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74f0cca110
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 <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260311052020.1213705-10-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <net/ip.h>
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#include <net/ip6_checksum.h>
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#include <net/udp.h>
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#include <asm/checksum.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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{
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int carry;
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__u32 ulen;
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__u32 uproto;
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__u32 sum = (__force u32)csum;
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sum += (__force u32)saddr->s6_addr32[0];
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carry = (sum < (__force u32)saddr->s6_addr32[0]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[1];
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carry = (sum < (__force u32)saddr->s6_addr32[1]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[2];
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carry = (sum < (__force u32)saddr->s6_addr32[2]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[3];
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carry = (sum < (__force u32)saddr->s6_addr32[3]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[0];
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carry = (sum < (__force u32)daddr->s6_addr32[0]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[1];
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carry = (sum < (__force u32)daddr->s6_addr32[1]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[2];
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carry = (sum < (__force u32)daddr->s6_addr32[2]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[3];
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carry = (sum < (__force u32)daddr->s6_addr32[3]);
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sum += carry;
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ulen = (__force u32)htonl((__u32) len);
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sum += ulen;
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carry = (sum < ulen);
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sum += carry;
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uproto = (__force u32)htonl(proto);
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sum += uproto;
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carry = (sum < uproto);
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sum += carry;
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return csum_fold((__force __wsum)sum);
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}
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EXPORT_SYMBOL(csum_ipv6_magic);
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#endif
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/* Function to set UDP checksum for an IPv6 UDP packet. This is intended
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* for the simple case like when setting the checksum for a UDP tunnel.
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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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{
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struct udphdr *uh = udp_hdr(skb);
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if (nocheck)
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uh->check = 0;
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else if (skb_is_gso(skb))
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uh->check = ~udp_v6_check(len, saddr, daddr, 0);
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else if (skb->ip_summed == CHECKSUM_PARTIAL) {
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uh->check = 0;
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uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb));
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if (uh->check == 0)
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uh->check = CSUM_MANGLED_0;
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} else {
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skb->ip_summed = CHECKSUM_PARTIAL;
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skb->csum_start = skb_transport_header(skb) - skb->head;
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skb->csum_offset = offsetof(struct udphdr, check);
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uh->check = ~udp_v6_check(len, saddr, daddr, 0);
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}
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}
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EXPORT_SYMBOL(udp6_set_csum);
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