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Date: Tue, 21 Feb 2017 11:18:53 +0100
From: Andreas Schultz <aschultz@...p.net>
To: Pablo Neira <pablo@...filter.org>
Cc: netdev@...r.kernel.org, Harald Welte <laforge@...monks.org>,
osmocom-net-gprs@...ts.osmocom.org
Subject: [PATCH net-next v4 5/7] gtp: unify genl_find_pdp and prepare for per socket lookup
This unifies duplicate code into a helper. It also prepares the
groundwork to add a lookup version that uses the socket to find
attached pdp contexts.
Signed-off-by: Andreas Schultz <aschultz@...p.net>
---
drivers/net/gtp.c | 121 ++++++++++++++++++++++--------------------------------
1 file changed, 50 insertions(+), 71 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index fc0fff5..f529d1e 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1037,55 +1037,67 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
return err;
}
+static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
+ struct nlattr *nla[])
+{
+ struct gtp_dev *gtp;
+
+ gtp = gtp_find_dev(net, nla);
+ if (!gtp)
+ return ERR_PTR(-ENODEV);
+
+ if (nla[GTPA_MS_ADDRESS]) {
+ __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
+
+ return ipv4_pdp_find(gtp, ip);
+ } else if (nla[GTPA_VERSION]) {
+ u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]);
+
+ if (gtp_version == GTP_V0 && nla[GTPA_TID])
+ return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]));
+ else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI])
+ return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]));
+ }
+
+ return ERR_PTR(-EINVAL);
+}
+
+static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
+{
+ struct pdp_ctx *pctx;
+
+ if (nla[GTPA_LINK])
+ pctx = gtp_find_pdp_by_link(net, nla);
+ else
+ pctx = ERR_PTR(-EINVAL);
+
+ if (!pctx)
+ pctx = ERR_PTR(-ENOENT);
+
+ return pctx;
+}
+
static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
{
struct pdp_ctx *pctx;
- struct gtp_dev *gtp;
int err = 0;
- if (!info->attrs[GTPA_VERSION] ||
- !info->attrs[GTPA_LINK])
+ if (!info->attrs[GTPA_VERSION])
return -EINVAL;
rcu_read_lock();
- gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
- if (!gtp) {
- err = -ENODEV;
- goto out_unlock;
- }
-
- switch (nla_get_u32(info->attrs[GTPA_VERSION])) {
- case GTP_V0:
- if (!info->attrs[GTPA_TID]) {
- err = -EINVAL;
- goto out_unlock;
- }
- pctx = gtp0_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_TID]));
- break;
- case GTP_V1:
- if (!info->attrs[GTPA_I_TEI]) {
- err = -EINVAL;
- goto out_unlock;
- }
- pctx = gtp1_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_I_TEI]));
- break;
-
- default:
- err = -EINVAL;
- goto out_unlock;
- }
-
- if (!pctx) {
- err = -ENOENT;
+ pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
+ if (IS_ERR(pctx)) {
+ err = PTR_ERR(pctx);
goto out_unlock;
}
if (pctx->gtp_version == GTP_V0)
- netdev_dbg(gtp->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
+ netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
pctx->u.v0.tid, pctx);
else if (pctx->gtp_version == GTP_V1)
- netdev_dbg(gtp->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
+ netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
hlist_del_rcu(&pctx->hlist_tid);
@@ -1139,49 +1151,16 @@ static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
{
struct pdp_ctx *pctx = NULL;
struct sk_buff *skb2;
- struct gtp_dev *gtp;
- u32 gtp_version;
int err;
- if (!info->attrs[GTPA_VERSION] ||
- !info->attrs[GTPA_LINK])
+ if (!info->attrs[GTPA_VERSION])
return -EINVAL;
- gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
- switch (gtp_version) {
- case GTP_V0:
- case GTP_V1:
- break;
- default:
- return -EINVAL;
- }
-
rcu_read_lock();
- gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
- if (!gtp) {
- err = -ENODEV;
- goto err_unlock;
- }
-
- if (gtp_version == GTP_V0 &&
- info->attrs[GTPA_TID]) {
- u64 tid = nla_get_u64(info->attrs[GTPA_TID]);
-
- pctx = gtp0_pdp_find(gtp, tid);
- } else if (gtp_version == GTP_V1 &&
- info->attrs[GTPA_I_TEI]) {
- u32 tid = nla_get_u32(info->attrs[GTPA_I_TEI]);
-
- pctx = gtp1_pdp_find(gtp, tid);
- } else if (info->attrs[GTPA_MS_ADDRESS]) {
- __be32 ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
-
- pctx = ipv4_pdp_find(gtp, ip);
- }
-
- if (pctx == NULL) {
- err = -ENOENT;
+ pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
+ if (IS_ERR(pctx)) {
+ err = PTR_ERR(pctx);
goto err_unlock;
}
--
2.10.2
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