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authorJulian Wiedmann <jwi@linux.ibm.com>2018-11-02 21:04:09 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-27 18:10:48 +0300
commit8cab58117e72caa2234323ce399f77037fe4dea2 (patch)
tree98cf67d12296b0b1280d73f6f2786122b14d7860 /drivers/s390/net
parentfdf4e678ea193ec9c2e099509994a118260f0d8c (diff)
downloadlinux-8cab58117e72caa2234323ce399f77037fe4dea2.tar.xz
s390/qeth: fix HiperSockets sniffer
[ Upstream commit bd74a7f9cc033cf4d405788f80292268987dc0c5 ] Sniffing mode for L3 HiperSockets requires that no IP addresses are registered with the HW. The preferred way to achieve this is for userspace to delete all the IPs on the interface. But qeth is expected to also tolerate a configuration where that is not the case, by skipping the IP registration when in sniffer mode. Since commit 5f78e29ceebf ("qeth: optimize IP handling in rx_mode callback") reworked the IP registration logic in the L3 subdriver, this no longer works. When the qeth device is set online, qeth_l3_recover_ip() now unconditionally registers all unicast addresses from our internal IP table. While we could fix this particular problem by skipping qeth_l3_recover_ip() on a sniffer device, the more future-proof change is to skip the IP address registration at the lowest level. This way we a) catch any future code path that attempts to register an IP address without considering the sniffer scenario, and b) continue to build up our internal IP table, so that if sniffer mode is switched off later we can operate just like normal. Fixes: 5f78e29ceebf ("qeth: optimize IP handling in rx_mode callback") Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/s390/net')
-rw-r--r--drivers/s390/net/qeth_l3_main.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index cd73172bff47..a19f2dc69e8a 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -358,9 +358,6 @@ static void qeth_l3_clear_ip_htable(struct qeth_card *card, int recover)
QETH_CARD_TEXT(card, 4, "clearip");
- if (recover && card->options.sniffer)
- return;
-
spin_lock_bh(&card->ip_lock);
hash_for_each_safe(card->ip_htable, i, tmp, addr, hnode) {
@@ -818,6 +815,8 @@ static int qeth_l3_register_addr_entry(struct qeth_card *card,
int rc = 0;
int cnt = 3;
+ if (card->options.sniffer)
+ return 0;
if (addr->proto == QETH_PROT_IPV4) {
QETH_CARD_TEXT(card, 2, "setaddr4");
@@ -853,6 +852,9 @@ static int qeth_l3_deregister_addr_entry(struct qeth_card *card,
{
int rc = 0;
+ if (card->options.sniffer)
+ return 0;
+
if (addr->proto == QETH_PROT_IPV4) {
QETH_CARD_TEXT(card, 2, "deladdr4");
QETH_CARD_HEX(card, 3, &addr->u.a4.addr, sizeof(int));