From 70f8785b9ee364828e9a0f38275283024df621c2 Mon Sep 17 00:00:00 2001 From: Hans Dedecker Date: Thu, 6 Dec 2018 15:44:57 +0100 Subject: zones: add zone identifying local traffic in raw OUTPUT chain Add zone chains identifying local generated traffic; either by configuring a loopback device or as subnet a loopback address; in the raw OUTPUT chain as local generated traffic is passing this chain. This allows helpers to be used for local generated traffic. Signed-off-by: Alin Nastac Signed-off-by: Hans Dedecker Acked-by: Jo-Philipp Wich --- utils.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'utils.c') diff --git a/utils.c b/utils.c index 684b2c3..7f09787 100644 --- a/utils.c +++ b/utils.c @@ -17,6 +17,10 @@ */ #define _GNU_SOURCE + +#include +#include + #include "utils.h" #include "options.h" @@ -935,3 +939,37 @@ fw3_protoname(void *proto) return pe->p_name; } + +bool +fw3_check_loopback_dev(const char *name) +{ + struct ifreq ifr; + int s = socket(AF_LOCAL, SOCK_DGRAM, 0); + bool rv = false; + + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name) - 1); + + if (s < 0 || ioctl(s, SIOCGIFFLAGS, &ifr) < 0) + goto out; + + if (ifr.ifr_flags & IFF_LOOPBACK) + rv = true; +out: + return rv; +} + +bool +fw3_check_loopback_addr(struct fw3_address *addr) +{ + if (addr->family == FW3_FAMILY_V4 && + (ntohl(addr->address.v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) + return true; + + if (addr->family == FW3_FAMILY_V6 && !addr->range && + fw3_netmask2bitlen(FW3_FAMILY_V6, &addr->mask.v6) == 128 && + IN6_IS_ADDR_LOOPBACK(&addr->address.v6)) + return true; + + return false; +} -- cgit v1.2.1