projects / mirror_ubuntu-bionic-kernel.git / blame
| 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) | |
| e90c1483 | 16 | if (rt) { |
| 3c73a036 VY |
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 | |
| 788787b5 CW |
100 | |
| 101 | int __ip6_local_out(struct sk_buff *skb) | |
| 102 | { | |
| 103 | int len; | |
| 104 | ||
| 105 | len = skb->len - sizeof(struct ipv6hdr); | |
| 106 | if (len > IPV6_MAXPLEN) | |
| 107 | len = 0; | |
| 108 | ipv6_hdr(skb)->payload_len = htons(len); | |
| 109 | ||
| 110 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, | |
| 111 | skb_dst(skb)->dev, dst_output); | |
| 112 | } | |
| 113 | EXPORT_SYMBOL_GPL(__ip6_local_out); | |
| 114 | ||
| 115 | int ip6_local_out(struct sk_buff *skb) | |
| 116 | { | |
| 117 | int err; | |
| 118 | ||
| 119 | err = __ip6_local_out(skb); | |
| 120 | if (likely(err == 1)) | |
| 121 | err = dst_output(skb); | |
| 122 | ||
| 123 | return err; | |
| 124 | } | |
| 125 | EXPORT_SYMBOL_GPL(ip6_local_out); |