Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3c73a036 VY |
2 | /* |
3 | * IPv6 library code, needed by static components when full IPv6 support is | |
4 | * not configured or static. These functions are needed by GSO/GRO implementation. | |
5 | */ | |
6 | #include <linux/export.h> | |
5188cd44 | 7 | #include <net/ip.h> |
3c73a036 VY |
8 | #include <net/ipv6.h> |
9 | #include <net/ip6_fib.h> | |
3ce9b35f | 10 | #include <net/addrconf.h> |
6dfac5c3 | 11 | #include <net/secure_seq.h> |
a263653e | 12 | #include <linux/netfilter.h> |
3c73a036 | 13 | |
df453700 | 14 | static u32 __ipv6_select_ident(struct net *net, |
fd0273d7 MKL |
15 | const struct in6_addr *dst, |
16 | const struct in6_addr *src) | |
0508c07f | 17 | { |
d247aabd | 18 | return get_random_u32_above(0); |
0508c07f VY |
19 | } |
20 | ||
0c19f846 WB |
21 | /* This function exists only for tap drivers that must support broken |
22 | * clients requesting UFO without specifying an IPv6 fragment ID. | |
23 | * | |
24 | * This is similar to ipv6_select_ident() but we use an independent hash | |
25 | * seed to limit information leakage. | |
26 | * | |
27 | * The network header must be set before calling this. | |
28 | */ | |
29 | __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb) | |
30 | { | |
0c19f846 WB |
31 | struct in6_addr buf[2]; |
32 | struct in6_addr *addrs; | |
33 | u32 id; | |
34 | ||
35 | addrs = skb_header_pointer(skb, | |
36 | skb_network_offset(skb) + | |
37 | offsetof(struct ipv6hdr, saddr), | |
38 | sizeof(buf), buf); | |
39 | if (!addrs) | |
40 | return 0; | |
41 | ||
df453700 | 42 | id = __ipv6_select_ident(net, &addrs[1], &addrs[0]); |
0c19f846 WB |
43 | return htonl(id); |
44 | } | |
45 | EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident); | |
46 | ||
7f159867 ED |
47 | __be32 ipv6_select_ident(struct net *net, |
48 | const struct in6_addr *daddr, | |
49 | const struct in6_addr *saddr) | |
0508c07f | 50 | { |
0508c07f VY |
51 | u32 id; |
52 | ||
df453700 | 53 | id = __ipv6_select_ident(net, daddr, saddr); |
286c2349 | 54 | return htonl(id); |
0508c07f VY |
55 | } |
56 | EXPORT_SYMBOL(ipv6_select_ident); | |
57 | ||
3c73a036 VY |
58 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
59 | { | |
6399f1fa | 60 | unsigned int offset = sizeof(struct ipv6hdr); |
29a3cad5 SH |
61 | unsigned int packet_len = skb_tail_pointer(skb) - |
62 | skb_network_header(skb); | |
3c73a036 VY |
63 | int found_rhdr = 0; |
64 | *nexthdr = &ipv6_hdr(skb)->nexthdr; | |
65 | ||
2423496a CG |
66 | while (offset <= packet_len) { |
67 | struct ipv6_opt_hdr *exthdr; | |
3c73a036 VY |
68 | |
69 | switch (**nexthdr) { | |
70 | ||
71 | case NEXTHDR_HOP: | |
72 | break; | |
73 | case NEXTHDR_ROUTING: | |
74 | found_rhdr = 1; | |
75 | break; | |
76 | case NEXTHDR_DEST: | |
77 | #if IS_ENABLED(CONFIG_IPV6_MIP6) | |
78 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) | |
79 | break; | |
80 | #endif | |
81 | if (found_rhdr) | |
82 | return offset; | |
83 | break; | |
67ba4152 | 84 | default: |
3c73a036 VY |
85 | return offset; |
86 | } | |
87 | ||
2423496a CG |
88 | if (offset + sizeof(struct ipv6_opt_hdr) > packet_len) |
89 | return -EINVAL; | |
90 | ||
3c73a036 VY |
91 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
92 | offset); | |
3de33e1b SB |
93 | offset += ipv6_optlen(exthdr); |
94 | if (offset > IPV6_MAXPLEN) | |
6399f1fa | 95 | return -EINVAL; |
2423496a | 96 | *nexthdr = &exthdr->nexthdr; |
3c73a036 VY |
97 | } |
98 | ||
2423496a | 99 | return -EINVAL; |
3c73a036 VY |
100 | } |
101 | EXPORT_SYMBOL(ip6_find_1stfragopt); | |
3ce9b35f CW |
102 | |
103 | #if IS_ENABLED(CONFIG_IPV6) | |
104 | int ip6_dst_hoplimit(struct dst_entry *dst) | |
105 | { | |
106 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
107 | if (hoplimit == 0) { | |
108 | struct net_device *dev = dst->dev; | |
109 | struct inet6_dev *idev; | |
110 | ||
111 | rcu_read_lock(); | |
112 | idev = __in6_dev_get(dev); | |
113 | if (idev) | |
114 | hoplimit = idev->cnf.hop_limit; | |
115 | else | |
116 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; | |
117 | rcu_read_unlock(); | |
118 | } | |
119 | return hoplimit; | |
120 | } | |
121 | EXPORT_SYMBOL(ip6_dst_hoplimit); | |
122 | #endif | |
788787b5 | 123 | |
cf91a99d | 124 | int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
788787b5 CW |
125 | { |
126 | int len; | |
127 | ||
128 | len = skb->len - sizeof(struct ipv6hdr); | |
129 | if (len > IPV6_MAXPLEN) | |
130 | len = 0; | |
131 | ipv6_hdr(skb)->payload_len = htons(len); | |
f6c20c59 | 132 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
788787b5 | 133 | |
a8e3e1a9 DA |
134 | /* if egress device is enslaved to an L3 master device pass the |
135 | * skb to its handler for processing | |
136 | */ | |
137 | skb = l3mdev_ip6_out(sk, skb); | |
138 | if (unlikely(!skb)) | |
139 | return 0; | |
140 | ||
b4e479a9 EC |
141 | skb->protocol = htons(ETH_P_IPV6); |
142 | ||
29a26a56 EB |
143 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
144 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
13206b6b | 145 | dst_output); |
788787b5 CW |
146 | } |
147 | EXPORT_SYMBOL_GPL(__ip6_local_out); | |
148 | ||
33224b16 | 149 | int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
788787b5 CW |
150 | { |
151 | int err; | |
152 | ||
cf91a99d | 153 | err = __ip6_local_out(net, sk, skb); |
788787b5 | 154 | if (likely(err == 1)) |
13206b6b | 155 | err = dst_output(net, sk, skb); |
788787b5 CW |
156 | |
157 | return err; | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(ip6_local_out); |