#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_protocol.h>
struct nf_nat_seq *this_way, *other_way;
struct nf_conn_nat *nat = nfct_nat(ct);
- pr_debug("adjust_tcp_sequence: seq = %u, sizediff = %d\n",
- ntohl(seq), seq);
+ pr_debug("adjust_tcp_sequence: seq = %u, sizediff = %d\n", seq, seq);
dir = CTINFO2DIR(ctinfo);
}
/* Unusual, but possible case. */
-static int enlarge_skb(struct sk_buff **pskb, unsigned int extra)
+static int enlarge_skb(struct sk_buff *skb, unsigned int extra)
{
- struct sk_buff *nskb;
-
- if ((*pskb)->len + extra > 65535)
+ if (skb->len + extra > 65535)
return 0;
- nskb = skb_copy_expand(*pskb, skb_headroom(*pskb), extra, GFP_ATOMIC);
- if (!nskb)
+ if (pskb_expand_head(skb, 0, extra - skb_tailroom(skb), GFP_ATOMIC))
return 0;
- /* Transfer socket to new skb. */
- if ((*pskb)->sk)
- skb_set_owner_w(nskb, (*pskb)->sk);
- kfree_skb(*pskb);
- *pskb = nskb;
return 1;
}
*
* */
int
-nf_nat_mangle_tcp_packet(struct sk_buff **pskb,
+nf_nat_mangle_tcp_packet(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int match_offset,
const char *rep_buffer,
unsigned int rep_len)
{
- struct rtable *rt = (struct rtable *)(*pskb)->dst;
+ struct rtable *rt = (struct rtable *)skb->dst;
struct iphdr *iph;
struct tcphdr *tcph;
int oldlen, datalen;
- if (!skb_make_writable(pskb, (*pskb)->len))
+ if (!skb_make_writable(skb, skb->len))
return 0;
if (rep_len > match_len &&
- rep_len - match_len > skb_tailroom(*pskb) &&
- !enlarge_skb(pskb, rep_len - match_len))
+ rep_len - match_len > skb_tailroom(skb) &&
+ !enlarge_skb(skb, rep_len - match_len))
return 0;
- SKB_LINEAR_ASSERT(*pskb);
+ SKB_LINEAR_ASSERT(skb);
- iph = ip_hdr(*pskb);
+ iph = ip_hdr(skb);
tcph = (void *)iph + iph->ihl*4;
- oldlen = (*pskb)->len - iph->ihl*4;
- mangle_contents(*pskb, iph->ihl*4 + tcph->doff*4,
+ oldlen = skb->len - iph->ihl*4;
+ mangle_contents(skb, iph->ihl*4 + tcph->doff*4,
match_offset, match_len, rep_buffer, rep_len);
- datalen = (*pskb)->len - iph->ihl*4;
- if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ datalen = skb->len - iph->ihl*4;
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
if (!(rt->rt_flags & RTCF_LOCAL) &&
- (*pskb)->dev->features & NETIF_F_V4_CSUM) {
- (*pskb)->ip_summed = CHECKSUM_PARTIAL;
- (*pskb)->csum_start = skb_headroom(*pskb) +
- skb_network_offset(*pskb) +
- iph->ihl * 4;
- (*pskb)->csum_offset = offsetof(struct tcphdr, check);
+ skb->dev->features & NETIF_F_V4_CSUM) {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_headroom(skb) +
+ skb_network_offset(skb) +
+ iph->ihl * 4;
+ skb->csum_offset = offsetof(struct tcphdr, check);
tcph->check = ~tcp_v4_check(datalen,
iph->saddr, iph->daddr, 0);
} else {
datalen, 0));
}
} else
- nf_proto_csum_replace2(&tcph->check, *pskb,
- htons(oldlen), htons(datalen), 1);
+ inet_proto_csum_replace2(&tcph->check, skb,
+ htons(oldlen), htons(datalen), 1);
if (rep_len != match_len) {
set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
(int)rep_len - (int)match_len,
ct, ctinfo);
/* Tell TCP window tracking about seq change */
- nf_conntrack_tcp_update(*pskb, ip_hdrlen(*pskb),
+ nf_conntrack_tcp_update(skb, ip_hdrlen(skb),
ct, CTINFO2DIR(ctinfo));
+
+ nf_conntrack_event_cache(IPCT_NATSEQADJ, skb);
}
return 1;
}
* should be fairly easy to do.
*/
int
-nf_nat_mangle_udp_packet(struct sk_buff **pskb,
+nf_nat_mangle_udp_packet(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int match_offset,
const char *rep_buffer,
unsigned int rep_len)
{
- struct rtable *rt = (struct rtable *)(*pskb)->dst;
+ struct rtable *rt = (struct rtable *)skb->dst;
struct iphdr *iph;
struct udphdr *udph;
int datalen, oldlen;
/* UDP helpers might accidentally mangle the wrong packet */
- iph = ip_hdr(*pskb);
- if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) +
+ iph = ip_hdr(skb);
+ if (skb->len < iph->ihl*4 + sizeof(*udph) +
match_offset + match_len)
return 0;
- if (!skb_make_writable(pskb, (*pskb)->len))
+ if (!skb_make_writable(skb, skb->len))
return 0;
if (rep_len > match_len &&
- rep_len - match_len > skb_tailroom(*pskb) &&
- !enlarge_skb(pskb, rep_len - match_len))
+ rep_len - match_len > skb_tailroom(skb) &&
+ !enlarge_skb(skb, rep_len - match_len))
return 0;
- iph = ip_hdr(*pskb);
+ iph = ip_hdr(skb);
udph = (void *)iph + iph->ihl*4;
- oldlen = (*pskb)->len - iph->ihl*4;
- mangle_contents(*pskb, iph->ihl*4 + sizeof(*udph),
+ oldlen = skb->len - iph->ihl*4;
+ mangle_contents(skb, iph->ihl*4 + sizeof(*udph),
match_offset, match_len, rep_buffer, rep_len);
/* update the length of the UDP packet */
- datalen = (*pskb)->len - iph->ihl*4;
+ datalen = skb->len - iph->ihl*4;
udph->len = htons(datalen);
/* fix udp checksum if udp checksum was previously calculated */
- if (!udph->check && (*pskb)->ip_summed != CHECKSUM_PARTIAL)
+ if (!udph->check && skb->ip_summed != CHECKSUM_PARTIAL)
return 1;
- if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
if (!(rt->rt_flags & RTCF_LOCAL) &&
- (*pskb)->dev->features & NETIF_F_V4_CSUM) {
- (*pskb)->ip_summed = CHECKSUM_PARTIAL;
- (*pskb)->csum_start = skb_headroom(*pskb) +
- skb_network_offset(*pskb) +
- iph->ihl * 4;
- (*pskb)->csum_offset = offsetof(struct udphdr, check);
+ skb->dev->features & NETIF_F_V4_CSUM) {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_headroom(skb) +
+ skb_network_offset(skb) +
+ iph->ihl * 4;
+ skb->csum_offset = offsetof(struct udphdr, check);
udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
datalen, IPPROTO_UDP,
0);
udph->check = CSUM_MANGLED_0;
}
} else
- nf_proto_csum_replace2(&udph->check, *pskb,
- htons(oldlen), htons(datalen), 1);
+ inet_proto_csum_replace2(&udph->check, skb,
+ htons(oldlen), htons(datalen), 1);
return 1;
}
ntohl(sack->start_seq), new_start_seq,
ntohl(sack->end_seq), new_end_seq);
- nf_proto_csum_replace4(&tcph->check, skb,
- sack->start_seq, new_start_seq, 0);
- nf_proto_csum_replace4(&tcph->check, skb,
- sack->end_seq, new_end_seq, 0);
+ inet_proto_csum_replace4(&tcph->check, skb,
+ sack->start_seq, new_start_seq, 0);
+ inet_proto_csum_replace4(&tcph->check, skb,
+ sack->end_seq, new_end_seq, 0);
sack->start_seq = new_start_seq;
sack->end_seq = new_end_seq;
sackoff += sizeof(*sack);
/* TCP SACK sequence number adjustment */
static inline unsigned int
-nf_nat_sack_adjust(struct sk_buff **pskb,
+nf_nat_sack_adjust(struct sk_buff *skb,
struct tcphdr *tcph,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo)
unsigned int dir, optoff, optend;
struct nf_conn_nat *nat = nfct_nat(ct);
- optoff = ip_hdrlen(*pskb) + sizeof(struct tcphdr);
- optend = ip_hdrlen(*pskb) + tcph->doff * 4;
+ optoff = ip_hdrlen(skb) + sizeof(struct tcphdr);
+ optend = ip_hdrlen(skb) + tcph->doff * 4;
- if (!skb_make_writable(pskb, optend))
+ if (!skb_make_writable(skb, optend))
return 0;
dir = CTINFO2DIR(ctinfo);
while (optoff < optend) {
/* Usually: option, length. */
- unsigned char *op = (*pskb)->data + optoff;
+ unsigned char *op = skb->data + optoff;
switch (op[0]) {
case TCPOPT_EOL:
if (op[0] == TCPOPT_SACK &&
op[1] >= 2+TCPOLEN_SACK_PERBLOCK &&
((op[1] - 2) % TCPOLEN_SACK_PERBLOCK) == 0)
- sack_adjust(*pskb, tcph, optoff+2,
+ sack_adjust(skb, tcph, optoff+2,
optoff+op[1], &nat->seq[!dir]);
optoff += op[1];
}
/* TCP sequence number adjustment. Returns 1 on success, 0 on failure */
int
-nf_nat_seq_adjust(struct sk_buff **pskb,
+nf_nat_seq_adjust(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo)
{
this_way = &nat->seq[dir];
other_way = &nat->seq[!dir];
- if (!skb_make_writable(pskb, ip_hdrlen(*pskb) + sizeof(*tcph)))
+ if (!skb_make_writable(skb, ip_hdrlen(skb) + sizeof(*tcph)))
return 0;
- tcph = (void *)(*pskb)->data + ip_hdrlen(*pskb);
+ tcph = (void *)skb->data + ip_hdrlen(skb);
if (after(ntohl(tcph->seq), this_way->correction_pos))
newseq = htonl(ntohl(tcph->seq) + this_way->offset_after);
else
else
newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_before);
- nf_proto_csum_replace4(&tcph->check, *pskb, tcph->seq, newseq, 0);
- nf_proto_csum_replace4(&tcph->check, *pskb, tcph->ack_seq, newack, 0);
+ inet_proto_csum_replace4(&tcph->check, skb, tcph->seq, newseq, 0);
+ inet_proto_csum_replace4(&tcph->check, skb, tcph->ack_seq, newack, 0);
pr_debug("Adjusting sequence number from %u->%u, ack from %u->%u\n",
ntohl(tcph->seq), ntohl(newseq), ntohl(tcph->ack_seq),
tcph->seq = newseq;
tcph->ack_seq = newack;
- if (!nf_nat_sack_adjust(pskb, tcph, ct, ctinfo))
+ if (!nf_nat_sack_adjust(skb, tcph, ct, ctinfo))
return 0;
- nf_conntrack_tcp_update(*pskb, ip_hdrlen(*pskb), ct, dir);
+ nf_conntrack_tcp_update(skb, ip_hdrlen(skb), ct, dir);
return 1;
}
range.flags = IP_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
- /* hook doesn't matter, but it has to do source manip */
- nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
+ nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
/* For DST manip, map port here to where it's expected. */
range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
range.min = range.max = exp->saved_proto;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
- /* hook doesn't matter, but it has to do destination manip */
- nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
+ nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
}
EXPORT_SYMBOL(nf_nat_follow_master);
git.samba.org / sfrench / cifs-2.6.git / blobdiff