From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- include/net/udplite.h | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 include/net/udplite.h (limited to 'include/net/udplite.h') diff --git a/include/net/udplite.h b/include/net/udplite.h new file mode 100644 index 000000000..299c14ce2 --- /dev/null +++ b/include/net/udplite.h @@ -0,0 +1,86 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Definitions for the UDP-Lite (RFC 3828) code. + */ +#ifndef _UDPLITE_H +#define _UDPLITE_H + +#include +#include + +/* UDP-Lite socket options */ +#define UDPLITE_SEND_CSCOV 10 /* sender partial coverage (as sent) */ +#define UDPLITE_RECV_CSCOV 11 /* receiver partial coverage (threshold ) */ + +extern struct proto udplite_prot; +extern struct udp_table udplite_table; + +/* + * Checksum computation is all in software, hence simpler getfrag. + */ +static __inline__ int udplite_getfrag(void *from, char *to, int offset, + int len, int odd, struct sk_buff *skb) +{ + struct msghdr *msg = from; + return copy_from_iter_full(to, len, &msg->msg_iter) ? 0 : -EFAULT; +} + +/* + * Checksumming routines + */ +static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh) +{ + u16 cscov; + + /* In UDPv4 a zero checksum means that the transmitter generated no + * checksum. UDP-Lite (like IPv6) mandates checksums, hence packets + * with a zero checksum field are illegal. */ + if (uh->check == 0) { + net_dbg_ratelimited("UDPLite: zeroed checksum field\n"); + return 1; + } + + cscov = ntohs(uh->len); + + if (cscov == 0) /* Indicates that full coverage is required. */ + ; + else if (cscov < 8 || cscov > skb->len) { + /* + * Coverage length violates RFC 3828: log and discard silently. + */ + net_dbg_ratelimited("UDPLite: bad csum coverage %d/%d\n", + cscov, skb->len); + return 1; + + } else if (cscov < skb->len) { + UDP_SKB_CB(skb)->partial_cov = 1; + UDP_SKB_CB(skb)->cscov = cscov; + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->ip_summed = CHECKSUM_NONE; + skb->csum_valid = 0; + } + + return 0; +} + +/* Fast-path computation of checksum. Socket may not be locked. */ +static inline __wsum udplite_csum(struct sk_buff *skb) +{ + const struct udp_sock *up = udp_sk(skb->sk); + const int off = skb_transport_offset(skb); + int len = skb->len - off; + + if ((up->pcflag & UDPLITE_SEND_CC) && up->pcslen < len) { + if (0 < up->pcslen) + len = up->pcslen; + udp_hdr(skb)->len = htons(up->pcslen); + } + skb->ip_summed = CHECKSUM_NONE; /* no HW support for checksumming */ + + return skb_checksum(skb, off, len, 0); +} + +void udplite4_register(void); +int udplite_get_port(struct sock *sk, unsigned short snum, + int (*scmp)(const struct sock *, const struct sock *)); +#endif /* _UDPLITE_H */ -- cgit v1.2.3