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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 <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Felix Fietkau 2021-03-24 02:30:36 +01:00 committed by David S. Miller
parent bcf2766b13
commit f6efc675c9
4 changed files with 50 additions and 0 deletions
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22
drivers/net/ppp/ppp_generic.c
View File

@ -1560,12 +1560,34 @@ static void ppp_dev_priv_destructor(struct net_device *dev)
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 = {

23
drivers/net/ppp/pppoe.c
View File

@ -972,8 +972,31 @@ static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
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,

2
include/linux/netdevice.h
View File

@ -852,6 +852,7 @@ enum net_device_path_type {
DEV_PATH_ETHERNET = 0,
DEV_PATH_VLAN,
DEV_PATH_BRIDGE,
DEV_PATH_PPPOE,
};
struct net_device_path {
@ -861,6 +862,7 @@ struct net_device_path {
struct {
u16 id;
__be16 proto;
u8 h_dest[ETH_ALEN];
} encap;
struct {
enum {

3
include/linux/ppp_channel.h
View File

@ -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 {