From: Felix Fietkau Date: Wed, 24 Mar 2021 02:30:36 +0100 Subject: [PATCH] net: ppp: resolve forwarding path for bridge pppoe devices Pass on the PPPoE session ID, destination hardware address and the real device. Signed-off-by: Felix Fietkau Signed-off-by: Pablo Neira Ayuso --- --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -1461,12 +1461,34 @@ static void ppp_dev_priv_destructor(stru ppp_destroy_interface(ppp); } +static int ppp_fill_forward_path(struct net_device_path_ctx *ctx, + struct net_device_path *path) +{ + struct ppp *ppp = netdev_priv(ctx->dev); + struct ppp_channel *chan; + struct channel *pch; + + if (ppp->flags & SC_MULTILINK) + return -EOPNOTSUPP; + + if (list_empty(&ppp->channels)) + return -ENODEV; + + pch = list_first_entry(&ppp->channels, struct channel, clist); + chan = pch->chan; + if (!chan->ops->fill_forward_path) + return -EOPNOTSUPP; + + return chan->ops->fill_forward_path(ctx, path, chan); +} + static const struct net_device_ops ppp_netdev_ops = { .ndo_init = ppp_dev_init, .ndo_uninit = ppp_dev_uninit, .ndo_start_xmit = ppp_start_xmit, .ndo_do_ioctl = ppp_net_ioctl, .ndo_get_stats64 = ppp_get_stats64, + .ndo_fill_forward_path = ppp_fill_forward_path, }; static struct device_type ppp_type = { --- a/drivers/net/ppp/pppoe.c +++ b/drivers/net/ppp/pppoe.c @@ -972,8 +972,31 @@ static int pppoe_xmit(struct ppp_channel return __pppoe_xmit(sk, skb); } +static int pppoe_fill_forward_path(struct net_device_path_ctx *ctx, + struct net_device_path *path, + const struct ppp_channel *chan) +{ + struct sock *sk = (struct sock *)chan->private; + struct pppox_sock *po = pppox_sk(sk); + struct net_device *dev = po->pppoe_dev; + + if (sock_flag(sk, SOCK_DEAD) || + !(sk->sk_state & PPPOX_CONNECTED) || !dev) + return -1; + + path->type = DEV_PATH_PPPOE; + path->encap.proto = htons(ETH_P_PPP_SES); + path->encap.id = be16_to_cpu(po->num); + memcpy(path->encap.h_dest, po->pppoe_pa.remote, ETH_ALEN); + path->dev = ctx->dev; + ctx->dev = dev; + + return 0; +} + static const struct ppp_channel_ops pppoe_chan_ops = { .start_xmit = pppoe_xmit, + .fill_forward_path = pppoe_fill_forward_path, }; static int pppoe_recvmsg(struct socket *sock, struct msghdr *m, --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -831,6 +831,7 @@ enum net_device_path_type { DEV_PATH_ETHERNET = 0, DEV_PATH_VLAN, DEV_PATH_BRIDGE, + DEV_PATH_PPPOE, }; struct net_device_path { @@ -840,6 +841,7 @@ struct net_device_path { struct { u16 id; __be16 proto; + u8 h_dest[ETH_ALEN]; } encap; struct { enum { --- a/include/linux/ppp_channel.h +++ b/include/linux/ppp_channel.h @@ -28,6 +28,9 @@ struct ppp_channel_ops { int (*start_xmit)(struct ppp_channel *, struct sk_buff *); /* Handle an ioctl call that has come in via /dev/ppp. */ int (*ioctl)(struct ppp_channel *, unsigned int, unsigned long); + int (*fill_forward_path)(struct net_device_path_ctx *, + struct net_device_path *, + const struct ppp_channel *); }; struct ppp_channel {