168 lines
4.6 KiB
Diff
168 lines
4.6 KiB
Diff
From ffe387740bbe88dd88bbe04d6375902708003d6e Mon Sep 17 00:00:00 2001
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 7 Jul 2017 17:25:00 +0200
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Subject: net: add packet mangeling
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ar8216 switches have a hardware bug, which renders normal 802.1q support
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unusable. Packet mangling is required to fix up the vlan for incoming
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packets.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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include/linux/netdevice.h | 11 +++++++++++
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include/linux/skbuff.h | 14 ++++----------
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net/Kconfig | 6 ++++++
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net/core/dev.c | 20 +++++++++++++++-----
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net/core/skbuff.c | 17 +++++++++++++++++
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net/ethernet/eth.c | 6 ++++++
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6 files changed, 59 insertions(+), 15 deletions(-)
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--- a/include/linux/netdevice.h
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+++ b/include/linux/netdevice.h
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@@ -1704,6 +1704,7 @@ enum netdev_priv_flags {
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IFF_LIVE_RENAME_OK = 1<<30,
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IFF_TX_SKB_NO_LINEAR = BIT_ULL(31),
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IFF_CHANGE_PROTO_DOWN = BIT_ULL(32),
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+ IFF_NO_IP_ALIGN = BIT_ULL(33),
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};
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#define IFF_802_1Q_VLAN IFF_802_1Q_VLAN
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@@ -1738,6 +1739,7 @@ enum netdev_priv_flags {
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#define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER
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#define IFF_LIVE_RENAME_OK IFF_LIVE_RENAME_OK
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#define IFF_TX_SKB_NO_LINEAR IFF_TX_SKB_NO_LINEAR
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+#define IFF_NO_IP_ALIGN IFF_NO_IP_ALIGN
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/* Specifies the type of the struct net_device::ml_priv pointer */
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enum netdev_ml_priv_type {
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@@ -2106,6 +2108,11 @@ struct net_device {
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const struct tlsdev_ops *tlsdev_ops;
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#endif
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ void (*eth_mangle_rx)(struct net_device *dev, struct sk_buff *skb);
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+ struct sk_buff *(*eth_mangle_tx)(struct net_device *dev, struct sk_buff *skb);
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+#endif
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+
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const struct header_ops *header_ops;
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unsigned char operstate;
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@@ -2181,6 +2188,10 @@ struct net_device {
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struct mctp_dev __rcu *mctp_ptr;
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#endif
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ void *phy_ptr; /* PHY device specific data */
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+#endif
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+
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/*
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* Cache lines mostly used on receive path (including eth_type_trans())
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*/
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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -3032,6 +3032,10 @@ static inline int pskb_trim(struct sk_bu
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return (len < skb->len) ? __pskb_trim(skb, len) : 0;
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}
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+extern struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
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+ unsigned int length, gfp_t gfp);
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+
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+
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/**
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* pskb_trim_unique - remove end from a paged unique (not cloned) buffer
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* @skb: buffer to alter
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@@ -3181,16 +3185,6 @@ static inline struct sk_buff *dev_alloc_
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}
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-static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
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- unsigned int length, gfp_t gfp)
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-{
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- struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
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-
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- if (NET_IP_ALIGN && skb)
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- skb_reserve(skb, NET_IP_ALIGN);
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- return skb;
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-}
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-
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static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
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unsigned int length)
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{
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -26,6 +26,12 @@ menuconfig NET
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if NET
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+config ETHERNET_PACKET_MANGLE
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+ bool
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+ help
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+ This option can be selected by phy drivers that need to mangle
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+ packets going in or out of an ethernet device.
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+
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config WANT_COMPAT_NETLINK_MESSAGES
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bool
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help
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -3590,6 +3590,11 @@ static int xmit_one(struct sk_buff *skb,
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if (dev_nit_active(dev))
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dev_queue_xmit_nit(skb, dev);
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ if (dev->eth_mangle_tx && !(skb = dev->eth_mangle_tx(dev, skb)))
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+ return NETDEV_TX_OK;
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+#endif
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+
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len = skb->len;
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trace_net_dev_start_xmit(skb, dev);
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rc = netdev_start_xmit(skb, dev, txq, more);
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--- a/net/core/skbuff.c
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+++ b/net/core/skbuff.c
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@@ -61,6 +61,7 @@
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#include <linux/if_vlan.h>
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#include <linux/mpls.h>
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#include <linux/kcov.h>
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+#include <linux/if.h>
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#include <net/protocol.h>
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#include <net/dst.h>
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@@ -707,6 +708,22 @@ skb_fail:
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}
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EXPORT_SYMBOL(__napi_alloc_skb);
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+struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
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+ unsigned int length, gfp_t gfp)
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+{
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+ struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
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+
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ if (dev && (dev->priv_flags & IFF_NO_IP_ALIGN))
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+ return skb;
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+#endif
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+
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+ if (NET_IP_ALIGN && skb)
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+ skb_reserve(skb, NET_IP_ALIGN);
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+ return skb;
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+}
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+EXPORT_SYMBOL(__netdev_alloc_skb_ip_align);
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+
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void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
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int size, unsigned int truesize)
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{
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--- a/net/ethernet/eth.c
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+++ b/net/ethernet/eth.c
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@@ -171,6 +171,12 @@ __be16 eth_type_trans(struct sk_buff *sk
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const struct ethhdr *eth;
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skb->dev = dev;
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+
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ if (dev->eth_mangle_rx)
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+ dev->eth_mangle_rx(dev, skb);
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+#endif
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+
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skb_reset_mac_header(skb);
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eth = (struct ethhdr *)skb->data;
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