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selftests: net: test IPV6_HOPLIMIT 

Test setting IPV6_HOPLIMIT via setsockopt and cmsg
across socket types.

Output without the kernel support (this series):

  Case HOPLIMIT ICMP cmsg - packet data returned 1, expected 0
  Case HOPLIMIT ICMP diff - packet data returned 1, expected 0

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-02-16 17:21:19 -08:00 committed by David S. Miller
parent 9657ad09e1
commit 05ae83d5a4
2 changed files with 49 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
tools/testing/selftests/net/cmsg_ipv6.sh
View File

@ -106,6 +106,37 @@ for ovr in setsock cmsg both diff; do
done
done
# IPV6_HOPLIMIT
LIM=4
for ovr in setsock cmsg both diff; do
for p in u i r; do
[ $p == "u" ] && prot=UDP
[ $p == "i" ] && prot=ICMP
[ $p == "r" ] && prot=RAW
[ $ovr == "setsock" ] && m="-L"
[ $ovr == "cmsg" ] && m="-l"
[ $ovr == "both" ] && m="-L $LIM -l"
[ $ovr == "diff" ] && m="-L $((LIM + 1)) -l"
$NSEXE nohup tcpdump --immediate-mode -p -ni dummy0 -w $TMPF -c 4 2> /dev/null &
BG=$!
sleep 0.05
$NSEXE ./cmsg_sender -6 -p $p $m $LIM $TGT6 1234
check_result $? 0 "HOPLIMIT $prot $ovr - pass"
while [ -d /proc/$BG ]; do
$NSEXE ./cmsg_sender -6 -p u $TGT6 1234
done
tcpdump -r $TMPF -v 2>&1 | grep "hlim $LIM[^0-9]" >> /dev/null
check_result $? 0 "HOPLIMIT $prot $ovr - packet data"
rm $TMPF
done
done
# Summary
if [ $BAD -ne 0 ]; then
echo "FAIL - $BAD/$TOTAL cases failed"

19
tools/testing/selftests/net/cmsg_sender.c
View File

@ -47,6 +47,7 @@ struct options {
unsigned int mark;
unsigned int dontfrag;
unsigned int tclass;
unsigned int hlimit;
} sockopt;
struct {
unsigned int family;
@ -64,6 +65,7 @@ struct options {
struct {
struct option_cmsg_u32 dontfrag;
struct option_cmsg_u32 tclass;
struct option_cmsg_u32 hlimit;
} v6;
} opt = {
.size = 13,
@ -95,6 +97,8 @@ static void __attribute__((noreturn)) cs_usage(const char *bin)
"\t\t-F val Set don't fragment via setsockopt\n"
"\t\t-c val Set TCLASS via cmsg\n"
"\t\t-C val Set TCLASS via setsockopt\n"
"\t\t-l val Set HOPLIMIT via cmsg\n"
"\t\t-L val Set HOPLIMIT via setsockopt\n"
"");
exit(ERN_HELP);
}
@ -103,7 +107,7 @@ static void cs_parse_args(int argc, char *argv[])
{
char o;
while ((o = getopt(argc, argv, "46sS:p:m:M:d:tf:F:c:C:")) != -1) {
while ((o = getopt(argc, argv, "46sS:p:m:M:d:tf:F:c:C:l:L:")) != -1) {
switch (o) {
case 's':
opt.silent_send = true;
@ -158,6 +162,13 @@ static void cs_parse_args(int argc, char *argv[])
case 'C':
opt.sockopt.tclass = atoi(optarg);
break;
case 'l':
opt.v6.hlimit.ena = true;
opt.v6.hlimit.val = atoi(optarg);
break;
case 'L':
opt.sockopt.hlimit = atoi(optarg);
break;
}
}
@ -215,6 +226,8 @@ cs_write_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
SOL_IPV6, IPV6_DONTFRAG, &opt.v6.dontfrag);
ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len,
SOL_IPV6, IPV6_TCLASS, &opt.v6.tclass);
ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len,
SOL_IPV6, IPV6_HOPLIMIT, &opt.v6.hlimit);
if (opt.txtime.ena) {
struct sock_txtime so_txtime = {
@ -360,6 +373,10 @@ static void ca_set_sockopts(int fd)
setsockopt(fd, SOL_IPV6, IPV6_TCLASS,
&opt.sockopt.tclass, sizeof(opt.sockopt.tclass)))
error(ERN_SOCKOPT, errno, "setsockopt IPV6_TCLASS");
if (opt.sockopt.hlimit &&
setsockopt(fd, SOL_IPV6, IPV6_UNICAST_HOPS,
&opt.sockopt.hlimit, sizeof(opt.sockopt.hlimit)))
error(ERN_SOCKOPT, errno, "setsockopt IPV6_HOPLIMIT");
}
int main(int argc, char *argv[])