Contributors: 37
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| David L Stevens |
957 |
35.90% |
1 |
0.87% |
| Hideaki Yoshifuji / 吉藤英明 |
485 |
18.19% |
12 |
10.43% |
| Jeff Barnhill |
343 |
12.87% |
2 |
1.74% |
| Linus Torvalds (pre-git) |
256 |
9.60% |
32 |
27.83% |
| Eric Dumazet |
131 |
4.91% |
9 |
7.83% |
| Américo Wang |
114 |
4.28% |
6 |
5.22% |
| Sabrina Dubroca |
68 |
2.55% |
2 |
1.74% |
| David Ahern |
51 |
1.91% |
8 |
6.96% |
| Daniel Lezcano |
41 |
1.54% |
3 |
2.61% |
| David S. Miller |
40 |
1.50% |
4 |
3.48% |
| François-Xavier Le Bail |
25 |
0.94% |
1 |
0.87% |
| Alexey Kuznetsov |
23 |
0.86% |
1 |
0.87% |
| Benjamin Thery |
21 |
0.79% |
1 |
0.87% |
| Pavel Emelyanov |
20 |
0.75% |
2 |
1.74% |
| Eric W. Biedermann |
14 |
0.53% |
3 |
2.61% |
| Shirley Ma |
11 |
0.41% |
1 |
0.87% |
| Gao Feng |
9 |
0.34% |
2 |
1.74% |
| Alexey Dobriyan |
6 |
0.23% |
2 |
1.74% |
| Ian Morris |
5 |
0.19% |
1 |
0.87% |
| Adrian Bunk |
5 |
0.19% |
1 |
0.87% |
| Roopa Prabhu |
4 |
0.15% |
1 |
0.87% |
| Al Viro |
4 |
0.15% |
1 |
0.87% |
| Marcelo Ricardo Leitner |
4 |
0.15% |
1 |
0.87% |
| Thomas Gleixner |
4 |
0.15% |
2 |
1.74% |
| Jean Tourrilhes |
3 |
0.11% |
1 |
0.87% |
| Elena Reshetova |
3 |
0.11% |
1 |
0.87% |
| Linus Torvalds |
3 |
0.11% |
2 |
1.74% |
| Randy Dunlap |
3 |
0.11% |
1 |
0.87% |
| Stephen Hemminger |
2 |
0.08% |
2 |
1.74% |
| Hangbin Liu |
2 |
0.08% |
1 |
0.87% |
| Harvey Harrison |
2 |
0.08% |
2 |
1.74% |
| Ville Nuorvala |
2 |
0.08% |
1 |
0.87% |
| Li RongQing |
1 |
0.04% |
1 |
0.87% |
| Andrew Morton |
1 |
0.04% |
1 |
0.87% |
| Joe Perches |
1 |
0.04% |
1 |
0.87% |
| Christoph Hellwig |
1 |
0.04% |
1 |
0.87% |
| Philippe De Muyter |
1 |
0.04% |
1 |
0.87% |
| Total |
2666 |
|
115 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Anycast support for IPv6
* Linux INET6 implementation
*
* Authors:
* David L Stevens (dlstevens@us.ibm.com)
*
* based heavily on net/ipv6/mcast.c
*/
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/random.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/route.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/if_inet6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/checksum.h>
#define IN6_ADDR_HSIZE_SHIFT 8
#define IN6_ADDR_HSIZE BIT(IN6_ADDR_HSIZE_SHIFT)
/* anycast address hash table
*/
static struct hlist_head inet6_acaddr_lst[IN6_ADDR_HSIZE];
static DEFINE_SPINLOCK(acaddr_hash_lock);
static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
static u32 inet6_acaddr_hash(struct net *net, const struct in6_addr *addr)
{
u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
}
/*
* socket join an anycast group
*/
int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct net_device *dev = NULL;
struct inet6_dev *idev;
struct ipv6_ac_socklist *pac;
struct net *net = sock_net(sk);
int ishost = !net->ipv6.devconf_all->forwarding;
int err = 0;
ASSERT_RTNL();
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (ipv6_addr_is_multicast(addr))
return -EINVAL;
if (ifindex)
dev = __dev_get_by_index(net, ifindex);
if (ipv6_chk_addr_and_flags(net, addr, dev, true, 0, IFA_F_TENTATIVE))
return -EINVAL;
pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
if (!pac)
return -ENOMEM;
pac->acl_next = NULL;
pac->acl_addr = *addr;
if (ifindex == 0) {
struct rt6_info *rt;
rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
if (rt) {
dev = rt->dst.dev;
ip6_rt_put(rt);
} else if (ishost) {
err = -EADDRNOTAVAIL;
goto error;
} else {
/* router, no matching interface: just pick one */
dev = __dev_get_by_flags(net, IFF_UP,
IFF_UP | IFF_LOOPBACK);
}
}
if (!dev) {
err = -ENODEV;
goto error;
}
idev = __in6_dev_get(dev);
if (!idev) {
if (ifindex)
err = -ENODEV;
else
err = -EADDRNOTAVAIL;
goto error;
}
/* reset ishost, now that we have a specific device */
ishost = !idev->cnf.forwarding;
pac->acl_ifindex = dev->ifindex;
/* XXX
* For hosts, allow link-local or matching prefix anycasts.
* This obviates the need for propagating anycast routes while
* still allowing some non-router anycast participation.
*/
if (!ipv6_chk_prefix(addr, dev)) {
if (ishost)
err = -EADDRNOTAVAIL;
if (err)
goto error;
}
err = __ipv6_dev_ac_inc(idev, addr);
if (!err) {
pac->acl_next = np->ipv6_ac_list;
np->ipv6_ac_list = pac;
pac = NULL;
}
error:
if (pac)
sock_kfree_s(sk, pac, sizeof(*pac));
return err;
}
/*
* socket leave an anycast group
*/
int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct net_device *dev;
struct ipv6_ac_socklist *pac, *prev_pac;
struct net *net = sock_net(sk);
ASSERT_RTNL();
prev_pac = NULL;
for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
ipv6_addr_equal(&pac->acl_addr, addr))
break;
prev_pac = pac;
}
if (!pac)
return -ENOENT;
if (prev_pac)
prev_pac->acl_next = pac->acl_next;
else
np->ipv6_ac_list = pac->acl_next;
dev = __dev_get_by_index(net, pac->acl_ifindex);
if (dev)
ipv6_dev_ac_dec(dev, &pac->acl_addr);
sock_kfree_s(sk, pac, sizeof(*pac));
return 0;
}
void __ipv6_sock_ac_close(struct sock *sk)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct net_device *dev = NULL;
struct ipv6_ac_socklist *pac;
struct net *net = sock_net(sk);
int prev_index;
ASSERT_RTNL();
pac = np->ipv6_ac_list;
np->ipv6_ac_list = NULL;
prev_index = 0;
while (pac) {
struct ipv6_ac_socklist *next = pac->acl_next;
if (pac->acl_ifindex != prev_index) {
dev = __dev_get_by_index(net, pac->acl_ifindex);
prev_index = pac->acl_ifindex;
}
if (dev)
ipv6_dev_ac_dec(dev, &pac->acl_addr);
sock_kfree_s(sk, pac, sizeof(*pac));
pac = next;
}
}
void ipv6_sock_ac_close(struct sock *sk)
{
struct ipv6_pinfo *np = inet6_sk(sk);
if (!np->ipv6_ac_list)
return;
rtnl_lock();
__ipv6_sock_ac_close(sk);
rtnl_unlock();
}
static void ipv6_add_acaddr_hash(struct net *net, struct ifacaddr6 *aca)
{
unsigned int hash = inet6_acaddr_hash(net, &aca->aca_addr);
spin_lock(&acaddr_hash_lock);
hlist_add_head_rcu(&aca->aca_addr_lst, &inet6_acaddr_lst[hash]);
spin_unlock(&acaddr_hash_lock);
}
static void ipv6_del_acaddr_hash(struct ifacaddr6 *aca)
{
spin_lock(&acaddr_hash_lock);
hlist_del_init_rcu(&aca->aca_addr_lst);
spin_unlock(&acaddr_hash_lock);
}
static void aca_get(struct ifacaddr6 *aca)
{
refcount_inc(&aca->aca_refcnt);
}
static void aca_free_rcu(struct rcu_head *h)
{
struct ifacaddr6 *aca = container_of(h, struct ifacaddr6, rcu);
fib6_info_release(aca->aca_rt);
kfree(aca);
}
static void aca_put(struct ifacaddr6 *ac)
{
if (refcount_dec_and_test(&ac->aca_refcnt)) {
call_rcu(&ac->rcu, aca_free_rcu);
}
}
static struct ifacaddr6 *aca_alloc(struct fib6_info *f6i,
const struct in6_addr *addr)
{
struct ifacaddr6 *aca;
aca = kzalloc(sizeof(*aca), GFP_ATOMIC);
if (!aca)
return NULL;
aca->aca_addr = *addr;
fib6_info_hold(f6i);
aca->aca_rt = f6i;
INIT_HLIST_NODE(&aca->aca_addr_lst);
aca->aca_users = 1;
/* aca_tstamp should be updated upon changes */
aca->aca_cstamp = aca->aca_tstamp = jiffies;
refcount_set(&aca->aca_refcnt, 1);
return aca;
}
/*
* device anycast group inc (add if not found)
*/
int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
{
struct ifacaddr6 *aca;
struct fib6_info *f6i;
struct net *net;
int err;
ASSERT_RTNL();
write_lock_bh(&idev->lock);
if (idev->dead) {
err = -ENODEV;
goto out;
}
for (aca = rtnl_dereference(idev->ac_list); aca;
aca = rtnl_dereference(aca->aca_next)) {
if (ipv6_addr_equal(&aca->aca_addr, addr)) {
aca->aca_users++;
err = 0;
goto out;
}
}
net = dev_net(idev->dev);
f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC, NULL);
if (IS_ERR(f6i)) {
err = PTR_ERR(f6i);
goto out;
}
aca = aca_alloc(f6i, addr);
if (!aca) {
fib6_info_release(f6i);
err = -ENOMEM;
goto out;
}
/* Hold this for addrconf_join_solict() below before we unlock,
* it is already exposed via idev->ac_list.
*/
aca_get(aca);
aca->aca_next = idev->ac_list;
rcu_assign_pointer(idev->ac_list, aca);
write_unlock_bh(&idev->lock);
ipv6_add_acaddr_hash(net, aca);
ip6_ins_rt(net, f6i);
addrconf_join_solict(idev->dev, &aca->aca_addr);
aca_put(aca);
return 0;
out:
write_unlock_bh(&idev->lock);
return err;
}
/*
* device anycast group decrement
*/
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
{
struct ifacaddr6 *aca, *prev_aca;
ASSERT_RTNL();
write_lock_bh(&idev->lock);
prev_aca = NULL;
for (aca = rtnl_dereference(idev->ac_list); aca;
aca = rtnl_dereference(aca->aca_next)) {
if (ipv6_addr_equal(&aca->aca_addr, addr))
break;
prev_aca = aca;
}
if (!aca) {
write_unlock_bh(&idev->lock);
return -ENOENT;
}
if (--aca->aca_users > 0) {
write_unlock_bh(&idev->lock);
return 0;
}
if (prev_aca)
rcu_assign_pointer(prev_aca->aca_next, aca->aca_next);
else
rcu_assign_pointer(idev->ac_list, aca->aca_next);
write_unlock_bh(&idev->lock);
ipv6_del_acaddr_hash(aca);
addrconf_leave_solict(idev, &aca->aca_addr);
ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
aca_put(aca);
return 0;
}
/* called with rtnl_lock() */
static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
{
struct inet6_dev *idev = __in6_dev_get(dev);
if (!idev)
return -ENODEV;
return __ipv6_dev_ac_dec(idev, addr);
}
void ipv6_ac_destroy_dev(struct inet6_dev *idev)
{
struct ifacaddr6 *aca;
write_lock_bh(&idev->lock);
while ((aca = rtnl_dereference(idev->ac_list)) != NULL) {
rcu_assign_pointer(idev->ac_list, aca->aca_next);
write_unlock_bh(&idev->lock);
ipv6_del_acaddr_hash(aca);
addrconf_leave_solict(idev, &aca->aca_addr);
ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
aca_put(aca);
write_lock_bh(&idev->lock);
}
write_unlock_bh(&idev->lock);
}
/*
* check if the interface has this anycast address
* called with rcu_read_lock()
*/
static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr)
{
struct inet6_dev *idev;
struct ifacaddr6 *aca;
idev = __in6_dev_get(dev);
if (idev) {
for (aca = rcu_dereference(idev->ac_list); aca;
aca = rcu_dereference(aca->aca_next))
if (ipv6_addr_equal(&aca->aca_addr, addr))
break;
return aca != NULL;
}
return false;
}
/*
* check if given interface (or any, if dev==0) has this anycast address
*/
bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
const struct in6_addr *addr)
{
struct net_device *nh_dev;
struct ifacaddr6 *aca;
bool found = false;
rcu_read_lock();
if (dev)
found = ipv6_chk_acast_dev(dev, addr);
else {
unsigned int hash = inet6_acaddr_hash(net, addr);
hlist_for_each_entry_rcu(aca, &inet6_acaddr_lst[hash],
aca_addr_lst) {
nh_dev = fib6_info_nh_dev(aca->aca_rt);
if (!nh_dev || !net_eq(dev_net(nh_dev), net))
continue;
if (ipv6_addr_equal(&aca->aca_addr, addr)) {
found = true;
break;
}
}
}
rcu_read_unlock();
return found;
}
/* check if this anycast address is link-local on given interface or
* is global
*/
bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
const struct in6_addr *addr)
{
return ipv6_chk_acast_addr(net,
(ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ?
dev : NULL),
addr);
}
#ifdef CONFIG_PROC_FS
struct ac6_iter_state {
struct seq_net_private p;
struct net_device *dev;
};
#define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private)
static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
{
struct ac6_iter_state *state = ac6_seq_private(seq);
struct net *net = seq_file_net(seq);
struct ifacaddr6 *im = NULL;
for_each_netdev_rcu(net, state->dev) {
struct inet6_dev *idev;
idev = __in6_dev_get(state->dev);
if (!idev)
continue;
im = rcu_dereference(idev->ac_list);
if (im)
break;
}
return im;
}
static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)
{
struct ac6_iter_state *state = ac6_seq_private(seq);
struct inet6_dev *idev;
im = rcu_dereference(im->aca_next);
while (!im) {
state->dev = next_net_device_rcu(state->dev);
if (!state->dev)
break;
idev = __in6_dev_get(state->dev);
if (!idev)
continue;
im = rcu_dereference(idev->ac_list);
}
return im;
}
static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
{
struct ifacaddr6 *im = ac6_get_first(seq);
if (im)
while (pos && (im = ac6_get_next(seq, im)) != NULL)
--pos;
return pos ? NULL : im;
}
static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
rcu_read_lock();
return ac6_get_idx(seq, *pos);
}
static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct ifacaddr6 *im = ac6_get_next(seq, v);
++*pos;
return im;
}
static void ac6_seq_stop(struct seq_file *seq, void *v)
__releases(RCU)
{
rcu_read_unlock();
}
static int ac6_seq_show(struct seq_file *seq, void *v)
{
struct ifacaddr6 *im = (struct ifacaddr6 *)v;
struct ac6_iter_state *state = ac6_seq_private(seq);
seq_printf(seq, "%-4d %-15s %pi6 %5d\n",
state->dev->ifindex, state->dev->name,
&im->aca_addr, im->aca_users);
return 0;
}
static const struct seq_operations ac6_seq_ops = {
.start = ac6_seq_start,
.next = ac6_seq_next,
.stop = ac6_seq_stop,
.show = ac6_seq_show,
};
int __net_init ac6_proc_init(struct net *net)
{
if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops,
sizeof(struct ac6_iter_state)))
return -ENOMEM;
return 0;
}
void ac6_proc_exit(struct net *net)
{
remove_proc_entry("anycast6", net->proc_net);
}
#endif
/* Init / cleanup code
*/
int __init ipv6_anycast_init(void)
{
int i;
for (i = 0; i < IN6_ADDR_HSIZE; i++)
INIT_HLIST_HEAD(&inet6_acaddr_lst[i]);
return 0;
}
void ipv6_anycast_cleanup(void)
{
int i;
spin_lock(&acaddr_hash_lock);
for (i = 0; i < IN6_ADDR_HSIZE; i++)
WARN_ON(!hlist_empty(&inet6_acaddr_lst[i]));
spin_unlock(&acaddr_hash_lock);
}