kernel/git/stable/linux.git/include/net/udplite.h, branch master

udp: Remove UDPLITE_SEND_CSCOV and UDPLITE_RECV_CSCOV.

2026-03-14T01:57:45+00:00

UDP-Lite supports variable-length checksum and has two socket options, UDPLITE_SEND_CSCOV and UDPLITE_RECV_CSCOV, to control the checksum coverage. Let's remove the support. setsockopt(UDPLITE_SEND_CSCOV / UDPLITE_RECV_CSCOV) was only available for UDP-Lite and returned -ENOPROTOOPT for UDP. Now, the options are handled in ip_setsockopt() and ipv6_setsockopt(), which still return the same error. getsockopt(UDPLITE_SEND_CSCOV / UDPLITE_RECV_CSCOV) was available for UDP and always returned 0, meaning full checksum, but now -ENOPROTOOPT is returned. Given that getsockopt() is meaningless for UDP and even the options are not defined under include/uapi/, this should not be a problem. $ man 7 udplite ... BUGS Where glibc support is missing, the following definitions are needed: #define IPPROTO_UDPLITE 136 #define UDPLITE_SEND_CSCOV 10 #define UDPLITE_RECV_CSCOV 11 Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260311052020.1213705-10-kuniyu@google.com Signed-off-by: Jakub Kicinski

udp: Remove partial csum code in TX.

2026-03-14T01:57:45+00:00

UDP TX paths also have some code for UDP-Lite partial checksum: * udplite_csum() in udp_send_skb() and udp_v6_send_skb() * udplite_getfrag() in udp_sendmsg() and udpv6_sendmsg() Let's remove such code. Now, we can use IPPROTO_UDP directly instead of sk->sk_protocol or fl6->flowi6_proto for csum_tcpudp_magic() and csum_ipv6_magic(). Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260311052020.1213705-9-kuniyu@google.com Signed-off-by: Jakub Kicinski

udp: Remove partial csum code in RX.

2026-03-14T01:57:45+00:00

UDP-Lite supports the partial checksum and the coverage is stored in the position of the length field of struct udphdr. In RX paths, udp4_csum_init() / udp6_csum_init() save the value in UDP_SKB_CB(skb)->cscov and set UDP_SKB_CB(skb)->partial_cov to 1 if the coverage is not full. The subsequent processing diverges depending on the value, but such paths are now dead. Also, these functions have some code guarded for UDP: * udp_unicast_rcv_skb / udp6_unicast_rcv_skb * __udp4_lib_rcv() and __udp6_lib_rcv(). Let's remove the partial csum code and the unnecessary guard for UDP-Lite in RX. Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260311052020.1213705-8-kuniyu@google.com Signed-off-by: Jakub Kicinski

ipv4: Retire UDP-Lite.

2026-03-14T01:57:44+00:00

We have deprecated IPv6 UDP-Lite sockets. Let's drop support for IPv4 UDP-Lite sockets as well. Most of the changes are similar to the IPv6 patch: removing udplite.c and udp_impl.h, marking most functions in udp_impl.h as static, moving the prototype for udp_recvmsg() to udp.h, and adding INDIRECT_CALLABLE_SCOPE for it. In addition, the INET_DIAG support for UDP-Lite is dropped. We will remove the remaining dead code in the following patches. Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260311052020.1213705-5-kuniyu@google.com Signed-off-by: Jakub Kicinski

udplite: fix various data-races

2023-09-14T14:16:36+00:00

udp->pcflag, udp->pcslen and udp->pcrlen reads/writes are racy. Move udp->pcflag to udp->udp_flags for atomicity, and add READ_ONCE()/WRITE_ONCE() annotations for pcslen and pcrlen. Fixes: ba4e58eca8aa ("[NET]: Supporting UDP-Lite (RFC 3828) in Linux") Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Signed-off-by: Paolo Abeni

udp/udplite: Remove unused function declarations udp{,lite}_get_port()

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

Commit 6ba5a3c52da0 ("[UDP]: Make full use of proto.h.udp_hash innovation.") removed these implementations but leave declarations. Signed-off-by: Yue Haibing Reviewed-by: Willem de Bruijn Signed-off-by: David S. Miller

tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().

2022-10-13T00:50:37+00:00

Originally, inet6_sk(sk)->XXX were changed under lock_sock(), so we were able to clean them up by calling inet6_destroy_sock() during the IPv6 -> IPv4 conversion by IPV6_ADDRFORM. However, commit 03485f2adcde ("udpv6: Add lockless sendmsg() support") added a lockless memory allocation path, which could cause a memory leak: setsockopt(IPV6_ADDRFORM) sendmsg() +-----------------------+ +-------+ - do_ipv6_setsockopt(sk, ...) - udpv6_sendmsg(sk, ...) - sockopt_lock_sock(sk) ^._ called via udpv6_prot - lock_sock(sk) before WRITE_ONCE() - WRITE_ONCE(sk->sk_prot, &tcp_prot) - inet6_destroy_sock() - if (!corkreq) - sockopt_release_sock(sk) - ip6_make_skb(sk, ...) - release_sock(sk) ^._ lockless fast path for the non-corking case - __ip6_append_data(sk, ...) - ipv6_local_rxpmtu(sk, ...) - xchg(&np->rxpmtu, skb) ^._ rxpmtu is never freed. - goto out_no_dst; - lock_sock(sk) For now, rxpmtu is only the case, but not to miss the future change and a similar bug fixed in commit e27326009a3d ("net: ping6: Fix memleak in ipv6_renew_options()."), let's set a new function to IPv6 sk->sk_destruct() and call inet6_cleanup_sock() there. Since the conversion does not change sk->sk_destruct(), we can guarantee that we can clean up IPv6 resources finally. We can now remove all inet6_destroy_sock() calls from IPv6 protocol specific ->destroy() functions, but such changes are invasive to backport. So they can be posted as a follow-up later for net-next. Fixes: 03485f2adcde ("udpv6: Add lockless sendmsg() support") Signed-off-by: Kuniyuki Iwashima Signed-off-by: Jakub Kicinski

net: add missing includes and forward declarations under net/

2022-07-22T11:53:22+00:00

This patch adds missing includes to headers under include/net. All these problems are currently masked by the existing users including the missing dependency before the broken header. Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller

udplite: remove udplite_csum_outgoing()

2022-01-27T13:53:27+00:00

Not used since v4.0. Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller

udplite: fix partial checksum initialization

2018-02-16T20:57:42+00:00

Since UDP-Lite is always using checksum, the following path is triggered when calculating pseudo header for it: udp4_csum_init() or udp6_csum_init() skb_checksum_init_zero_check() __skb_checksum_validate_complete() The problem can appear if skb->len is less than CHECKSUM_BREAK. In this particular case __skb_checksum_validate_complete() also invokes __skb_checksum_complete(skb). If UDP-Lite is using partial checksum that covers only part of a packet, the function will return bad checksum and the packet will be dropped. It can be fixed if we skip skb_checksum_init_zero_check() and only set the required pseudo header checksum for UDP-Lite with partial checksum before udp4_csum_init()/udp6_csum_init() functions return. Fixes: ed70fcfcee95 ("net: Call skb_checksum_init in IPv4") Fixes: e4f45b7f40bd ("net: Call skb_checksum_init in IPv6") Signed-off-by: Alexey Kodanev Signed-off-by: David S. Miller