PFIL_MEMPTR for ipfw link level hook
With new pfil(9) KPI it is possible to pass a void pointer with length instead of mbuf pointer to a packet filter. Until this commit no filters supported that, so pfil run through a shim function pfil_fake_mbuf(). Now the ipfw(4) hook named "default-link", that is instantiated when net.link.ether.ipfw sysctl is on, supports processing pointer/length packets natively. - ip_fw_args now has union for either mbuf or void *, and if flags have non-zero length, then we use the void *. - through ipfw_chk() we handle mem/mbuf cases differently. - ether_header goes away from args. It is ipfw_chk() responsibility to do parsing of Ethernet header. - ipfw_log() now uses different bpf APIs to log packets. Although ipfw_chk() is now capable to process pointer/length packets, this commit adds support for the link level hook only, see ipfw_check_frame(). Potentially the IP processing hook ipfw_check_packet() can be improved too, but that requires more changes since the hook supports more complex actions: NAT, divert, etc. Reviewed by: ae Differential Revision: https://reviews.freebsd.org/D19357
This commit is contained in:
Gleb Smirnoff
parent
dc0fa4f712
commit
f355cb3e6f
@ -1258,7 +1258,6 @@ jump_linear(struct ip_fw_chain *chain, struct ip_fw *f, int num,
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*
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* args->m (in/out) The packet; we set to NULL when/if we nuke it.
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* Starts with the IP header.
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* args->eh (in) Mac header if present, NULL for layer3 packet.
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* args->L3offset Number of bytes bypassed if we came from L2.
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* e.g. often sizeof(eh) ** NOTYET **
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* args->ifp Incoming or outgoing interface.
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@ -1297,23 +1296,19 @@ ipfw_chk(struct ip_fw_args *args)
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* the implementation of the various instructions to make sure
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* that they still work.
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*
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* args->eh The MAC header. It is non-null for a layer2
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* packet, it is NULL for a layer-3 packet.
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* **notyet**
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* args->L3offset Offset in the packet to the L3 (IP or equiv.) header.
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*
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* m | args->m Pointer to the mbuf, as received from the caller.
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* It may change if ipfw_chk() does an m_pullup, or if it
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* consumes the packet because it calls send_reject().
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* XXX This has to change, so that ipfw_chk() never modifies
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* or consumes the buffer.
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* ip is the beginning of the ip(4 or 6) header.
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* Calculated by adding the L3offset to the start of data.
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* (Until we start using L3offset, the packet is
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* supposed to start with the ip header).
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* OR
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* args->mem Pointer to contigous memory chunk.
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* ip Is the beginning of the ip(4 or 6) header.
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* eh Ethernet header in case if input is Layer2.
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*/
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struct mbuf *m = args->m;
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struct ip *ip = mtod(m, struct ip *);
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struct mbuf *m;
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struct ip *ip;
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struct ether_header *eh;
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/*
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* For rules which contain uid/gid or jail constraints, cache
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@ -1370,7 +1365,6 @@ ipfw_chk(struct ip_fw_args *args)
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struct in_addr src_ip, dst_ip; /* NOTE: network format */
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int iplen = 0;
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int pktlen;
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uint16_t etype; /* Host order stored ether type */
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struct ipfw_dyn_info dyn_info;
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struct ip_fw *q = NULL;
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@ -1394,14 +1388,45 @@ ipfw_chk(struct ip_fw_args *args)
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int done = 0; /* flag to exit the outer loop */
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IPFW_RLOCK_TRACKER;
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bool mem;
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if (m->m_flags & M_SKIP_FIREWALL || (! V_ipfw_vnet_ready))
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return (IP_FW_PASS); /* accept */
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if ((mem = (args->flags & IPFW_ARGS_LENMASK))) {
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if (args->flags & IPFW_ARGS_ETHER) {
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eh = (struct ether_header *)args->mem;
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if (eh->ether_type == htons(ETHERTYPE_VLAN))
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ip = (struct ip *)
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((struct ether_vlan_header *)eh + 1);
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else
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ip = (struct ip *)(eh + 1);
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} else {
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eh = NULL;
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ip = (struct ip *)args->mem;
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}
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pktlen = IPFW_ARGS_LENGTH(args->flags);
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args->f_id.fib = args->ifp->if_fib; /* best guess */
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} else {
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m = args->m;
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if (m->m_flags & M_SKIP_FIREWALL || (! V_ipfw_vnet_ready))
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return (IP_FW_PASS); /* accept */
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if (args->flags & IPFW_ARGS_ETHER) {
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/* We need some amount of data to be contiguous. */
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if (m->m_len < min(m->m_pkthdr.len, max_protohdr) &&
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(args->m = m = m_pullup(m, min(m->m_pkthdr.len,
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max_protohdr))) == NULL)
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goto pullup_failed;
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eh = mtod(m, struct ether_header *);
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ip = (struct ip *)(eh + 1);
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} else {
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eh = NULL;
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ip = mtod(m, struct ip *);
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}
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pktlen = m->m_pkthdr.len;
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args->f_id.fib = M_GETFIB(m); /* mbuf not altered */
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}
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dst_ip.s_addr = 0; /* make sure it is initialized */
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src_ip.s_addr = 0; /* make sure it is initialized */
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src_port = dst_port = 0;
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pktlen = m->m_pkthdr.len;
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DYN_INFO_INIT(&dyn_info);
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/*
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@ -1411,28 +1436,41 @@ ipfw_chk(struct ip_fw_args *args)
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* this way).
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*/
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#define PULLUP_TO(_len, p, T) PULLUP_LEN(_len, p, sizeof(T))
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#define EHLEN (eh != NULL ? ((char *)ip - (char *)eh) : 0)
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#define PULLUP_LEN(_len, p, T) \
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do { \
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int x = (_len) + T; \
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if ((m)->m_len < x) { \
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args->m = m = m_pullup(m, x); \
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if (m == NULL) \
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goto pullup_failed; \
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int x = (_len) + T + EHLEN; \
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if (mem) { \
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MPASS(pktlen >= x); \
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p = (char *)args->mem + (_len) + EHLEN; \
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} else { \
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if (__predict_false((m)->m_len < x)) { \
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args->m = m = m_pullup(m, x); \
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if (m == NULL) \
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goto pullup_failed; \
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} \
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p = mtod(m, char *) + (_len) + EHLEN; \
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} \
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} while (0)
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/*
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* In case pointers got stale after pullups, update them.
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*/
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#define UPDATE_POINTERS() \
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do { \
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if (!mem) { \
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if (eh != NULL) { \
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eh = mtod(m, struct ether_header *); \
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ip = (struct ip *)(eh + 1); \
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} else \
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ip = mtod(m, struct ip *); \
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args->m = m; \
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} \
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p = (mtod(m, char *) + (_len)); \
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} while (0)
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/*
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* if we have an ether header,
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*/
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if (args->flags & IPFW_ARGS_ETHER)
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etype = ntohs(args->eh->ether_type);
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else
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etype = 0;
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/* Identify IP packets and fill up variables. */
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if (pktlen >= sizeof(struct ip6_hdr) &&
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(etype == 0 || etype == ETHERTYPE_IPV6) && ip->ip_v == 6) {
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(eh == NULL || eh->ether_type == htons(ETHERTYPE_IPV6)) &&
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ip->ip_v == 6) {
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struct ip6_hdr *ip6 = (struct ip6_hdr *)ip;
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is_ipv6 = 1;
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@ -1609,7 +1647,7 @@ do { \
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break;
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} /*switch */
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}
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ip = mtod(m, struct ip *);
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UPDATE_POINTERS();
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ip6 = (struct ip6_hdr *)ip;
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args->f_id.addr_type = 6;
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args->f_id.src_ip6 = ip6->ip6_src;
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@ -1617,7 +1655,8 @@ do { \
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args->f_id.flow_id6 = ntohl(ip6->ip6_flow);
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iplen = ntohs(ip6->ip6_plen) + sizeof(*ip6);
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} else if (pktlen >= sizeof(struct ip) &&
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(etype == 0 || etype == ETHERTYPE_IP) && ip->ip_v == 4) {
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(eh == NULL || eh->ether_type == htons(ETHERTYPE_IP)) &&
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ip->ip_v == 4) {
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is_ipv4 = 1;
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args->flags |= IPFW_ARGS_IP4;
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hlen = ip->ip_hl << 2;
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@ -1675,7 +1714,7 @@ do { \
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}
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}
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ip = mtod(m, struct ip *);
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UPDATE_POINTERS();
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args->f_id.addr_type = 4;
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args->f_id.src_ip = ntohl(src_ip.s_addr);
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args->f_id.dst_ip = ntohl(dst_ip.s_addr);
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@ -1692,7 +1731,6 @@ do { \
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args->f_id.proto = proto;
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args->f_id.src_port = src_port = ntohs(src_port);
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args->f_id.dst_port = dst_port = ntohs(dst_port);
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args->f_id.fib = M_GETFIB(m);
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IPFW_PF_RLOCK(chain);
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if (! V_ipfw_vnet_ready) { /* shutting down, leave NOW. */
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@ -1720,7 +1758,7 @@ do { \
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oif = NULL;
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} else {
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MPASS(args->flags & IPFW_ARGS_OUT);
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iif = m->m_pkthdr.rcvif;
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iif = mem ? NULL : m->m_pkthdr.rcvif;
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oif = args->ifp;
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}
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@ -1840,7 +1878,7 @@ do { \
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((ipfw_insn_mac *)cmd)->addr;
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u_int32_t *mask = (u_int32_t *)
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((ipfw_insn_mac *)cmd)->mask;
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u_int32_t *hdr = (u_int32_t *)args->eh;
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u_int32_t *hdr = (u_int32_t *)eh;
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match =
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( want[0] == (hdr[0] & mask[0]) &&
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@ -1857,8 +1895,11 @@ do { \
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for (i = cmdlen - 1; !match && i>0;
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i--, p += 2)
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match = (etype >= p[0] &&
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etype <= p[1]);
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match =
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(ntohs(eh->ether_type) >=
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p[0] &&
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ntohs(eh->ether_type) <=
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p[1]);
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}
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break;
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@ -2332,7 +2373,7 @@ do { \
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}
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case O_LOG:
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ipfw_log(chain, f, hlen, args, m,
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ipfw_log(chain, f, hlen, args,
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offset | ip6f_mf, tablearg, ip);
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match = 1;
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break;
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@ -160,6 +160,28 @@ ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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return (0);
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}
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void
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ipfw_bpf_tap(u_char *pkt, u_int pktlen)
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{
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LOGIF_RLOCK_TRACKER;
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LOGIF_RLOCK();
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if (V_log_if != NULL)
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BPF_TAP(V_log_if, pkt, pktlen);
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LOGIF_RUNLOCK();
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}
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void
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ipfw_bpf_mtap(struct mbuf *m)
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{
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LOGIF_RLOCK_TRACKER;
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LOGIF_RLOCK();
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if (V_log_if != NULL)
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BPF_MTAP(V_log_if, m);
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LOGIF_RUNLOCK();
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}
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void
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ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m)
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{
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@ -99,30 +99,32 @@ __FBSDID("$FreeBSD$");
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*/
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void
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ipfw_log(struct ip_fw_chain *chain, struct ip_fw *f, u_int hlen,
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struct ip_fw_args *args, struct mbuf *m,
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u_short offset, uint32_t tablearg, struct ip *ip)
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struct ip_fw_args *args, u_short offset, uint32_t tablearg, struct ip *ip)
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{
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char *action;
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int limit_reached = 0;
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char action2[92], proto[128], fragment[32];
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if (V_fw_verbose == 0) {
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if (args->flags & IPFW_ARGS_ETHER) /* layer2, use orig hdr */
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ipfw_bpf_mtap2(args->eh, ETHER_HDR_LEN, m);
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if (args->flags & IPFW_ARGS_LENMASK)
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ipfw_bpf_tap(args->mem, IPFW_ARGS_LENGTH(args->flags));
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else if (args->flags & IPFW_ARGS_ETHER)
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/* layer2, use orig hdr */
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ipfw_bpf_mtap(args->m);
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else {
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/* Add fake header. Later we will store
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* more info in the header.
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*/
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if (ip->ip_v == 4)
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ipfw_bpf_mtap2("DDDDDDSSSSSS\x08\x00",
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ETHER_HDR_LEN, m);
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ETHER_HDR_LEN, args->m);
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else if (ip->ip_v == 6)
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ipfw_bpf_mtap2("DDDDDDSSSSSS\x86\xdd",
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ETHER_HDR_LEN, m);
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ETHER_HDR_LEN, args->m);
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else
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/* Obviously bogus EtherType. */
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ipfw_bpf_mtap2("DDDDDDSSSSSS\xff\xff",
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ETHER_HDR_LEN, m);
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ETHER_HDR_LEN, args->m);
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}
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return;
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}
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@ -328,69 +328,50 @@ ipfw_check_packet(struct mbuf **m0, struct ifnet *ifp, int flags,
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* ipfw processing for ethernet packets (in and out).
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*/
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static pfil_return_t
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ipfw_check_frame(struct mbuf **m0, struct ifnet *ifp, int flags,
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ipfw_check_frame(pfil_packet_t p, struct ifnet *ifp, int flags,
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void *ruleset __unused, struct inpcb *inp)
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{
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struct ip_fw_args args;
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struct ether_header save_eh;
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struct ether_header *eh;
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struct m_tag *mtag;
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struct mbuf *m;
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pfil_return_t ret;
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int i;
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bool mem, realloc;
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int ipfw;
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args.flags = IPFW_ARGS_ETHER;
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if (flags & PFIL_MEMPTR) {
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mem = true;
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realloc = false;
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args.flags = PFIL_LENGTH(flags) | IPFW_ARGS_ETHER;
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args.mem = p.mem;
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} else {
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mem = realloc = false;
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args.flags = IPFW_ARGS_ETHER;
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}
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args.flags |= (flags & PFIL_IN) ? IPFW_ARGS_IN : IPFW_ARGS_OUT;
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again:
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/* fetch start point from rule, if any. remove the tag if present. */
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mtag = m_tag_locate(*m0, MTAG_IPFW_RULE, 0, NULL);
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if (mtag != NULL) {
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args.rule = *((struct ipfw_rule_ref *)(mtag+1));
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m_tag_delete(*m0, mtag);
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if (args.rule.info & IPFW_ONEPASS)
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return (0);
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args.flags |= IPFW_ARGS_REF;
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}
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/* I need some amt of data to be contiguous */
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m = *m0;
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i = min(m->m_pkthdr.len, max_protohdr);
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if (m->m_len < i) {
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m = m_pullup(m, i);
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if (m == NULL) {
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*m0 = m;
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return (0);
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}
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}
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eh = mtod(m, struct ether_header *);
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save_eh = *eh; /* save copy for restore below */
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m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
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args.m = m; /* the packet we are looking at */
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args.ifp = ifp;
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args.eh = &save_eh; /* MAC header for bridged/MAC packets */
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args.inp = inp; /* used by ipfw uid/gid/jail rules */
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i = ipfw_chk(&args);
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m = args.m;
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if (m != NULL) {
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args.inp = inp;
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again:
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if (!mem) {
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/*
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* Restore Ethernet header, as needed, in case the
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* mbuf chain was replaced by ipfw.
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* Fetch start point from rule, if any.
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* Remove the tag if present.
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*/
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M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
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if (m == NULL) {
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*m0 = NULL;
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return (0);
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struct m_tag *mtag;
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mtag = m_tag_locate(*p.m, MTAG_IPFW_RULE, 0, NULL);
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if (mtag != NULL) {
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args.rule = *((struct ipfw_rule_ref *)(mtag+1));
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m_tag_delete(*p.m, mtag);
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if (args.rule.info & IPFW_ONEPASS)
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return (PFIL_PASS);
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args.flags |= IPFW_ARGS_REF;
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}
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if (eh != mtod(m, struct ether_header *))
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bcopy(&save_eh, mtod(m, struct ether_header *),
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ETHER_HDR_LEN);
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args.m = *p.m;
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}
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*m0 = m;
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ipfw = ipfw_chk(&args);
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ret = PFIL_PASS;
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/* Check result of ipfw_chk() */
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switch (i) {
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switch (ipfw) {
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case IP_FW_PASS:
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break;
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@ -403,9 +384,16 @@ ipfw_check_frame(struct mbuf **m0, struct ifnet *ifp, int flags,
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ret = PFIL_DROPPED;
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break;
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}
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*m0 = NULL;
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if (mem) {
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if (pfil_realloc(&p, flags, ifp) != 0) {
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ret = PFIL_DROPPED;
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break;
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}
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mem = false;
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realloc = true;
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}
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MPASS(args.flags & IPFW_ARGS_REF);
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ip_dn_io_ptr(&m, &args);
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ip_dn_io_ptr(p.m, &args);
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return (PFIL_CONSUMED);
|
||||
|
||||
case IP_FW_NGTEE:
|
||||
@ -414,9 +402,17 @@ ipfw_check_frame(struct mbuf **m0, struct ifnet *ifp, int flags,
|
||||
ret = PFIL_DROPPED;
|
||||
break;
|
||||
}
|
||||
if (mem) {
|
||||
if (pfil_realloc(&p, flags, ifp) != 0) {
|
||||
ret = PFIL_DROPPED;
|
||||
break;
|
||||
}
|
||||
mem = false;
|
||||
realloc = true;
|
||||
}
|
||||
MPASS(args.flags & IPFW_ARGS_REF);
|
||||
(void )ng_ipfw_input_p(m0, &args, i == IP_FW_NGTEE);
|
||||
if (i == IP_FW_NGTEE) /* ignore errors for NGTEE */
|
||||
(void )ng_ipfw_input_p(p.m, &args, ipfw == IP_FW_NGTEE);
|
||||
if (ipfw == IP_FW_NGTEE) /* ignore errors for NGTEE */
|
||||
goto again; /* continue with packet */
|
||||
ret = PFIL_CONSUMED;
|
||||
break;
|
||||
@ -425,12 +421,15 @@ ipfw_check_frame(struct mbuf **m0, struct ifnet *ifp, int flags,
|
||||
KASSERT(0, ("%s: unknown retval", __func__));
|
||||
}
|
||||
|
||||
if (ret != PFIL_PASS) {
|
||||
if (*m0)
|
||||
FREE_PKT(*m0);
|
||||
*m0 = NULL;
|
||||
if (!mem && ret != PFIL_PASS) {
|
||||
if (*p.m)
|
||||
FREE_PKT(*p.m);
|
||||
*p.m = NULL;
|
||||
}
|
||||
|
||||
if (realloc && ret == PFIL_PASS)
|
||||
ret = PFIL_REALLOCED;
|
||||
|
||||
return (ret);
|
||||
}
|
||||
|
||||
@ -545,7 +544,7 @@ ipfw_hook(int onoff, int pf)
|
||||
pfil_hook_t *h;
|
||||
|
||||
pha.pa_version = PFIL_VERSION;
|
||||
pha.pa_flags = PFIL_IN | PFIL_OUT;
|
||||
pha.pa_flags = PFIL_IN | PFIL_OUT | PFIL_MEMPTR;
|
||||
pha.pa_modname = "ipfw";
|
||||
pha.pa_ruleset = NULL;
|
||||
|
||||
|
||||
@ -111,14 +111,11 @@ struct ip_fw_args {
|
||||
struct inpcb *inp;
|
||||
union {
|
||||
/*
|
||||
* We don't support forwarding on layer2, thus we can
|
||||
* keep eh pointer in this union.
|
||||
* next_hop[6] pointers can be used to point to next hop
|
||||
* stored in rule's opcode to avoid copying into hopstore.
|
||||
* Also, it is expected that all 0x1-0x10 flags are mutually
|
||||
* exclusive.
|
||||
*/
|
||||
struct ether_header *eh; /* for bridged packets */
|
||||
struct sockaddr_in *next_hop;
|
||||
struct sockaddr_in6 *next_hop6;
|
||||
/* ipfw next hop storage */
|
||||
@ -129,8 +126,10 @@ struct ip_fw_args {
|
||||
uint16_t sin6_port;
|
||||
} hopstore6;
|
||||
};
|
||||
|
||||
struct mbuf *m; /* the mbuf chain */
|
||||
union {
|
||||
struct mbuf *m; /* the mbuf chain */
|
||||
void *mem; /* or memory pointer */
|
||||
};
|
||||
struct ipfw_flow_id f_id; /* grabbed from IP header */
|
||||
};
|
||||
|
||||
@ -164,10 +163,11 @@ struct ip_fw_chain;
|
||||
|
||||
void ipfw_bpf_init(int);
|
||||
void ipfw_bpf_uninit(int);
|
||||
void ipfw_bpf_tap(u_char *, u_int);
|
||||
void ipfw_bpf_mtap(struct mbuf *);
|
||||
void ipfw_bpf_mtap2(void *, u_int, struct mbuf *);
|
||||
void ipfw_log(struct ip_fw_chain *chain, struct ip_fw *f, u_int hlen,
|
||||
struct ip_fw_args *args, struct mbuf *m,
|
||||
u_short offset, uint32_t tablearg, struct ip *ip);
|
||||
struct ip_fw_args *args, u_short offset, uint32_t tablearg, struct ip *ip);
|
||||
VNET_DECLARE(u_int64_t, norule_counter);
|
||||
#define V_norule_counter VNET(norule_counter)
|
||||
VNET_DECLARE(int, verbose_limit);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user