From 6fd2bc3164673b9e6b8975316f2c08c9a01472d5 Mon Sep 17 00:00:00 2001 From: Ben Cartwright-Cox Date: Sat, 24 Oct 2015 22:16:09 +0100 Subject: [PATCH] [IPv4] RFC3514 - Set the evil bit on IPv4 packets as defined by RFC3514 --- net/ipv4/ip_output.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 6c8875c..d7a2aae 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -144,6 +144,9 @@ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, iph->frag_off = htons(IP_DF); else iph->frag_off = 0; + + iph->frag_off |= htons(IP_DF)<< 1; // Set the "evil" bit + iph->ttl = ip_select_ttl(inet, &rt->dst); iph->daddr = (opt && opt->opt.srr ? opt->opt.faddr : daddr); iph->saddr = saddr; @@ -375,6 +378,9 @@ packet_routed: iph->frag_off = htons(IP_DF); else iph->frag_off = 0; + + iph->frag_off |= htons(IP_DF)<< 1; // Set the "evil" bit + iph->ttl = ip_select_ttl(inet, &rt->dst); iph->protocol = sk->sk_protocol; ip_copy_addrs(iph, fl4); -- 1.9.1