diff options
author | Duncan Roe <duncan_roe@optusnet.com.au> | 2019-12-20 16:53:48 +1100 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-12-30 12:32:04 +0100 |
commit | 535a79f002c95b9d37ebded4f34c3b225c4c738d (patch) | |
tree | f4adb21b5883a73467d9d8fe0032f54692cb9a79 /src/extra/ipv6.c | |
parent | c432a84f1b6a5fb4435f74408d11ed8f7672ec4b (diff) |
src: add mangle functions for IPv6, IPv6/TCP and IPv6/UDP
Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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). |