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101 lines
2.7 KiB
101 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* Checksumming functions for IPv6 |
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* |
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* Authors: Jorge Cwik, <[email protected]> |
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* Arnt Gulbrandsen, <[email protected]> |
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* Borrows very liberally from tcp.c and ip.c, see those |
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* files for more names. |
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*/ |
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/* |
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* Fixes: |
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* |
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* Ralf Baechle : generic ipv6 checksum |
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* <[email protected]> |
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*/ |
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#ifndef _CHECKSUM_IPV6_H |
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#define _CHECKSUM_IPV6_H |
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#include <asm/types.h> |
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#include <asm/byteorder.h> |
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#include <net/ip.h> |
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#include <asm/checksum.h> |
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#include <linux/in6.h> |
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#include <linux/tcp.h> |
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#include <linux/ipv6.h> |
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#ifndef _HAVE_ARCH_IPV6_CSUM |
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__sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__u32 len, __u8 proto, __wsum csum); |
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#endif |
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static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto) |
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{ |
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return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
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&ipv6_hdr(skb)->daddr, |
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skb->len, proto, 0)); |
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} |
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static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto) |
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{ |
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const struct ipv6hdr *iph = skb_gro_network_header(skb); |
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return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr, |
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skb_gro_len(skb), proto, 0)); |
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} |
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static __inline__ __sum16 tcp_v6_check(int len, |
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const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__wsum base) |
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{ |
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return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); |
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} |
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static inline void __tcp_v6_send_check(struct sk_buff *skb, |
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const struct in6_addr *saddr, |
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const struct in6_addr *daddr) |
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{ |
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struct tcphdr *th = tcp_hdr(skb); |
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if (skb->ip_summed == CHECKSUM_PARTIAL) { |
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th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
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skb->csum_start = skb_transport_header(skb) - skb->head; |
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skb->csum_offset = offsetof(struct tcphdr, check); |
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} else { |
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th->check = tcp_v6_check(skb->len, saddr, daddr, |
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csum_partial(th, th->doff << 2, |
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skb->csum)); |
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} |
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} |
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static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb) |
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{ |
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struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
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struct tcphdr *th = tcp_hdr(skb); |
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ipv6h->payload_len = 0; |
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th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0); |
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} |
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static inline __sum16 udp_v6_check(int len, |
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const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__wsum base) |
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{ |
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return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base); |
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} |
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void udp6_set_csum(bool nocheck, struct sk_buff *skb, |
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const struct in6_addr *saddr, |
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const struct in6_addr *daddr, int len); |
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int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
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#endif
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