kernel/git/next/linux-next.git/include/net/ndisc.h, branch pending-fixes

ipv6: ndisc: Add ndisc_check_ns_na() validation helper

2026-08-07T23:32:46+00:00

Add ndisc_check_ns_na(), a standalone NS/NA packet validator modeled after ipv6_mc_check_mld(). It performs the RFC 4861 section 7.1.1 (Neighbor Solicitation) and 7.1.2 (Neighbor Advertisement) mandatory checks that are relevant for software operating at the bridge level, where packets bypass the normal IPv6 stack path: - Hop Limit must be 255 (packet was not forwarded by a router) - ICMPv6 checksum is valid - ICMP Code is 0 - ICMP length is at least 24 octets (sizeof(struct nd_msg)) - Target Address must not be a multicast address - All included options have a length that is greater than zero - NS/DAD: destination must be a solicited-node multicast address - NS/DAD: no Source Link-Layer Address option when source is unspecified - NA: Solicited flag must be 0 when IP Destination is multicast On success the function sets the skb transport header and returns 0, matching the convention of ipv6_mc_check_mld(). Reviewed-by: Petr Machata Acked-by: Nikolay Aleksandrov Signed-off-by: Danielle Ratson Link: https://patch.msgid.link/20260803112505.613873-3-danieller@nvidia.com Signed-off-by: Jakub Kicinski

ipv6: remove ipv6_stub infrastructure completely

2026-03-29T18:21:24+00:00

As IPv6 is built-in only and there are no more users of ipv6_stub, the ipv6_stub is now entirely obsolete. Remove all the code related to the definition, initialization and usage. Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Link: https://patch.msgid.link/20260325120928.15848-11-fmancera@suse.de Signed-off-by: Jakub Kicinski

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

net: replace ND_PRINTK with dynamic debug

2025-07-10T22:27:32+00:00

ND_PRINTK with val > 1 only works when the ND_DEBUG was set in compilation phase. Replace it with dynamic debug. Convert ND_PRINTK with val <= 1 to net_{err,warn}_ratelimited, and convert the rest to net_dbg_ratelimited. Suggested-by: Ido Schimmel Signed-off-by: Wang Liang Reviewed-by: Ido Schimmel Link: https://patch.msgid.link/20250708033342.1627636-1-wangliang74@huawei.com Signed-off-by: Jakub Kicinski

ipv6: eliminate ndisc_ops_is_useropt()

2024-08-13T00:23:57+00:00

as it doesn't seem to offer anything of value. There's only 1 trivial user: int lowpan_ndisc_is_useropt(u8 nd_opt_type) { return nd_opt_type == ND_OPT_6CO; } but there's no harm to always treating that as a useropt... Cc: David Ahern Cc: YOSHIFUJI Hideaki / 吉藤英明 Signed-off-by: Maciej Żenczykowski Link: https://patch.msgid.link/20240730003010.156977-1-maze@google.com Signed-off-by: Jakub Kicinski

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24T18:59:29+00:00

const qualify the struct ctl_table argument in the proc_handler function signatures. This is a prerequisite to moving the static ctl_table structs into .rodata data which will ensure that proc_handler function pointers cannot be modified. This patch has been generated by the following coccinelle script: ``` virtual patch @r1@ identifier ctl, write, buffer, lenp, ppos; identifier func !~ "appldata_(timer|interval)_handler|sched_(rt|rr)_handler|rds_tcp_skbuf_handler|proc_sctp_do_(hmac_alg|rto_min|rto_max|udp_port|alpha_beta|auth|probe_interval)"; @@ int func( - struct ctl_table *ctl + const struct ctl_table *ctl ,int write, void *buffer, size_t *lenp, loff_t *ppos); @r2@ identifier func, ctl, write, buffer, lenp, ppos; @@ int func( - struct ctl_table *ctl + const struct ctl_table *ctl ,int write, void *buffer, size_t *lenp, loff_t *ppos) { ... } @r3@ identifier func; @@ int func( - struct ctl_table * + const struct ctl_table * ,int , void *, size_t *, loff_t *); @r4@ identifier func, ctl; @@ int func( - struct ctl_table *ctl + const struct ctl_table *ctl ,int , void *, size_t *, loff_t *); @r5@ identifier func, write, buffer, lenp, ppos; @@ int func( - struct ctl_table * + const struct ctl_table * ,int write, void *buffer, size_t *lenp, loff_t *ppos); ``` * Code formatting was adjusted in xfs_sysctl.c to comply with code conventions. The xfs_stats_clear_proc_handler, xfs_panic_mask_proc_handler and xfs_deprecated_dointvec_minmax where adjusted. * The ctl_table argument in proc_watchdog_common was const qualified. This is called from a proc_handler itself and is calling back into another proc_handler, making it necessary to change it as part of the proc_handler migration. Co-developed-by: Thomas Weißschuh Signed-off-by: Thomas Weißschuh Co-developed-by: Joel Granados Signed-off-by: Joel Granados

ndisc: Remove unused ndisc_ifinfo_sysctl_strategy() declaration

2023-08-07T07:53:55+00:00

Commit f8572d8f2a2b ("sysctl net: Remove unused binary sysctl code") left behind this declaration. Signed-off-by: Yue Haibing Reviewed-by: David Ahern Signed-off-by: David S. Miller

neighbour: switch to standard rcu, instead of rcu_bh

2023-03-22T04:32:18+00:00

rcu_bh is no longer a win, especially for objects freed with standard call_rcu(). Switch neighbour code to no longer disable BH when not necessary. Signed-off-by: Eric Dumazet Signed-off-by: Jakub Kicinski

ipv6: icmp6: add drop reason support to ndisc_rcv()

2023-02-14T03:55:32+00:00

Creates three new drop reasons: SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2022-03-03T19:55:12+00:00

net/batman-adv/hard-interface.c commit 690bb6fb64f5 ("batman-adv: Request iflink once in batadv-on-batadv check") commit 6ee3c393eeb7 ("batman-adv: Demote batadv-on-batadv skip error message") https://lore.kernel.org/all/20220302163049.101957-1-sw@simonwunderlich.de/ net/smc/af_smc.c commit 4d08b7b57ece ("net/smc: Fix cleanup when register ULP fails") commit 462791bbfa35 ("net/smc: add sysctl interface for SMC") https://lore.kernel.org/all/20220302112209.355def40@canb.auug.org.au/ Signed-off-by: Jakub Kicinski