X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fpackets.h;h=8dd3ebff25d0dd251cd17b30d5653f1b2c03ab45;hb=305b76debf72120672a8ba81d3356b6dccb1da9a;hp=fb044071780624ec8889131e900d3e74251b0873;hpb=d295e8e97acae13552a5b220d3fbcff8201064a2;p=sliver-openvswitch.git diff --git a/lib/packets.h b/lib/packets.h index fb0440717..8dd3ebff2 100644 --- a/lib/packets.h +++ b/lib/packets.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -18,13 +18,18 @@ #define PACKETS_H 1 #include +#include +#include #include #include #include "compiler.h" +#include "flow.h" +#include "openvswitch/types.h" #include "random.h" #include "util.h" struct ofpbuf; +struct ds; bool dpid_from_string(const char *s, uint64_t *dpidp); @@ -34,7 +39,10 @@ static const uint8_t eth_addr_broadcast[ETH_ADDR_LEN] OVS_UNUSED = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; static const uint8_t eth_addr_stp[ETH_ADDR_LEN] OVS_UNUSED - = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x01 }; + = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00 }; + +static const uint8_t eth_addr_lacp[ETH_ADDR_LEN] OVS_UNUSED + = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02 }; static inline bool eth_addr_is_broadcast(const uint8_t ea[6]) { @@ -49,17 +57,39 @@ static inline bool eth_addr_is_local(const uint8_t ea[6]) { /* Local if it is either a locally administered address or a Nicira random * address. */ - return !!(ea[0] & 2) - || (ea[0] == 0x00 && ea[1] == 0x23 && ea[2] == 0x20 && !!(ea[3] & 0x80)); + return ea[0] & 2 + || (ea[0] == 0x00 && ea[1] == 0x23 && ea[2] == 0x20 && ea[3] & 0x80); } static inline bool eth_addr_is_zero(const uint8_t ea[6]) { return !(ea[0] | ea[1] | ea[2] | ea[3] | ea[4] | ea[5]); } + +static inline int eth_mask_is_exact(const uint8_t ea[ETH_ADDR_LEN]) +{ + return (ea[0] & ea[1] & ea[2] & ea[3] & ea[4] & ea[5]) == 0xff; +} + +static inline int eth_addr_compare_3way(const uint8_t a[ETH_ADDR_LEN], + const uint8_t b[ETH_ADDR_LEN]) +{ + return memcmp(a, b, ETH_ADDR_LEN); +} static inline bool eth_addr_equals(const uint8_t a[ETH_ADDR_LEN], const uint8_t b[ETH_ADDR_LEN]) { - return !memcmp(a, b, ETH_ADDR_LEN); + return !eth_addr_compare_3way(a, b); +} +static inline bool eth_addr_equal_except(const uint8_t a[ETH_ADDR_LEN], + const uint8_t b[ETH_ADDR_LEN], + const uint8_t mask[ETH_ADDR_LEN]) +{ + return !(((a[0] ^ b[0]) & mask[0]) + || ((a[1] ^ b[1]) & mask[1]) + || ((a[2] ^ b[2]) & mask[2]) + || ((a[3] ^ b[3]) & mask[3]) + || ((a[4] ^ b[4]) & mask[4]) + || ((a[5] ^ b[5]) & mask[5])); } static inline uint64_t eth_addr_to_uint64(const uint8_t ea[ETH_ADDR_LEN]) { @@ -101,23 +131,21 @@ static inline void eth_addr_nicira_random(uint8_t ea[ETH_ADDR_LEN]) /* Set the top bit to indicate random Nicira address. */ ea[3] |= 0x80; } -/* Returns true if 'ea' is a reserved multicast address, that a bridge must - * never forward, false otherwise. */ -static inline bool eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN]) -{ - return (ea[0] == 0x01 - && ea[1] == 0x80 - && ea[2] == 0xc2 - && ea[3] == 0x00 - && ea[4] == 0x00 - && (ea[5] & 0xf0) == 0x00); -} +bool eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN]); bool eth_addr_from_string(const char *, uint8_t ea[ETH_ADDR_LEN]); -void compose_benign_packet(struct ofpbuf *, const char *tag, - uint16_t snap_type, - const uint8_t eth_src[ETH_ADDR_LEN]); +void compose_rarp(struct ofpbuf *, const uint8_t eth_src[ETH_ADDR_LEN]); + +void eth_push_vlan(struct ofpbuf *, ovs_be16 tci); +void eth_pop_vlan(struct ofpbuf *); + +const char *eth_from_hex(const char *hex, struct ofpbuf **packetp); +void eth_format_masked(const uint8_t eth[ETH_ADDR_LEN], + const uint8_t mask[ETH_ADDR_LEN], struct ds *s); +void eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN], + const uint8_t mask[ETH_ADDR_LEN], + uint8_t dst[ETH_ADDR_LEN]); /* Example: * @@ -149,7 +177,18 @@ void compose_benign_packet(struct ofpbuf *, const char *tag, #define ETH_TYPE_IP 0x0800 #define ETH_TYPE_ARP 0x0806 -#define ETH_TYPE_VLAN 0x8100 +#define ETH_TYPE_VLAN_8021Q 0x8100 +#define ETH_TYPE_VLAN ETH_TYPE_VLAN_8021Q +#define ETH_TYPE_VLAN_8021AD 0x88a8 +#define ETH_TYPE_IPV6 0x86dd +#define ETH_TYPE_LACP 0x8809 +#define ETH_TYPE_RARP 0x8035 +#define ETH_TYPE_MPLS 0x8847 +#define ETH_TYPE_MPLS_MCAST 0x8848 + +/* Minimum value for an Ethernet type. Values below this are IEEE 802.2 frame + * lengths. */ +#define ETH_TYPE_MIN 0x600 #define ETH_HEADER_LEN 14 #define ETH_PAYLOAD_MIN 46 @@ -160,7 +199,7 @@ void compose_benign_packet(struct ofpbuf *, const char *tag, struct eth_header { uint8_t eth_dst[ETH_ADDR_LEN]; uint8_t eth_src[ETH_ADDR_LEN]; - uint16_t eth_type; + ovs_be16 eth_type; } __attribute__((packed)); BUILD_ASSERT_DECL(ETH_HEADER_LEN == sizeof(struct eth_header)); @@ -181,7 +220,7 @@ BUILD_ASSERT_DECL(LLC_HEADER_LEN == sizeof(struct llc_header)); #define SNAP_HEADER_LEN 5 struct snap_header { uint8_t snap_org[3]; - uint16_t snap_type; + ovs_be16 snap_type; } __attribute__((packed)); BUILD_ASSERT_DECL(SNAP_HEADER_LEN == sizeof(struct snap_header)); @@ -198,10 +237,28 @@ BUILD_ASSERT_DECL(LLC_SNAP_HEADER_LEN == sizeof(struct llc_snap_header)); #define VLAN_PCP_MASK 0xe000 #define VLAN_PCP_SHIFT 13 +#define VLAN_CFI 0x1000 + +/* Given the vlan_tci field from an 802.1Q header, in network byte order, + * returns the VLAN ID in host byte order. */ +static inline uint16_t +vlan_tci_to_vid(ovs_be16 vlan_tci) +{ + return (ntohs(vlan_tci) & VLAN_VID_MASK) >> VLAN_VID_SHIFT; +} + +/* Given the vlan_tci field from an 802.1Q header, in network byte order, + * returns the priority code point (PCP) in host byte order. */ +static inline int +vlan_tci_to_pcp(ovs_be16 vlan_tci) +{ + return (ntohs(vlan_tci) & VLAN_PCP_MASK) >> VLAN_PCP_SHIFT; +} + #define VLAN_HEADER_LEN 4 struct vlan_header { - uint16_t vlan_tci; /* Lowest 12 bits are VLAN ID. */ - uint16_t vlan_next_type; + ovs_be16 vlan_tci; /* Lowest 12 bits are VLAN ID. */ + ovs_be16 vlan_next_type; }; BUILD_ASSERT_DECL(VLAN_HEADER_LEN == sizeof(struct vlan_header)); @@ -209,35 +266,70 @@ BUILD_ASSERT_DECL(VLAN_HEADER_LEN == sizeof(struct vlan_header)); struct vlan_eth_header { uint8_t veth_dst[ETH_ADDR_LEN]; uint8_t veth_src[ETH_ADDR_LEN]; - uint16_t veth_type; /* Always htons(ETH_TYPE_VLAN). */ - uint16_t veth_tci; /* Lowest 12 bits are VLAN ID. */ - uint16_t veth_next_type; + ovs_be16 veth_type; /* Always htons(ETH_TYPE_VLAN). */ + ovs_be16 veth_tci; /* Lowest 12 bits are VLAN ID. */ + ovs_be16 veth_next_type; } __attribute__((packed)); BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header)); -/* The "(void) (ip)[0]" below has no effect on the value, since it's the first - * argument of a comma expression, but it makes sure that 'ip' is a pointer. - * This is useful since a common mistake is to pass an integer instead of a - * pointer to IP_ARGS. */ -#define IP_FMT "%"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8 +#define IP_FMT "%"PRIu32".%"PRIu32".%"PRIu32".%"PRIu32 #define IP_ARGS(ip) \ - ((void) (ip)[0], ((uint8_t *) ip)[0]), \ - ((uint8_t *) ip)[1], \ - ((uint8_t *) ip)[2], \ - ((uint8_t *) ip)[3] + ntohl(ip) >> 24, \ + (ntohl(ip) >> 16) & 0xff, \ + (ntohl(ip) >> 8) & 0xff, \ + ntohl(ip) & 0xff + +/* Example: + * + * char *string = "1 33.44.55.66 2"; + * ovs_be32 ip; + * int a, b; + * + * if (sscanf(string, "%d"IP_SCAN_FMT"%d", + * &a, IP_SCAN_ARGS(&ip), &b) == 1 + IP_SCAN_COUNT + 1) { + * ... + * } + */ +#define IP_SCAN_FMT "%"SCNu8".%"SCNu8".%"SCNu8".%"SCNu8 +#define IP_SCAN_ARGS(ip) \ + ((void) (ovs_be32) *(ip), &((uint8_t *) ip)[0]), \ + &((uint8_t *) ip)[1], \ + &((uint8_t *) ip)[2], \ + &((uint8_t *) ip)[3] +#define IP_SCAN_COUNT 4 + +/* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N + * high-order 1-bits and 32-N low-order 0-bits. */ +static inline bool +ip_is_cidr(ovs_be32 netmask) +{ + uint32_t x = ~ntohl(netmask); + return !(x & (x + 1)); +} +static inline bool +ip_is_multicast(ovs_be32 ip) +{ + return (ip & htonl(0xf0000000)) == htonl(0xe0000000); +} +int ip_count_cidr_bits(ovs_be32 netmask); +void ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *); #define IP_VER(ip_ihl_ver) ((ip_ihl_ver) >> 4) #define IP_IHL(ip_ihl_ver) ((ip_ihl_ver) & 15) #define IP_IHL_VER(ihl, ver) (((ver) << 4) | (ihl)) +#ifndef IPPROTO_SCTP +#define IPPROTO_SCTP 132 +#endif + /* TOS fields. */ +#define IP_ECN_NOT_ECT 0x0 +#define IP_ECN_ECT_1 0x01 +#define IP_ECN_ECT_0 0x02 +#define IP_ECN_CE 0x03 #define IP_ECN_MASK 0x03 #define IP_DSCP_MASK 0xfc -#define IP_TYPE_ICMP 1 -#define IP_TYPE_TCP 6 -#define IP_TYPE_UDP 17 - #define IP_VERSION 4 #define IP_DONT_FRAGMENT 0x4000 /* Don't fragment. */ @@ -250,31 +342,43 @@ BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header)); struct ip_header { uint8_t ip_ihl_ver; uint8_t ip_tos; - uint16_t ip_tot_len; - uint16_t ip_id; - uint16_t ip_frag_off; + ovs_be16 ip_tot_len; + ovs_be16 ip_id; + ovs_be16 ip_frag_off; uint8_t ip_ttl; uint8_t ip_proto; - uint16_t ip_csum; - uint32_t ip_src; - uint32_t ip_dst; + ovs_be16 ip_csum; + ovs_be32 ip_src; + ovs_be32 ip_dst; }; BUILD_ASSERT_DECL(IP_HEADER_LEN == sizeof(struct ip_header)); -#define ICMP_HEADER_LEN 4 +#define ICMP_HEADER_LEN 8 struct icmp_header { uint8_t icmp_type; uint8_t icmp_code; - uint16_t icmp_csum; + ovs_be16 icmp_csum; + union { + struct { + ovs_be16 id; + ovs_be16 seq; + } echo; + struct { + ovs_be16 empty; + ovs_be16 mtu; + } frag; + ovs_be32 gateway; + } icmp_fields; + uint8_t icmp_data[0]; }; BUILD_ASSERT_DECL(ICMP_HEADER_LEN == sizeof(struct icmp_header)); #define UDP_HEADER_LEN 8 struct udp_header { - uint16_t udp_src; - uint16_t udp_dst; - uint16_t udp_len; - uint16_t udp_csum; + ovs_be16 udp_src; + ovs_be16 udp_dst; + ovs_be16 udp_len; + ovs_be16 udp_csum; }; BUILD_ASSERT_DECL(UDP_HEADER_LEN == sizeof(struct udp_header)); @@ -285,19 +389,20 @@ BUILD_ASSERT_DECL(UDP_HEADER_LEN == sizeof(struct udp_header)); #define TCP_ACK 0x10 #define TCP_URG 0x20 -#define TCP_FLAGS(tcp_ctl) (htons(tcp_ctl) & 0x003f) -#define TCP_OFFSET(tcp_ctl) (htons(tcp_ctl) >> 12) +#define TCP_CTL(flags, offset) (htons((flags) | ((offset) << 12))) +#define TCP_FLAGS(tcp_ctl) (ntohs(tcp_ctl) & 0x003f) +#define TCP_OFFSET(tcp_ctl) (ntohs(tcp_ctl) >> 12) #define TCP_HEADER_LEN 20 struct tcp_header { - uint16_t tcp_src; - uint16_t tcp_dst; - uint32_t tcp_seq; - uint32_t tcp_ack; - uint16_t tcp_ctl; - uint16_t tcp_winsz; - uint16_t tcp_csum; - uint16_t tcp_urg; + ovs_be16 tcp_src; + ovs_be16 tcp_dst; + ovs_be32 tcp_seq; + ovs_be32 tcp_ack; + ovs_be16 tcp_ctl; + ovs_be16 tcp_winsz; + ovs_be16 tcp_csum; + ovs_be16 tcp_urg; }; BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header)); @@ -305,22 +410,95 @@ BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header)); #define ARP_PRO_IP 0x0800 #define ARP_OP_REQUEST 1 #define ARP_OP_REPLY 2 +#define ARP_OP_RARP 3 #define ARP_ETH_HEADER_LEN 28 struct arp_eth_header { /* Generic members. */ - uint16_t ar_hrd; /* Hardware type. */ - uint16_t ar_pro; /* Protocol type. */ + ovs_be16 ar_hrd; /* Hardware type. */ + ovs_be16 ar_pro; /* Protocol type. */ uint8_t ar_hln; /* Hardware address length. */ uint8_t ar_pln; /* Protocol address length. */ - uint16_t ar_op; /* Opcode. */ + ovs_be16 ar_op; /* Opcode. */ /* Ethernet+IPv4 specific members. */ uint8_t ar_sha[ETH_ADDR_LEN]; /* Sender hardware address. */ - uint32_t ar_spa; /* Sender protocol address. */ + ovs_be32 ar_spa; /* Sender protocol address. */ uint8_t ar_tha[ETH_ADDR_LEN]; /* Target hardware address. */ - uint32_t ar_tpa; /* Target protocol address. */ + ovs_be32 ar_tpa; /* Target protocol address. */ } __attribute__((packed)); BUILD_ASSERT_DECL(ARP_ETH_HEADER_LEN == sizeof(struct arp_eth_header)); +/* The IPv6 flow label is in the lower 20 bits of the first 32-bit word. */ +#define IPV6_LABEL_MASK 0x000fffff + +/* Example: + * + * char *string = "1 ::1 2"; + * char ipv6_s[IPV6_SCAN_LEN + 1]; + * struct in6_addr ipv6; + * + * if (sscanf(string, "%d"IPV6_SCAN_FMT"%d", &a, ipv6_s, &b) == 3 + * && inet_pton(AF_INET6, ipv6_s, &ipv6) == 1) { + * ... + * } + */ +#define IPV6_SCAN_FMT "%46[0123456789abcdefABCDEF:.]" +#define IPV6_SCAN_LEN 46 + +extern const struct in6_addr in6addr_exact; +#define IN6ADDR_EXACT_INIT { { { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, \ + 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff } } } + +static inline bool ipv6_addr_equals(const struct in6_addr *a, + const struct in6_addr *b) +{ +#ifdef IN6_ARE_ADDR_EQUAL + return IN6_ARE_ADDR_EQUAL(a, b); +#else + return !memcmp(a, b, sizeof(*a)); +#endif +} + +static inline bool ipv6_mask_is_any(const struct in6_addr *mask) { + return ipv6_addr_equals(mask, &in6addr_any); +} + +static inline bool ipv6_mask_is_exact(const struct in6_addr *mask) { + return ipv6_addr_equals(mask, &in6addr_exact); +} + +static inline bool is_ip_any(const struct flow *flow) +{ + return flow->dl_type == htons(ETH_TYPE_IP) + || flow->dl_type == htons(ETH_TYPE_IPV6); +} + +void format_ipv6_addr(char *addr_str, const struct in6_addr *addr); +void print_ipv6_addr(struct ds *string, const struct in6_addr *addr); +void print_ipv6_masked(struct ds *string, const struct in6_addr *addr, + const struct in6_addr *mask); +struct in6_addr ipv6_addr_bitand(const struct in6_addr *src, + const struct in6_addr *mask); +struct in6_addr ipv6_create_mask(int mask); +int ipv6_count_cidr_bits(const struct in6_addr *netmask); +bool ipv6_is_cidr(const struct in6_addr *netmask); + +void *eth_compose(struct ofpbuf *, const uint8_t eth_dst[ETH_ADDR_LEN], + const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type, + size_t size); +void *snap_compose(struct ofpbuf *, const uint8_t eth_dst[ETH_ADDR_LEN], + const uint8_t eth_src[ETH_ADDR_LEN], + unsigned int oui, uint16_t snap_type, size_t size); +void packet_set_ipv4(struct ofpbuf *, ovs_be32 src, ovs_be32 dst, uint8_t tos, + uint8_t ttl); +void packet_set_ipv6(struct ofpbuf *, uint8_t proto, const ovs_be32 src[4], + const ovs_be32 dst[4], uint8_t tc, + ovs_be32 fl, uint8_t hlmit); +void packet_set_tcp_port(struct ofpbuf *, ovs_be16 src, ovs_be16 dst); +void packet_set_udp_port(struct ofpbuf *, ovs_be16 src, ovs_be16 dst); + +uint8_t packet_get_tcp_flags(const struct ofpbuf *, const struct flow *); +void packet_format_tcp_flags(struct ds *, uint8_t); + #endif /* packets.h */