Commit | Line | Data |
---|---|---|
3c73a036 VY |
1 | /* |
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. | |
4 | */ | |
5 | #include <linux/export.h> | |
6 | #include <net/ipv6.h> | |
7 | #include <net/ip6_fib.h> | |
3ce9b35f | 8 | #include <net/addrconf.h> |
3c73a036 VY |
9 | |
10 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) | |
11 | { | |
12 | static atomic_t ipv6_fragmentation_id; | |
13 | int old, new; | |
14 | ||
15 | #if IS_ENABLED(CONFIG_IPV6) | |
16 | if (rt && !(rt->dst.flags & DST_NOPEER)) { | |
17 | struct inet_peer *peer; | |
18 | struct net *net; | |
19 | ||
20 | net = dev_net(rt->dst.dev); | |
21 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); | |
22 | if (peer) { | |
23 | fhdr->identification = htonl(inet_getid(peer, 0)); | |
24 | inet_putpeer(peer); | |
25 | return; | |
26 | } | |
27 | } | |
28 | #endif | |
29 | do { | |
30 | old = atomic_read(&ipv6_fragmentation_id); | |
31 | new = old + 1; | |
32 | if (!new) | |
33 | new = 1; | |
34 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); | |
35 | fhdr->identification = htonl(new); | |
36 | } | |
37 | EXPORT_SYMBOL(ipv6_select_ident); | |
38 | ||
39 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
40 | { | |
41 | u16 offset = sizeof(struct ipv6hdr); | |
42 | struct ipv6_opt_hdr *exthdr = | |
43 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
29a3cad5 SH |
44 | unsigned int packet_len = skb_tail_pointer(skb) - |
45 | skb_network_header(skb); | |
3c73a036 VY |
46 | int found_rhdr = 0; |
47 | *nexthdr = &ipv6_hdr(skb)->nexthdr; | |
48 | ||
49 | while (offset + 1 <= packet_len) { | |
50 | ||
51 | switch (**nexthdr) { | |
52 | ||
53 | case NEXTHDR_HOP: | |
54 | break; | |
55 | case NEXTHDR_ROUTING: | |
56 | found_rhdr = 1; | |
57 | break; | |
58 | case NEXTHDR_DEST: | |
59 | #if IS_ENABLED(CONFIG_IPV6_MIP6) | |
60 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) | |
61 | break; | |
62 | #endif | |
63 | if (found_rhdr) | |
64 | return offset; | |
65 | break; | |
66 | default : | |
67 | return offset; | |
68 | } | |
69 | ||
70 | offset += ipv6_optlen(exthdr); | |
71 | *nexthdr = &exthdr->nexthdr; | |
72 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + | |
73 | offset); | |
74 | } | |
75 | ||
76 | return offset; | |
77 | } | |
78 | EXPORT_SYMBOL(ip6_find_1stfragopt); | |
3ce9b35f CW |
79 | |
80 | #if IS_ENABLED(CONFIG_IPV6) | |
81 | int ip6_dst_hoplimit(struct dst_entry *dst) | |
82 | { | |
83 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
84 | if (hoplimit == 0) { | |
85 | struct net_device *dev = dst->dev; | |
86 | struct inet6_dev *idev; | |
87 | ||
88 | rcu_read_lock(); | |
89 | idev = __in6_dev_get(dev); | |
90 | if (idev) | |
91 | hoplimit = idev->cnf.hop_limit; | |
92 | else | |
93 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; | |
94 | rcu_read_unlock(); | |
95 | } | |
96 | return hoplimit; | |
97 | } | |
98 | EXPORT_SYMBOL(ip6_dst_hoplimit); | |
99 | #endif |