/* nf_nat_helper.c - generic support functions for NAT helpers * * (C) 2000-2002 Harald Welte * (C) 2003-2006 Netfilter Core Team * (C) 2007-2012 Patrick McHardy * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Frobs data inside this packet, which is linear. */ static void mangle_contents(struct sk_buff *skb, unsigned int dataoff, unsigned int match_offset, unsigned int match_len, const char *rep_buffer, unsigned int rep_len) { unsigned char *data; BUG_ON(skb_is_nonlinear(skb)); data = skb_network_header(skb) + dataoff; /* move post-replacement */ memmove(data + match_offset + rep_len, data + match_offset + match_len, skb_tail_pointer(skb) - (skb_network_header(skb) + dataoff + match_offset + match_len)); /* insert data from buffer */ memcpy(data + match_offset, rep_buffer, rep_len); /* update skb info */ if (rep_len > match_len) { pr_debug("nf_nat_mangle_packet: Extending packet by " "%u from %u bytes\n", rep_len - match_len, skb->len); skb_put(skb, rep_len - match_len); } else { pr_debug("nf_nat_mangle_packet: Shrinking packet from " "%u from %u bytes\n", match_len - rep_len, skb->len); __skb_trim(skb, skb->len + rep_len - match_len); } if (nf_ct_l3num((struct nf_conn *)skb->nfct) == NFPROTO_IPV4) { /* fix IP hdr checksum information */ ip_hdr(skb)->tot_len = htons(skb->len); ip_send_check(ip_hdr(skb)); } else ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); } /* Unusual, but possible case. */ static int enlarge_skb(struct sk_buff *skb, unsigned int extra) { if (skb->len + extra > 65535) return 0; if (pskb_expand_head(skb, 0, extra - skb_tailroom(skb), GFP_ATOMIC)) return 0; return 1; } /* Generic function for mangling variable-length address changes inside * NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX * command in FTP). * * Takes care about all the nasty sequence number changes, checksumming, * skb enlargement, ... * * */ int __nf_nat_mangle_tcp_packet(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned int match_offset, unsigned int match_len, const char *rep_buffer, unsigned int rep_len, bool adjust) { const struct nf_nat_l3proto *l3proto; struct tcphdr *tcph; int oldlen, datalen; if (!skb_make_writable(skb, skb->len)) return 0; if (rep_len > match_len && rep_len - match_len > skb_tailroom(skb) && !enlarge_skb(skb, rep_len - match_len)) return 0; SKB_LINEAR_ASSERT(skb); tcph = (void *)skb->data + protoff; oldlen = skb->len - protoff; mangle_contents(skb, protoff + tcph->doff*4, match_offset, match_len, rep_buffer, rep_len); datalen = skb->len - protoff; l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct)); l3proto->csum_recalc(skb, IPPROTO_TCP, tcph, &tcph->check, datalen, oldlen); if (adjust && rep_len != match_len) nf_ct_seqadj_set(ct, ctinfo, tcph->seq, (int)rep_len - (int)match_len); return 1; } EXPORT_SYMBOL(__nf_nat_mangle_tcp_packet); /* Generic function for mangling variable-length address changes inside * NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX * command in the Amanda protocol) * * Takes care about all the nasty sequence number changes, checksumming, * skb enlargement, ... * * XXX - This function could be merged with nf_nat_mangle_tcp_packet which * should be fairly easy to do. */ int nf_nat_mangle_udp_packet(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int protoff, unsigned int match_offset, unsigned int match_len, const char *rep_buffer, unsigned int rep_len) { const struct nf_nat_l3proto *l3proto; struct udphdr *udph; int datalen, oldlen; if (!skb_make_writable(skb, skb->len)) return 0; if (rep_len > match_len && rep_len - match_len > skb_tailroom(skb) && !enlarge_skb(skb, rep_len - match_len)) return 0; udph = (void *)skb->data + protoff; oldlen = skb->len - protoff; mangle_contents(skb, protoff + sizeof(*udph), match_offset, match_len, rep_buffer, rep_len); /* update the length of the UDP packet */ datalen = skb->len - protoff; udph->len = htons(datalen); /* fix udp checksum if udp checksum was previously calculated */ if (!udph->check && skb->ip_summed != CHECKSUM_PARTIAL) return 1; l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct)); l3proto->csum_recalc(skb, IPPROTO_UDP, udph, &udph->check, datalen, oldlen); return 1; } EXPORT_SYMBOL(nf_nat_mangle_udp_packet); /* Setup NAT on this expected conntrack so it follows master. */ /* If we fail to get a free NAT slot, we'll get dropped on confirm */ void nf_nat_follow_master(struct nf_conn *ct, struct nf_conntrack_expect *exp) { struct nf_nat_range range; /* This must be a fresh one. */ BUG_ON(ct->status & IPS_NAT_DONE_MASK); /* Change src to where master sends to */ range.flags = NF_NAT_RANGE_MAP_IPS; range.min_addr = range.max_addr = ct->master->tuplehash[!exp->dir].tuple.dst.u3; nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC); /* For DST manip, map port here to where it's expected. */ range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED); range.min_proto = range.max_proto = exp->saved_proto; range.min_addr = range.max_addr = ct->master->tuplehash[!exp->dir].tuple.src.u3; nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST); } EXPORT_SYMBOL(nf_nat_follow_master); VPD structures stored in the VPD: - offset 0x000: an abbreviated VPD, and - offset 0x400: the complete VPD. After 104daa71b396 ("PCI: Determine actual VPD size on first access"), the PCI core computes the valid VPD size by parsing the VPD starting at offset 0x0. That size only includes the abbreviated VPD structure, so reads of the complete VPD at 0x400 fail. Explicitly set the VPD size with pci_set_vpd_size() so the driver can read both VPD structures. [bhelgaas: changelog, split patches, rename to pci_set_vpd_size() and return int (not ssize_t)] Fixes: 104daa71b396 ("PCI: Determine actual VPD size on first access") Tested-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Casey Leedom <leedom@chelsio.com> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/devicetree/bindings/mmc')