linux-kernel - Re: linux-next: Tree for March 10 (crypto & NLATTR)

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Date:	Wed, 11 Mar 2009 09:07:05 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	randy.dunlap@...cle.com, geert@...ux-m68k.org,
	sfr@...b.auug.org.au, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: linux-next: Tree for March 10 (crypto & NLATTR)

On Tue, Mar 10, 2009 at 01:17:00PM -0700, David Miller wrote:
> From: Randy Dunlap <randy.dunlap@...cle.com>
> Date: Tue, 10 Mar 2009 13:08:31 -0700
> 
> > I'll have to let David or Herbert answer that.  From my quick look
> > at the code, I don't see much use for nlattr.c when CONFIG_NET
> > is not enabled.
> 
> We want to use the netlink attribute parsers even in non-networking
> code, that's what he's trying to do here.

OK the nlattr construction code really wants to depend on NET
because they're skb-oriented.  We could either move them back
or just wrap them in ifdef CONFIG_NET.

I think the latter is probably the simplest.

How does this patch look? And Randy, does it fix the problem for
you?

nlattr: Fix build error with NET off

We moved the netlink attribute support from net to lib in order
for it to be available for general consumption.  However, parts
of the code (the bits that we don't need :) really depends on
NET because the target object is sk_buff.

This patch fixes this by wrapping them in CONFIG_NET.

Some EXPORTs have been moved to make this work.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/lib/nlattr.c b/lib/nlattr.c
index 56c3ce7..80009a2 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -281,6 +281,7 @@ int nla_strcmp(const struct nlattr *nla, const char *str)
 	return d;
 }
 
+#ifdef CONFIG_NET
 /**
  * __nla_reserve - reserve room for attribute on the skb
  * @skb: socket buffer to reserve room on
@@ -305,6 +306,7 @@ struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
 
 	return nla;
 }
+EXPORT_SYMBOL(__nla_reserve);
 
 /**
  * __nla_reserve_nohdr - reserve room for attribute without header
@@ -325,6 +327,7 @@ void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen)
 
 	return start;
 }
+EXPORT_SYMBOL(__nla_reserve_nohdr);
 
 /**
  * nla_reserve - reserve room for attribute on the skb
@@ -345,6 +348,7 @@ struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
 
 	return __nla_reserve(skb, attrtype, attrlen);
 }
+EXPORT_SYMBOL(nla_reserve);
 
 /**
  * nla_reserve_nohdr - reserve room for attribute without header
@@ -363,6 +367,7 @@ void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen)
 
 	return __nla_reserve_nohdr(skb, attrlen);
 }
+EXPORT_SYMBOL(nla_reserve_nohdr);
 
 /**
  * __nla_put - Add a netlink attribute to a socket buffer
@@ -382,6 +387,7 @@ void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
 	nla = __nla_reserve(skb, attrtype, attrlen);
 	memcpy(nla_data(nla), data, attrlen);
 }
+EXPORT_SYMBOL(__nla_put);
 
 /**
  * __nla_put_nohdr - Add a netlink attribute without header
@@ -399,6 +405,7 @@ void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
 	start = __nla_reserve_nohdr(skb, attrlen);
 	memcpy(start, data, attrlen);
 }
+EXPORT_SYMBOL(__nla_put_nohdr);
 
 /**
  * nla_put - Add a netlink attribute to a socket buffer
@@ -418,6 +425,7 @@ int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 	__nla_put(skb, attrtype, attrlen, data);
 	return 0;
 }
+EXPORT_SYMBOL(nla_put);
 
 /**
  * nla_put_nohdr - Add a netlink attribute without header
@@ -436,6 +444,7 @@ int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
 	__nla_put_nohdr(skb, attrlen, data);
 	return 0;
 }
+EXPORT_SYMBOL(nla_put_nohdr);
 
 /**
  * nla_append - Add a netlink attribute without header or padding
@@ -454,20 +463,13 @@ int nla_append(struct sk_buff *skb, int attrlen, const void *data)
 	memcpy(skb_put(skb, attrlen), data, attrlen);
 	return 0;
 }
+EXPORT_SYMBOL(nla_append);
+#endif
 
 EXPORT_SYMBOL(nla_validate);
 EXPORT_SYMBOL(nla_parse);
 EXPORT_SYMBOL(nla_find);
 EXPORT_SYMBOL(nla_strlcpy);
-EXPORT_SYMBOL(__nla_reserve);
-EXPORT_SYMBOL(__nla_reserve_nohdr);
-EXPORT_SYMBOL(nla_reserve);
-EXPORT_SYMBOL(nla_reserve_nohdr);
-EXPORT_SYMBOL(__nla_put);
-EXPORT_SYMBOL(__nla_put_nohdr);
-EXPORT_SYMBOL(nla_put);
-EXPORT_SYMBOL(nla_put_nohdr);
 EXPORT_SYMBOL(nla_memcpy);
 EXPORT_SYMBOL(nla_memcmp);
 EXPORT_SYMBOL(nla_strcmp);
-EXPORT_SYMBOL(nla_append);

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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