This reverts commit c3be7bd61d19 ("net: sysrq via icmp").
Carsten suggested to remove it from the queue since probably won't reach
mainline.
Cc: Carsten Emde <C.Emde@xxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
Documentation/admin-guide/sysrq.rst | 12 ------------
include/net/netns/ipv4.h | 1 -
net/ipv4/icmp.c | 30 ------------------------------
net/ipv4/sysctl_net_ipv4.c | 7 -------
4 files changed, 50 deletions(-)
diff --git a/Documentation/admin-guide/sysrq.rst b/Documentation/admin-guide/sysrq.rst
index 934563e4dbb8..7b9035c01a2e 100644
--- a/Documentation/admin-guide/sysrq.rst
+++ b/Documentation/admin-guide/sysrq.rst
@@ -77,18 +77,6 @@ On all
echo t > /proc/sysrq-trigger
-On all
- Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g.::
-
- echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq
-
- Send an ICMP echo request with this pattern plus the particular
- SysRq command key. Example::
-
- ping -c1 -s57 -p0102030468
-
- will trigger the SysRq-H (help) command.
-
What are the 'command' keys?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 93164a31ec51..8fcff2837484 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -79,7 +79,6 @@ struct netns_ipv4 {
int sysctl_icmp_echo_ignore_all;
int sysctl_icmp_echo_ignore_broadcasts;
- int sysctl_icmp_echo_sysrq;
int sysctl_icmp_ignore_bogus_error_responses;
int sysctl_icmp_ratelimit;
int sysctl_icmp_ratemask;
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 574d2a3c86a0..0310ea93f877 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -69,7 +69,6 @@
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
-#include <linux/sysrq.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
@@ -924,30 +923,6 @@ static bool icmp_redirect(struct sk_buff *skb)
return true;
}
-/*
- * 32bit and 64bit have different timestamp length, so we check for
- * the cookie at offset 20 and verify it is repeated at offset 50
- */
-#define CO_POS0 20
-#define CO_POS1 50
-#define CO_SIZE sizeof(int)
-#define ICMP_SYSRQ_SIZE 57
-
-/*
- * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie
- * pattern and if it matches send the next byte as a trigger to sysrq.
- */
-static void icmp_check_sysrq(struct net *net, struct sk_buff *skb)
-{
- int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq);
- char *p = skb->data;
-
- if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) &&
- !memcmp(&cookie, p + CO_POS1, CO_SIZE) &&
- p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE])
- handle_sysrq(p[CO_POS0 + CO_SIZE]);
-}
-
/*
* Handle ICMP_ECHO ("ping") requests.
*
@@ -975,11 +950,6 @@ static bool icmp_echo(struct sk_buff *skb)
icmp_param.data_len = skb->len;
icmp_param.head_len = sizeof(struct icmphdr);
icmp_reply(&icmp_param, skb);
-
- if (skb->len == ICMP_SYSRQ_SIZE &&
- net->ipv4.sysctl_icmp_echo_sysrq) {
- icmp_check_sysrq(net, skb);
- }
}
/* should there be an ICMP stat for ignored echos? */
return true;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 747ba53a8100..0989e739d098 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -771,13 +771,6 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
- {
- .procname = "icmp_echo_sysrq",
- .data = &init_net.ipv4.sysctl_icmp_echo_sysrq,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
{
.procname = "icmp_ignore_bogus_error_responses",
.data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
--
2.15.1
--
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