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Message-Id: <20171018201018.5692-10-tom@quantonium.net>
Date: Wed, 18 Oct 2017 13:10:15 -0700
From: Tom Herbert <tom@...ntonium.net>
To: davem@...emloft.net
Cc: pablo@...filter.org, laforge@...monks.org, aschultz@...p.net,
netdev@...r.kernel.org, rohit@...ntonium.net,
Tom Herbert <tom@...ntonium.net>
Subject: [PATCH v5 net-next 09/12] gtp: Eliminate pktinfo and add port configuration
The gtp pktinfo structure is unnecessary and needs a lot of code to
manage it. Remove it. Also, add per pdp port configuration for transmit.
Signed-off-by: Tom Herbert <tom@...ntonium.net>
---
drivers/net/gtp.c | 177 +++++++++++++++++++++--------------------------
include/uapi/linux/gtp.h | 1 +
2 files changed, 80 insertions(+), 98 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index bbb08f8849d3..44844eba8df2 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -54,6 +54,7 @@ struct pdp_ctx {
} u;
u8 gtp_version;
u8 hlen;
+ __be16 gtp_port;
u16 af;
struct in_addr ms_addr_ip4;
@@ -420,73 +421,36 @@ static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
*/
}
-struct gtp_pktinfo {
- struct sock *sk;
- struct iphdr *iph;
- struct flowi4 fl4;
- struct rtable *rt;
- struct pdp_ctx *pctx;
- struct net_device *dev;
- __be16 gtph_port;
-};
-
-static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
+static void gtp_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
{
- switch (pktinfo->pctx->gtp_version) {
+ switch (pctx->gtp_version) {
case GTP_V0:
- pktinfo->gtph_port = htons(GTP0_PORT);
- gtp0_push_header(skb, pktinfo->pctx);
+ gtp0_push_header(skb, pctx);
break;
case GTP_V1:
- pktinfo->gtph_port = htons(GTP1U_PORT);
- gtp1_push_header(skb, pktinfo->pctx);
+ gtp1_push_header(skb, pctx);
break;
}
}
-static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
- struct sock *sk, struct iphdr *iph,
- struct pdp_ctx *pctx, struct rtable *rt,
- struct flowi4 *fl4,
- struct net_device *dev)
-{
- pktinfo->sk = sk;
- pktinfo->iph = iph;
- pktinfo->pctx = pctx;
- pktinfo->rt = rt;
- pktinfo->fl4 = *fl4;
- pktinfo->dev = dev;
-}
-
-static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
- struct gtp_pktinfo *pktinfo)
+static int gtp_xmit(struct sk_buff *skb, struct net_device *dev,
+ struct pdp_ctx *pctx)
{
- struct gtp_dev *gtp = netdev_priv(dev);
- struct pdp_ctx *pctx;
+ struct iphdr *inner_iph = NULL;
+ struct sock *sk = pctx->sk;
+ __be32 saddr = inet_sk(sk)->inet_saddr;
struct rtable *rt;
- struct flowi4 fl4;
- struct iphdr *iph;
- struct sock *sk;
- __be32 saddr;
+ int err = 0;
- /* Read the IP destination address and resolve the PDP context.
- * Prepend PDP header with TEI/TID from PDP ctx.
- */
- iph = ip_hdr(skb);
- if (gtp->role == GTP_ROLE_SGSN)
- pctx = ipv4_pdp_find(gtp, iph->saddr);
- else
- pctx = ipv4_pdp_find(gtp, iph->daddr);
+ if (skb->protocol == ETH_P_IP)
+ inner_iph = ip_hdr(skb);
- if (!pctx) {
- netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
- &iph->daddr);
- return -ENOENT;
- }
- netdev_dbg(dev, "found PDP context %p\n", pctx);
+ /* Ensure there is sufficient headroom. */
+ err = skb_cow_head(skb, dev->needed_headroom);
+ if (unlikely(err))
+ goto out_err;
- sk = pctx->sk;
- saddr = inet_sk(sk)->inet_saddr;
+ skb_reset_inner_headers(skb);
/* Source address returned by route lookup is ignored since
* we get the address from a socket.
@@ -494,81 +458,89 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
rt = ip_tunnel_get_route(dev, skb, sk->sk_protocol,
sk->sk_bound_dev_if, RT_CONN_FLAGS(sk),
pctx->peer_addr_ip4.s_addr, &saddr,
- pktinfo->gtph_port, pktinfo->gtph_port,
+ pctx->gtp_port, pctx->gtp_port,
&pctx->dst_cache, NULL);
if (IS_ERR(rt)) {
- if (rt == ERR_PTR(-ELOOP)) {
- netdev_dbg(dev, "circular route to SSGN %pI4\n",
- &pctx->peer_addr_ip4.s_addr);
- dev->stats.collisions++;
- goto err_rt;
- } else {
- netdev_dbg(dev, "no route to SSGN %pI4\n",
- &pctx->peer_addr_ip4.s_addr);
- dev->stats.tx_carrier_errors++;
- goto err;
- }
+ err = PTR_ERR(rt);
+ goto out_err;
}
skb_dst_drop(skb);
- gtp_set_pktinfo_ipv4(pktinfo, sk, iph, pctx, rt, &fl4, dev);
- gtp_push_header(skb, pktinfo);
+ gtp_push_header(skb, pctx);
+
+ if (inner_iph)
+ __iptunnel_update_pmtu(dev, skb, &rt->dst,
+ !!inner_iph->frag_off,
+ inner_iph, pctx->hlen,
+ pctx->peer_addr_ip4.s_addr);
- __iptunnel_update_pmtu(dev, skb, &rt->dst, !!iph->frag_off, iph,
- pctx->hlen, pctx->peer_addr_ip4.s_addr);
+ udp_tunnel_xmit_skb(rt, sk, skb, saddr,
+ pctx->peer_addr_ip4.s_addr,
+ 0, ip4_dst_hoplimit(&rt->dst), 0,
+ pctx->gtp_port, pctx->gtp_port,
+ false, false);
+
+ netdev_dbg(dev, "gtp -> IP src: %pI4 dst: %pI4\n",
+ &saddr, &pctx->peer_addr_ip4.s_addr);
return 0;
-err_rt:
- ip_rt_put(rt);
-err:
- return -EBADMSG;
+
+out_err:
+ if (err == -ELOOP)
+ dev->stats.collisions++;
+ else
+ dev->stats.tx_carrier_errors++;
+
+ return err;
}
static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned int proto = ntohs(skb->protocol);
- struct gtp_pktinfo pktinfo;
+ struct gtp_dev *gtp = netdev_priv(dev);
+ struct pdp_ctx *pctx;
int err;
- /* Ensure there is sufficient headroom. */
- if (skb_cow_head(skb, dev->needed_headroom))
- goto tx_err;
-
- skb_reset_inner_headers(skb);
-
/* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */
rcu_read_lock();
switch (proto) {
- case ETH_P_IP:
- err = gtp_build_skb_ip4(skb, dev, &pktinfo);
+ case ETH_P_IP: {
+ struct iphdr *iph = ip_hdr(skb);
+
+ if (gtp->role == GTP_ROLE_SGSN)
+ pctx = ipv4_pdp_find(gtp, iph->saddr);
+ else
+ pctx = ipv4_pdp_find(gtp, iph->daddr);
+
+ if (!pctx) {
+ netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
+ &iph->daddr);
+ err = -ENOENT;
+ goto tx_err;
+ }
+
break;
+ }
default:
err = -EOPNOTSUPP;
- break;
+ goto tx_err;
}
- rcu_read_unlock();
+
+ netdev_dbg(dev, "found PDP context %p\n", pctx);
+
+ err = gtp_xmit(skb, dev, pctx);
if (err < 0)
goto tx_err;
- switch (proto) {
- case ETH_P_IP:
- netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
- &pktinfo.iph->saddr, &pktinfo.iph->daddr);
- udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
- pktinfo.fl4.saddr, pktinfo.fl4.daddr,
- pktinfo.iph->tos,
- ip4_dst_hoplimit(&pktinfo.rt->dst),
- 0,
- pktinfo.gtph_port, pktinfo.gtph_port,
- true, false);
- break;
- }
+ rcu_read_unlock();
return NETDEV_TX_OK;
+
tx_err:
+ rcu_read_unlock();
dev->stats.tx_errors++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
@@ -874,6 +846,8 @@ static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
{
+ __be16 default_port = 0;
+
pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
pctx->af = AF_INET;
pctx->peer_addr_ip4.s_addr =
@@ -890,15 +864,22 @@ static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]);
pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]);
pctx->hlen = sizeof(struct udphdr) + sizeof(struct gtp0_header);
+ default_port = htons(GTP0_PORT);
break;
case GTP_V1:
pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]);
pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]);
pctx->hlen = sizeof(struct udphdr) + sizeof(struct gtp1_header);
+ default_port = htons(GTP1U_PORT);
break;
default:
break;
}
+
+ if (info->attrs[GTPA_PORT])
+ pctx->gtp_port = nla_get_u16(info->attrs[GTPA_PORT]);
+ else
+ pctx->gtp_port = default_port;
}
static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk,
diff --git a/include/uapi/linux/gtp.h b/include/uapi/linux/gtp.h
index 57d1edb8efd9..b2283a5c6d7f 100644
--- a/include/uapi/linux/gtp.h
+++ b/include/uapi/linux/gtp.h
@@ -27,6 +27,7 @@ enum gtp_attrs {
GTPA_I_TEI, /* for GTPv1 only */
GTPA_O_TEI, /* for GTPv1 only */
GTPA_PAD,
+ GTPA_PORT,
__GTPA_MAX,
};
#define GTPA_MAX (__GTPA_MAX + 1)
--
2.11.0
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