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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /fs/lockd/host.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'fs/lockd/host.c')
-rw-r--r-- | fs/lockd/host.c | 694 |
1 files changed, 694 insertions, 0 deletions
diff --git a/fs/lockd/host.c b/fs/lockd/host.c new file mode 100644 index 000000000..cdc8e12cd --- /dev/null +++ b/fs/lockd/host.c @@ -0,0 +1,694 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/lockd/host.c + * + * Management for NLM peer hosts. The nlm_host struct is shared + * between client and server implementation. The only reason to + * do so is to reduce code bloat. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/addr.h> +#include <linux/sunrpc/svc.h> +#include <linux/lockd/lockd.h> +#include <linux/mutex.h> + +#include <linux/sunrpc/svc_xprt.h> + +#include <net/ipv6.h> + +#include "netns.h" + +#define NLMDBG_FACILITY NLMDBG_HOSTCACHE +#define NLM_HOST_NRHASH 32 +#define NLM_HOST_REBIND (60 * HZ) +#define NLM_HOST_EXPIRE (300 * HZ) +#define NLM_HOST_COLLECT (120 * HZ) + +static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH]; +static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH]; + +#define for_each_host(host, chain, table) \ + for ((chain) = (table); \ + (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ + hlist_for_each_entry((host), (chain), h_hash) + +#define for_each_host_safe(host, next, chain, table) \ + for ((chain) = (table); \ + (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ + hlist_for_each_entry_safe((host), (next), \ + (chain), h_hash) + +static unsigned long nrhosts; +static DEFINE_MUTEX(nlm_host_mutex); + +static void nlm_gc_hosts(struct net *net); + +struct nlm_lookup_host_info { + const int server; /* search for server|client */ + const struct sockaddr *sap; /* address to search for */ + const size_t salen; /* it's length */ + const unsigned short protocol; /* transport to search for*/ + const u32 version; /* NLM version to search for */ + const char *hostname; /* remote's hostname */ + const size_t hostname_len; /* it's length */ + const int noresvport; /* use non-priv port */ + struct net *net; /* network namespace to bind */ + const struct cred *cred; +}; + +/* + * Hash function must work well on big- and little-endian platforms + */ +static unsigned int __nlm_hash32(const __be32 n) +{ + unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); + return hash ^ (hash >> 8); +} + +static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) +{ + const struct sockaddr_in *sin = (struct sockaddr_in *)sap; + return __nlm_hash32(sin->sin_addr.s_addr); +} + +static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) +{ + const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; + const struct in6_addr addr = sin6->sin6_addr; + return __nlm_hash32(addr.s6_addr32[0]) ^ + __nlm_hash32(addr.s6_addr32[1]) ^ + __nlm_hash32(addr.s6_addr32[2]) ^ + __nlm_hash32(addr.s6_addr32[3]); +} + +static unsigned int nlm_hash_address(const struct sockaddr *sap) +{ + unsigned int hash; + + switch (sap->sa_family) { + case AF_INET: + hash = __nlm_hash_addr4(sap); + break; + case AF_INET6: + hash = __nlm_hash_addr6(sap); + break; + default: + hash = 0; + } + return hash & (NLM_HOST_NRHASH - 1); +} + +/* + * Allocate and initialize an nlm_host. Common to both client and server. + */ +static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni, + struct nsm_handle *nsm) +{ + struct nlm_host *host = NULL; + unsigned long now = jiffies; + + if (nsm != NULL) + refcount_inc(&nsm->sm_count); + else { + host = NULL; + nsm = nsm_get_handle(ni->net, ni->sap, ni->salen, + ni->hostname, ni->hostname_len); + if (unlikely(nsm == NULL)) { + dprintk("lockd: %s failed; no nsm handle\n", + __func__); + goto out; + } + } + + host = kmalloc(sizeof(*host), GFP_KERNEL); + if (unlikely(host == NULL)) { + dprintk("lockd: %s failed; no memory\n", __func__); + nsm_release(nsm); + goto out; + } + + memcpy(nlm_addr(host), ni->sap, ni->salen); + host->h_addrlen = ni->salen; + rpc_set_port(nlm_addr(host), 0); + host->h_srcaddrlen = 0; + + host->h_rpcclnt = NULL; + host->h_name = nsm->sm_name; + host->h_version = ni->version; + host->h_proto = ni->protocol; + host->h_reclaiming = 0; + host->h_server = ni->server; + host->h_noresvport = ni->noresvport; + host->h_inuse = 0; + init_waitqueue_head(&host->h_gracewait); + init_rwsem(&host->h_rwsem); + host->h_state = 0; + host->h_nsmstate = 0; + host->h_pidcount = 0; + refcount_set(&host->h_count, 1); + mutex_init(&host->h_mutex); + host->h_nextrebind = now + NLM_HOST_REBIND; + host->h_expires = now + NLM_HOST_EXPIRE; + INIT_LIST_HEAD(&host->h_lockowners); + spin_lock_init(&host->h_lock); + INIT_LIST_HEAD(&host->h_granted); + INIT_LIST_HEAD(&host->h_reclaim); + host->h_nsmhandle = nsm; + host->h_addrbuf = nsm->sm_addrbuf; + host->net = ni->net; + host->h_cred = get_cred(ni->cred); + strscpy(host->nodename, utsname()->nodename, sizeof(host->nodename)); + +out: + return host; +} + +/* + * Destroy an nlm_host and free associated resources + * + * Caller must hold nlm_host_mutex. + */ +static void nlm_destroy_host_locked(struct nlm_host *host) +{ + struct rpc_clnt *clnt; + struct lockd_net *ln = net_generic(host->net, lockd_net_id); + + dprintk("lockd: destroy host %s\n", host->h_name); + + hlist_del_init(&host->h_hash); + + nsm_unmonitor(host); + nsm_release(host->h_nsmhandle); + + clnt = host->h_rpcclnt; + if (clnt != NULL) + rpc_shutdown_client(clnt); + put_cred(host->h_cred); + kfree(host); + + ln->nrhosts--; + nrhosts--; +} + +/** + * nlmclnt_lookup_host - Find an NLM host handle matching a remote server + * @sap: network address of server + * @salen: length of server address + * @protocol: transport protocol to use + * @version: NLM protocol version + * @hostname: '\0'-terminated hostname of server + * @noresvport: 1 if non-privileged port should be used + * @net: pointer to net namespace + * @cred: pointer to cred + * + * Returns an nlm_host structure that matches the passed-in + * [server address, transport protocol, NLM version, server hostname]. + * If one doesn't already exist in the host cache, a new handle is + * created and returned. + */ +struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, + const size_t salen, + const unsigned short protocol, + const u32 version, + const char *hostname, + int noresvport, + struct net *net, + const struct cred *cred) +{ + struct nlm_lookup_host_info ni = { + .server = 0, + .sap = sap, + .salen = salen, + .protocol = protocol, + .version = version, + .hostname = hostname, + .hostname_len = strlen(hostname), + .noresvport = noresvport, + .net = net, + .cred = cred, + }; + struct hlist_head *chain; + struct nlm_host *host; + struct nsm_handle *nsm = NULL; + struct lockd_net *ln = net_generic(net, lockd_net_id); + + dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, + (hostname ? hostname : "<none>"), version, + (protocol == IPPROTO_UDP ? "udp" : "tcp")); + + mutex_lock(&nlm_host_mutex); + + chain = &nlm_client_hosts[nlm_hash_address(sap)]; + hlist_for_each_entry(host, chain, h_hash) { + if (host->net != net) + continue; + if (!rpc_cmp_addr(nlm_addr(host), sap)) + continue; + + /* Same address. Share an NSM handle if we already have one */ + if (nsm == NULL) + nsm = host->h_nsmhandle; + + if (host->h_proto != protocol) + continue; + if (host->h_version != version) + continue; + + nlm_get_host(host); + dprintk("lockd: %s found host %s (%s)\n", __func__, + host->h_name, host->h_addrbuf); + goto out; + } + + host = nlm_alloc_host(&ni, nsm); + if (unlikely(host == NULL)) + goto out; + + hlist_add_head(&host->h_hash, chain); + ln->nrhosts++; + nrhosts++; + + dprintk("lockd: %s created host %s (%s)\n", __func__, + host->h_name, host->h_addrbuf); + +out: + mutex_unlock(&nlm_host_mutex); + return host; +} + +/** + * nlmclnt_release_host - release client nlm_host + * @host: nlm_host to release + * + */ +void nlmclnt_release_host(struct nlm_host *host) +{ + if (host == NULL) + return; + + dprintk("lockd: release client host %s\n", host->h_name); + + WARN_ON_ONCE(host->h_server); + + if (refcount_dec_and_mutex_lock(&host->h_count, &nlm_host_mutex)) { + WARN_ON_ONCE(!list_empty(&host->h_lockowners)); + WARN_ON_ONCE(!list_empty(&host->h_granted)); + WARN_ON_ONCE(!list_empty(&host->h_reclaim)); + + nlm_destroy_host_locked(host); + mutex_unlock(&nlm_host_mutex); + } +} + +/** + * nlmsvc_lookup_host - Find an NLM host handle matching a remote client + * @rqstp: incoming NLM request + * @hostname: name of client host + * @hostname_len: length of client hostname + * + * Returns an nlm_host structure that matches the [client address, + * transport protocol, NLM version, client hostname] of the passed-in + * NLM request. If one doesn't already exist in the host cache, a + * new handle is created and returned. + * + * Before possibly creating a new nlm_host, construct a sockaddr + * for a specific source address in case the local system has + * multiple network addresses. The family of the address in + * rq_daddr is guaranteed to be the same as the family of the + * address in rq_addr, so it's safe to use the same family for + * the source address. + */ +struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, + const char *hostname, + const size_t hostname_len) +{ + struct hlist_head *chain; + struct nlm_host *host = NULL; + struct nsm_handle *nsm = NULL; + struct sockaddr *src_sap = svc_daddr(rqstp); + size_t src_len = rqstp->rq_daddrlen; + struct net *net = SVC_NET(rqstp); + struct nlm_lookup_host_info ni = { + .server = 1, + .sap = svc_addr(rqstp), + .salen = rqstp->rq_addrlen, + .protocol = rqstp->rq_prot, + .version = rqstp->rq_vers, + .hostname = hostname, + .hostname_len = hostname_len, + .net = net, + }; + struct lockd_net *ln = net_generic(net, lockd_net_id); + + dprintk("lockd: %s(host='%.*s', vers=%u, proto=%s)\n", __func__, + (int)hostname_len, hostname, rqstp->rq_vers, + (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); + + mutex_lock(&nlm_host_mutex); + + if (time_after_eq(jiffies, ln->next_gc)) + nlm_gc_hosts(net); + + chain = &nlm_server_hosts[nlm_hash_address(ni.sap)]; + hlist_for_each_entry(host, chain, h_hash) { + if (host->net != net) + continue; + if (!rpc_cmp_addr(nlm_addr(host), ni.sap)) + continue; + + /* Same address. Share an NSM handle if we already have one */ + if (nsm == NULL) + nsm = host->h_nsmhandle; + + if (host->h_proto != ni.protocol) + continue; + if (host->h_version != ni.version) + continue; + if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap)) + continue; + + /* Move to head of hash chain. */ + hlist_del(&host->h_hash); + hlist_add_head(&host->h_hash, chain); + + nlm_get_host(host); + dprintk("lockd: %s found host %s (%s)\n", + __func__, host->h_name, host->h_addrbuf); + goto out; + } + + host = nlm_alloc_host(&ni, nsm); + if (unlikely(host == NULL)) + goto out; + + memcpy(nlm_srcaddr(host), src_sap, src_len); + host->h_srcaddrlen = src_len; + hlist_add_head(&host->h_hash, chain); + ln->nrhosts++; + nrhosts++; + + refcount_inc(&host->h_count); + + dprintk("lockd: %s created host %s (%s)\n", + __func__, host->h_name, host->h_addrbuf); + +out: + mutex_unlock(&nlm_host_mutex); + return host; +} + +/** + * nlmsvc_release_host - release server nlm_host + * @host: nlm_host to release + * + * Host is destroyed later in nlm_gc_host(). + */ +void nlmsvc_release_host(struct nlm_host *host) +{ + if (host == NULL) + return; + + dprintk("lockd: release server host %s\n", host->h_name); + + WARN_ON_ONCE(!host->h_server); + refcount_dec(&host->h_count); +} + +/* + * Create the NLM RPC client for an NLM peer + */ +struct rpc_clnt * +nlm_bind_host(struct nlm_host *host) +{ + struct rpc_clnt *clnt; + + dprintk("lockd: nlm_bind_host %s (%s)\n", + host->h_name, host->h_addrbuf); + + /* Lock host handle */ + mutex_lock(&host->h_mutex); + + /* If we've already created an RPC client, check whether + * RPC rebind is required + */ + if ((clnt = host->h_rpcclnt) != NULL) { + nlm_rebind_host(host); + } else { + unsigned long increment = nlmsvc_timeout; + struct rpc_timeout timeparms = { + .to_initval = increment, + .to_increment = increment, + .to_maxval = increment * 6UL, + .to_retries = 5U, + }; + struct rpc_create_args args = { + .net = host->net, + .protocol = host->h_proto, + .address = nlm_addr(host), + .addrsize = host->h_addrlen, + .timeout = &timeparms, + .servername = host->h_name, + .program = &nlm_program, + .version = host->h_version, + .authflavor = RPC_AUTH_UNIX, + .flags = (RPC_CLNT_CREATE_NOPING | + RPC_CLNT_CREATE_AUTOBIND | + RPC_CLNT_CREATE_REUSEPORT), + .cred = host->h_cred, + }; + + /* + * lockd retries server side blocks automatically so we want + * those to be soft RPC calls. Client side calls need to be + * hard RPC tasks. + */ + if (!host->h_server) + args.flags |= RPC_CLNT_CREATE_HARDRTRY; + if (host->h_noresvport) + args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; + if (host->h_srcaddrlen) + args.saddress = nlm_srcaddr(host); + + clnt = rpc_create(&args); + if (!IS_ERR(clnt)) + host->h_rpcclnt = clnt; + else { + printk("lockd: couldn't create RPC handle for %s\n", host->h_name); + clnt = NULL; + } + } + + mutex_unlock(&host->h_mutex); + return clnt; +} + +/** + * nlm_rebind_host - If needed, force a portmap lookup of the peer's lockd port + * @host: NLM host handle for peer + * + * This is not needed when using a connection-oriented protocol, such as TCP. + * The existing autobind mechanism is sufficient to force a rebind when + * required, e.g. on connection state transitions. + */ +void +nlm_rebind_host(struct nlm_host *host) +{ + if (host->h_proto != IPPROTO_UDP) + return; + + if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { + rpc_force_rebind(host->h_rpcclnt); + host->h_nextrebind = jiffies + NLM_HOST_REBIND; + } +} + +/* + * Increment NLM host count + */ +struct nlm_host * nlm_get_host(struct nlm_host *host) +{ + if (host) { + dprintk("lockd: get host %s\n", host->h_name); + refcount_inc(&host->h_count); + host->h_expires = jiffies + NLM_HOST_EXPIRE; + } + return host; +} + +static struct nlm_host *next_host_state(struct hlist_head *cache, + struct nsm_handle *nsm, + const struct nlm_reboot *info) +{ + struct nlm_host *host; + struct hlist_head *chain; + + mutex_lock(&nlm_host_mutex); + for_each_host(host, chain, cache) { + if (host->h_nsmhandle == nsm + && host->h_nsmstate != info->state) { + host->h_nsmstate = info->state; + host->h_state++; + + nlm_get_host(host); + mutex_unlock(&nlm_host_mutex); + return host; + } + } + + mutex_unlock(&nlm_host_mutex); + return NULL; +} + +/** + * nlm_host_rebooted - Release all resources held by rebooted host + * @net: network namespace + * @info: pointer to decoded results of NLM_SM_NOTIFY call + * + * We were notified that the specified host has rebooted. Release + * all resources held by that peer. + */ +void nlm_host_rebooted(const struct net *net, const struct nlm_reboot *info) +{ + struct nsm_handle *nsm; + struct nlm_host *host; + + nsm = nsm_reboot_lookup(net, info); + if (unlikely(nsm == NULL)) + return; + + /* Mark all hosts tied to this NSM state as having rebooted. + * We run the loop repeatedly, because we drop the host table + * lock for this. + * To avoid processing a host several times, we match the nsmstate. + */ + while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) { + nlmsvc_free_host_resources(host); + nlmsvc_release_host(host); + } + while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) { + nlmclnt_recovery(host); + nlmclnt_release_host(host); + } + + nsm_release(nsm); +} + +static void nlm_complain_hosts(struct net *net) +{ + struct hlist_head *chain; + struct nlm_host *host; + + if (net) { + struct lockd_net *ln = net_generic(net, lockd_net_id); + + if (ln->nrhosts == 0) + return; + pr_warn("lockd: couldn't shutdown host module for net %x!\n", + net->ns.inum); + dprintk("lockd: %lu hosts left in net %x:\n", ln->nrhosts, + net->ns.inum); + } else { + if (nrhosts == 0) + return; + printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); + dprintk("lockd: %lu hosts left:\n", nrhosts); + } + + for_each_host(host, chain, nlm_server_hosts) { + if (net && host->net != net) + continue; + dprintk(" %s (cnt %d use %d exp %ld net %x)\n", + host->h_name, refcount_read(&host->h_count), + host->h_inuse, host->h_expires, host->net->ns.inum); + } +} + +void +nlm_shutdown_hosts_net(struct net *net) +{ + struct hlist_head *chain; + struct nlm_host *host; + + mutex_lock(&nlm_host_mutex); + + /* First, make all hosts eligible for gc */ + dprintk("lockd: nuking all hosts in net %x...\n", + net ? net->ns.inum : 0); + for_each_host(host, chain, nlm_server_hosts) { + if (net && host->net != net) + continue; + host->h_expires = jiffies - 1; + if (host->h_rpcclnt) { + rpc_shutdown_client(host->h_rpcclnt); + host->h_rpcclnt = NULL; + } + } + + /* Then, perform a garbage collection pass */ + nlm_gc_hosts(net); + nlm_complain_hosts(net); + mutex_unlock(&nlm_host_mutex); +} + +/* + * Shut down the hosts module. + * Note that this routine is called only at server shutdown time. + */ +void +nlm_shutdown_hosts(void) +{ + dprintk("lockd: shutting down host module\n"); + nlm_shutdown_hosts_net(NULL); +} + +/* + * Garbage collect any unused NLM hosts. + * This GC combines reference counting for async operations with + * mark & sweep for resources held by remote clients. + */ +static void +nlm_gc_hosts(struct net *net) +{ + struct hlist_head *chain; + struct hlist_node *next; + struct nlm_host *host; + + dprintk("lockd: host garbage collection for net %x\n", + net ? net->ns.inum : 0); + for_each_host(host, chain, nlm_server_hosts) { + if (net && host->net != net) + continue; + host->h_inuse = 0; + } + + /* Mark all hosts that hold locks, blocks or shares */ + nlmsvc_mark_resources(net); + + for_each_host_safe(host, next, chain, nlm_server_hosts) { + if (net && host->net != net) + continue; + if (host->h_inuse || time_before(jiffies, host->h_expires)) { + dprintk("nlm_gc_hosts skipping %s " + "(cnt %d use %d exp %ld net %x)\n", + host->h_name, refcount_read(&host->h_count), + host->h_inuse, host->h_expires, + host->net->ns.inum); + continue; + } + if (refcount_dec_if_one(&host->h_count)) + nlm_destroy_host_locked(host); + } + + if (net) { + struct lockd_net *ln = net_generic(net, lockd_net_id); + + ln->next_gc = jiffies + NLM_HOST_COLLECT; + } +} |