From: David S. Miller Date: Mon, 3 Oct 2005 23:07:30 +0000 (-0700) Subject: [IPV4]: Update icmp sysctl docs and disable broadcast ECHO/TIMESTAMP by default X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7ce312467edc270fcbd8a699efabb37ce1802b98;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [IPV4]: Update icmp sysctl docs and disable broadcast ECHO/TIMESTAMP by default It's not a good idea to be smurf'able by default. The few people who need this can turn it on. Signed-off-by: David S. Miller --- diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index ab65714d95fc..b433c8a27e2d 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -355,10 +355,14 @@ ip_dynaddr - BOOLEAN Default: 0 icmp_echo_ignore_all - BOOLEAN + If set non-zero, then the kernel will ignore all ICMP ECHO + requests sent to it. + Default: 0 + icmp_echo_ignore_broadcasts - BOOLEAN - If either is set to true, then the kernel will ignore either all - ICMP ECHO requests sent to it or just those to broadcast/multicast - addresses, respectively. + If set non-zero, then the kernel will ignore all ICMP ECHO and + TIMESTAMP requests sent to it via broadcast/multicast. + Default: 1 icmp_ratelimit - INTEGER Limit the maximal rates for sending ICMP packets whose type matches diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 24eb56ae1b5a..90dca711ac9f 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -188,7 +188,7 @@ struct icmp_err icmp_err_convert[] = { /* Control parameters for ECHO replies. */ int sysctl_icmp_echo_ignore_all; -int sysctl_icmp_echo_ignore_broadcasts; +int sysctl_icmp_echo_ignore_broadcasts = 1; /* Control parameter - ignore bogus broadcast responses? */ int sysctl_icmp_ignore_bogus_error_responses;