When fragmenting ipv4 packet, the data offset should be calculated through
the ihl field in ip header rather than using sizeof(struct rte_ipv4_hdr).
Fixes: 4c38e5532a07 ("ip_frag: refactor IPv4 fragmentation into a proper library")
Cc: anatoly.burakov@intel.com
Cc: stable@dpdk.org
Signed-off-by: Pu Xu <583493798@qq.com>
---
lib/librte_ip_frag/rte_ipv4_fragmentation.c | 34 +++++++++++++--------
1 file changed, 21 insertions(+), 13 deletions(-)
@@ -23,10 +23,10 @@
#define IPV4_HDR_FO_ALIGN (1 << RTE_IPV4_HDR_FO_SHIFT)
static inline void __fill_ipv4hdr_frag(struct rte_ipv4_hdr *dst,
- const struct rte_ipv4_hdr *src, uint16_t len, uint16_t fofs,
- uint16_t dofs, uint32_t mf)
+ const struct rte_ipv4_hdr *src, uint16_t header_len,
+ uint16_t len, uint16_t fofs, uint16_t dofs, uint32_t mf)
{
- rte_memcpy(dst, src, sizeof(*dst));
+ rte_memcpy(dst, src, header_len);
fofs = (uint16_t)(fofs + (dofs >> RTE_IPV4_HDR_FO_SHIFT));
fofs = (uint16_t)(fofs | mf << RTE_IPV4_HDR_MF_SHIFT);
dst->fragment_offset = rte_cpu_to_be_16(fofs);
@@ -74,7 +74,7 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
struct rte_ipv4_hdr *in_hdr;
uint32_t out_pkt_pos, in_seg_data_pos;
uint32_t more_in_segs;
- uint16_t fragment_offset, flag_offset, frag_size;
+ uint16_t fragment_offset, flag_offset, frag_size, header_len;
uint16_t frag_bytes_remaining;
/*
@@ -86,14 +86,22 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
unlikely(mtu_size < RTE_ETHER_MIN_MTU))
return -EINVAL;
+ in_hdr = rte_pktmbuf_mtod(pkt_in, struct rte_ipv4_hdr *);
+ header_len = (in_hdr->version_ihl & RTE_IPV4_HDR_IHL_MASK) *
+ RTE_IPV4_IHL_MULTIPLIER;
+
+ /* Check IP header length */
+ if (unlikely(pkt_in->data_len < header_len) ||
+ unlikely(mtu_size < header_len))
+ return -EINVAL;
+
/*
* Ensure the IP payload length of all fragments is aligned to a
* multiple of 8 bytes as per RFC791 section 2.3.
*/
- frag_size = RTE_ALIGN_FLOOR((mtu_size - sizeof(struct rte_ipv4_hdr)),
+ frag_size = RTE_ALIGN_FLOOR((mtu_size - header_len),
IPV4_HDR_FO_ALIGN);
- in_hdr = rte_pktmbuf_mtod(pkt_in, struct rte_ipv4_hdr *);
flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
/* If Don't Fragment flag is set */
@@ -102,11 +110,11 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
/* Check that pkts_out is big enough to hold all fragments */
if (unlikely(frag_size * nb_pkts_out <
- (uint16_t)(pkt_in->pkt_len - sizeof(struct rte_ipv4_hdr))))
+ (uint16_t)(pkt_in->pkt_len - header_len)))
return -EINVAL;
in_seg = pkt_in;
- in_seg_data_pos = sizeof(struct rte_ipv4_hdr);
+ in_seg_data_pos = header_len;
out_pkt_pos = 0;
fragment_offset = 0;
@@ -124,8 +132,8 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
}
/* Reserve space for the IP header that will be built later */
- out_pkt->data_len = sizeof(struct rte_ipv4_hdr);
- out_pkt->pkt_len = sizeof(struct rte_ipv4_hdr);
+ out_pkt->data_len = header_len;
+ out_pkt->pkt_len = header_len;
frag_bytes_remaining = frag_size;
out_seg_prev = out_pkt;
@@ -176,14 +184,14 @@ rte_ipv4_fragment_packet(struct rte_mbuf *pkt_in,
out_hdr = rte_pktmbuf_mtod(out_pkt, struct rte_ipv4_hdr *);
- __fill_ipv4hdr_frag(out_hdr, in_hdr,
+ __fill_ipv4hdr_frag(out_hdr, in_hdr, header_len,
(uint16_t)out_pkt->pkt_len,
flag_offset, fragment_offset, more_in_segs);
fragment_offset = (uint16_t)(fragment_offset +
- out_pkt->pkt_len - sizeof(struct rte_ipv4_hdr));
+ out_pkt->pkt_len - header_len);
- out_pkt->l3_len = sizeof(struct rte_ipv4_hdr);
+ out_pkt->l3_len = header_len;
/* Write the fragment to the output list */
pkts_out[out_pkt_pos] = out_pkt;