linux/include/net/ipv6.h, branch v5.17

ipv6: per-netns exclusive flowlabel checks

2022-02-17T04:37:47Z

Ipv6 flowlabels historically require a reservation before use. Optionally in exclusive mode (e.g., user-private). Commit 59c820b2317f ("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: 59c820b2317f ("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 Signed-off-by: Willem de Bruijn Tested-by: Congyu Liu Link: https://lore.kernel.org/r/20220215160037.1976072-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski

net: Don't include filter.h from net/sock.h

2021-12-29T16:48:14Z

sock.h is pretty heavily used (5k objects rebuilt on x86 after it's touched). We can drop the include of filter.h from it and add a forward declaration of struct sk_filter instead. This decreases the number of rebuilt objects when bpf.h is touched from ~5k to ~1k. There's a lot of missing includes this was masking. Primarily in networking tho, this time. Signed-off-by: Jakub Kicinski Signed-off-by: Alexei Starovoitov Acked-by: Marc Kleine-Budde Acked-by: Florian Fainelli Acked-by: Nikolay Aleksandrov Acked-by: Stefano Garzarella Link: https://lore.kernel.org/bpf/20211229004913.513372-1-kuba@kernel.org

ipv6: shrink struct ipcm6_cookie

2021-11-16T13:10:34Z

gso_size can be moved after tclass, to use an existing hole. (8 bytes saved on 64bit arches) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

ipv6: guard IPV6_MINHOPCOUNT with a static key

2021-10-26T01:02:13Z

RFC 5082 IPV6_MINHOPCOUNT is rarely used on hosts. Add a static key to remove from TCP fast path useless code, and potential cache line miss to fetch tcp_inet6_sk(sk)->min_hopcount Note that once ip6_min_hopcount static key has been enabled, it stays enabled until next boot. Signed-off-by: Eric Dumazet Acked-by: Soheil Hassas Yeganeh Signed-off-by: Jakub Kicinski

ipv6: Add a sysctl to control multipath hash fields

2021-05-18T20:27:32Z

A subsequent patch will add a new multipath hash policy where the packet fields used for multipath hash calculation are determined by user space. This patch adds a sysctl that allows user space to set these fields. The packet fields are represented using a bitmask and are common between IPv4 and IPv6 to allow user space to use the same numbering across both protocols. For example, to hash based on standard 5-tuple: # sysctl -w net.ipv6.fib_multipath_hash_fields=0x0037 net.ipv6.fib_multipath_hash_fields = 0x0037 To avoid introducing holes in 'struct netns_sysctl_ipv6', move the 'bindv6only' field after the multipath hash fields. The kernel rejects unknown fields, for example: # sysctl -w net.ipv6.fib_multipath_hash_fields=0x1000 sysctl: setting key "net.ipv6.fib_multipath_hash_fields": Invalid argument Signed-off-by: Ido Schimmel Reviewed-by: David Ahern Signed-off-by: David S. Miller

seg6: add support for IPv4 decapsulation in ipv6_srh_rcv()

2021-03-12T00:09:21Z

As specified in IETF RFC 8754, section 4.3.1.2, if the upper layer header is IPv4 or IPv6, perform IPv6 decapsulation and resubmit the decapsulated packet to the IPv4 or IPv6 module. Only IPv6 decapsulation was implemented. This patch adds support for IPv4 decapsulation. Link: https://tools.ietf.org/html/rfc8754#section-4.3.1.2 Signed-off-by: Julien Massonneau Signed-off-by: David S. Miller

net: pass a sockptr_t into ->setsockopt

2020-07-24T22:41:54Z

Rework the remaining setsockopt code to pass a sockptr_t instead of a plain user pointer. This removes the last remaining set_fs(KERNEL_DS) outside of architecture specific code. Signed-off-by: Christoph Hellwig Acked-by: Stefan Schmidt [ieee802154] Acked-by: Matthieu Baerts Signed-off-by: David S. Miller

net/ipv6: switch ipv6_flowlabel_opt to sockptr_t

2020-07-24T22:41:54Z

Pass a sockptr_t to prepare for set_fs-less handling of the kernel pointer from bpf-cgroup. Note that the get case is pretty weird in that it actually copies data back to userspace from setsockopt. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller

net/ipv6: remove compat_ipv6_{get,set}sockopt

2020-07-20T01:16:41Z

Handle the few cases that need special treatment in-line using in_compat_syscall(). This also removes all the now unused compat_{get,set}sockopt methods. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller

ipv6: add ip6_sock_set_recvpktinfo

2020-05-28T18:11:46Z

Add a helper to directly set the IPV6_RECVPKTINFO sockopt from kernel space without going through a fake uaccess. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller