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2011-05-10xfrm: Don't allow esn with disabled anti replay detectionSteffen Klassert
Unlike the standard case, disabled anti replay detection needs some nontrivial extra treatment on ESN. RFC 4303 states: Note: If a receiver chooses to not enable anti-replay for an SA, then the receiver SHOULD NOT negotiate ESN in an SA management protocol. Use of ESN creates a need for the receiver to manage the anti-replay window (in order to determine the correct value for the high-order bits of the ESN, which are employed in the ICV computation), which is generally contrary to the notion of disabling anti-replay for an SA. So return an error if an ESN state with disabled anti replay detection is inserted for now and add the extra treatment later if we need it. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-10xfrm: Assign the inner mode output function to the dst entrySteffen Klassert
As it is, we assign the outer modes output function to the dst entry when we create the xfrm bundle. This leads to two problems on interfamily scenarios. We might insert ipv4 packets into ip6_fragment when called from xfrm6_output. The system crashes if we try to fragment an ipv4 packet with ip6_fragment. This issue was introduced with git commit ad0081e4 (ipv6: Fragment locally generated tunnel-mode IPSec6 packets as needed). The second issue is, that we might insert ipv4 packets in netfilter6 and vice versa on interfamily scenarios. With this patch we assign the inner mode output function to the dst entry when we create the xfrm bundle. So xfrm4_output/xfrm6_output from the inner mode is used and the right fragmentation and netfilter functions are called. We switch then to outer mode with the output_finish functions. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-04-26xfrm: Check for the new replay implementation if an esn state is insertedSteffen Klassert
IPsec extended sequence numbers can be used only with the new anti-replay window implementation. So check if the new implementation is used if an esn state is inserted and return an error if it is not. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-04-26xfrm: Fix replay window size calculation on initializationSteffen Klassert
On replay initialization, we compute the size of the replay buffer to see if the replay window fits into the buffer. This computation lacks a mutliplication by 8 because we need the size in bit, not in byte. So we might return an error even though the replay window would fit into the buffer. This patch fixes this issue. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-31Fix common misspellingsLucas De Marchi
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-28xfrm: Restrict extended sequence numbers to espSteffen Klassert
The IPsec extended sequence numbers are fully implemented just for esp. So restrict the usage to esp until other protocols have support too. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-28xfrm: Check for esn buffer len in xfrm_new_aeSteffen Klassert
In xfrm_new_ae() we may overwrite the allocated esn replay state buffer with a wrong size. So check that the new size matches the original allocated size and return an error if this is not the case. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-28xfrm: Assign esn pointers when cloning a stateSteffen Klassert
When we clone a xfrm state we have to assign the replay_esn and the preplay_esn pointers to the state if we use the new replay detection method. To this end, we add a xfrm_replay_clone() function that allocates memory for the replay detection and takes over the necessary values from the original state. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-28xfrm: Move the test on replay window size into the replay check functionsSteffen Klassert
As it is, the replay check is just performed if the replay window of the legacy implementation is nonzero. So we move the test on a nonzero replay window inside the replay check functions to be sure we are testing for the right implementation. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-27dst: Clone child entry in skb_dst_popSteffen Klassert
We clone the child entry in skb_dst_pop before we call skb_dst_drop(). Otherwise we might kill the child right before we return it to the caller. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-27xfrm: Force a dst refcount before entering the xfrm type handlersSteffen Klassert
Crypto requests might return asynchronous. In this case we leave the rcu protected region, so force a refcount on the skb's destination entry before we enter the xfrm type input/output handlers. This fixes a crash when a route is deleted whilst sending IPsec data that is transformed by an asynchronous algorithm. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-21xfrm: Fix initialize repl field of struct xfrm_stateWei Yongjun
Commit 'xfrm: Move IPsec replay detection functions to a separate file' (9fdc4883d92d20842c5acea77a4a21bb1574b495) introduce repl field to struct xfrm_state, and only initialize it under SA's netlink create path, the other path, such as pf_key, ipcomp/ipcomp6 etc, the repl field remaining uninitialize. So if the SA is created by pf_key, any input packet with SA's encryption algorithm will cause panic. int xfrm_input() { ... x->repl->advance(x, seq); ... } This patch fixed it by introduce new function __xfrm_init_state(). Pid: 0, comm: swapper Not tainted 2.6.38-next+ #14 Bochs Bochs EIP: 0060:[<c078e5d5>] EFLAGS: 00010206 CPU: 0 EIP is at xfrm_input+0x31c/0x4cc EAX: dd839c00 EBX: 00000084 ECX: 00000000 EDX: 01000000 ESI: dd839c00 EDI: de3a0780 EBP: dec1de88 ESP: dec1de64 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Process swapper (pid: 0, ti=dec1c000 task=c09c0f20 task.ti=c0992000) Stack: 00000000 00000000 00000002 c0ba27c0 00100000 01000000 de3a0798 c0ba27c0 00000033 dec1de98 c0786848 00000000 de3a0780 dec1dea4 c0786868 00000000 dec1debc c074ee56 e1da6b8c de3a0780 c074ed44 de3a07a8 dec1decc c074ef32 Call Trace: [<c0786848>] xfrm4_rcv_encap+0x22/0x27 [<c0786868>] xfrm4_rcv+0x1b/0x1d [<c074ee56>] ip_local_deliver_finish+0x112/0x1b1 [<c074ed44>] ? ip_local_deliver_finish+0x0/0x1b1 [<c074ef32>] NF_HOOK.clone.1+0x3d/0x44 [<c074ef77>] ip_local_deliver+0x3e/0x44 [<c074ed44>] ? ip_local_deliver_finish+0x0/0x1b1 [<c074ec03>] ip_rcv_finish+0x30a/0x332 [<c074e8f9>] ? ip_rcv_finish+0x0/0x332 [<c074ef32>] NF_HOOK.clone.1+0x3d/0x44 [<c074f188>] ip_rcv+0x20b/0x247 [<c074e8f9>] ? ip_rcv_finish+0x0/0x332 [<c072797d>] __netif_receive_skb+0x373/0x399 [<c0727bc1>] netif_receive_skb+0x4b/0x51 [<e0817e2a>] cp_rx_poll+0x210/0x2c4 [8139cp] [<c072818f>] net_rx_action+0x9a/0x17d [<c0445b5c>] __do_softirq+0xa1/0x149 [<c0445abb>] ? __do_softirq+0x0/0x149 Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-16xfrm: Refcount destination entry on xfrm_lookupSteffen Klassert
We return a destination entry without refcount if a socket policy is found in xfrm_lookup. This triggers a warning on a negative refcount when freeeing this dst entry. So take a refcount in this case to fix it. This refcount was forgotten when xfrm changed to cache bundles instead of policies for outgoing flows. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Timo Teräs <timo.teras@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-15xfrm: fix __xfrm_route_forward()Eric Dumazet
This function should return 0 in case of error, 1 if OK commit 452edd598f60522 (xfrm: Return dst directly from xfrm_lookup()) got it wrong. Reported-and-bisected-by: Michael Smith <msmith@cbnco.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-13xfrm: Add user interface for esn and big anti-replay windowsSteffen Klassert
This patch adds a netlink based user interface to configure esn and big anti-replay windows. The new netlink attribute XFRMA_REPLAY_ESN_VAL is used to configure the new implementation. If the XFRM_STATE_ESN flag is set, we use esn and support for big anti-replay windows for the configured state. If this flag is not set we use the new implementation with 32 bit sequence numbers. A big anti-replay window can be configured in this case anyway. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-13xfrm: Add support for IPsec extended sequence numbersSteffen Klassert
This patch adds support for IPsec extended sequence numbers (esn) as defined in RFC 4303. The bits to manage the anti-replay window are based on a patch from Alex Badea. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-13xfrm: Support anti-replay window size bigger than 32 packetsSteffen Klassert
As it is, the anti-replay bitmap in struct xfrm_replay_state can only accomodate 32 packets. Even though it is possible to configure anti-replay window sizes up to 255 packets from userspace. So we reject any packet with a sequence number within the configured window but outside the bitmap. With this patch, we represent the anti-replay window as a bitmap of variable length that can be accessed via the new struct xfrm_replay_state_esn. Thus, we have no limit on the window size anymore. To use the new anti-replay window implementantion, new userspace tools are required. We leave the old implementation untouched to stay in sync with old userspace tools. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-13xfrm: Move IPsec replay detection functions to a separate fileSteffen Klassert
To support multiple versions of replay detection, we move the replay detection functions to a separate file and make them accessible via function pointers contained in the struct xfrm_replay. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-13xfrm: Use separate low and high order bits of the sequence numbers in ↵Steffen Klassert
xfrm_skb_cb To support IPsec extended sequence numbers, we split the output sequence numbers of xfrm_skb_cb in low and high order 32 bits and we add the high order 32 bits to the input sequence numbers. All users are updated accordingly. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-12net: Use flowi4 and flowi6 in xfrm layer.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-12net: Break struct flowi out into AF specific instances.David S. Miller
Now we have struct flowi4, flowi6, and flowidn for each address family. And struct flowi is just a union of them all. It might have been troublesome to convert flow_cache_uli_match() but as it turns out this function is completely unused and therefore can be simply removed. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-12net: Make flowi ports AF dependent.David S. Miller
Create two sets of port member accessors, one set prefixed by fl4_* and the other prefixed by fl6_* This will let us to create AF optimal flow instances. It will work because every context in which we access the ports, we have to be fully aware of which AF the flowi is anyways. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-12net: Put flowi_* prefix on AF independent members of struct flowiDavid S. Miller
I intend to turn struct flowi into a union of AF specific flowi structs. There will be a common structure that each variant includes first, much like struct sock_common. This is the first step to move in that direction. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-12xfrm: Eliminate "fl" and "pol" args to xfrm_bundle_ok().David S. Miller
There is only one caller of xfrm_bundle_ok(), and that always passes these parameters as NULL. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-03netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parmsPatrick McHardy
Netlink message processing in the kernel is synchronous these days, the session information can be collected when needed. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-02xfrm: Return dst directly from xfrm_lookup()David S. Miller
Instead of on the stack. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-01xfrm: Handle blackhole route creation via afinfo.David S. Miller
That way we don't have to potentially do this in every xfrm_lookup() caller. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-01xfrm: Kill XFRM_LOOKUP_WAIT flag.David S. Miller
This can be determined from the flow flags instead. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-27xfrm: Pass const xfrm_address_t objects to xfrm_state_lookup* and xfrm_find_acq.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-27xfrm: Pass name as const to xfrm_*_get_byname().David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify xfrm_address_t args to xfrm_state_find.David S. Miller
This required a const'ification in xfrm_init_tempstate() too. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Remove unused 'saddr' and 'daddr' args to xfrm_state_look_at.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify xfrm_address_t args to __xfrm_state_lookup{,_byaddr}.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify xfrm_tmpl arg to xfrm_init_tempstate.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify xfrm_address_t args to xfrm_*_hash.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify sec_path arg to secpath_has_nontransport.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify ptr args to xfrm_policy_ok.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify ptr args to xfrm_state_ok.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify selector arg to xfrm_dst_update_parent.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify policy arg to clone_policy.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify policy arg and local selector in xfrm_policy_match.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify local xfrm_address_t pointers in xfrm_policy_lookup_bytype.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify selector args in xfrm_migrate paths.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify address args to hash helpers.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify pointer args to km_migrate() and implementations.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify pointer args to migrate_tmpl_match and xfrm_migrate_checkDavid S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify address arguments to __xfrm_dst_lookup()David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Const'ify selector argument to xfrm_selector_match()David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-23xfrm: Pass km_event pointers around as const when possible.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-22net: Make flow cache paths use a const struct flowi.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
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