[PATCH] pktgen: initialize IP ID field

[Eric Dumazet <eric.dumazet@gmail.com>]

While playing with pktgen, I realized IP ID was not filled and a random value
was taken, possibly leaking 2 bytes of kernel memory.

We can use an increasing ID, this can help diagnostics anyway.


Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 1da0e03..59396a5 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -335,6 +335,7 @@ struct pktgen_dev {
 	__u32 cur_src_mac_offset;
 	__be32 cur_saddr;
 	__be32 cur_daddr;
+	__u16 ip_id;
 	__u16 cur_udp_dst;
 	__u16 cur_udp_src;
 	__u16 cur_queue_map;
@@ -2630,6 +2631,8 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 	iph->protocol = IPPROTO_UDP;	/* UDP */
 	iph->saddr = pkt_dev->cur_saddr;
 	iph->daddr = pkt_dev->cur_daddr;
+	iph->id = htons(pkt_dev->ip_id);
+	pkt_dev->ip_id++;
 	iph->frag_off = 0;
 	iplen = 20 + 8 + datalen;
 	iph->tot_len = htons(iplen);