| 1 | |
| 2 | |
| 3 | * IPv6 library code, needed by static components when full IPv6 support is
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| 4 | * not configured or static. These functions are needed by GSO/GRO implementation.
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| 5 |
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| 6 | #include <linux/export.h>
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| 7 | #include <net/ip.h>
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| 8 | #include <net/ipv6.h>
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| 9 | #include <net/ip6_fib.h>
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| 10 | #include <net/addrconf.h>
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| 11 | #include <net/secure_seq.h>
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| 12 | #include <linux/netfilter.h>
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| 13 |
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| 14 | static u32 __ipv6_select_ident(struct net *net,
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| 15 | const struct in6_addr *dst,
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| 16 | const struct in6_addr *src)
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| 17 | {
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| 18 | return get_random_u32_above(0);
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| 19 | }
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| 20 |
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| 21 | |
| 22 | * clients requesting UFO without specifying an IPv6 fragment ID.
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| 23 | *
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| 24 | * This is similar to ipv6_select_ident() but we use an independent hash
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| 25 | * seed to limit information leakage.
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| 26 | *
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| 27 | * The network header must be set before calling this.
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| 28 |
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| 29 | __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb)
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| 30 | {
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| 31 | struct in6_addr buf[2];
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| 32 | struct in6_addr *addrs;
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| 33 | u32 id;
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| 34 |
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| 35 | addrs = skb_header_pointer(skb,
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| 36 | skb_network_offset(skb) +
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| 37 | offsetof(struct ipv6hdr, saddr),
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| 38 | sizeof(buf), buf);
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| 39 | if (!addrs)
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| 40 | return 0;
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| 41 |
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| 42 | id = __ipv6_select_ident(net, &addrs[1], &addrs[0]);
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| 43 | return htonl(id);
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| 44 | }
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| 45 |
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| 46 | __be32 ipv6_select_ident(struct net *net,
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| 47 | const struct in6_addr *daddr,
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| 48 | const struct in6_addr *saddr)
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| 49 | {
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| 50 | u32 id;
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| 51 |
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| 52 | id = __ipv6_select_ident(net, daddr, saddr);
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| 53 | return htonl(id);
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| 54 | }
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| 55 | EXPORT_SYMBOL(ipv6_select_ident);
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| 56 |
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| 57 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
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| 58 | {
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| 59 | unsigned int offset = sizeof(struct ipv6hdr);
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| 60 | unsigned int packet_len = skb_tail_pointer(skb) -
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| 61 | skb_network_header(skb);
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| 62 | int found_rhdr = 0;
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| 63 | *nexthdr = &ipv6_hdr(skb)->nexthdr;
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| 64 |
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| 65 | while (offset <= packet_len) {
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| 66 | struct ipv6_opt_hdr *exthdr;
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| 67 |
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| 68 | switch (**nexthdr) {
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| 69 |
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| 70 | case NEXTHDR_HOP:
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| 71 | break;
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| 72 | case NEXTHDR_ROUTING:
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| 73 | found_rhdr = 1;
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| 74 | break;
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| 75 | case NEXTHDR_DEST:
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| 76 | #if IS_ENABLED(CONFIG_IPV6_MIP6)
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| 77 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
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| 78 | break;
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| 79 | #endif
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| 80 | if (found_rhdr)
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| 81 | return offset;
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| 82 | break;
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| 83 | default:
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| 84 | return offset;
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| 85 | }
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| 86 |
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| 87 | if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
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| 88 | return -EINVAL;
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| 89 |
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| 90 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
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| 91 | offset);
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| 92 | offset += ipv6_optlen(exthdr);
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| 93 | if (offset > IPV6_MAXPLEN)
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| 94 | return -EINVAL;
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| 95 | *nexthdr = &exthdr->nexthdr;
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| 96 | }
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| 97 |
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| 98 | return -EINVAL;
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| 99 | }
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| 100 | EXPORT_SYMBOL(ip6_find_1stfragopt);
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| 101 |
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| 102 | int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
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| 103 | {
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| 104 | ipv6_set_payload_len(ipv6_hdr(skb), skb->len - sizeof(struct ipv6hdr));
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| 105 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
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| 106 |
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| 107 | |
| 108 | * skb to its handler for processing
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| 109 |
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| 110 | skb = l3mdev_ip6_out(sk, skb);
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| 111 | if (unlikely(!skb))
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| 112 | return 0;
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| 113 |
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| 114 | skb->protocol = htons(ETH_P_IPV6);
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| 115 |
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| 116 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
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| 117 | net, sk, skb, NULL, skb_dst_dev(skb),
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| 118 | dst_output);
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| 119 | }
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| 120 | EXPORT_SYMBOL_GPL(__ip6_local_out);
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| 121 |
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| 122 | int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
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| 123 | {
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| 124 | int err;
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| 125 |
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| 126 | err = __ip6_local_out(net, sk, skb);
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| 127 | if (likely(err == 1))
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| 128 | err = dst_output(net, sk, skb);
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| 129 |
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| 130 | return err;
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| 131 | }
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| 132 | EXPORT_SYMBOL_GPL(ip6_local_out);
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