From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shmulik Ladkani Subject: [PATCH 1/2] net/ipv4: Introduce IPSKB_FRAG_SEGS bit to inet_skb_parm.flags Date: Mon, 18 Jul 2016 14:49:33 +0300 Message-ID: <1468842574-1243-2-git-send-email-shmulik.ladkani@gmail.com> References: <1468842574-1243-1-git-send-email-shmulik.ladkani@gmail.com> Cc: shmulik.ladkani@ravellosystems.com, Eric Dumazet , shmulik.ladkani@gmail.com, Hannes Frederic Sowa , Florian Westphal To: "David S . Miller" , netdev@vger.kernel.org Return-path: Received: from userp1040.oracle.com ([156.151.31.81]:31911 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751560AbcGRLup (ORCPT ); Mon, 18 Jul 2016 07:50:45 -0400 In-Reply-To: <1468842574-1243-1-git-send-email-shmulik.ladkani@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: This flag indicates whether fragmentation of segments is allowed. Formerly this policy was hardcoded according to IPSKB_FORWARDED (set by either ip_forward or ipmr_forward). Cc: Hannes Frederic Sowa Cc: Florian Westphal Signed-off-by: Shmulik Ladkani --- include/net/ip.h | 1 + net/ipv4/ip_forward.c | 2 +- net/ipv4/ip_output.c | 6 ++++-- net/ipv4/ipmr.c | 2 +- 4 files changed, 7 insertions(+), 4 deletions(-) diff --git a/include/net/ip.h b/include/net/ip.h index 08f36cd..9742b92 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -47,6 +47,7 @@ struct inet_skb_parm { #define IPSKB_REROUTED BIT(4) #define IPSKB_DOREDIRECT BIT(5) #define IPSKB_FRAG_PMTU BIT(6) +#define IPSKB_FRAG_SEGS BIT(7) u16 frag_max_size; }; diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c index 9f0a7b9..8b4ffd2 100644 --- a/net/ipv4/ip_forward.c +++ b/net/ipv4/ip_forward.c @@ -117,7 +117,7 @@ int ip_forward(struct sk_buff *skb) if (opt->is_strictroute && rt->rt_uses_gateway) goto sr_failed; - IPCB(skb)->flags |= IPSKB_FORWARDED; + IPCB(skb)->flags |= IPSKB_FORWARDED | IPSKB_FRAG_SEGS; mtu = ip_dst_mtu_maybe_forward(&rt->dst, true); if (ip_exceeds_mtu(skb, mtu)) { IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index e23f141..dde37fb 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -223,8 +223,10 @@ static int ip_finish_output_gso(struct net *net, struct sock *sk, struct sk_buff *segs; int ret = 0; - /* common case: locally created skb or seglen is <= mtu */ - if (((IPCB(skb)->flags & IPSKB_FORWARDED) == 0) || + /* common case: fragmentation of segments is not allowed, + * or seglen is <= mtu + */ + if (((IPCB(skb)->flags & IPSKB_FRAG_SEGS) == 0) || skb_gso_validate_mtu(skb, mtu)) return ip_finish_output2(net, sk, skb); diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index e0d76f5..eec2341 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -1749,7 +1749,7 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, vif->dev->stats.tx_bytes += skb->len; } - IPCB(skb)->flags |= IPSKB_FORWARDED; + IPCB(skb)->flags |= IPSKB_FORWARDED | IPSKB_FRAG_SEGS; /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally * not only before forwarding, but after forwarding on all output -- 1.9.1