/*
* ATTN: When changing anything here check m_inithdr() and m_defrag() those
* may need to change as well.
*/
struct mbuf *
m_gethdr(int nowait, int type)
{
struct mbuf *m;
m = pool_get(&mbpool, nowait == M_WAIT ? PR_WAITOK : PR_NOWAIT);
if (m == NULL)
return (NULL);
mtx_enter(&mbstatmtx);
mbstat.m_mtypes[type]++;
mtx_leave(&mbstatmtx);
m->m_type = type;
return (m_inithdr(m));
}
void
pflog_bpfcopy(const void *src_arg, void *dst_arg, size_t len)
{
struct mbuf *m, *mp, *mhdr, *mptr;
struct pfloghdr *pfloghdr;
u_int count;
u_char *dst, *mdst, *cp;
u_short reason;
int afto, hlen, mlen, off;
union pf_headers {
struct tcphdr tcp;
struct udphdr udp;
struct icmp icmp;
#ifdef INET6
struct icmp6_hdr icmp6;
struct mld_hdr mld;
struct nd_neighbor_solicit nd_ns;
#endif /* INET6 */
} pdhdrs;
struct pf_pdesc pd;
struct pf_addr osaddr, odaddr;
u_int16_t osport = 0, odport = 0;
u_int8_t proto = 0;
m = (struct mbuf *)src_arg;
dst = dst_arg;
mhdr = pflog_mhdr;
mptr = pflog_mptr;
if (m == NULL)
panic("pflog_bpfcopy got no mbuf");
/* first mbuf holds struct pfloghdr */
pfloghdr = mtod(m, struct pfloghdr *);
afto = pfloghdr->af != pfloghdr->naf;
count = min(m->m_len, len);
bcopy(pfloghdr, dst, count);
pfloghdr = (struct pfloghdr *)dst;
dst += count;
len -= count;
m = m->m_next;
if (len <= 0)
return;
/* second mbuf is pkthdr */
if (m == NULL)
panic("no second mbuf");
/*
* temporary mbuf will hold an ip/ip6 header and 8 bytes
* of the protocol header
*/
m_inithdr(mhdr);
mhdr->m_len = 0; /* XXX not done in m_inithdr() */
#if INET && INET6
/* offset for a new header */
if (afto && pfloghdr->af == AF_INET)
mhdr->m_data += sizeof(struct ip6_hdr) -
sizeof(struct ip);
#endif /* INET && INET6 */
mdst = mtod(mhdr, char *);
switch (pfloghdr->af) {
case AF_INET: {
struct ip *h;
if (m->m_pkthdr.len < sizeof(*h))
goto copy;
m_copydata(m, 0, sizeof(*h), mdst);
h = (struct ip *)mdst;
hlen = h->ip_hl << 2;
if (hlen > sizeof(*h) && (m->m_pkthdr.len >= hlen))
m_copydata(m, sizeof(*h), hlen - sizeof(*h),
mdst + sizeof(*h));
break;
}
#ifdef INET6
case AF_INET6: {
struct ip6_hdr *h;
if (m->m_pkthdr.len < sizeof(*h))
goto copy;
hlen = sizeof(struct ip6_hdr);
m_copydata(m, 0, hlen, mdst);
h = (struct ip6_hdr *)mdst;
proto = h->ip6_nxt;
break;
}
#endif /* INET6 */
default:
/* shouldn't happen ever :-) */
goto copy;
}
if (m->m_pkthdr.len < hlen + 8 && proto != IPPROTO_NONE)
goto copy;
else if (proto != IPPROTO_NONE) {
/* copy 8 bytes of the protocol header */
m_copydata(m, hlen, 8, mdst + hlen);
hlen += 8;
}
mhdr->m_len += hlen;
mhdr->m_pkthdr.len = mhdr->m_len;
/* create a chain mhdr -> mptr, mptr->m_data = (m->m_data+hlen) */
mp = m_getptr(m, hlen, &off);
if (mp != NULL) {
bcopy(mp, mptr, sizeof(*mptr));
cp = mtod(mp, char *);
mptr->m_data += off;
mptr->m_len -= off;
mptr->m_flags &= ~M_PKTHDR;
mhdr->m_next = mptr;
mhdr->m_pkthdr.len += m->m_pkthdr.len - hlen;
}
void
pflog_bpfcopy(const void *src_arg, void *dst_arg, size_t len)
{
struct mbuf *m, *mp, *mhdr, *mptr;
struct pfloghdr *pfloghdr;
u_int count;
u_char *dst, *mdst;
int afto, hlen, mlen, off;
union pf_headers {
struct tcphdr tcp;
struct udphdr udp;
struct icmp icmp;
#ifdef INET6
struct icmp6_hdr icmp6;
struct mld_hdr mld;
struct nd_neighbor_solicit nd_ns;
#endif /* INET6 */
} pdhdrs;
struct pf_pdesc pd;
struct pf_addr osaddr, odaddr;
u_int16_t osport = 0, odport = 0;
u_int8_t proto = 0;
m = (struct mbuf *)src_arg;
dst = dst_arg;
mhdr = pflog_mhdr;
mptr = pflog_mptr;
if (m == NULL)
panic("pflog_bpfcopy got no mbuf");
/* first mbuf holds struct pfloghdr */
pfloghdr = mtod(m, struct pfloghdr *);
afto = pfloghdr->af != pfloghdr->naf;
count = min(m->m_len, len);
bcopy(pfloghdr, dst, count);
pfloghdr = (struct pfloghdr *)dst;
dst += count;
len -= count;
m = m->m_next;
if (len <= 0)
return;
/* second mbuf is pkthdr */
if (m == NULL)
panic("no second mbuf");
/*
* temporary mbuf will hold an ip/ip6 header and 8 bytes
* of the protocol header
*/
m_inithdr(mhdr);
mhdr->m_len = 0; /* XXX not done in m_inithdr() */
#if INET && INET6
/* offset for a new header */
if (afto && pfloghdr->af == AF_INET)
mhdr->m_data += sizeof(struct ip6_hdr) -
sizeof(struct ip);
#endif /* INET && INET6 */
mdst = mtod(mhdr, char *);
switch (pfloghdr->af) {
case AF_INET: {
struct ip *h;
if (m->m_pkthdr.len < sizeof(*h))
goto copy;
m_copydata(m, 0, sizeof(*h), mdst);
h = (struct ip *)mdst;
hlen = h->ip_hl << 2;
if (hlen > sizeof(*h) && (m->m_pkthdr.len >= hlen))
m_copydata(m, sizeof(*h), hlen - sizeof(*h),
mdst + sizeof(*h));
break;
}
#ifdef INET6
case AF_INET6: {
struct ip6_hdr *h;
if (m->m_pkthdr.len < sizeof(*h))
goto copy;
hlen = sizeof(struct ip6_hdr);
m_copydata(m, 0, hlen, mdst);
h = (struct ip6_hdr *)mdst;
proto = h->ip6_nxt;
break;
}
#endif /* INET6 */
default:
/* shouldn't happen ever :-) */
goto copy;
}
if (m->m_pkthdr.len < hlen + 8 && proto != IPPROTO_NONE)
goto copy;
else if (proto != IPPROTO_NONE) {
/* copy 8 bytes of the protocol header */
m_copydata(m, hlen, 8, mdst + hlen);
hlen += 8;
}
mhdr->m_len += hlen;
mhdr->m_pkthdr.len = mhdr->m_len;
/* create a chain mhdr -> mptr, mptr->m_data = (m->m_data+hlen) */
mp = m_getptr(m, hlen, &off);
if (mp != NULL) {
bcopy(mp, mptr, sizeof(*mptr));
mptr->m_data += off;
mptr->m_len -= off;
mptr->m_flags &= ~M_PKTHDR;
mhdr->m_next = mptr;
mhdr->m_pkthdr.len += m->m_pkthdr.len - hlen;
}
/*
* Rewrite addresses if needed. Reason pointer must be NULL to avoid
* counting the packet here again.
*/
if (pf_setup_pdesc(&pd, &pdhdrs, pfloghdr->af, pfloghdr->dir, NULL,
mhdr, NULL) != PF_PASS)
goto copy;
pd.naf = pfloghdr->naf;
PF_ACPY(&osaddr, pd.src, pd.af);
PF_ACPY(&odaddr, pd.dst, pd.af);
if (pd.sport)
osport = *pd.sport;
if (pd.dport)
odport = *pd.dport;
if (pd.virtual_proto != PF_VPROTO_FRAGMENT &&
(pfloghdr->rewritten = pf_translate(&pd, &pfloghdr->saddr,
pfloghdr->sport, &pfloghdr->daddr, pfloghdr->dport, 0,
pfloghdr->dir))) {
m_copyback(pd.m, pd.off, min(pd.m->m_len - pd.off, pd.hdrlen),
pd.hdr.any, M_NOWAIT);
#if INET && INET6
if (afto) {
PF_ACPY(&pd.nsaddr, &pfloghdr->saddr, pd.naf);
PF_ACPY(&pd.ndaddr, &pfloghdr->daddr, pd.naf);
}
#endif /* INET && INET6 */
PF_ACPY(&pfloghdr->saddr, &osaddr, pd.af);
PF_ACPY(&pfloghdr->daddr, &odaddr, pd.af);
pfloghdr->sport = osport;
pfloghdr->dport = odport;
}
pd.tot_len = min(pd.tot_len, len);
pd.tot_len -= pd.m->m_data - pd.m->m_pktdat;
#if INET && INET6
if (afto && pfloghdr->rewritten)
pf_translate_af(&pd);
#endif /* INET && INET6 */
m = pd.m;
copy:
mlen = min(m->m_pkthdr.len, len);
m_copydata(m, 0, mlen, dst);
len -= mlen;
if (len > 0)
bzero(dst + mlen, len);
}