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authorPim van Pelt <pim@ipng.nl>2023-10-06 11:26:33 +0200
committerMatthew Smith <mgsmith@netgate.com>2024-01-10 14:49:25 +0000
commit2c9b128e1b3732f9dd62699922480f9206a02b2d (patch)
treec298875846843f34828269346adaa02f160e3e15 /src/plugins/linux-cp
parent2fa69effc844d7a27d46c0f163c0840df961eb2d (diff)
linux-cp: Fix looping netlink messages
Signal when consuming a batch of netlink messages, in order to inhibit lcp_sync from generating new netlink messages. This avoids link up/down state changess from triggering an infinite loop. Do this in the regular case of nl_route_process_msgs() and in the special case of re-synchronizing in lcp_nl_recv_dump_replies(). Type: fix Change-Id: I419d3f9aa350c119b3778b644c65165cb4cc1bef Signed-off-by: Pim van Pelt <pim@ipng.nl>
Diffstat (limited to 'src/plugins/linux-cp')
-rw-r--r--src/plugins/linux-cp/lcp.c16
-rw-r--r--src/plugins/linux-cp/lcp.h9
-rw-r--r--src/plugins/linux-cp/lcp_interface_sync.c11
-rw-r--r--src/plugins/linux-cp/lcp_mpls_sync.c2
-rw-r--r--src/plugins/linux-cp/lcp_nl.c13
5 files changed, 45 insertions, 6 deletions
diff --git a/src/plugins/linux-cp/lcp.c b/src/plugins/linux-cp/lcp.c
index 33c71e44143..561ebb152ae 100644
--- a/src/plugins/linux-cp/lcp.c
+++ b/src/plugins/linux-cp/lcp.c
@@ -145,6 +145,22 @@ lcp_get_del_dynamic_on_link_down (void)
return lcpm->del_dynamic_on_link_down;
}
+void
+lcp_set_netlink_processing_active (u8 is_processing)
+{
+ lcp_main_t *lcpm = &lcp_main;
+
+ lcpm->netlink_processing_active = (is_processing != 0);
+}
+
+u8
+lcp_get_netlink_processing_active (void)
+{
+ lcp_main_t *lcpm = &lcp_main;
+
+ return lcpm->netlink_processing_active;
+}
+
/*
* fd.io coding-style-patch-verification: ON
*
diff --git a/src/plugins/linux-cp/lcp.h b/src/plugins/linux-cp/lcp.h
index 4ddaa3898d6..3b6b4ec00d4 100644
--- a/src/plugins/linux-cp/lcp.h
+++ b/src/plugins/linux-cp/lcp.h
@@ -29,6 +29,8 @@ typedef struct lcp_main_s
u8 del_static_on_link_down; /* Delete static routes when link goes down */
u8 del_dynamic_on_link_down; /* Delete dynamic routes when link goes down */
u8 test_mode; /* Set when Unit testing */
+ u8 netlink_processing_active; /* Set while a batch of Netlink messages are
+ being processed */
} lcp_main_t;
extern lcp_main_t lcp_main;
@@ -52,6 +54,13 @@ u8 lcp_get_del_static_on_link_down (void);
void lcp_set_del_dynamic_on_link_down (u8 is_del);
u8 lcp_get_del_dynamic_on_link_down (void);
+/**
+ * Get/Set when we're processing a batch of netlink messages.
+ * This is used to avoid looping messages between lcp-sync and netlink.
+ */
+void lcp_set_netlink_processing_active (u8 is_processing);
+u8 lcp_get_netlink_processing_active (void);
+
#endif
/*
diff --git a/src/plugins/linux-cp/lcp_interface_sync.c b/src/plugins/linux-cp/lcp_interface_sync.c
index bd26ebbc354..ca7638e1799 100644
--- a/src/plugins/linux-cp/lcp_interface_sync.c
+++ b/src/plugins/linux-cp/lcp_interface_sync.c
@@ -37,7 +37,7 @@ lcp_itf_pair_sync_state (lcp_itf_pair_t *lip)
u32 mtu;
u32 netlink_mtu;
- if (!lcp_sync ())
+ if (!lcp_sync () || lcp_get_netlink_processing_active ())
return;
sw =
@@ -176,7 +176,7 @@ lcp_itf_admin_state_change (vnet_main_t *vnm, u32 sw_if_index, u32 flags)
vnet_hw_interface_t *hi;
vnet_sw_interface_t *si;
- if (!lcp_sync ())
+ if (!lcp_sync () || lcp_get_netlink_processing_active ())
return 0;
LCP_ITF_PAIR_DBG ("admin_state_change: sw %U %u",
@@ -223,7 +223,8 @@ lcp_itf_mtu_change (vnet_main_t *vnm, u32 sw_if_index, u32 flags)
{
vnet_sw_interface_t *si;
vnet_hw_interface_t *hi;
- if (!lcp_sync ())
+
+ if (!lcp_sync () || lcp_get_netlink_processing_active ())
return NULL;
LCP_ITF_PAIR_DBG ("mtu_change: sw %U %u", format_vnet_sw_if_index_name, vnm,
@@ -271,7 +272,7 @@ lcp_itf_ip4_add_del_interface_addr (ip4_main_t *im, uword opaque,
int curr_ns_fd = -1;
int vif_ns_fd = -1;
- if (!lcp_sync ())
+ if (!lcp_sync () || lcp_get_netlink_processing_active ())
return;
LCP_ITF_PAIR_DBG ("ip4_addr_%s: si:%U %U/%u", is_del ? "del" : "add",
@@ -320,7 +321,7 @@ lcp_itf_ip6_add_del_interface_addr (ip6_main_t *im, uword opaque,
int curr_ns_fd = -1;
int vif_ns_fd = -1;
- if (!lcp_sync ())
+ if (!lcp_sync () || lcp_get_netlink_processing_active ())
return;
LCP_ITF_PAIR_DBG ("ip6_addr_%s: si:%U %U/%u", is_del ? "del" : "add",
diff --git a/src/plugins/linux-cp/lcp_mpls_sync.c b/src/plugins/linux-cp/lcp_mpls_sync.c
index d4b0d13b907..c08fcb4d1d9 100644
--- a/src/plugins/linux-cp/lcp_mpls_sync.c
+++ b/src/plugins/linux-cp/lcp_mpls_sync.c
@@ -77,6 +77,8 @@ lcp_mpls_sync_state_cb (struct mpls_main_t *mm, uword opaque, u32 sw_if_index,
format_lcp_itf_pair, lip);
// If syncing is enabled, sync Linux state as well.
+ // This can happen regardless of lcp_get_netlink_processing_active(),
+ // provided it does not generate Netlink messages.
if (!lcp_sync ())
return;
diff --git a/src/plugins/linux-cp/lcp_nl.c b/src/plugins/linux-cp/lcp_nl.c
index b548d7afa39..85b6447007a 100644
--- a/src/plugins/linux-cp/lcp_nl.c
+++ b/src/plugins/linux-cp/lcp_nl.c
@@ -348,6 +348,8 @@ nl_route_process_msgs (void)
nl_msg_info_t *msg_info;
int err, n_msgs = 0;
+ lcp_set_netlink_processing_active (1);
+
/* process a batch of messages. break if we hit our limit */
vec_foreach (msg_info, nm->nl_msg_queue)
{
@@ -365,6 +367,8 @@ nl_route_process_msgs (void)
NL_DBG ("Processed %u messages", n_msgs);
+ lcp_set_netlink_processing_active (0);
+
return n_msgs;
}
@@ -441,10 +445,15 @@ lcp_nl_recv_dump_replies (nl_sock_type_t sock_type, int msg_limit,
int done = 0;
int n_msgs = 0;
+ lcp_set_netlink_processing_active (1);
+
continue_reading:
n_bytes = nl_recv (sk_route, &nla, &buf, /* creds */ NULL);
if (n_bytes <= 0)
- return n_bytes;
+ {
+ lcp_set_netlink_processing_active (0);
+ return n_bytes;
+ }
hdr = (struct nlmsghdr *) buf;
while (nlmsg_ok (hdr, n_bytes))
@@ -521,6 +530,8 @@ continue_reading:
goto continue_reading;
out:
+ lcp_set_netlink_processing_active (0);
+
nlmsg_free (msg);
free (buf);