diff options
author | Arnaldo Carvalho de Melo <acme@mandriva.com> | 2005-08-12 09:26:18 -0300 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2005-08-29 15:57:29 -0700 |
commit | 5324a040ccc708998e61ea93e669b81312f0ae11 (patch) | |
tree | 08e40652e7c9394277a0b5e08148c43a97d46670 /net | |
parent | 505cbfc577f3fa778005e2800b869eca25727d5f (diff) | |
download | op-kernel-dev-5324a040ccc708998e61ea93e669b81312f0ae11.zip op-kernel-dev-5324a040ccc708998e61ea93e669b81312f0ae11.tar.gz |
[INET6_HASHTABLES]: Move inet6_lookup functions to net/ipv6/inet6_hashtables.c
Doing this we allow tcp_diag to support IPV6 even if tcp_diag is compiled
statically and IPV6 is compiled as a module, removing the previous restriction
while not building any IPV6 code if it is not selected.
Now to work on the tcpdiag_register infrastructure and then to rename the whole
thing to inetdiag, reflecting its by then completely generic nature.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r-- | net/ipv4/Kconfig | 4 | ||||
-rw-r--r-- | net/ipv6/Makefile | 2 | ||||
-rw-r--r-- | net/ipv6/inet6_hashtables.c | 81 | ||||
-rw-r--r-- | net/ipv6/tcp_ipv6.c | 154 |
4 files changed, 85 insertions, 156 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index a79b4f9..960c02f 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -419,9 +419,7 @@ config IP_TCPDIAG ---help--- Support for TCP socket monitoring interface used by native Linux tools such as ss. ss is included in iproute2, currently downloadable - at <http://developer.osdl.org/dev/iproute2>. If you want IPv6 or DCCP - support and have selected IPv6 or DCCP as a module, you need to build - this as a module too. + at <http://developer.osdl.org/dev/iproute2>. If unsure, say Y. diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile index 5bccea2..6460eec 100644 --- a/net/ipv6/Makefile +++ b/net/ipv6/Makefile @@ -23,3 +23,5 @@ obj-$(CONFIG_NETFILTER) += netfilter/ obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o obj-y += exthdrs_core.o + +obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c new file mode 100644 index 0000000..01d5f46 --- /dev/null +++ b/net/ipv6/inet6_hashtables.c @@ -0,0 +1,81 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Generic INET6 transport hashtables + * + * Authors: Lotsa people, from code originally in tcp + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/config.h> + +#include <linux/module.h> + +#include <net/inet_connection_sock.h> +#include <net/inet_hashtables.h> +#include <net/inet6_hashtables.h> + +struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, + const struct in6_addr *daddr, + const unsigned short hnum, const int dif) +{ + struct sock *sk; + const struct hlist_node *node; + struct sock *result = NULL; + int score, hiscore = 0; + + read_lock(&hashinfo->lhash_lock); + sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) { + if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) { + const struct ipv6_pinfo *np = inet6_sk(sk); + + score = 1; + if (!ipv6_addr_any(&np->rcv_saddr)) { + if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) + continue; + score++; + } + if (sk->sk_bound_dev_if) { + if (sk->sk_bound_dev_if != dif) + continue; + score++; + } + if (score == 3) { + result = sk; + break; + } + if (score > hiscore) { + hiscore = score; + result = sk; + } + } + } + if (result) + sock_hold(result); + read_unlock(&hashinfo->lhash_lock); + return result; +} + +EXPORT_SYMBOL_GPL(inet6_lookup_listener); + +struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, + const struct in6_addr *saddr, const u16 sport, + const struct in6_addr *daddr, const u16 dport, + const int dif) +{ + struct sock *sk; + + local_bh_disable(); + sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif); + local_bh_enable(); + + return sk; +} + +EXPORT_SYMBOL_GPL(inet6_lookup); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 2bc7faf..fb291b8 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -47,6 +47,7 @@ #include <net/tcp.h> #include <net/ndisc.h> +#include <net/inet6_hashtables.h> #include <net/ipv6.h> #include <net/transp_v6.h> #include <net/addrconf.h> @@ -75,30 +76,6 @@ static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok); static struct tcp_func ipv6_mapped; static struct tcp_func ipv6_specific; -/* I have no idea if this is a good hash for v6 or not. -DaveM */ -static inline int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport, - const struct in6_addr *faddr, const u16 fport, - const int ehash_size) -{ - int hashent = (lport ^ fport); - - hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]); - hashent ^= hashent>>16; - hashent ^= hashent>>8; - return (hashent & (ehash_size - 1)); -} - -static inline int inet6_sk_ehashfn(const struct sock *sk, const int ehash_size) -{ - const struct inet_sock *inet = inet_sk(sk); - const struct ipv6_pinfo *np = inet6_sk(sk); - const struct in6_addr *laddr = &np->rcv_saddr; - const struct in6_addr *faddr = &np->daddr; - const __u16 lport = inet->num; - const __u16 fport = inet->dport; - return inet6_ehashfn(laddr, lport, faddr, fport, ehash_size); -} - static inline int tcp_v6_bind_conflict(const struct sock *sk, const struct inet_bind_bucket *tb) { @@ -259,135 +236,6 @@ static void tcp_v6_hash(struct sock *sk) } } -static struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, - const struct in6_addr *daddr, - const unsigned short hnum, - const int dif) -{ - struct sock *sk; - struct hlist_node *node; - struct sock *result = NULL; - int score, hiscore; - - hiscore=0; - read_lock(&hashinfo->lhash_lock); - sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) { - if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) { - struct ipv6_pinfo *np = inet6_sk(sk); - - score = 1; - if (!ipv6_addr_any(&np->rcv_saddr)) { - if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) - continue; - score++; - } - if (sk->sk_bound_dev_if) { - if (sk->sk_bound_dev_if != dif) - continue; - score++; - } - if (score == 3) { - result = sk; - break; - } - if (score > hiscore) { - hiscore = score; - result = sk; - } - } - } - if (result) - sock_hold(result); - read_unlock(&hashinfo->lhash_lock); - return result; -} - -/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so - * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM - * - * The sockhash lock must be held as a reader here. - */ - -static inline struct sock * - __inet6_lookup_established(struct inet_hashinfo *hashinfo, - const struct in6_addr *saddr, - const u16 sport, - const struct in6_addr *daddr, - const u16 hnum, - const int dif) -{ - struct sock *sk; - const struct hlist_node *node; - const __u32 ports = INET_COMBINED_PORTS(sport, hnum); - /* Optimize here for direct hit, only listening connections can - * have wildcards anyways. - */ - const int hash = inet6_ehashfn(daddr, hnum, saddr, sport, - hashinfo->ehash_size); - struct inet_ehash_bucket *head = &hashinfo->ehash[hash]; - - read_lock(&head->lock); - sk_for_each(sk, node, &head->chain) { - /* For IPV6 do the cheaper port and family tests first. */ - if (INET6_MATCH(sk, saddr, daddr, ports, dif)) - goto hit; /* You sunk my battleship! */ - } - /* Must check for a TIME_WAIT'er before going to listener hash. */ - sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) { - const struct inet_timewait_sock *tw = inet_twsk(sk); - - if(*((__u32 *)&(tw->tw_dport)) == ports && - sk->sk_family == PF_INET6) { - const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); - - if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && - ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && - (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif)) - goto hit; - } - } - read_unlock(&head->lock); - return NULL; - -hit: - sock_hold(sk); - read_unlock(&head->lock); - return sk; -} - - -static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo, - const struct in6_addr *saddr, - const u16 sport, - const struct in6_addr *daddr, - const u16 hnum, - const int dif) -{ - struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport, - daddr, hnum, dif); - if (sk) - return sk; - - return inet6_lookup_listener(hashinfo, daddr, hnum, dif); -} - -inline struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, - const struct in6_addr *saddr, const u16 sport, - const struct in6_addr *daddr, const u16 dport, - const int dif) -{ - struct sock *sk; - - local_bh_disable(); - sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif); - local_bh_enable(); - - return sk; -} - -EXPORT_SYMBOL_GPL(inet6_lookup); - - /* * Open request hash tables. */ |