0621e6fc5e
Changed the is_gretap_dev and is_ip6gretap_dev logic from structure comparison to string comparison of the rtnl_link_ops kind field. This approach aligns with the current identification methods and function names of vxlan and geneve network devices. Convert mlxsw to use these helpers and use them in downstream mlx5 patch. Signed-off-by: Oz Shlomo <ozsh@mellanox.com> Reviewed-by: Eli Britstein <elibr@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_GRE_H
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#define __LINUX_GRE_H
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#include <linux/skbuff.h>
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#include <net/ip_tunnels.h>
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struct gre_base_hdr {
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__be16 flags;
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__be16 protocol;
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} __packed;
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struct gre_full_hdr {
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struct gre_base_hdr fixed_header;
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__be16 csum;
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__be16 reserved1;
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__be32 key;
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__be32 seq;
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} __packed;
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#define GRE_HEADER_SECTION 4
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#define GREPROTO_CISCO 0
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#define GREPROTO_PPTP 1
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#define GREPROTO_MAX 2
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#define GRE_IP_PROTO_MAX 2
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struct gre_protocol {
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int (*handler)(struct sk_buff *skb);
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void (*err_handler)(struct sk_buff *skb, u32 info);
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};
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int gre_add_protocol(const struct gre_protocol *proto, u8 version);
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int gre_del_protocol(const struct gre_protocol *proto, u8 version);
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struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
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u8 name_assign_type);
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int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
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bool *csum_err, __be16 proto, int nhs);
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static inline bool netif_is_gretap(const struct net_device *dev)
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{
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return dev->rtnl_link_ops &&
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!strcmp(dev->rtnl_link_ops->kind, "gretap");
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}
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static inline bool netif_is_ip6gretap(const struct net_device *dev)
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{
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return dev->rtnl_link_ops &&
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!strcmp(dev->rtnl_link_ops->kind, "ip6gretap");
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}
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static inline int gre_calc_hlen(__be16 o_flags)
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{
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int addend = 4;
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if (o_flags & TUNNEL_CSUM)
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addend += 4;
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if (o_flags & TUNNEL_KEY)
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addend += 4;
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if (o_flags & TUNNEL_SEQ)
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addend += 4;
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return addend;
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}
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static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
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{
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__be16 tflags = 0;
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if (flags & GRE_CSUM)
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tflags |= TUNNEL_CSUM;
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if (flags & GRE_ROUTING)
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tflags |= TUNNEL_ROUTING;
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if (flags & GRE_KEY)
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tflags |= TUNNEL_KEY;
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if (flags & GRE_SEQ)
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tflags |= TUNNEL_SEQ;
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if (flags & GRE_STRICT)
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tflags |= TUNNEL_STRICT;
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if (flags & GRE_REC)
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tflags |= TUNNEL_REC;
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if (flags & GRE_VERSION)
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tflags |= TUNNEL_VERSION;
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return tflags;
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}
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static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags)
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{
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__be16 flags = 0;
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if (tflags & TUNNEL_CSUM)
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flags |= GRE_CSUM;
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if (tflags & TUNNEL_ROUTING)
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flags |= GRE_ROUTING;
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if (tflags & TUNNEL_KEY)
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flags |= GRE_KEY;
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if (tflags & TUNNEL_SEQ)
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flags |= GRE_SEQ;
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if (tflags & TUNNEL_STRICT)
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flags |= GRE_STRICT;
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if (tflags & TUNNEL_REC)
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flags |= GRE_REC;
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if (tflags & TUNNEL_VERSION)
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flags |= GRE_VERSION;
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return flags;
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}
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static inline __sum16 gre_checksum(struct sk_buff *skb)
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{
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__wsum csum;
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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csum = lco_csum(skb);
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else
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csum = skb_checksum(skb, 0, skb->len, 0);
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return csum_fold(csum);
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}
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static inline void gre_build_header(struct sk_buff *skb, int hdr_len,
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__be16 flags, __be16 proto,
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__be32 key, __be32 seq)
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{
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struct gre_base_hdr *greh;
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skb_push(skb, hdr_len);
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skb_set_inner_protocol(skb, proto);
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skb_reset_transport_header(skb);
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greh = (struct gre_base_hdr *)skb->data;
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greh->flags = gre_tnl_flags_to_gre_flags(flags);
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greh->protocol = proto;
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if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
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__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
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if (flags & TUNNEL_SEQ) {
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*ptr = seq;
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ptr--;
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}
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if (flags & TUNNEL_KEY) {
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*ptr = key;
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ptr--;
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}
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if (flags & TUNNEL_CSUM &&
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!(skb_shinfo(skb)->gso_type &
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(SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
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*ptr = 0;
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*(__sum16 *)ptr = gre_checksum(skb);
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}
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}
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}
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#endif
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