kernel/linux.git/include/net/ip6_route.h, branch v7.1-rc5

ipv6: prepare headers for ipv6_stub removal

2026-03-29T18:21:23+00:00

In preparation for dropping ipv6_stub and converting its users to direct function calls, introduce static inline dummy functions and fallback macros in the IPv6 networking headers. In addition, introduce checks on fib6_nh_init(), ip6_dst_lookup_flow() and ip6_fragment() to avoid a crash due to ipv6.disable=1 set during booting. The other functions are safe as they cannot be called with ipv6.disable=1 set. These fallbacks ensure that when CONFIG_IPV6 is completely disabled, there are no compiling or linking errors due to code paths not guarded by preprocessor macro IS_ENABLED(CONFIG_IPV6). In addition, export ndisc_send_na(), ip6_route_input() and ip6_fragment(). Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Link: https://patch.msgid.link/20260325120928.15848-6-fmancera@suse.de Signed-off-by: Jakub Kicinski

ipv6: make ipv6_anycast_destination logic usable without dst_entry

2026-03-04T10:45:44+00:00

nft_fib_ipv6 uses ipv6_anycast_destination(), but upcoming patch removes the dst_entry usage in favor of fib6_result. Move the 'plen > 127' logic to a new helper and call it from the existing one. Signed-off-by: Florian Westphal

inet: add dst4_mtu() and dst6_mtu() helpers

2026-02-03T01:49:29+00:00

With CONFIG_MITIGATION_RETPOLINE=y dst_mtu() is a bit fat, because it is generic. Indeed, clang does not always inline it. Add dst4_mtu() and dst6_mtu() helpers for callers that expect either ipv4_mtu() or ip6_mtu() to be called. These helpers are always inlined. Signed-off-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20260130210303.3888261-6-edumazet@google.com Signed-off-by: Jakub Kicinski

ipv6: make ipv6_pinfo.daddr_cache a boolean

2025-09-18T08:17:09+00:00

ipv6_pinfo.daddr_cache is either NULL or &sk->sk_v6_daddr We do not need 8 bytes, a boolean is enough. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Reviewed-by: David Ahern Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250916160951.541279-3-edumazet@google.com Reviewed-by: Jakub Kicinski Signed-off-by: Paolo Abeni

ipv6: make ipv6_pinfo.saddr_cache a boolean

2025-09-18T08:17:09+00:00

ipv6_pinfo.saddr_cache is either NULL or &np->saddr. We do not need 8 bytes, a boolean is enough. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Reviewed-by: David Ahern Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250916160951.541279-2-edumazet@google.com Reviewed-by: Jakub Kicinski Signed-off-by: Paolo Abeni

net: use dst_dev_rcu() in sk_setup_caps()

2025-08-30T02:36:32+00:00

Use RCU to protect accesses to dst->dev from sk_setup_caps() and sk_dst_gso_max_size(). Also use dst_dev_rcu() in ip6_dst_mtu_maybe_forward(), and ip_dst_mtu_maybe_forward(). ip4_dst_hoplimit() can use dst_dev_net_rcu(). Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()") Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Link: https://patch.msgid.link/20250828195823.3958522-6-edumazet@google.com Signed-off-by: Jakub Kicinski

ipv6: adopt dst_dev() helper

2025-07-02T21:32:30+00:00

Use the new helper as a step to deal with potential dst->dev races. Signed-off-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250630121934.3399505-9-edumazet@google.com Signed-off-by: Jakub Kicinski

ipv6: fix source address selection with route leak

2024-07-14T14:34:16+00:00

By default, an address assigned to the output interface is selected when the source address is not specified. This is problematic when a route, configured in a vrf, uses an interface from another vrf (aka route leak). The original vrf does not own the selected source address. Let's add a check against the output interface and call the appropriate function to select the source address. CC: stable@vger.kernel.org Fixes: 0d240e7811c4 ("net: vrf: Implement get_saddr for IPv6") Signed-off-by: Nicolas Dichtel Link: https://patch.msgid.link/20240710081521.3809742-3-nicolas.dichtel@6wind.com Signed-off-by: Jakub Kicinski

ipv6: introduce dst_rt6_info() helper

2024-04-29T12:32:01+00:00

Instead of (struct rt6_info *)dst casts, we can use : #define dst_rt6_info(_ptr) \ container_of_const(_ptr, struct rt6_info, dst) Some places needed missing const qualifiers : ip6_confirm_neigh(), ipv6_anycast_destination(), ipv6_unicast_destination(), has_gateway() v2: added missing parts (David Ahern) Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Signed-off-by: David S. Miller

ipv6: annotate data-races around cnf.mtu6

2024-03-01T08:42:31+00:00

idev->cnf.mtu6 might be read locklessly, add appropriate READ_ONCE() and WRITE_ONCE() annotations. Signed-off-by: Eric Dumazet Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller