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gtp: switch from struct socket to struct sock for the GTP sockets

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After enabling the UDP encapsulation, only the sk member is used.

Holding the socket would prevent user space from closing the socket,
but holding a reference to the sk member does not have the same
effect.

This change will make it simpler to later detach the sockets from
the netdevice.

Signed-off-by: Andreas Schultz <aschultz@tpip.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Schultz 2017-03-09 17:42:56 +01:00 committed by David S. Miller
parent 68e5cfaffa
commit 17886c4705
1 changed files with 23 additions and 19 deletions
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42
drivers/net/gtp.c
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@ -66,8 +66,8 @@ struct pdp_ctx {
struct gtp_dev {
struct list_head list;
struct socket *sock0;
struct socket *sock1u;
struct sock *sk0;
struct sock *sk1u;
struct net_device *dev;
@ -261,17 +261,19 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
static void gtp_encap_disable(struct gtp_dev *gtp)
{
if (gtp->sock0 && gtp->sock0->sk) {
udp_sk(gtp->sock0->sk)->encap_type = 0;
rcu_assign_sk_user_data(gtp->sock0->sk, NULL);
if (gtp->sk0) {
udp_sk(gtp->sk0)->encap_type = 0;
rcu_assign_sk_user_data(gtp->sk0, NULL);
sock_put(gtp->sk0);
}
if (gtp->sock1u && gtp->sock1u->sk) {
udp_sk(gtp->sock1u->sk)->encap_type = 0;
rcu_assign_sk_user_data(gtp->sock1u->sk, NULL);
if (gtp->sk1u) {
udp_sk(gtp->sk1u)->encap_type = 0;
rcu_assign_sk_user_data(gtp->sk1u, NULL);
sock_put(gtp->sk1u);
}
gtp->sock0 = NULL;
gtp->sock1u = NULL;
gtp->sk0 = NULL;
gtp->sk1u = NULL;
}
static void gtp_encap_destroy(struct sock *sk)
@ -484,14 +486,14 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
switch (pctx->gtp_version) {
case GTP_V0:
if (gtp->sock0)
sk = gtp->sock0->sk;
if (gtp->sk0)
sk = gtp->sk0;
else
sk = NULL;
break;
case GTP_V1:
if (gtp->sock1u)
sk = gtp->sock1u->sk;
if (gtp->sk1u)
sk = gtp->sk1u;
else
sk = NULL;
break;
@ -504,7 +506,7 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
return -ENOENT;
}
rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sock0->sk,
rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sk0,
pctx->sgsn_addr_ip4.s_addr);
if (IS_ERR(rt)) {
netdev_dbg(dev, "no route to SSGN %pI4\n",
@ -839,18 +841,20 @@ static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp,
netdev_dbg(dev, "enable gtp on %p, %p\n", sock0, sock1u);
gtp->sock0 = sock0;
gtp->sock1u = sock1u;
sock_hold(sock0->sk);
gtp->sk0 = sock0->sk;
sock_hold(sock1u->sk);
gtp->sk1u = sock1u->sk;
tuncfg.sk_user_data = gtp;
tuncfg.encap_rcv = gtp_encap_recv;
tuncfg.encap_destroy = gtp_encap_destroy;
tuncfg.encap_type = UDP_ENCAP_GTP0;
setup_udp_tunnel_sock(sock_net(gtp->sock0->sk), gtp->sock0, &tuncfg);
setup_udp_tunnel_sock(sock_net(gtp->sk0), sock0, &tuncfg);
tuncfg.encap_type = UDP_ENCAP_GTP1U;
setup_udp_tunnel_sock(sock_net(gtp->sock1u->sk), gtp->sock1u, &tuncfg);
setup_udp_tunnel_sock(sock_net(gtp->sk1u), sock1u, &tuncfg);
err = 0;
err2: