mirror of
https://github.com/torvalds/linux.git
synced 2025-12-07 20:06:24 +00:00
1bec9d0c00
Convert the ->flowic_tos field of struct flowi_common from __u8 to dscp_t, rename it ->flowic_dscp and propagate these changes to struct flowi and struct flowi4. We've had several bugs in the past where ECN bits could interfere with IPv4 routing, because these bits were not properly cleared when setting ->flowi4_tos. These bugs should be fixed now and the dscp_t type has been introduced to ensure that variables carrying DSCP values don't accidentally have any ECN bits set. Several variables and structure fields have been converted to dscp_t already, but the main IPv4 routing structure, struct flowi4, is still using a __u8. To avoid any future regression, this patch converts it to dscp_t. There are many users to convert at once. Fortunately, around half of ->flowi4_tos users already have a dscp_t value at hand, which they currently convert to __u8 using inet_dscp_to_dsfield(). For all of these users, we just need to drop that conversion. But, although we try to do the __u8 <-> dscp_t conversions at the boundaries of the network or of user space, some places still store TOS/DSCP variables as __u8 in core networking code. Those can hardly be converted either because the data structure is part of UAPI or because the same variable or field is also used for handling ECN in other parts of the code. In all of these cases where we don't have a dscp_t variable at hand, we need to use inet_dsfield_to_dscp() when interacting with ->flowi4_dscp. Changes since v1: * Fix space alignment in __bpf_redirect_neigh_v4() (Ido). Signed-off-by: Guillaume Nault <gnault@redhat.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/29acecb45e911d17446b9a3dbdb1ab7b821ea371.1756128932.git.gnault@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
199 lines
5.1 KiB
C
199 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
*
|
|
* Generic internet FLOW.
|
|
*
|
|
*/
|
|
|
|
#ifndef _NET_FLOW_H
|
|
#define _NET_FLOW_H
|
|
|
|
#include <linux/in6.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/container_of.h>
|
|
#include <linux/uidgid.h>
|
|
#include <net/inet_dscp.h>
|
|
|
|
struct flow_keys;
|
|
|
|
/*
|
|
* ifindex generation is per-net namespace, and loopback is
|
|
* always the 1st device in ns (see net_dev_init), thus any
|
|
* loopback device should get ifindex 1
|
|
*/
|
|
|
|
#define LOOPBACK_IFINDEX 1
|
|
|
|
struct flowi_tunnel {
|
|
__be64 tun_id;
|
|
};
|
|
|
|
struct flowi_common {
|
|
int flowic_oif;
|
|
int flowic_iif;
|
|
int flowic_l3mdev;
|
|
__u32 flowic_mark;
|
|
dscp_t flowic_dscp;
|
|
__u8 flowic_scope;
|
|
__u8 flowic_proto;
|
|
__u8 flowic_flags;
|
|
#define FLOWI_FLAG_ANYSRC 0x01
|
|
#define FLOWI_FLAG_KNOWN_NH 0x02
|
|
#define FLOWI_FLAG_L3MDEV_OIF 0x04
|
|
#define FLOWI_FLAG_ANY_SPORT 0x08
|
|
__u32 flowic_secid;
|
|
kuid_t flowic_uid;
|
|
__u32 flowic_multipath_hash;
|
|
struct flowi_tunnel flowic_tun_key;
|
|
};
|
|
|
|
union flowi_uli {
|
|
struct {
|
|
__be16 dport;
|
|
__be16 sport;
|
|
} ports;
|
|
|
|
struct {
|
|
__u8 type;
|
|
__u8 code;
|
|
} icmpt;
|
|
|
|
__be32 gre_key;
|
|
|
|
struct {
|
|
__u8 type;
|
|
} mht;
|
|
};
|
|
|
|
struct flowi4 {
|
|
struct flowi_common __fl_common;
|
|
#define flowi4_oif __fl_common.flowic_oif
|
|
#define flowi4_iif __fl_common.flowic_iif
|
|
#define flowi4_l3mdev __fl_common.flowic_l3mdev
|
|
#define flowi4_mark __fl_common.flowic_mark
|
|
#define flowi4_dscp __fl_common.flowic_dscp
|
|
#define flowi4_scope __fl_common.flowic_scope
|
|
#define flowi4_proto __fl_common.flowic_proto
|
|
#define flowi4_flags __fl_common.flowic_flags
|
|
#define flowi4_secid __fl_common.flowic_secid
|
|
#define flowi4_tun_key __fl_common.flowic_tun_key
|
|
#define flowi4_uid __fl_common.flowic_uid
|
|
#define flowi4_multipath_hash __fl_common.flowic_multipath_hash
|
|
|
|
/* (saddr,daddr) must be grouped, same order as in IP header */
|
|
__be32 saddr;
|
|
__be32 daddr;
|
|
|
|
union flowi_uli uli;
|
|
#define fl4_sport uli.ports.sport
|
|
#define fl4_dport uli.ports.dport
|
|
#define fl4_icmp_type uli.icmpt.type
|
|
#define fl4_icmp_code uli.icmpt.code
|
|
#define fl4_mh_type uli.mht.type
|
|
#define fl4_gre_key uli.gre_key
|
|
} __attribute__((__aligned__(BITS_PER_LONG/8)));
|
|
|
|
static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
|
|
__u32 mark, __u8 tos, __u8 scope,
|
|
__u8 proto, __u8 flags,
|
|
__be32 daddr, __be32 saddr,
|
|
__be16 dport, __be16 sport,
|
|
kuid_t uid)
|
|
{
|
|
fl4->flowi4_oif = oif;
|
|
fl4->flowi4_iif = LOOPBACK_IFINDEX;
|
|
fl4->flowi4_l3mdev = 0;
|
|
fl4->flowi4_mark = mark;
|
|
fl4->flowi4_dscp = inet_dsfield_to_dscp(tos);
|
|
fl4->flowi4_scope = scope;
|
|
fl4->flowi4_proto = proto;
|
|
fl4->flowi4_flags = flags;
|
|
fl4->flowi4_secid = 0;
|
|
fl4->flowi4_tun_key.tun_id = 0;
|
|
fl4->flowi4_uid = uid;
|
|
fl4->daddr = daddr;
|
|
fl4->saddr = saddr;
|
|
fl4->fl4_dport = dport;
|
|
fl4->fl4_sport = sport;
|
|
fl4->flowi4_multipath_hash = 0;
|
|
}
|
|
|
|
/* Reset some input parameters after previous lookup */
|
|
static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
|
|
__be32 daddr, __be32 saddr)
|
|
{
|
|
fl4->flowi4_oif = oif;
|
|
fl4->daddr = daddr;
|
|
fl4->saddr = saddr;
|
|
}
|
|
|
|
|
|
struct flowi6 {
|
|
struct flowi_common __fl_common;
|
|
#define flowi6_oif __fl_common.flowic_oif
|
|
#define flowi6_iif __fl_common.flowic_iif
|
|
#define flowi6_l3mdev __fl_common.flowic_l3mdev
|
|
#define flowi6_mark __fl_common.flowic_mark
|
|
#define flowi6_scope __fl_common.flowic_scope
|
|
#define flowi6_proto __fl_common.flowic_proto
|
|
#define flowi6_flags __fl_common.flowic_flags
|
|
#define flowi6_secid __fl_common.flowic_secid
|
|
#define flowi6_tun_key __fl_common.flowic_tun_key
|
|
#define flowi6_uid __fl_common.flowic_uid
|
|
struct in6_addr daddr;
|
|
struct in6_addr saddr;
|
|
/* Note: flowi6_dscp is encoded in flowlabel, too. */
|
|
__be32 flowlabel;
|
|
union flowi_uli uli;
|
|
#define fl6_sport uli.ports.sport
|
|
#define fl6_dport uli.ports.dport
|
|
#define fl6_icmp_type uli.icmpt.type
|
|
#define fl6_icmp_code uli.icmpt.code
|
|
#define fl6_mh_type uli.mht.type
|
|
#define fl6_gre_key uli.gre_key
|
|
__u32 mp_hash;
|
|
} __attribute__((__aligned__(BITS_PER_LONG/8)));
|
|
|
|
struct flowi {
|
|
union {
|
|
struct flowi_common __fl_common;
|
|
struct flowi4 ip4;
|
|
struct flowi6 ip6;
|
|
} u;
|
|
#define flowi_oif u.__fl_common.flowic_oif
|
|
#define flowi_iif u.__fl_common.flowic_iif
|
|
#define flowi_l3mdev u.__fl_common.flowic_l3mdev
|
|
#define flowi_mark u.__fl_common.flowic_mark
|
|
#define flowi_dscp u.__fl_common.flowic_dscp
|
|
#define flowi_scope u.__fl_common.flowic_scope
|
|
#define flowi_proto u.__fl_common.flowic_proto
|
|
#define flowi_flags u.__fl_common.flowic_flags
|
|
#define flowi_secid u.__fl_common.flowic_secid
|
|
#define flowi_tun_key u.__fl_common.flowic_tun_key
|
|
#define flowi_uid u.__fl_common.flowic_uid
|
|
} __attribute__((__aligned__(BITS_PER_LONG/8)));
|
|
|
|
static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
|
|
{
|
|
return container_of(fl4, struct flowi, u.ip4);
|
|
}
|
|
|
|
static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
|
|
{
|
|
return &(fl4->__fl_common);
|
|
}
|
|
|
|
static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
|
|
{
|
|
return container_of(fl6, struct flowi, u.ip6);
|
|
}
|
|
|
|
static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
|
|
{
|
|
return &(fl6->__fl_common);
|
|
}
|
|
|
|
__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
|
|
|
|
#endif
|