target/linux/generic/backport-5.10/610-v5.13-15-net-ppp-resolve-forwarding-path-for-bridge-pppoe-dev.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 24 Mar 2021 02:30:36 +0100
   3 Subject: [PATCH] net: ppp: resolve forwarding path for bridge pppoe
   4  devices
   5
   6 Pass on the PPPoE session ID, destination hardware address and the real
   7 device.
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
  11 ---
  12
  13 --- a/drivers/net/ppp/ppp_generic.c
  14 +++ b/drivers/net/ppp/ppp_generic.c
  15 @@ -1466,12 +1466,34 @@ static void ppp_dev_priv_destructor(stru
  16                 ppp_destroy_interface(ppp);
  17  }
  18
  19 +static int ppp_fill_forward_path(struct net_device_path_ctx *ctx,
  20 +                                struct net_device_path *path)
  21 +{
  22 +       struct ppp *ppp = netdev_priv(ctx->dev);
  23 +       struct ppp_channel *chan;
  24 +       struct channel *pch;
  25 +
  26 +       if (ppp->flags & SC_MULTILINK)
  27 +               return -EOPNOTSUPP;
  28 +
  29 +       if (list_empty(&ppp->channels))
  30 +               return -ENODEV;
  31 +
  32 +       pch = list_first_entry(&ppp->channels, struct channel, clist);
  33 +       chan = pch->chan;
  34 +       if (!chan->ops->fill_forward_path)
  35 +               return -EOPNOTSUPP;
  36 +
  37 +       return chan->ops->fill_forward_path(ctx, path, chan);
  38 +}
  39 +
  40  static const struct net_device_ops ppp_netdev_ops = {
  41         .ndo_init        = ppp_dev_init,
  42         .ndo_uninit      = ppp_dev_uninit,
  43         .ndo_start_xmit  = ppp_start_xmit,
  44         .ndo_do_ioctl    = ppp_net_ioctl,
  45         .ndo_get_stats64 = ppp_get_stats64,
  46 +       .ndo_fill_forward_path = ppp_fill_forward_path,
  47  };
  48
  49  static struct device_type ppp_type = {
  50 --- a/drivers/net/ppp/pppoe.c
  51 +++ b/drivers/net/ppp/pppoe.c
  52 @@ -972,8 +972,31 @@ static int pppoe_xmit(struct ppp_channel
  53         return __pppoe_xmit(sk, skb);
  54  }
  55
  56 +static int pppoe_fill_forward_path(struct net_device_path_ctx *ctx,
  57 +                                  struct net_device_path *path,
  58 +                                  const struct ppp_channel *chan)
  59 +{
  60 +       struct sock *sk = (struct sock *)chan->private;
  61 +       struct pppox_sock *po = pppox_sk(sk);
  62 +       struct net_device *dev = po->pppoe_dev;
  63 +
  64 +       if (sock_flag(sk, SOCK_DEAD) ||
  65 +           !(sk->sk_state & PPPOX_CONNECTED) || !dev)
  66 +               return -1;
  67 +
  68 +       path->type = DEV_PATH_PPPOE;
  69 +       path->encap.proto = htons(ETH_P_PPP_SES);
  70 +       path->encap.id = be16_to_cpu(po->num);
  71 +       memcpy(path->encap.h_dest, po->pppoe_pa.remote, ETH_ALEN);
  72 +       path->dev = ctx->dev;
  73 +       ctx->dev = dev;
  74 +
  75 +       return 0;
  76 +}
  77 +
  78  static const struct ppp_channel_ops pppoe_chan_ops = {
  79         .start_xmit = pppoe_xmit,
  80 +       .fill_forward_path = pppoe_fill_forward_path,
  81  };
  82
  83  static int pppoe_recvmsg(struct socket *sock, struct msghdr *m,
  84 --- a/include/linux/netdevice.h
  85 +++ b/include/linux/netdevice.h
  86 @@ -831,6 +831,7 @@ enum net_device_path_type {
  87         DEV_PATH_ETHERNET = 0,
  88         DEV_PATH_VLAN,
  89         DEV_PATH_BRIDGE,
  90 +       DEV_PATH_PPPOE,
  91  };
  92
  93  struct net_device_path {
  94 @@ -840,6 +841,7 @@ struct net_device_path {
  95                 struct {
  96                         u16             id;
  97                         __be16          proto;
  98 +                       u8              h_dest[ETH_ALEN];
  99                 } encap;
 100                 struct {
 101                         enum {
 102 --- a/include/linux/ppp_channel.h
 103 +++ b/include/linux/ppp_channel.h
 104 @@ -28,6 +28,9 @@ struct ppp_channel_ops {
 105         int     (*start_xmit)(struct ppp_channel *, struct sk_buff *);
 106         /* Handle an ioctl call that has come in via /dev/ppp. */
 107         int     (*ioctl)(struct ppp_channel *, unsigned int, unsigned long);
 108 +       int     (*fill_forward_path)(struct net_device_path_ctx *,
 109 +                                    struct net_device_path *,
 110 +                                    const struct ppp_channel *);
 111  };
 112
 113  struct ppp_channel {