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3f06760c00
Callers of flowi4_update_output() never try to update ->flowi4_tos:
* ip_route_connect() updates ->flowi4_tos with its own current
value.
* ip_route_newports() has two users: tcp_v4_connect() and
dccp_v4_connect. Both initialise fl4 with ip_route_connect(), which
in turn sets ->flowi4_tos with RT_TOS(inet_sk(sk)->tos) and
->flowi4_scope based on SOCK_LOCALROUTE.
Then ip_route_newports() updates ->flowi4_tos with
RT_CONN_FLAGS(sk), which is the same as RT_TOS(inet_sk(sk)->tos),
unless SOCK_LOCALROUTE is set on the socket. In that case, the
lowest order bit is set to 1, to eventually inform
ip_route_output_key_hash() to restrict the scope to RT_SCOPE_LINK.
This is equivalent to properly setting ->flowi4_scope as
ip_route_connect() did.
* ip_vs_xmit.c initialises ->flowi4_tos with memset(0), then calls
flowi4_update_output() with tos=0.
* sctp_v4_get_dst() uses the same RT_CONN_FLAGS_TOS() when
initialising ->flowi4_tos and when calling flowi4_update_output().
In the end, ->flowi4_tos never changes. So let's just drop the tos
parameter. This will simplify the conversion of ->flowi4_tos from __u8
to dscp_t.
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
195 lines
5 KiB
C
195 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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*
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* Generic internet FLOW.
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*
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*/
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#ifndef _NET_FLOW_H
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#define _NET_FLOW_H
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#include <linux/in6.h>
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#include <linux/atomic.h>
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#include <linux/container_of.h>
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#include <linux/uidgid.h>
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struct flow_keys;
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/*
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* ifindex generation is per-net namespace, and loopback is
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* always the 1st device in ns (see net_dev_init), thus any
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* loopback device should get ifindex 1
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*/
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#define LOOPBACK_IFINDEX 1
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struct flowi_tunnel {
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__be64 tun_id;
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};
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struct flowi_common {
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int flowic_oif;
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int flowic_iif;
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int flowic_l3mdev;
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__u32 flowic_mark;
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__u8 flowic_tos;
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__u8 flowic_scope;
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__u8 flowic_proto;
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__u8 flowic_flags;
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#define FLOWI_FLAG_ANYSRC 0x01
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#define FLOWI_FLAG_KNOWN_NH 0x02
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__u32 flowic_secid;
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kuid_t flowic_uid;
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struct flowi_tunnel flowic_tun_key;
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__u32 flowic_multipath_hash;
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};
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union flowi_uli {
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struct {
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__be16 dport;
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__be16 sport;
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} ports;
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struct {
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__u8 type;
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__u8 code;
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} icmpt;
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__be32 gre_key;
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struct {
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__u8 type;
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} mht;
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};
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struct flowi4 {
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struct flowi_common __fl_common;
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#define flowi4_oif __fl_common.flowic_oif
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#define flowi4_iif __fl_common.flowic_iif
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#define flowi4_l3mdev __fl_common.flowic_l3mdev
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#define flowi4_mark __fl_common.flowic_mark
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#define flowi4_tos __fl_common.flowic_tos
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#define flowi4_scope __fl_common.flowic_scope
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#define flowi4_proto __fl_common.flowic_proto
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#define flowi4_flags __fl_common.flowic_flags
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#define flowi4_secid __fl_common.flowic_secid
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#define flowi4_tun_key __fl_common.flowic_tun_key
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#define flowi4_uid __fl_common.flowic_uid
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#define flowi4_multipath_hash __fl_common.flowic_multipath_hash
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/* (saddr,daddr) must be grouped, same order as in IP header */
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__be32 saddr;
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__be32 daddr;
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union flowi_uli uli;
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#define fl4_sport uli.ports.sport
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#define fl4_dport uli.ports.dport
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#define fl4_icmp_type uli.icmpt.type
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#define fl4_icmp_code uli.icmpt.code
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#define fl4_mh_type uli.mht.type
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#define fl4_gre_key uli.gre_key
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} __attribute__((__aligned__(BITS_PER_LONG/8)));
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static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
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__u32 mark, __u8 tos, __u8 scope,
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__u8 proto, __u8 flags,
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__be32 daddr, __be32 saddr,
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__be16 dport, __be16 sport,
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kuid_t uid)
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{
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fl4->flowi4_oif = oif;
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fl4->flowi4_iif = LOOPBACK_IFINDEX;
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fl4->flowi4_l3mdev = 0;
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fl4->flowi4_mark = mark;
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fl4->flowi4_tos = tos;
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fl4->flowi4_scope = scope;
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fl4->flowi4_proto = proto;
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fl4->flowi4_flags = flags;
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fl4->flowi4_secid = 0;
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fl4->flowi4_tun_key.tun_id = 0;
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fl4->flowi4_uid = uid;
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fl4->daddr = daddr;
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fl4->saddr = saddr;
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fl4->fl4_dport = dport;
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fl4->fl4_sport = sport;
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fl4->flowi4_multipath_hash = 0;
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}
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/* Reset some input parameters after previous lookup */
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static inline void flowi4_update_output(struct flowi4 *fl4, int oif,
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__be32 daddr, __be32 saddr)
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{
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fl4->flowi4_oif = oif;
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fl4->daddr = daddr;
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fl4->saddr = saddr;
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}
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struct flowi6 {
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struct flowi_common __fl_common;
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#define flowi6_oif __fl_common.flowic_oif
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#define flowi6_iif __fl_common.flowic_iif
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#define flowi6_l3mdev __fl_common.flowic_l3mdev
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#define flowi6_mark __fl_common.flowic_mark
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#define flowi6_scope __fl_common.flowic_scope
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#define flowi6_proto __fl_common.flowic_proto
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#define flowi6_flags __fl_common.flowic_flags
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#define flowi6_secid __fl_common.flowic_secid
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#define flowi6_tun_key __fl_common.flowic_tun_key
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#define flowi6_uid __fl_common.flowic_uid
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struct in6_addr daddr;
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struct in6_addr saddr;
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/* Note: flowi6_tos is encoded in flowlabel, too. */
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__be32 flowlabel;
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union flowi_uli uli;
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#define fl6_sport uli.ports.sport
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#define fl6_dport uli.ports.dport
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#define fl6_icmp_type uli.icmpt.type
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#define fl6_icmp_code uli.icmpt.code
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#define fl6_mh_type uli.mht.type
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#define fl6_gre_key uli.gre_key
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__u32 mp_hash;
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} __attribute__((__aligned__(BITS_PER_LONG/8)));
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struct flowi {
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union {
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struct flowi_common __fl_common;
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struct flowi4 ip4;
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struct flowi6 ip6;
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} u;
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#define flowi_oif u.__fl_common.flowic_oif
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#define flowi_iif u.__fl_common.flowic_iif
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#define flowi_l3mdev u.__fl_common.flowic_l3mdev
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#define flowi_mark u.__fl_common.flowic_mark
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#define flowi_tos u.__fl_common.flowic_tos
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#define flowi_scope u.__fl_common.flowic_scope
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#define flowi_proto u.__fl_common.flowic_proto
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#define flowi_flags u.__fl_common.flowic_flags
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#define flowi_secid u.__fl_common.flowic_secid
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#define flowi_tun_key u.__fl_common.flowic_tun_key
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#define flowi_uid u.__fl_common.flowic_uid
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} __attribute__((__aligned__(BITS_PER_LONG/8)));
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static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
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{
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return container_of(fl4, struct flowi, u.ip4);
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}
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static inline struct flowi_common *flowi4_to_flowi_common(struct flowi4 *fl4)
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{
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return &(fl4->__fl_common);
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}
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static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
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{
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return container_of(fl6, struct flowi, u.ip6);
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}
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static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6)
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{
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return &(fl6->__fl_common);
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}
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__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
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#endif
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