afs: Provide a way to configure address priorities
AFS servers may have multiple addresses, but the client can't easily judge between them as to which one is best. For instance, an address that has a larger RTT might actually have a better bandwidth because it goes through a switch rather than being directly connected - but we can't work this out dynamically unless we push through sufficient data that we can measure it. To allow the administrator to configure this, add a list of preference weightings for server addresses by IPv4/IPv6 address or subnet and allow this to be viewed through a procfile and altered by writing text commands to that same file. Preference rules can be added/updated by: echo "add <proto> <addr>[/<subnet>] <prior>" >/proc/fs/afs/addr_prefs echo "add udp 1.2.3.4 1000" >/proc/fs/afs/addr_prefs echo "add udp 192.168.0.0/16 3000" >/proc/fs/afs/addr_prefs echo "add udp 1001:2002:0:6::/64 4000" >/proc/fs/afs/addr_prefs and removed by: echo "del <proto> <addr>[/<subnet>]" >/proc/fs/afs/addr_prefs echo "del udp 1.2.3.4" >/proc/fs/afs/addr_prefs where the priority is a number between 0 and 65535. The list is split between IPv4 and IPv6 addresses and each sublist is kept in numerical order, with rules that would otherwise match but have different subnet masking being ordered with the most specific submatch first. A subsequent patch will apply these rules. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
This commit is contained in:
David Howells
parent
b605ee421f
commit
f94f70d39c
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@ -5,6 +5,7 @@
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kafs-y := \
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addr_list.o \
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addr_prefs.o \
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callback.o \
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cell.o \
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cmservice.o \
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@ -0,0 +1,449 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* Address preferences management
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*
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* Copyright (C) 2023 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": addr_prefs: " fmt
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#include <linux/inet.h>
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#include <linux/seq_file.h>
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#include <keys/rxrpc-type.h>
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#include "internal.h"
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static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
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{
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return afs_net(seq_file_single_net(m));
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}
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/*
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* Split a NUL-terminated string up to the first newline around spaces. The
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* source string will be modified to have NUL-terminations inserted.
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*/
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static int afs_split_string(char **pbuf, char *strv[], unsigned int maxstrv)
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{
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unsigned int count = 0;
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char *p = *pbuf;
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maxstrv--; /* Allow for terminal NULL */
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for (;;) {
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/* Skip over spaces */
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while (isspace(*p)) {
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if (*p == '\n') {
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p++;
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break;
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}
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p++;
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}
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if (!*p)
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break;
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/* Mark start of word */
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if (count >= maxstrv) {
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pr_warn("Too many elements in string\n");
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return -EINVAL;
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}
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strv[count++] = p;
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/* Skip over word */
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while (!isspace(*p))
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p++;
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if (!*p)
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break;
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/* Mark end of word */
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if (*p == '\n') {
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*p++ = 0;
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break;
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}
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*p++ = 0;
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}
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*pbuf = p;
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strv[count] = NULL;
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return count;
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}
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/*
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* Parse an address with an optional subnet mask.
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*/
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static int afs_parse_address(char *p, struct afs_addr_preference *pref)
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{
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const char *stop;
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unsigned long mask, tmp;
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char *end = p + strlen(p);
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bool bracket = false;
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if (*p == '[') {
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p++;
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bracket = true;
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}
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#if 0
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if (*p == '[') {
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p++;
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q = memchr(p, ']', end - p);
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if (!q) {
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pr_warn("Can't find closing ']'\n");
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return -EINVAL;
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}
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} else {
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for (q = p; q < end; q++)
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if (*q == '/')
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break;
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}
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#endif
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if (in4_pton(p, end - p, (u8 *)&pref->ipv4_addr, -1, &stop)) {
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pref->family = AF_INET;
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mask = 32;
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} else if (in6_pton(p, end - p, (u8 *)&pref->ipv6_addr, -1, &stop)) {
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pref->family = AF_INET6;
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mask = 128;
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} else {
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pr_warn("Can't determine address family\n");
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return -EINVAL;
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}
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p = (char *)stop;
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if (bracket) {
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if (*p != ']') {
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pr_warn("Can't find closing ']'\n");
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return -EINVAL;
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}
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p++;
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}
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if (*p == '/') {
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p++;
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tmp = simple_strtoul(p, &p, 10);
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if (tmp > mask) {
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pr_warn("Subnet mask too large\n");
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return -EINVAL;
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}
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if (tmp == 0) {
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pr_warn("Subnet mask too small\n");
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return -EINVAL;
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}
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mask = tmp;
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}
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if (*p) {
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pr_warn("Invalid address\n");
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return -EINVAL;
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}
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pref->subnet_mask = mask;
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return 0;
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}
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enum cmp_ret {
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CONTINUE_SEARCH,
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INSERT_HERE,
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EXACT_MATCH,
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SUBNET_MATCH,
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};
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/*
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* See if a candidate address matches a listed address.
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*/
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static enum cmp_ret afs_cmp_address_pref(const struct afs_addr_preference *a,
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const struct afs_addr_preference *b)
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{
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int subnet = min(a->subnet_mask, b->subnet_mask);
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const __be32 *pa, *pb;
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u32 mask, na, nb;
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int diff;
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if (a->family != b->family)
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return INSERT_HERE;
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switch (a->family) {
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case AF_INET6:
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pa = a->ipv6_addr.s6_addr32;
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pb = b->ipv6_addr.s6_addr32;
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break;
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case AF_INET:
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pa = &a->ipv4_addr.s_addr;
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pb = &b->ipv4_addr.s_addr;
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break;
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}
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while (subnet > 32) {
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diff = ntohl(*pa++) - ntohl(*pb++);
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if (diff < 0)
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return INSERT_HERE; /* a<b */
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if (diff > 0)
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return CONTINUE_SEARCH; /* a>b */
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subnet -= 32;
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}
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if (subnet == 0)
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return EXACT_MATCH;
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mask = 0xffffffffU << (32 - subnet);
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na = ntohl(*pa);
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nb = ntohl(*pb);
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diff = (na & mask) - (nb & mask);
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//kdebug("diff %08x %08x %08x %d", na, nb, mask, diff);
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if (diff < 0)
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return INSERT_HERE; /* a<b */
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if (diff > 0)
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return CONTINUE_SEARCH; /* a>b */
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if (a->subnet_mask == b->subnet_mask)
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return EXACT_MATCH;
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if (a->subnet_mask > b->subnet_mask)
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return SUBNET_MATCH; /* a binds tighter than b */
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return CONTINUE_SEARCH; /* b binds tighter than a */
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}
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/*
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* Insert an address preference.
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*/
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static int afs_insert_address_pref(struct afs_addr_preference_list **_preflist,
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struct afs_addr_preference *pref,
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int index)
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{
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struct afs_addr_preference_list *preflist = *_preflist, *old = preflist;
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size_t size, max_prefs;
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_enter("{%u/%u/%u},%u", preflist->ipv6_off, preflist->nr, preflist->max_prefs, index);
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if (preflist->nr == 255)
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return -ENOSPC;
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if (preflist->nr >= preflist->max_prefs) {
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max_prefs = preflist->max_prefs + 1;
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size = struct_size(preflist, prefs, max_prefs);
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size = roundup_pow_of_two(size);
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max_prefs = min_t(size_t, (size - sizeof(*preflist)) / sizeof(*pref), 255);
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preflist = kmalloc(size, GFP_KERNEL);
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if (!preflist)
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return -ENOMEM;
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*preflist = **_preflist;
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preflist->max_prefs = max_prefs;
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*_preflist = preflist;
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if (index < preflist->nr)
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memcpy(preflist->prefs + index + 1, old->prefs + index,
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sizeof(*pref) * (preflist->nr - index));
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if (index > 0)
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memcpy(preflist->prefs, old->prefs, sizeof(*pref) * index);
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} else {
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if (index < preflist->nr)
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memmove(preflist->prefs + index + 1, preflist->prefs + index,
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sizeof(*pref) * (preflist->nr - index));
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}
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preflist->prefs[index] = *pref;
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preflist->nr++;
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if (pref->family == AF_INET)
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preflist->ipv6_off++;
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return 0;
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}
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/*
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* Add an address preference.
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* echo "add <proto> <IP>[/<mask>] <prior>" >/proc/fs/afs/addr_prefs
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*/
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static int afs_add_address_pref(struct afs_net *net, struct afs_addr_preference_list **_preflist,
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int argc, char **argv)
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{
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struct afs_addr_preference_list *preflist = *_preflist;
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struct afs_addr_preference pref;
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enum cmp_ret cmp;
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int ret, i, stop;
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if (argc != 3) {
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pr_warn("Wrong number of params\n");
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return -EINVAL;
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}
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if (strcmp(argv[0], "udp") != 0) {
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pr_warn("Unsupported protocol\n");
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return -EINVAL;
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}
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ret = afs_parse_address(argv[1], &pref);
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if (ret < 0)
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return ret;
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ret = kstrtou16(argv[2], 10, &pref.prio);
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if (ret < 0) {
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pr_warn("Invalid priority\n");
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return ret;
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}
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if (pref.family == AF_INET) {
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i = 0;
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stop = preflist->ipv6_off;
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} else {
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i = preflist->ipv6_off;
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stop = preflist->nr;
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}
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for (; i < stop; i++) {
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cmp = afs_cmp_address_pref(&pref, &preflist->prefs[i]);
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switch (cmp) {
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case CONTINUE_SEARCH:
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continue;
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case INSERT_HERE:
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case SUBNET_MATCH:
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return afs_insert_address_pref(_preflist, &pref, i);
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case EXACT_MATCH:
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preflist->prefs[i].prio = pref.prio;
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return 0;
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}
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}
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return afs_insert_address_pref(_preflist, &pref, i);
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}
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/*
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* Delete an address preference.
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*/
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static int afs_delete_address_pref(struct afs_addr_preference_list **_preflist,
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int index)
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{
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struct afs_addr_preference_list *preflist = *_preflist;
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_enter("{%u/%u/%u},%u", preflist->ipv6_off, preflist->nr, preflist->max_prefs, index);
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if (preflist->nr == 0)
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return -ENOENT;
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if (index < preflist->nr - 1)
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memmove(preflist->prefs + index, preflist->prefs + index + 1,
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sizeof(preflist->prefs[0]) * (preflist->nr - index - 1));
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if (index < preflist->ipv6_off)
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preflist->ipv6_off--;
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preflist->nr--;
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return 0;
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}
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/*
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* Delete an address preference.
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* echo "del <proto> <IP>[/<mask>]" >/proc/fs/afs/addr_prefs
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*/
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static int afs_del_address_pref(struct afs_net *net, struct afs_addr_preference_list **_preflist,
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int argc, char **argv)
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{
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struct afs_addr_preference_list *preflist = *_preflist;
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struct afs_addr_preference pref;
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enum cmp_ret cmp;
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int ret, i, stop;
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if (argc != 2) {
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pr_warn("Wrong number of params\n");
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return -EINVAL;
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}
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if (strcmp(argv[0], "udp") != 0) {
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pr_warn("Unsupported protocol\n");
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return -EINVAL;
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}
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ret = afs_parse_address(argv[1], &pref);
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if (ret < 0)
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return ret;
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if (pref.family == AF_INET) {
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i = 0;
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stop = preflist->ipv6_off;
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} else {
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i = preflist->ipv6_off;
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stop = preflist->nr;
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}
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for (; i < stop; i++) {
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cmp = afs_cmp_address_pref(&pref, &preflist->prefs[i]);
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switch (cmp) {
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case CONTINUE_SEARCH:
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continue;
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case INSERT_HERE:
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case SUBNET_MATCH:
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return 0;
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case EXACT_MATCH:
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return afs_delete_address_pref(_preflist, i);
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}
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}
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return -ENOANO;
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}
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/*
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* Handle writes to /proc/fs/afs/addr_prefs
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*/
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int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size)
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{
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struct afs_addr_preference_list *preflist, *old;
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struct seq_file *m = file->private_data;
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struct afs_net *net = afs_seq2net_single(m);
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size_t psize;
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char *argv[5];
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int ret, argc, max_prefs;
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inode_lock(file_inode(file));
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/* Allocate a candidate new list and initialise it from the old. */
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old = rcu_dereference_protected(net->address_prefs,
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lockdep_is_held(&file_inode(file)->i_rwsem));
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if (old)
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max_prefs = old->nr + 1;
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else
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max_prefs = 1;
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psize = struct_size(old, prefs, max_prefs);
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psize = roundup_pow_of_two(psize);
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max_prefs = min_t(size_t, (psize - sizeof(*old)) / sizeof(old->prefs[0]), 255);
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ret = -ENOMEM;
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preflist = kmalloc(struct_size(preflist, prefs, max_prefs), GFP_KERNEL);
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if (!preflist)
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goto done;
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if (old)
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memcpy(preflist, old, struct_size(preflist, prefs, old->nr));
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else
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memset(preflist, 0, sizeof(*preflist));
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preflist->max_prefs = max_prefs;
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do {
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argc = afs_split_string(&buf, argv, ARRAY_SIZE(argv));
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if (argc < 0)
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return argc;
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if (argc < 2)
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goto inval;
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if (strcmp(argv[0], "add") == 0)
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ret = afs_add_address_pref(net, &preflist, argc - 1, argv + 1);
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else if (strcmp(argv[0], "del") == 0)
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ret = afs_del_address_pref(net, &preflist, argc - 1, argv + 1);
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else
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goto inval;
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if (ret < 0)
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goto done;
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} while (*buf);
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preflist->version++;
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rcu_assign_pointer(net->address_prefs, preflist);
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/* Store prefs before version */
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smp_store_release(&net->address_pref_version, preflist->version);
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kfree_rcu(old, rcu);
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preflist = NULL;
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ret = 0;
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done:
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kfree(preflist);
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inode_unlock(file_inode(file));
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_leave(" = %d", ret);
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return ret;
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inval:
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pr_warn("Invalid Command\n");
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ret = -EINVAL;
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goto done;
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}
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|
|
@ -72,6 +72,28 @@ enum afs_call_state {
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AFS_CALL_COMPLETE, /* Completed or failed */
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};
|
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|
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/*
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* Address preferences.
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||||
*/
|
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struct afs_addr_preference {
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union {
|
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struct in_addr ipv4_addr; /* AF_INET address to compare against */
|
||||
struct in6_addr ipv6_addr; /* AF_INET6 address to compare against */
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||||
};
|
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sa_family_t family; /* Which address to use */
|
||||
u16 prio; /* Priority */
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u8 subnet_mask; /* How many bits to compare */
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};
|
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|
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struct afs_addr_preference_list {
|
||||
struct rcu_head rcu;
|
||||
u16 version; /* Incremented when prefs list changes */
|
||||
u8 ipv6_off; /* Offset of IPv6 addresses */
|
||||
u8 nr; /* Number of addresses in total */
|
||||
u8 max_prefs; /* Number of prefs allocated */
|
||||
struct afs_addr_preference prefs[] __counted_by(max_prefs);
|
||||
};
|
||||
|
||||
struct afs_address {
|
||||
struct rxrpc_peer *peer;
|
||||
short last_error; /* Last error from this address */
|
||||
|
|
@ -315,6 +337,8 @@ struct afs_net {
|
|||
struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
|
||||
struct afs_sysnames *sysnames;
|
||||
rwlock_t sysnames_lock;
|
||||
struct afs_addr_preference_list __rcu *address_prefs;
|
||||
u16 address_pref_version;
|
||||
|
||||
/* Statistics counters */
|
||||
atomic_t n_lookup; /* Number of lookups done */
|
||||
|
|
@ -982,6 +1006,11 @@ extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
|
|||
extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
|
||||
__be32 *xdr, u16 port);
|
||||
|
||||
/*
|
||||
* addr_prefs.c
|
||||
*/
|
||||
int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
|
||||
|
||||
/*
|
||||
* callback.c
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -156,6 +156,7 @@ static void __net_exit afs_net_exit(struct net *net_ns)
|
|||
afs_close_socket(net);
|
||||
afs_proc_cleanup(net);
|
||||
afs_put_sysnames(net->sysnames);
|
||||
kfree_rcu(rcu_access_pointer(net->address_prefs), rcu);
|
||||
}
|
||||
|
||||
static struct pernet_operations afs_net_ops = {
|
||||
|
|
|
|||
|
|
@ -146,6 +146,55 @@ inval:
|
|||
goto done;
|
||||
}
|
||||
|
||||
/*
|
||||
* Display the list of addr_prefs known to the namespace.
|
||||
*/
|
||||
static int afs_proc_addr_prefs_show(struct seq_file *m, void *v)
|
||||
{
|
||||
struct afs_addr_preference_list *preflist;
|
||||
struct afs_addr_preference *pref;
|
||||
struct afs_net *net = afs_seq2net_single(m);
|
||||
union {
|
||||
struct sockaddr_in sin;
|
||||
struct sockaddr_in6 sin6;
|
||||
} addr;
|
||||
unsigned int i;
|
||||
char buf[44]; /* Maximum ipv6 + max subnet is 43 */
|
||||
|
||||
rcu_read_lock();
|
||||
preflist = rcu_dereference(net->address_prefs);
|
||||
|
||||
if (!preflist) {
|
||||
seq_puts(m, "NO PREFS\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
seq_printf(m, "PROT SUBNET PRIOR (v=%u n=%u/%u/%u)\n",
|
||||
preflist->version, preflist->ipv6_off, preflist->nr, preflist->max_prefs);
|
||||
|
||||
memset(&addr, 0, sizeof(addr));
|
||||
|
||||
for (i = 0; i < preflist->nr; i++) {
|
||||
pref = &preflist->prefs[i];
|
||||
|
||||
addr.sin.sin_family = pref->family;
|
||||
if (pref->family == AF_INET) {
|
||||
memcpy(&addr.sin.sin_addr, &pref->ipv4_addr,
|
||||
sizeof(addr.sin.sin_addr));
|
||||
snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin, pref->subnet_mask);
|
||||
seq_printf(m, "UDP %-43.43s %5u\n", buf, pref->prio);
|
||||
} else {
|
||||
memcpy(&addr.sin6.sin6_addr, &pref->ipv6_addr,
|
||||
sizeof(addr.sin6.sin6_addr));
|
||||
snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin6, pref->subnet_mask);
|
||||
seq_printf(m, "UDP %-43.43s %5u\n", buf, pref->prio);
|
||||
}
|
||||
}
|
||||
|
||||
rcu_read_lock();
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Display the name of the current workstation cell.
|
||||
*/
|
||||
|
|
@ -690,7 +739,11 @@ int afs_proc_init(struct afs_net *net)
|
|||
&afs_proc_sysname_ops,
|
||||
afs_proc_sysname_write,
|
||||
sizeof(struct seq_net_private),
|
||||
NULL))
|
||||
NULL) ||
|
||||
!proc_create_net_single_write("addr_prefs", 0644, p,
|
||||
afs_proc_addr_prefs_show,
|
||||
afs_proc_addr_prefs_write,
|
||||
NULL))
|
||||
goto error_tree;
|
||||
|
||||
net->proc_afs = p;
|
||||
|
|
|
|||
Loading…
Reference in New Issue