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0fd0d0834f
We currently have a version of ipv6_skip_exthdr() which is identical to the main one with the addition of fragment reporting. We can propose our version for upstream and then use it directly without duplication. Signed-off-by: Jesse Gross <jesse@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
#include <linux/ipv6.h>
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#include <net/ipv6.h>
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/* This function is upstream but not the version which supplies the
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* fragment offset. We plan to propose the extended version.
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*/
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int rpl_ipv6_skip_exthdr(const struct sk_buff *skb, int start,
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u8 *nexthdrp, __be16 *frag_offp)
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{
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u8 nexthdr = *nexthdrp;
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*frag_offp = 0;
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while (ipv6_ext_hdr(nexthdr)) {
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struct ipv6_opt_hdr _hdr, *hp;
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int hdrlen;
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if (nexthdr == NEXTHDR_NONE)
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return -1;
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hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
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if (hp == NULL)
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return -1;
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if (nexthdr == NEXTHDR_FRAGMENT) {
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__be16 _frag_off, *fp;
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fp = skb_header_pointer(skb,
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start+offsetof(struct frag_hdr,
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frag_off),
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sizeof(_frag_off),
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&_frag_off);
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if (fp == NULL)
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return -1;
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*frag_offp = *fp;
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if (ntohs(*frag_offp) & ~0x7)
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break;
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hdrlen = 8;
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} else if (nexthdr == NEXTHDR_AUTH)
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hdrlen = (hp->hdrlen+2)<<2;
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else
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hdrlen = ipv6_optlen(hp);
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nexthdr = hp->nexthdr;
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start += hdrlen;
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}
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*nexthdrp = nexthdr;
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return start;
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}
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