2004-01-08 Greg Troxel <gdt@fnord.ir.bbn.com>
* kernel_socket.c (kernel_read): Use sockaddr_storage in buffer
for reading kernel messages to ensure enough space (necessary on
Solaris due to sockaddr_dl being large). Thanks to Sowmini
Varadhan for help with this change.
diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index b8dfcc7..9dd2615 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -849,10 +849,12 @@
/*
* This must be big enough for any message the kernel might send.
- * The code previously used RTAX_MAX struct sockaddrs in all cases,
- * but now that sockaddrs are variable size, this doesn't work
- * (Solaris has 244 bytes of sdl_data!). For now, add a struct
- * sockaddr_dl to the case where it is used.
+ * Rather than determining how many sockaddrs of what size might be
+ * in each particular message, just use RTAX_MAX of sockaddr_storage
+ * for each. Note that the sockaddrs must be after each message
+ * definition, or rather after whichever happens to be the largest,
+ * since the buffer needs to be big enough for a message and the
+ * sockaddrs together.
*/
union
{
@@ -860,22 +862,21 @@
struct
{
struct rt_msghdr rtm;
- struct sockaddr addr[RTAX_MAX];
+ struct sockaddr_storage addr[RTAX_MAX];
} r;
/* Interface information. */
struct
{
struct if_msghdr ifm;
- struct sockaddr_dl;
- struct sockaddr addr[RTAX_MAX-1];
+ struct sockaddr_storage addr[RTAX_MAX];
} im;
/* Interface address information. */
struct
{
struct ifa_msghdr ifa;
- struct sockaddr addr[RTAX_MAX];
+ struct sockaddr_storage addr[RTAX_MAX];
} ia;
#ifdef RTM_IFANNOUNCE
@@ -883,7 +884,7 @@
struct
{
struct if_announcemsghdr ifan;
- struct sockaddr addr[RTAX_MAX];
+ struct sockaddr_storage addr[RTAX_MAX];
} ian;
#endif /* RTM_IFANNOUNCE */
@@ -908,6 +909,10 @@
rtm = &buf.r.rtm;
+ /*
+ * Ensure that we didn't drop any data, so that processing routines
+ * can assume they have the whole message.
+ */
if (rtm->rtm_msglen != nbytes)
{
zlog_warn ("kernel_read: rtm->rtm_msglen %d, nbytes %d, type %d\n",