Orange Pi5 kernel

 /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _INET_ECN_H_
#define _INET_ECN_H_
 
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
 
#include <net/inet_sock.h>
#include <net/dsfield.h>
 
enum {
<------>INET_ECN_NOT_ECT = 0,
<------>INET_ECN_ECT_1 = 1,
<------>INET_ECN_ECT_0 = 2,
<------>INET_ECN_CE = 3,
<------>INET_ECN_MASK = 3,
};
 
extern int sysctl_tunnel_ecn_log;
 
static inline int INET_ECN_is_ce(__u8 dsfield)
{
<------>return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
}
 
static inline int INET_ECN_is_not_ect(__u8 dsfield)
{
<------>return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
}
 
static inline int INET_ECN_is_capable(__u8 dsfield)
{
<------>return dsfield & INET_ECN_ECT_0;
}
 
/*
 * RFC 3168 9.1.1
 *  The full-functionality option for ECN encapsulation is to copy the
 *  ECN codepoint of the inside header to the outside header on
 *  encapsulation if the inside header is not-ECT or ECT, and to set the
 *  ECN codepoint of the outside header to ECT(0) if the ECN codepoint of
 *  the inside header is CE.
 */
static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
{
<------>outer &= ~INET_ECN_MASK;
<------>outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
<------><------><------><------><------>  INET_ECN_ECT_0;
<------>return outer;
}
 
static inline void INET_ECN_xmit(struct sock *sk)
{
<------>inet_sk(sk)->tos |= INET_ECN_ECT_0;
<------>if (inet6_sk(sk) != NULL)
<------><------>inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
}
 
static inline void INET_ECN_dontxmit(struct sock *sk)
{
<------>inet_sk(sk)->tos &= ~INET_ECN_MASK;
<------>if (inet6_sk(sk) != NULL)
<------><------>inet6_sk(sk)->tclass &= ~INET_ECN_MASK;
}
 
#define IP6_ECN_flow_init(label) do {		\
      (label) &= ~htonl(INET_ECN_MASK << 20);	\
    } while (0)
 
#define	IP6_ECN_flow_xmit(sk, label) do {				\
<------>if (INET_ECN_is_capable(inet6_sk(sk)->tclass))			\
<------><------>(label) |= htonl(INET_ECN_ECT_0 << 20);			\
    } while (0)
 
static inline int IP_ECN_set_ce(struct iphdr *iph)
{
<------>u32 check = (__force u32)iph->check;
<------>u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
 
<------>/*
<------> * After the last operation we have (in binary):
<------> * INET_ECN_NOT_ECT => 01
<------> * INET_ECN_ECT_1   => 10
<------> * INET_ECN_ECT_0   => 11
<------> * INET_ECN_CE      => 00
<------> */
<------>if (!(ecn & 2))
<------><------>return !ecn;
 
<------>/*
<------> * The following gives us:
<------> * INET_ECN_ECT_1 => check += htons(0xFFFD)
<------> * INET_ECN_ECT_0 => check += htons(0xFFFE)
<------> */
<------>check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);
 
<------>iph->check = (__force __sum16)(check + (check>=0xFFFF));
<------>iph->tos |= INET_ECN_CE;
<------>return 1;
}
 
static inline int IP_ECN_set_ect1(struct iphdr *iph)
{
<------>u32 check = (__force u32)iph->check;
 
<------>if ((iph->tos & INET_ECN_MASK) != INET_ECN_ECT_0)
<------><------>return 0;
 
<------>check += (__force u16)htons(0x1);
 
<------>iph->check = (__force __sum16)(check + (check>=0xFFFF));
<------>iph->tos ^= INET_ECN_MASK;
<------>return 1;
}
 
static inline void IP_ECN_clear(struct iphdr *iph)
{
<------>iph->tos &= ~INET_ECN_MASK;
}
 
static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner)
{
<------>dscp &= ~INET_ECN_MASK;
<------>ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
}
 
struct ipv6hdr;
 
/* Note:
 * IP_ECN_set_ce() has to tweak IPV4 checksum when setting CE,
 * meaning both changes have no effect on skb->csum if/when CHECKSUM_COMPLETE
 * In IPv6 case, no checksum compensates the change in IPv6 header,
 * so we have to update skb->csum.
 */
static inline int IP6_ECN_set_ce(struct sk_buff *skb, struct ipv6hdr *iph)
{
<------>__be32 from, to;
 
<------>if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
<------><------>return 0;
 
<------>from = *(__be32 *)iph;
<------>to = from | htonl(INET_ECN_CE << 20);
<------>*(__be32 *)iph = to;
<------>if (skb->ip_summed == CHECKSUM_COMPLETE)
<------><------>skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
<------><------><------><------>     (__force __wsum)to);
<------>return 1;
}
 
static inline int IP6_ECN_set_ect1(struct sk_buff *skb, struct ipv6hdr *iph)
{
<------>__be32 from, to;
 
<------>if ((ipv6_get_dsfield(iph) & INET_ECN_MASK) != INET_ECN_ECT_0)
<------><------>return 0;
 
<------>from = *(__be32 *)iph;
<------>to = from ^ htonl(INET_ECN_MASK << 20);
<------>*(__be32 *)iph = to;
<------>if (skb->ip_summed == CHECKSUM_COMPLETE)
<------><------>skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
<------><------><------><------>     (__force __wsum)to);
<------>return 1;
}
 
static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
{
<------>dscp &= ~INET_ECN_MASK;
<------>ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
}
 
static inline int INET_ECN_set_ce(struct sk_buff *skb)
{
<------>switch (skb_protocol(skb, true)) {
<------>case cpu_to_be16(ETH_P_IP):
<------><------>if (skb_network_header(skb) + sizeof(struct iphdr) <=
<------><------>    skb_tail_pointer(skb))
<------><------><------>return IP_ECN_set_ce(ip_hdr(skb));
<------><------>break;
 
<------>case cpu_to_be16(ETH_P_IPV6):
<------><------>if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
<------><------>    skb_tail_pointer(skb))
<------><------><------>return IP6_ECN_set_ce(skb, ipv6_hdr(skb));
<------><------>break;
<------>}
 
<------>return 0;
}
 
static inline int INET_ECN_set_ect1(struct sk_buff *skb)
{
<------>switch (skb_protocol(skb, true)) {
<------>case cpu_to_be16(ETH_P_IP):
<------><------>if (skb_network_header(skb) + sizeof(struct iphdr) <=
<------><------>    skb_tail_pointer(skb))
<------><------><------>return IP_ECN_set_ect1(ip_hdr(skb));
<------><------>break;
 
<------>case cpu_to_be16(ETH_P_IPV6):
<------><------>if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
<------><------>    skb_tail_pointer(skb))
<------><------><------>return IP6_ECN_set_ect1(skb, ipv6_hdr(skb));
<------><------>break;
<------>}
 
<------>return 0;
}
 
/*
 * RFC 6040 4.2
 *  To decapsulate the inner header at the tunnel egress, a compliant
 *  tunnel egress MUST set the outgoing ECN field to the codepoint at the
 *  intersection of the appropriate arriving inner header (row) and outer
 *  header (column) in Figure 4
 *
 *      +---------+------------------------------------------------+
 *      |Arriving |            Arriving Outer Header               |
 *      |   Inner +---------+------------+------------+------------+
 *      |  Header | Not-ECT | ECT(0)     | ECT(1)     |     CE     |
 *      +---------+---------+------------+------------+------------+
 *      | Not-ECT | Not-ECT |Not-ECT(!!!)|Not-ECT(!!!)| <drop>(!!!)|
 *      |  ECT(0) |  ECT(0) | ECT(0)     | ECT(1)     |     CE     |
 *      |  ECT(1) |  ECT(1) | ECT(1) (!) | ECT(1)     |     CE     |
 *      |    CE   |      CE |     CE     |     CE(!!!)|     CE     |
 *      +---------+---------+------------+------------+------------+
 *
 *             Figure 4: New IP in IP Decapsulation Behaviour
 *
 *  returns 0 on success
 *          1 if something is broken and should be logged (!!! above)
 *          2 if packet should be dropped
 */
static inline int __INET_ECN_decapsulate(__u8 outer, __u8 inner, bool *set_ce)
{
<------>if (INET_ECN_is_not_ect(inner)) {
<------><------>switch (outer & INET_ECN_MASK) {
<------><------>case INET_ECN_NOT_ECT:
<------><------><------>return 0;
<------><------>case INET_ECN_ECT_0:
<------><------>case INET_ECN_ECT_1:
<------><------><------>return 1;
<------><------>case INET_ECN_CE:
<------><------><------>return 2;
<------><------>}
<------>}
 
<------>*set_ce = INET_ECN_is_ce(outer);
<------>return 0;
}
 
static inline int INET_ECN_decapsulate(struct sk_buff *skb,
<------><------><------><------>       __u8 outer, __u8 inner)
{
<------>bool set_ce = false;
<------>int rc;
 
<------>rc = __INET_ECN_decapsulate(outer, inner, &set_ce);
<------>if (!rc) {
<------><------>if (set_ce)
<------><------><------>INET_ECN_set_ce(skb);
<------><------>else if ((outer & INET_ECN_MASK) == INET_ECN_ECT_1)
<------><------><------>INET_ECN_set_ect1(skb);
<------>}
 
<------>return rc;
}
 
static inline int IP_ECN_decapsulate(const struct iphdr *oiph,
<------><------><------><------>     struct sk_buff *skb)
{
<------>__u8 inner;
 
<------>switch (skb_protocol(skb, true)) {
<------>case htons(ETH_P_IP):
<------><------>inner = ip_hdr(skb)->tos;
<------><------>break;
<------>case htons(ETH_P_IPV6):
<------><------>inner = ipv6_get_dsfield(ipv6_hdr(skb));
<------><------>break;
<------>default:
<------><------>return 0;
<------>}
 
<------>return INET_ECN_decapsulate(skb, oiph->tos, inner);
}
 
static inline int IP6_ECN_decapsulate(const struct ipv6hdr *oipv6h,
<------><------><------><------>      struct sk_buff *skb)
{
<------>__u8 inner;
 
<------>switch (skb_protocol(skb, true)) {
<------>case htons(ETH_P_IP):
<------><------>inner = ip_hdr(skb)->tos;
<------><------>break;
<------>case htons(ETH_P_IPV6):
<------><------>inner = ipv6_get_dsfield(ipv6_hdr(skb));
<------><------>break;
<------>default:
<------><------>return 0;
<------>}
 
<------>return INET_ECN_decapsulate(skb, ipv6_get_dsfield(oipv6h), inner);
}
#endif

	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _INET_ECN_H_
	#define _INET_ECN_H_

	#include <linux/ip.h>
	#include <linux/skbuff.h>
	#include <linux/if_vlan.h>

	#include <net/inet_sock.h>
	#include <net/dsfield.h>

	enum {
	<------>INET_ECN_NOT_ECT = 0,
	<------>INET_ECN_ECT_1 = 1,
	<------>INET_ECN_ECT_0 = 2,
	<------>INET_ECN_CE = 3,
	<------>INET_ECN_MASK = 3,
	};

	extern int sysctl_tunnel_ecn_log;

	static inline int INET_ECN_is_ce(__u8 dsfield)
	{
	<------>return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
	}

	static inline int INET_ECN_is_not_ect(__u8 dsfield)
	{
	<------>return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
	}

	static inline int INET_ECN_is_capable(__u8 dsfield)
	{
	<------>return dsfield & INET_ECN_ECT_0;
	}

	/*
	* RFC 3168 9.1.1
	* The full-functionality option for ECN encapsulation is to copy the
	* ECN codepoint of the inside header to the outside header on
	* encapsulation if the inside header is not-ECT or ECT, and to set the
	* ECN codepoint of the outside header to ECT(0) if the ECN codepoint of
	* the inside header is CE.
	*/
	static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
	{
	<------>outer &= ~INET_ECN_MASK;
	<------>outer \|= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
	<------><------><------><------><------> INET_ECN_ECT_0;
	<------>return outer;
	}

	static inline void INET_ECN_xmit(struct sock *sk)
	{
	<------>inet_sk(sk)->tos \|= INET_ECN_ECT_0;
	<------>if (inet6_sk(sk) != NULL)
	<------><------>inet6_sk(sk)->tclass \|= INET_ECN_ECT_0;
	}

	static inline void INET_ECN_dontxmit(struct sock *sk)
	{
	<------>inet_sk(sk)->tos &= ~INET_ECN_MASK;
	<------>if (inet6_sk(sk) != NULL)
	<------><------>inet6_sk(sk)->tclass &= ~INET_ECN_MASK;
	}

	#define IP6_ECN_flow_init(label) do { \
	(label) &= ~htonl(INET_ECN_MASK << 20); \
	} while (0)

	#define IP6_ECN_flow_xmit(sk, label) do { \
	<------>if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \
	<------><------>(label) \|= htonl(INET_ECN_ECT_0 << 20); \
	} while (0)

	static inline int IP_ECN_set_ce(struct iphdr *iph)
	{
	<------>u32 check = (__force u32)iph->check;
	<------>u32 ecn = (iph->tos + 1) & INET_ECN_MASK;

	<------>/*
	<------> * After the last operation we have (in binary):
	<------> * INET_ECN_NOT_ECT => 01
	<------> * INET_ECN_ECT_1 => 10
	<------> * INET_ECN_ECT_0 => 11
	<------> * INET_ECN_CE => 00
	<------> */
	<------>if (!(ecn & 2))
	<------><------>return !ecn;

	<------>/*
	<------> * The following gives us:
	<------> * INET_ECN_ECT_1 => check += htons(0xFFFD)
	<------> * INET_ECN_ECT_0 => check += htons(0xFFFE)
	<------> */
	<------>check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);

	<------>iph->check = (__force __sum16)(check + (check>=0xFFFF));
	<------>iph->tos \|= INET_ECN_CE;
	<------>return 1;
	}

	static inline int IP_ECN_set_ect1(struct iphdr *iph)
	{
	<------>u32 check = (__force u32)iph->check;

	<------>if ((iph->tos & INET_ECN_MASK) != INET_ECN_ECT_0)
	<------><------>return 0;

	<------>check += (__force u16)htons(0x1);

	<------>iph->check = (__force __sum16)(check + (check>=0xFFFF));
	<------>iph->tos ^= INET_ECN_MASK;
	<------>return 1;
	}

	static inline void IP_ECN_clear(struct iphdr *iph)
	{
	<------>iph->tos &= ~INET_ECN_MASK;
	}

	static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner)
	{
	<------>dscp &= ~INET_ECN_MASK;
	<------>ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
	}

	struct ipv6hdr;

	/* Note:
	* IP_ECN_set_ce() has to tweak IPV4 checksum when setting CE,
	* meaning both changes have no effect on skb->csum if/when CHECKSUM_COMPLETE
	* In IPv6 case, no checksum compensates the change in IPv6 header,
	* so we have to update skb->csum.
	*/
	static inline int IP6_ECN_set_ce(struct sk_buff skb, struct ipv6hdr iph)
	{
	<------>__be32 from, to;

	<------>if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
	<------><------>return 0;

	<------>from = (__be32 )iph;
	<------>to = from \| htonl(INET_ECN_CE << 20);
	<------>(__be32 )iph = to;
	<------>if (skb->ip_summed == CHECKSUM_COMPLETE)
	<------><------>skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
	<------><------><------><------> (__force __wsum)to);
	<------>return 1;
	}

	static inline int IP6_ECN_set_ect1(struct sk_buff skb, struct ipv6hdr iph)
	{
	<------>__be32 from, to;

	<------>if ((ipv6_get_dsfield(iph) & INET_ECN_MASK) != INET_ECN_ECT_0)
	<------><------>return 0;

	<------>from = (__be32 )iph;
	<------>to = from ^ htonl(INET_ECN_MASK << 20);
	<------>(__be32 )iph = to;
	<------>if (skb->ip_summed == CHECKSUM_COMPLETE)
	<------><------>skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
	<------><------><------><------> (__force __wsum)to);
	<------>return 1;
	}

	static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
	{
	<------>dscp &= ~INET_ECN_MASK;
	<------>ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
	}

	static inline int INET_ECN_set_ce(struct sk_buff *skb)
	{
	<------>switch (skb_protocol(skb, true)) {
	<------>case cpu_to_be16(ETH_P_IP):
	<------><------>if (skb_network_header(skb) + sizeof(struct iphdr) <=
	<------><------> skb_tail_pointer(skb))
	<------><------><------>return IP_ECN_set_ce(ip_hdr(skb));
	<------><------>break;

	<------>case cpu_to_be16(ETH_P_IPV6):
	<------><------>if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
	<------><------> skb_tail_pointer(skb))
	<------><------><------>return IP6_ECN_set_ce(skb, ipv6_hdr(skb));
	<------><------>break;
	<------>}

	<------>return 0;
	}

	static inline int INET_ECN_set_ect1(struct sk_buff *skb)
	{
	<------>switch (skb_protocol(skb, true)) {
	<------>case cpu_to_be16(ETH_P_IP):
	<------><------>if (skb_network_header(skb) + sizeof(struct iphdr) <=
	<------><------> skb_tail_pointer(skb))
	<------><------><------>return IP_ECN_set_ect1(ip_hdr(skb));
	<------><------>break;

	<------>case cpu_to_be16(ETH_P_IPV6):
	<------><------>if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
	<------><------> skb_tail_pointer(skb))
	<------><------><------>return IP6_ECN_set_ect1(skb, ipv6_hdr(skb));
	<------><------>break;
	<------>}

	<------>return 0;
	}

	/*
	* RFC 6040 4.2
	* To decapsulate the inner header at the tunnel egress, a compliant
	* tunnel egress MUST set the outgoing ECN field to the codepoint at the
	* intersection of the appropriate arriving inner header (row) and outer
	* header (column) in Figure 4
	*
	* +---------+------------------------------------------------+
	* \|Arriving \| Arriving Outer Header \|
	* \| Inner +---------+------------+------------+------------+
	* \| Header \| Not-ECT \| ECT(0) \| ECT(1) \| CE \|
	* +---------+---------+------------+------------+------------+
	* \| Not-ECT \| Not-ECT \|Not-ECT(!!!)\|Not-ECT(!!!)\| <drop>(!!!)\|
	* \| ECT(0) \| ECT(0) \| ECT(0) \| ECT(1) \| CE \|
	* \| ECT(1) \| ECT(1) \| ECT(1) (!) \| ECT(1) \| CE \|
	* \| CE \| CE \| CE \| CE(!!!)\| CE \|
	* +---------+---------+------------+------------+------------+
	*
	* Figure 4: New IP in IP Decapsulation Behaviour
	*
	* returns 0 on success
	* 1 if something is broken and should be logged (!!! above)
	* 2 if packet should be dropped
	*/
	static inline int __INET_ECN_decapsulate(__u8 outer, __u8 inner, bool *set_ce)
	{
	<------>if (INET_ECN_is_not_ect(inner)) {
	<------><------>switch (outer & INET_ECN_MASK) {
	<------><------>case INET_ECN_NOT_ECT:
	<------><------><------>return 0;
	<------><------>case INET_ECN_ECT_0:
	<------><------>case INET_ECN_ECT_1:
	<------><------><------>return 1;
	<------><------>case INET_ECN_CE:
	<------><------><------>return 2;
	<------><------>}
	<------>}

	<------>*set_ce = INET_ECN_is_ce(outer);
	<------>return 0;
	}

	static inline int INET_ECN_decapsulate(struct sk_buff *skb,
	<------><------><------><------> __u8 outer, __u8 inner)
	{
	<------>bool set_ce = false;
	<------>int rc;

	<------>rc = __INET_ECN_decapsulate(outer, inner, &set_ce);
	<------>if (!rc) {
	<------><------>if (set_ce)
	<------><------><------>INET_ECN_set_ce(skb);
	<------><------>else if ((outer & INET_ECN_MASK) == INET_ECN_ECT_1)
	<------><------><------>INET_ECN_set_ect1(skb);
	<------>}

	<------>return rc;
	}

	static inline int IP_ECN_decapsulate(const struct iphdr *oiph,
	<------><------><------><------> struct sk_buff *skb)
	{
	<------>__u8 inner;

	<------>switch (skb_protocol(skb, true)) {
	<------>case htons(ETH_P_IP):
	<------><------>inner = ip_hdr(skb)->tos;
	<------><------>break;
	<------>case htons(ETH_P_IPV6):
	<------><------>inner = ipv6_get_dsfield(ipv6_hdr(skb));
	<------><------>break;
	<------>default:
	<------><------>return 0;
	<------>}

	<------>return INET_ECN_decapsulate(skb, oiph->tos, inner);
	}

	static inline int IP6_ECN_decapsulate(const struct ipv6hdr *oipv6h,
	<------><------><------><------> struct sk_buff *skb)
	{
	<------>__u8 inner;

	<------>switch (skb_protocol(skb, true)) {
	<------>case htons(ETH_P_IP):
	<------><------>inner = ip_hdr(skb)->tos;
	<------><------>break;
	<------>case htons(ETH_P_IPV6):
	<------><------>inner = ipv6_get_dsfield(ipv6_hdr(skb));
	<------><------>break;
	<------>default:
	<------><------>return 0;
	<------>}

	<------>return INET_ECN_decapsulate(skb, ipv6_get_dsfield(oipv6h), inner);
	}
	#endif