diff options
Diffstat (limited to 'src/extra/ipv6.c')
| -rw-r--r-- | src/extra/ipv6.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/extra/ipv6.c b/src/extra/ipv6.c index f685b3b..6e8820c 100644 --- a/src/extra/ipv6.c +++ b/src/extra/ipv6.c @@ -117,6 +117,35 @@ int nfq_ip6_set_transport_header(struct pkt_buff *pktb, struct ip6_hdr *ip6h, } /** + * nfq_ip6_mangle - mangle IPv6 packet buffer + * \param pktb: Pointer to user-space network packet buffer + * \param dataoff: Offset to layer 4 header + * \param match_offset: Offset to content that you want to mangle + * \param match_len: Length of the existing content you want to mangle + * \param rep_buffer: Pointer to data you want to use to replace current content + * \param rep_len: Length of data you want to use to replace current content + * \returns 1 for success and 0 for failure. See pktb_mangle() for failure case + * \note This function updates the IPv6 length (if necessary) + */ +EXPORT_SYMBOL +int nfq_ip6_mangle(struct pkt_buff *pktb, unsigned int dataoff, + unsigned int match_offset, unsigned int match_len, + const char *rep_buffer, unsigned int rep_len) +{ + struct ip6_hdr *ip6h = (struct ip6_hdr *)pktb->network_header; + + if (!pktb_mangle(pktb, dataoff, match_offset, match_len, rep_buffer, + rep_len)) + return 0; + + /* Fix IPv6 hdr length information */ + ip6h->ip6_plen = + htons(pktb->tail - pktb->network_header - sizeof *ip6h); + + return 1; +} + +/** * nfq_ip6_snprintf - print IPv6 header into one buffer in iptables LOG format * \param buf: Pointer to buffer that is used to print the object * \param size: Size of the buffer (or remaining room in it). |