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Revision 22.214.171.124 / (download) - annotate - [select for diffs], Mon Feb 26 13:32:01 2018 UTC (3 weeks, 1 day ago) by martin
Changes since 126.96.36.199: +4 -4 lines
Diff to previous 188.8.131.52 (colored) to branchpoint 1.178 (colored) next main 1.179 (colored)
Pull up following revision(s) (requested by ozaki-r in ticket #588): sys/netinet6/in6.c: revision 1.260 sys/netinet/in.c: revision 1.219 sys/netinet/wqinput.c: revision 1.4 sys/rump/net/lib/libnetinet/netinet_component.c: revision 1.11 sys/netinet/ip_input.c: revision 1.376 sys/netinet6/ip6_input.c: revision 1.193 Avoid a deadlock between softnet_lock and IFNET_LOCK A deadlock occurs because there is a violation of the rule of lock ordering; softnet_lock is held with hodling IFNET_LOCK, which violates the rule. To avoid the deadlock, replace softnet_lock in in_control and in6_control with KERNEL_LOCK. We also need to add some KERNEL_LOCKs to protect the network stack surely. This is required, for example, for PR kern/51356. Fix PR kern/53043
Revision 184.108.40.206 / (download) - annotate - [select for diffs], Mon Feb 26 00:26:46 2018 UTC (3 weeks, 2 days ago) by snj
Changes since 220.127.116.11: +10 -3 lines
Diff to previous 18.104.22.168 (colored) to branchpoint 1.178 (colored)
Pull up following revision(s) (requested by maxv in ticket #568): sys/netinet6/ip6_input.c: 1.188 Kick nested fragments.
Revision 22.214.171.124 / (download) - annotate - [select for diffs], Tue Jan 30 18:21:09 2018 UTC (7 weeks ago) by martin
Changes since 126.96.36.199: +20 -26 lines
Diff to previous 188.8.131.52 (colored) to branchpoint 1.178 (colored)
Pull up following revision(s) (requested by maxv in ticket #527): sys/netinet6/frag6.c: revision 1.65 sys/netinet6/ip6_input.c: revision 1.187 sys/netinet6/ip6_var.h: revision 1.78 sys/netinet6/raw_ip6.c: revision 1.160 Fix a buffer overflow in ip6_get_prevhdr. Doing mtod(m, char *) + len is wrong, an option is allowed to be located in another mbuf of the chain. If the offset of an option within the chain is bigger than the length of the first mbuf in that chain, we are reading/writing one byte of packet- controlled data beyond the end of the first mbuf. The length of this first mbuf depends on the layout the network driver chose. In the most difficult case, it will allocate a 2KB cluster, which is bigger than the Ethernet MTU. But there is at least one way of exploiting this case: by sending a special combination of nested IPv6 fragments, the packet can control a good bunch of 'len'. By luck, the memory pool containing clusters does not embed the pool header in front of the items, so it is not straightforward to predict what is located at 'mtod(m, char *) + len'. However, by sending offending fragments in a loop, it is possible to crash the kernel - at some point we will hit important data structures. As far as I can tell, PF protects against this difficult case, because it kicks nested fragments. NPF does not protect against this. IPF I don't know. Then there are the more easy cases, if the MTU is bigger than a cluster, or if the network driver did not allocate a cluster, or perhaps if the fragments are received via a tunnel; I haven't investigated these cases. Change ip6_get_prevhdr so that it returns an offset in the chain, and always use IP6_EXTHDR_GET to get a writable pointer. IP6_EXTHDR_GET leaves M_PKTHDR untouched. This place is still fragile.
Revision 184.108.40.206 / (download) - annotate - [select for diffs], Tue Jan 2 10:20:34 2018 UTC (2 months, 2 weeks ago) by snj
Changes since 220.127.116.11: +4 -8 lines
Diff to previous 18.104.22.168 (colored) to branchpoint 1.178 (colored)
Pull up following revision(s) (requested by ozaki-r in ticket #456): sys/arch/arm/sunxi/sunxi_emac.c: 1.9 sys/dev/ic/dwc_gmac.c: 1.43-1.44 sys/dev/pci/if_iwm.c: 1.75 sys/dev/pci/if_wm.c: 1.543 sys/dev/pci/ixgbe/ixgbe.c: 1.112 sys/dev/pci/ixgbe/ixv.c: 1.74 sys/kern/sys_socket.c: 1.75 sys/net/agr/if_agr.c: 1.43 sys/net/bpf.c: 1.219 sys/net/if.c: 1.397, 1.399, 1.401-1.403, 1.406-1.410, 1.412-1.416 sys/net/if.h: 1.242-1.247, 1.250, 1.252-1.257 sys/net/if_bridge.c: 1.140 via patch, 1.142-1.146 sys/net/if_etherip.c: 1.40 sys/net/if_ethersubr.c: 1.243, 1.246 sys/net/if_faith.c: 1.57 sys/net/if_gif.c: 1.132 sys/net/if_l2tp.c: 1.15, 1.17 sys/net/if_loop.c: 1.98-1.101 sys/net/if_media.c: 1.35 sys/net/if_pppoe.c: 1.131-1.132 sys/net/if_spppsubr.c: 1.176-1.177 sys/net/if_tun.c: 1.142 sys/net/if_vlan.c: 1.107, 1.109, 1.114-1.121 sys/net/npf/npf_ifaddr.c: 1.3 sys/net/npf/npf_os.c: 1.8-1.9 sys/net/rtsock.c: 1.230 sys/netcan/if_canloop.c: 1.3-1.5 sys/netinet/if_arp.c: 1.255 sys/netinet/igmp.c: 1.65 sys/netinet/in.c: 1.210-1.211 sys/netinet/in_pcb.c: 1.180 sys/netinet/ip_carp.c: 1.92, 1.94 sys/netinet/ip_flow.c: 1.81 sys/netinet/ip_input.c: 1.362 sys/netinet/ip_mroute.c: 1.147 sys/netinet/ip_output.c: 1.283, 1.285, 1.287 sys/netinet6/frag6.c: 1.61 sys/netinet6/in6.c: 1.251, 1.255 sys/netinet6/in6_pcb.c: 1.162 sys/netinet6/ip6_flow.c: 1.35 sys/netinet6/ip6_input.c: 1.183 sys/netinet6/ip6_output.c: 1.196 sys/netinet6/mld6.c: 1.90 sys/netinet6/nd6.c: 1.239-1.240 sys/netinet6/nd6_nbr.c: 1.139 sys/netinet6/nd6_rtr.c: 1.136 sys/netipsec/ipsec_output.c: 1.65 sys/rump/net/lib/libnetinet/netinet_component.c: 1.9-1.10 kmem_intr_free kmem_intr_[z]alloced memory the underlying pools are the same but api-wise those should match Unify IFEF_*_MPSAFE into IFEF_MPSAFE There are already two flags for if_output and if_start, however, it seems such MPSAFE flags are eventually needed for all if_XXX operations. Having discrete flags for each operation is wasteful of if_extflags bits. So let's unify the flags into one: IFEF_MPSAFE. Fortunately IFEF_*_MPSAFE flags have never been included in any releases, so we can change them without breaking backward compatibility of the releases (though the kernel version of -current should be bumped). Note that if an interface have both MP-safe and non-MP-safe operations at a time, we have to set the IFEF_MPSAFE flag and let callees of non-MP-safe opeartions take the kernel lock. Proposed on tech-kern@ and tech-net@ Provide macros for softnet_lock and KERNEL_LOCK hiding NET_MPSAFE switch It reduces C&P codes such as "#ifndef NET_MPSAFE KERNEL_LOCK(1, NULL); ..." scattered all over the source code and makes it easy to identify remaining KERNEL_LOCK and/or softnet_lock that are held even if NET_MPSAFE. No functional change Hold KERNEL_LOCK on if_ioctl selectively based on IFEF_MPSAFE If IFEF_MPSAFE is set, hold the lock and otherwise don't hold. This change requires additions of KERNEL_LOCK to subsequence functions from if_ioctl such as ifmedia_ioctl and ifioctl_common to protect non-MP-safe components. Proposed on tech-kern@ and tech-net@ Ensure to hold if_ioctl_lock when calling if_flags_set Fix locking against myself on ifpromisc vlan_unconfig_locked could be called with holding if_ioctl_lock. Ensure to not turn on IFF_RUNNING of an interface until its initialization completes And ensure to turn off it before destruction as per IFF_RUNNING's description "resource allocated". (The description is a bit doubtful though, I believe the change is still proper.) Ensure to hold if_ioctl_lock on if_up and if_down One exception for if_down is if_detach; in the case the lock isn't needed because it's guaranteed that no other one can access ifp at that point. Make if_link_queue MP-safe if IFEF_MPSAFE if_link_queue is a queue to store events of link state changes, which is used to pass events from (typically) an interrupt handler to if_link_state_change softint. The queue was protected by KERNEL_LOCK so far, but if IFEF_MPSAFE is enabled, it becomes unsafe because (perhaps) an interrupt handler of an interface with IFEF_MPSAFE doesn't take KERNEL_LOCK. Protect it by a spin mutex. Additionally with this change KERNEL_LOCK of if_link_state_change softint is omitted if NET_MPSAFE is enabled. Note that the spin mutex is now ifp->if_snd.ifq_lock as well as the case of if_timer (see the comment). Use IFADDR_WRITER_FOREACH instead of IFADDR_READER_FOREACH At that point no other one modifies the list so IFADDR_READER_FOREACH is unnecessary. Use of IFADDR_READER_FOREACH is harmless in general though, if we try to detect contract violations of pserialize, using it violates the contract. So avoid using it makes life easy. Ensure to call if_addr_init with holding if_ioctl_lock Get rid of outdated comments Fix build of kernels without ether By throwing out if_enable_vlan_mtu and if_disable_vlan_mtu that created a unnecessary dependency from if.c to if_ethersubr.c. PR kern/52790 Rename IFNET_LOCK to IFNET_GLOBAL_LOCK IFNET_LOCK will be used in another lock, if_ioctl_lock (might be renamed then). Wrap if_ioctl_lock with IFNET_* macros (NFC) Also if_ioctl_lock perhaps needs to be renamed to something because it's now not just for ioctl... Reorder some destruction routines in if_detach - Destroy if_ioctl_lock at the end of the if_detach because it's used in various destruction routines - Move psref_target_destroy after pr_purgeif because we want to use psref in pr_purgeif (otherwise destruction procedures can be tricky) Ensure to call if_mcast_op with holding IFNET_LOCK Note that CARP doesn't deal with IFNET_LOCK yet. Remove IFNET_GLOBAL_LOCK where it's unnecessary because IFNET_LOCK is held Describe which lock is used to protect each member variable of struct ifnet Requested by skrll@ Write a guideline for converting an interface to IFEF_MPSAFE Requested by skrll@ Note that IFNET_LOCK must not be held in softint Don't set IFEF_MPSAFE unless NET_MPSAFE at this point Because recent investigations show that interfaces with IFEF_MPSAFE need to follow additional restrictions to work with the flag safely. We should enable it on an interface by default only if the interface surely satisfies the restrictions, which are described in if.h. Note that enabling IFEF_MPSAFE solely gains a few benefit on performance because the network stack is still serialized by the big kernel locks by default.
Revision 22.214.171.124 / (download) - annotate - [select for diffs], Sun Dec 10 09:24:30 2017 UTC (3 months, 1 week ago) by snj
Changes since 126.96.36.199: +23 -3 lines
Diff to previous 188.8.131.52 (colored) to branchpoint 1.178 (colored)
Pull up following revision(s) (requested by roy in ticket #390): sys/netinet/ip_input.c: 1.363 sys/netinet6/ip6_input.c: 1.184-1.185 sys/netinet6/ip6_output.c: 1.194-1.195 sys/netinet6/in6_src.c: 1.83-1.84 Allow local communication over DETACHED addresses. Allow binding to DETACHED or TENTATIVE addresses as we deny sending upstream from them anyway. Prefer non DETACHED or TENTATIVE addresses. -- Attempt to restore v6 networking. Not 100% certain that these changes are all that is needed, but they're certainly a big part of it (especially the ip6_input.c change.) -- Treat unvalidated addresses as deprecated in rule 3.
Revision 184.108.40.206 / (download) - annotate - [select for diffs], Sat Oct 21 19:43:54 2017 UTC (4 months, 4 weeks ago) by snj
CVS Tags: matt-nb8-mediatek-base, matt-nb8-mediatek
Changes since 1.178: +2 -6 lines
Diff to previous 1.178 (colored)
Pull up following revision(s) (requested by ozaki-r in ticket #300): crypto/dist/ipsec-tools/src/setkey/parse.y: 1.19 crypto/dist/ipsec-tools/src/setkey/token.l: 1.20 distrib/sets/lists/tests/mi: 1.754, 1.757, 1.759 doc/TODO.smpnet: 1.12-1.13 sys/net/pfkeyv2.h: 1.32 sys/net/raw_cb.c: 1.23-1.24, 1.28 sys/net/raw_cb.h: 1.28 sys/net/raw_usrreq.c: 1.57-1.58 sys/net/rtsock.c: 1.228-1.229 sys/netinet/in_proto.c: 1.125 sys/netinet/ip_input.c: 1.359-1.361 sys/netinet/tcp_input.c: 1.359-1.360 sys/netinet/tcp_output.c: 1.197 sys/netinet/tcp_var.h: 1.178 sys/netinet6/icmp6.c: 1.213 sys/netinet6/in6_proto.c: 1.119 sys/netinet6/ip6_forward.c: 1.88 sys/netinet6/ip6_input.c: 1.181-1.182 sys/netinet6/ip6_output.c: 1.193 sys/netinet6/ip6protosw.h: 1.26 sys/netipsec/ipsec.c: 1.100-1.122 sys/netipsec/ipsec.h: 1.51-1.61 sys/netipsec/ipsec6.h: 1.18-1.20 sys/netipsec/ipsec_input.c: 1.44-1.51 sys/netipsec/ipsec_netbsd.c: 1.41-1.45 sys/netipsec/ipsec_output.c: 1.49-1.64 sys/netipsec/ipsec_private.h: 1.5 sys/netipsec/key.c: 1.164-1.234 sys/netipsec/key.h: 1.20-1.32 sys/netipsec/key_debug.c: 1.18-1.21 sys/netipsec/key_debug.h: 1.9 sys/netipsec/keydb.h: 1.16-1.20 sys/netipsec/keysock.c: 1.59-1.62 sys/netipsec/keysock.h: 1.10 sys/netipsec/xform.h: 1.9-1.12 sys/netipsec/xform_ah.c: 1.55-1.74 sys/netipsec/xform_esp.c: 1.56-1.72 sys/netipsec/xform_ipcomp.c: 1.39-1.53 sys/netipsec/xform_ipip.c: 1.50-1.54 sys/netipsec/xform_tcp.c: 1.12-1.16 sys/rump/librump/rumpkern/Makefile.rumpkern: 1.170 sys/rump/librump/rumpnet/net_stub.c: 1.27 sys/sys/protosw.h: 1.67-1.68 tests/net/carp/t_basic.sh: 1.7 tests/net/if_gif/t_gif.sh: 1.11 tests/net/if_l2tp/t_l2tp.sh: 1.3 tests/net/ipsec/Makefile: 1.7-1.9 tests/net/ipsec/algorithms.sh: 1.5 tests/net/ipsec/common.sh: 1.4-1.6 tests/net/ipsec/t_ipsec_ah_keys.sh: 1.2 tests/net/ipsec/t_ipsec_esp_keys.sh: 1.2 tests/net/ipsec/t_ipsec_gif.sh: 1.6-1.7 tests/net/ipsec/t_ipsec_l2tp.sh: 1.6-1.7 tests/net/ipsec/t_ipsec_misc.sh: 1.8-1.18 tests/net/ipsec/t_ipsec_sockopt.sh: 1.1-1.2 tests/net/ipsec/t_ipsec_tcp.sh: 1.1-1.2 tests/net/ipsec/t_ipsec_transport.sh: 1.5-1.6 tests/net/ipsec/t_ipsec_tunnel.sh: 1.9 tests/net/ipsec/t_ipsec_tunnel_ipcomp.sh: 1.1-1.2 tests/net/ipsec/t_ipsec_tunnel_odd.sh: 1.3 tests/net/mcast/t_mcast.sh: 1.6 tests/net/net/t_ipaddress.sh: 1.11 tests/net/net_common.sh: 1.20 tests/net/npf/t_npf.sh: 1.3 tests/net/route/t_flags.sh: 1.20 tests/net/route/t_flags6.sh: 1.16 usr.bin/netstat/fast_ipsec.c: 1.22 Do m_pullup before mtod It may fix panicks of some tests on anita/sparc and anita/GuruPlug. --- KNF --- Enable DEBUG for babylon5 --- Apply C99-style struct initialization to xformsw --- Tweak outputs of netstat -s for IPsec - Get rid of "Fast" - Use ipsec and ipsec6 for titles to clarify protocol - Indent outputs of sub protocols Original outputs were organized like this: (Fast) IPsec: IPsec ah: IPsec esp: IPsec ipip: IPsec ipcomp: (Fast) IPsec: IPsec ah: IPsec esp: IPsec ipip: IPsec ipcomp: New outputs are organized like this: ipsec: ah: esp: ipip: ipcomp: ipsec6: ah: esp: ipip: ipcomp: --- Add test cases for IPComp --- Simplify IPSEC_OSTAT macro (NFC) --- KNF; replace leading whitespaces with hard tabs --- Introduce and use SADB_SASTATE_USABLE_P --- KNF --- Add update command for testing Updating an SA (SADB_UPDATE) requires that a process issuing SADB_UPDATE is the same as a process issued SADB_ADD (or SADB_GETSPI). This means that update command must be used with add command in a configuration of setkey. This usage is normally meaningless but useful for testing (and debugging) purposes. --- Add test cases for updating SA/SP The tests require newly-added udpate command of setkey. --- PR/52346: Frank Kardel: Fix checksumming for NAT-T See XXX for improvements. --- Remove codes for PACKET_TAG_IPSEC_IN_CRYPTO_DONE It seems that PACKET_TAG_IPSEC_IN_CRYPTO_DONE is for network adapters that have IPsec accelerators; a driver sets the mtag to a packet when its device has already encrypted the packet. Unfortunately no driver implements such offload features for long years and seems unlikely to implement them soon. (Note that neither FreeBSD nor Linux doesn't have such drivers.) Let's remove related (unused) codes and simplify the IPsec code. --- Fix usages of sadb_msg_errno --- Avoid updating sav directly On SADB_UPDATE a target sav was updated directly, which was unsafe. Instead allocate another sav, copy variables of the old sav to the new one and replace the old one with the new one. --- Simplify; we can assume sav->tdb_xform cannot be NULL while it's valid --- Rename key_alloc* functions (NFC) We shouldn't use the term "alloc" for functions that just look up data and actually don't allocate memory. --- Use explicit_memset to surely zero-clear key_auth and key_enc --- Make sure to clear keys on error paths of key_setsaval --- Add missing KEY_FREESAV --- Make sure a sav is inserted to a sah list after its initialization completes --- Remove unnecessary zero-clearing codes from key_setsaval key_setsaval is now used only for a newly-allocated sav. (It was used to reset variables of an existing sav.) --- Correct wrong assumption of sav->refcnt in key_delsah A sav in a list is basically not to be sav->refcnt == 0. And also KEY_FREESAV assumes sav->refcnt > 0. --- Let key_getsavbyspi take a reference of a returning sav --- Use time_mono_to_wall (NFC) --- Separate sending message routine (NFC) --- Simplify; remove unnecessary zero-clears key_freesaval is used only when a target sav is being destroyed. --- Omit NULL checks for sav->lft_c sav->lft_c can be NULL only when initializing or destroying sav. --- Omit unnecessary NULL checks for sav->sah --- Omit unnecessary check of sav->state key_allocsa_policy picks a sav of either MATURE or DYING so we don't need to check its state again. --- Simplify; omit unnecessary saidx passing - ipsec_nextisr returns a saidx but no caller uses it - key_checkrequest is passed a saidx but it can be gotton by another argument (isr) --- Fix splx isn't called on some error paths --- Fix header size calculation of esp where sav is NULL --- Fix header size calculation of ah in the case sav is NULL This fix was also needed for esp. --- Pass sav directly to opencrypto callback In a callback, use a passed sav as-is by default and look up a sav only if the passed sav is dead. --- Avoid examining freshness of sav on packet processing If a sav list is sorted (by lft_c->sadb_lifetime_addtime) in advance, we don't need to examine each sav and also don't need to delete one on the fly and send up a message. Fortunately every sav lists are sorted as we need. Added key_validate_savlist validates that each sav list is surely sorted (run only if DEBUG because it's not cheap). --- Add test cases for SAs with different SPIs --- Prepare to stop using isr->sav isr is a shared resource and using isr->sav as a temporal storage for each packet processing is racy. And also having a reference from isr to sav makes the lifetime of sav non-deterministic; such a reference is removed when a packet is processed and isr->sav is overwritten by new one. Let's have a sav locally for each packet processing instead of using shared isr->sav. However this change doesn't stop using isr->sav yet because there are some users of isr->sav. isr->sav will be removed after the users find a way to not use isr->sav. --- Fix wrong argument handling --- fix printf format. --- Don't validate sav lists of LARVAL or DEAD states We don't sort the lists so the validation will always fail. Fix PR kern/52405 --- Make sure to sort the list when changing the state by key_sa_chgstate --- Rename key_allocsa_policy to key_lookup_sa_bysaidx --- Separate test files --- Calculate ah_max_authsize on initialization as well as esp_max_ivlen --- Remove m_tag_find(PACKET_TAG_IPSEC_PENDING_TDB) because nobody sets the tag --- Restore a comment removed in previous The comment is valid for the below code. --- Make tests more stable sleep command seems to wait longer than expected on anita so use polling to wait for a state change. --- Add tests that explicitly delete SAs instead of waiting for expirations --- Remove invalid M_AUTHIPDGM check on ESP isr->sav M_AUTHIPDGM flag is set to a mbuf in ah_input_cb. An sav of ESP can have AH authentication as sav->tdb_authalgxform. However, in that case esp_input and esp_input_cb are used to do ESP decryption and AH authentication and M_AUTHIPDGM never be set to a mbuf. So checking M_AUTHIPDGM of a mbuf on isr->sav of ESP is meaningless. --- Look up sav instead of relying on unstable sp->req->sav This code is executed only in an error path so an additional lookup doesn't matter. --- Correct a comment --- Don't release sav if calling crypto_dispatch again --- Remove extra KEY_FREESAV from ipsec_process_done It should be done by the caller. --- Don't bother the case of crp->crp_buf == NULL in callbacks --- Hold a reference to an SP during opencrypto processing An SP has a list of isr (ipsecrequest) that represents a sequence of IPsec encryption/authentication processing. One isr corresponds to one opencrypto processing. The lifetime of an isr follows its SP. We pass an isr to a callback function of opencrypto to continue to a next encryption/authentication processing. However nobody guaranteed that the isr wasn't freed, i.e., its SP wasn't destroyed. In order to avoid such unexpected destruction of isr, hold a reference to its SP during opencrypto processing. --- Don't make SAs expired on tests that delete SAs explicitly --- Fix a debug message --- Dedup error paths (NFC) --- Use pool to allocate tdb_crypto For ESP and AH, we need to allocate an extra variable space in addition to struct tdb_crypto. The fixed size of pool items may be larger than an actual requisite size of a buffer, but still the performance improvement by replacing malloc with pool wins. --- Don't use unstable isr->sav for header size calculations We may need to optimize to not look up sav here for users that don't need to know an exact size of headers (e.g., TCP segmemt size caclulation). --- Don't use sp->req->sav when handling NAT-T ESP fragmentation In order to do this we need to look up a sav however an additional look-up degrades performance. A sav is later looked up in ipsec4_process_packet so delay the fragmentation check until then to avoid an extra look-up. --- Don't use key_lookup_sp that depends on unstable sp->req->sav It provided a fast look-up of SP. We will provide an alternative method in the future (after basic MP-ification finishes). --- Stop setting isr->sav on looking up sav in key_checkrequest --- Remove ipsecrequest#sav --- Stop setting mtag of PACKET_TAG_IPSEC_IN_DONE because there is no users anymore --- Skip ipsec_spi_*_*_preferred_new_timeout when running on qemu Probably due to PR 43997 --- Add localcount to rump kernels --- Remove unused macro --- Fix key_getcomb_setlifetime The fix adjusts a soft limit to be 80% of a corresponding hard limit. I'm not sure the fix is really correct though, at least the original code is wrong. A passed comb is zero-cleared before calling key_getcomb_setlifetime, so comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; is meaningless. --- Provide and apply key_sp_refcnt (NFC) It simplifies further changes. --- Fix indentation Pointed out by knakahara@ --- Use pslist(9) for sptree --- Don't acquire global locks for IPsec if NET_MPSAFE Note that the change is just to make testing easy and IPsec isn't MP-safe yet. --- Let PF_KEY socks hold their own lock instead of softnet_lock Operations on SAD and SPD are executed via PF_KEY socks. The operations include deletions of SAs and SPs that will use synchronization mechanisms such as pserialize_perform to wait for references to SAs and SPs to be released. It is known that using such mechanisms with holding softnet_lock causes a dead lock. We should avoid the situation. --- Make IPsec SPD MP-safe We use localcount(9), not psref(9), to make the sptree and secpolicy (SP) entries MP-safe because SPs need to be referenced over opencrypto processing that executes a callback in a different context. SPs on sockets aren't managed by the sptree and can be destroyed in softint. localcount_drain cannot be used in softint so we delay the destruction of such SPs to a thread context. To do so, a list to manage such SPs is added (key_socksplist) and key_timehandler_spd deletes dead SPs in the list. For more details please read the locking notes in key.c. Proposed on tech-kern@ and tech-net@ --- Fix updating ipsec_used - key_update_used wasn't called in key_api_spddelete2 and key_api_spdflush - key_update_used wasn't called if an SP had been added/deleted but a reply to userland failed --- Fix updating ipsec_used; turn on when SPs on sockets are added --- Add missing IPsec policy checks to icmp6_rip6_input icmp6_rip6_input is quite similar to rip6_input and the same checks exist in rip6_input. --- Add test cases for setsockopt(IP_IPSEC_POLICY) --- Don't use KEY_NEWSP for dummy SP entries By the change KEY_NEWSP is now not called from softint anymore and we can use kmem_zalloc with KM_SLEEP for KEY_NEWSP. --- Comment out unused functions --- Add test cases that there are SPs but no relevant SAs --- Don't allow sav->lft_c to be NULL lft_c of an sav that was created by SADB_GETSPI could be NULL. --- Clean up clunky eval strings - Remove unnecessary \ at EOL - This allows to omit ; too - Remove unnecessary quotes for arguments of atf_set - Don't expand $DEBUG in eval - We expect it's expanded on execution Suggested by kre@ --- Remove unnecessary KEY_FREESAV in an error path sav should be freed (unreferenced) by the caller. --- Use pslist(9) for sahtree --- Use pslist(9) for sah->savtree --- Rename local variable newsah to sah It may not be new. --- MP-ify SAD slightly - Introduce key_sa_mtx and use it for some list operations - Use pserialize for some list iterations --- Introduce KEY_SA_UNREF and replace KEY_FREESAV with it where sav will never be actually freed in the future KEY_SA_UNREF is still key_freesav so no functional change for now. This change reduces diff of further changes. --- Remove out-of-date log output Pointed out by riastradh@ --- Use KDASSERT instead of KASSERT for mutex_ownable Because mutex_ownable is too heavy to run in a fast path even for DIAGNOSTIC + LOCKDEBUG. Suggested by riastradh@ --- Assemble global lists and related locks into cache lines (NFCI) Also rename variable names from *tree to *list because they are just lists, not trees. Suggested by riastradh@ --- Move locking notes --- Update the locking notes - Add locking order - Add locking notes for misc lists such as reglist - Mention pserialize, key_sp_ref and key_sp_unref on SP operations Requested by riastradh@ --- Describe constraints of key_sp_ref and key_sp_unref Requested by riastradh@ --- Hold key_sad.lock on SAVLIST_WRITER_INSERT_TAIL --- Add __read_mostly to key_psz Suggested by riastradh@ --- Tweak wording (pserialize critical section => pserialize read section) Suggested by riastradh@ --- Add missing mutex_exit --- Fix setkey -D -P outputs The outputs were tweaked (by me), but I forgot updating libipsec in my local ATF environment... --- MP-ify SAD (key_sad.sahlist and sah entries) localcount(9) is used to protect key_sad.sahlist and sah entries as well as SPD (and will be used for SAD sav). Please read the locking notes of SAD for more details. --- Introduce key_sa_refcnt and replace sav->refcnt with it (NFC) --- Destroy sav only in the loop for DEAD sav --- Fix KASSERT(solocked(sb->sb_so)) failure in sbappendaddr that is called eventually from key_sendup_mbuf If key_sendup_mbuf isn't passed a socket, the assertion fails. Originally in this case sb->sb_so was softnet_lock and callers held softnet_lock so the assertion was magically satisfied. Now sb->sb_so is key_so_mtx and also softnet_lock isn't always held by callers so the assertion can fail. Fix it by holding key_so_mtx if key_sendup_mbuf isn't passed a socket. Reported by knakahara@ Tested by knakahara@ and ozaki-r@ --- Fix locking notes of SAD --- Fix deadlock between key_sendup_mbuf called from key_acquire and localcount_drain If we call key_sendup_mbuf from key_acquire that is called on packet processing, a deadlock can happen like this: - At key_acquire, a reference to an SP (and an SA) is held - key_sendup_mbuf will try to take key_so_mtx - Some other thread may try to localcount_drain to the SP with holding key_so_mtx in say key_api_spdflush - In this case localcount_drain never return because key_sendup_mbuf that has stuck on key_so_mtx never release a reference to the SP Fix the deadlock by deferring key_sendup_mbuf to the timer (key_timehandler). --- Fix that prev isn't cleared on retry --- Limit the number of mbufs queued for deferred key_sendup_mbuf It's easy to be queued hundreds of mbufs on the list under heavy network load. --- MP-ify SAD (savlist) localcount(9) is used to protect savlist of sah. The basic design is similar to MP-ifications of SPD and SAD sahlist. Please read the locking notes of SAD for more details. --- Simplify ipsec_reinject_ipstack (NFC) --- Add per-CPU rtcache to ipsec_reinject_ipstack It reduces route lookups and also reduces rtcache lock contentions when NET_MPSAFE is enabled. --- Use pool_cache(9) instead of pool(9) for tdb_crypto objects The change improves network throughput especially on multi-core systems. --- Update ipsec(4), opencrypto(9) and vlan(4) are now MP-safe. --- Write known issues on scalability --- Share a global dummy SP between PCBs It's never be changed so it can be pre-allocated and shared safely between PCBs. --- Fix race condition on the rawcb list shared by rtsock and keysock keysock now protects itself by its own mutex, which means that the rawcb list is protected by two different mutexes (keysock's one and softnet_lock for rtsock), of course it's useless. Fix the situation by having a discrete rawcb list for each. --- Use a dedicated mutex for rt_rawcb instead of softnet_lock if NET_MPSAFE --- fix localcount leak in sav. fixed by firstname.lastname@example.org. I commit on behalf of him. --- remove unnecessary comment. --- Fix deadlock between pserialize_perform and localcount_drain A typical ussage of localcount_drain looks like this: mutex_enter(&mtx); item = remove_from_list(); pserialize_perform(psz); localcount_drain(&item->localcount, &cv, &mtx); mutex_exit(&mtx); This sequence can cause a deadlock which happens for example on the following situation: - Thread A calls localcount_drain which calls xc_broadcast after releasing a specified mutex - Thread B enters the sequence and calls pserialize_perform with holding the mutex while pserialize_perform also calls xc_broadcast - Thread C (xc_thread) that calls an xcall callback of localcount_drain tries to hold the mutex xc_broadcast of thread B doesn't start until xc_broadcast of thread A finishes, which is a feature of xcall(9). This means that pserialize_perform never complete until xc_broadcast of thread A finishes. On the other hand, thread C that is a callee of xc_broadcast of thread A sticks on the mutex. Finally the threads block each other (A blocks B, B blocks C and C blocks A). A possible fix is to serialize executions of the above sequence by another mutex, but adding another mutex makes the code complex, so fix the deadlock by another way; the fix is to release the mutex before pserialize_perform and instead use a condvar to prevent pserialize_perform from being called simultaneously. Note that the deadlock has happened only if NET_MPSAFE is enabled. --- Add missing ifdef NET_MPSAFE --- Take softnet_lock on pr_input properly if NET_MPSAFE Currently softnet_lock is taken unnecessarily in some cases, e.g., icmp_input and encap4_input from ip_input, or not taken even if needed, e.g., udp_input and tcp_input from ipsec4_common_input_cb. Fix them. NFC if NET_MPSAFE is disabled (default). --- - sanitize key debugging so that we don't print extra newlines or unassociated debugging messages. - remove unused functions and make internal ones static - print information in one line per message --- humanize printing of ip addresses --- cast reduction, NFC. --- Fix typo in comment --- Pull out ipsec_fill_saidx_bymbuf (NFC) --- Don't abuse key_checkrequest just for looking up sav It does more than expected for example key_acquire. --- Fix SP is broken on transport mode isr->saidx was modified accidentally in ipsec_nextisr. Reported by christos@ Helped investigations by christos@ and knakahara@ --- Constify isr at many places (NFC) --- Include socketvar.h for softnet_lock --- Fix buffer length for ipsec_logsastr
Revision 1.178 / (download) - annotate - [select for diffs], Thu Jun 1 02:45:14 2017 UTC (9 months, 2 weeks ago) by chs
CVS Tags: netbsd-8-base
Branch point for: netbsd-8
Changes since 1.177: +2 -5 lines
Diff to previous 1.177 (colored)
remove checks for failure after memory allocation calls that cannot fail: kmem_alloc() with KM_SLEEP kmem_zalloc() with KM_SLEEP percpu_alloc() pserialize_create() psref_class_create() all of these paths include an assertion that the allocation has not failed, so callers should not assert that again.
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