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Fernando Fernandez Mancera 8f9b2f22bb bonding: send ARP announcement on bonding-slb link/carrier down 
When a bond in balance-slb is created, the ports are enabled or disabled
based on carrier and link state. If the link/carrier goes down, the port
becomes disabled and we must make sure the MAC tables of the switches
are updated properly so the traffic is redirected.

In order to solve this, we send a GARP or RARP broadcast packet on the
bond. This fix cover 3 different balance-slb scenarios.

Scenario 1: The bond in balance-slb mode has IPv4 address configured and
some ports connected. Here the bond is acting like active-backup as the
packets will always have as source MAC the address of the bond
interface. When a port goes down, NetworkManager will send a GARP
broadcast announcing the address configured on the bond with the MAC
address configured on the port.

Scenario 2: The bond in balance-slb mode is connected to a bridge and has
some ports connected. The bridge has IPv4 configured. When a port goes
down, NetworkManager will send a GARP broadcast announcing the address
configured on the bridge with the MAC address configured on the port.

Scenario 3: The bond in balance-slb mode is connected to a bridge and
has some ports connected. The bridge does not have IP configuration and
therefore everything is L2. When a port goes down, NetworkManager will
query the FDB table and filter the entries by the ones belonging to the
bridge and the bond ifindexes. Then, it will send a RARP broadcast
announcing every learned MAC address from FDB.

Fixes: e9268e3924 ('firewall: add mlag firewall utils for multi chassis link aggregation (MLAG) for bonding-slb')
(cherry picked from commit 3f2f922dd9)
(cherry picked from commit e9e1768c37)
2024-12-23 13:02:56 +01:00
..
c-list c-list: re-import git-subtree for 'src/c-list' 2022-07-19 09:02:36 +02:00
c-rbtree c-rbtree: re-import git-subtree for 'src/c-rbtree' 2022-11-23 18:00:31 +01:00
c-siphash c-siphash: re-import git-subtree for 'src/c-siphash' 2022-11-23 18:00:33 +01:00
c-stdaux c-stdaux: re-import git-subtree for 'src/c-stdaux' 2023-03-03 13:40:38 +01:00
contrib all: use nm_strv_empty_new() helper 2023-11-30 15:53:21 +01:00
core bonding: send ARP announcement on bonding-slb link/carrier down 2024-12-23 13:02:56 +01:00
libnm-base Updated code format 2024-04-08 06:35:20 +00:00
libnm-client-aux-extern all: use nm_random_*() instead of g_random_*() 2023-01-30 10:51:13 +01:00
libnm-client-impl hsr: fix initialization of port1 and port2 DBus Object property 2024-10-04 12:36:08 +02:00
libnm-client-public HSR: add support to HSR/PRP interface 2023-12-05 08:05:56 +01:00
libnm-client-test all: use G_SPAWN_CLOEXEC_PIPES with g_spawn_async_with_pipes() 2023-04-04 08:43:20 +02:00
libnm-core-aux-extern dispatcher: support device-handler actions 2024-02-21 11:16:04 +01:00
libnm-core-aux-intern libnm,nmcli: add ipvx.dhcp-dscp property 2024-02-06 14:24:39 +01:00
libnm-core-impl libnm-core: fix validation of ovs-dpdk interface name 2024-09-26 09:51:26 +02:00
libnm-core-intern src: drop most master references from the code 2024-08-09 16:53:17 +02:00
libnm-core-public dbus-interface: rename activation flag to use conscious language 2024-08-09 16:53:17 +02:00
libnm-crypto Updated code format 2024-04-08 06:35:20 +00:00
libnm-glib-aux glib-aux: add nm_ether_addr_hash() helper 2024-12-23 13:02:56 +01:00
libnm-lldp lldp: fix multiple access to argument in logging macro 2024-08-19 15:21:53 +02:00
libnm-log-core log,dhcp: avoid deprecated GTimeVal API and use g_get_real_time() 2023-03-21 10:21:28 +01:00
libnm-log-null all: add some README.md files describing the purpose of our sources 2021-08-19 17:51:11 +02:00
libnm-platform linux-platform: add helper function to query FDB table 2024-12-23 13:02:56 +01:00
libnm-std-aux Updated code format 2024-04-08 06:35:20 +00:00
libnm-systemd-core merge: branch 'systemd' into ff/sync_systemd 2024-04-19 18:16:22 +02:00
libnm-systemd-shared merge: branch 'systemd' into ff/sync_systemd 2024-04-19 18:16:22 +02:00
libnm-udev-aux format: reformat source tree with clang-format 13.0 2021-11-29 09:31:09 +00:00
libnmc-base src: drop most slave references from the code 2024-08-09 16:53:17 +02:00
libnmc-setting hsr: add hsr setting to docs generate script 2024-10-04 12:36:08 +02:00
libnmt-newt nmtui: handle write() errors correctly in nmt_newt_edit_string 2024-07-05 16:51:09 +02:00
linux-headers platform: remove CSME related code 2023-09-25 11:46:24 +00:00
n-acd n-acd: use separate seed state for each probe of the same acd 2023-10-05 09:02:57 +02:00
n-dhcp4 src: drop most master references from the code 2024-08-09 16:53:17 +02:00
nm-cloud-setup cloud-setup: fix placement of directives in the systemd unit 2024-10-04 12:27:12 +02:00
nm-compat-headers all: add src/nm-compat-headers for patching included system headers 2022-09-23 11:43:33 +02:00
nm-daemon-helper nm-daemon-helper: add "service" argument 2024-07-05 14:07:55 +02:00
nm-dispatcher nm-dispatcher: fix crash when parsing output dictionary 2024-03-20 09:31:44 +01:00
nm-initrd-generator src: drop most slave references from the code 2024-08-09 16:53:17 +02:00
nm-online all: use NM_MAX() instead of MAX() 2023-11-15 09:32:21 +01:00
nm-priv-helper all: drop redundant includes 2022-05-09 19:20:18 +02:00
nmcli nmcli/edit: fix memory leak in extract_setting_and_property 2024-08-26 10:59:57 +02:00
nmtui nmtui: correctly check that connection list is non-empty 2024-10-04 12:27:21 +02:00
tests ip6: revert to using sysctl ipv6.conf.default for ip6-privacy 2024-05-13 15:45:54 +02:00
meson.build Revert "build: workaround -Wno-calloc-transposed-args warning in systemd code" 2024-03-12 09:47:06 +01:00
README.md nm-sudo: rename to nm-priv-helper 2022-01-11 21:46:55 +01:00

README.md

src/

Most of the subdirectories are static helper libraries, which get linked into one of the final build artifacts (like libnm, nmcli or NetworkManager). Static libraries are internal API.

The only public API is libnm, which is a shared library provided client implementations.

Our own clients (like nmcli and nmtui) also use libnm, the shared library. But they also use additional static helper libraries.

The daemon statically links against a part of libnm, the part that provides connection profiles. That is libnm-core. libnm-core is thus statically linked with libnm and the daemon. It does not get linked by clients that already link with libnm (like nmtui).

Read the individual README.md files in the subdirectories for details:

Directory Description
core/ the NetworkManager daemon
nmcli/ nmcli application, a command line client for NetworkManager
nmtui/ nmtui application, a text UI client for NetworkManager
nm-cloud-setup/ service to automatically configure NetworkManager in cloud environment
nm-initrd-generator/ generates NetworkManager configuration by parsing kernel command line options for dracut/initrd
nm-dispatcher/ NetworkManager-dispatcher service to run user scripts
nm-online/ application which checks whether NetworkManager is done, for implementing NetworkManager-wait-online.service
nm-priv-helper/ internal service for privileged operations
nm-daemon-helper/ internal helper binary spawned by NetworkManager
libnm-std-aux/ internal helper library for standard C
libnm-glib-aux/ internal helper library for glib
libnm-log-null/ internal helper library with dummy (null) logging backend
libnm-log-core/ internal helper library with logging backend (syslog) used by daemon
libnm-base/ internal helper library with base definitions
libnm-platform/ internal helper library for netlink and other platform/kernel API
libnm-udev-aux/ internal helper library for libudev
libnm-core-public/ public API of libnm (libnm-core part)
libnm-core-intern/ internal API of libnm-core, used by libnm and daemon
libnm-core-impl/ implementation of libnm-core
libnm-core-aux-intern/ internal helper library on top of libnm-core (used by libnm-core itself)
libnm-core-aux-extern/ internal helper library on top of libnm-core (not used by libnm-core)
libnm-client-public/ public API of libnm (NMClient part)
libnm-client-impl/ implementation of libnm (NMClient)
libnm-client-aux-extern/ internal helper library on top of libnm (not used by libnm itself)
libnmc-base/ internal helper library for libnm clients
libnmc-setting/ internal helper library for setting connection profiles (used by nmcli)
libnmt-newt/ internal helper library for libnewt for nmtui
linux-headers/ extra Linux kernel UAPI headers
contrib/ sources that are not used by NetworkManager itself
tests/ unit tests that are not specific to one of the other directories
libnm-client-test/ internal helper library with test utils for libnm
c-list/ fork of c-util helper library for intrusive, doubly linked list
c-rbtree/ fork of c-util helper library for intrusive Red-Black Tree
c-siphash/ fork of c-util helper library for SIPHash24
c-stdaux/ fork of c-util general purpose helpers for standard C
n-acd/ fork of nettools IPv4 ACD library
n-dhcp4/ fork of nettools DHCPv4 library
libnm-systemd-core/ fork of systemd code as network library
libnm-systemd-shared/ fork of systemd code as general purpose library