From 984bc16cc92ea3c247bf34ad667cfb95331b9d3c Mon Sep 17 00:00:00 2001 From: James Morris Date: Fri, 9 Jun 2006 00:29:17 -0700 Subject: [PATCH] [SECMARK]: Add secmark support to core networking. Add a secmark field to the skbuff structure, to allow security subsystems to place security markings on network packets. This is similar to the nfmark field, except is intended for implementing security policy, rather than than networking policy. This patch was already acked in principle by Dave Miller. Signed-off-by: James Morris Signed-off-by: Andrew Morton Signed-off-by: David S. Miller --- include/linux/skbuff.h | 22 ++++++++++++++++++++++ net/Kconfig | 7 +++++++ net/core/skbuff.c | 3 ++- net/ipv4/ip_output.c | 1 + net/ipv4/netfilter/ipt_REJECT.c | 1 + net/ipv6/ip6_output.c | 1 + 6 files changed, 34 insertions(+), 1 deletion(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 23bad3bf3c..fe2c58e530 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -210,6 +210,7 @@ enum { * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c * @tc_index: Traffic control index * @tc_verd: traffic control verdict + * @secmark: security marking */ struct sk_buff { @@ -289,6 +290,9 @@ struct sk_buff { #ifdef CONFIG_NET_DMA dma_cookie_t dma_cookie; #endif +#ifdef CONFIG_NETWORK_SECMARK + __u32 secmark; +#endif /* These elements must be at the end, see alloc_skb() for details. */ @@ -1400,5 +1404,23 @@ static inline void nf_reset(struct sk_buff *skb) static inline void nf_reset(struct sk_buff *skb) {} #endif /* CONFIG_NETFILTER */ +#ifdef CONFIG_NETWORK_SECMARK +static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) +{ + to->secmark = from->secmark; +} + +static inline void skb_init_secmark(struct sk_buff *skb) +{ + skb->secmark = 0; +} +#else +static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) +{ } + +static inline void skb_init_secmark(struct sk_buff *skb) +{ } +#endif + #endif /* __KERNEL__ */ #endif /* _LINUX_SKBUFF_H */ diff --git a/net/Kconfig b/net/Kconfig index ccadc8e481..c6cec5aa54 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -66,6 +66,13 @@ source "net/ipv6/Kconfig" endif # if INET +config NETWORK_SECMARK + bool "Security Marking" + help + This enables security marking of network packets, similar + to nfmark, but designated for security purposes. + If you are unsure how to answer this question, answer N. + menuconfig NETFILTER bool "Network packet filtering (replaces ipchains)" ---help--- diff --git a/net/core/skbuff.c b/net/core/skbuff.c index fb3770f9c0..96cdcbe24b 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -464,7 +464,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask) n->tc_verd = CLR_TC_MUNGED(n->tc_verd); C(input_dev); #endif - + skb_copy_secmark(n, skb); #endif C(truesize); atomic_set(&n->users, 1); @@ -526,6 +526,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old) #endif new->tc_index = old->tc_index; #endif + skb_copy_secmark(new, old); atomic_set(&new->users, 1); skb_shinfo(new)->tso_size = skb_shinfo(old)->tso_size; skb_shinfo(new)->tso_segs = skb_shinfo(old)->tso_segs; diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index cff9c3a72d..d4bb3fae4e 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -410,6 +410,7 @@ static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from) nf_bridge_get(to->nf_bridge); #endif #endif + skb_copy_secmark(to, from); } /* diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c index 0bba3c2bb7..431a3ce6f7 100644 --- a/net/ipv4/netfilter/ipt_REJECT.c +++ b/net/ipv4/netfilter/ipt_REJECT.c @@ -147,6 +147,7 @@ static void send_reset(struct sk_buff *oldskb, int hook) /* This packet will not be the same as the other: clear nf fields */ nf_reset(nskb); nskb->nfmark = 0; + skb_init_secmark(nskb); tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl); diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 416f6e428a..d29620f491 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -459,6 +459,7 @@ static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) nf_bridge_get(to->nf_bridge); #endif #endif + skb_copy_secmark(to, from); } int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) -- 2.39.5