proxmox-mirrors/mirror_frr
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_frr synced 2025-08-03 20:55:25 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

zebra: don't change connected state from zebra/interface.c

Browse Source 
Try to avoid changing connected state from zebra/interface.c as this
means making assumptions about kernel behaviour which may be or may
become wrong. This state should rather be updated by events from the
kernel.

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
Christian Franke 2013-01-24 14:04:49 +00:00 committed by David Lamparter
parent f7f740fe58
commit 02b4805f39
2 changed files with 69 additions and 106 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
zebra/connected.c
View File

@ -37,7 +37,7 @@
#include "zebra/connected.h"
extern struct zebra_t zebrad;
/* withdraw a connected address */
/* communicate the withdrawal of a connected address */
static void
connected_withdraw (struct connected *ifc)
{
@ -81,24 +81,19 @@ connected_announce (struct interface *ifp, struct connected *ifc)
listnode_add (ifp->connected, ifc);
/* Update interface address information to protocol daemon. */
if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
if (ifc->address->family == AF_INET)
if_subnet_add (ifp, ifc);
zebra_interface_address_add_update (ifp, ifc);
if (if_is_operative(ifp))
{
if (ifc->address->family == AF_INET)
if_subnet_add (ifp, ifc);
SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
zebra_interface_address_add_update (ifp, ifc);
if (if_is_operative(ifp))
{
if (ifc->address->family == AF_INET)
connected_up_ipv4 (ifp, ifc);
connected_up_ipv4 (ifp, ifc);
#ifdef HAVE_IPV6
else
connected_up_ipv6 (ifp, ifc);
else
connected_up_ipv6 (ifp, ifc);
#endif
}
}
}
@ -116,7 +111,7 @@ connected_check (struct interface *ifp, struct prefix *p)
return NULL;
}
/* Check if two ifc's describe the same address */
/* Check if two ifc's describe the same address in the same state */
static int
connected_same (struct connected *ifc1, struct connected *ifc2)
{
@ -136,6 +131,9 @@ connected_same (struct connected *ifc1, struct connected *ifc2)
if (ifc1->flags != ifc2->flags)
return 0;
if (ifc1->conf != ifc2->conf)
return 0;
return 1;
}
@ -156,7 +154,7 @@ connected_update(struct interface *ifp, struct connected *ifc)
/* Avoid spurious withdraws, this might be just the kernel 'reflecting'
* back an address we have already added.
*/
if (connected_same (current, ifc) && CHECK_FLAG(current->conf, ZEBRA_IFC_REAL))
if (connected_same (current, ifc))
{
/* nothing to do */
connected_free (ifc);
@ -169,8 +167,9 @@ connected_update(struct interface *ifp, struct connected *ifc)
connected_withdraw (current); /* implicit withdraw - freebsd does this */
}
/* If the connected is new or has changed, announce it */
connected_announce(ifp, ifc);
/* If the connected is new or has changed, announce it, if it is usable */
if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
connected_announce(ifp, ifc);
}
/* Called from if_up(). */
@ -279,6 +278,10 @@ connected_add_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
if (label)
ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
/* For all that I know an IPv4 address is always ready when we receive
* the notification. So it should be safe to set the REAL flag here. */
SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
connected_update(ifp, ifc);
}
@ -407,6 +410,14 @@ connected_add_ipv6 (struct interface *ifp, int flags, struct in6_addr *addr,
if (label)
ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
/* On Linux, we only get here when DAD is complete, therefore we can set
* ZEBRA_IFC_REAL.
*
* On BSD, there currently doesn't seem to be a way to check for completion of
* DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL, although DAD
* might still be running.
*/
SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
connected_update(ifp, ifc);
}

126
zebra/interface.c
View File

@ -193,6 +193,9 @@ if_subnet_delete (struct interface *ifp, struct connected *ifc)
ifc = listgetdata (listhead (addr_list));
zebra_interface_address_delete_update (ifp, ifc);
UNSET_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY);
/* XXX: Linux kernel removes all the secondary addresses when the primary
* address is removed. We could try to work around that, though this is
* non-trivial. */
zebra_interface_address_add_update (ifp, ifc);
}
@ -296,16 +299,23 @@ if_addr_wakeup (struct interface *ifp)
{
if (! if_is_up (ifp))
{
/* XXX: WTF is it trying to set flags here?
* caller has just gotten a new interface, has been
* handed the flags already. This code has no business
* trying to override administrative status of the interface.
* The only call path to here which doesn't originate from
* kernel event is irdp - what on earth is it trying to do?
*
* further RUNNING is not a settable flag on any system
* I (paulj) am aware of.
*/
/* Assume zebra is configured like following:
*
* interface gre0
* ip addr 192.0.2.1/24
* !
*
* As soon as zebra becomes first aware that gre0 exists in the
* kernel, it will set gre0 up and configure its addresses.
*
* (This may happen at startup when the interface already exists
* or during runtime when the interface is added to the kernel)
*
* XXX: IRDP code is calling here via if_add_update - this seems
* somewhat weird.
* XXX: RUNNING is not a settable flag on any system
* I (paulj) am aware of.
*/
if_set_flags (ifp, IFF_UP | IFF_RUNNING);
if_refresh (ifp);
}
@ -318,23 +328,17 @@ if_addr_wakeup (struct interface *ifp)
continue;
}
/* Add to subnet chain list. */
if_subnet_add (ifp, ifc);
SET_FLAG (ifc->conf, ZEBRA_IFC_QUEUED);
SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
zebra_interface_address_add_update (ifp, ifc);
if (if_is_operative(ifp))
connected_up_ipv4 (ifp, ifc);
/* The address will be advertised to zebra clients when the notification
* from the kernel has been received.
* It will also be added to the interface's subnet list then. */
}
#ifdef HAVE_IPV6
if (p->family == AF_INET6)
{
if (! if_is_up (ifp))
{
/* XXX: See long comment above */
/* See long comment above */
if_set_flags (ifp, IFF_UP | IFF_RUNNING);
if_refresh (ifp);
}
@ -346,13 +350,10 @@ if_addr_wakeup (struct interface *ifp)
safe_strerror(errno));
continue;
}
SET_FLAG (ifc->conf, ZEBRA_IFC_QUEUED);
SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
zebra_interface_address_add_update (ifp, ifc);
if (if_is_operative(ifp))
connected_up_ipv6 (ifp, ifc);
/* The address will be advertised to zebra clients when the notification
* from the kernel has been received. */
}
#endif /* HAVE_IPV6 */
}
@ -450,9 +451,11 @@ if_delete_update (struct interface *ifp)
ifc = listgetdata (anode);
p = ifc->address;
connected_down_ipv4 (ifp, ifc);
/* XXX: We have to send notifications here explicitly, because we destroy
* the ifc before receiving the notification about the address being deleted.
*/
zebra_interface_address_delete_update (ifp, ifc);
UNSET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
@ -1251,19 +1254,10 @@ ip_address_install (struct vty *vty, struct interface *ifp,
return CMD_WARNING;
}
/* Add to subnet chain list (while marking secondary attribute). */
if_subnet_add (ifp, ifc);
/* IP address propery set. */
SET_FLAG (ifc->conf, ZEBRA_IFC_QUEUED);
SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
/* Update interface address information to protocol daemon. */
zebra_interface_address_add_update (ifp, ifc);
/* If interface is up register connected route. */
if (if_is_operative(ifp))
connected_up_ipv4 (ifp, ifc);
/* The address will be advertised to zebra clients when the notification
* from the kernel has been received.
* It will also be added to the subnet chain list, then. */
}
return CMD_SUCCESS;
@ -1317,35 +1311,9 @@ ip_address_uninstall (struct vty *vty, struct interface *ifp,
safe_strerror(errno), VTY_NEWLINE);
return CMD_WARNING;
}
/* success! call returned that the address deletion went through.
* this is a synchronous operation, so we know it succeeded and can
* now update all internal state. */
/* the HAVE_NETLINK check is only here because, on BSD, although the
* call above is still synchronous, we get a second confirmation later
* through the route socket, and we don't want to touch that behaviour
* for now. It should work without the #ifdef, but why take the risk...
* -- equinox 2012-07-13 */
UNSET_FLAG (ifc->conf, ZEBRA_IFC_QUEUED);
#ifdef HAVE_NETLINK
/* Remove connected route. */
connected_down_ipv4 (ifp, ifc);
/* Redistribute this information. */
zebra_interface_address_delete_update (ifp, ifc);
/* IP address propery set. */
UNSET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
/* remove from interface, remark secondaries */
if_subnet_delete (ifp, ifc);
/* Free address information. */
listnode_delete (ifp->connected, ifc);
connected_free (ifc);
#endif
/* we will receive a kernel notification about this route being removed.
* this will trigger its removal from the connected list. */
return CMD_SUCCESS;
}
@ -1462,16 +1430,9 @@ ipv6_address_install (struct vty *vty, struct interface *ifp,
return CMD_WARNING;
}
/* IP address propery set. */
SET_FLAG (ifc->conf, ZEBRA_IFC_QUEUED);
SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
/* Update interface address information to protocol daemon. */
zebra_interface_address_add_update (ifp, ifc);
/* If interface is up register connected route. */
if (if_is_operative(ifp))
connected_up_ipv6 (ifp, ifc);
/* The address will be advertised to zebra clients when the notification
* from the kernel has been received. */
}
return CMD_SUCCESS;
@ -1527,17 +1488,8 @@ ipv6_address_uninstall (struct vty *vty, struct interface *ifp,
}
UNSET_FLAG (ifc->conf, ZEBRA_IFC_QUEUED);
/* Redistribute this information. */
zebra_interface_address_delete_update (ifp, ifc);
/* Remove connected route. */
connected_down_ipv6 (ifp, ifc);
/* Free address information. */
listnode_delete (ifp->connected, ifc);
connected_free (ifc);
/* This information will be propagated to the zclients when the
* kernel notification is received. */
return CMD_SUCCESS;
}