From: Will Deacon <will@kernel.org>
To: gregkh@linuxfoundation.org
Cc: stable@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@android.com, g.nault@alphalink.fr,
Gao Feng <fgao@ikuai8.com>,
"David S . Miller" <davem@davemloft.net>,
Will Deacon <will@kernel.org>
Subject: [PATCH 6/8] l2tp: Refactor the codes with existing macros instead of literal number
Date: Thu, 2 Apr 2020 18:32:48 +0100 [thread overview]
Message-ID: <20200402173250.7858-7-will@kernel.org> (raw)
In-Reply-To: <20200402173250.7858-1-will@kernel.org>
From: Gao Feng <fgao@ikuai8.com>
commit 54c151d9ed1321e6e623c80ffe42cd2eb1571744 upstream.
Use PPP_ALLSTATIONS, PPP_UI, and SEND_SHUTDOWN instead of 0xff,
0x03, and 2 separately.
Signed-off-by: Gao Feng <fgao@ikuai8.com>
Acked-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Will Deacon <will@kernel.org>
---
net/l2tp/l2tp_ppp.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 97155145c0c5..98d4fa47b6a5 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -177,7 +177,7 @@ static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
if (!pskb_may_pull(skb, 2))
return 1;
- if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
+ if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
skb_pull(skb, 2);
return 0;
@@ -297,7 +297,6 @@ static void pppol2tp_session_sock_put(struct l2tp_session *session)
static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
size_t total_len)
{
- static const unsigned char ppph[2] = { 0xff, 0x03 };
struct sock *sk = sock->sk;
struct sk_buff *skb;
int error;
@@ -327,7 +326,7 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
error = -ENOMEM;
skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
uhlen + session->hdr_len +
- sizeof(ppph) + total_len,
+ 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
0, GFP_KERNEL);
if (!skb)
goto error_put_sess_tun;
@@ -340,8 +339,8 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
skb_reserve(skb, uhlen);
/* Add PPP header */
- skb->data[0] = ppph[0];
- skb->data[1] = ppph[1];
+ skb->data[0] = PPP_ALLSTATIONS;
+ skb->data[1] = PPP_UI;
skb_put(skb, 2);
/* Copy user data into skb */
@@ -384,7 +383,6 @@ error:
*/
static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
- static const u8 ppph[2] = { 0xff, 0x03 };
struct sock *sk = (struct sock *) chan->private;
struct sock *sk_tun;
struct l2tp_session *session;
@@ -413,14 +411,14 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
sizeof(struct iphdr) + /* IP header */
uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
session->hdr_len + /* L2TP header */
- sizeof(ppph); /* PPP header */
+ 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
if (skb_cow_head(skb, headroom))
goto abort_put_sess_tun;
/* Setup PPP header */
- __skb_push(skb, sizeof(ppph));
- skb->data[0] = ppph[0];
- skb->data[1] = ppph[1];
+ __skb_push(skb, 2);
+ skb->data[0] = PPP_ALLSTATIONS;
+ skb->data[1] = PPP_UI;
local_bh_disable();
l2tp_xmit_skb(session, skb, session->hdr_len);
@@ -455,7 +453,7 @@ static void pppol2tp_session_close(struct l2tp_session *session)
BUG_ON(session->magic != L2TP_SESSION_MAGIC);
if (sock) {
- inet_shutdown(sock, 2);
+ inet_shutdown(sock, SEND_SHUTDOWN);
/* Don't let the session go away before our socket does */
l2tp_session_inc_refcount(session);
}
--
2.26.0.rc2.310.g2932bb562d-goog
next prev parent reply other threads:[~2020-04-02 17:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 17:32 [PATCH 0/8] [backports] l2tp use-after-free fixes for 4.4 stable Will Deacon
2020-04-02 17:32 ` [PATCH 1/8] l2tp: Correctly return -EBADF from pppol2tp_getname Will Deacon
2020-04-02 17:32 ` [PATCH 2/8] net: l2tp: Make l2tp_ip6 namespace aware Will Deacon
2020-04-02 17:32 ` [PATCH 3/8] l2tp: fix race in l2tp_recv_common() Will Deacon
2020-04-02 17:32 ` [PATCH 4/8] l2tp: ensure session can't get removed during pppol2tp_session_ioctl() Will Deacon
2020-04-02 17:32 ` [PATCH 5/8] l2tp: fix duplicate session creation Will Deacon
2020-04-02 17:32 ` Will Deacon [this message]
2020-04-02 17:32 ` [PATCH 7/8] l2tp: ensure sessions are freed after their PPPOL2TP socket Will Deacon
2020-04-02 17:32 ` [PATCH 8/8] l2tp: fix race between l2tp_session_delete() and l2tp_tunnel_closeall() Will Deacon
2020-04-03 12:45 ` [PATCH 0/8] [backports] l2tp use-after-free fixes for 4.4 stable Greg KH
2020-04-03 13:22 ` Will Deacon
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