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Groups > linux.kernel > #1167328

[PATCH 3.19.y-ckt 122/146] ipv6: fix ECMP route replacement

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.19.y-ckt 122/146] ipv6: fix ECMP route replacement
Date 2015-06-18 01:10 +0200
Message-ID <pCuD0-7ml-17@gated-at.bofh.it> (permalink)
References <pCu0i-6mo-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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3.19.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: =?UTF-8?q?Michal=20Kube=C4=8Dek?= <mkubecek@suse.cz>

commit 27596472473a02cfef2908a6bcda7e55264ba6b7 upstream.

When replacing an IPv6 multipath route with "ip route replace", i.e.
NLM_F_CREATE | NLM_F_REPLACE, fib6_add_rt2node() replaces only first
matching route without fixing its siblings, resulting in corrupted
siblings linked list; removing one of the siblings can then end in an
infinite loop.

IPv6 ECMP implementation is a bit different from IPv4 so that route
replacement cannot work in exactly the same way. This should be a
reasonable approximation:

1. If the new route is ECMP-able and there is a matching ECMP-able one
already, replace it and all its siblings (if any).

2. If the new route is ECMP-able and no matching ECMP-able route exists,
replace first matching non-ECMP-able (if any) or just add the new one.

3. If the new route is not ECMP-able, replace first matching
non-ECMP-able route (if any) or add the new route.

We also need to remove the NLM_F_REPLACE flag after replacing old
route(s) by first nexthop of an ECMP route so that each subsequent
nexthop does not replace previous one.

Fixes: 51ebd3181572 ("ipv6: add support of equal cost multipath (ECMP)")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/ipv6/ip6_fib.c | 39 +++++++++++++++++++++++++++++++++++++--
 net/ipv6/route.c   | 11 +++++++----
 2 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index f1c6d5e..3a96300 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -691,6 +691,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 {
 	struct rt6_info *iter = NULL;
 	struct rt6_info **ins;
+	struct rt6_info **fallback_ins = NULL;
 	int replace = (info->nlh &&
 		       (info->nlh->nlmsg_flags & NLM_F_REPLACE));
 	int add = (!info->nlh ||
@@ -714,8 +715,13 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 			    (info->nlh->nlmsg_flags & NLM_F_EXCL))
 				return -EEXIST;
 			if (replace) {
-				found++;
-				break;
+				if (rt_can_ecmp == rt6_qualify_for_ecmp(iter)) {
+					found++;
+					break;
+				}
+				if (rt_can_ecmp)
+					fallback_ins = fallback_ins ?: ins;
+				goto next_iter;
 			}
 
 			if (iter->dst.dev == rt->dst.dev &&
@@ -751,9 +757,17 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 		if (iter->rt6i_metric > rt->rt6i_metric)
 			break;
 
+next_iter:
 		ins = &iter->dst.rt6_next;
 	}
 
+	if (fallback_ins && !found) {
+		/* No ECMP-able route found, replace first non-ECMP one */
+		ins = fallback_ins;
+		iter = *ins;
+		found++;
+	}
+
 	/* Reset round-robin state, if necessary */
 	if (ins == &fn->leaf)
 		fn->rr_ptr = NULL;
@@ -814,6 +828,8 @@ add:
 		}
 
 	} else {
+		int nsiblings;
+
 		if (!found) {
 			if (add)
 				goto add;
@@ -834,8 +850,27 @@ add:
 			info->nl_net->ipv6.rt6_stats->fib_route_nodes++;
 			fn->fn_flags |= RTN_RTINFO;
 		}
+		nsiblings = iter->rt6i_nsiblings;
 		fib6_purge_rt(iter, fn, info->nl_net);
 		rt6_release(iter);
+
+		if (nsiblings) {
+			/* Replacing an ECMP route, remove all siblings */
+			ins = &rt->dst.rt6_next;
+			iter = *ins;
+			while (iter) {
+				if (rt6_qualify_for_ecmp(iter)) {
+					*ins = iter->dst.rt6_next;
+					fib6_purge_rt(iter, fn, info->nl_net);
+					rt6_release(iter);
+					nsiblings--;
+				} else {
+					ins = &iter->dst.rt6_next;
+				}
+				iter = *ins;
+			}
+			WARN_ON(nsiblings != 0);
+		}
 	}
 
 	return 0;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 11add92..efb491a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2483,11 +2483,14 @@ beginning:
 			}
 		}
 		/* Because each route is added like a single route we remove
-		 * this flag after the first nexthop (if there is a collision,
-		 * we have already fail to add the first nexthop:
-		 * fib6_add_rt2node() has reject it).
+		 * these flags after the first nexthop: if there is a collision,
+		 * we have already failed to add the first nexthop:
+		 * fib6_add_rt2node() has rejected it; when replacing, old
+		 * nexthops have been replaced by first new, the rest should
+		 * be added to it.
 		 */
-		cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
+		cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
+						     NLM_F_REPLACE);
 		rtnh = rtnh_next(rtnh, &remaining);
 	}
 
-- 
1.9.1

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  [PATCH 3.19.y-ckt 098/146] powerpc: Align TOC to 256 bytes Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:30 +0200
  [PATCH 3.19.y-ckt 101/146] mmc: atmel-mci: fix bad variable type for clkdiv Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
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  [PATCH 3.19.y-ckt 122/146] ipv6: fix ECMP route replacement Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
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  [PATCH 3.19.y-ckt 114/146] net: sched: fix call_rcu() race on classifier module unloads Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:20 +0200
  [PATCH 3.19.y-ckt 055/146] x86/vdso: Fix 'make bzImage' on older distros Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:20 +0200
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  [PATCH 3.19.y-ckt 097/146] Input: elantech - fix semi-mt protocol for v3 HW Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:30 +0200
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  [PATCH 3.19.y-ckt 094/146] ASoC: wm8994: correct BCLK DIV 348 to 384 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:30 +0200
  [PATCH 3.19.y-ckt 075/146] thermal: rockchip: fix an error code Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:30 +0200
  [PATCH 3.19.y-ckt 064/146] ext4: fix NULL pointer dereference when journal restart fails Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:30 +0200
  [PATCH 3.19.y-ckt 069/146] igb: Fix oops on changing number of rings Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:30 +0200
  [PATCH 3.19.y-ckt 071/146] spi: bitbang: Make setup_transfer() callback optional Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:30 +0200
  [PATCH 3.19.y-ckt 044/146] xhci: fix isoc endpoint dequeue from advancing too far on transaction error Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 051/146] tty/n_gsm.c: fix a memory leak when gsmtty is removed Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 030/146] USB: pl2303: Remove support for Samsung I330 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 047/146] ARC: unbork !LLSC build Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 066/146] jbd2: fix r_count overflows leading to buffer overflow in journal recovery Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 046/146] xhci: gracefully handle xhci_irq dead device Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 048/146] staging: gdm724x: Correction of variable usage after applying ALIGN() Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 058/146] drm/radeon: fix VM_CONTEXT*_PAGE_TABLE_END_ADDR handling Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 054/146] x86/vdso: Fix the x86 vdso2c tool includes Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 062/146] net: phy: micrel: Fix regression in kszphy_probe Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 027/146] usb: gadget: configfs: Fix interfaces array NULL-termination Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 045/146] xhci: Solve full event ring by increasing TRBS_PER_SEGMENT to 256 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 028/146] rtlwifi: rtl8192cu: Fix kernel deadlock Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
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  [PATCH 3.19.y-ckt 041/146] staging: vt6655: Fix 80211 control and management status reporting. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 061/146] parisc,metag: Fix crashes due to stack randomization on stack-grows-upwards architectures Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 068/146] mm, numa: really disable NUMA balancing by default on single node machines Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 039/146] staging: vt6656: use ieee80211_tx_info to select packet type. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 032/146] net: can: xilinx_can: fix extended frame handling Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 072/146] iwlwifi: pcie: prevent using unmapped memory in fw monitor Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 034/146] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 049/146] usb-storage: Add NO_WP_DETECT quirk for Lacie 059f:0651 devices Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 057/146] net: qca_spi: Fix possible race during probe Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 050/146] ahci: avoton port-disable reset-quirk Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 037/146] md/raid5: don't record new size if resize_stripes fails. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 040/146] staging: vt6655: device_free_tx_buf use only ieee80211_tx_status_irqsafe Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 042/146] staging: vt6655: lock MACvWriteBSSIDAddress. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 060/146] drm/radeon: add new bonaire pci id Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 035/146] libata: Blacklist queued TRIM on all Samsung 800-series Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 053/146] ARM: net fix emit_udiv() for BPF_ALU | BPF_DIV | BPF_K intruction. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 031/146] USB: visor: Match I330 phone more precisely Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 043/146] arm64: bpf: fix signedness bug in loading 64-bit immediate Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:40 +0200
  [PATCH 3.19.y-ckt 018/146] iio: light: hid-sensor-prox: Fix modifier Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 003/146] ozwpan: Use proper check to prevent heap overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 001/146] ozwpan: Use unsigned ints to prevent heap overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 022/146] iio: adc: xilinx: Fix VREFP scale Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 012/146] x86: vdso: fix pvclock races with task migration Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 020/146] iio: adc: xilinx: Fix register addresses Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 023/146] iio: adc: xilinx: Fix VREFN sign Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 021/146] iio: adc: xilinx: Fix "vccaux" channel .address Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 025/146] libata: Ignore spurious PHY event on LPM policy change Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 004/146] ozwpan: unchecked signed subtraction leads to DoS Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 008/146] HID: add quirk for PIXART OEM mouse used by HP Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 002/146] ozwpan: divide-by-zero leading to panic Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 005/146] x86: kvm: Revert "remove sched notifier for cross-cpu migrations" Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 026/146] iio:st_sensors: Fix oops when probing SPI devices Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 014/146] jhash: Update jhash_[321]words functions to use correct initval Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 029/146] USB: cp210x: add ID for KCF Technologies PRN device Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 016/146] bridge/mdb: remove wrong use of NLM_F_MULTI Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 013/146] nfsd: fix nsfd startup race triggering BUG_ON Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 007/146] HID: add HP OEM mouse to quirk ALWAYS_POLL Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 019/146] iio: pressure: hid-sensor-press: Fix modifier Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 011/146] usb: isp1760: hcd: use new USB_RESUME_TIMEOUT Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 017/146] iio/axp288_adc: add missing channel info mask Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200
  [PATCH 3.19.y-ckt 010/146] usb: dwc2: hcd: use new USB_RESUME_TIMEOUT Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:50 +0200

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