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Export the udp_cksum sysctl for upcoming SCTP work. Rather than always,

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SCTP will only do IPv4 UDP checksum calculation as defined by the host
policy.  When tunneling SCTP always calculates the inner checksum already
so not doing the outer UDP can save cycles.

While here virtualize the variable.

Requested by:	tuexen
MFC after:	2 weeks
This commit is contained in:
Bjoern A. Zeeb 2012-03-27 15:14:29 +00:00
parent 9c1f1330d6
commit 40b676bea6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=233554
2 changed files with 6 additions and 4 deletions
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8
sys/netinet/udp_usrreq.c
View File

@ -105,9 +105,9 @@ __FBSDID("$FreeBSD$");
* packets that would otherwise be discarded due to bad checksums, and may
* cause problems (especially for NFS data blocks).
*/
static int udp_cksum = 1;
SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum,
0, "compute udp checksum");
VNET_DEFINE(int, udp_cksum) = 1;
SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
&VNET_NAME(udp_cksum), 0, "compute udp checksum");
int udp_log_in_vain = 0;
SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
@ -1212,7 +1212,7 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
/*
* Set up checksum and output datagram.
*/
if (udp_cksum) {
if (V_udp_cksum) {
if (inp->inp_flags & INP_ONESBCAST)
faddr.s_addr = INADDR_BROADCAST;
ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,

2
sys/netinet/udp_var.h
View File

@ -139,8 +139,10 @@ VNET_DECLARE(struct inpcbinfo, udbinfo);
extern u_long udp_sendspace;
extern u_long udp_recvspace;
VNET_DECLARE(int, udp_cksum);
VNET_DECLARE(struct udpstat, udpstat);
VNET_DECLARE(int, udp_blackhole);
#define V_udp_cksum VNET(udp_cksum)
#define V_udpstat VNET(udpstat)
#define V_udp_blackhole VNET(udp_blackhole)
extern int udp_log_in_vain;