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Add option to disable IPv6 to speed up performance of XDP program.

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This commit is contained in:
Christian Deacon
2025-03-25 11:25:15 -04:00
parent 2c9312c574
commit 2060f41081
8 changed files with 205 additions and 166 deletions
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341
src/xdp/prog.c
View File

@@ -46,7 +46,11 @@ int xdp_prog_main(struct xdp_md *ctx)
}
// Check Ethernet protocol.
#ifdef ENABLE_IPV6
if (unlikely(eth->h_proto != htons(ETH_P_IP) && eth->h_proto != htons(ETH_P_IPV6)))
#else
if (unlikely(eth->h_proto != htons(ETH_P_IP)))
#endif
{
inc_pkt_stats(stats, STATS_TYPE_PASSED);
@@ -59,7 +63,19 @@ int xdp_prog_main(struct xdp_md *ctx)
u128 src_ip6 = 0;
// Set IPv4 and IPv6 common variables.
if (eth->h_proto == htons(ETH_P_IPV6))
if (eth->h_proto == htons(ETH_P_IP))
{
iph = data + sizeof(struct ethhdr);
if (unlikely(iph + 1 > (struct iphdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
}
#ifdef ENABLE_IPV6
else
{
iph6 = data + sizeof(struct ethhdr);
@@ -72,17 +88,7 @@ int xdp_prog_main(struct xdp_md *ctx)
memcpy(&src_ip6, iph6->saddr.in6_u.u6_addr32, sizeof(src_ip6));
}
else
{
iph = data + sizeof(struct ethhdr);
if (unlikely(iph + 1 > (struct iphdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
}
#endif
// We only want to process TCP, UDP, and ICMP packets.
if ((iph6 && iph6->nexthdr != IPPROTO_UDP && iph6->nexthdr != IPPROTO_TCP && iph6->nexthdr != IPPROTO_ICMP) && (iph && iph->protocol != IPPROTO_UDP && iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_ICMP))
@@ -98,28 +104,32 @@ int xdp_prog_main(struct xdp_md *ctx)
// Check block map.
u64 *blocked = NULL;
if (iph6)
{
blocked = bpf_map_lookup_elem(&map_block6, &src_ip6);
}
else if (iph)
if (iph)
{
blocked = bpf_map_lookup_elem(&map_block, &iph->saddr);
}
#ifdef ENABLE_IPV6
else
{
blocked = bpf_map_lookup_elem(&map_block6, &src_ip6);
}
#endif
if (blocked != NULL)
{
if (*blocked > 0 && now > *blocked)
{
// Remove element from map.
if (iph6)
{
bpf_map_delete_elem(&map_block6, &src_ip6);
}
else if (iph)
if (iph)
{
bpf_map_delete_elem(&map_block, &iph->saddr);
}
#ifdef ENABLE_IPV6
else
{
bpf_map_delete_elem(&map_block6, &src_ip6);
}
#endif
}
else
{
@@ -162,68 +172,7 @@ int xdp_prog_main(struct xdp_md *ctx)
u8 protocol = 0;
if (iph6)
{
protocol = iph6->nexthdr;
switch (iph6->nexthdr)
{
case IPPROTO_TCP:
// Scan TCP header.
tcph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
// Check TCP header.
if (unlikely(tcph + 1 > (struct tcphdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
src_port = tcph->source;
#ifdef ENABLE_FILTER_LOGGING
dst_port = tcph->dest;
#endif
break;
case IPPROTO_UDP:
// Scan UDP header.
udph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
// Check TCP header.
if (unlikely(udph + 1 > (struct udphdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
src_port = udph->source;
#ifdef ENABLE_FILTER_LOGGING
dst_port = udph->dest;
#endif
break;
case IPPROTO_ICMPV6:
// Scan ICMPv6 header.
icmp6h = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
// Check ICMPv6 header.
if (unlikely(icmp6h + 1 > (struct icmp6hdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
break;
}
}
else if (iph)
if (iph)
{
protocol = iph->protocol;
@@ -284,6 +233,69 @@ int xdp_prog_main(struct xdp_md *ctx)
break;
}
}
#ifdef ENABLE_IPV6
else if (iph6)
{
protocol = iph6->nexthdr;
switch (iph6->nexthdr)
{
case IPPROTO_TCP:
// Scan TCP header.
tcph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
// Check TCP header.
if (unlikely(tcph + 1 > (struct tcphdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
src_port = tcph->source;
#ifdef ENABLE_FILTER_LOGGING
dst_port = tcph->dest;
#endif
break;
case IPPROTO_UDP:
// Scan UDP header.
udph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
// Check TCP header.
if (unlikely(udph + 1 > (struct udphdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
src_port = udph->source;
#ifdef ENABLE_FILTER_LOGGING
dst_port = udph->dest;
#endif
break;
case IPPROTO_ICMPV6:
// Scan ICMPv6 header.
icmp6h = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
// Check ICMPv6 header.
if (unlikely(icmp6h + 1 > (struct icmp6hdr *)data_end))
{
inc_pkt_stats(stats, STATS_TYPE_DROPPED);
return XDP_DROP;
}
break;
}
}
#endif
#ifdef ENABLE_FILTERS
// Update client stats (PPS/BPS).
@@ -304,6 +316,7 @@ int xdp_prog_main(struct xdp_md *ctx)
update_flow_stats(&flow_pps, &flow_bps, iph->saddr, src_port, protocol, pkt_len, now);
#endif
}
#ifdef ENABLE_IPV6
else if (iph6)
{
#ifdef ENABLE_RL_IP
@@ -315,6 +328,7 @@ int xdp_prog_main(struct xdp_md *ctx)
#endif
}
#endif
#endif
#endif
int action = 0;
@@ -358,8 +372,76 @@ int xdp_prog_main(struct xdp_md *ctx)
}
#endif
// Do specific IPv6.
if (iph6)
// Match IP settings.
if (iph)
{
// Source address.
if (filter->ip.src_ip)
{
if (filter->ip.src_cidr == 32 && iph->saddr != filter->ip.src_ip)
{
continue;
}
if (!is_ip_in_range(iph->saddr, filter->ip.src_ip, filter->ip.src_cidr))
{
continue;
}
}
// Destination address.
if (filter->ip.dst_ip)
{
if (filter->ip.dst_cidr == 32 && iph->daddr != filter->ip.dst_ip)
{
continue;
}
if (!is_ip_in_range(iph->daddr, filter->ip.dst_ip, filter->ip.dst_cidr))
{
continue;
}
}
#if defined(ENABLE_IPV6) && defined(ALLOW_SINGLE_IP_V4_V6)
if ((filter->ip.src_ip6[0] != 0 || filter->ip.src_ip6[1] != 0 || filter->ip.src_ip6[2] != 0 || filter->ip.src_ip6[3] != 0) || (filter->ip.dst_ip6[0] != 0 || filter->ip.dst_ip6[1] != 0 || filter->ip.dst_ip6[2] != 0 || filter->ip.dst_ip6[3] != 0))
{
continue;
}
#endif
// TOS.
if (filter->ip.do_tos && filter->ip.tos != iph->tos)
{
continue;
}
// Max TTL.
if (filter->ip.do_max_ttl && filter->ip.max_ttl < iph->ttl)
{
continue;
}
// Min TTL.
if (filter->ip.do_min_ttl && filter->ip.min_ttl > iph->ttl)
{
continue;
}
// Max packet length.
if (filter->ip.do_max_len && filter->ip.max_len < pkt_len)
{
continue;
}
// Min packet length.
if (filter->ip.do_min_len && filter->ip.min_len > pkt_len)
{
continue;
}
}
#ifdef ENABLE_IPV6
else if (iph6)
{
// Source address.
if (filter->ip.src_ip6[0] != 0 && (iph6->saddr.in6_u.u6_addr32[0] != filter->ip.src_ip6[0] || iph6->saddr.in6_u.u6_addr32[1] != filter->ip.src_ip6[1] || iph6->saddr.in6_u.u6_addr32[2] != filter->ip.src_ip6[2] || iph6->saddr.in6_u.u6_addr32[3] != filter->ip.src_ip6[3]))
@@ -404,75 +486,9 @@ int xdp_prog_main(struct xdp_md *ctx)
continue;
}
}
else if (iph)
{
// Source address.
if (filter->ip.src_ip)
{
if (filter->ip.src_cidr == 32 && iph->saddr != filter->ip.src_ip)
{
continue;
}
if (!is_ip_in_range(iph->saddr, filter->ip.src_ip, filter->ip.src_cidr))
{
continue;
}
}
// Destination address.
if (filter->ip.dst_ip)
{
if (filter->ip.dst_cidr == 32 && iph->daddr != filter->ip.dst_ip)
{
continue;
}
if (!is_ip_in_range(iph->daddr, filter->ip.dst_ip, filter->ip.dst_cidr))
{
continue;
}
}
#ifdef ALLOW_SINGLE_IP_V4_V6
if ((filter->ip.src_ip6[0] != 0 || filter->ip.src_ip6[1] != 0 || filter->ip.src_ip6[2] != 0 || filter->ip.src_ip6[3] != 0) || (filter->ip.dst_ip6[0] != 0 || filter->ip.dst_ip6[1] != 0 || filter->ip.dst_ip6[2] != 0 || filter->ip.dst_ip6[3] != 0))
{
continue;
}
#endif
// TOS.
if (filter->ip.do_tos && filter->ip.tos != iph->tos)
{
continue;
}
// Max TTL.
if (filter->ip.do_max_ttl && filter->ip.max_ttl < iph->ttl)
{
continue;
}
// Min TTL.
if (filter->ip.do_min_ttl && filter->ip.min_ttl > iph->ttl)
{
continue;
}
// Max packet length.
if (filter->ip.do_max_len && filter->ip.max_len < pkt_len)
{
continue;
}
// Min packet length.
if (filter->ip.do_min_len && filter->ip.min_len > pkt_len)
{
continue;
}
}
// Do TCP options.
// Check TCP matches.
if (filter->tcp.enabled)
{
if (!tcph)
@@ -550,6 +566,7 @@ int xdp_prog_main(struct xdp_md *ctx)
continue;
}
}
// Check UDP matches.
else if (filter->udp.enabled)
{
if (!udph)
@@ -595,6 +612,7 @@ int xdp_prog_main(struct xdp_md *ctx)
continue;
}
}
#ifdef ENABLE_IPV6
else if (icmp6h)
{
// Code.
@@ -609,10 +627,7 @@ int xdp_prog_main(struct xdp_md *ctx)
continue;
}
}
else
{
continue;
}
#endif
}
#ifdef ENABLE_FILTER_LOGGING
@@ -643,14 +658,16 @@ matched:
{
u64 new_time = now + (block_time * NANO_TO_SEC);
if (iph6)
{
bpf_map_update_elem(&map_block6, &src_ip6, &new_time, BPF_ANY);
}
else if (iph)
if (iph)
{
bpf_map_update_elem(&map_block, &iph->saddr, &new_time, BPF_ANY);
}
#ifdef ENABLE_IPV6
else
{
bpf_map_update_elem(&map_block6, &src_ip6, &new_time, BPF_ANY);
}
#endif
}
inc_pkt_stats(stats, STATS_TYPE_DROPPED);

5
src/xdp/utils/logging.c
View File

@@ -36,11 +36,14 @@ static __always_inline int log_filter_msg(struct iphdr* iph, struct ipv6hdr* iph
{
e->src_ip = iph->saddr;
e->dst_ip = iph->daddr;
} else if (iph6)
}
#ifdef ENABLE_IPV6
else if (iph6)
{
memcpy(&e->src_ip6, iph6->saddr.in6_u.u6_addr32, 4);
memcpy(&e->dst_ip6, iph6->daddr.in6_u.u6_addr32, 4);
}
#endif
e->src_port = src_port;
e->dst_port = dst_port;

6
src/xdp/utils/maps.h
View File

@@ -21,6 +21,7 @@ struct
__type(value, u64);
} map_block SEC(".maps");
#ifdef ENABLE_IPV6
struct
{
__uint(type, BPF_MAP_TYPE_LRU_HASH);
@@ -28,6 +29,7 @@ struct
__type(key, u128);
__type(value, u64);
} map_block6 SEC(".maps");
#endif
#ifdef ENABLE_IP_RANGE_DROP
struct
@@ -50,6 +52,7 @@ struct
__type(value, cl_stats_t);
} map_ip_stats SEC(".maps");
#ifdef ENABLE_IPV6
struct
{
__uint(type, BPF_MAP_TYPE_LRU_HASH);
@@ -58,6 +61,7 @@ struct
__type(value, cl_stats_t);
} map_ip6_stats SEC(".maps");
#endif
#endif
#ifdef ENABLE_RL_FLOW
struct
@@ -68,6 +72,7 @@ struct
__type(value, cl_stats_t);
} map_flow_stats SEC(".maps");
#ifdef ENABLE_IPV6
struct
{
__uint(type, BPF_MAP_TYPE_LRU_HASH);
@@ -76,6 +81,7 @@ struct
__type(value, cl_stats_t);
} map_flow6_stats SEC(".maps");
#endif
#endif
struct
{

4
src/xdp/utils/rl.c
View File

@@ -55,6 +55,7 @@ static __always_inline int update_ip_stats(u64 *pps, u64 *bps, u32 ip, u16 pkt_l
return 0;
}
#ifdef ENABLE_IPV6
/**
* Updates source IPv6 address stats.
*
@@ -107,6 +108,7 @@ static __always_inline int update_ip6_stats(u64 *pps, u64 *bps, u128 *ip, u16 pk
return 0;
}
#endif
#endif
#ifdef ENABLE_RL_FLOW
/**
@@ -168,6 +170,7 @@ static __always_inline int update_flow_stats(u64 *pps, u64 *bps, u32 ip, u16 por
return 0;
}
#ifdef ENABLE_IPV6
/**
* Updates IPv6 flow stats.
*
@@ -227,4 +230,5 @@ static __always_inline int update_flow6_stats(u64 *pps, u64 *bps, u128 *ip, u16
return 0;
}
#endif
#endif
#endif