diff options
Diffstat (limited to 'slirp/src/mbuf.c')
| m--------- | slirp | 0 | ||||
| -rw-r--r-- | slirp/src/mbuf.c | 235 |
2 files changed, 0 insertions, 235 deletions
diff --git a/slirp b/slirp new file mode 160000 +Subproject 59a1b1f165458c2acb7ff0525b543945f741622 diff --git a/slirp/src/mbuf.c b/slirp/src/mbuf.c deleted file mode 100644 index 800406ca9e..0000000000 --- a/slirp/src/mbuf.c +++ /dev/null @@ -1,235 +0,0 @@ -/* SPDX-License-Identifier: BSD-3-Clause */ -/* - * Copyright (c) 1995 Danny Gasparovski - */ - -/* - * mbuf's in SLiRP are much simpler than the real mbufs in - * FreeBSD. They are fixed size, determined by the MTU, - * so that one whole packet can fit. Mbuf's cannot be - * chained together. If there's more data than the mbuf - * could hold, an external g_malloced buffer is pointed to - * by m_ext (and the data pointers) and M_EXT is set in - * the flags - */ - -#include "slirp.h" - -#define MBUF_THRESH 30 - -/* - * Find a nice value for msize - */ -#define SLIRP_MSIZE\ - (offsetof(struct mbuf, m_dat) + IF_MAXLINKHDR + TCPIPHDR_DELTA + IF_MTU) - -void -m_init(Slirp *slirp) -{ - slirp->m_freelist.qh_link = slirp->m_freelist.qh_rlink = &slirp->m_freelist; - slirp->m_usedlist.qh_link = slirp->m_usedlist.qh_rlink = &slirp->m_usedlist; -} - -void m_cleanup(Slirp *slirp) -{ - struct mbuf *m, *next; - - m = (struct mbuf *) slirp->m_usedlist.qh_link; - while ((struct quehead *) m != &slirp->m_usedlist) { - next = m->m_next; - if (m->m_flags & M_EXT) { - g_free(m->m_ext); - } - g_free(m); - m = next; - } - m = (struct mbuf *) slirp->m_freelist.qh_link; - while ((struct quehead *) m != &slirp->m_freelist) { - next = m->m_next; - g_free(m); - m = next; - } -} - -/* - * Get an mbuf from the free list, if there are none - * allocate one - * - * Because fragmentation can occur if we alloc new mbufs and - * free old mbufs, we mark all mbufs above mbuf_thresh as M_DOFREE, - * which tells m_free to actually g_free() it - */ -struct mbuf * -m_get(Slirp *slirp) -{ - register struct mbuf *m; - int flags = 0; - - DEBUG_CALL("m_get"); - - if (slirp->m_freelist.qh_link == &slirp->m_freelist) { - m = g_malloc(SLIRP_MSIZE); - slirp->mbuf_alloced++; - if (slirp->mbuf_alloced > MBUF_THRESH) - flags = M_DOFREE; - m->slirp = slirp; - } else { - m = (struct mbuf *) slirp->m_freelist.qh_link; - remque(m); - } - - /* Insert it in the used list */ - insque(m,&slirp->m_usedlist); - m->m_flags = (flags | M_USEDLIST); - - /* Initialise it */ - m->m_size = SLIRP_MSIZE - offsetof(struct mbuf, m_dat); - m->m_data = m->m_dat; - m->m_len = 0; - m->m_nextpkt = NULL; - m->m_prevpkt = NULL; - m->resolution_requested = false; - m->expiration_date = (uint64_t)-1; - DEBUG_ARG("m = %p", m); - return m; -} - -void -m_free(struct mbuf *m) -{ - - DEBUG_CALL("m_free"); - DEBUG_ARG("m = %p", m); - - if(m) { - /* Remove from m_usedlist */ - if (m->m_flags & M_USEDLIST) - remque(m); - - /* If it's M_EXT, free() it */ - if (m->m_flags & M_EXT) { - g_free(m->m_ext); - } - /* - * Either free() it or put it on the free list - */ - if (m->m_flags & M_DOFREE) { - m->slirp->mbuf_alloced--; - g_free(m); - } else if ((m->m_flags & M_FREELIST) == 0) { - insque(m,&m->slirp->m_freelist); - m->m_flags = M_FREELIST; /* Clobber other flags */ - } - } /* if(m) */ -} - -/* - * Copy data from one mbuf to the end of - * the other.. if result is too big for one mbuf, allocate - * an M_EXT data segment - */ -void -m_cat(struct mbuf *m, struct mbuf *n) -{ - /* - * If there's no room, realloc - */ - if (M_FREEROOM(m) < n->m_len) - m_inc(m, m->m_len + n->m_len); - - memcpy(m->m_data+m->m_len, n->m_data, n->m_len); - m->m_len += n->m_len; - - m_free(n); -} - - -/* make m 'size' bytes large from m_data */ -void -m_inc(struct mbuf *m, int size) -{ - int gapsize; - - /* some compilers throw up on gotos. This one we can fake. */ - if (M_ROOM(m) > size) { - return; - } - - if (m->m_flags & M_EXT) { - gapsize = m->m_data - m->m_ext; - m->m_ext = g_realloc(m->m_ext, size + gapsize); - } else { - gapsize = m->m_data - m->m_dat; - m->m_ext = g_malloc(size + gapsize); - memcpy(m->m_ext, m->m_dat, m->m_size); - m->m_flags |= M_EXT; - } - - m->m_data = m->m_ext + gapsize; - m->m_size = size + gapsize; -} - - - -void -m_adj(struct mbuf *m, int len) -{ - if (m == NULL) - return; - if (len >= 0) { - /* Trim from head */ - m->m_data += len; - m->m_len -= len; - } else { - /* Trim from tail */ - len = -len; - m->m_len -= len; - } -} - - -/* - * Copy len bytes from m, starting off bytes into n - */ -int -m_copy(struct mbuf *n, struct mbuf *m, int off, int len) -{ - if (len > M_FREEROOM(n)) - return -1; - - memcpy((n->m_data + n->m_len), (m->m_data + off), len); - n->m_len += len; - return 0; -} - - -/* - * Given a pointer into an mbuf, return the mbuf - * XXX This is a kludge, I should eliminate the need for it - * Fortunately, it's not used often - */ -struct mbuf * -dtom(Slirp *slirp, void *dat) -{ - struct mbuf *m; - - DEBUG_CALL("dtom"); - DEBUG_ARG("dat = %p", dat); - - /* bug corrected for M_EXT buffers */ - for (m = (struct mbuf *) slirp->m_usedlist.qh_link; - (struct quehead *) m != &slirp->m_usedlist; - m = m->m_next) { - if (m->m_flags & M_EXT) { - if( (char *)dat>=m->m_ext && (char *)dat<(m->m_ext + m->m_size) ) - return m; - } else { - if( (char *)dat >= m->m_dat && (char *)dat<(m->m_dat + m->m_size) ) - return m; - } - } - - DEBUG_ERROR("dtom failed"); - - return (struct mbuf *)0; -} |