0b0dff5b3b
Ipv6 flowlabels historically require a reservation before use. Optionally in exclusive mode (e.g., user-private). Commit59c820b231("ipv6: elide flowlabel check if no exclusive leases exist") introduced a fastpath that avoids this check when no exclusive leases exist in the system, and thus any flowlabel use will be granted. That allows skipping the control operation to reserve a flowlabel entirely. Though with a warning if the fast path fails: This is an optimization. Robust applications still have to revert to requesting leases if the fast path fails due to an exclusive lease. Still, this is subtle. Better isolate network namespaces from each other. Flowlabels are per-netns. Also record per-netns whether exclusive leases are in use. Then behavior does not change based on activity in other netns. Changes v2 - wrap in IS_ENABLED(CONFIG_IPV6) to avoid breakage if disabled Fixes:59c820b231("ipv6: elide flowlabel check if no exclusive leases exist") Link: https://lore.kernel.org/netdev/MWHPR2201MB1072BCCCFCE779E4094837ACD0329@MWHPR2201MB1072.namprd22.prod.outlook.com/ Reported-by: Congyu Liu <liu3101@purdue.edu> Signed-off-by: Willem de Bruijn <willemb@google.com> Tested-by: Congyu Liu <liu3101@purdue.edu> Link: https://lore.kernel.org/r/20220215160037.1976072-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* ipv6 in net namespaces
|
|
*/
|
|
|
|
#include <net/inet_frag.h>
|
|
|
|
#ifndef __NETNS_IPV6_H__
|
|
#define __NETNS_IPV6_H__
|
|
#include <net/dst_ops.h>
|
|
#include <uapi/linux/icmpv6.h>
|
|
|
|
struct ctl_table_header;
|
|
|
|
struct netns_sysctl_ipv6 {
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table_header *hdr;
|
|
struct ctl_table_header *route_hdr;
|
|
struct ctl_table_header *icmp_hdr;
|
|
struct ctl_table_header *frags_hdr;
|
|
struct ctl_table_header *xfrm6_hdr;
|
|
#endif
|
|
int flush_delay;
|
|
int ip6_rt_max_size;
|
|
int ip6_rt_gc_min_interval;
|
|
int ip6_rt_gc_timeout;
|
|
int ip6_rt_gc_interval;
|
|
int ip6_rt_gc_elasticity;
|
|
int ip6_rt_mtu_expires;
|
|
int ip6_rt_min_advmss;
|
|
u32 multipath_hash_fields;
|
|
u8 multipath_hash_policy;
|
|
u8 bindv6only;
|
|
u8 flowlabel_consistency;
|
|
u8 auto_flowlabels;
|
|
int icmpv6_time;
|
|
u8 icmpv6_echo_ignore_all;
|
|
u8 icmpv6_echo_ignore_multicast;
|
|
u8 icmpv6_echo_ignore_anycast;
|
|
DECLARE_BITMAP(icmpv6_ratemask, ICMPV6_MSG_MAX + 1);
|
|
unsigned long *icmpv6_ratemask_ptr;
|
|
u8 anycast_src_echo_reply;
|
|
u8 ip_nonlocal_bind;
|
|
u8 fwmark_reflect;
|
|
u8 flowlabel_state_ranges;
|
|
int idgen_retries;
|
|
int idgen_delay;
|
|
int flowlabel_reflect;
|
|
int max_dst_opts_cnt;
|
|
int max_hbh_opts_cnt;
|
|
int max_dst_opts_len;
|
|
int max_hbh_opts_len;
|
|
int seg6_flowlabel;
|
|
u32 ioam6_id;
|
|
u64 ioam6_id_wide;
|
|
bool skip_notify_on_dev_down;
|
|
u8 fib_notify_on_flag_change;
|
|
};
|
|
|
|
struct netns_ipv6 {
|
|
/* Keep ip6_dst_ops at the beginning of netns_sysctl_ipv6 */
|
|
struct dst_ops ip6_dst_ops;
|
|
|
|
struct netns_sysctl_ipv6 sysctl;
|
|
struct ipv6_devconf *devconf_all;
|
|
struct ipv6_devconf *devconf_dflt;
|
|
struct inet_peer_base *peers;
|
|
struct fqdir *fqdir;
|
|
struct fib6_info *fib6_null_entry;
|
|
struct rt6_info *ip6_null_entry;
|
|
struct rt6_statistics *rt6_stats;
|
|
struct timer_list ip6_fib_timer;
|
|
struct hlist_head *fib_table_hash;
|
|
struct fib6_table *fib6_main_tbl;
|
|
struct list_head fib6_walkers;
|
|
rwlock_t fib6_walker_lock;
|
|
spinlock_t fib6_gc_lock;
|
|
unsigned int ip6_rt_gc_expire;
|
|
unsigned long ip6_rt_last_gc;
|
|
unsigned char flowlabel_has_excl;
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
bool fib6_has_custom_rules;
|
|
unsigned int fib6_rules_require_fldissect;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
unsigned int fib6_routes_require_src;
|
|
#endif
|
|
struct rt6_info *ip6_prohibit_entry;
|
|
struct rt6_info *ip6_blk_hole_entry;
|
|
struct fib6_table *fib6_local_tbl;
|
|
struct fib_rules_ops *fib6_rules_ops;
|
|
#endif
|
|
struct sock * __percpu *icmp_sk;
|
|
struct sock *ndisc_sk;
|
|
struct sock *tcp_sk;
|
|
struct sock *igmp_sk;
|
|
struct sock *mc_autojoin_sk;
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
#ifndef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
|
|
struct mr_table *mrt6;
|
|
#else
|
|
struct list_head mr6_tables;
|
|
struct fib_rules_ops *mr6_rules_ops;
|
|
#endif
|
|
#endif
|
|
atomic_t dev_addr_genid;
|
|
atomic_t fib6_sernum;
|
|
struct seg6_pernet_data *seg6_data;
|
|
struct fib_notifier_ops *notifier_ops;
|
|
struct fib_notifier_ops *ip6mr_notifier_ops;
|
|
unsigned int ipmr_seq; /* protected by rtnl_mutex */
|
|
struct {
|
|
struct hlist_head head;
|
|
spinlock_t lock;
|
|
u32 seq;
|
|
} ip6addrlbl_table;
|
|
struct ioam6_pernet_data *ioam6_data;
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
|
|
struct netns_nf_frag {
|
|
struct fqdir *fqdir;
|
|
};
|
|
#endif
|
|
|
|
#endif
|