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authorAl Viro <viro@zeniv.linux.org.uk>2006-09-27 18:43:07 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-28 18:02:25 -0700
commit4f765d842fa6e6fe15d555b247b640118d65b4dd (patch)
tree7a7d3ef7f8013c76811558c045d7aacfc7feeaff /include/net/inet_hashtables.h
parent45d60b9e29556a7831812ec338d82f4d3a4145f8 (diff)
[IPV4]: INET_MATCH() annotations
INET_MATCH() and friends depend on an interesting set of kludges: * there's a pair of adjacent fields in struct inet_sock - __be16 dport followed by __u16 num. We want to search by pair, so we combine the keys into a single 32bit value and compare with 32bit value read from &...->dport. * on 64bit targets we combine comparisons with pair of adjacent __be32 fields in the same way. Make sure that we don't mix those values with anything else and that pairs we form them from have correct types. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_hashtables.h')
-rw-r--r--include/net/inet_hashtables.h36
1 files changed, 25 insertions, 11 deletions
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index b4491c9e2a5a..fb0c09c7090c 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -283,31 +283,45 @@ static inline struct sock *inet_lookup_listener(struct inet_hashinfo *hashinfo,
}
/* Socket demux engine toys. */
+/* What happens here is ugly; there's a pair of adjacent fields in
+ struct inet_sock; __be16 dport followed by __u16 num. We want to
+ search by pair, so we combine the keys into a single 32bit value
+ and compare with 32bit value read from &...->dport. Let's at least
+ make sure that it's not mixed with anything else...
+ On 64bit targets we combine comparisons with pair of adjacent __be32
+ fields in the same way.
+*/
+typedef __u32 __bitwise __portpair;
#ifdef __BIG_ENDIAN
#define INET_COMBINED_PORTS(__sport, __dport) \
- (((__u32)(__sport) << 16) | (__u32)(__dport))
+ ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
#else /* __LITTLE_ENDIAN */
#define INET_COMBINED_PORTS(__sport, __dport) \
- (((__u32)(__dport) << 16) | (__u32)(__sport))
+ ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
#endif
#if (BITS_PER_LONG == 64)
+typedef __u64 __bitwise __addrpair;
#ifdef __BIG_ENDIAN
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
- const __u64 __name = (((__u64)(__saddr)) << 32) | ((__u64)(__daddr));
+ const __addrpair __name = (__force __addrpair) ( \
+ (((__force __u64)(__be32)(__saddr)) << 32) | \
+ ((__force __u64)(__be32)(__daddr)));
#else /* __LITTLE_ENDIAN */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
- const __u64 __name = (((__u64)(__daddr)) << 32) | ((__u64)(__saddr));
+ const __addrpair __name = (__force __addrpair) ( \
+ (((__force __u64)(__be32)(__daddr)) << 32) | \
+ ((__force __u64)(__be32)(__saddr)));
#endif /* __BIG_ENDIAN */
#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && \
- ((*((__u64 *)&(inet_sk(__sk)->daddr))) == (__cookie)) && \
- ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \
+ ((*((__addrpair *)&(inet_sk(__sk)->daddr))) == (__cookie)) && \
+ ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#define INET_TW_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && \
- ((*((__u64 *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
- ((*((__u32 *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
+ ((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
+ ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#else /* 32-bit arch */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr)
@@ -315,13 +329,13 @@ static inline struct sock *inet_lookup_listener(struct inet_hashinfo *hashinfo,
(((__sk)->sk_hash == (__hash)) && \
(inet_sk(__sk)->daddr == (__saddr)) && \
(inet_sk(__sk)->rcv_saddr == (__daddr)) && \
- ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \
+ ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#define INET_TW_MATCH(__sk, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
(((__sk)->sk_hash == (__hash)) && \
(inet_twsk(__sk)->tw_daddr == (__saddr)) && \
(inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \
- ((*((__u32 *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
+ ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#endif /* 64-bit arch */
@@ -338,7 +352,7 @@ static inline struct sock *
const int dif)
{
INET_ADDR_COOKIE(acookie, saddr, daddr)
- const __u32 ports = INET_COMBINED_PORTS(sport, hnum);
+ const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
struct sock *sk;
const struct hlist_node *node;
/* Optimize here for direct hit, only listening connections can