9 Mar
2017
9 Mar
'17
5:43 p.m.
Having the socket present in context simplifies the sending logic.
It also fixes the invalid assumption that we have to use the same
sending socket for all client IP's on a specific gtp interface.
Signed-off-by: Andreas Schultz <aschultz(a)tpip.net>
---
drivers/net/gtp.c | 94 +++++++++++++++++++++++++++----------------------------
1 file changed, 47 insertions(+), 47 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index d58f46f..3e1854f 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -58,6 +58,7 @@ struct pdp_ctx {
struct in_addr ms_addr_ip4;
struct in_addr sgsn_addr_ip4;
+ struct sock *sk;
struct net_device *dev;
atomic_t tx_seq;
@@ -179,8 +180,7 @@ static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx
*pctx,
return false;
}
-static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, unsigned int hdrlen,
- bool xnet)
+static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, unsigned int hdrlen)
{
struct pcpu_sw_netstats *stats;
@@ -190,7 +190,8 @@ static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, unsigned
int hdrlen
}
/* Get rid of the GTP + UDP headers. */
- if (iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet))
+ if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
+ !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
return -1;
netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
@@ -214,8 +215,7 @@ static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, unsigned
int hdrlen
}
/* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
-static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
- bool xnet)
+static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
{
unsigned int hdrlen = sizeof(struct udphdr) +
sizeof(struct gtp0_header);
@@ -239,11 +239,10 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff
*skb,
return 1;
}
- return gtp_rx(pctx, skb, hdrlen, xnet);
+ return gtp_rx(pctx, skb, hdrlen);
}
-static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
- bool xnet)
+static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
{
unsigned int hdrlen = sizeof(struct udphdr) +
sizeof(struct gtp1_header);
@@ -282,7 +281,7 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff
*skb,
return 1;
}
- return gtp_rx(pctx, skb, hdrlen, xnet);
+ return gtp_rx(pctx, skb, hdrlen);
}
static void gtp_encap_destroy(struct sock *sk)
@@ -318,7 +317,6 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
struct gtp_dev *gtp;
int ret = 0;
- bool xnet;
gtp = rcu_dereference_sk_user_data(sk);
if (!gtp)
@@ -326,16 +324,14 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
- xnet = !net_eq(sock_net(sk), dev_net(gtp->dev));
-
switch (udp_sk(sk)->encap_type) {
case UDP_ENCAP_GTP0:
netdev_dbg(gtp->dev, "received GTP0 packet\n");
- ret = gtp0_udp_encap_recv(gtp, skb, xnet);
+ ret = gtp0_udp_encap_recv(gtp, skb);
break;
case UDP_ENCAP_GTP1U:
netdev_dbg(gtp->dev, "received GTP1U packet\n");
- ret = gtp1u_udp_encap_recv(gtp, skb, xnet);
+ ret = gtp1u_udp_encap_recv(gtp, skb);
break;
default:
ret = -1; /* Shouldn't happen. */
@@ -378,8 +374,9 @@ static void gtp_dev_uninit(struct net_device *dev)
free_percpu(dev->tstats);
}
-static struct rtable *ip4_route_output_gtp(struct net *net, struct flowi4 *fl4,
- const struct sock *sk, __be32 daddr)
+static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
+ const struct sock *sk,
+ __be32 daddr)
{
memset(fl4, 0, sizeof(*fl4));
fl4->flowi4_oif = sk->sk_bound_dev_if;
@@ -388,7 +385,7 @@ static struct rtable *ip4_route_output_gtp(struct net *net, struct
flowi4 *fl4,
fl4->flowi4_tos = RT_CONN_FLAGS(sk);
fl4->flowi4_proto = sk->sk_protocol;
- return ip_route_output_key(net, fl4);
+ return ip_route_output_key(sock_net(sk), fl4);
}
static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
@@ -477,7 +474,6 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device
*dev,
struct rtable *rt;
struct flowi4 fl4;
struct iphdr *iph;
- struct sock *sk;
__be16 df;
int mtu;
@@ -493,30 +489,7 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device
*dev,
}
netdev_dbg(dev, "found PDP context %p\n", pctx);
- switch (pctx->gtp_version) {
- case GTP_V0:
- if (gtp->sk0)
- sk = gtp->sk0;
- else
- sk = NULL;
- break;
- case GTP_V1:
- if (gtp->sk1u)
- sk = gtp->sk1u;
- else
- sk = NULL;
- break;
- default:
- return -ENOENT;
- }
-
- if (!sk) {
- netdev_dbg(dev, "no userspace socket is available, skip\n");
- return -ENOENT;
- }
-
- rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sk0,
- pctx->sgsn_addr_ip4.s_addr);
+ rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->sgsn_addr_ip4.s_addr);
if (IS_ERR(rt)) {
netdev_dbg(dev, "no route to SSGN %pI4\n",
&pctx->sgsn_addr_ip4.s_addr);
@@ -561,7 +534,7 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device
*dev,
goto err_rt;
}
- gtp_set_pktinfo_ipv4(pktinfo, sk, iph, pctx, rt, &fl4, dev);
+ gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
gtp_push_header(skb, pktinfo);
return 0;
@@ -916,7 +889,8 @@ static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info
*info)
}
}
-static int ipv4_pdp_add(struct gtp_dev *gtp, struct genl_info *info)
+static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk,
+ struct genl_info *info)
{
struct net_device *dev = gtp->dev;
u32 hash_ms, hash_tid = 0;
@@ -957,6 +931,8 @@ static int ipv4_pdp_add(struct gtp_dev *gtp, struct genl_info *info)
if (pctx == NULL)
return -ENOMEM;
+ sock_hold(sk);
+ pctx->sk = sk;
pctx->dev = gtp->dev;
ipv4_pdp_fill(pctx, info);
atomic_set(&pctx->tx_seq, 0);
@@ -994,16 +970,26 @@ static int ipv4_pdp_add(struct gtp_dev *gtp, struct genl_info
*info)
return 0;
}
+static void pdp_context_free(struct rcu_head *head)
+{
+ struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);
+
+ sock_put(pctx->sk);
+ kfree(pctx);
+}
+
static void pdp_context_delete(struct pdp_ctx *pctx)
{
hlist_del_rcu(&pctx->hlist_tid);
hlist_del_rcu(&pctx->hlist_addr);
- kfree_rcu(pctx, rcu_head);
+ call_rcu(&pctx->rcu_head, pdp_context_free);
}
static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
{
+ unsigned int version;
struct gtp_dev *gtp;
+ struct sock *sk;
int err;
if (!info->attrs[GTPA_VERSION] ||
@@ -1012,7 +998,9 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info
*info)
!info->attrs[GTPA_MS_ADDRESS])
return -EINVAL;
- switch (nla_get_u32(info->attrs[GTPA_VERSION])) {
+ version = nla_get_u32(info->attrs[GTPA_VERSION]);
+
+ switch (version) {
case GTP_V0:
if (!info->attrs[GTPA_TID] ||
!info->attrs[GTPA_FLOW])
@@ -1036,7 +1024,19 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info
*info)
goto out_unlock;
}
- err = ipv4_pdp_add(gtp, info);
+ if (version == GTP_V0)
+ sk = gtp->sk0;
+ else if (version == GTP_V1)
+ sk = gtp->sk1u;
+ else
+ sk = NULL;
+
+ if (!sk) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
+
+ err = ipv4_pdp_add(gtp, sk, info);
out_unlock:
rcu_read_unlock();
--
2.10.2