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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Michal Ostrowski , Dianne Skoll , Paul Mackerras , Jaco Kroon , James Carlson , Arnd Bergmann , Guillaume Nault Subject: [PATCH RFC net-next v2] pppoe: remove kernel-mode relay support Date: Fri, 13 Feb 2026 17:16:04 +0800 Message-ID: <20260213091605.132561-1-dqfext@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The kernel-mode PPPoE relay feature and its two associated ioctls (PPPOEIOCSFWD and PPPOEIOCDFWD) are not used by any existing userspace PPPoE implementations. The most commonly-used package, RP-PPPoE [1], handles the relaying entirely in userspace. This legacy code has remained in the driver since its introduction in kernel 2.3.99-pre7 for over two decades, but has served no practical purpose. Remove the unused relay code. [1] https://dianne.skoll.ca/projects/rp-pppoe/ Signed-off-by: Qingfang Deng Acked-by: Arnd Bergmann Reviewed-by: Guillaume Nault --- v1: restore .compat_ioctl https://lore.kernel.org/linux-ppp/20260211075547.138904-1-dqfext@gmail.co= m/ drivers/net/ppp/pppoe.c | 79 ----------------------------------- drivers/net/ppp/pppox.c | 3 -- include/linux/if_pppox.h | 6 --- include/uapi/linux/if_pppox.h | 10 ----- 4 files changed, 98 deletions(-) diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c index 4275b393a454..7a6dcfa421e9 100644 --- a/drivers/net/ppp/pppoe.c +++ b/drivers/net/ppp/pppoe.c @@ -237,25 +237,6 @@ static inline struct pppox_sock *get_item(struct pppoe= _net *pn, __be16 sid, return po; } =20 -static inline struct pppox_sock *__get_item_by_addr(struct net *net, - struct sockaddr_pppox *sp) -{ - struct net_device *dev; - struct pppoe_net *pn; - struct pppox_sock *pppox_sock =3D NULL; - - int ifindex; - - dev =3D dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev); - if (dev) { - ifindex =3D dev->ifindex; - pn =3D pppoe_pernet(net); - pppox_sock =3D __get_item(pn, sp->sa_addr.pppoe.sid, - sp->sa_addr.pppoe.remote, ifindex); - } - return pppox_sock; -} - static inline void delete_item(struct pppoe_net *pn, __be16 sid, char *addr, int ifindex) { @@ -369,7 +350,6 @@ static struct notifier_block pppoe_notifier =3D { static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) { struct pppox_sock *po =3D pppox_sk(sk); - struct pppox_sock *relay_po; =20 /* Backlog receive. Semantics of backlog rcv preclude any code from * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state @@ -378,17 +358,6 @@ static int pppoe_rcv_core(struct sock *sk, struct sk_b= uff *skb) =20 if (sk->sk_state & PPPOX_BOUND) { ppp_input(&po->chan, skb); - } else if (sk->sk_state & PPPOX_RELAY) { - relay_po =3D __get_item_by_addr(sock_net(sk), - &po->pppoe_relay); - if (relay_po =3D=3D NULL) - goto abort_kfree; - - if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) =3D=3D 0) - goto abort_kfree; - - if (!__pppoe_xmit(sk_pppox(relay_po), skb)) - goto abort_kfree; } else { if (sock_queue_rcv_skb(sk, skb)) goto abort_kfree; @@ -656,7 +625,6 @@ static int pppoe_connect(struct socket *sock, struct so= ckaddr_unsized *uservaddr =20 po->pppoe_ifindex =3D 0; memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa)); - memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay)); memset(&po->chan, 0, sizeof(po->chan)); po->next =3D NULL; po->num =3D 0; @@ -783,53 +751,6 @@ static int pppoe_ioctl(struct socket *sock, unsigned i= nt cmd, err =3D 0; break; =20 - case PPPOEIOCSFWD: - { - struct pppox_sock *relay_po; - - err =3D -EBUSY; - if (sk->sk_state & (PPPOX_BOUND | PPPOX_DEAD)) - break; - - err =3D -ENOTCONN; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - /* PPPoE address from the user specifies an outbound - PPPoE address which frames are forwarded to */ - err =3D -EFAULT; - if (copy_from_user(&po->pppoe_relay, - (void __user *)arg, - sizeof(struct sockaddr_pppox))) - break; - - err =3D -EINVAL; - if (po->pppoe_relay.sa_family !=3D AF_PPPOX || - po->pppoe_relay.sa_protocol !=3D PX_PROTO_OE) - break; - - /* Check that the socket referenced by the address - actually exists. */ - rcu_read_lock(); - relay_po =3D __get_item_by_addr(sock_net(sk), &po->pppoe_relay); - rcu_read_unlock(); - if (!relay_po) - break; - - sk->sk_state |=3D PPPOX_RELAY; - err =3D 0; - break; - } - - case PPPOEIOCDFWD: - err =3D -EALREADY; - if (!(sk->sk_state & PPPOX_RELAY)) - break; - - sk->sk_state &=3D ~PPPOX_RELAY; - err =3D 0; - break; - default: err =3D -ENOTTY; } diff --git a/drivers/net/ppp/pppox.c b/drivers/net/ppp/pppox.c index 08364f10a43f..5861a2f6ce3e 100644 --- a/drivers/net/ppp/pppox.c +++ b/drivers/net/ppp/pppox.c @@ -102,9 +102,6 @@ EXPORT_SYMBOL(pppox_ioctl); #ifdef CONFIG_COMPAT int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned lon= g arg) { - if (cmd =3D=3D PPPOEIOCSFWD32) - cmd =3D PPPOEIOCSFWD; - return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); } =20 diff --git a/include/linux/if_pppox.h b/include/linux/if_pppox.h index db45d6f1c4f4..8bbf676c2a85 100644 --- a/include/linux/if_pppox.h +++ b/include/linux/if_pppox.h @@ -25,8 +25,6 @@ struct pppoe_opt { struct net_device *dev; /* device associated with socket*/ int ifindex; /* ifindex of device associated with socket */ struct pppoe_addr pa; /* what this socket is bound to*/ - struct sockaddr_pppox relay; /* what socket data will be - relayed to (PPPoE relaying) */ struct work_struct padt_work;/* Work item for handling PADT */ }; =20 @@ -53,7 +51,6 @@ struct pppox_sock { #define pppoe_dev proto.pppoe.dev #define pppoe_ifindex proto.pppoe.ifindex #define pppoe_pa proto.pppoe.pa -#define pppoe_relay proto.pppoe.relay =20 static inline struct pppox_sock *pppox_sk(struct sock *sk) { @@ -80,14 +77,11 @@ extern void pppox_unbind_sock(struct sock *sk);/* delet= e ppp-channel binding */ extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned lon= g arg); extern int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsig= ned long arg); =20 -#define PPPOEIOCSFWD32 _IOW(0xB1 ,0, compat_size_t) - /* PPPoX socket states */ enum { PPPOX_NONE =3D 0, /* initial state */ PPPOX_CONNECTED =3D 1, /* connection established =3D=3DTCP_ESTABLISHE= D */ PPPOX_BOUND =3D 2, /* bound to ppp device */ - PPPOX_RELAY =3D 4, /* forwarding is enabled */ PPPOX_DEAD =3D 16 /* dead, useless, please clean me up!*/ }; =20 diff --git a/include/uapi/linux/if_pppox.h b/include/uapi/linux/if_pppox.h index 9abd80dcc46f..8fdf0a681a4e 100644 --- a/include/uapi/linux/if_pppox.h +++ b/include/uapi/linux/if_pppox.h @@ -103,16 +103,6 @@ struct sockaddr_pppol2tpv3in6 { struct pppol2tpv3in6_addr pppol2tp; } __packed; =20 -/********************************************************************* - * - * ioctl interface for defining forwarding of connections - * - ********************************************************************/ - -#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t) -#define PPPOEIOCDFWD _IO(0xB1 ,1) -/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/ - /* Codes to identify message types */ #define PADI_CODE 0x09 #define PADO_CODE 0x07 --=20 2.43.0