@@ -388,6 +388,8 @@ struct pktgen_dev {
#ifdef CONFIG_XFRM
__u32 spi;
+ struct dst_entry dst;
+ struct dst_ops dstops;
#endif
char result[512];
};
@@ -2484,6 +2486,11 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
#ifdef CONFIG_XFRM
+u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
+
+ [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
+};
+
static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
{
struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
@@ -2492,6 +2499,9 @@ static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
if (!x)
return 0;
+ if (x->props.mode == XFRM_MODE_TUNNEL)
+ __skb_dst_set_noref(skb, &pkt_dev->dst, true);
+
spin_lock(&x->lock);
err = x->outer_mode->output(x, skb);
@@ -3545,6 +3555,16 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
goto out2;
}
#ifdef CONFIG_XFRM
+ /* xfrm tunnel mode needs additional dst to extract outter
+ * ip header protocol/ttl/id field, here creat a phony one.
+ * instead of looking for a valid rt, which definitely hurting
+ * performance under such circumstance.
+ */
+ pkt_dev->dstops.family = AF_INET;
+ pkt_dev->dst.dev = pkt_dev->odev;
+ dst_init_metrics(&pkt_dev->dst, pktgen_dst_metrics, false);
+ pkt_dev->dst.child = &pkt_dev->dst;
+ pkt_dev->dst.ops = &pkt_dev->dstops;
#endif
return add_dev_to_thread(t, pkt_dev);
IPsec tunnel mode encapuslation needs to set outter ip header with right protocol/ttl/id value with regard to skb->dst->child. Looking up a rt in a standard way is absolutely wrong for every packet transmission. In a simple way, construct a dst by setting neccessary information to make tunnel mode encapuslation working. Signed-off-by: Fan Du <fan.du@windriver.com> --- v2: -Point dst->child into dst itself to save space. --- net/core/pktgen.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)