| Vlad Yasevich | 3c73a03 | 2012-11-15 08:49:20 +0000 | [diff] [blame] | 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> |
| 8 | |
| 9 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
| 10 | { |
| 11 | static atomic_t ipv6_fragmentation_id; |
| 12 | int old, new; |
| 13 | |
| 14 | #if IS_ENABLED(CONFIG_IPV6) |
| 15 | if (rt && !(rt->dst.flags & DST_NOPEER)) { |
| 16 | struct inet_peer *peer; |
| 17 | struct net *net; |
| 18 | |
| 19 | net = dev_net(rt->dst.dev); |
| 20 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
| 21 | if (peer) { |
| 22 | fhdr->identification = htonl(inet_getid(peer, 0)); |
| 23 | inet_putpeer(peer); |
| 24 | return; |
| 25 | } |
| 26 | } |
| 27 | #endif |
| 28 | do { |
| 29 | old = atomic_read(&ipv6_fragmentation_id); |
| 30 | new = old + 1; |
| 31 | if (!new) |
| 32 | new = 1; |
| 33 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); |
| 34 | fhdr->identification = htonl(new); |
| 35 | } |
| 36 | EXPORT_SYMBOL(ipv6_select_ident); |
| 37 | |
| 38 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
| 39 | { |
| 40 | u16 offset = sizeof(struct ipv6hdr); |
| 41 | struct ipv6_opt_hdr *exthdr = |
| 42 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
| 43 | unsigned int packet_len = skb->tail - skb->network_header; |
| 44 | int found_rhdr = 0; |
| 45 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
| 46 | |
| 47 | while (offset + 1 <= packet_len) { |
| 48 | |
| 49 | switch (**nexthdr) { |
| 50 | |
| 51 | case NEXTHDR_HOP: |
| 52 | break; |
| 53 | case NEXTHDR_ROUTING: |
| 54 | found_rhdr = 1; |
| 55 | break; |
| 56 | case NEXTHDR_DEST: |
| 57 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| 58 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
| 59 | break; |
| 60 | #endif |
| 61 | if (found_rhdr) |
| 62 | return offset; |
| 63 | break; |
| 64 | default : |
| 65 | return offset; |
| 66 | } |
| 67 | |
| 68 | offset += ipv6_optlen(exthdr); |
| 69 | *nexthdr = &exthdr->nexthdr; |
| 70 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
| 71 | offset); |
| 72 | } |
| 73 | |
| 74 | return offset; |
| 75 | } |
| 76 | EXPORT_SYMBOL(ip6_find_1stfragopt); |