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dummymbuf: add 'enlarge'

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Teach dummymbuf to replace mbufs with larger ones.
This can be useful for testing for bugs that depend on mbuf layout.

Sponsored by:	Rubicon Communications, LLC ("Netgate")
This commit is contained in:
Kristof Provost 2025-01-06 11:39:32 +01:00
parent 5d28f4cab8
commit 76e00c722b
2 changed files with 37 additions and 1 deletions
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4
share/man/man4/dummymbuf.4
View file

@ -26,7 +26,7 @@
.\"
.\" Note: The date here should be updated whenever a non-trivial
.\" change is made to the manual page.
.Dd August 2, 2024
.Dd January 6, 2025
.Dt DUMMYMBUF 4
.Os
.Sh NAME
@ -121,6 +121,8 @@ tail mbuf(s) left empty.
.Pp
As a result, only the layout of a mbuf chain is altered, its content logically
is left intact.
.It enlarge <number-of-bytes>
Unconditionally replace the mbuf with an mbuf of the specified size.
.El
.Sh SYSCTL VARIABLES
The following variables are available:

34
sys/net/dummymbuf.c
View file

@ -209,6 +209,37 @@ bad:
return (NULL);
}
static struct mbuf *
dmb_m_enlarge(struct mbuf *m, struct rule *rule)
{
struct mbuf *n;
int size;
size = (int)strtol(rule->opargs, NULL, 10);
if (size < 0 || size > MJUM16BYTES)
goto bad;
if (!(m->m_flags & M_PKTHDR))
goto bad;
if (m->m_pkthdr.len <= 0)
return (m);
if ((n = m_get3(size, M_NOWAIT, MT_DATA, M_PKTHDR)) == NULL)
goto bad;
m_move_pkthdr(n, m);
m_copydata(m, 0, m->m_pkthdr.len, n->m_ext.ext_buf);
n->m_len = m->m_pkthdr.len;
n->m_next = m;
return (n);
bad:
m_freem(m);
return (NULL);
}
static bool
read_rule(const char **cur, struct rule *rule, bool *eof)
{
@ -278,6 +309,9 @@ read_rule(const char **cur, struct rule *rule, bool *eof)
if (strstr(*cur, "pull-head") == *cur) {
rule->op = dmb_m_pull_head;
*cur += strlen("pull-head");
} else if (strstr(*cur, "enlarge") == *cur) {
rule->op = dmb_m_enlarge;
*cur += strlen("enlarge");
} else {
return (false);
}