diff options
Diffstat (limited to 'net/mpls/internal.h')
| -rw-r--r-- | net/mpls/internal.h | 45 |
1 files changed, 30 insertions, 15 deletions
diff --git a/net/mpls/internal.h b/net/mpls/internal.h index 2ac97433c3b7..cc324c022049 100644 --- a/net/mpls/internal.h +++ b/net/mpls/internal.h @@ -64,7 +64,6 @@ struct mpls_dev { struct sk_buff; #define LABEL_NOT_SPECIFIED (1 << 20) -#define MAX_NEW_LABELS 2 /* This maximum ha length copied from the definition of struct neighbour */ #define VIA_ALEN_ALIGN sizeof(unsigned long) @@ -88,12 +87,26 @@ struct mpls_nh { /* next hop label forwarding entry */ * modified handling netdev events with rtnl lock held */ unsigned int nh_flags; - u32 nh_label[MAX_NEW_LABELS]; 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, @@ -108,16 +121,16 @@ enum mpls_ttl_propagation { * +----------------------+ * | mpls_nh 0 | * +----------------------+ - * | ... | - * +----------------------+ - * | mpls_nh n-1 | - * +----------------------+ - * | alignment padding | + * | 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 | * +----------------------+ */ @@ -128,26 +141,28 @@ struct mpls_route { /* next hop label forwarding entry */ 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; - u16 rt_reserved1; + 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; \ - for (nhsel = 0, nh = (rt)->rt_nh; \ + 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++, nhsel++) + __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++) #define change_nexthops(rt) { \ - int nhsel; struct mpls_nh *nh; \ - for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \ + 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++, nhsel++) + __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++) #define endfor_nexthops(rt) } |