b605ee421f
Remove afs_cmp_addr_list() as it was never implemented. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
365 lines
7.8 KiB
C
365 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/* Server address list management
|
|
*
|
|
* Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/dns_resolver.h>
|
|
#include <linux/inet.h>
|
|
#include <keys/rxrpc-type.h>
|
|
#include "internal.h"
|
|
#include "afs_fs.h"
|
|
|
|
static void afs_free_addrlist(struct rcu_head *rcu)
|
|
{
|
|
struct afs_addr_list *alist = container_of(rcu, struct afs_addr_list, rcu);
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < alist->nr_addrs; i++)
|
|
rxrpc_kernel_put_peer(alist->addrs[i].peer);
|
|
trace_afs_alist(alist->debug_id, refcount_read(&alist->usage), afs_alist_trace_free);
|
|
kfree(alist);
|
|
}
|
|
|
|
/*
|
|
* Release an address list.
|
|
*/
|
|
void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason)
|
|
{
|
|
unsigned int debug_id;
|
|
bool dead;
|
|
int r;
|
|
|
|
if (!alist)
|
|
return;
|
|
debug_id = alist->debug_id;
|
|
dead = __refcount_dec_and_test(&alist->usage, &r);
|
|
trace_afs_alist(debug_id, r - 1, reason);
|
|
if (dead)
|
|
call_rcu(&alist->rcu, afs_free_addrlist);
|
|
}
|
|
|
|
struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason)
|
|
{
|
|
int r;
|
|
|
|
if (alist) {
|
|
__refcount_inc(&alist->usage, &r);
|
|
trace_afs_alist(alist->debug_id, r + 1, reason);
|
|
}
|
|
return alist;
|
|
}
|
|
|
|
/*
|
|
* Allocate an address list.
|
|
*/
|
|
struct afs_addr_list *afs_alloc_addrlist(unsigned int nr)
|
|
{
|
|
struct afs_addr_list *alist;
|
|
static atomic_t debug_id;
|
|
|
|
_enter("%u", nr);
|
|
|
|
if (nr > AFS_MAX_ADDRESSES)
|
|
nr = AFS_MAX_ADDRESSES;
|
|
|
|
alist = kzalloc(struct_size(alist, addrs, nr), GFP_KERNEL);
|
|
if (!alist)
|
|
return NULL;
|
|
|
|
refcount_set(&alist->usage, 1);
|
|
alist->max_addrs = nr;
|
|
alist->debug_id = atomic_inc_return(&debug_id);
|
|
trace_afs_alist(alist->debug_id, 1, afs_alist_trace_alloc);
|
|
return alist;
|
|
}
|
|
|
|
/*
|
|
* Parse a text string consisting of delimited addresses.
|
|
*/
|
|
struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *net,
|
|
const char *text, size_t len,
|
|
char delim,
|
|
unsigned short service,
|
|
unsigned short port)
|
|
{
|
|
struct afs_vlserver_list *vllist;
|
|
struct afs_addr_list *alist;
|
|
const char *p, *end = text + len;
|
|
const char *problem;
|
|
unsigned int nr = 0;
|
|
int ret = -ENOMEM;
|
|
|
|
_enter("%*.*s,%c", (int)len, (int)len, text, delim);
|
|
|
|
if (!len) {
|
|
_leave(" = -EDESTADDRREQ [empty]");
|
|
return ERR_PTR(-EDESTADDRREQ);
|
|
}
|
|
|
|
if (delim == ':' && (memchr(text, ',', len) || !memchr(text, '.', len)))
|
|
delim = ',';
|
|
|
|
/* Count the addresses */
|
|
p = text;
|
|
do {
|
|
if (!*p) {
|
|
problem = "nul";
|
|
goto inval;
|
|
}
|
|
if (*p == delim)
|
|
continue;
|
|
nr++;
|
|
if (*p == '[') {
|
|
p++;
|
|
if (p == end) {
|
|
problem = "brace1";
|
|
goto inval;
|
|
}
|
|
p = memchr(p, ']', end - p);
|
|
if (!p) {
|
|
problem = "brace2";
|
|
goto inval;
|
|
}
|
|
p++;
|
|
if (p >= end)
|
|
break;
|
|
}
|
|
|
|
p = memchr(p, delim, end - p);
|
|
if (!p)
|
|
break;
|
|
p++;
|
|
} while (p < end);
|
|
|
|
_debug("%u/%u addresses", nr, AFS_MAX_ADDRESSES);
|
|
|
|
vllist = afs_alloc_vlserver_list(1);
|
|
if (!vllist)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
vllist->nr_servers = 1;
|
|
vllist->servers[0].server = afs_alloc_vlserver("<dummy>", 7, AFS_VL_PORT);
|
|
if (!vllist->servers[0].server)
|
|
goto error_vl;
|
|
|
|
alist = afs_alloc_addrlist(nr);
|
|
if (!alist)
|
|
goto error;
|
|
|
|
/* Extract the addresses */
|
|
p = text;
|
|
do {
|
|
const char *q, *stop;
|
|
unsigned int xport = port;
|
|
__be32 x[4];
|
|
int family;
|
|
|
|
if (*p == delim) {
|
|
p++;
|
|
continue;
|
|
}
|
|
|
|
if (*p == '[') {
|
|
p++;
|
|
q = memchr(p, ']', end - p);
|
|
} else {
|
|
for (q = p; q < end; q++)
|
|
if (*q == '+' || *q == delim)
|
|
break;
|
|
}
|
|
|
|
if (in4_pton(p, q - p, (u8 *)&x[0], -1, &stop)) {
|
|
family = AF_INET;
|
|
} else if (in6_pton(p, q - p, (u8 *)x, -1, &stop)) {
|
|
family = AF_INET6;
|
|
} else {
|
|
problem = "family";
|
|
goto bad_address;
|
|
}
|
|
|
|
p = q;
|
|
if (stop != p) {
|
|
problem = "nostop";
|
|
goto bad_address;
|
|
}
|
|
|
|
if (q < end && *q == ']')
|
|
p++;
|
|
|
|
if (p < end) {
|
|
if (*p == '+') {
|
|
/* Port number specification "+1234" */
|
|
xport = 0;
|
|
p++;
|
|
if (p >= end || !isdigit(*p)) {
|
|
problem = "port";
|
|
goto bad_address;
|
|
}
|
|
do {
|
|
xport *= 10;
|
|
xport += *p - '0';
|
|
if (xport > 65535) {
|
|
problem = "pval";
|
|
goto bad_address;
|
|
}
|
|
p++;
|
|
} while (p < end && isdigit(*p));
|
|
} else if (*p == delim) {
|
|
p++;
|
|
} else {
|
|
problem = "weird";
|
|
goto bad_address;
|
|
}
|
|
}
|
|
|
|
if (family == AF_INET)
|
|
ret = afs_merge_fs_addr4(net, alist, x[0], xport);
|
|
else
|
|
ret = afs_merge_fs_addr6(net, alist, x, xport);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
} while (p < end);
|
|
|
|
rcu_assign_pointer(vllist->servers[0].server->addresses, alist);
|
|
_leave(" = [nr %u]", alist->nr_addrs);
|
|
return vllist;
|
|
|
|
inval:
|
|
_leave(" = -EINVAL [%s %zu %*.*s]",
|
|
problem, p - text, (int)len, (int)len, text);
|
|
return ERR_PTR(-EINVAL);
|
|
bad_address:
|
|
_leave(" = -EINVAL [%s %zu %*.*s]",
|
|
problem, p - text, (int)len, (int)len, text);
|
|
ret = -EINVAL;
|
|
error:
|
|
afs_put_addrlist(alist, afs_alist_trace_put_parse_error);
|
|
error_vl:
|
|
afs_put_vlserverlist(net, vllist);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* Perform a DNS query for VL servers and build a up an address list.
|
|
*/
|
|
struct afs_vlserver_list *afs_dns_query(struct afs_cell *cell, time64_t *_expiry)
|
|
{
|
|
struct afs_vlserver_list *vllist;
|
|
char *result = NULL;
|
|
int ret;
|
|
|
|
_enter("%s", cell->name);
|
|
|
|
ret = dns_query(cell->net->net, "afsdb", cell->name, cell->name_len,
|
|
"srv=1", &result, _expiry, true);
|
|
if (ret < 0) {
|
|
_leave(" = %d [dns]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
if (*_expiry == 0)
|
|
*_expiry = ktime_get_real_seconds() + 60;
|
|
|
|
if (ret > 1 && result[0] == 0)
|
|
vllist = afs_extract_vlserver_list(cell, result, ret);
|
|
else
|
|
vllist = afs_parse_text_addrs(cell->net, result, ret, ',',
|
|
VL_SERVICE, AFS_VL_PORT);
|
|
kfree(result);
|
|
if (IS_ERR(vllist) && vllist != ERR_PTR(-ENOMEM))
|
|
pr_err("Failed to parse DNS data %ld\n", PTR_ERR(vllist));
|
|
|
|
return vllist;
|
|
}
|
|
|
|
/*
|
|
* Merge an IPv4 entry into a fileserver address list.
|
|
*/
|
|
int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *alist,
|
|
__be32 xdr, u16 port)
|
|
{
|
|
struct sockaddr_rxrpc srx;
|
|
struct rxrpc_peer *peer;
|
|
int i;
|
|
|
|
if (alist->nr_addrs >= alist->max_addrs)
|
|
return 0;
|
|
|
|
srx.srx_family = AF_RXRPC;
|
|
srx.transport_type = SOCK_DGRAM;
|
|
srx.transport_len = sizeof(srx.transport.sin);
|
|
srx.transport.sin.sin_family = AF_INET;
|
|
srx.transport.sin.sin_port = htons(port);
|
|
srx.transport.sin.sin_addr.s_addr = xdr;
|
|
|
|
peer = rxrpc_kernel_lookup_peer(net->socket, &srx, GFP_KERNEL);
|
|
if (!peer)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < alist->nr_ipv4; i++) {
|
|
if (peer == alist->addrs[i].peer) {
|
|
rxrpc_kernel_put_peer(peer);
|
|
return 0;
|
|
}
|
|
if (peer <= alist->addrs[i].peer)
|
|
break;
|
|
}
|
|
|
|
if (i < alist->nr_addrs)
|
|
memmove(alist->addrs + i + 1,
|
|
alist->addrs + i,
|
|
sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
|
|
|
|
alist->addrs[i].peer = peer;
|
|
alist->nr_ipv4++;
|
|
alist->nr_addrs++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Merge an IPv6 entry into a fileserver address list.
|
|
*/
|
|
int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *alist,
|
|
__be32 *xdr, u16 port)
|
|
{
|
|
struct sockaddr_rxrpc srx;
|
|
struct rxrpc_peer *peer;
|
|
int i;
|
|
|
|
if (alist->nr_addrs >= alist->max_addrs)
|
|
return 0;
|
|
|
|
srx.srx_family = AF_RXRPC;
|
|
srx.transport_type = SOCK_DGRAM;
|
|
srx.transport_len = sizeof(srx.transport.sin6);
|
|
srx.transport.sin6.sin6_family = AF_INET6;
|
|
srx.transport.sin6.sin6_port = htons(port);
|
|
memcpy(&srx.transport.sin6.sin6_addr, xdr, 16);
|
|
|
|
peer = rxrpc_kernel_lookup_peer(net->socket, &srx, GFP_KERNEL);
|
|
if (!peer)
|
|
return -ENOMEM;
|
|
|
|
for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
|
|
if (peer == alist->addrs[i].peer) {
|
|
rxrpc_kernel_put_peer(peer);
|
|
return 0;
|
|
}
|
|
if (peer <= alist->addrs[i].peer)
|
|
break;
|
|
}
|
|
|
|
if (i < alist->nr_addrs)
|
|
memmove(alist->addrs + i + 1,
|
|
alist->addrs + i,
|
|
sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
|
|
alist->addrs[i].peer = peer;
|
|
alist->nr_addrs++;
|
|
return 0;
|
|
}
|