cregit-Linux how code gets into the kernel

Release 4.11 net/ipv6/ip6_checksum.c

Directory: net/ipv6
#include <net/ip.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <asm/checksum.h>

#ifndef _HAVE_ARCH_IPV6_CSUM

__sum16 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, __u32 len, __u8 proto, __wsum csum) { int carry; __u32 ulen; __u32 uproto; __u32 sum = (__force u32)csum; sum += (__force u32)saddr->s6_addr32[0]; carry = (sum < (__force u32)saddr->s6_addr32[0]); sum += carry; sum += (__force u32)saddr->s6_addr32[1]; carry = (sum < (__force u32)saddr->s6_addr32[1]); sum += carry; sum += (__force u32)saddr->s6_addr32[2]; carry = (sum < (__force u32)saddr->s6_addr32[2]); sum += carry; sum += (__force u32)saddr->s6_addr32[3]; carry = (sum < (__force u32)saddr->s6_addr32[3]); sum += carry; sum += (__force u32)daddr->s6_addr32[0]; carry = (sum < (__force u32)daddr->s6_addr32[0]); sum += carry; sum += (__force u32)daddr->s6_addr32[1]; carry = (sum < (__force u32)daddr->s6_addr32[1]); sum += carry; sum += (__force u32)daddr->s6_addr32[2]; carry = (sum < (__force u32)daddr->s6_addr32[2]); sum += carry; sum += (__force u32)daddr->s6_addr32[3]; carry = (sum < (__force u32)daddr->s6_addr32[3]); sum += carry; ulen = (__force u32)htonl((__u32) len); sum += ulen; carry = (sum < ulen); sum += carry; uproto = (__force u32)htonl(proto); sum += uproto; carry = (sum < uproto); sum += carry; return csum_fold((__force __wsum)sum); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang38299.74%150.00%
Alexander Duyck10.26%150.00%
Total383100.00%2100.00%

EXPORT_SYMBOL(csum_ipv6_magic); #endif
int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto) { int err; UDP_SKB_CB(skb)->partial_cov = 0; UDP_SKB_CB(skb)->cscov = skb->len; if (proto == IPPROTO_UDPLITE) { err = udplite_checksum_init(skb, uh); if (err) return err; } /* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels) * we accept a checksum of zero here. When we find the socket * for the UDP packet we'll check if that socket allows zero checksum * for IPv6 (set by socket option). * * Note, we are only interested in != 0 or == 0, thus the * force to int. */ return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, ip6_compute_pseudo); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang6880.95%120.00%
Björn Mork67.14%120.00%
Hannes Frederic Sowa55.95%120.00%
Tom Herbert55.95%240.00%
Total84100.00%5100.00%

EXPORT_SYMBOL(udp6_csum_init); /* Function to set UDP checksum for an IPv6 UDP packet. This is intended * for the simple case like when setting the checksum for a UDP tunnel. */
void udp6_set_csum(bool nocheck, struct sk_buff *skb, const struct in6_addr *saddr, const struct in6_addr *daddr, int len) { struct udphdr *uh = udp_hdr(skb); if (nocheck) uh->check = 0; else if (skb_is_gso(skb)) uh->check = ~udp_v6_check(len, saddr, daddr, 0); else if (skb->ip_summed == CHECKSUM_PARTIAL) { uh->check = 0; uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb)); if (uh->check == 0) uh->check = CSUM_MANGLED_0; } else { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct udphdr, check); uh->check = ~udp_v6_check(len, saddr, daddr, 0); } }

Contributors

PersonTokensPropCommitsCommitProp
Tom Herbert12472.51%133.33%
Edward Cree4727.49%266.67%
Total171100.00%3100.00%

EXPORT_SYMBOL(udp6_set_csum);

Overall Contributors

PersonTokensPropCommitsCommitProp
Américo Wang47771.09%111.11%
Tom Herbert13520.12%333.33%
Edward Cree477.00%222.22%
Björn Mork60.89%111.11%
Hannes Frederic Sowa50.75%111.11%
Alexander Duyck10.15%111.11%
Total671100.00%9100.00%
Directory: net/ipv6
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