273 lines
6.3 KiB
C
273 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_DST_METADATA_H
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#define __NET_DST_METADATA_H 1
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#include <linux/skbuff.h>
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#include <net/ip_tunnels.h>
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#include <net/macsec.h>
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#include <net/dst.h>
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enum metadata_type {
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METADATA_IP_TUNNEL,
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METADATA_HW_PORT_MUX,
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METADATA_MACSEC,
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METADATA_XFRM,
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};
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struct hw_port_info {
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struct net_device *lower_dev;
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u32 port_id;
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};
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struct macsec_info {
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sci_t sci;
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};
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struct xfrm_md_info {
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u32 if_id;
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int link;
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};
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struct metadata_dst {
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struct dst_entry dst;
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enum metadata_type type;
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union {
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struct ip_tunnel_info tun_info;
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struct hw_port_info port_info;
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struct macsec_info macsec_info;
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struct xfrm_md_info xfrm_info;
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} u;
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};
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static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb)
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{
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struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
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if (md_dst && md_dst->dst.flags & DST_METADATA)
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return md_dst;
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return NULL;
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}
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static inline struct ip_tunnel_info *
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skb_tunnel_info(const struct sk_buff *skb)
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{
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struct metadata_dst *md_dst = skb_metadata_dst(skb);
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struct dst_entry *dst;
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if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
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return &md_dst->u.tun_info;
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dst = skb_dst(skb);
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if (dst && dst->lwtstate &&
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(dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
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dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
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return lwt_tun_info(dst->lwtstate);
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return NULL;
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}
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static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt)
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{
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return (struct xfrm_md_info *)lwt->data;
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}
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static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb)
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{
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struct metadata_dst *md_dst = skb_metadata_dst(skb);
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struct dst_entry *dst;
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if (md_dst && md_dst->type == METADATA_XFRM)
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return &md_dst->u.xfrm_info;
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dst = skb_dst(skb);
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if (dst && dst->lwtstate &&
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dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM)
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return lwt_xfrm_info(dst->lwtstate);
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return NULL;
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}
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static inline bool skb_valid_dst(const struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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return dst && !(dst->flags & DST_METADATA);
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}
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static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
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const struct sk_buff *skb_b)
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{
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const struct metadata_dst *a, *b;
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if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
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return 0;
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a = (const struct metadata_dst *) skb_dst(skb_a);
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b = (const struct metadata_dst *) skb_dst(skb_b);
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if (!a != !b || a->type != b->type)
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return 1;
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switch (a->type) {
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case METADATA_HW_PORT_MUX:
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return memcmp(&a->u.port_info, &b->u.port_info,
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sizeof(a->u.port_info));
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case METADATA_IP_TUNNEL:
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return memcmp(&a->u.tun_info, &b->u.tun_info,
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sizeof(a->u.tun_info) +
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a->u.tun_info.options_len);
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case METADATA_MACSEC:
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return memcmp(&a->u.macsec_info, &b->u.macsec_info,
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sizeof(a->u.macsec_info));
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case METADATA_XFRM:
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return memcmp(&a->u.xfrm_info, &b->u.xfrm_info,
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sizeof(a->u.xfrm_info));
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default:
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return 1;
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}
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}
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void metadata_dst_free(struct metadata_dst *);
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struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
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gfp_t flags);
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void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);
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struct metadata_dst __percpu *
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metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
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static inline struct metadata_dst *tun_rx_dst(int md_size)
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{
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struct metadata_dst *tun_dst;
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tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
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if (!tun_dst)
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return NULL;
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tun_dst->u.tun_info.options_len = 0;
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tun_dst->u.tun_info.mode = 0;
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return tun_dst;
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}
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static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
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{
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struct metadata_dst *md_dst = skb_metadata_dst(skb);
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int md_size;
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struct metadata_dst *new_md;
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if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
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return ERR_PTR(-EINVAL);
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md_size = md_dst->u.tun_info.options_len;
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new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
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if (!new_md)
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return ERR_PTR(-ENOMEM);
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memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
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sizeof(struct ip_tunnel_info) + md_size);
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#ifdef CONFIG_DST_CACHE
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/* Unclone the dst cache if there is one */
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if (new_md->u.tun_info.dst_cache.cache) {
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int ret;
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ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC);
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if (ret) {
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metadata_dst_free(new_md);
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return ERR_PTR(ret);
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}
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}
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#endif
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skb_dst_drop(skb);
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skb_dst_set(skb, &new_md->dst);
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return new_md;
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}
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static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
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{
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struct metadata_dst *dst;
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dst = tun_dst_unclone(skb);
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if (IS_ERR(dst))
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return NULL;
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return &dst->u.tun_info;
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}
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static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
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__be32 daddr,
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__u8 tos, __u8 ttl,
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__be16 tp_dst,
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__be16 flags,
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__be64 tunnel_id,
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int md_size)
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{
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struct metadata_dst *tun_dst;
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tun_dst = tun_rx_dst(md_size);
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if (!tun_dst)
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return NULL;
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ip_tunnel_key_init(&tun_dst->u.tun_info.key,
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saddr, daddr, tos, ttl,
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0, 0, tp_dst, tunnel_id, flags);
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return tun_dst;
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}
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static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
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__be16 flags,
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__be64 tunnel_id,
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int md_size)
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{
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const struct iphdr *iph = ip_hdr(skb);
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return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,
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0, flags, tunnel_id, md_size);
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}
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static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u8 tos, __u8 ttl,
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__be16 tp_dst,
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__be32 label,
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__be16 flags,
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__be64 tunnel_id,
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int md_size)
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{
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struct metadata_dst *tun_dst;
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struct ip_tunnel_info *info;
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tun_dst = tun_rx_dst(md_size);
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if (!tun_dst)
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return NULL;
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info = &tun_dst->u.tun_info;
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info->mode = IP_TUNNEL_INFO_IPV6;
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info->key.tun_flags = flags;
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info->key.tun_id = tunnel_id;
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info->key.tp_src = 0;
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info->key.tp_dst = tp_dst;
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info->key.u.ipv6.src = *saddr;
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info->key.u.ipv6.dst = *daddr;
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info->key.tos = tos;
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info->key.ttl = ttl;
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info->key.label = label;
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return tun_dst;
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}
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static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
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__be16 flags,
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__be64 tunnel_id,
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int md_size)
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{
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,
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ipv6_get_dsfield(ip6h), ip6h->hop_limit,
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0, ip6_flowlabel(ip6h), flags, tunnel_id,
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md_size);
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}
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#endif /* __NET_DST_METADATA_H */
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