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From 6d74c2d0ceadef2eb1c43c2da47f1d5b732adf8c Mon Sep 17 00:00:00 2001
From: Pavel Zhukov <pzhukov@redhat.com>
Date: Thu, 21 Feb 2019 10:34:21 +0100
Subject: [PATCH 14/26] IPoIB support (#660681)
Cc: pzhukov@redhat.com
(Submitted to dhcp-bugs@isc.org - [ISC-Bugs #24249])
---
client/dhclient.c | 32 +++++++
common/bpf.c | 32 +++++++
common/discover.c | 4 +-
common/lpf.c | 262 +++++++++++++++++++++++++++++++++++++++++++++++++-----
common/socket.c | 8 +-
includes/dhcpd.h | 6 +-
6 files changed, 315 insertions(+), 29 deletions(-)
diff --git a/client/dhclient.c b/client/dhclient.c
index 301132c..dc9080e 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -205,6 +205,8 @@ static const char use_v6command[] = "Command not used for DHCPv4: %s";
#define DHCLIENT_USAGEH "{--version|--help|-h}"
+static void setup_ib_interface(struct interface_info *ip);
+
static void
usage(const char *sfmt, const char *sarg)
{
@@ -1191,6 +1193,13 @@ main(int argc, char **argv) {
}
srandom(seed + cur_time + (unsigned)getpid());
+ /* Setup specific Infiniband options */
+ for (ip = interfaces; ip; ip = ip->next) {
+ if (ip->client &&
+ (ip->hw_address.hbuf[0] == HTYPE_INFINIBAND)) {
+ setup_ib_interface(ip);
+ }
+ }
/*
* Establish a default DUID. We always do so for v6 and
@@ -1486,6 +1495,29 @@ int find_subnet (struct subnet **sp,
return 0;
}
+static void setup_ib_interface(struct interface_info *ip)
+{
+ struct group *g;
+
+ /* Set the broadcast flag */
+ ip->client->config->bootp_broadcast_always = 1;
+
+ /*
+ * Find out if a dhcp-client-identifier option was specified either
+ * in the config file or on the command line
+ */
+ for (g = ip->client->config->on_transmission; g != NULL; g = g->next) {
+ if ((g->statements != NULL) &&
+ (strcmp(g->statements->data.option->option->name,
+ "dhcp-client-identifier") == 0)) {
+ return;
+ }
+ }
+
+ /* No client ID specified */
+ log_fatal("dhcp-client-identifier must be specified for InfiniBand");
+}
+
/* Individual States:
*
* Each routine is called from the dhclient_state_machine() in one of
diff --git a/common/bpf.c b/common/bpf.c
index ffbd09a..568e3d9 100644
--- a/common/bpf.c
+++ b/common/bpf.c
@@ -237,11 +237,43 @@ int dhcp_bpf_relay_filter_len =
sizeof dhcp_bpf_relay_filter / sizeof (struct bpf_insn);
#endif
+/* Packet filter program for DHCP over Infiniband.
+ *
+ * XXX
+ * Changes to the filter program may require changes to the constant offsets
+ * used in lpf_gen_filter_setup to patch the port in the BPF program!
+ * XXX
+ */
+struct bpf_insn dhcp_ib_bpf_filter [] = {
+ /* Packet filter for Infiniband */
+ /* Make sure it's a UDP packet... */
+ BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 9),
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 6),
+
+ /* Make sure this isn't a fragment... */
+ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 6),
+ BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 4, 0),
+
+ /* Get the IP header length... */
+ BPF_STMT(BPF_LDX + BPF_B + BPF_MSH, 0),
+
+ /* Make sure it's to the right port... */
+ BPF_STMT(BPF_LD + BPF_H + BPF_IND, 2),
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1),
+
+ /* If we passed all the tests, ask for the whole packet. */
+ BPF_STMT(BPF_RET + BPF_K, (u_int)-1),
+
+ /* Otherwise, drop it. */
+ BPF_STMT(BPF_RET + BPF_K, 0),
+};
+
#if defined (DEC_FDDI)
struct bpf_insn *bpf_fddi_filter = NULL;
#endif
int dhcp_bpf_filter_len = sizeof dhcp_bpf_filter / sizeof (struct bpf_insn);
+int dhcp_ib_bpf_filter_len = sizeof dhcp_ib_bpf_filter / sizeof (struct bpf_insn);
#if defined (HAVE_TR_SUPPORT)
struct bpf_insn dhcp_bpf_tr_filter [] = {
/* accept all token ring packets due to variable length header */
diff --git a/common/discover.c b/common/discover.c
index 6ef8852..65881fc 100644
--- a/common/discover.c
+++ b/common/discover.c
@@ -894,7 +894,7 @@ discover_interfaces(int state) {
if_register_send(tmp);
} else {
/* get_hw_addr() was called by register. */
- get_hw_addr(tmp->name, &tmp->hw_address);
+ get_hw_addr(tmp);
}
break;
#ifdef DHCPv6
@@ -907,7 +907,7 @@ discover_interfaces(int state) {
so now we have to call it explicitly
to not leave the hardware address unknown
(some code expects it cannot be. */
- get_hw_addr(tmp->name, &tmp->hw_address);
+ get_hw_addr(tmp);
} else {
if_register_linklocal6(tmp);
}
diff --git a/common/lpf.c b/common/lpf.c
index b0ed01c..b732a86 100644
--- a/common/lpf.c
+++ b/common/lpf.c
@@ -45,6 +45,17 @@
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
+#include <ifaddrs.h>
+
+/* Default broadcast address for IPoIB */
+static unsigned char default_ib_bcast_addr[20] = {
+ 0x00, 0xff, 0xff, 0xff,
+ 0xff, 0x12, 0x40, 0x1b,
+ 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00,
+ 0xff, 0xff, 0xff, 0xff
+};
+
#endif
#if defined (USE_LPF_SEND) || defined (USE_LPF_RECEIVE)
@@ -78,10 +89,20 @@ int if_register_lpf (info)
struct sockaddr common;
} sa;
struct ifreq ifr;
+ int type;
+ int protocol;
+
+ get_hw_addr(info);
+ if (info->hw_address.hbuf[0] == HTYPE_INFINIBAND) {
+ type = SOCK_DGRAM;
+ protocol = ETHERTYPE_IP;
+ } else {
+ type = SOCK_RAW;
+ protocol = ETH_P_ALL;
+ }
/* Make an LPF socket. */
- if ((sock = socket(PF_PACKET, SOCK_RAW,
- htons((short)ETH_P_ALL))) < 0) {
+ if ((sock = socket(PF_PACKET, type, htons((short)protocol))) < 0) {
if (errno == ENOPROTOOPT || errno == EPROTONOSUPPORT ||
errno == ESOCKTNOSUPPORT || errno == EPFNOSUPPORT ||
errno == EAFNOSUPPORT || errno == EINVAL) {
@@ -104,6 +125,7 @@ int if_register_lpf (info)
/* Bind to the interface name */
memset (&sa, 0, sizeof sa);
sa.ll.sll_family = AF_PACKET;
+ sa.ll.sll_protocol = htons(protocol);
sa.ll.sll_ifindex = ifr.ifr_ifindex;
if (bind (sock, &sa.common, sizeof sa)) {
if (errno == ENOPROTOOPT || errno == EPROTONOSUPPORT ||
@@ -120,8 +142,6 @@ int if_register_lpf (info)
}
- get_hw_addr(info->name, &info->hw_address);
-
return sock;
}
#endif /* USE_LPF_SEND || USE_LPF_RECEIVE */
@@ -176,6 +196,8 @@ void if_deregister_send (info)
in bpf includes... */
extern struct sock_filter dhcp_bpf_filter [];
extern int dhcp_bpf_filter_len;
+extern struct sock_filter dhcp_ib_bpf_filter [];
+extern int dhcp_ib_bpf_filter_len;
#if defined(RELAY_PORT)
extern struct sock_filter dhcp_bpf_relay_filter [];
@@ -199,11 +221,12 @@ void if_register_receive (info)
#ifdef PACKET_AUXDATA
{
int val = 1;
-
- if (setsockopt(info->rfdesc, SOL_PACKET, PACKET_AUXDATA,
- &val, sizeof(val)) < 0) {
- if (errno != ENOPROTOOPT) {
- log_fatal ("Failed to set auxiliary packet data: %m");
+ if (info->hw_address.hbuf[0] != HTYPE_INFINIBAND) {
+ if (setsockopt(info->rfdesc, SOL_PACKET, PACKET_AUXDATA,
+ &val, sizeof(val)) < 0) {
+ if (errno != ENOPROTOOPT) {
+ log_fatal ("Failed to set auxiliary packet data: %m");
+ }
}
}
}
@@ -330,6 +353,54 @@ static void lpf_tr_filter_setup (info)
#endif /* USE_LPF_RECEIVE */
#ifdef USE_LPF_SEND
+ssize_t send_packet_ib(interface, packet, raw, len, from, to, hto)
+ struct interface_info *interface;
+ struct packet *packet;
+ struct dhcp_packet *raw;
+ size_t len;
+ struct in_addr from;
+ struct sockaddr_in *to;
+ struct hardware *hto;
+{
+ unsigned ibufp = 0;
+ double ih [1536 / sizeof (double)];
+ unsigned char *buf = (unsigned char *)ih;
+ ssize_t result;
+
+ union sockunion {
+ struct sockaddr sa;
+ struct sockaddr_ll sll;
+ struct sockaddr_storage ss;
+ } su;
+
+ assemble_udp_ip_header (interface, buf, &ibufp, from.s_addr,
+ to->sin_addr.s_addr, to->sin_port,
+ (unsigned char *)raw, len);
+ memcpy (buf + ibufp, raw, len);
+
+ memset(&su, 0, sizeof(su));
+ su.sll.sll_family = AF_PACKET;
+ su.sll.sll_protocol = htons(ETHERTYPE_IP);
+
+ if (!(su.sll.sll_ifindex = if_nametoindex(interface->name))) {
+ errno = ENOENT;
+ log_error ("send_packet_ib: %m - failed to get if index");
+ return -1;
+ }
+
+ su.sll.sll_hatype = htons(HTYPE_INFINIBAND);
+ su.sll.sll_halen = sizeof(interface->bcast_addr);
+ memcpy(&su.sll.sll_addr, interface->bcast_addr, 20);
+
+ result = sendto(interface->wfdesc, buf, ibufp + len, 0,
+ &su.sa, sizeof(su));
+
+ if (result < 0)
+ log_error ("send_packet_ib: %m");
+
+ return result;
+}
+
ssize_t send_packet (interface, packet, raw, len, from, to, hto)
struct interface_info *interface;
struct packet *packet;
@@ -350,6 +421,11 @@ ssize_t send_packet (interface, packet, raw, len, from, to, hto)
return send_fallback (interface, packet, raw,
len, from, to, hto);
+ if (interface->hw_address.hbuf[0] == HTYPE_INFINIBAND) {
+ return send_packet_ib(interface, packet, raw, len, from,
+ to, hto);
+ }
+
if (hto == NULL && interface->anycast_mac_addr.hlen)
hto = &interface->anycast_mac_addr;
@@ -370,6 +446,42 @@ ssize_t send_packet (interface, packet, raw, len, from, to, hto)
#endif /* USE_LPF_SEND */
#ifdef USE_LPF_RECEIVE
+ssize_t receive_packet_ib (interface, buf, len, from, hfrom)
+ struct interface_info *interface;
+ unsigned char *buf;
+ size_t len;
+ struct sockaddr_in *from;
+ struct hardware *hfrom;
+{
+ int length = 0;
+ int offset = 0;
+ unsigned char ibuf [1536];
+ unsigned bufix = 0;
+ unsigned paylen;
+
+ length = read(interface->rfdesc, ibuf, sizeof(ibuf));
+
+ if (length <= 0)
+ return length;
+
+ offset = decode_udp_ip_header(interface, ibuf, bufix, from,
+ (unsigned)length, &paylen, 0);
+
+ if (offset < 0)
+ return 0;
+
+ bufix += offset;
+ length -= offset;
+
+ if (length < paylen)
+ log_fatal("Internal inconsistency at %s:%d.", MDL);
+
+ /* Copy out the data in the packet... */
+ memcpy(buf, &ibuf[bufix], paylen);
+
+ return (ssize_t)paylen;
+}
+
ssize_t receive_packet (interface, buf, len, from, hfrom)
struct interface_info *interface;
unsigned char *buf;
@@ -408,6 +520,10 @@ ssize_t receive_packet (interface, buf, len, from, hfrom)
};
#endif /* PACKET_AUXDATA */
+ if (interface->hw_address.hbuf[0] == HTYPE_INFINIBAND) {
+ return receive_packet_ib(interface, buf, len, from, hfrom);
+ }
+
length = recvmsg (interface->rfdesc, &msg, 0);
if (length <= 0)
return length;
@@ -521,11 +637,33 @@ void maybe_setup_fallback ()
#endif
#if defined (USE_LPF_RECEIVE) || defined (USE_LPF_HWADDR)
-void
-get_hw_addr(const char *name, struct hardware *hw) {
+struct sockaddr_ll *
+get_ll (struct ifaddrs *ifaddrs, struct ifaddrs **ifa, char *name)
+{
+ for (*ifa = ifaddrs; *ifa != NULL; *ifa = (*ifa)->ifa_next) {
+ if ((*ifa)->ifa_addr == NULL)
+ continue;
+
+ if ((*ifa)->ifa_addr->sa_family != AF_PACKET)
+ continue;
+
+ if ((*ifa)->ifa_flags & IFF_LOOPBACK)
+ continue;
+
+ if (strcmp((*ifa)->ifa_name, name) == 0)
+ return (struct sockaddr_ll *)(void *)(*ifa)->ifa_addr;
+ }
+ *ifa = NULL;
+ return NULL;
+}
+
+struct sockaddr_ll *
+ioctl_get_ll(char *name)
+{
int sock;
struct ifreq tmp;
- struct sockaddr *sa;
+ struct sockaddr *sa = NULL;
+ struct sockaddr_ll *sll = NULL;
if (strlen(name) >= sizeof(tmp.ifr_name)) {
log_fatal("Device name too long: \"%s\"", name);
@@ -539,16 +677,61 @@ get_hw_addr(const char *name, struct hardware *hw) {
memset(&tmp, 0, sizeof(tmp));
strcpy(tmp.ifr_name, name);
if (ioctl(sock, SIOCGIFHWADDR, &tmp) < 0) {
- log_fatal("Error getting hardware address for \"%s\": %m",
+ log_fatal("Error getting hardware address for \"%s\": %m",
name);
}
+ close(sock);
sa = &tmp.ifr_hwaddr;
- switch (sa->sa_family) {
+ // needs to be freed outside this function
+ sll = dmalloc (sizeof (struct sockaddr_ll), MDL);
+ if (!sll)
+ log_fatal("Unable to allocate memory for link layer address");
+ memcpy(&sll->sll_hatype, &sa->sa_family, sizeof (sll->sll_hatype));
+ memcpy(sll->sll_addr, sa->sa_data, sizeof (sll->sll_addr));
+ switch (sll->sll_hatype) {
+ case ARPHRD_INFINIBAND:
+ sll->sll_halen = HARDWARE_ADDR_LEN_IOCTL;
+ break;
+ default:
+ break;
+ }
+ return sll;
+}
+
+void
+get_hw_addr(struct interface_info *info)
+{
+ struct hardware *hw = &info->hw_address;
+ char *name = info->name;
+ struct ifaddrs *ifaddrs = NULL;
+ struct ifaddrs *ifa = NULL;
+ struct sockaddr_ll *sll = NULL;
+ int sll_allocated = 0;
+ char *dup = NULL;
+ char *colon = NULL;
+
+ if (getifaddrs(&ifaddrs) == -1)
+ log_fatal("Failed to get interfaces");
+
+ if ((sll = get_ll(ifaddrs, &ifa, name)) == NULL) {
+ /*
+ * We were unable to get link-layer address for name.
+ * Fall back to ioctl(SIOCGIFHWADDR).
+ */
+ sll = ioctl_get_ll(name);
+ if (sll != NULL)
+ sll_allocated = 1;
+ else
+ // shouldn't happen
+ log_fatal("Unexpected internal error");
+ }
+
+ switch (sll->sll_hatype) {
case ARPHRD_ETHER:
hw->hlen = 7;
hw->hbuf[0] = HTYPE_ETHER;
- memcpy(&hw->hbuf[1], sa->sa_data, 6);
+ memcpy(&hw->hbuf[1], sll->sll_addr, 6);
break;
case ARPHRD_IEEE802:
#ifdef ARPHRD_IEEE802_TR
@@ -556,18 +739,50 @@ get_hw_addr(const char *name, struct hardware *hw) {
#endif /* ARPHRD_IEEE802_TR */
hw->hlen = 7;
hw->hbuf[0] = HTYPE_IEEE802;
- memcpy(&hw->hbuf[1], sa->sa_data, 6);
+ memcpy(&hw->hbuf[1], sll->sll_addr, 6);
break;
case ARPHRD_FDDI:
hw->hlen = 7;
hw->hbuf[0] = HTYPE_FDDI;
- memcpy(&hw->hbuf[1], sa->sa_data, 6);
+ memcpy(&hw->hbuf[1], sll->sll_addr, 6);
+ break;
+ case ARPHRD_INFINIBAND:
+ dup = strdup(name);
+ /* Aliased infiniband interface is special case where
+ * neither get_ll() nor ioctl_get_ll() get's correct hw
+ * address, so we have to truncate the :0 and run
+ * get_ll() again for the rest.
+ */
+ if ((colon = strchr(dup, ':')) != NULL) {
+ *colon = '\0';
+ if ((sll = get_ll(ifaddrs, &ifa, dup)) == NULL)
+ log_fatal("Error getting hardware address for \"%s\": %m", name);
+ }
+ free (dup);
+ /* For Infiniband, save the broadcast address and store
+ * the port GUID into the hardware address.
+ */
+ if (ifa && (ifa->ifa_flags & IFF_BROADCAST)) {
+ struct sockaddr_ll *bll;
+
+ bll = (struct sockaddr_ll *)ifa->ifa_broadaddr;
+ memcpy(&info->bcast_addr, bll->sll_addr, 20);
+ } else {
+ memcpy(&info->bcast_addr, default_ib_bcast_addr,
+ 20);
+ }
+
+ hw->hlen = HARDWARE_ADDR_LEN_IOCTL + 1;
+ hw->hbuf[0] = HTYPE_INFINIBAND;
+ memcpy(&hw->hbuf[1],
+ &sll->sll_addr[sll->sll_halen - HARDWARE_ADDR_LEN_IOCTL],
+ HARDWARE_ADDR_LEN_IOCTL);
break;
#if defined(ARPHRD_PPP)
case ARPHRD_PPP:
if (local_family != AF_INET6)
- log_fatal("Unsupported device type %d for \"%s\"",
- sa->sa_family, name);
+ log_fatal("local_family != AF_INET6 for \"%s\"",
+ name);
hw->hlen = 0;
hw->hbuf[0] = HTYPE_RESERVED;
/* 0xdeadbeef should never occur on the wire,
@@ -580,10 +795,13 @@ get_hw_addr(const char *name, struct hardware *hw) {
break;
#endif
default:
- log_fatal("Unsupported device type %ld for \"%s\"",
- (long int)sa->sa_family, name);
+ freeifaddrs(ifaddrs);
+ log_fatal("Unsupported device type %hu for \"%s\"",
+ sll->sll_hatype, name);
}
- close(sock);
+ if (sll_allocated)
+ dfree(sll, MDL);
+ freeifaddrs(ifaddrs);
}
#endif
diff --git a/common/socket.c b/common/socket.c
index 483eb9c..6e1caac 100644
--- a/common/socket.c
+++ b/common/socket.c
@@ -350,7 +350,7 @@ void if_register_send (info)
info->wfdesc = if_register_socket(info, AF_INET, 0, NULL);
/* If this is a normal IPv4 address, get the hardware address. */
if (strcmp(info->name, "fallback") != 0)
- get_hw_addr(info->name, &info->hw_address);
+ get_hw_addr(info);
#if defined (USE_SOCKET_FALLBACK)
/* Fallback only registers for send, but may need to receive as
well. */
@@ -413,7 +413,7 @@ void if_register_receive (info)
#endif /* IP_PKTINFO... */
/* If this is a normal IPv4 address, get the hardware address. */
if (strcmp(info->name, "fallback") != 0)
- get_hw_addr(info->name, &info->hw_address);
+ get_hw_addr(info);
if (!quiet_interface_discovery)
log_info ("Listening on Socket/%s%s%s",
@@ -567,7 +567,7 @@ if_register6(struct interface_info *info, int do_multicast) {
if (req_multi)
if_register_multicast(info);
- get_hw_addr(info->name, &info->hw_address);
+ get_hw_addr(info);
if (!quiet_interface_discovery) {
if (info->shared_network != NULL) {
@@ -623,7 +623,7 @@ if_register_linklocal6(struct interface_info *info) {
info->rfdesc = sock;
info->wfdesc = sock;
- get_hw_addr(info->name, &info->hw_address);
+ get_hw_addr(info);
if (!quiet_interface_discovery) {
if (info->shared_network != NULL) {
diff --git a/includes/dhcpd.h b/includes/dhcpd.h
index faa9251..0c1a0aa 100644
--- a/includes/dhcpd.h
+++ b/includes/dhcpd.h
@@ -485,6 +485,9 @@ struct packet {
#define HARDWARE_ADDR_LEN 20
+/* ioctl limits hardware addresses to 8 bytes */
+#define HARDWARE_ADDR_LEN_IOCTL 8
+
struct hardware {
u_int8_t hlen;
u_int8_t hbuf[HARDWARE_ADDR_LEN + 1];
@@ -1365,6 +1368,7 @@ struct interface_info {
struct shared_network *shared_network;
/* Networks connected to this interface. */
struct hardware hw_address; /* Its physical address. */
+ u_int8_t bcast_addr[20]; /* Infiniband broadcast address */
struct in_addr *addresses; /* Addresses associated with this
* interface.
*/
@@ -2633,7 +2637,7 @@ void print_dns_status (int, struct dhcp_ddns_cb *, isc_result_t);
#endif
const char *print_time(TIME);
-void get_hw_addr(const char *name, struct hardware *hw);
+void get_hw_addr(struct interface_info *info);
char *buf_to_hex (const unsigned char *s, unsigned len,
const char *file, int line);
char *format_lease_id(const unsigned char *s, unsigned len, int format,
--
2.14.5
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