From 10931923b5a5624d254ec3c8db6970f63b277cac Mon Sep 17 00:00:00 2001
From: Andreas Schultz <aschultz@tpip.net>
Date: Thu, 26 Jan 2017 16:21:48 +0100
Subject: [PATCH 1/2] gtp: remove unnecessary rcu_read_lock
The rcu read lock is hold by default in the ip input path. There
is no need to hold it twice in the socket recv decapsulate code path.
Signed-off-by: Andreas Schultz <aschultz@tpip.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/gtp.c | 24 ++++--------------------
1 file changed, 4 insertions(+), 20 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 99d3df788ce8..e11a1ead3228 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -183,7 +183,6 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
sizeof(struct gtp0_header);
struct gtp0_header *gtp0;
struct pdp_ctx *pctx;
- int ret = 0;
if (!pskb_may_pull(skb, hdrlen))
return -1;
@@ -196,26 +195,19 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
if (gtp0->type != GTP_TPDU)
return 1;
- rcu_read_lock();
pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
if (!pctx) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- ret = -1;
- goto out_rcu;
+ return -1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- ret = -1;
- goto out_rcu;
+ return -1;
}
- rcu_read_unlock();
/* Get rid of the GTP + UDP headers. */
return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
-out_rcu:
- rcu_read_unlock();
- return ret;
}
static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
@@ -225,7 +217,6 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
sizeof(struct gtp1_header);
struct gtp1_header *gtp1;
struct pdp_ctx *pctx;
- int ret = 0;
if (!pskb_may_pull(skb, hdrlen))
return -1;
@@ -253,26 +244,19 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
- rcu_read_lock();
pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
if (!pctx) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- ret = -1;
- goto out_rcu;
+ return -1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- ret = -1;
- goto out_rcu;
+ return -1;
}
- rcu_read_unlock();
/* Get rid of the GTP + UDP headers. */
return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
-out_rcu:
- rcu_read_unlock();
- return ret;
}
static void gtp_encap_disable(struct gtp_dev *gtp)
From 1796a81de4fbd3a93290de61e443ea4153ad28d4 Mon Sep 17 00:00:00 2001
From: Andreas Schultz <aschultz@tpip.net>
Date: Thu, 26 Jan 2017 16:21:49 +0100
Subject: [PATCH 2/2] gtp: let userspace handle packets for invalid tunnels
enable userspace to send error replies for invalid tunnels
Acked-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Andreas Schultz <aschultz@tpip.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/gtp.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index e11a1ead3228..bda0c6413450 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -198,12 +198,12 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
if (!pctx) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- return -1;
+ return 1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- return -1;
+ return 1;
}
/* Get rid of the GTP + UDP headers. */
@@ -247,12 +247,12 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
if (!pctx) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- return -1;
+ return 1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- return -1;
+ return 1;
}
/* Get rid of the GTP + UDP headers. */