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[IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls

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The current users of ip6_dst_lookup can be divided into two classes:

1) The caller holds no locks and is in user-context (UDP).
2) The caller does not want to lookup the dst cache at all.

The second class covers everyone except UDP because most people do
the cache lookup directly before calling ip6_dst_lookup.  This patch
adds ip6_sk_dst_lookup for the first class.

Similarly ip6_dst_store users can be divded into those that need to
take the socket dst lock and those that don't.  This patch adds
__ip6_dst_store for those (everyone except UDP/datagram) that don't
need an extra lock.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-07-30 20:19:33 -07:00 committed by David S. Miller
parent 679e898a47
commit 497c615aba
8 changed files with 100 additions and 49 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
include/net/ip6_route.h
View file

@ -139,16 +139,22 @@ extern rwlock_t rt6_lock;
/*
* Store a destination cache entry in a socket
*/
static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
struct in6_addr *daddr)
static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
struct in6_addr *daddr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct rt6_info *rt = (struct rt6_info *) dst;
write_lock(&sk->sk_dst_lock);
sk_setup_caps(sk, dst);
np->daddr_cache = daddr;
np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
}
static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
struct in6_addr *daddr)
{
write_lock(&sk->sk_dst_lock);
__ip6_dst_store(sk, dst, daddr);
write_unlock(&sk->sk_dst_lock);
}

3
include/net/ipv6.h
View file

@ -468,6 +468,9 @@ extern void ip6_flush_pending_frames(struct sock *sk);
extern int ip6_dst_lookup(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
extern int ip6_sk_dst_lookup(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
/*
* skb processing functions

4
net/dccp/ipv6.c
View file

@ -230,7 +230,7 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
ipv6_addr_copy(&np->saddr, saddr);
inet->rcv_saddr = LOOPBACK4_IPV6;
ip6_dst_store(sk, dst, NULL);
__ip6_dst_store(sk, dst, NULL);
icsk->icsk_ext_hdr_len = 0;
if (np->opt != NULL)
@ -863,7 +863,7 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
* comment in that function for the gory details. -acme
*/
ip6_dst_store(newsk, dst, NULL);
__ip6_dst_store(newsk, dst, NULL);
newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
NETIF_F_TSO);
newdp6 = (struct dccp6_sock *)newsk;

2
net/ipv6/af_inet6.c
View file

@ -658,7 +658,7 @@ int inet6_sk_rebuild_header(struct sock *sk)
return err;
}
ip6_dst_store(sk, dst, NULL);
__ip6_dst_store(sk, dst, NULL);
}
return 0;

2
net/ipv6/inet6_connection_sock.c
View file

@ -185,7 +185,7 @@ int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
return err;
}
ip6_dst_store(sk, dst, NULL);
__ip6_dst_store(sk, dst, NULL);
}
skb->dst = dst_clone(dst);

120
net/ipv6/ip6_output.c
View file

@ -723,48 +723,51 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
return err;
}
int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
struct dst_entry *dst,
struct flowi *fl)
{
int err = 0;
struct ipv6_pinfo *np = inet6_sk(sk);
struct rt6_info *rt = (struct rt6_info *)dst;
*dst = NULL;
if (sk) {
struct ipv6_pinfo *np = inet6_sk(sk);
*dst = sk_dst_check(sk, np->dst_cookie);
if (*dst) {
struct rt6_info *rt = (struct rt6_info*)*dst;
/* Yes, checking route validity in not connected
* case is not very simple. Take into account,
* that we do not support routing by source, TOS,
* and MSG_DONTROUTE --ANK (980726)
*
* 1. If route was host route, check that
* cached destination is current.
* If it is network route, we still may
* check its validity using saved pointer
* to the last used address: daddr_cache.
* We do not want to save whole address now,
* (because main consumer of this service
* is tcp, which has not this problem),
* so that the last trick works only on connected
* sockets.
* 2. oif also should be the same.
*/
if (((rt->rt6i_dst.plen != 128 ||
!ipv6_addr_equal(&fl->fl6_dst,
&rt->rt6i_dst.addr))
&& (np->daddr_cache == NULL ||
!ipv6_addr_equal(&fl->fl6_dst,
np->daddr_cache)))
|| (fl->oif && fl->oif != (*dst)->dev->ifindex)) {
dst_release(*dst);
*dst = NULL;
}
}
if (!dst)
goto out;
/* Yes, checking route validity in not connected
* case is not very simple. Take into account,
* that we do not support routing by source, TOS,
* and MSG_DONTROUTE --ANK (980726)
*
* 1. If route was host route, check that
* cached destination is current.
* If it is network route, we still may
* check its validity using saved pointer
* to the last used address: daddr_cache.
* We do not want to save whole address now,
* (because main consumer of this service
* is tcp, which has not this problem),
* so that the last trick works only on connected
* sockets.
* 2. oif also should be the same.
*/
if (((rt->rt6i_dst.plen != 128 ||
!ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr))
&& (np->daddr_cache == NULL ||
!ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache)))
|| (fl->oif && fl->oif != dst->dev->ifindex)) {
dst_release(dst);
dst = NULL;
}
out:
return dst;
}
static int ip6_dst_lookup_tail(struct sock *sk,
struct dst_entry **dst, struct flowi *fl)
{
int err;
if (*dst == NULL)
*dst = ip6_route_output(sk, fl);
@ -773,7 +776,6 @@ int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
if (ipv6_addr_any(&fl->fl6_src)) {
err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src);
if (err)
goto out_err_release;
}
@ -786,8 +788,48 @@ int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
return err;
}
/**
* ip6_dst_lookup - perform route lookup on flow
* @sk: socket which provides route info
* @dst: pointer to dst_entry * for result
* @fl: flow to lookup
*
* This function performs a route lookup on the given flow.
*
* It returns zero on success, or a standard errno code on error.
*/
int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
{
*dst = NULL;
return ip6_dst_lookup_tail(sk, dst, fl);
}
EXPORT_SYMBOL_GPL(ip6_dst_lookup);
/**
* ip6_sk_dst_lookup - perform socket cached route lookup on flow
* @sk: socket which provides the dst cache and route info
* @dst: pointer to dst_entry * for result
* @fl: flow to lookup
*
* This function performs a route lookup on the given flow with the
* possibility of using the cached route in the socket if it is valid.
* It will take the socket dst lock when operating on the dst cache.
* As a result, this function can only be used in process context.
*
* It returns zero on success, or a standard errno code on error.
*/
int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
{
*dst = NULL;
if (sk) {
*dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
*dst = ip6_sk_dst_check(sk, *dst, fl);
}
return ip6_dst_lookup_tail(sk, dst, fl);
}
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup);
static inline int ip6_ufo_append_data(struct sock *sk,
int getfrag(void *from, char *to, int offset, int len,
int odd, struct sk_buff *skb),

4
net/ipv6/tcp_ipv6.c
View file

@ -270,7 +270,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
inet->rcv_saddr = LOOPBACK4_IPV6;
sk->sk_gso_type = SKB_GSO_TCPV6;
ip6_dst_store(sk, dst, NULL);
__ip6_dst_store(sk, dst, NULL);
icsk->icsk_ext_hdr_len = 0;
if (np->opt)
@ -947,7 +947,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
*/
sk->sk_gso_type = SKB_GSO_TCPV6;
ip6_dst_store(newsk, dst, NULL);
__ip6_dst_store(newsk, dst, NULL);
newtcp6sk = (struct tcp6_sock *)newsk;
inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

2
net/ipv6/udp.c
View file

@ -782,7 +782,7 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
connected = 0;
}
err = ip6_dst_lookup(sk, &dst, fl);
err = ip6_sk_dst_lookup(sk, &dst, fl);
if (err)
goto out;
if (final_p)