From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- net/9p/protocol.c | 792 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 792 insertions(+) create mode 100644 net/9p/protocol.c (limited to 'net/9p/protocol.c') diff --git a/net/9p/protocol.c b/net/9p/protocol.c new file mode 100644 index 000000000..4e3a2a1ff --- /dev/null +++ b/net/9p/protocol.c @@ -0,0 +1,792 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 9P Protocol Support Code + * + * Copyright (C) 2008 by Eric Van Hensbergen + * + * Base on code from Anthony Liguori + * Copyright (C) 2008 by IBM, Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "protocol.h" + +#include + +/* len[2] text[len] */ +#define P9_STRLEN(s) \ + (2 + min_t(size_t, s ? strlen(s) : 0, USHRT_MAX)) + +/** + * p9_msg_buf_size - Returns a buffer size sufficiently large to hold the + * intended 9p message. + * @c: client + * @type: message type + * @fmt: format template for assembling request message + * (see p9pdu_vwritef) + * @ap: variable arguments to be fed to passed format template + * (see p9pdu_vwritef) + * + * Note: Even for response types (P9_R*) the format template and variable + * arguments must always be for the originating request type (P9_T*). + */ +size_t p9_msg_buf_size(struct p9_client *c, enum p9_msg_t type, + const char *fmt, va_list ap) +{ + /* size[4] type[1] tag[2] */ + const int hdr = 4 + 1 + 2; + /* ename[s] errno[4] */ + const int rerror_size = hdr + P9_ERRMAX + 4; + /* ecode[4] */ + const int rlerror_size = hdr + 4; + const int err_size = + c->proto_version == p9_proto_2000L ? rlerror_size : rerror_size; + + static_assert(NAME_MAX <= 4*1024, "p9_msg_buf_size() currently assumes " + "a max. allowed directory entry name length of 4k"); + + switch (type) { + + /* message types not used at all */ + case P9_TERROR: + case P9_TLERROR: + case P9_TAUTH: + case P9_RAUTH: + BUG(); + + /* variable length & potentially large message types */ + case P9_TATTACH: + BUG_ON(strcmp("ddss?u", fmt)); + va_arg(ap, int32_t); + va_arg(ap, int32_t); + { + const char *uname = va_arg(ap, const char *); + const char *aname = va_arg(ap, const char *); + /* fid[4] afid[4] uname[s] aname[s] n_uname[4] */ + return hdr + 4 + 4 + P9_STRLEN(uname) + P9_STRLEN(aname) + 4; + } + case P9_TWALK: + BUG_ON(strcmp("ddT", fmt)); + va_arg(ap, int32_t); + va_arg(ap, int32_t); + { + uint i, nwname = va_arg(ap, int); + size_t wname_all; + const char **wnames = va_arg(ap, const char **); + for (i = 0, wname_all = 0; i < nwname; ++i) { + wname_all += P9_STRLEN(wnames[i]); + } + /* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */ + return hdr + 4 + 4 + 2 + wname_all; + } + case P9_RWALK: + BUG_ON(strcmp("ddT", fmt)); + va_arg(ap, int32_t); + va_arg(ap, int32_t); + { + uint nwname = va_arg(ap, int); + /* nwqid[2] nwqid*(wqid[13]) */ + return max_t(size_t, hdr + 2 + nwname * 13, err_size); + } + case P9_TCREATE: + BUG_ON(strcmp("dsdb?s", fmt)); + va_arg(ap, int32_t); + { + const char *name = va_arg(ap, const char *); + if (c->proto_version == p9_proto_legacy) { + /* fid[4] name[s] perm[4] mode[1] */ + return hdr + 4 + P9_STRLEN(name) + 4 + 1; + } else { + va_arg(ap, int32_t); + va_arg(ap, int); + { + const char *ext = va_arg(ap, const char *); + /* fid[4] name[s] perm[4] mode[1] extension[s] */ + return hdr + 4 + P9_STRLEN(name) + 4 + 1 + P9_STRLEN(ext); + } + } + } + case P9_TLCREATE: + BUG_ON(strcmp("dsddg", fmt)); + va_arg(ap, int32_t); + { + const char *name = va_arg(ap, const char *); + /* fid[4] name[s] flags[4] mode[4] gid[4] */ + return hdr + 4 + P9_STRLEN(name) + 4 + 4 + 4; + } + case P9_RREAD: + case P9_RREADDIR: + BUG_ON(strcmp("dqd", fmt)); + va_arg(ap, int32_t); + va_arg(ap, int64_t); + { + const int32_t count = va_arg(ap, int32_t); + /* count[4] data[count] */ + return max_t(size_t, hdr + 4 + count, err_size); + } + case P9_TWRITE: + BUG_ON(strcmp("dqV", fmt)); + va_arg(ap, int32_t); + va_arg(ap, int64_t); + { + const int32_t count = va_arg(ap, int32_t); + /* fid[4] offset[8] count[4] data[count] */ + return hdr + 4 + 8 + 4 + count; + } + case P9_TRENAMEAT: + BUG_ON(strcmp("dsds", fmt)); + va_arg(ap, int32_t); + { + const char *oldname, *newname; + oldname = va_arg(ap, const char *); + va_arg(ap, int32_t); + newname = va_arg(ap, const char *); + /* olddirfid[4] oldname[s] newdirfid[4] newname[s] */ + return hdr + 4 + P9_STRLEN(oldname) + 4 + P9_STRLEN(newname); + } + case P9_TSYMLINK: + BUG_ON(strcmp("dssg", fmt)); + va_arg(ap, int32_t); + { + const char *name = va_arg(ap, const char *); + const char *symtgt = va_arg(ap, const char *); + /* fid[4] name[s] symtgt[s] gid[4] */ + return hdr + 4 + P9_STRLEN(name) + P9_STRLEN(symtgt) + 4; + } + + case P9_RERROR: + return rerror_size; + case P9_RLERROR: + return rlerror_size; + + /* small message types */ + case P9_TWSTAT: + case P9_RSTAT: + case P9_RREADLINK: + case P9_TXATTRWALK: + case P9_TXATTRCREATE: + case P9_TLINK: + case P9_TMKDIR: + case P9_TMKNOD: + case P9_TRENAME: + case P9_TUNLINKAT: + case P9_TLOCK: + return 8 * 1024; + + /* tiny message types */ + default: + return 4 * 1024; + + } +} + +static int +p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); + +void p9stat_free(struct p9_wstat *stbuf) +{ + kfree(stbuf->name); + stbuf->name = NULL; + kfree(stbuf->uid); + stbuf->uid = NULL; + kfree(stbuf->gid); + stbuf->gid = NULL; + kfree(stbuf->muid); + stbuf->muid = NULL; + kfree(stbuf->extension); + stbuf->extension = NULL; +} +EXPORT_SYMBOL(p9stat_free); + +size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) +{ + size_t len = min(pdu->size - pdu->offset, size); + + memcpy(data, &pdu->sdata[pdu->offset], len); + pdu->offset += len; + return size - len; +} + +static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) +{ + size_t len = min(pdu->capacity - pdu->size, size); + + memcpy(&pdu->sdata[pdu->size], data, len); + pdu->size += len; + return size - len; +} + +static size_t +pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) +{ + size_t len = min(pdu->capacity - pdu->size, size); + + if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, from)) + len = 0; + + pdu->size += len; + return size - len; +} + +/* b - int8_t + * w - int16_t + * d - int32_t + * q - int64_t + * s - string + * u - numeric uid + * g - numeric gid + * S - stat + * Q - qid + * D - data blob (int32_t size followed by void *, results are not freed) + * T - array of strings (int16_t count, followed by strings) + * R - array of qids (int16_t count, followed by qids) + * A - stat for 9p2000.L (p9_stat_dotl) + * ? - if optional = 1, continue parsing + */ + +static int +p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, + va_list ap) +{ + const char *ptr; + int errcode = 0; + + for (ptr = fmt; *ptr; ptr++) { + switch (*ptr) { + case 'b':{ + int8_t *val = va_arg(ap, int8_t *); + if (pdu_read(pdu, val, sizeof(*val))) { + errcode = -EFAULT; + break; + } + } + break; + case 'w':{ + int16_t *val = va_arg(ap, int16_t *); + __le16 le_val; + if (pdu_read(pdu, &le_val, sizeof(le_val))) { + errcode = -EFAULT; + break; + } + *val = le16_to_cpu(le_val); + } + break; + case 'd':{ + int32_t *val = va_arg(ap, int32_t *); + __le32 le_val; + if (pdu_read(pdu, &le_val, sizeof(le_val))) { + errcode = -EFAULT; + break; + } + *val = le32_to_cpu(le_val); + } + break; + case 'q':{ + int64_t *val = va_arg(ap, int64_t *); + __le64 le_val; + if (pdu_read(pdu, &le_val, sizeof(le_val))) { + errcode = -EFAULT; + break; + } + *val = le64_to_cpu(le_val); + } + break; + case 's':{ + char **sptr = va_arg(ap, char **); + uint16_t len; + + errcode = p9pdu_readf(pdu, proto_version, + "w", &len); + if (errcode) + break; + + *sptr = kmalloc(len + 1, GFP_NOFS); + if (*sptr == NULL) { + errcode = -ENOMEM; + break; + } + if (pdu_read(pdu, *sptr, len)) { + errcode = -EFAULT; + kfree(*sptr); + *sptr = NULL; + } else + (*sptr)[len] = 0; + } + break; + case 'u': { + kuid_t *uid = va_arg(ap, kuid_t *); + __le32 le_val; + if (pdu_read(pdu, &le_val, sizeof(le_val))) { + errcode = -EFAULT; + break; + } + *uid = make_kuid(&init_user_ns, + le32_to_cpu(le_val)); + } break; + case 'g': { + kgid_t *gid = va_arg(ap, kgid_t *); + __le32 le_val; + if (pdu_read(pdu, &le_val, sizeof(le_val))) { + errcode = -EFAULT; + break; + } + *gid = make_kgid(&init_user_ns, + le32_to_cpu(le_val)); + } break; + case 'Q':{ + struct p9_qid *qid = + va_arg(ap, struct p9_qid *); + + errcode = p9pdu_readf(pdu, proto_version, "bdq", + &qid->type, &qid->version, + &qid->path); + } + break; + case 'S':{ + struct p9_wstat *stbuf = + va_arg(ap, struct p9_wstat *); + + memset(stbuf, 0, sizeof(struct p9_wstat)); + stbuf->n_uid = stbuf->n_muid = INVALID_UID; + stbuf->n_gid = INVALID_GID; + + errcode = + p9pdu_readf(pdu, proto_version, + "wwdQdddqssss?sugu", + &stbuf->size, &stbuf->type, + &stbuf->dev, &stbuf->qid, + &stbuf->mode, &stbuf->atime, + &stbuf->mtime, &stbuf->length, + &stbuf->name, &stbuf->uid, + &stbuf->gid, &stbuf->muid, + &stbuf->extension, + &stbuf->n_uid, &stbuf->n_gid, + &stbuf->n_muid); + if (errcode) + p9stat_free(stbuf); + } + break; + case 'D':{ + uint32_t *count = va_arg(ap, uint32_t *); + void **data = va_arg(ap, void **); + + errcode = + p9pdu_readf(pdu, proto_version, "d", count); + if (!errcode) { + *count = + min_t(uint32_t, *count, + pdu->size - pdu->offset); + *data = &pdu->sdata[pdu->offset]; + } + } + break; + case 'T':{ + uint16_t *nwname = va_arg(ap, uint16_t *); + char ***wnames = va_arg(ap, char ***); + + errcode = p9pdu_readf(pdu, proto_version, + "w", nwname); + if (!errcode) { + *wnames = + kmalloc_array(*nwname, + sizeof(char *), + GFP_NOFS); + if (!*wnames) + errcode = -ENOMEM; + } + + if (!errcode) { + int i; + + for (i = 0; i < *nwname; i++) { + errcode = + p9pdu_readf(pdu, + proto_version, + "s", + &(*wnames)[i]); + if (errcode) + break; + } + } + + if (errcode) { + if (*wnames) { + int i; + + for (i = 0; i < *nwname; i++) + kfree((*wnames)[i]); + } + kfree(*wnames); + *wnames = NULL; + } + } + break; + case 'R':{ + uint16_t *nwqid = va_arg(ap, uint16_t *); + struct p9_qid **wqids = + va_arg(ap, struct p9_qid **); + + *wqids = NULL; + + errcode = + p9pdu_readf(pdu, proto_version, "w", nwqid); + if (!errcode) { + *wqids = + kmalloc_array(*nwqid, + sizeof(struct p9_qid), + GFP_NOFS); + if (*wqids == NULL) + errcode = -ENOMEM; + } + + if (!errcode) { + int i; + + for (i = 0; i < *nwqid; i++) { + errcode = + p9pdu_readf(pdu, + proto_version, + "Q", + &(*wqids)[i]); + if (errcode) + break; + } + } + + if (errcode) { + kfree(*wqids); + *wqids = NULL; + } + } + break; + case 'A': { + struct p9_stat_dotl *stbuf = + va_arg(ap, struct p9_stat_dotl *); + + memset(stbuf, 0, sizeof(struct p9_stat_dotl)); + errcode = + p9pdu_readf(pdu, proto_version, + "qQdugqqqqqqqqqqqqqqq", + &stbuf->st_result_mask, + &stbuf->qid, + &stbuf->st_mode, + &stbuf->st_uid, &stbuf->st_gid, + &stbuf->st_nlink, + &stbuf->st_rdev, &stbuf->st_size, + &stbuf->st_blksize, &stbuf->st_blocks, + &stbuf->st_atime_sec, + &stbuf->st_atime_nsec, + &stbuf->st_mtime_sec, + &stbuf->st_mtime_nsec, + &stbuf->st_ctime_sec, + &stbuf->st_ctime_nsec, + &stbuf->st_btime_sec, + &stbuf->st_btime_nsec, + &stbuf->st_gen, + &stbuf->st_data_version); + } + break; + case '?': + if ((proto_version != p9_proto_2000u) && + (proto_version != p9_proto_2000L)) + return 0; + break; + default: + BUG(); + break; + } + + if (errcode) + break; + } + + return errcode; +} + +int +p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, + va_list ap) +{ + const char *ptr; + int errcode = 0; + + for (ptr = fmt; *ptr; ptr++) { + switch (*ptr) { + case 'b':{ + int8_t val = va_arg(ap, int); + if (pdu_write(pdu, &val, sizeof(val))) + errcode = -EFAULT; + } + break; + case 'w':{ + __le16 val = cpu_to_le16(va_arg(ap, int)); + if (pdu_write(pdu, &val, sizeof(val))) + errcode = -EFAULT; + } + break; + case 'd':{ + __le32 val = cpu_to_le32(va_arg(ap, int32_t)); + if (pdu_write(pdu, &val, sizeof(val))) + errcode = -EFAULT; + } + break; + case 'q':{ + __le64 val = cpu_to_le64(va_arg(ap, int64_t)); + if (pdu_write(pdu, &val, sizeof(val))) + errcode = -EFAULT; + } + break; + case 's':{ + const char *sptr = va_arg(ap, const char *); + uint16_t len = 0; + if (sptr) + len = min_t(size_t, strlen(sptr), + USHRT_MAX); + + errcode = p9pdu_writef(pdu, proto_version, + "w", len); + if (!errcode && pdu_write(pdu, sptr, len)) + errcode = -EFAULT; + } + break; + case 'u': { + kuid_t uid = va_arg(ap, kuid_t); + __le32 val = cpu_to_le32( + from_kuid(&init_user_ns, uid)); + if (pdu_write(pdu, &val, sizeof(val))) + errcode = -EFAULT; + } break; + case 'g': { + kgid_t gid = va_arg(ap, kgid_t); + __le32 val = cpu_to_le32( + from_kgid(&init_user_ns, gid)); + if (pdu_write(pdu, &val, sizeof(val))) + errcode = -EFAULT; + } break; + case 'Q':{ + const struct p9_qid *qid = + va_arg(ap, const struct p9_qid *); + errcode = + p9pdu_writef(pdu, proto_version, "bdq", + qid->type, qid->version, + qid->path); + } break; + case 'S':{ + const struct p9_wstat *stbuf = + va_arg(ap, const struct p9_wstat *); + errcode = + p9pdu_writef(pdu, proto_version, + "wwdQdddqssss?sugu", + stbuf->size, stbuf->type, + stbuf->dev, &stbuf->qid, + stbuf->mode, stbuf->atime, + stbuf->mtime, stbuf->length, + stbuf->name, stbuf->uid, + stbuf->gid, stbuf->muid, + stbuf->extension, stbuf->n_uid, + stbuf->n_gid, stbuf->n_muid); + } break; + case 'V':{ + uint32_t count = va_arg(ap, uint32_t); + struct iov_iter *from = + va_arg(ap, struct iov_iter *); + errcode = p9pdu_writef(pdu, proto_version, "d", + count); + if (!errcode && pdu_write_u(pdu, from, count)) + errcode = -EFAULT; + } + break; + case 'T':{ + uint16_t nwname = va_arg(ap, int); + const char **wnames = va_arg(ap, const char **); + + errcode = p9pdu_writef(pdu, proto_version, "w", + nwname); + if (!errcode) { + int i; + + for (i = 0; i < nwname; i++) { + errcode = + p9pdu_writef(pdu, + proto_version, + "s", + wnames[i]); + if (errcode) + break; + } + } + } + break; + case 'R':{ + uint16_t nwqid = va_arg(ap, int); + struct p9_qid *wqids = + va_arg(ap, struct p9_qid *); + + errcode = p9pdu_writef(pdu, proto_version, "w", + nwqid); + if (!errcode) { + int i; + + for (i = 0; i < nwqid; i++) { + errcode = + p9pdu_writef(pdu, + proto_version, + "Q", + &wqids[i]); + if (errcode) + break; + } + } + } + break; + case 'I':{ + struct p9_iattr_dotl *p9attr = va_arg(ap, + struct p9_iattr_dotl *); + + errcode = p9pdu_writef(pdu, proto_version, + "ddugqqqqq", + p9attr->valid, + p9attr->mode, + p9attr->uid, + p9attr->gid, + p9attr->size, + p9attr->atime_sec, + p9attr->atime_nsec, + p9attr->mtime_sec, + p9attr->mtime_nsec); + } + break; + case '?': + if ((proto_version != p9_proto_2000u) && + (proto_version != p9_proto_2000L)) + return 0; + break; + default: + BUG(); + break; + } + + if (errcode) + break; + } + + return errcode; +} + +int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); + va_end(ap); + + return ret; +} + +static int +p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); + va_end(ap); + + return ret; +} + +int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) +{ + struct p9_fcall fake_pdu; + int ret; + + fake_pdu.size = len; + fake_pdu.capacity = len; + fake_pdu.sdata = buf; + fake_pdu.offset = 0; + + ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); + if (ret) { + p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); + trace_9p_protocol_dump(clnt, &fake_pdu); + return ret; + } + + return fake_pdu.offset; +} +EXPORT_SYMBOL(p9stat_read); + +int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) +{ + pdu->id = type; + return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); +} + +int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) +{ + int size = pdu->size; + int err; + + pdu->size = 0; + err = p9pdu_writef(pdu, 0, "d", size); + pdu->size = size; + + trace_9p_protocol_dump(clnt, pdu); + p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", + pdu->size, pdu->id, pdu->tag); + + return err; +} + +void p9pdu_reset(struct p9_fcall *pdu) +{ + pdu->offset = 0; + pdu->size = 0; +} + +int p9dirent_read(struct p9_client *clnt, char *buf, int len, + struct p9_dirent *dirent) +{ + struct p9_fcall fake_pdu; + int ret; + char *nameptr; + + fake_pdu.size = len; + fake_pdu.capacity = len; + fake_pdu.sdata = buf; + fake_pdu.offset = 0; + + ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, + &dirent->d_off, &dirent->d_type, &nameptr); + if (ret) { + p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); + trace_9p_protocol_dump(clnt, &fake_pdu); + return ret; + } + + ret = strscpy(dirent->d_name, nameptr, sizeof(dirent->d_name)); + if (ret < 0) { + p9_debug(P9_DEBUG_ERROR, + "On the wire dirent name too long: %s\n", + nameptr); + kfree(nameptr); + return ret; + } + kfree(nameptr); + + return fake_pdu.offset; +} +EXPORT_SYMBOL(p9dirent_read); -- 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