale));
+	VALIDATE_LOADER_TUNABLE(sctp_hashtblsize, SCTPCTL_TCBHASHSIZE);
+	VALIDATE_LOADER_TUNABLE(sctp_pcbtblsize, SCTPCTL_PCBHASHSIZE);
+	VALIDATE_LOADER_TUNABLE(sctp_chunkscale, SCTPCTL_CHUNKSCALE);
 	SCTP_BASE_INFO(sctp_asochash) = SCTP_HASH_INIT((SCTP_BASE_SYSCTL(sctp_hashtblsize) * 31),
 	    &SCTP_BASE_INFO(hashasocmark));
 	SCTP_BASE_INFO(sctp_ephash) = SCTP_HASH_INIT(SCTP_BASE_SYSCTL(sctp_hashtblsize),
diff --git a/sys/netinet/sctp_sysctl.c b/sys/netinet/sctp_sysctl.c
index 851ed408092b..2c2cc58ee086 100644
--- a/sys/netinet/sctp_sysctl.c
+++ b/sys/netinet/sctp_sysctl.c
@@ -867,6 +867,14 @@ sctp_sysctl_handle_trace_log_clear(SYSCTL_HANDLER_ARGS)
 #endif
 
 #define SCTP_UINT_SYSCTL(mib_name, var_name, prefix)			\
+	SCTP_UINT_SYSCTL_FLAG(mib_name, var_name, prefix,		\
+	    CTLFLAG_VNET|CTLTYPE_UINT|CTLFLAG_RW);
+
+#define SCTP_UINT_SYSCTL_TUN(mib_name, var_name, prefix)		\
+	SCTP_UINT_SYSCTL_FLAG(mib_name, var_name, prefix,		\
+	    CTLFLAG_VNET|CTLTYPE_UINT|CTLFLAG_RWTUN|CTLFLAG_NOFETCH);
+
+#define SCTP_UINT_SYSCTL_FLAG(mib_name, var_name, prefix, flags)	\
 	static int							\
 	sctp_sysctl_handle_##mib_name(SYSCTL_HANDLER_ARGS)		\
 	{								\
@@ -885,9 +893,13 @@ sctp_sysctl_handle_trace_log_clear(SYSCTL_HANDLER_ARGS)
 		}							\
 		return (error);						\
 	}								\
-	SYSCTL_PROC(_net_inet_sctp, OID_AUTO, mib_name,			\
-	                 CTLFLAG_VNET|CTLTYPE_UINT|CTLFLAG_RW, NULL, 0,	\
-	                 sctp_sysctl_handle_##mib_name, "UI", prefix##_DESC);
+	SYSCTL_PROC(_net_inet_sctp, OID_AUTO, mib_name, flags,		\
+	    NULL, 0, sctp_sysctl_handle_##mib_name, "UI", prefix##_DESC)
+
+#define SCTP_UINT_SYSCTL_RDTUN(mib_name, var_name, prefix)		\
+	SYSCTL_UINT(_net_inet_sctp, OID_AUTO, mib_name,			\
+	    CTLFLAG_VNET|CTLFLAG_RDTUN|CTLFLAG_NOFETCH,			\
+	    &VNET_NAME(system_base_info.sctpsysctl.var_name), 0, prefix##_DESC);
 
 /*
  * sysctl definitions
@@ -909,10 +921,10 @@ SCTP_UINT_SYSCTL(peer_chkoh, sctp_peer_chunk_oh, SCTPCTL_PEER_CHKOH)
 SCTP_UINT_SYSCTL(maxburst, sctp_max_burst_default, SCTPCTL_MAXBURST)
 SCTP_UINT_SYSCTL(fr_maxburst, sctp_fr_max_burst_default, SCTPCTL_FRMAXBURST)
 SCTP_UINT_SYSCTL(maxchunks, sctp_max_chunks_on_queue, SCTPCTL_MAXCHUNKS)
-SCTP_UINT_SYSCTL(tcbhashsize, sctp_hashtblsize, SCTPCTL_TCBHASHSIZE)
-SCTP_UINT_SYSCTL(pcbhashsize, sctp_pcbtblsize, SCTPCTL_PCBHASHSIZE)
+SCTP_UINT_SYSCTL_RDTUN(tcbhashsize, sctp_hashtblsize, SCTPCTL_TCBHASHSIZE)
+SCTP_UINT_SYSCTL_TUN(pcbhashsize, sctp_pcbtblsize, SCTPCTL_PCBHASHSIZE)
 SCTP_UINT_SYSCTL(min_split_point, sctp_min_split_point, SCTPCTL_MIN_SPLIT_POINT)
-SCTP_UINT_SYSCTL(chunkscale, sctp_chunkscale, SCTPCTL_CHUNKSCALE)
+SCTP_UINT_SYSCTL_RDTUN(chunkscale, sctp_chunkscale, SCTPCTL_CHUNKSCALE)
 SCTP_UINT_SYSCTL(delayed_sack_time, sctp_delayed_sack_time_default, SCTPCTL_DELAYED_SACK_TIME)
 SCTP_UINT_SYSCTL(sack_freq, sctp_sack_freq_default, SCTPCTL_SACK_FREQ)
 SCTP_UINT_SYSCTL(sys_resource, sctp_system_free_resc_limit, SCTPCTL_SYS_RESOURCE)