On 1/21/10 8:05 PM, John Baldwin wrote:
On Thursday 21 January 2010 1:33:35 pm Florian Smeets wrote:
On 1/21/10 6:58 PM, John Baldwin wrote:
On Thursday 21 January 2010 8:25:22 am Florian Smeets wrote:
(kgdb) frame 8
#8 0xc05f8b28 in ip_forward (m=0xc23dc900, srcrt=0) at
/usr/src/sys/netinet/ip_input.c:1307
1307 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
(kgdb) l
1302 mcopy = NULL;
1303 }
1304 if (mcopy != NULL) {
1305 mcopy->m_len = min(ip->ip_len, M_TRAILINGSPACE(mcopy));
1306 mcopy->m_pkthdr.len = mcopy->m_len;
1307 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1308 }
1309
1310 #ifdef IPSTEALTH
1311 if (!ipstealth) {
(kgdb) p *m
$1 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc271e80e
"E\020", mh_len = 164, mh_flags = 3, mh_type = 1, pad = "\000"}, M_dat =
{MH = {MH_pkthdr = {rcvif = 0xc20a4800, header = 0x0, len = 164,
csum_flags = 3072,
csum_data = 65535, tso_segsz = 0, ether_vtag = 0, tags =
{slh_first = 0xc35bc380}}, MH_dat = {MH_ext = {ext_buf = 0xc271e800 "",
ext_free = 0, ext_args = 0x0, ext_size = 2048, ref_cnt = 0xc2703ab4,
ext_type = 6},
MH_databuf =
"\000?q?\000\000\000\000\000\000\000\000\000\b\000\000?:p?
\006\000\000\000dL?\t<+?\202\200\020
O/\207\000\000\001\001\b\n-?b\230qms?\000\000\004\001?l?\000\000\001%r???
\200\000????\034?Ot?\b?{sr\000\034org.jboss.mq.ConnectionToken?\b&?
\237N\002\000\005I\000\004hashZ\000\asameJVML\000\bclientIDt\000\022Ljava/l\000\220\032Ae\207\000\002?
3...@\210d\021\000\001?
\001b\000!e\000\...@bv\000\000@2\032$W\213\n\034"...}},
M_databuf =
"\000H\n?\000\000\000\000?\000\000\000\000\f\000\000??
\000\000\000\000\000\000\200?[?\000?q?
\000\000\000\000\000\000\000\000\000\b\000\000?:p?\006\000\000\000dL?\t<+?
\202\200\020
O/\207\000\000\001\001\b\n-?b\230qms?\000\000\004\001?l?\000\000\001%r???
\200\000????\034?Ot?\b?{sr\000\034org.jboss.mq.ConnectionToken?\b&?
\237N\002\000\005I\000\004hashZ\000\asameJVML\000\bclientIDt\000\022Ljava/l\000\220\032Ae\207\000\002?
3"...}}
Ok, can you do 'p *m_copy'?
What ever you want :-)
(kgdb) p *m_copy
No symbol "m_copy" in current context.
(kgdb) p *m_copydata
$2 = {void (const struct mbuf *, int, int, caddr_t)} 0xc0572e10<m_copydata>
(kgdb) p *mcopy
$1 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc23cce34
"E\020", mh_len = 204, mh_flags = 2, mh_type = 1, pad = "\000"}, M_dat =
{MH = {MH_pkthdr = {rcvif = 0xc20a4800, header = 0x0,
len = 204, csum_flags = 3072, csum_data = 65535, tso_segsz = 0,
ether_vtag = 0, tags = {slh_first = 0xc23c3e00}}, MH_dat = {MH_ext =
{ext_buf = 0x84001045<Address 0x84001045 out of bounds>,
Hmm, ok. Can you do 'p *ip'? mcopy->m_len (204) is larger than m->m_len
(164). That shouldn't be the case unless ip->ip_len is somehow larger than m-
m_len.
(kgdb) p *ip
$3 = {ip_hl = 5, ip_v = 4, ip_tos = 16 '\020', ip_len = 33792, ip_id =
61492, ip_off = 64, ip_ttl = 64 '@', ip_p = 6 '\006', ip_sum = 34849,
ip_src = {s_addr = 355576000}, ip_dst = {
s_addr = 2251401408}}
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