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authorKonstantin Ananyev <konstantin.ananyev@intel.com>2018-11-05 12:18:57 +0000
committerThomas Monjalon <thomas@monjalon.net>2018-11-06 01:58:03 +0100
commit7f0983ee331c9f08dabdb5b7f555ddf399003dcf (patch)
treefa64a03a06f3230d3660549531e43deb05cf26ce /lib
parent7b178300accc661b7bbd47da93380106378dba1c (diff)
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ip_frag: check fragment length of incoming packet
Under some conditions ill-formed fragments might cause reassembly code to corrupt mbufs and/or crash. Let say the following fragments sequence: <ofs=0,len=100, flags=MF> <ofs=96,len=100, flags=MF> <ofs=200,len=0,flags=MF> <ofs=200,len=100,flags=0> can trigger the problem. To overcome such situation, added check that fragment length of incoming value is greater than zero. Fixes: 601e279df074 ("ip_frag: move fragmentation/reassembly headers into a library") Fixes: 4f1a8f633862 ("ip_frag: add IPv6 reassembly") Cc: stable@dpdk.org Reported-by: Ryan E Hall <ryan.e.hall@intel.com> Reported-by: Alexander V Gutkin <alexander.v.gutkin@intel.com> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/librte_ip_frag/rte_ipv4_reassembly.c22
-rw-r--r--lib/librte_ip_frag/rte_ipv6_reassembly.c28
2 files changed, 35 insertions, 15 deletions
diff --git a/lib/librte_ip_frag/rte_ipv4_reassembly.c b/lib/librte_ip_frag/rte_ipv4_reassembly.c
index 4956b99..1029b7a 100644
--- a/lib/librte_ip_frag/rte_ipv4_reassembly.c
+++ b/lib/librte_ip_frag/rte_ipv4_reassembly.c
@@ -36,8 +36,11 @@ ipv4_frag_reassemble(struct ip_frag_pkt *fp)
/* previous fragment found. */
if(fp->frags[i].ofs + fp->frags[i].len == ofs) {
+ RTE_ASSERT(curr_idx != i);
+
/* adjust start of the last fragment data. */
- rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
+ rte_pktmbuf_adj(m,
+ (uint16_t)(m->l2_len + m->l3_len));
rte_pktmbuf_chain(fp->frags[i].mb, m);
/* this mbuf should not be accessed directly */
@@ -96,14 +99,14 @@ ipv4_frag_reassemble(struct ip_frag_pkt *fp)
*/
struct rte_mbuf *
rte_ipv4_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
- struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
- struct ipv4_hdr *ip_hdr)
+ struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
+ struct ipv4_hdr *ip_hdr)
{
struct ip_frag_pkt *fp;
struct ip_frag_key key;
const unaligned_uint64_t *psd;
- uint16_t ip_len;
uint16_t flag_offset, ip_ofs, ip_flag;
+ int32_t ip_len;
flag_offset = rte_be_to_cpu_16(ip_hdr->fragment_offset);
ip_ofs = (uint16_t)(flag_offset & IPV4_HDR_OFFSET_MASK);
@@ -116,12 +119,11 @@ rte_ipv4_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
key.key_len = IPV4_KEYLEN;
ip_ofs *= IPV4_HDR_OFFSET_UNITS;
- ip_len = (uint16_t)(rte_be_to_cpu_16(ip_hdr->total_length) -
- mb->l3_len);
+ ip_len = rte_be_to_cpu_16(ip_hdr->total_length) - mb->l3_len;
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"mbuf: %p, tms: %" PRIu64
- ", key: <%" PRIx64 ", %#x>, ofs: %u, len: %u, flags: %#x\n"
+ ", key: <%" PRIx64 ", %#x>, ofs: %u, len: %d, flags: %#x\n"
"tbl: %p, max_cycles: %" PRIu64 ", entry_mask: %#x, "
"max_entries: %u, use_entries: %u\n\n",
__func__, __LINE__,
@@ -129,6 +131,12 @@ rte_ipv4_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
tbl, tbl->max_cycles, tbl->entry_mask, tbl->max_entries,
tbl->use_entries);
+ /* check that fragment length is greater then zero. */
+ if (ip_len <= 0) {
+ IP_FRAG_MBUF2DR(dr, mb);
+ return NULL;
+ }
+
/* try to find/add entry into the fragment's table. */
if ((fp = ip_frag_find(tbl, dr, &key, tms)) == NULL) {
IP_FRAG_MBUF2DR(dr, mb);
diff --git a/lib/librte_ip_frag/rte_ipv6_reassembly.c b/lib/librte_ip_frag/rte_ipv6_reassembly.c
index db249fe..855e3f7 100644
--- a/lib/librte_ip_frag/rte_ipv6_reassembly.c
+++ b/lib/librte_ip_frag/rte_ipv6_reassembly.c
@@ -59,8 +59,11 @@ ipv6_frag_reassemble(struct ip_frag_pkt *fp)
/* previous fragment found. */
if (fp->frags[i].ofs + fp->frags[i].len == ofs) {
+ RTE_ASSERT(curr_idx != i);
+
/* adjust start of the last fragment data. */
- rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
+ rte_pktmbuf_adj(m,
+ (uint16_t)(m->l2_len + m->l3_len));
rte_pktmbuf_chain(fp->frags[i].mb, m);
/* this mbuf should not be accessed directly */
@@ -135,12 +138,13 @@ ipv6_frag_reassemble(struct ip_frag_pkt *fp)
#define FRAG_OFFSET(x) (rte_cpu_to_be_16(x) >> 3)
struct rte_mbuf *
rte_ipv6_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
- struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
- struct ipv6_hdr *ip_hdr, struct ipv6_extension_fragment *frag_hdr)
+ struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
+ struct ipv6_hdr *ip_hdr, struct ipv6_extension_fragment *frag_hdr)
{
struct ip_frag_pkt *fp;
struct ip_frag_key key;
- uint16_t ip_len, ip_ofs;
+ uint16_t ip_ofs;
+ int32_t ip_len;
rte_memcpy(&key.src_dst[0], ip_hdr->src_addr, 16);
rte_memcpy(&key.src_dst[2], ip_hdr->dst_addr, 16);
@@ -151,15 +155,17 @@ rte_ipv6_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
ip_ofs = FRAG_OFFSET(frag_hdr->frag_data) * 8;
/*
- * as per RFC2460, payload length contains all extension headers as well.
- * since we don't support anything but frag headers, this is what we remove
- * from the payload len.
+ * as per RFC2460, payload length contains all extension headers
+ * as well.
+ * since we don't support anything but frag headers,
+ * this is what we remove from the payload len.
*/
ip_len = rte_be_to_cpu_16(ip_hdr->payload_len) - sizeof(*frag_hdr);
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"mbuf: %p, tms: %" PRIu64
- ", key: <" IPv6_KEY_BYTES_FMT ", %#x>, ofs: %u, len: %u, flags: %#x\n"
+ ", key: <" IPv6_KEY_BYTES_FMT ", %#x>, "
+ "ofs: %u, len: %d, flags: %#x\n"
"tbl: %p, max_cycles: %" PRIu64 ", entry_mask: %#x, "
"max_entries: %u, use_entries: %u\n\n",
__func__, __LINE__,
@@ -168,6 +174,12 @@ rte_ipv6_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
tbl, tbl->max_cycles, tbl->entry_mask, tbl->max_entries,
tbl->use_entries);
+ /* check that fragment length is greater then zero. */
+ if (ip_len <= 0) {
+ IP_FRAG_MBUF2DR(dr, mb);
+ return NULL;
+ }
+
/* try to find/add entry into the fragment's table. */
fp = ip_frag_find(tbl, dr, &key, tms);
if (fp == NULL) {