From a4346210c4e092de50594b728300766121a3b00d Mon Sep 17 00:00:00 2001 From: Guillaume Nault Date: Tue, 31 Oct 2017 17:36:42 +0100 Subject: [PATCH] l2tp: remove ->ref() and ->deref() The ->ref() and ->deref() callbacks are unused since PPP stopped using them in ee40fb2e1eb5 ("l2tp: protect sock pointer of struct pppol2tp_session with RCU"). We can thus remove them from struct l2tp_session and drop the do_ref parameter of l2tp_session_get*(). Signed-off-by: Guillaume Nault Signed-off-by: David S. Miller --- net/l2tp/l2tp_core.c | 52 +++++++---------------------------------- net/l2tp/l2tp_core.h | 10 +++----- net/l2tp/l2tp_debugfs.c | 4 +--- net/l2tp/l2tp_ip.c | 4 +--- net/l2tp/l2tp_ip6.c | 4 +--- net/l2tp/l2tp_netlink.c | 20 +++++++--------- net/l2tp/l2tp_ppp.c | 10 +++----- 7 files changed, 25 insertions(+), 79 deletions(-) diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index a1d56e143fcd..216f49aec16f 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -216,12 +216,10 @@ struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id) } EXPORT_SYMBOL_GPL(l2tp_tunnel_get); -/* Lookup a session. A new reference is held on the returned session. - * Optionally calls session->ref() too if do_ref is true. - */ +/* Lookup a session. A new reference is held on the returned session. */ struct l2tp_session *l2tp_session_get(const struct net *net, struct l2tp_tunnel *tunnel, - u32 session_id, bool do_ref) + u32 session_id) { struct hlist_head *session_list; struct l2tp_session *session; @@ -235,8 +233,6 @@ struct l2tp_session *l2tp_session_get(const struct net *net, hlist_for_each_entry_rcu(session, session_list, global_hlist) { if (session->session_id == session_id) { l2tp_session_inc_refcount(session); - if (do_ref && session->ref) - session->ref(session); rcu_read_unlock_bh(); return session; @@ -252,8 +248,6 @@ struct l2tp_session *l2tp_session_get(const struct net *net, hlist_for_each_entry(session, session_list, hlist) { if (session->session_id == session_id) { l2tp_session_inc_refcount(session); - if (do_ref && session->ref) - session->ref(session); read_unlock_bh(&tunnel->hlist_lock); return session; @@ -265,8 +259,7 @@ struct l2tp_session *l2tp_session_get(const struct net *net, } EXPORT_SYMBOL_GPL(l2tp_session_get); -struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth, - bool do_ref) +struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth) { int hash; struct l2tp_session *session; @@ -277,8 +270,6 @@ struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth, hlist_for_each_entry(session, &tunnel->session_hlist[hash], hlist) { if (++count > nth) { l2tp_session_inc_refcount(session); - if (do_ref && session->ref) - session->ref(session); read_unlock_bh(&tunnel->hlist_lock); return session; } @@ -295,8 +286,7 @@ EXPORT_SYMBOL_GPL(l2tp_session_get_nth); * This is very inefficient but is only used by management interfaces. */ struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net, - const char *ifname, - bool do_ref) + const char *ifname) { struct l2tp_net *pn = l2tp_pernet(net); int hash; @@ -307,8 +297,6 @@ struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net, hlist_for_each_entry_rcu(session, &pn->l2tp_session_hlist[hash], global_hlist) { if (!strcmp(session->ifname, ifname)) { l2tp_session_inc_refcount(session); - if (do_ref && session->ref) - session->ref(session); rcu_read_unlock_bh(); return session; @@ -489,9 +477,6 @@ static void l2tp_recv_dequeue_skb(struct l2tp_session *session, struct sk_buff * (*session->recv_skb)(session, skb, L2TP_SKB_CB(skb)->length); else kfree_skb(skb); - - if (session->deref) - (*session->deref)(session); } /* Dequeue skbs from the session's reorder_q, subject to packet order. @@ -520,8 +505,6 @@ start: session->reorder_skip = 1; __skb_unlink(skb, &session->reorder_q); kfree_skb(skb); - if (session->deref) - (*session->deref)(session); continue; } @@ -694,9 +677,6 @@ discard: * a data (not control) frame before coming here. Fields up to the * session-id have already been parsed and ptr points to the data * after the session-id. - * - * session->ref() must have been called prior to l2tp_recv_common(). - * session->deref() will be called automatically after skb is processed. */ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, unsigned char *ptr, unsigned char *optr, u16 hdrflags, @@ -863,9 +843,6 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, discard: atomic_long_inc(&session->stats.rx_errors); kfree_skb(skb); - - if (session->deref) - (*session->deref)(session); } EXPORT_SYMBOL(l2tp_recv_common); @@ -879,8 +856,6 @@ int l2tp_session_queue_purge(struct l2tp_session *session) while ((skb = skb_dequeue(&session->reorder_q))) { atomic_long_inc(&session->stats.rx_errors); kfree_skb(skb); - if (session->deref) - (*session->deref)(session); } return 0; } @@ -972,13 +947,10 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb, } /* Find the session context */ - session = l2tp_session_get(tunnel->l2tp_net, tunnel, session_id, true); + session = l2tp_session_get(tunnel->l2tp_net, tunnel, session_id); if (!session || !session->recv_skb) { - if (session) { - if (session->deref) - session->deref(session); + if (session) l2tp_session_dec_refcount(session); - } /* Not found? Pass to userspace to deal with */ l2tp_info(tunnel, L2TP_MSG_DATA, @@ -1322,9 +1294,6 @@ again: if (test_and_set_bit(0, &session->dead)) goto again; - if (session->ref != NULL) - (*session->ref)(session); - write_unlock_bh(&tunnel->hlist_lock); __l2tp_session_unhash(session); @@ -1333,9 +1302,6 @@ again: if (session->session_close != NULL) (*session->session_close)(session); - if (session->deref != NULL) - (*session->deref)(session); - l2tp_session_dec_refcount(session); write_lock_bh(&tunnel->hlist_lock); @@ -1759,15 +1725,13 @@ int l2tp_session_delete(struct l2tp_session *session) if (test_and_set_bit(0, &session->dead)) return 0; - if (session->ref) - (*session->ref)(session); __l2tp_session_unhash(session); l2tp_session_queue_purge(session); if (session->session_close != NULL) (*session->session_close)(session); - if (session->deref) - (*session->deref)(session); + l2tp_session_dec_refcount(session); + return 0; } EXPORT_SYMBOL_GPL(l2tp_session_delete); diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h index 77caa5966736..92c90e72259c 100644 --- a/net/l2tp/l2tp_core.h +++ b/net/l2tp/l2tp_core.h @@ -129,8 +129,6 @@ struct l2tp_session { int (*build_header)(struct l2tp_session *session, void *buf); void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len); void (*session_close)(struct l2tp_session *session); - void (*ref)(struct l2tp_session *session); - void (*deref)(struct l2tp_session *session); #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) void (*show)(struct seq_file *m, void *priv); #endif @@ -245,12 +243,10 @@ struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id); struct l2tp_session *l2tp_session_get(const struct net *net, struct l2tp_tunnel *tunnel, - u32 session_id, bool do_ref); -struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth, - bool do_ref); + u32 session_id); +struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth); struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net, - const char *ifname, - bool do_ref); + const char *ifname); struct l2tp_tunnel *l2tp_tunnel_find(const struct net *net, u32 tunnel_id); struct l2tp_tunnel *l2tp_tunnel_find_nth(const struct net *net, int nth); diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c index 53bae54c4d6e..eb69411bcb47 100644 --- a/net/l2tp/l2tp_debugfs.c +++ b/net/l2tp/l2tp_debugfs.c @@ -53,7 +53,7 @@ static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd) static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd) { - pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true); + pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); pd->session_idx++; if (pd->session == NULL) { @@ -241,8 +241,6 @@ static int l2tp_dfs_seq_show(struct seq_file *m, void *v) l2tp_dfs_seq_tunnel_show(m, pd->tunnel); } else { l2tp_dfs_seq_session_show(m, pd->session); - if (pd->session->deref) - pd->session->deref(pd->session); l2tp_session_dec_refcount(pd->session); } diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c index 4d322c1b7233..6dbe450400a2 100644 --- a/net/l2tp/l2tp_ip.c +++ b/net/l2tp/l2tp_ip.c @@ -143,7 +143,7 @@ static int l2tp_ip_recv(struct sk_buff *skb) } /* Ok, this is a data packet. Lookup the session. */ - session = l2tp_session_get(net, NULL, session_id, true); + session = l2tp_session_get(net, NULL, session_id); if (!session) goto discard; @@ -205,8 +205,6 @@ pass_up: return sk_receive_skb(sk, skb, 1); discard_sess: - if (session->deref) - session->deref(session); l2tp_session_dec_refcount(session); goto discard; diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index 88b397c30d86..59ebb6e4f735 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -156,7 +156,7 @@ static int l2tp_ip6_recv(struct sk_buff *skb) } /* Ok, this is a data packet. Lookup the session. */ - session = l2tp_session_get(net, NULL, session_id, true); + session = l2tp_session_get(net, NULL, session_id); if (!session) goto discard; @@ -219,8 +219,6 @@ pass_up: return sk_receive_skb(sk, skb, 1); discard_sess: - if (session->deref) - session->deref(session); l2tp_session_dec_refcount(session); goto discard; diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c index f04fb347d251..a1f24fb2be98 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -48,8 +48,7 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, /* Accessed under genl lock */ static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX]; -static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info, - bool do_ref) +static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info) { u32 tunnel_id; u32 session_id; @@ -60,15 +59,14 @@ static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info, if (info->attrs[L2TP_ATTR_IFNAME]) { ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); - session = l2tp_session_get_by_ifname(net, ifname, do_ref); + session = l2tp_session_get_by_ifname(net, ifname); } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) && (info->attrs[L2TP_ATTR_CONN_ID])) { tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); tunnel = l2tp_tunnel_get(net, tunnel_id); if (tunnel) { - session = l2tp_session_get(net, tunnel, session_id, - do_ref); + session = l2tp_session_get(net, tunnel, session_id); l2tp_tunnel_dec_refcount(tunnel); } } @@ -649,7 +647,7 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf &cfg); if (ret >= 0) { - session = l2tp_session_get(net, tunnel, session_id, false); + session = l2tp_session_get(net, tunnel, session_id); if (session) { ret = l2tp_session_notify(&l2tp_nl_family, info, session, L2TP_CMD_SESSION_CREATE); @@ -669,7 +667,7 @@ static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *inf struct l2tp_session *session; u16 pw_type; - session = l2tp_nl_session_get(info, true); + session = l2tp_nl_session_get(info); if (session == NULL) { ret = -ENODEV; goto out; @@ -683,8 +681,6 @@ static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *inf if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); - if (session->deref) - session->deref(session); l2tp_session_dec_refcount(session); out: @@ -696,7 +692,7 @@ static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *inf int ret = 0; struct l2tp_session *session; - session = l2tp_nl_session_get(info, false); + session = l2tp_nl_session_get(info); if (session == NULL) { ret = -ENODEV; goto out; @@ -828,7 +824,7 @@ static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) struct sk_buff *msg; int ret; - session = l2tp_nl_session_get(info, false); + session = l2tp_nl_session_get(info); if (session == NULL) { ret = -ENODEV; goto err; @@ -874,7 +870,7 @@ static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback goto out; } - session = l2tp_session_get_nth(tunnel, si, false); + session = l2tp_session_get_nth(tunnel, si); if (session == NULL) { ti++; tunnel = NULL; diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 845aba543dce..535db8319769 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -742,7 +742,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, if (tunnel->peer_tunnel_id == 0) tunnel->peer_tunnel_id = peer_tunnel_id; - session = l2tp_session_get(sock_net(sk), tunnel, session_id, false); + session = l2tp_session_get(sock_net(sk), tunnel, session_id); if (session) { drop_refcnt = true; ps = l2tp_session_priv(session); @@ -1193,13 +1193,11 @@ static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, /* resend to session ioctl handler */ struct l2tp_session *session = l2tp_session_get(sock_net(sk), tunnel, - stats.session_id, true); + stats.session_id); if (session) { err = pppol2tp_session_ioctl(session, cmd, arg); - if (session->deref) - session->deref(session); l2tp_session_dec_refcount(session); } else { err = -EBADR; @@ -1615,7 +1613,7 @@ static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) { - pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true); + pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); pd->session_idx++; if (pd->session == NULL) { @@ -1758,8 +1756,6 @@ static int pppol2tp_seq_show(struct seq_file *m, void *v) pppol2tp_seq_tunnel_show(m, pd->tunnel); } else { pppol2tp_seq_session_show(m, pd->session); - if (pd->session->deref) - pd->session->deref(pd->session); l2tp_session_dec_refcount(pd->session); } -- 2.30.2