Commit 05ae83d5 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

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: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9657ad09

tools/testing/selftests/net/cmsg_ipv6.sh

+31 −0
Original line number Diff line number Diff line
@@ -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"

tools/testing/selftests/net/cmsg_sender.c

+18 −1
Original line number Diff line number Diff line
@@ -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[])