675174d4ba
Move netlink routines to their own file, and use netlink to configure or fetch all the information we need, except for the TUNSETIFF ioctl. Move pasta-specific functions to their own file as well, add parameters and calls to configure the tap interface in the namespace. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
void err(const char *format, ...);
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void warn(const char *format, ...);
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void info(const char *format, ...);
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void debug(const char *format, ...);
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#define CHECK_SET_MIN_MAX(basename, fd) \
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do { \
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if ((fd) < basename##min) \
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basename##min = (fd); \
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if ((fd) > basename##max) \
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basename##max = (fd); \
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} while (0)
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#define CHECK_SET_MIN_MAX_PROTO_FD(proto, ipproto, proto_ctx, fd) \
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do { \
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if ((proto) == (ipproto)) \
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CHECK_SET_MIN_MAX(c->proto_ctx.fd_, (fd)); \
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} while (0)
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#ifndef MIN
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#define MIN(x, y) (((x) < (y)) ? (x) : (y))
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#endif
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#ifndef MAX
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#define MAX(x, y) (((x) > (y)) ? (x) : (y))
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#endif
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#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
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#define ROUND_DOWN(x, y) ((x) & ~((y) - 1))
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#define SWAP(a, b) \
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do { \
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typeof(a) __x = (a); (a) = (b); (b) = __x; \
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} while (0) \
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#define STRINGIFY(x) #x
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#define STR(x) STRINGIFY(x)
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#define V4 0
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#define V6 1
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#define IP_VERSIONS 2
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enum {
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IP_VERSION_DISABLED = 0,
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IP_VERSION_ENABLED,
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IP_VERSION_PROBE,
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};
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#define ARRAY_SIZE(a) ((int)(sizeof(a) / sizeof((a)[0])))
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#define IN_INTERVAL(a, b, x) ((x) >= (a) && (x) <= (b))
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#define FD_PROTO(x, proto) \
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(IN_INTERVAL(c->proto.fd_min, c->proto.fd_max, (x)))
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#define PORT_EPHEMERAL_MIN ((1 << 15) + (1 << 14)) /* RFC 6335 */
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#define PORT_IS_EPHEMERAL(port) ((port) >= PORT_EPHEMERAL_MIN)
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#define MAC_ZERO ((uint8_t [ETH_ALEN]){ 0 })
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#define MAC_IS_ZERO(addr) (!memcmp((addr), MAC_ZERO, ETH_ALEN))
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#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 4)
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#define NS_CALL(fn, arg) \
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do { \
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char ns_fn_stack[NS_FN_STACK_SIZE]; \
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\
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clone((fn), ns_fn_stack + sizeof(ns_fn_stack) / 2, \
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CLONE_VM | CLONE_VFORK | CLONE_FILES | SIGCHLD, \
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(void *)(arg)); \
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} while (0)
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define L2_BUF_ETH_IP4_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = ETH_P_IP, \
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}
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#else
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#define L2_BUF_ETH_IP4_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = __bswap_constant_16(ETH_P_IP), \
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}
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#endif
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define L2_BUF_ETH_IP6_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = ETH_P_IPV6, \
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}
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#else
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#define L2_BUF_ETH_IP6_INIT \
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{ \
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.h_dest = { 0 }, \
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.h_source = { 0 }, \
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.h_proto = __bswap_constant_16(ETH_P_IPV6), \
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}
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#endif
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#define L2_BUF_IP4_INIT(proto) \
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{ \
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.version = 4, \
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.ihl = 5, \
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.tos = 0, \
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.tot_len = 0, \
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.id = 0, \
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.frag_off = 0, \
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.ttl = 255, \
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.protocol = (proto), \
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.saddr = 0, \
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.daddr = 0, \
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}
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#define L2_BUF_IP6_INIT(proto) \
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{ \
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.priority = 0, \
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.version = 6, \
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.flow_lbl = { 0 }, \
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.payload_len = 0, \
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.nexthdr = (proto), \
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.hop_limit = 255, \
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.saddr = IN6ADDR_ANY_INIT, \
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.daddr = IN6ADDR_ANY_INIT, \
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}
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#define RCVBUF_BIG (2 * 1024 * 1024)
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#define SNDBUF_BIG (4 * 1024 * 1024)
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#define SNDBUF_SMALL (128 * 1024)
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#include <linux/ipv6.h>
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#include <net/if.h>
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#include <linux/ip.h>
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#include <limits.h>
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enum bind_type {
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BIND_ANY = 0,
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BIND_LOOPBACK,
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BIND_LL,
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BIND_EXT,
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};
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struct ctx;
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char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto);
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int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port,
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enum bind_type bind_addr, uint32_t data);
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void sock_probe_mem(struct ctx *c);
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int timespec_diff_ms(struct timespec *a, struct timespec *b);
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void bitmap_set(uint8_t *map, int bit);
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void bitmap_clear(uint8_t *map, int bit);
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int bitmap_isset(uint8_t *map, int bit);
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void procfs_scan_listen(char *name, uint8_t *map, uint8_t *exclude);
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int ns_enter(struct ctx *c);
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