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202 lines
5.3 KiB
C
202 lines
5.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MPLS_INTERNAL_H
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#define MPLS_INTERNAL_H
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#include <net/mpls.h>
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/* put a reasonable limit on the number of labels
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* we will accept from userspace
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*/
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#define MAX_NEW_LABELS 30
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struct mpls_entry_decoded {
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u32 label;
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u8 ttl;
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u8 tc;
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u8 bos;
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};
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struct mpls_pcpu_stats {
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struct mpls_link_stats stats;
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struct u64_stats_sync syncp;
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};
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struct mpls_dev {
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int input_enabled;
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struct net_device *dev;
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struct mpls_pcpu_stats __percpu *stats;
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struct ctl_table_header *sysctl;
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struct rcu_head rcu;
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};
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#if BITS_PER_LONG == 32
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#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \
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do { \
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__typeof__(*(mdev)->stats) *ptr = \
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raw_cpu_ptr((mdev)->stats); \
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local_bh_disable(); \
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u64_stats_update_begin(&ptr->syncp); \
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ptr->stats.pkts_field++; \
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ptr->stats.bytes_field += (len); \
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u64_stats_update_end(&ptr->syncp); \
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local_bh_enable(); \
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} while (0)
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#define MPLS_INC_STATS(mdev, field) \
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do { \
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__typeof__(*(mdev)->stats) *ptr = \
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raw_cpu_ptr((mdev)->stats); \
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local_bh_disable(); \
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u64_stats_update_begin(&ptr->syncp); \
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ptr->stats.field++; \
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u64_stats_update_end(&ptr->syncp); \
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local_bh_enable(); \
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} while (0)
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#else
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#define MPLS_INC_STATS_LEN(mdev, len, pkts_field, bytes_field) \
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do { \
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this_cpu_inc((mdev)->stats->stats.pkts_field); \
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this_cpu_add((mdev)->stats->stats.bytes_field, (len)); \
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} while (0)
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#define MPLS_INC_STATS(mdev, field) \
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this_cpu_inc((mdev)->stats->stats.field)
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#endif
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struct sk_buff;
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#define LABEL_NOT_SPECIFIED (1 << 20)
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/* This maximum ha length copied from the definition of struct neighbour */
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#define VIA_ALEN_ALIGN sizeof(unsigned long)
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#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
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enum mpls_payload_type {
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MPT_UNSPEC, /* IPv4 or IPv6 */
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MPT_IPV4 = 4,
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MPT_IPV6 = 6,
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/* Other types not implemented:
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* - Pseudo-wire with or without control word (RFC4385)
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* - GAL (RFC5586)
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*/
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};
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struct mpls_nh { /* next hop label forwarding entry */
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struct net_device *nh_dev;
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/* nh_flags is accessed under RCU in the packet path; it is
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* modified handling netdev events with rtnl lock held
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*/
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unsigned int nh_flags;
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u8 nh_labels;
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u8 nh_via_alen;
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u8 nh_via_table;
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u8 nh_reserved1;
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u32 nh_label[];
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};
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/* offset of via from beginning of mpls_nh */
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#define MPLS_NH_VIA_OFF(num_labels) \
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ALIGN(sizeof(struct mpls_nh) + (num_labels) * sizeof(u32), \
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VIA_ALEN_ALIGN)
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/* all nexthops within a route have the same size based on the
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* max number of labels and max via length across all nexthops
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*/
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#define MPLS_NH_SIZE(num_labels, max_via_alen) \
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(MPLS_NH_VIA_OFF((num_labels)) + \
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ALIGN((max_via_alen), VIA_ALEN_ALIGN))
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enum mpls_ttl_propagation {
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MPLS_TTL_PROP_DEFAULT,
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MPLS_TTL_PROP_ENABLED,
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MPLS_TTL_PROP_DISABLED,
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};
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/* The route, nexthops and vias are stored together in the same memory
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* block:
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*
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* +----------------------+
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* | mpls_route |
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* +----------------------+
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* | mpls_nh 0 |
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* +----------------------+
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* | alignment padding | 4 bytes for odd number of labels
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* +----------------------+
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* | via[rt_max_alen] 0 |
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* +----------------------+
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* | alignment padding | via's aligned on sizeof(unsigned long)
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* +----------------------+
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* | ... |
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* +----------------------+
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* | mpls_nh n-1 |
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* +----------------------+
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* | via[rt_max_alen] n-1 |
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* +----------------------+
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*/
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struct mpls_route { /* next hop label forwarding entry */
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struct rcu_head rt_rcu;
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u8 rt_protocol;
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u8 rt_payload_type;
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u8 rt_max_alen;
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u8 rt_ttl_propagate;
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u8 rt_nhn;
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/* rt_nhn_alive is accessed under RCU in the packet path; it
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* is modified handling netdev events with rtnl lock held
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*/
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u8 rt_nhn_alive;
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u8 rt_nh_size;
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u8 rt_via_offset;
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u8 rt_reserved1;
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struct mpls_nh rt_nh[];
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};
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#define for_nexthops(rt) { \
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int nhsel; const struct mpls_nh *nh; \
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for (nhsel = 0, nh = (rt)->rt_nh; \
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nhsel < (rt)->rt_nhn; \
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nh = (void *)nh + (rt)->rt_nh_size, nhsel++)
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#define change_nexthops(rt) { \
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int nhsel; struct mpls_nh *nh; \
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for (nhsel = 0, nh = (rt)->rt_nh; \
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nhsel < (rt)->rt_nhn; \
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nh = (void *)nh + (rt)->rt_nh_size, nhsel++)
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#define endfor_nexthops(rt) }
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static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
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{
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struct mpls_entry_decoded result;
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unsigned entry = be32_to_cpu(hdr->label_stack_entry);
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result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
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result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
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result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
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result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
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return result;
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}
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static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev)
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{
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return rcu_dereference_rtnl(dev->mpls_ptr);
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}
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int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
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const u32 label[]);
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int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
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u32 label[], struct netlink_ext_ack *extack);
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bool mpls_output_possible(const struct net_device *dev);
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unsigned int mpls_dev_mtu(const struct net_device *dev);
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bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
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void mpls_stats_inc_outucastpkts(struct net_device *dev,
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const struct sk_buff *skb);
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#endif /* MPLS_INTERNAL_H */
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