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net: ensure unbound stream socket to be chosen when not in a VRF 

The commit a04a480d43 ("net: Require exact match for TCP socket
lookups if dif is l3mdev") only ensures that the correct socket is
selected for packets in a VRF. However, there is no guarantee that
the unbound socket will be selected for packets when not in a VRF.
By checking for a device match in compute_score() also for the case
when there is no bound device and attaching a score to this, the
unbound socket is selected. And if a failure is returned when there
is no device match, this ensures that bound sockets are never selected,
even if there is no unbound socket.

Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Tested-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mike Manning 2018-11-07 15:36:03 +00:00 committed by David S. Miller
parent 3c82a21f43
commit e78190581a
4 changed files with 31 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/net/inet_hashtables.h
View File

@ -189,6 +189,17 @@ static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
hashinfo->ehash_locks = NULL;
}
static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
int dif, int sdif)
{
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
return inet_bound_dev_eq(!!net->ipv4.sysctl_tcp_l3mdev_accept,
bound_dev_if, dif, sdif);
#else
return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
#endif
}
struct inet_bind_bucket *
inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
struct inet_bind_hashbucket *head,

8
include/net/inet_sock.h
View File

@ -143,6 +143,14 @@ static inline int inet_sk_bound_l3mdev(const struct sock *sk)
return 0;
}
static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
int dif, int sdif)
{
if (!bound_dev_if)
return !sdif || l3mdev_accept;
return bound_dev_if == dif || bound_dev_if == sdif;
}
struct inet_cork {
unsigned int flags;
__be32 addr;

14
net/ipv4/inet_hashtables.c
View File

@ -235,6 +235,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
{
int score = -1;
struct inet_sock *inet = inet_sk(sk);
bool dev_match;
if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
!ipv6_only_sock(sk)) {
@ -245,15 +246,12 @@ static inline int compute_score(struct sock *sk, struct net *net,
return -1;
score += 4;
}
if (sk->sk_bound_dev_if || exact_dif) {
bool dev_match = (sk->sk_bound_dev_if == dif ||
sk->sk_bound_dev_if == sdif);
dev_match = inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
dif, sdif);
if (!dev_match)
return -1;
score += 4;
if (!dev_match)
return -1;
if (sk->sk_bound_dev_if)
score += 4;
}
if (sk->sk_incoming_cpu == raw_smp_processor_id())
score++;
}

14
net/ipv6/inet6_hashtables.c
View File

@ -99,6 +99,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
const int dif, const int sdif, bool exact_dif)
{
int score = -1;
bool dev_match;
if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
sk->sk_family == PF_INET6) {
@ -109,15 +110,12 @@ static inline int compute_score(struct sock *sk, struct net *net,
return -1;
score++;
}
if (sk->sk_bound_dev_if || exact_dif) {
bool dev_match = (sk->sk_bound_dev_if == dif ||
sk->sk_bound_dev_if == sdif);
dev_match = inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
dif, sdif);
if (!dev_match)
return -1;
score++;
if (!dev_match)
return -1;
if (sk->sk_bound_dev_if)
score++;
}
if (sk->sk_incoming_cpu == raw_smp_processor_id())
score++;
}