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* [PATCH] systemd: networkd: backport ipv4ll fixes from upstream
@ 2017-04-03 17:47 Jason Reeder
  2017-04-03 17:51 ` Denys Dmytriyenko
  0 siblings, 1 reply; 2+ messages in thread
From: Jason Reeder @ 2017-04-03 17:47 UTC (permalink / raw)
  To: meta-arago

This commit adds three backported commits from upstream
systemd that corrects ipv4ll bugs for compliance testing.

https://github.com/systemd/systemd/pull/5361
https://github.com/systemd/systemd/pull/5589

Signed-off-by: Jason Reeder <jreeder@ti.com>
---
 ...emd-network-ipv4ll-probe-conflict-counter.patch | 48 ++++++++++++++++++
 ...network-sd-ipv4ll-Wrapper-to-restart-addr.patch | 53 +++++++++++++++++++
 ...network-sd-ipv4ll-acquire-new-address-aft.patch | 59 ++++++++++++++++++++++
 .../recipes-core/systemd/systemd_%.bbappend        |  3 ++
 4 files changed, 163 insertions(+)
 create mode 100644 meta-arago-distro/recipes-core/systemd/systemd/0001-libsystemd-network-ipv4ll-probe-conflict-counter.patch
 create mode 100644 meta-arago-distro/recipes-core/systemd/systemd/0002-libsystemd-network-sd-ipv4ll-Wrapper-to-restart-addr.patch
 create mode 100644 meta-arago-distro/recipes-core/systemd/systemd/0003-libsystemd-network-sd-ipv4ll-acquire-new-address-aft.patch

diff --git a/meta-arago-distro/recipes-core/systemd/systemd/0001-libsystemd-network-ipv4ll-probe-conflict-counter.patch b/meta-arago-distro/recipes-core/systemd/systemd/0001-libsystemd-network-ipv4ll-probe-conflict-counter.patch
new file mode 100644
index 0000000..557a297
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/0001-libsystemd-network-ipv4ll-probe-conflict-counter.patch
@@ -0,0 +1,48 @@
+From 1e47842a0144c501cc6fd7ccc7996761f3e32ea9 Mon Sep 17 00:00:00 2001
+From: Jason Reeder <jasonreeder@gmail.com>
+Date: Mon, 3 Apr 2017 12:07:17 -0500
+Subject: [PATCH 1/3] libsystemd-network: ipv4ll probe conflict counter
+
+A bug exists where the conflict counter is cleared
+regardless of whether or not the next probe attempt leads to
+a successful address acquisition. This causes 'bursts' of
+MAX_CONFLICTS probes followed by a delay of
+RATE_LIMIT_INTERVAL instead of a single probe each
+RATE_LIMIT_INTERVAL when beyond MAX_CONFLICTS.
+
+The conflict counter should only be cleared after an
+address is successfully acquired. This commit achieves that
+goal.
+
+From RFC3927:
+A host should maintain a counter of the number of address
+conflicts it has experienced in the process of trying to
+acquire an address, and if the number of conflicts exceeds
+MAX_CONFLICTS then the host MUST limit the rate at which it
+probes for new addresses to no more than one new address per
+RATE_LIMIT_INTERVAL.  This is to prevent catastrophic ARP
+storms in pathological failure cases, such as a rogue host
+that answers all ARP probes, causing legitimate hosts to go
+into an infinite loop attempting to select a usable address.
+
+Signed-off-by: Jason Reeder <jasonreeder@gmail.com>
+---
+ src/libsystemd-network/sd-ipv4acd.c | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/src/libsystemd-network/sd-ipv4acd.c b/src/libsystemd-network/sd-ipv4acd.c
+index cc7436d..97f37f2 100644
+--- a/src/libsystemd-network/sd-ipv4acd.c
++++ b/src/libsystemd-network/sd-ipv4acd.c
+@@ -249,8 +249,6 @@ static int ipv4acd_on_timeout(sd_event_source *s, uint64_t usec, void *userdata)
+                         r = ipv4acd_set_next_wakeup(ll, RATE_LIMIT_INTERVAL, PROBE_WAIT);
+                         if (r < 0)
+                                 goto out;
+-
+-                        ll->conflict = 0;
+                 } else {
+                         r = ipv4acd_set_next_wakeup(ll, 0, PROBE_WAIT);
+                         if (r < 0)
+-- 
+1.9.1
+
diff --git a/meta-arago-distro/recipes-core/systemd/systemd/0002-libsystemd-network-sd-ipv4ll-Wrapper-to-restart-addr.patch b/meta-arago-distro/recipes-core/systemd/systemd/0002-libsystemd-network-sd-ipv4ll-Wrapper-to-restart-addr.patch
new file mode 100644
index 0000000..8929f22
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/0002-libsystemd-network-sd-ipv4ll-Wrapper-to-restart-addr.patch
@@ -0,0 +1,53 @@
+From 920ece8950b1422c80cf3235626d78646c6cc88a Mon Sep 17 00:00:00 2001
+From: Jason Reeder <jasonreeder@gmail.com>
+Date: Mon, 3 Apr 2017 12:15:55 -0500
+Subject: [PATCH 2/3] libsystemd-network: sd-ipv4ll: Wrapper to restart address
+ acquisition after conflict
+
+After an ipv4ll claimed address conflict occurs a new address needs
+to be chosen and then the acquisition state machine needs to be
+restarted.
+
+This commit adds a function (sd_ipv4ll_restart) that clears the
+previously acquired address (ll->address) and then calls the existing
+sd_ipv4ll_start function to choose the new address and start the
+acquisition.
+
+Signed-off-by: Jason Reeder <jasonreeder@gmail.com>
+---
+ src/libsystemd-network/sd-ipv4ll.c | 6 ++++++
+ src/systemd/sd-ipv4ll.h            | 1 +
+ 2 files changed, 7 insertions(+)
+
+diff --git a/src/libsystemd-network/sd-ipv4ll.c b/src/libsystemd-network/sd-ipv4ll.c
+index 2a06418..2996516 100644
+--- a/src/libsystemd-network/sd-ipv4ll.c
++++ b/src/libsystemd-network/sd-ipv4ll.c
+@@ -289,6 +289,12 @@ static int ipv4ll_pick_address(sd_ipv4ll *ll) {
+         return 0;
+ }
+ 
++int sd_ipv4ll_restart(sd_ipv4ll *ll) {
++        ll->address = 0;
++
++        return sd_ipv4ll_start(ll);
++}
++
+ int sd_ipv4ll_start(sd_ipv4ll *ll) {
+         int r;
+ 
+diff --git a/src/systemd/sd-ipv4ll.h b/src/systemd/sd-ipv4ll.h
+index 6fa38a2..7c54979 100644
+--- a/src/systemd/sd-ipv4ll.h
++++ b/src/systemd/sd-ipv4ll.h
+@@ -47,6 +47,7 @@ int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index);
+ int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address);
+ int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, unsigned seed);
+ int sd_ipv4ll_is_running(sd_ipv4ll *ll);
++int sd_ipv4ll_restart(sd_ipv4ll *ll);
+ int sd_ipv4ll_start(sd_ipv4ll *ll);
+ int sd_ipv4ll_stop(sd_ipv4ll *ll);
+ sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll);
+-- 
+1.9.1
+
diff --git a/meta-arago-distro/recipes-core/systemd/systemd/0003-libsystemd-network-sd-ipv4ll-acquire-new-address-aft.patch b/meta-arago-distro/recipes-core/systemd/systemd/0003-libsystemd-network-sd-ipv4ll-acquire-new-address-aft.patch
new file mode 100644
index 0000000..9cb4908
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/0003-libsystemd-network-sd-ipv4ll-acquire-new-address-aft.patch
@@ -0,0 +1,59 @@
+From d3a4823b019a27bd9387216dcb94360bc432590e Mon Sep 17 00:00:00 2001
+From: Jason Reeder <jasonreeder@gmail.com>
+Date: Mon, 3 Apr 2017 12:16:58 -0500
+Subject: [PATCH 3/3] libsystemd-network: sd-ipv4ll: acquire new address after
+ claimed address conflict
+
+If a conflict occurs on a claimed ipv4ll address, the device releases
+the address and then does not attempt to acquire a new ipv4ll
+address. According to RFC3927, releasing the address in this
+situation is correct. However, this should be followed by an attempt
+to configure a new ipv4ll address.
+
+This commit restarts the ipv4ll address acquisition state machine
+after releasing the conflicting address.
+
+From RFC3927 Section 2.5 conflict defense method (b):
+...
+However, if this is not the first conflicting ARP packet the host has
+seen, and the time recorded for the previous conflicting ARP packet is
+recent, within DEFEND_INTERVAL seconds, then the host MUST immediately
+cease using this address and configure a new IPv4 Link-Local address
+as described above.
+...
+
+Signed-off-by: Jason Reeder <jasonreeder@gmail.com>
+---
+ src/network/networkd-ipv4ll.c | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
+index ae323d5..10f25f0 100644
+--- a/src/network/networkd-ipv4ll.c
++++ b/src/network/networkd-ipv4ll.c
+@@ -178,12 +178,22 @@ static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
+ 
+         switch(event) {
+                 case SD_IPV4LL_EVENT_STOP:
++                        r = ipv4ll_address_lost(link);
++                        if (r < 0) {
++                                link_enter_failed(link);
++                                return;
++                        }
++                        break;
+                 case SD_IPV4LL_EVENT_CONFLICT:
+                         r = ipv4ll_address_lost(link);
+                         if (r < 0) {
+                                 link_enter_failed(link);
+                                 return;
+                         }
++
++                        r = sd_ipv4ll_restart(ll);
++                        if (r < 0)
++                                log_link_warning(link, "Could not acquire IPv4 link-local address");
+                         break;
+                 case SD_IPV4LL_EVENT_BIND:
+                         r = ipv4ll_address_claimed(ll, link);
+-- 
+1.9.1
+
diff --git a/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend b/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend
index 123d1ad..8fccdb5 100644
--- a/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend
+++ b/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend
@@ -14,6 +14,9 @@ SRC_URI_append = " \
     file://30-wlan.network \
     file://60-usb.network \
     file://sync-clocks.service \
+    file://0001-libsystemd-network-ipv4ll-probe-conflict-counter.patch \
+    file://0002-libsystemd-network-sd-ipv4ll-Wrapper-to-restart-addr.patch \
+    file://0003-libsystemd-network-sd-ipv4ll-acquire-new-address-aft.patch \
 "
 
 do_install_append() {
-- 
1.9.1



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2017-04-03 17:47 [PATCH] systemd: networkd: backport ipv4ll fixes from upstream Jason Reeder
2017-04-03 17:51 ` Denys Dmytriyenko

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