From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fan Du Subject: [PATCH RFC 3/5] {pktgen,xfrm} Construct skb dst for tunnel mode transformation Date: Thu, 5 Dec 2013 15:57:17 +0800 Message-ID: <1386230239-31860-4-git-send-email-fan.du@windriver.com> References: <1386230239-31860-1-git-send-email-fan.du@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: To: , Return-path: Received: from mail.windriver.com ([147.11.1.11]:62074 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752690Ab3LEH52 (ORCPT ); Thu, 5 Dec 2013 02:57:28 -0500 In-Reply-To: <1386230239-31860-1-git-send-email-fan.du@windriver.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- net/core/pktgen.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 3e0a00f..c30df28 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -388,7 +388,8 @@ struct pktgen_dev { #ifdef CONFIG_XFRM __u32 spi; - + struct dst_entry dst, child; + struct dst_ops dstops; #endif char result[512]; }; @@ -2485,6 +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; @@ -2493,6 +2499,8 @@ 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); @@ -3547,7 +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 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->child.dev = pkt_dev->odev; + dst_init_metrics(&pkt_dev->child, pktgen_dst_metrics, false); + pkt_dev->dst.child = &pkt_dev->child; + pkt_dev->dst.ops = &pkt_dev->dstops; #endif return add_dev_to_thread(t, pkt_dev); -- 1.7.9.5