Release 4.14 net/mpls/internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef MPLS_INTERNAL_H

#define MPLS_INTERNAL_H
#include <net/mpls.h>

/* put a reasonable limit on the number of labels
 * we will accept from userspace
 */

#define MAX_NEW_LABELS 30


struct mpls_entry_decoded {
	
u32 label;
	
u8 ttl;
	
u8 tc;
	
u8 bos;
};


struct mpls_pcpu_stats {
	
struct mpls_link_stats	stats;
	
struct u64_stats_sync	syncp;
};


struct mpls_dev {
	
int				input_enabled;
	
struct net_device		*dev;
	
struct mpls_pcpu_stats __percpu	*stats;

	
struct ctl_table_header		*sysctl;
	
struct rcu_head			rcu;
};

#if BITS_PER_LONG == 32


#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field)		\
	do {                                                            \
                __typeof__(*(mdev)->stats) *ptr =                       \
                        raw_cpu_ptr((mdev)->stats);                     \
                local_bh_disable();                                     \
                u64_stats_update_begin(&ptr->syncp);                    \
                ptr->stats.pkts_field++;                                \
                ptr->stats.bytes_field += (len);                        \
                u64_stats_update_end(&ptr->syncp);                      \
                local_bh_enable();                                      \
        } while (0)


#define MPLS_INC_STATS(mdev, field)					\
	do {                                                            \
                __typeof__(*(mdev)->stats) *ptr =                       \
                        raw_cpu_ptr((mdev)->stats);                     \
                local_bh_disable();                                     \
                u64_stats_update_begin(&ptr->syncp);                    \
                ptr->stats.field++;                                     \
                u64_stats_update_end(&ptr->syncp);                      \
                local_bh_enable();                                      \
        } while (0)

#else


#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field)		\
	do {                                                            \
                this_cpu_inc((mdev)->stats->stats.pkts_field);          \
                this_cpu_add((mdev)->stats->stats.bytes_field, (len));  \
        } while (0)


#define MPLS_INC_STATS(mdev, field)			\
	this_cpu_inc((mdev)->stats->stats.field)

#endif

struct sk_buff;


#define LABEL_NOT_SPECIFIED (1 << 20)

/* This maximum ha length copied from the definition of struct neighbour */

#define VIA_ALEN_ALIGN sizeof(unsigned long)

#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))


enum mpls_payload_type {
	
MPT_UNSPEC, /* IPv4 or IPv6 */
	
MPT_IPV4 = 4,
	
MPT_IPV6 = 6,

	/* Other types not implemented:
         *  - Pseudo-wire with or without control word (RFC4385)
         *  - GAL (RFC5586)
         */
};


struct mpls_nh { /* next hop label forwarding entry */
	
struct net_device __rcu *nh_dev;

	/* nh_flags is accessed under RCU in the packet path; it is
         * modified handling netdev events with rtnl lock held
         */
	
unsigned int		nh_flags;
	
u8			nh_labels;
	
u8			nh_via_alen;
	
u8			nh_via_table;
	
u8			nh_reserved1;

	
u32			nh_label[0];
};

/* offset of via from beginning of mpls_nh */

#define MPLS_NH_VIA_OFF(num_labels) \
		ALIGN(sizeof(struct mpls_nh) + (num_labels) * sizeof(u32), \
                      VIA_ALEN_ALIGN)

/* all nexthops within a route have the same size based on the
 * max number of labels and max via length across all nexthops
 */

#define MPLS_NH_SIZE(num_labels, max_via_alen)		\
		(MPLS_NH_VIA_OFF((num_labels)) +        \
                ALIGN((max_via_alen), VIA_ALEN_ALIGN))


enum mpls_ttl_propagation {
	
MPLS_TTL_PROP_DEFAULT,
	
MPLS_TTL_PROP_ENABLED,
	
MPLS_TTL_PROP_DISABLED,
};

/* The route, nexthops and vias are stored together in the same memory
 * block:
 *
 * +----------------------+
 * | mpls_route           |
 * +----------------------+
 * | mpls_nh 0            |
 * +----------------------+
 * | alignment padding    |   4 bytes for odd number of labels
 * +----------------------+
 * | via[rt_max_alen] 0   |
 * +----------------------+
 * | alignment padding    |   via's aligned on sizeof(unsigned long)
 * +----------------------+
 * | ...                  |
 * +----------------------+
 * | mpls_nh n-1          |
 * +----------------------+
 * | via[rt_max_alen] n-1 |
 * +----------------------+
 */

struct mpls_route { /* next hop label forwarding entry */
	
struct rcu_head		rt_rcu;
	
u8			rt_protocol;
	
u8			rt_payload_type;
	
u8			rt_max_alen;
	
u8			rt_ttl_propagate;
	
u8			rt_nhn;
	/* rt_nhn_alive is accessed under RCU in the packet path; it
         * is modified handling netdev events with rtnl lock held
         */
	
u8			rt_nhn_alive;
	
u8			rt_nh_size;
	
u8			rt_via_offset;
	
u8			rt_reserved1;
	
struct mpls_nh		rt_nh[0];
};


#define for_nexthops(rt) {                                               \
        int nhsel; struct mpls_nh *nh;  u8 *__nh;                       \
        for (nhsel = 0, nh = (rt)->rt_nh, __nh = (u8 *)((rt)->rt_nh);   \
             nhsel < (rt)->rt_nhn;                                      \
             __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++)


#define change_nexthops(rt) {                                               \
        int nhsel; struct mpls_nh *nh; u8 *__nh;                        \
        for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh),           \
                        __nh = (u8 *)((rt)->rt_nh);                     \
             nhsel < (rt)->rt_nhn;                                      \
             __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++)


#define endfor_nexthops(rt) }



static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
{
	struct mpls_shim_hdr result;
	result.label_stack_entry =
		cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
			    (tc << MPLS_LS_TC_SHIFT) |
			    (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
			    (ttl << MPLS_LS_TTL_SHIFT));
	return result;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
64
100.00%
1
100.00%
Total
64
100.00%
1
100.00%



static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
{
	struct mpls_entry_decoded result;
	unsigned entry = be32_to_cpu(hdr->label_stack_entry);

	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	result.tc =  (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;

	return result;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
78
100.00%
1
100.00%
Total
78
100.00%
1
100.00%



static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev)
{
	return rcu_dereference_rtnl(dev->mpls_ptr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Shearman
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%

int nla_put_labels(struct sk_buff *skb, int attrtype,  u8 labels,
		   const u32 label[]);
int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
		   u32 label[], struct netlink_ext_ack *extack);
bool mpls_output_possible(const struct net_device *dev);
unsigned int mpls_dev_mtu(const struct net_device *dev);
bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
void mpls_stats_inc_outucastpkts(struct net_device *dev,
				 const struct sk_buff *skb);

#endif /* MPLS_INTERNAL_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
209
37.39%
2
10.00%
Robert Shearman
152
27.19%
6
30.00%
Roopa Prabhu
133
23.79%
3
15.00%
David Ahern
61
10.91%
7
35.00%
Jiri Benc
3
0.54%
1
5.00%
Greg Kroah-Hartman
1
0.18%
1
5.00%
Total
559
100.00%
20
100.00%
Directory: net/mpls

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.