From 6aebb9b280e5662ece41cf570e25e61795443985 Mon Sep 17 00:00:00 2001 From: Roel Kluin <12o3l@tiscali.nl> Date: Thu, 20 Mar 2008 15:06:23 -0700 Subject: [NETFILTER]: nf_conntrack_h323: logical-bitwise & confusion in process_setup() logical-bitwise & confusion Signed-off-by: Roel Kluin <12o3l@tiscali.nl> Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/nf_conntrack_h323_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net') diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c index 62137879e6aa..898f1922b5b8 100644 --- a/net/netfilter/nf_conntrack_h323_main.c +++ b/net/netfilter/nf_conntrack_h323_main.c @@ -842,7 +842,7 @@ static int process_setup(struct sk_buff *skb, struct nf_conn *ct, set_h225_addr = rcu_dereference(set_h225_addr_hook); if ((setup->options & eSetup_UUIE_destCallSignalAddress) && - (set_h225_addr) && ct->status && IPS_NAT_MASK && + (set_h225_addr) && ct->status & IPS_NAT_MASK && get_h225_addr(ct, *data, &setup->destCallSignalAddress, &addr, &port) && memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { -- cgit v1.2.3-59-g8ed1b From d0ebf133590abdc035af6e19a6568667af0ab3b0 Mon Sep 17 00:00:00 2001 From: Daniel Hokka Zakrisson Date: Thu, 20 Mar 2008 15:07:10 -0700 Subject: [NETFILTER]: ipt_recent: sanity check hit count If a rule using ipt_recent is created with a hit count greater than ip_pkt_list_tot, the rule will never match as it cannot keep track of enough timestamps. This patch makes ipt_recent refuse to create such rules. With ip_pkt_list_tot's default value of 20, the following can be used to reproduce the problem. nc -u -l 0.0.0.0 1234 & for i in `seq 1 100`; do echo $i | nc -w 1 -u 127.0.0.1 1234; done This limits it to 20 packets: iptables -A OUTPUT -p udp --dport 1234 -m recent --set --name test \ --rsource iptables -A OUTPUT -p udp --dport 1234 -m recent --update --seconds \ 60 --hitcount 20 --name test --rsource -j DROP While this is unlimited: iptables -A OUTPUT -p udp --dport 1234 -m recent --set --name test \ --rsource iptables -A OUTPUT -p udp --dport 1234 -m recent --update --seconds \ 60 --hitcount 21 --name test --rsource -j DROP With the patch the second rule-set will throw an EINVAL. Reported-by: Sean Kennedy Signed-off-by: Daniel Hokka Zakrisson Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/ipv4/netfilter/ipt_recent.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net') diff --git a/net/ipv4/netfilter/ipt_recent.c b/net/ipv4/netfilter/ipt_recent.c index 68cbe3ca01ce..8e8f0425a8ed 100644 --- a/net/ipv4/netfilter/ipt_recent.c +++ b/net/ipv4/netfilter/ipt_recent.c @@ -252,6 +252,8 @@ recent_mt_check(const char *tablename, const void *ip, if ((info->check_set & (IPT_RECENT_SET | IPT_RECENT_REMOVE)) && (info->seconds || info->hit_count)) return false; + if (info->hit_count > ip_pkt_list_tot) + return false; if (info->name[0] == '\0' || strnlen(info->name, IPT_RECENT_NAME_LEN) == IPT_RECENT_NAME_LEN) return false; -- cgit v1.2.3-59-g8ed1b From 270637abff0cdf848b910b9f96ad342e1da61c66 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Thu, 20 Mar 2008 15:17:14 -0700 Subject: [SCTP]: Fix a race between module load and protosw access There is a race is SCTP between the loading of the module and the access by the socket layer to the protocol functions. In particular, a list of addresss that SCTP maintains is not initialized prior to the registration with the protosw. Thus it is possible for a user application to gain access to SCTP functions before everything has been initialized. The problem shows up as odd crashes during connection initializtion when we try to access the SCTP address list. The solution is to refactor how we do registration and initialize the lists prior to registering with the protosw. Care must be taken since the address list initialization depends on some other pieces of SCTP initialization. Also the clean-up in case of failure now also needs to be refactored. Signed-off-by: Vlad Yasevich Acked-by: Sridhar Samudrala Signed-off-by: David S. Miller --- include/net/sctp/sctp.h | 12 +++-- net/sctp/ipv6.c | 32 +++++++----- net/sctp/protocol.c | 129 +++++++++++++++++++++++++++++++----------------- 3 files changed, 112 insertions(+), 61 deletions(-) (limited to 'net') diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 57df27f19588..57ed3e323d97 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -380,15 +380,19 @@ static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) -int sctp_v6_init(void); -void sctp_v6_exit(void); +void sctp_v6_pf_init(void); +void sctp_v6_pf_exit(void); +int sctp_v6_protosw_init(void); +void sctp_v6_protosw_exit(void); int sctp_v6_add_protocol(void); void sctp_v6_del_protocol(void); #else /* #ifdef defined(CONFIG_IPV6) */ -static inline int sctp_v6_init(void) { return 0; } -static inline void sctp_v6_exit(void) { return; } +static inline void sctp_v6_pf_init(void) { return 0; } +static inline void sctp_v6_pf_exit(void) { return; } +static inline int sctp_v6_protosw_init(void) { return 0; } +static inline void sctp_v6_protosw_exit(void) { return; } static inline int sctp_v6_add_protocol(void) { return 0; } static inline void sctp_v6_del_protocol(void) { return; } diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 9aa0733aee87..b1e05d719f9b 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -1014,15 +1014,24 @@ static struct sctp_pf sctp_pf_inet6 = { }; /* Initialize IPv6 support and register with socket layer. */ -int sctp_v6_init(void) +void sctp_v6_pf_init(void) { - int rc; - /* Register the SCTP specific PF_INET6 functions. */ sctp_register_pf(&sctp_pf_inet6, PF_INET6); /* Register the SCTP specific AF_INET6 functions. */ sctp_register_af(&sctp_af_inet6); +} + +void sctp_v6_pf_exit(void) +{ + list_del(&sctp_af_inet6.list); +} + +/* Initialize IPv6 support and register with socket layer. */ +int sctp_v6_protosw_init(void) +{ + int rc; rc = proto_register(&sctpv6_prot, 1); if (rc) @@ -1035,6 +1044,14 @@ int sctp_v6_init(void) return 0; } +void sctp_v6_protosw_exit(void) +{ + inet6_unregister_protosw(&sctpv6_seqpacket_protosw); + inet6_unregister_protosw(&sctpv6_stream_protosw); + proto_unregister(&sctpv6_prot); +} + + /* Register with inet6 layer. */ int sctp_v6_add_protocol(void) { @@ -1047,15 +1064,6 @@ int sctp_v6_add_protocol(void) return 0; } -/* IPv6 specific exit support. */ -void sctp_v6_exit(void) -{ - inet6_unregister_protosw(&sctpv6_seqpacket_protosw); - inet6_unregister_protosw(&sctpv6_stream_protosw); - proto_unregister(&sctpv6_prot); - list_del(&sctp_af_inet6.list); -} - /* Unregister with inet6 layer. */ void sctp_v6_del_protocol(void) { diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index 7a7646a9565c..f90091a1b9ce 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -992,6 +992,58 @@ static void cleanup_sctp_mibs(void) free_percpu(sctp_statistics[1]); } +static void sctp_v4_pf_init(void) +{ + /* Initialize the SCTP specific PF functions. */ + sctp_register_pf(&sctp_pf_inet, PF_INET); + sctp_register_af(&sctp_af_inet); +} + +static void sctp_v4_pf_exit(void) +{ + list_del(&sctp_af_inet.list); +} + +static int sctp_v4_protosw_init(void) +{ + int rc; + + rc = proto_register(&sctp_prot, 1); + if (rc) + return rc; + + /* Register SCTP(UDP and TCP style) with socket layer. */ + inet_register_protosw(&sctp_seqpacket_protosw); + inet_register_protosw(&sctp_stream_protosw); + + return 0; +} + +static void sctp_v4_protosw_exit(void) +{ + inet_unregister_protosw(&sctp_stream_protosw); + inet_unregister_protosw(&sctp_seqpacket_protosw); + proto_unregister(&sctp_prot); +} + +static int sctp_v4_add_protocol(void) +{ + /* Register notifier for inet address additions/deletions. */ + register_inetaddr_notifier(&sctp_inetaddr_notifier); + + /* Register SCTP with inet layer. */ + if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) + return -EAGAIN; + + return 0; +} + +static void sctp_v4_del_protocol(void) +{ + inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); + unregister_inetaddr_notifier(&sctp_inetaddr_notifier); +} + /* Initialize the universe into something sensible. */ SCTP_STATIC __init int sctp_init(void) { @@ -1035,8 +1087,6 @@ SCTP_STATIC __init int sctp_init(void) /* Initialize object count debugging. */ sctp_dbg_objcnt_init(); - /* Initialize the SCTP specific PF functions. */ - sctp_register_pf(&sctp_pf_inet, PF_INET); /* * 14. Suggested SCTP Protocol Parameter Values */ @@ -1194,19 +1244,22 @@ SCTP_STATIC __init int sctp_init(void) sctp_sysctl_register(); INIT_LIST_HEAD(&sctp_address_families); - sctp_register_af(&sctp_af_inet); + sctp_v4_pf_init(); + sctp_v6_pf_init(); - status = proto_register(&sctp_prot, 1); - if (status) - goto err_proto_register; + /* Initialize the local address list. */ + INIT_LIST_HEAD(&sctp_local_addr_list); + spin_lock_init(&sctp_local_addr_lock); + sctp_get_local_addr_list(); - /* Register SCTP(UDP and TCP style) with socket layer. */ - inet_register_protosw(&sctp_seqpacket_protosw); - inet_register_protosw(&sctp_stream_protosw); + status = sctp_v4_protosw_init(); - status = sctp_v6_init(); if (status) - goto err_v6_init; + goto err_protosw_init; + + status = sctp_v6_protosw_init(); + if (status) + goto err_v6_protosw_init; /* Initialize the control inode/socket for handling OOTB packets. */ if ((status = sctp_ctl_sock_init())) { @@ -1215,19 +1268,9 @@ SCTP_STATIC __init int sctp_init(void) goto err_ctl_sock_init; } - /* Initialize the local address list. */ - INIT_LIST_HEAD(&sctp_local_addr_list); - spin_lock_init(&sctp_local_addr_lock); - sctp_get_local_addr_list(); - - /* Register notifier for inet address additions/deletions. */ - register_inetaddr_notifier(&sctp_inetaddr_notifier); - - /* Register SCTP with inet layer. */ - if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) { - status = -EAGAIN; + status = sctp_v4_add_protocol(); + if (status) goto err_add_protocol; - } /* Register SCTP with inet6 layer. */ status = sctp_v6_add_protocol(); @@ -1238,18 +1281,18 @@ SCTP_STATIC __init int sctp_init(void) out: return status; err_v6_add_protocol: - inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); - unregister_inetaddr_notifier(&sctp_inetaddr_notifier); + sctp_v6_del_protocol(); err_add_protocol: - sctp_free_local_addr_list(); + sctp_v4_del_protocol(); sock_release(sctp_ctl_socket); err_ctl_sock_init: - sctp_v6_exit(); -err_v6_init: - inet_unregister_protosw(&sctp_stream_protosw); - inet_unregister_protosw(&sctp_seqpacket_protosw); - proto_unregister(&sctp_prot); -err_proto_register: + sctp_v6_protosw_exit(); +err_v6_protosw_init: + sctp_v4_protosw_exit(); +err_protosw_init: + sctp_free_local_addr_list(); + sctp_v4_pf_exit(); + sctp_v6_pf_exit(); sctp_sysctl_unregister(); list_del(&sctp_af_inet.list); free_pages((unsigned long)sctp_port_hashtable, @@ -1282,23 +1325,21 @@ SCTP_STATIC __exit void sctp_exit(void) /* Unregister with inet6/inet layers. */ sctp_v6_del_protocol(); - inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); - - /* Unregister notifier for inet address additions/deletions. */ - unregister_inetaddr_notifier(&sctp_inetaddr_notifier); - - /* Free the local address list. */ - sctp_free_local_addr_list(); + sctp_v4_del_protocol(); /* Free the control endpoint. */ sock_release(sctp_ctl_socket); - /* Cleanup v6 initializations. */ - sctp_v6_exit(); + /* Free protosw registrations */ + sctp_v6_protosw_exit(); + sctp_v4_protosw_exit(); + + /* Free the local address list. */ + sctp_free_local_addr_list(); /* Unregister with socket layer. */ - inet_unregister_protosw(&sctp_stream_protosw); - inet_unregister_protosw(&sctp_seqpacket_protosw); + sctp_v6_pf_exit(); + sctp_v4_pf_exit(); sctp_sysctl_unregister(); list_del(&sctp_af_inet.list); @@ -1317,8 +1358,6 @@ SCTP_STATIC __exit void sctp_exit(void) kmem_cache_destroy(sctp_chunk_cachep); kmem_cache_destroy(sctp_bucket_cachep); - - proto_unregister(&sctp_prot); } module_init(sctp_init); -- cgit v1.2.3-59-g8ed1b From 2bec008ca9fd009aa503b75344d1c22da9256141 Mon Sep 17 00:00:00 2001 From: Fabio Checconi Date: Thu, 20 Mar 2008 15:54:58 -0700 Subject: bridge: use time_before() in br_fdb_cleanup() In br_fdb_cleanup() next_timer and this_timer are in jiffies, so they should be compared using the time_after() macro. Signed-off-by: Fabio Checconi Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br_fdb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net') diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index bc40377136a2..9326c377822e 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -136,7 +136,7 @@ void br_fdb_cleanup(unsigned long _data) this_timer = f->ageing_timer + delay; if (time_before_eq(this_timer, jiffies)) fdb_delete(f); - else if (this_timer < next_timer) + else if (time_before(this_timer, next_timer)) next_timer = this_timer; } } -- cgit v1.2.3-59-g8ed1b From 8a455b087c9629b3ae3b521b4f1ed16672f978cc Mon Sep 17 00:00:00 2001 From: Jarek Poplawski Date: Thu, 20 Mar 2008 16:07:27 -0700 Subject: netpoll: zap_completion_queue: adjust skb->users counter zap_completion_queue() retrieves skbs from completion_queue where they have zero skb->users counter. Before dev_kfree_skb_any() it should be non-zero yet, so it's increased now. Reported-and-tested-by: Andrew Morton Signed-off-by: Jarek Poplawski Signed-off-by: Andrew Morton Signed-off-by: David S. Miller --- net/core/netpoll.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 4b7e756181c9..c635de52526c 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -215,10 +215,12 @@ static void zap_completion_queue(void) while (clist != NULL) { struct sk_buff *skb = clist; clist = clist->next; - if (skb->destructor) + if (skb->destructor) { + atomic_inc(&skb->users); dev_kfree_skb_any(skb); /* put this one back */ - else + } else { __kfree_skb(skb); + } } } -- cgit v1.2.3-59-g8ed1b From 607bfbf2d55dd1cfe5368b41c2a81a8c9ccf4723 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Thu, 20 Mar 2008 16:11:27 -0700 Subject: [TCP]: Fix shrinking windows with window scaling When selecting a new window, tcp_select_window() tries not to shrink the offered window by using the maximum of the remaining offered window size and the newly calculated window size. The newly calculated window size is always a multiple of the window scaling factor, the remaining window size however might not be since it depends on rcv_wup/rcv_nxt. This means we're effectively shrinking the window when scaling it down. The dump below shows the problem (scaling factor 2^7): - Window size of 557 (71296) is advertised, up to 3111907257: IP 172.2.2.3.33000 > 172.2.2.2.33000: . ack 3111835961 win 557 <...> - New window size of 514 (65792) is advertised, up to 3111907217, 40 bytes below the last end: IP 172.2.2.3.33000 > 172.2.2.2.33000: . 3113575668:3113577116(1448) ack 3111841425 win 514 <...> The number 40 results from downscaling the remaining window: 3111907257 - 3111841425 = 65832 65832 / 2^7 = 514 65832 % 2^7 = 40 If the sender uses up the entire window before it is shrunk, this can have chaotic effects on the connection. When sending ACKs, tcp_acceptable_seq() will notice that the window has been shrunk since tcp_wnd_end() is before tp->snd_nxt, which makes it choose tcp_wnd_end() as sequence number. This will fail the receivers checks in tcp_sequence() however since it is before it's tp->rcv_wup, making it respond with a dupack. If both sides are in this condition, this leads to a constant flood of ACKs until the connection times out. Make sure the window is never shrunk by aligning the remaining window to the window scaling factor. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/ipv4/tcp_output.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net') diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 01578f544ad6..72b9350006fe 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -255,7 +255,7 @@ static u16 tcp_select_window(struct sock *sk) * * Relax Will Robinson. */ - new_win = cur_win; + new_win = ALIGN(cur_win, 1 << tp->rx_opt.rcv_wscale); } tp->rcv_wnd = new_win; tp->rcv_wup = tp->rcv_nxt; -- cgit v1.2.3-59-g8ed1b From 38fe999e2286139cccdaa500a81bd49a16a81158 Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Thu, 20 Mar 2008 16:13:58 -0700 Subject: [IPV6] KCONFIG: Fix description about IPV6_TUNNEL. Based on notice from "Colin" . Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- net/ipv6/Kconfig | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig index 58219dfffef8..47263e45bacb 100644 --- a/net/ipv6/Kconfig +++ b/net/ipv6/Kconfig @@ -179,11 +179,12 @@ config IPV6_SIT Saying M here will produce a module called sit.ko. If unsure, say Y. config IPV6_TUNNEL - tristate "IPv6: IPv6-in-IPv6 tunnel" + tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)" select INET6_TUNNEL depends on IPV6 ---help--- - Support for IPv6-in-IPv6 tunnels described in RFC 2473. + Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in + RFC 2473. If unsure, say N. -- cgit v1.2.3-59-g8ed1b