diff options
author | Kuniyuki Iwashima <kuniyu@amazon.co.jp> | 2021-11-24 05:14:21 +0300 |
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committer | Jakub Kicinski <kuba@kernel.org> | 2021-11-27 05:01:54 +0300 |
commit | fa39ef0e472961baef49ddb0e6f7b8ebb555bd8f (patch) | |
tree | 58bfa35ce6160b5849342e6aaab52e21805ec374 /net/unix | |
parent | f7ed31f4615f4e1d97c0e4325c5b8a240e10073c (diff) | |
download | linux-fa39ef0e472961baef49ddb0e6f7b8ebb555bd8f.tar.xz |
af_unix: Factorise unix_find_other() based on address types.
As done in the commit fa42d910a38e ("unix_bind(): take BSD and abstract
address cases into new helpers"), this patch moves BSD and abstract address
cases from unix_find_other() into unix_find_bsd() and unix_find_abstract().
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/unix')
-rw-r--r-- | net/unix/af_unix.c | 136 |
1 files changed, 81 insertions, 55 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 0fef54aed84e..d3cd33ba2923 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -950,6 +950,87 @@ static int unix_release(struct socket *sock) return 0; } +static struct sock *unix_find_bsd(struct net *net, struct sockaddr_un *sunaddr, + int type, int *error) +{ + struct inode *inode; + struct path path; + struct sock *sk; + int err; + + err = kern_path(sunaddr->sun_path, LOOKUP_FOLLOW, &path); + if (err) + goto fail; + + err = path_permission(&path, MAY_WRITE); + if (err) + goto path_put; + + err = -ECONNREFUSED; + inode = d_backing_inode(path.dentry); + if (!S_ISSOCK(inode->i_mode)) + goto path_put; + + sk = unix_find_socket_byinode(inode); + if (!sk) + goto path_put; + + err = -EPROTOTYPE; + if (sk->sk_type == type) + touch_atime(&path); + else + goto sock_put; + + path_put(&path); + + return sk; + +sock_put: + sock_put(sk); +path_put: + path_put(&path); +fail: + *error = err; + return NULL; +} + +static struct sock *unix_find_abstract(struct net *net, + struct sockaddr_un *sunaddr, + int addr_len, int type, + unsigned int hash, int *error) +{ + struct dentry *dentry; + struct sock *sk; + + sk = unix_find_socket_byname(net, sunaddr, addr_len, type ^ hash); + if (!sk) { + *error = -ECONNREFUSED; + return NULL; + } + + dentry = unix_sk(sk)->path.dentry; + if (dentry) + touch_atime(&unix_sk(sk)->path); + + return sk; +} + +static struct sock *unix_find_other(struct net *net, + struct sockaddr_un *sunaddr, + int addr_len, int type, + unsigned int hash, int *error) +{ + struct sock *sk; + + if (sunaddr->sun_path[0]) + sk = unix_find_bsd(net, sunaddr, type, error); + else + sk = unix_find_abstract(net, sunaddr, addr_len, type, hash, + error); + + return sk; +} + static int unix_autobind(struct sock *sk) { struct unix_sock *u = unix_sk(sk); @@ -1008,61 +1089,6 @@ out: mutex_unlock(&u->bindlock); return err; } -static struct sock *unix_find_other(struct net *net, - struct sockaddr_un *sunname, int len, - int type, unsigned int hash, int *error) -{ - struct sock *u; - struct path path; - int err = 0; - - if (sunname->sun_path[0]) { - struct inode *inode; - err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); - if (err) - goto fail; - inode = d_backing_inode(path.dentry); - err = path_permission(&path, MAY_WRITE); - if (err) - goto put_fail; - - err = -ECONNREFUSED; - if (!S_ISSOCK(inode->i_mode)) - goto put_fail; - u = unix_find_socket_byinode(inode); - if (!u) - goto put_fail; - - if (u->sk_type == type) - touch_atime(&path); - - path_put(&path); - - err = -EPROTOTYPE; - if (u->sk_type != type) { - sock_put(u); - goto fail; - } - } else { - err = -ECONNREFUSED; - u = unix_find_socket_byname(net, sunname, len, type ^ hash); - if (u) { - struct dentry *dentry; - dentry = unix_sk(u)->path.dentry; - if (dentry) - touch_atime(&unix_sk(u)->path); - } else - goto fail; - } - return u; - -put_fail: - path_put(&path); -fail: - *error = err; - return NULL; -} - static int unix_bind_bsd(struct sock *sk, struct unix_address *addr) { struct unix_sock *u = unix_sk(sk); |