[RFC Patch net-next 3/5] inetpeer: use generic union inet_addr

From: Cong Wang
Date: Thu Jun 27 2013 - 02:45:00 EST

Signed-off-by: Cong Wang <amwang@xxxxxxxxxx>
---
include/net/inetpeer.h | 29 +++++----------
net/ipv4/inetpeer.c | 35 +++++++++++-------
net/ipv4/tcp_metrics.c | 92 ++++++++++++++++++++----------------------------
3 files changed, 68 insertions(+), 88 deletions(-)

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 53f464d..7ec33fb 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -13,24 +13,13 @@
#include <linux/spinlock.h>
#include <linux/rtnetlink.h>
#include <net/ipv6.h>
+#include <net/inet_addr.h>
#include <linux/atomic.h>

-struct inetpeer_addr_base {
- union {
- __be32 a4;
- __be32 a6[4];
- };
-};
-
-struct inetpeer_addr {
- struct inetpeer_addr_base addr;
- __u16 family;
-};
-
struct inet_peer {
/* group together avl_left,avl_right,v4daddr to speedup lookups */
struct inet_peer __rcu *avl_left, *avl_right;
- struct inetpeer_addr daddr;
+ union inet_addr daddr;
__u32 avl_height;

u32 metrics[RTAX_MAX];
@@ -133,17 +122,17 @@ static inline bool inet_metrics_new(const struct inet_peer *p)

/* can be called with or without local BH being disabled */
struct inet_peer *inet_getpeer(struct inet_peer_base *base,
- const struct inetpeer_addr *daddr,
+ const union inet_addr *daddr,
int create);

static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
__be32 v4daddr,
int create)
{
- struct inetpeer_addr daddr;
+ union inet_addr daddr;

- daddr.addr.a4 = v4daddr;
- daddr.family = AF_INET;
+ daddr.sin.sin_addr.s_addr = v4daddr;
+ daddr.sa.sa_family = AF_INET;
return inet_getpeer(base, &daddr, create);
}

@@ -151,10 +140,10 @@ static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
const struct in6_addr *v6daddr,
int create)
{
- struct inetpeer_addr daddr;
+ union inet_addr daddr;

- *(struct in6_addr *)daddr.addr.a6 = *v6daddr;
- daddr.family = AF_INET6;
+ daddr.sin6.sin6_addr = *v6daddr;
+ daddr.sa.sa_family = AF_INET6;
return inet_getpeer(base, &daddr, create);
}

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index 000e3d2..94a9ba7 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -197,17 +197,24 @@ void __init inet_initpeers(void)
INIT_DEFERRABLE_WORK(&gc_work, inetpeer_gc_worker);
}

-static int addr_compare(const struct inetpeer_addr *a,
- const struct inetpeer_addr *b)
+static int addr_compare(const union inet_addr *a,
+ const union inet_addr *b)
{
- int i, n = (a->family == AF_INET ? 1 : 4);
+ int i;

- for (i = 0; i < n; i++) {
- if (a->addr.a6[i] == b->addr.a6[i])
- continue;
- if ((__force u32)a->addr.a6[i] < (__force u32)b->addr.a6[i])
+ if (a->sa.sa_family == AF_INET) {
+ if (a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr)
+ return 0;
+ if ((__force u32)a->sin.sin_addr.s_addr < (__force u32)b->sin.sin_addr.s_addr)
return -1;
- return 1;
+ } else {
+ for (i = 0; i < 4; i++) {
+ if (a->sin6.sin6_addr.s6_addr32[i] == b->sin6.sin6_addr.s6_addr32[i])
+ continue;
+ if ((__force u32)a->sin6.sin6_addr.s6_addr32[i] < (__force u32)b->sin6.sin6_addr.s6_addr32[i])
+ return -1;
+ return 1;
+ }
}

return 0;
@@ -248,7 +255,7 @@ static int addr_compare(const struct inetpeer_addr *a,
* But every pointer we follow is guaranteed to be valid thanks to RCU.
* We exit from this function if number of links exceeds PEER_MAXDEPTH
*/
-static struct inet_peer *lookup_rcu(const struct inetpeer_addr *daddr,
+static struct inet_peer *lookup_rcu(const union inet_addr *daddr,
struct inet_peer_base *base)
{
struct inet_peer *u = rcu_dereference(base->root);
@@ -457,7 +464,7 @@ static int inet_peer_gc(struct inet_peer_base *base,
}

struct inet_peer *inet_getpeer(struct inet_peer_base *base,
- const struct inetpeer_addr *daddr,
+ const union inet_addr *daddr,
int create)
{
struct inet_peer __rcu **stack[PEER_MAXDEPTH], ***stackptr;
@@ -465,7 +472,7 @@ struct inet_peer *inet_getpeer(struct inet_peer_base *base,
unsigned int sequence;
int invalidated, gccnt = 0;

- flush_check(base, daddr->family);
+ flush_check(base, daddr->sa.sa_family);

/* Attempt a lockless lookup first.
* Because of a concurrent writer, we might not find an existing entry.
@@ -505,9 +512,9 @@ relookup:
atomic_set(&p->refcnt, 1);
atomic_set(&p->rid, 0);
atomic_set(&p->ip_id_count,
- (daddr->family == AF_INET) ?
- secure_ip_id(daddr->addr.a4) :
- secure_ipv6_id(daddr->addr.a6));
+ (daddr->sa.sa_family == AF_INET) ?
+ secure_ip_id(daddr->sin.sin_addr.s_addr) :
+ secure_ipv6_id(daddr->sin6.sin6_addr.s6_addr32));
p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
p->rate_tokens = 0;
/* 60*HZ is arbitrary, but chosen enough high so that the first
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index f6a005c..10b3796 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -31,7 +31,7 @@ struct tcp_fastopen_metrics {

struct tcp_metrics_block {
struct tcp_metrics_block __rcu *tcpm_next;
- struct inetpeer_addr tcpm_addr;
+ union inet_addr tcpm_addr;
unsigned long tcpm_stamp;
u32 tcpm_ts;
u32 tcpm_ts_stamp;
@@ -74,22 +74,6 @@ static void tcp_metric_set_msecs(struct tcp_metrics_block *tm,
tm->tcpm_vals[idx] = jiffies_to_msecs(val);
}

-static bool addr_same(const struct inetpeer_addr *a,
- const struct inetpeer_addr *b)
-{
- const struct in6_addr *a6, *b6;
-
- if (a->family != b->family)
- return false;
- if (a->family == AF_INET)
- return a->addr.a4 == b->addr.a4;
-
- a6 = (const struct in6_addr *) &a->addr.a6[0];
- b6 = (const struct in6_addr *) &b->addr.a6[0];
-
- return ipv6_addr_equal(a6, b6);
-}
-
struct tcpm_hash_bucket {
struct tcp_metrics_block __rcu *chain;
};
@@ -131,7 +115,7 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst,
}

static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst,
- struct inetpeer_addr *addr,
+ union inet_addr *addr,
unsigned int hash,
bool reclaim)
{
@@ -189,7 +173,7 @@ static struct tcp_metrics_block *tcp_get_encode(struct tcp_metrics_block *tm, in
return NULL;
}

-static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *addr,
+static struct tcp_metrics_block *__tcp_get_metrics(const union inet_addr *addr,
struct net *net, unsigned int hash)
{
struct tcp_metrics_block *tm;
@@ -197,7 +181,7 @@ static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *a

for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
tm = rcu_dereference(tm->tcpm_next)) {
- if (addr_same(&tm->tcpm_addr, addr))
+ if (inet_addr_equal(&tm->tcpm_addr, addr))
break;
depth++;
}
@@ -208,18 +192,18 @@ static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req,
struct dst_entry *dst)
{
struct tcp_metrics_block *tm;
- struct inetpeer_addr addr;
+ union inet_addr addr;
unsigned int hash;
struct net *net;

- addr.family = req->rsk_ops->family;
- switch (addr.family) {
+ addr.sa.sa_family = req->rsk_ops->family;
+ switch (addr.sa.sa_family) {
case AF_INET:
- addr.addr.a4 = inet_rsk(req)->rmt_addr;
- hash = (__force unsigned int) addr.addr.a4;
+ addr.sin.sin_addr.s_addr = inet_rsk(req)->rmt_addr;
+ hash = (__force unsigned int) addr.sin.sin_addr.s_addr;
break;
case AF_INET6:
- *(struct in6_addr *)addr.addr.a6 = inet6_rsk(req)->rmt_addr;
+ addr.sin6.sin6_addr = inet6_rsk(req)->rmt_addr;
hash = ipv6_addr_hash(&inet6_rsk(req)->rmt_addr);
break;
default:
@@ -231,7 +215,7 @@ static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req,

for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
tm = rcu_dereference(tm->tcpm_next)) {
- if (addr_same(&tm->tcpm_addr, &addr))
+ if (inet_addr_equal(&tm->tcpm_addr, &addr))
break;
}
tcpm_check_stamp(tm, dst);
@@ -242,19 +226,19 @@ static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock
{
struct inet6_timewait_sock *tw6;
struct tcp_metrics_block *tm;
- struct inetpeer_addr addr;
+ union inet_addr addr;
unsigned int hash;
struct net *net;

- addr.family = tw->tw_family;
- switch (addr.family) {
+ addr.sa.sa_family = tw->tw_family;
+ switch (addr.sa.sa_family) {
case AF_INET:
- addr.addr.a4 = tw->tw_daddr;
- hash = (__force unsigned int) addr.addr.a4;
+ addr.sin.sin_addr.s_addr = tw->tw_daddr;
+ hash = (__force unsigned int) addr.sin.sin_addr.s_addr;
break;
case AF_INET6:
tw6 = inet6_twsk((struct sock *)tw);
- *(struct in6_addr *)addr.addr.a6 = tw6->tw_v6_daddr;
+ addr.sin6.sin6_addr = tw6->tw_v6_daddr;
hash = ipv6_addr_hash(&tw6->tw_v6_daddr);
break;
default:
@@ -266,7 +250,7 @@ static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock

for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
tm = rcu_dereference(tm->tcpm_next)) {
- if (addr_same(&tm->tcpm_addr, &addr))
+ if (inet_addr_equal(&tm->tcpm_addr, &addr))
break;
}
return tm;
@@ -277,19 +261,19 @@ static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk,
bool create)
{
struct tcp_metrics_block *tm;
- struct inetpeer_addr addr;
+ union inet_addr addr;
unsigned int hash;
struct net *net;
bool reclaim;

- addr.family = sk->sk_family;
- switch (addr.family) {
+ addr.sa.sa_family = sk->sk_family;
+ switch (addr.sa.sa_family) {
case AF_INET:
- addr.addr.a4 = inet_sk(sk)->inet_daddr;
- hash = (__force unsigned int) addr.addr.a4;
+ addr.sin.sin_addr.s_addr = inet_sk(sk)->inet_daddr;
+ hash = (__force unsigned int) addr.sin.sin_addr.s_addr;
break;
case AF_INET6:
- *(struct in6_addr *)addr.addr.a6 = inet6_sk(sk)->daddr;
+ addr.sin6.sin6_addr = inet6_sk(sk)->daddr;
hash = ipv6_addr_hash(&inet6_sk(sk)->daddr);
break;
default:
@@ -722,15 +706,15 @@ static int tcp_metrics_fill_info(struct sk_buff *msg,
struct nlattr *nest;
int i;

- switch (tm->tcpm_addr.family) {
+ switch (tm->tcpm_addr.sa.sa_family) {
case AF_INET:
if (nla_put_be32(msg, TCP_METRICS_ATTR_ADDR_IPV4,
- tm->tcpm_addr.addr.a4) < 0)
+ tm->tcpm_addr.sin.sin_addr.s_addr) < 0)
goto nla_put_failure;
break;
case AF_INET6:
if (nla_put(msg, TCP_METRICS_ATTR_ADDR_IPV6, 16,
- tm->tcpm_addr.addr.a6) < 0)
+ tm->tcpm_addr.sin6.sin6_addr.s6_addr32) < 0)
goto nla_put_failure;
break;
default:
@@ -853,25 +837,25 @@ done:
return skb->len;
}

-static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr,
+static int parse_nl_addr(struct genl_info *info, union inet_addr *addr,
unsigned int *hash, int optional)
{
struct nlattr *a;

a = info->attrs[TCP_METRICS_ATTR_ADDR_IPV4];
if (a) {
- addr->family = AF_INET;
- addr->addr.a4 = nla_get_be32(a);
- *hash = (__force unsigned int) addr->addr.a4;
+ addr->sa.sa_family = AF_INET;
+ addr->sin.sin_addr.s_addr = nla_get_be32(a);
+ *hash = (__force unsigned int) addr->sin.sin_addr.s_addr;
return 0;
}
a = info->attrs[TCP_METRICS_ATTR_ADDR_IPV6];
if (a) {
if (nla_len(a) != sizeof(struct in6_addr))
return -EINVAL;
- addr->family = AF_INET6;
- memcpy(addr->addr.a6, nla_data(a), sizeof(addr->addr.a6));
- *hash = ipv6_addr_hash((struct in6_addr *) addr->addr.a6);
+ addr->sa.sa_family = AF_INET6;
+ memcpy(&addr->sin6.sin6_addr, nla_data(a), sizeof(addr->sin6.sin6_addr));
+ *hash = ipv6_addr_hash(&addr->sin6.sin6_addr);
return 0;
}
return optional ? 1 : -EAFNOSUPPORT;
@@ -880,7 +864,7 @@ static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr,
static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct tcp_metrics_block *tm;
- struct inetpeer_addr addr;
+ union inet_addr addr;
unsigned int hash;
struct sk_buff *msg;
struct net *net = genl_info_net(info);
@@ -905,7 +889,7 @@ static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info)
rcu_read_lock();
for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
tm = rcu_dereference(tm->tcpm_next)) {
- if (addr_same(&tm->tcpm_addr, &addr)) {
+ if (inet_addr_equal(&tm->tcpm_addr, &addr)) {
ret = tcp_metrics_fill_info(msg, tm);
break;
}
@@ -960,7 +944,7 @@ static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info)
struct tcpm_hash_bucket *hb;
struct tcp_metrics_block *tm;
struct tcp_metrics_block __rcu **pp;
- struct inetpeer_addr addr;
+ union inet_addr addr;
unsigned int hash;
struct net *net = genl_info_net(info);
int ret;
@@ -977,7 +961,7 @@ static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info)
spin_lock_bh(&tcp_metrics_lock);
for (tm = deref_locked_genl(*pp); tm;
pp = &tm->tcpm_next, tm = deref_locked_genl(*pp)) {
- if (addr_same(&tm->tcpm_addr, &addr)) {
+ if (inet_addr_equal(&tm->tcpm_addr, &addr)) {
*pp = tm->tcpm_next;
break;
}
--
1.7.7.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/