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net: fix dev_fill_forward_path with pppoe + bridge 

[ Upstream commit cf2df74e20 ]

When calling dev_fill_forward_path on a pppoe device, the provided destination
address is invalid. In order for the bridge fdb lookup to succeed, the pppoe
code needs to update ctx->daddr to the correct value.
Fix this by storing the address inside struct net_device_path_ctx

Fixes: f6efc675c9 ("net: ppp: resolve forwarding path for bridge pppoe devices")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Felix Fietkau 2022-05-09 14:26:15 +02:00 committed by Greg Kroah-Hartman
parent 64e7b7fcf1
commit 4f988f405e
3 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ppp/pppoe.c
View File

@ -988,6 +988,7 @@ static int pppoe_fill_forward_path(struct net_device_path_ctx *ctx,
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);
memcpy(ctx->daddr, po->pppoe_pa.remote, ETH_ALEN);
path->dev = ctx->dev;
ctx->dev = dev;

2
include/linux/netdevice.h
View File

@ -891,7 +891,7 @@ struct net_device_path_stack {
struct net_device_path_ctx {
const struct net_device *dev;
const u8 *daddr;
u8 daddr[ETH_ALEN];
int num_vlans;
struct {

2
net/core/dev.c
View File

@ -663,11 +663,11 @@ int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
const struct net_device *last_dev;
struct net_device_path_ctx ctx = {
.dev = dev,
.daddr = daddr,
};
struct net_device_path *path;
int ret = 0;
memcpy(ctx.daddr, daddr, sizeof(ctx.daddr));
stack->num_paths = 0;
while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) {
last_dev = ctx.dev;