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Message-Id: <8288dd74edeacd1f9260842a1fda805ff8d5ae64.1411308211.git.hannes@stressinduktion.org>
Date: Sun, 21 Sep 2014 16:11:52 +0200
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: netdev@...r.kernel.org
Cc: eric.dumazet@...il.com, hideaki@...hifuji.org, vyasevich@...il.com,
nicolas.dichtel@...nd.com, kafai@...com
Subject: [PATCH v2 net-next 8/9] ipv6: switch rt_sernum to atomic_t and clean up types
Switch rt_sernum to atomic_t, make it concurrency safe (the old scheme
looked broken to me) and switch from u32 to int types for the fn_sernum.
(fib6_new_sernum only gets used with table locks, but different tables
can get mutated at the same time.)
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: YOSHIFUJI Hideaki <hideaki@...hifuji.org>
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: Martin Lau <kafai@...com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
include/net/ip6_fib.h | 2 +-
include/net/netns/ipv6.h | 2 +-
net/ipv6/af_inet6.c | 2 +-
net/ipv6/ip6_fib.c | 29 +++++++++++++++--------------
4 files changed, 18 insertions(+), 17 deletions(-)
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index a09e554..5440f99 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -64,7 +64,7 @@ struct fib6_node {
__u16 fn_bit; /* bit key */
__u16 fn_flags;
- u32 fn_sernum;
+ int fn_sernum;
struct rt6_info *rr_ptr;
};
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 2319949..7dee21b 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -76,7 +76,7 @@ struct netns_ipv6 {
#endif
#endif
atomic_t dev_addr_genid;
- u32 rt_sernum;
+ atomic_t rt_sernum;
};
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 7ff8996..6cde9b4 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -766,7 +766,7 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.icmpv6_time = 1*HZ;
net->ipv6.sysctl.flowlabel_consistency = 1;
net->ipv6.sysctl.auto_flowlabels = 0;
- net->ipv6.rt_sernum = 1;
+ atomic_set(&net->ipv6.rt_sernum, 1);
err = ipv6_init_mibs(net);
if (err)
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 9f973e4..ae87d0c 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -50,7 +50,7 @@ struct fib6_cleaner_t {
struct fib6_walker_t w;
struct net *net;
int (*func)(struct rt6_info *, void *arg);
- u32 sernum;
+ int sernum;
void *arg;
};
@@ -63,7 +63,7 @@ static DEFINE_RWLOCK(fib6_walker_lock);
#endif
static void fib6_prune_clones(struct net *net, struct fib6_node *fn,
- u32 sernum);
+ int sernum);
static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn);
static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn);
static int fib6_walk(struct fib6_walker_t *w);
@@ -97,15 +97,16 @@ static inline void fib6_walker_unlink(struct fib6_walker_t *w)
static u32 fib6_new_sernum(struct net *net)
{
- int *n = &net->ipv6.rt_sernum;
+ int old, new;
- ++*n;
- if ((s32)*n <= 0)
- *n = 1;
- return *n;
+ do {
+ old = atomic_read(&net->ipv6.rt_sernum);
+ new = old < INT_MAX ? old + 1 : 1;
+ } while (atomic_cmpxchg(&net->ipv6.rt_sernum, old, new) != old);
+ return new;
}
-#define FIB6_NO_SERNUM_CHANGE (0U)
+#define FIB6_NO_SERNUM_CHANGE (0)
/*
* Auxiliary address test functions for the radix tree.
@@ -418,7 +419,7 @@ out:
static struct fib6_node *fib6_add_1(struct fib6_node *root,
struct in6_addr *addr, int plen,
int offset, int allow_create,
- int replace_required, u32 sernum)
+ int replace_required, int sernum)
{
struct fib6_node *fn, *in, *ln;
struct fib6_node *pn = NULL;
@@ -842,7 +843,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info,
int err = -ENOMEM;
int allow_create = 1;
int replace_required = 0;
- u32 sernum = fib6_new_sernum(dev_net(rt->dst.dev));
+ int sernum = fib6_new_sernum(dev_net(rt->dst.dev));
if (info->nlh) {
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
@@ -1558,7 +1559,7 @@ static int fib6_clean_node(struct fib6_walker_t *w)
static void fib6_clean_tree(struct net *net, struct fib6_node *root,
int (*func)(struct rt6_info *, void *arg),
- bool prune, u32 sernum, void *arg)
+ bool prune, int sernum, void *arg)
{
struct fib6_cleaner_t c;
@@ -1577,7 +1578,7 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root,
void __fib6_clean_all(struct net *net,
int (*func)(struct rt6_info *, void *arg),
- u32 sernum, void *arg)
+ int sernum, void *arg)
{
struct fib6_table *table;
struct hlist_head *head;
@@ -1617,7 +1618,7 @@ static int fib6_prune_clone(struct rt6_info *rt, void *arg)
return 0;
}
-static void fib6_prune_clones(struct net *net, struct fib6_node *fn, u32 sernum)
+static void fib6_prune_clones(struct net *net, struct fib6_node *fn, int sernum)
{
fib6_clean_tree(net, fn, fib6_prune_clone, true, sernum, NULL);
}
@@ -1830,7 +1831,7 @@ struct ipv6_route_iter {
struct fib6_walker_t w;
loff_t skip;
struct fib6_table *tbl;
- u32 sernum;
+ int sernum;
};
static int ipv6_route_seq_show(struct seq_file *seq, void *v)
--
1.9.3
--
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