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202 lines
5.3 KiB
202 lines
5.3 KiB
/* 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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