diff options
Diffstat (limited to 'include/net/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index d383c895592a..03f3af02a9a6 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -500,6 +500,39 @@ static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb) return jhdr->nexthdr; } +/* Return 0 if HBH header is successfully removed + * Or if HBH removal is unnecessary (packet is not big TCP) + * Return error to indicate dropping the packet + */ +static inline int ipv6_hopopt_jumbo_remove(struct sk_buff *skb) +{ + const int hophdr_len = sizeof(struct hop_jumbo_hdr); + int nexthdr = ipv6_has_hopopt_jumbo(skb); + struct ipv6hdr *h6; + + if (!nexthdr) + return 0; + + if (skb_cow_head(skb, 0)) + return -1; + + /* Remove the HBH header. + * Layout: [Ethernet header][IPv6 header][HBH][L4 Header] + */ + memmove(skb_mac_header(skb) + hophdr_len, skb_mac_header(skb), + skb_network_header(skb) - skb_mac_header(skb) + + sizeof(struct ipv6hdr)); + + __skb_pull(skb, hophdr_len); + skb->network_header += hophdr_len; + skb->mac_header += hophdr_len; + + h6 = ipv6_hdr(skb); + h6->nexthdr = nexthdr; + + return 0; +} + static inline bool ipv6_accept_ra(struct inet6_dev *idev) { /* If forwarding is enabled, RA are not accepted unless the special |