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Avoid truncating unrecognised parameters when reporting them.

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This resulted in sending malformed packets.

Approved by:		re (kib@)
MFC after:		1 week
This commit is contained in:
Michael Tuexen 2018-10-07 15:13:47 +00:00
parent 20a2f77eec
commit 3535cdc43e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339221
1 changed files with 15 additions and 34 deletions
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49
sys/netinet/sctp_output.c
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@ -4983,7 +4983,6 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
struct sctp_paramhdr *phdr, params;
struct mbuf *mat, *op_err;
char tempbuf[SCTP_PARAM_BUFFER_SIZE];
int at, limit, pad_needed;
uint16_t ptype, plen, padded_size;
int err_at;
@ -5123,15 +5122,13 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
l_len = SCTP_MIN_V4_OVERHEAD;
#endif
l_len += sizeof(struct sctp_chunkhdr);
l_len += plen;
l_len += sizeof(struct sctp_paramhdr);
l_len += sizeof(struct sctp_gen_error_cause);
op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
if (op_err) {
SCTP_BUF_LEN(op_err) = 0;
/*
* pre-reserve space for ip
* and sctp header and
* chunk hdr
* Pre-reserve space for IP,
* SCTP, and chunk header.
*/
#ifdef INET6
SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
@ -5144,7 +5141,7 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
}
if (op_err) {
/* If we have space */
struct sctp_paramhdr s;
struct sctp_gen_error_cause cause;
if (err_at % 4) {
uint32_t cpthis = 0;
@ -5153,26 +5150,15 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
err_at += pad_needed;
}
s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
s.param_length = htons(sizeof(s) + plen);
m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
err_at += sizeof(s);
if (plen > sizeof(tempbuf)) {
plen = sizeof(tempbuf);
}
phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
if (phdr == NULL) {
cause.code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
cause.length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
m_copyback(op_err, err_at, sizeof(struct sctp_gen_error_cause), (caddr_t)&cause);
err_at += sizeof(struct sctp_gen_error_cause);
SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
if (SCTP_BUF_NEXT(op_err) == NULL) {
sctp_m_freem(op_err);
/*
* we are out of memory but
* we still need to have a
* look at what to do (the
* system is in trouble
* though).
*/
return (NULL);
}
m_copyback(op_err, err_at, plen, (caddr_t)phdr);
}
return (op_err);
break;
@ -5196,7 +5182,6 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
l_len = SCTP_MIN_V4_OVERHEAD;
#endif
l_len += sizeof(struct sctp_chunkhdr);
l_len += plen;
l_len += sizeof(struct sctp_paramhdr);
op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
if (op_err) {
@ -5222,14 +5207,11 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
err_at += pad_needed;
}
s.param_type = htons(SCTP_UNRECOG_PARAM);
s.param_length = htons(sizeof(s) + plen);
m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
err_at += sizeof(s);
if (plen > sizeof(tempbuf)) {
plen = sizeof(tempbuf);
}
phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
if (phdr == NULL) {
s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
err_at += sizeof(struct sctp_paramhdr);
SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
if (SCTP_BUF_NEXT(op_err) == NULL) {
sctp_m_freem(op_err);
/*
* we are out of memory but
@ -5241,7 +5223,6 @@ sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
op_err = NULL;
goto more_processing;
}
m_copyback(op_err, err_at, plen, (caddr_t)phdr);
err_at += plen;
}
}