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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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63a6fff353
Packets arriving in a VRF currently are delivered to UDP sockets that aren't bound to any interface. TCP defaults to not delivering packets arriving in a VRF to unbound sockets. IP route lookup and socket transmit both assume that unbound means using the default table and UDP applications that haven't been changed to be aware of VRFs may not function correctly in this case since they may not be able to handle overlapping IP address ranges, or be able to send packets back to the original sender if required. So add a sysctl, udp_l3mdev_accept, to control this behaviour with it being analgous to the existing tcp_l3mdev_accept, namely to allow a process to have a VRF-global listen socket. Have this default to off as this is the behaviour that users will expect, given that there is no explicit mechanism to set unmodified VRF-unaware application into a default VRF. Signed-off-by: Robert Shearman <rshearma@brocade.com> Acked-by: David Ahern <dsa@cumulusnetworks.com> Tested-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
161 lines
3.6 KiB
C
161 lines
3.6 KiB
C
/*
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* ipv4 in net namespaces
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*/
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#ifndef __NETNS_IPV4_H__
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#define __NETNS_IPV4_H__
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#include <linux/uidgid.h>
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#include <net/inet_frag.h>
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#include <linux/rcupdate.h>
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struct tcpm_hash_bucket;
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struct ctl_table_header;
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struct ipv4_devconf;
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struct fib_rules_ops;
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struct hlist_head;
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struct fib_table;
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struct sock;
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struct local_ports {
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seqlock_t lock;
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int range[2];
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bool warned;
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};
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struct ping_group_range {
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seqlock_t lock;
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kgid_t range[2];
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};
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struct inet_hashinfo;
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struct inet_timewait_death_row {
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atomic_t tw_count;
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struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp;
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int sysctl_tw_recycle;
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int sysctl_max_tw_buckets;
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};
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struct netns_ipv4 {
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#ifdef CONFIG_SYSCTL
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struct ctl_table_header *forw_hdr;
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struct ctl_table_header *frags_hdr;
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struct ctl_table_header *ipv4_hdr;
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struct ctl_table_header *route_hdr;
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struct ctl_table_header *xfrm4_hdr;
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#endif
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struct ipv4_devconf *devconf_all;
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struct ipv4_devconf *devconf_dflt;
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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struct fib_rules_ops *rules_ops;
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bool fib_has_custom_rules;
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struct fib_table __rcu *fib_main;
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struct fib_table __rcu *fib_default;
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#endif
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#ifdef CONFIG_IP_ROUTE_CLASSID
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int fib_num_tclassid_users;
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#endif
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struct hlist_head *fib_table_hash;
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bool fib_offload_disabled;
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struct sock *fibnl;
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struct sock * __percpu *icmp_sk;
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struct sock *mc_autojoin_sk;
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struct inet_peer_base *peers;
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struct sock * __percpu *tcp_sk;
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struct netns_frags frags;
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#ifdef CONFIG_NETFILTER
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struct xt_table *iptable_filter;
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struct xt_table *iptable_mangle;
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struct xt_table *iptable_raw;
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struct xt_table *arptable_filter;
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#ifdef CONFIG_SECURITY
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struct xt_table *iptable_security;
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#endif
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struct xt_table *nat_table;
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#endif
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int sysctl_icmp_echo_ignore_all;
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int sysctl_icmp_echo_ignore_broadcasts;
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int sysctl_icmp_ignore_bogus_error_responses;
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int sysctl_icmp_ratelimit;
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int sysctl_icmp_ratemask;
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int sysctl_icmp_errors_use_inbound_ifaddr;
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struct local_ports ip_local_ports;
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int sysctl_tcp_ecn;
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int sysctl_tcp_ecn_fallback;
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int sysctl_ip_default_ttl;
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int sysctl_ip_no_pmtu_disc;
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int sysctl_ip_fwd_use_pmtu;
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int sysctl_ip_nonlocal_bind;
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/* Shall we try to damage output packets if routing dev changes? */
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int sysctl_ip_dynaddr;
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int sysctl_ip_early_demux;
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int sysctl_fwmark_reflect;
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int sysctl_tcp_fwmark_accept;
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#ifdef CONFIG_NET_L3_MASTER_DEV
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int sysctl_tcp_l3mdev_accept;
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#endif
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int sysctl_tcp_mtu_probing;
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int sysctl_tcp_base_mss;
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int sysctl_tcp_probe_threshold;
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u32 sysctl_tcp_probe_interval;
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int sysctl_tcp_keepalive_time;
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int sysctl_tcp_keepalive_probes;
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int sysctl_tcp_keepalive_intvl;
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int sysctl_tcp_syn_retries;
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int sysctl_tcp_synack_retries;
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int sysctl_tcp_syncookies;
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int sysctl_tcp_reordering;
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int sysctl_tcp_retries1;
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int sysctl_tcp_retries2;
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int sysctl_tcp_orphan_retries;
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int sysctl_tcp_fin_timeout;
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unsigned int sysctl_tcp_notsent_lowat;
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int sysctl_tcp_tw_reuse;
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struct inet_timewait_death_row tcp_death_row;
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int sysctl_max_syn_backlog;
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#ifdef CONFIG_NET_L3_MASTER_DEV
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int sysctl_udp_l3mdev_accept;
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#endif
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int sysctl_igmp_max_memberships;
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int sysctl_igmp_max_msf;
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int sysctl_igmp_llm_reports;
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int sysctl_igmp_qrv;
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struct ping_group_range ping_group_range;
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atomic_t dev_addr_genid;
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#ifdef CONFIG_SYSCTL
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unsigned long *sysctl_local_reserved_ports;
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int sysctl_ip_prot_sock;
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#endif
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#ifdef CONFIG_IP_MROUTE
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#ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
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struct mr_table *mrt;
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#else
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struct list_head mr_tables;
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struct fib_rules_ops *mr_rules_ops;
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#endif
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#endif
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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int sysctl_fib_multipath_use_neigh;
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#endif
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unsigned int fib_seq; /* protected by rtnl_mutex */
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atomic_t rt_genid;
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};
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#endif
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