| 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 | |
| Vlad Yasevich | 3c73a03 | 2012-11-15 08:49:20 +0000 | [diff] [blame] | 9 | |
| 10 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
| 11 | { |
| 12 | u16 offset = sizeof(struct ipv6hdr); |
| 13 | struct ipv6_opt_hdr *exthdr = |
| 14 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
| 15 | unsigned int packet_len = skb->tail - skb->network_header; |
| 16 | int found_rhdr = 0; |
| 17 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
| 18 | |
| 19 | while (offset + 1 <= packet_len) { |
| 20 | |
| 21 | switch (**nexthdr) { |
| 22 | |
| 23 | case NEXTHDR_HOP: |
| 24 | break; |
| 25 | case NEXTHDR_ROUTING: |
| 26 | found_rhdr = 1; |
| 27 | break; |
| 28 | case NEXTHDR_DEST: |
| 29 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| 30 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
| 31 | break; |
| 32 | #endif |
| 33 | if (found_rhdr) |
| 34 | return offset; |
| 35 | break; |
| 36 | default : |
| 37 | return offset; |
| 38 | } |
| 39 | |
| 40 | offset += ipv6_optlen(exthdr); |
| 41 | *nexthdr = &exthdr->nexthdr; |
| 42 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
| 43 | offset); |
| 44 | } |
| 45 | |
| 46 | return offset; |
| 47 | } |
| 48 | EXPORT_SYMBOL(ip6_find_1stfragopt); |