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alistair23-linux/include/linux/ipv6.h
Shaohua Li 513674b5a2 net: reevalulate autoflowlabel setting after sysctl setting 
sysctl.ip6.auto_flowlabels is default 1. In our hosts, we set it to 2.
If sockopt doesn't set autoflowlabel, outcome packets from the hosts are
supposed to not include flowlabel. This is true for normal packet, but
not for reset packet.

The reason is ipv6_pinfo.autoflowlabel is set in sock creation. Later if
we change sysctl.ip6.auto_flowlabels, the ipv6_pinfo.autoflowlabel isn't
changed, so the sock will keep the old behavior in terms of auto
flowlabel. Reset packet is suffering from this problem, because reset
packet is sent from a special control socket, which is created at boot
time. Since sysctl.ipv6.auto_flowlabels is 1 by default, the control
socket will always have its ipv6_pinfo.autoflowlabel set, even after
user set sysctl.ipv6.auto_flowlabels to 1, so reset packset will always
have flowlabel. Normal sock created before sysctl setting suffers from
the same issue. We can't even turn off autoflowlabel unless we kill all
socks in the hosts.

To fix this, if IPV6_AUTOFLOWLABEL sockopt is used, we use the
autoflowlabel setting from user, otherwise we always call
ip6_default_np_autolabel() which has the new settings of sysctl.

Note, this changes behavior a little bit. Before commit 42240901f7
(ipv6: Implement different admin modes for automatic flow labels), the
autoflowlabel behavior of a sock isn't sticky, eg, if sysctl changes,
existing connection will change autoflowlabel behavior. After that
commit, autoflowlabel behavior is sticky in the whole life of the sock.
With this patch, the behavior isn't sticky again.

Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Tom Herbert <tom@quantonium.net>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-21 13:07:20 -05:00

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _IPV6_H
#define _IPV6_H
#include <uapi/linux/ipv6.h>
#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
#define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
/*
* This structure contains configuration options per IPv6 link.
*/
struct ipv6_devconf {
__s32 forwarding;
__s32 hop_limit;
__s32 mtu6;
__s32 accept_ra;
__s32 accept_redirects;
__s32 autoconf;
__s32 dad_transmits;
__s32 rtr_solicits;
__s32 rtr_solicit_interval;
__s32 rtr_solicit_max_interval;
__s32 rtr_solicit_delay;
__s32 force_mld_version;
__s32 mldv1_unsolicited_report_interval;
__s32 mldv2_unsolicited_report_interval;
__s32 use_tempaddr;
__s32 temp_valid_lft;
__s32 temp_prefered_lft;
__s32 regen_max_retry;
__s32 max_desync_factor;
__s32 max_addresses;
__s32 accept_ra_defrtr;
__s32 accept_ra_min_hop_limit;
__s32 accept_ra_pinfo;
__s32 ignore_routes_with_linkdown;
#ifdef CONFIG_IPV6_ROUTER_PREF
__s32 accept_ra_rtr_pref;
__s32 rtr_probe_interval;
#ifdef CONFIG_IPV6_ROUTE_INFO
__s32 accept_ra_rt_info_min_plen;
__s32 accept_ra_rt_info_max_plen;
#endif
#endif
__s32 proxy_ndp;
__s32 accept_source_route;
__s32 accept_ra_from_local;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
__s32 optimistic_dad;
__s32 use_optimistic;
#endif
#ifdef CONFIG_IPV6_MROUTE
__s32 mc_forwarding;
#endif
__s32 disable_ipv6;
__s32 drop_unicast_in_l2_multicast;
__s32 accept_dad;
__s32 force_tllao;
__s32 ndisc_notify;
__s32 suppress_frag_ndisc;
__s32 accept_ra_mtu;
__s32 drop_unsolicited_na;
struct ipv6_stable_secret {
bool initialized;
struct in6_addr secret;
} stable_secret;
__s32 use_oif_addrs_only;
__s32 keep_addr_on_down;
__s32 seg6_enabled;
#ifdef CONFIG_IPV6_SEG6_HMAC
__s32 seg6_require_hmac;
#endif
__u32 enhanced_dad;
__u32 addr_gen_mode;
__s32 disable_policy;
__s32 ndisc_tclass;
struct ctl_table_header *sysctl_header;
};
struct ipv6_params {
__s32 disable_ipv6;
__s32 autoconf;
};
extern struct ipv6_params ipv6_defaults;
#include <linux/icmpv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <net/inet_sock.h>
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
{
return (struct ipv6hdr *)skb_network_header(skb);
}
static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
{
return (struct ipv6hdr *)skb_inner_network_header(skb);
}
static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
{
return (struct ipv6hdr *)skb_transport_header(skb);
}
/*
This structure contains results of exthdrs parsing
as offsets from skb->nh.
*/
struct inet6_skb_parm {
int iif;
__be16 ra;
__u16 dst0;
__u16 srcrt;
__u16 dst1;
__u16 lastopt;
__u16 nhoff;
__u16 flags;
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
__u16 dsthao;
#endif
__u16 frag_max_size;
#define IP6SKB_XFRM_TRANSFORMED 1
#define IP6SKB_FORWARDED 2
#define IP6SKB_REROUTED 4
#define IP6SKB_ROUTERALERT 8
#define IP6SKB_FRAGMENTED 16
#define IP6SKB_HOPBYHOP 32
#define IP6SKB_L3SLAVE 64
#define IP6SKB_JUMBOGRAM 128
};
#if defined(CONFIG_NET_L3_MASTER_DEV)
static inline bool ipv6_l3mdev_skb(__u16 flags)
{
return flags & IP6SKB_L3SLAVE;
}
#else
static inline bool ipv6_l3mdev_skb(__u16 flags)
{
return false;
}
#endif
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))
static inline int inet6_iif(const struct sk_buff *skb)
{
bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);
return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
}
static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
{
return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
}
/* can not be used in TCP layer after tcp_v6_fill_cb */
static inline int inet6_sdif(const struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
return IP6CB(skb)->iif;
#endif
return 0;
}
/* can not be used in TCP layer after tcp_v6_fill_cb */
static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
{
#if defined(CONFIG_NET_L3_MASTER_DEV)
if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
return true;
#endif
return false;
}
struct tcp6_request_sock {
struct tcp_request_sock tcp6rsk_tcp;
};
struct ipv6_mc_socklist;
struct ipv6_ac_socklist;
struct ipv6_fl_socklist;
struct inet6_cork {
struct ipv6_txoptions *opt;
u8 hop_limit;
u8 tclass;
};
/**
* struct ipv6_pinfo - ipv6 private area
*
* In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
* this _must_ be the last member, so that inet6_sk_generic
* is able to calculate its offset from the base struct sock
* by using the struct proto->slab_obj_size member. -acme
*/
struct ipv6_pinfo {
struct in6_addr saddr;
struct in6_pktinfo sticky_pktinfo;
const struct in6_addr *daddr_cache;
#ifdef CONFIG_IPV6_SUBTREES
const struct in6_addr *saddr_cache;
#endif
__be32 flow_label;
__u32 frag_size;
/*
* Packed in 16bits.
* Omit one shift by by putting the signed field at MSB.
*/
#if defined(__BIG_ENDIAN_BITFIELD)
__s16 hop_limit:9;
__u16 __unused_1:7;
#else
__u16 __unused_1:7;
__s16 hop_limit:9;
#endif
#if defined(__BIG_ENDIAN_BITFIELD)
/* Packed in 16bits. */
__s16 mcast_hops:9;
__u16 __unused_2:6,
mc_loop:1;
#else
__u16 mc_loop:1,
__unused_2:6;
__s16 mcast_hops:9;
#endif
int ucast_oif;
int mcast_oif;
/* pktoption flags */
union {
struct {
__u16 srcrt:1,
osrcrt:1,
rxinfo:1,
rxoinfo:1,
rxhlim:1,
rxohlim:1,
hopopts:1,
ohopopts:1,
dstopts:1,
odstopts:1,
rxflow:1,
rxtclass:1,
rxpmtu:1,
rxorigdstaddr:1,
recvfragsize:1;
/* 1 bits hole */
} bits;
__u16 all;
} rxopt;
/* sockopt flags */
__u16 recverr:1,
sndflow:1,
repflow:1,
pmtudisc:3,
padding:1, /* 1 bit hole */
srcprefs:3, /* 001: prefer temporary address
* 010: prefer public address
* 100: prefer care-of address
*/
dontfrag:1,
autoflowlabel:1,
autoflowlabel_set:1;
__u8 min_hopcount;
__u8 tclass;
__be32 rcv_flowinfo;
__u32 dst_cookie;
__u32 rx_dst_cookie;
struct ipv6_mc_socklist __rcu *ipv6_mc_list;
struct ipv6_ac_socklist *ipv6_ac_list;
struct ipv6_fl_socklist __rcu *ipv6_fl_list;
struct ipv6_txoptions __rcu *opt;
struct sk_buff *pktoptions;
struct sk_buff *rxpmtu;
struct inet6_cork cork;
};
/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
struct raw6_sock {
/* inet_sock has to be the first member of raw6_sock */
struct inet_sock inet;
__u32 checksum; /* perform checksum */
__u32 offset; /* checksum offset */
struct icmp6_filter filter;
__u32 ip6mr_table;
/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
struct ipv6_pinfo inet6;
};
struct udp6_sock {
struct udp_sock udp;
/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
struct ipv6_pinfo inet6;
};
struct tcp6_sock {
struct tcp_sock tcp;
/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
struct ipv6_pinfo inet6;
};
extern int inet6_sk_rebuild_header(struct sock *sk);
struct tcp6_timewait_sock {
struct tcp_timewait_sock tcp6tw_tcp;
};
#if IS_ENABLED(CONFIG_IPV6)
bool ipv6_mod_enabled(void);
static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
{
return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
}
static inline struct raw6_sock *raw6_sk(const struct sock *sk)
{
return (struct raw6_sock *)sk;
}
static inline void inet_sk_copy_descendant(struct sock *sk_to,
const struct sock *sk_from)
{
int ancestor_size = sizeof(struct inet_sock);
if (sk_from->sk_family == PF_INET6)
ancestor_size += sizeof(struct ipv6_pinfo);
__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
}
#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
inet6_sk(sk)->rxopt.bits.rxinfo)
static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
{
if (sk->sk_family == AF_INET6)
return &sk->sk_v6_rcv_saddr;
return NULL;
}
static inline int inet_v6_ipv6only(const struct sock *sk)
{
/* ipv6only field is at same position for timewait and other sockets */
return ipv6_only_sock(sk);
}
#else
#define __ipv6_only_sock(sk) 0
#define ipv6_only_sock(sk) 0
#define ipv6_sk_rxinfo(sk) 0
static inline bool ipv6_mod_enabled(void)
{
return false;
}
static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
{
return NULL;
}
static inline struct inet6_request_sock *
inet6_rsk(const struct request_sock *rsk)
{
return NULL;
}
static inline struct raw6_sock *raw6_sk(const struct sock *sk)
{
return NULL;
}
#define inet6_rcv_saddr(__sk) NULL
#define tcp_twsk_ipv6only(__sk) 0
#define inet_v6_ipv6only(__sk) 0
#endif /* IS_ENABLED(CONFIG_IPV6) */
#endif /* _IPV6_H */
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