testsuite: Generate nlmsg blob at runtime

Since netlink messages are in host byte order, shipping a pre-generated
nlmsg blob won't suffice on systems with different endianness. Therefore
generate the blob at runtime, so it's content fits the hosts endianness.

Note that the generated message will contain only a single interface
featuring two VFs instead of the full list before. Yet this is
sufficient, as it triggers the crash with iproute versions prior to
commit 8c29ae7cc2494 ("ip link: Fix crash on older kernels when show VF
dev").

Signed-off-by: Phil Sutter <phil@nwl.cc>

1 files changed, 116 insertions, 0 deletions

diff --git a/testsuite/tools/generate_nlmsg.c b/testsuite/tools/generate_nlmsg.c
new file mode 100644
index 00000000..fe96f262
--- /dev/null
+++ b/testsuite/tools/generate_nlmsg.c
@@ -0,0 +1,116 @@
+/*
+ * generate_nlmsg.c	Testsuite helper generating nlmsg blob
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Phil Sutter <phil@nwl.cc>
+ */
+
+#include <netinet/ether.h>
+#include <libnetlink.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <errno.h>
+#include <stdio.h>
+
+int fill_vf_rate_test(void *buf, size_t buflen)
+{
+	char bcmac[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+	struct ifla_vf_mac vf_mac = {
+		.mac = { 0x0, 0x26, 0x6c, 0xff, 0xb5, 0xc0 },
+	};
+	struct ifla_vf_link_state vf_link_state = { 0 };
+	struct ifla_vf_tx_rate vf_tx_rate = { 0 };
+	struct ifla_vf_spoofchk vf_spoofchk = {
+		.setting = 1,
+	};
+	struct ifla_vf_vlan vf_vlan = { 0 };
+	struct rtattr *vfinfo_list, *vfinfo;
+	struct nlmsghdr *h = buf;
+	struct ifinfomsg *ifi;
+
+	h->nlmsg_type = RTM_NEWLINK;
+	h->nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
+
+	ifi = NLMSG_DATA(h);
+	ifi->ifi_type = ARPHRD_ETHER;
+	ifi->ifi_index = 1;
+	ifi->ifi_flags = IFF_RUNNING | IFF_BROADCAST |
+			 IFF_MULTICAST | IFF_UP | IFF_LOWER_UP;
+
+#define ASSERT(x) if (x < 0) return -1
+#define ATTR_L(t, v, l)	ASSERT(addattr_l(h, buflen, t, v, l))
+#define ATTR_8(t, v)	ASSERT(addattr8(h, buflen, t, v))
+#define ATTR_32(t, v)	ASSERT(addattr32(h, buflen, t, v))
+#define ATTR_STRZ(t, v)	ASSERT(addattrstrz(h, buflen, t, v))
+
+#define NEST(t) addattr_nest(h, buflen, t)
+#define NEST_END(t) addattr_nest_end(h, t)
+
+	ATTR_STRZ(IFLA_IFNAME, "eth0");
+	ATTR_32(IFLA_TXQLEN, 10000);
+	ATTR_8(IFLA_OPERSTATE, 6);
+	ATTR_8(IFLA_LINKMODE, 0);
+	ATTR_32(IFLA_MTU, 9000);
+	ATTR_32(IFLA_GROUP, 0);
+	ATTR_32(IFLA_PROMISCUITY, 0);
+	ATTR_32(IFLA_NUM_TX_QUEUES, 8);
+	ATTR_32(IFLA_NUM_RX_QUEUES, 8);
+	ATTR_8(IFLA_CARRIER, 1);
+	ATTR_STRZ(IFLA_QDISC, "mq");
+	ATTR_L(IFLA_ADDRESS, vf_mac.mac, ETH_ALEN);
+	ATTR_L(IFLA_BROADCAST, bcmac, sizeof(bcmac));
+	ATTR_32(IFLA_NUM_VF, 2);
+
+	vfinfo_list = NEST(IFLA_VFINFO_LIST);
+
+	vfinfo = NEST(IFLA_VF_INFO);
+	ATTR_L(IFLA_VF_MAC, &vf_mac, sizeof(vf_mac));
+	ATTR_L(IFLA_VF_VLAN, &vf_vlan, sizeof(vf_vlan));
+	ATTR_L(IFLA_VF_TX_RATE, &vf_tx_rate, sizeof(vf_tx_rate));
+	ATTR_L(IFLA_VF_SPOOFCHK, &vf_spoofchk, sizeof(vf_spoofchk));
+	ATTR_L(IFLA_VF_LINK_STATE, &vf_link_state, sizeof(vf_link_state));
+	NEST_END(vfinfo);
+
+	vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = 1;
+	vf_spoofchk.vf = vf_link_state.vf = 1;
+
+	vfinfo = NEST(IFLA_VF_INFO);
+	ATTR_L(IFLA_VF_MAC, &vf_mac, sizeof(vf_mac));
+	ATTR_L(IFLA_VF_VLAN, &vf_vlan, sizeof(vf_vlan));
+	ATTR_L(IFLA_VF_TX_RATE, &vf_tx_rate, sizeof(vf_tx_rate));
+	ATTR_L(IFLA_VF_SPOOFCHK, &vf_spoofchk, sizeof(vf_spoofchk));
+	ATTR_L(IFLA_VF_LINK_STATE, &vf_link_state, sizeof(vf_link_state));
+	NEST_END(vfinfo);
+
+	NEST_END(vfinfo_list);
+
+	return h->nlmsg_len;
+}
+
+int main(void)
+{
+	char buf[16384] = { 0 };
+	int msglen;
+	FILE *fp;
+
+	msglen = fill_vf_rate_test(buf, sizeof(buf));
+	if (msglen < 0) {
+		fprintf(stderr, "fill_vf_rate_test() failed!\n");
+		return 1;
+	}
+	fp = fopen("tests/ip/link/dev_wo_vf_rate.nl", "w");
+	if (!fp) {
+		perror("fopen()");
+		return 1;
+	}
+	if (fwrite(buf, msglen, 1, fp) != 1) {
+		perror("fwrite()");
+		return 1;
+	}
+	fclose(fp);
+	return 0;
+}