^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/nfs/nfs4namespace.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2005 Trond Myklebust <Trond.Myklebust@netapp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * - Modified by David Howells <dhowells@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * NFSv4 namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/nfs_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/nfs_mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/sunrpc/clnt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/sunrpc/addr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "nfs4_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "nfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "dns_resolve.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define NFSDBG_FACILITY NFSDBG_VFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Work out the length that an NFSv4 path would render to as a standard posix
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * path, with a leading slash but no terminating slash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static ssize_t nfs4_pathname_len(const struct nfs4_pathname *pathname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) ssize_t len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) for (i = 0; i < pathname->ncomponents; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) const struct nfs4_string *component = &pathname->components[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (component->len > NAME_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) goto too_long;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) len += 1 + component->len; /* Adding "/foo" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (len > PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) goto too_long;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) too_long:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Convert the NFSv4 pathname components into a standard posix path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) unsigned short *_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) char *buf, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) len = nfs4_pathname_len(pathname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return ERR_PTR(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) *_len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) p = buf = kmalloc(len + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) for (i = 0; i < pathname->ncomponents; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) const struct nfs4_string *component = &pathname->components[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) *p++ = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) memcpy(p, component->data, component->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) p += component->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * return the path component of "<server>:<path>"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * nfspath - the "<server>:<path>" string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * end - one past the last char that could contain "<server>:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * returns NULL on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static char *nfs_path_component(const char *nfspath, const char *end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (*nfspath == '[') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /* parse [] escaped IPv6 addrs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) p = strchr(nfspath, ']');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (p != NULL && ++p < end && *p == ':')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return p + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* otherwise split on first colon */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) p = strchr(nfspath, ':');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (p != NULL && p < end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return p + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * Determine the mount path as a string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) char *limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) char *path = nfs_path(&limit, dentry, buffer, buflen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) NFS_PATH_CANONICAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (!IS_ERR(path)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) char *path_component = nfs_path_component(path, limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (path_component)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return path_component;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * Check that fs_locations::fs_root [RFC3530 6.3] is a prefix for what we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * believe to be the server path to this dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static int nfs4_validate_fspath(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) const struct nfs4_fs_locations *locations,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct nfs_fs_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) const char *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) char *fs_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unsigned short len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) buf = kmalloc(4096, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) path = nfs4_path(dentry, buf, 4096);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (IS_ERR(path)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return PTR_ERR(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) fs_path = nfs4_pathname_string(&locations->fs_path, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (IS_ERR(fs_path)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return PTR_ERR(fs_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) n = strncmp(path, fs_path, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) kfree(fs_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (n != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) dprintk("%s: path %s does not begin with fsroot %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) __func__, path, ctx->nfs_server.export_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr *sa,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) size_t salen, struct net *net, int port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) ret = rpc_pton(net, string, len, sa, salen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ret = rpc_uaddr2sockaddr(net, string, len, sa, salen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) ret = nfs_dns_resolve_name(net, string, len, sa, salen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) } else if (port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) rpc_set_port(sa, port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * nfs_find_best_sec - Find a security mechanism supported locally
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * @clnt: pointer to rpc_clnt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * @server: NFS server struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * @flavors: List of security tuples returned by SECINFO procedure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * Return an rpc client that uses the first security mechanism in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * "flavors" that is locally supported. The "flavors" array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * is searched in the order returned from the server, per RFC 3530
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * recommendation and each flavor is checked for membership in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * sec= mount option list if it exists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * Return -EPERM if no matching flavor is found in the array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * Please call rpc_shutdown_client() when you are done with this rpc client.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static struct rpc_clnt *nfs_find_best_sec(struct rpc_clnt *clnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct nfs_server *server,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct nfs4_secinfo_flavors *flavors)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) rpc_authflavor_t pflavor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct nfs4_secinfo4 *secinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) for (i = 0; i < flavors->num_flavors; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) secinfo = &flavors->flavors[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) switch (secinfo->flavor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) case RPC_AUTH_NULL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) case RPC_AUTH_UNIX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) case RPC_AUTH_GSS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) pflavor = rpcauth_get_pseudoflavor(secinfo->flavor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) &secinfo->flavor_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* does the pseudoflavor match a sec= mount opt? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (pflavor != RPC_AUTH_MAXFLAVOR &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) nfs_auth_info_match(&server->auth_info, pflavor)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct rpc_clnt *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct rpc_cred *cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* Cloning creates an rpc_auth for the flavor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) new = rpc_clone_client_set_auth(clnt, pflavor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (IS_ERR(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * Check that the user actually can use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * flavor. This is mostly for RPC_AUTH_GSS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * where cr_init obtains a gss context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) cred = rpcauth_lookupcred(new->cl_auth, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (IS_ERR(cred)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) rpc_shutdown_client(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) put_rpccred(cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return ERR_PTR(-EPERM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * nfs4_negotiate_security - in response to an NFS4ERR_WRONGSEC on lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * return an rpc_clnt that uses the best available security flavor with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * respect to the secinfo flavor list and the sec= mount options.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * @clnt: RPC client to clone
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * @inode: directory inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * @name: lookup name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * Please call rpc_shutdown_client() when you are done with this rpc client.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) struct rpc_clnt *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) nfs4_negotiate_security(struct rpc_clnt *clnt, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) const struct qstr *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct nfs4_secinfo_flavors *flavors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct rpc_clnt *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) page = alloc_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) flavors = page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) err = nfs4_proc_secinfo(inode, name, flavors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) new = ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) new = nfs_find_best_sec(clnt, NFS_SERVER(inode), flavors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static int try_location(struct fs_context *fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) const struct nfs4_fs_location *location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct nfs_fs_context *ctx = nfs_fc2context(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) unsigned int len, s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) char *export_path, *source, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) int ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /* Allocate a buffer big enough to hold any of the hostnames plus a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * terminating char and also a buffer big enough to hold the hostname
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * plus a colon plus the path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) for (s = 0; s < location->nservers; s++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) const struct nfs4_string *buf = &location->servers[s];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (buf->len > len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) len = buf->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) kfree(ctx->nfs_server.hostname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) ctx->nfs_server.hostname = kmalloc(len + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!ctx->nfs_server.hostname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) export_path = nfs4_pathname_string(&location->rootpath,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) &ctx->nfs_server.export_path_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (IS_ERR(export_path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return PTR_ERR(export_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) kfree(ctx->nfs_server.export_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) ctx->nfs_server.export_path = export_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) source = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (!source)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) kfree(fc->source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) fc->source = source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) for (s = 0; s < location->nservers; s++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) const struct nfs4_string *buf = &location->servers[s];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) ctx->nfs_server.addrlen =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) nfs_parse_server_name(buf->data, buf->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) &ctx->nfs_server.address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) sizeof(ctx->nfs_server._address),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) fc->net_ns, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (ctx->nfs_server.addrlen == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) memcpy(ctx->nfs_server.hostname, buf->data, buf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) ctx->nfs_server.hostname[buf->len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) p = source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) memcpy(p, buf->data, buf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) p += buf->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) *p++ = ':';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) memcpy(p, ctx->nfs_server.export_path, ctx->nfs_server.export_path_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) p += ctx->nfs_server.export_path_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) *p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) ret = nfs4_get_referral_tree(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * nfs_follow_referral - set up mountpoint when hitting a referral on moved error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * @fc: pointer to struct nfs_fs_context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * @locations: array of NFSv4 server location information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static int nfs_follow_referral(struct fs_context *fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) const struct nfs4_fs_locations *locations)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct nfs_fs_context *ctx = nfs_fc2context(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) int loc, error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (locations == NULL || locations->nlocations <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) dprintk("%s: referral at %pd2\n", __func__, ctx->clone_data.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) /* Ensure fs path is a prefix of current dentry path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) error = nfs4_validate_fspath(ctx->clone_data.dentry, locations, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) for (loc = 0; loc < locations->nlocations; loc++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) const struct nfs4_fs_location *location = &locations->locations[loc];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) if (location == NULL || location->nservers <= 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) location->rootpath.ncomponents == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) error = try_location(fc, location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (error == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * nfs_do_refmount - handle crossing a referral on server
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * @dentry - dentry of referral
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static int nfs_do_refmount(struct fs_context *fc, struct rpc_clnt *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct nfs_fs_context *ctx = nfs_fc2context(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct dentry *dentry, *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct nfs4_fs_locations *fs_locations = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) /* BUG_ON(IS_ROOT(dentry)); */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) page = alloc_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) fs_locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) if (!fs_locations)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) /* Get locations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) dentry = ctx->clone_data.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) parent = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) dprintk("%s: getting locations for %pd2\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) __func__, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) err = nfs4_proc_fs_locations(client, d_inode(parent), &dentry->d_name, fs_locations, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) dput(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (err != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) goto out_free_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (fs_locations->nlocations <= 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) fs_locations->fs_path.ncomponents <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) goto out_free_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) err = nfs_follow_referral(fc, fs_locations);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) out_free_2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) kfree(fs_locations);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) __free_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) int nfs4_submount(struct fs_context *fc, struct nfs_server *server)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct nfs_fs_context *ctx = nfs_fc2context(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct dentry *dentry = ctx->clone_data.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) struct dentry *parent = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) struct inode *dir = d_inode(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct rpc_clnt *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) /* Look it up again to get its attributes and sec flavor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) client = nfs4_proc_lookup_mountpoint(dir, dentry, ctx->mntfh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) ctx->clone_data.fattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) dput(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (IS_ERR(client))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return PTR_ERR(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) ctx->selected_flavor = client->cl_auth->au_flavor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (ctx->clone_data.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) ret = nfs_do_refmount(fc, client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) ret = nfs_do_submount(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) rpc_shutdown_client(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * Try one location from the fs_locations array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * Returns zero on success, or a negative errno value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static int nfs4_try_replacing_one_location(struct nfs_server *server,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) char *page, char *page2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) const struct nfs4_fs_location *location)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) const size_t addr_bufsize = sizeof(struct sockaddr_storage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) struct net *net = rpc_net_ns(server->client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) struct sockaddr *sap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) unsigned int s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) size_t salen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) sap = kmalloc(addr_bufsize, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (sap == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) for (s = 0; s < location->nservers; s++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) const struct nfs4_string *buf = &location->servers[s];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) char *hostname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (buf->len <= 0 || buf->len > PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len) != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) salen = nfs_parse_server_name(buf->data, buf->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) sap, addr_bufsize, net, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (salen == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) rpc_set_port(sap, NFS_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) hostname = kmemdup_nul(buf->data, buf->len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (hostname == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) error = nfs4_update_server(server, hostname, sap, salen, net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) kfree(hostname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (error == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) kfree(sap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) * nfs4_replace_transport - set up transport to destination server
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * @server: export being migrated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * @locations: fs_locations array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * Returns zero on success, or a negative errno value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * The client tries all the entries in the "locations" array, in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) * order returned by the server, until one works or the end of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) * array is reached.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) int nfs4_replace_transport(struct nfs_server *server,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) const struct nfs4_fs_locations *locations)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) char *page = NULL, *page2 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) int loc, error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (locations == NULL || locations->nlocations <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) page = (char *) __get_free_page(GFP_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) page2 = (char *) __get_free_page(GFP_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (!page2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) for (loc = 0; loc < locations->nlocations; loc++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) const struct nfs4_fs_location *location =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) &locations->locations[loc];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) if (location == NULL || location->nservers <= 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) location->rootpath.ncomponents == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) error = nfs4_try_replacing_one_location(server, page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) page2, location);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (error == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) free_page((unsigned long)page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) free_page((unsigned long)page2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags
| Donate