2 * IPv6 library code, needed by static components when full IPv6 support is
3 * not configured or static. These functions are needed by GSO/GRO implementation.
5 #include <linux/export.h>
7 #include <net/ip6_fib.h>
8 #include <net/addrconf.h>
9 #include <net/secure_seq.h>
11 int ip6_find_1stfragopt(struct sk_buff
*skb
, u8
**nexthdr
)
13 u16 offset
= sizeof(struct ipv6hdr
);
14 struct ipv6_opt_hdr
*exthdr
=
15 (struct ipv6_opt_hdr
*)(ipv6_hdr(skb
) + 1);
16 unsigned int packet_len
= skb_tail_pointer(skb
) -
17 skb_network_header(skb
);
19 *nexthdr
= &ipv6_hdr(skb
)->nexthdr
;
21 while (offset
+ 1 <= packet_len
) {
31 #if IS_ENABLED(CONFIG_IPV6_MIP6)
32 if (ipv6_find_tlv(skb
, offset
, IPV6_TLV_HAO
) >= 0)
42 offset
+= ipv6_optlen(exthdr
);
43 *nexthdr
= &exthdr
->nexthdr
;
44 exthdr
= (struct ipv6_opt_hdr
*)(skb_network_header(skb
) +
50 EXPORT_SYMBOL(ip6_find_1stfragopt
);
52 #if IS_ENABLED(CONFIG_IPV6)
53 int ip6_dst_hoplimit(struct dst_entry
*dst
)
55 int hoplimit
= dst_metric_raw(dst
, RTAX_HOPLIMIT
);
57 struct net_device
*dev
= dst
->dev
;
58 struct inet6_dev
*idev
;
61 idev
= __in6_dev_get(dev
);
63 hoplimit
= idev
->cnf
.hop_limit
;
65 hoplimit
= dev_net(dev
)->ipv6
.devconf_all
->hop_limit
;
70 EXPORT_SYMBOL(ip6_dst_hoplimit
);
73 int __ip6_local_out(struct sk_buff
*skb
)
77 len
= skb
->len
- sizeof(struct ipv6hdr
);
78 if (len
> IPV6_MAXPLEN
)
80 ipv6_hdr(skb
)->payload_len
= htons(len
);
81 IP6CB(skb
)->nhoff
= offsetof(struct ipv6hdr
, nexthdr
);
83 return nf_hook(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
,
84 skb_dst(skb
)->dev
, dst_output
);
86 EXPORT_SYMBOL_GPL(__ip6_local_out
);
88 int ip6_local_out(struct sk_buff
*skb
)
92 err
= __ip6_local_out(skb
);
94 err
= dst_output(skb
);
98 EXPORT_SYMBOL_GPL(ip6_local_out
);
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